[SCSI] pmcraid: PMC-Sierra MaxRAID driver to support 6Gb/s SAS RAID controller
Signed-off-by: Anil Ravindranath <anil_ravindranath@pmc-sierra.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
diff --git a/drivers/scsi/pmcraid.c b/drivers/scsi/pmcraid.c
new file mode 100644
index 0000000..4302f06
--- /dev/null
+++ b/drivers/scsi/pmcraid.c
@@ -0,0 +1,5604 @@
+/*
+ * pmcraid.c -- driver for PMC Sierra MaxRAID controller adapters
+ *
+ * Written By: PMC Sierra Corporation
+ *
+ * Copyright (C) 2008, 2009 PMC Sierra Inc
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307,
+ * USA
+ *
+ */
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/pci.h>
+#include <linux/wait.h>
+#include <linux/spinlock.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/blkdev.h>
+#include <linux/firmware.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/hdreg.h>
+#include <linux/version.h>
+#include <linux/io.h>
+#include <asm/irq.h>
+#include <asm/processor.h>
+#include <linux/libata.h>
+#include <linux/mutex.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_tcq.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsicam.h>
+
+#include "pmcraid.h"
+
+/*
+ * Module configuration parameters
+ */
+static unsigned int pmcraid_debug_log;
+static unsigned int pmcraid_disable_aen;
+static unsigned int pmcraid_log_level = IOASC_LOG_LEVEL_MUST;
+
+/*
+ * Data structures to support multiple adapters by the LLD.
+ * pmcraid_adapter_count - count of configured adapters
+ */
+static atomic_t pmcraid_adapter_count = ATOMIC_INIT(0);
+
+/*
+ * Supporting user-level control interface through IOCTL commands.
+ * pmcraid_major - major number to use
+ * pmcraid_minor - minor number(s) to use
+ */
+static unsigned int pmcraid_major;
+static struct class *pmcraid_class;
+DECLARE_BITMAP(pmcraid_minor, PMCRAID_MAX_ADAPTERS);
+
+/*
+ * Module parameters
+ */
+MODULE_AUTHOR("PMC Sierra Corporation, anil_ravindranath@pmc-sierra.com");
+MODULE_DESCRIPTION("PMC Sierra MaxRAID Controller Driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(PMCRAID_DRIVER_VERSION);
+
+module_param_named(log_level, pmcraid_log_level, uint, (S_IRUGO | S_IWUSR));
+MODULE_PARM_DESC(log_level,
+ "Enables firmware error code logging, default :1 high-severity"
+ " errors, 2: all errors including high-severity errors,"
+ " 0: disables logging");
+
+module_param_named(debug, pmcraid_debug_log, uint, (S_IRUGO | S_IWUSR));
+MODULE_PARM_DESC(debug,
+ "Enable driver verbose message logging. Set 1 to enable."
+ "(default: 0)");
+
+module_param_named(disable_aen, pmcraid_disable_aen, uint, (S_IRUGO | S_IWUSR));
+MODULE_PARM_DESC(disable_aen,
+ "Disable driver aen notifications to apps. Set 1 to disable."
+ "(default: 0)");
+
+/* chip specific constants for PMC MaxRAID controllers (same for
+ * 0x5220 and 0x8010
+ */
+static struct pmcraid_chip_details pmcraid_chip_cfg[] = {
+ {
+ .ioastatus = 0x0,
+ .ioarrin = 0x00040,
+ .mailbox = 0x7FC30,
+ .global_intr_mask = 0x00034,
+ .ioa_host_intr = 0x0009C,
+ .ioa_host_intr_clr = 0x000A0,
+ .ioa_host_mask = 0x7FC28,
+ .ioa_host_mask_clr = 0x7FC28,
+ .host_ioa_intr = 0x00020,
+ .host_ioa_intr_clr = 0x00020,
+ .transop_timeout = 300
+ }
+};
+
+/*
+ * PCI device ids supported by pmcraid driver
+ */
+static struct pci_device_id pmcraid_pci_table[] __devinitdata = {
+ { PCI_DEVICE(PCI_VENDOR_ID_PMC, PCI_DEVICE_ID_PMC_MAXRAID),
+ 0, 0, (kernel_ulong_t)&pmcraid_chip_cfg[0]
+ },
+ {}
+};
+
+MODULE_DEVICE_TABLE(pci, pmcraid_pci_table);
+
+
+
+/**
+ * pmcraid_slave_alloc - Prepare for commands to a device
+ * @scsi_dev: scsi device struct
+ *
+ * This function is called by mid-layer prior to sending any command to the new
+ * device. Stores resource entry details of the device in scsi_device struct.
+ * Queuecommand uses the resource handle and other details to fill up IOARCB
+ * while sending commands to the device.
+ *
+ * Return value:
+ * 0 on success / -ENXIO if device does not exist
+ */
+static int pmcraid_slave_alloc(struct scsi_device *scsi_dev)
+{
+ struct pmcraid_resource_entry *temp, *res = NULL;
+ struct pmcraid_instance *pinstance;
+ u8 target, bus, lun;
+ unsigned long lock_flags;
+ int rc = -ENXIO;
+ pinstance = shost_priv(scsi_dev->host);
+
+ /* Driver exposes VSET and GSCSI resources only; all other device types
+ * are not exposed. Resource list is synchronized using resource lock
+ * so any traversal or modifications to the list should be done inside
+ * this lock
+ */
+ spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
+ list_for_each_entry(temp, &pinstance->used_res_q, queue) {
+
+ /* do not expose VSETs with order-ids >= 240 */
+ if (RES_IS_VSET(temp->cfg_entry)) {
+ target = temp->cfg_entry.unique_flags1;
+ if (target >= PMCRAID_MAX_VSET_TARGETS)
+ continue;
+ bus = PMCRAID_VSET_BUS_ID;
+ lun = 0;
+ } else if (RES_IS_GSCSI(temp->cfg_entry)) {
+ target = RES_TARGET(temp->cfg_entry.resource_address);
+ bus = PMCRAID_PHYS_BUS_ID;
+ lun = RES_LUN(temp->cfg_entry.resource_address);
+ } else {
+ continue;
+ }
+
+ if (bus == scsi_dev->channel &&
+ target == scsi_dev->id &&
+ lun == scsi_dev->lun) {
+ res = temp;
+ break;
+ }
+ }
+
+ if (res) {
+ res->scsi_dev = scsi_dev;
+ scsi_dev->hostdata = res;
+ res->change_detected = 0;
+ atomic_set(&res->read_failures, 0);
+ atomic_set(&res->write_failures, 0);
+ rc = 0;
+ }
+ spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
+ return rc;
+}
+
+/**
+ * pmcraid_slave_configure - Configures a SCSI device
+ * @scsi_dev: scsi device struct
+ *
+ * This fucntion is executed by SCSI mid layer just after a device is first
+ * scanned (i.e. it has responded to an INQUIRY). For VSET resources, the
+ * timeout value (default 30s) will be over-written to a higher value (60s)
+ * and max_sectors value will be over-written to 512. It also sets queue depth
+ * to host->cmd_per_lun value
+ *
+ * Return value:
+ * 0 on success
+ */
+static int pmcraid_slave_configure(struct scsi_device *scsi_dev)
+{
+ struct pmcraid_resource_entry *res = scsi_dev->hostdata;
+
+ if (!res)
+ return 0;
+
+ /* LLD exposes VSETs and Enclosure devices only */
+ if (RES_IS_GSCSI(res->cfg_entry) &&
+ scsi_dev->type != TYPE_ENCLOSURE)
+ return -ENXIO;
+
+ pmcraid_info("configuring %x:%x:%x:%x\n",
+ scsi_dev->host->unique_id,
+ scsi_dev->channel,
+ scsi_dev->id,
+ scsi_dev->lun);
+
+ if (RES_IS_GSCSI(res->cfg_entry)) {
+ scsi_dev->allow_restart = 1;
+ } else if (RES_IS_VSET(res->cfg_entry)) {
+ scsi_dev->allow_restart = 1;
+ blk_queue_rq_timeout(scsi_dev->request_queue,
+ PMCRAID_VSET_IO_TIMEOUT);
+ blk_queue_max_sectors(scsi_dev->request_queue,
+ PMCRAID_VSET_MAX_SECTORS);
+ }
+
+ if (scsi_dev->tagged_supported &&
+ (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry))) {
+ scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
+ scsi_adjust_queue_depth(scsi_dev, MSG_SIMPLE_TAG,
+ scsi_dev->host->cmd_per_lun);
+ } else {
+ scsi_adjust_queue_depth(scsi_dev, 0,
+ scsi_dev->host->cmd_per_lun);
+ }
+
+ return 0;
+}
+
+/**
+ * pmcraid_slave_destroy - Unconfigure a SCSI device before removing it
+ *
+ * @scsi_dev: scsi device struct
+ *
+ * This is called by mid-layer before removing a device. Pointer assignments
+ * done in pmcraid_slave_alloc will be reset to NULL here.
+ *
+ * Return value
+ * none
+ */
+static void pmcraid_slave_destroy(struct scsi_device *scsi_dev)
+{
+ struct pmcraid_resource_entry *res;
+
+ res = (struct pmcraid_resource_entry *)scsi_dev->hostdata;
+
+ if (res)
+ res->scsi_dev = NULL;
+
+ scsi_dev->hostdata = NULL;
+}
+
+/**
+ * pmcraid_change_queue_depth - Change the device's queue depth
+ * @scsi_dev: scsi device struct
+ * @depth: depth to set
+ *
+ * Return value
+ * actual depth set
+ */
+static int pmcraid_change_queue_depth(struct scsi_device *scsi_dev, int depth)
+{
+ if (depth > PMCRAID_MAX_CMD_PER_LUN)
+ depth = PMCRAID_MAX_CMD_PER_LUN;
+
+ scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev), depth);
+
+ return scsi_dev->queue_depth;
+}
+
+/**
+ * pmcraid_change_queue_type - Change the device's queue type
+ * @scsi_dev: scsi device struct
+ * @tag: type of tags to use
+ *
+ * Return value:
+ * actual queue type set
+ */
+static int pmcraid_change_queue_type(struct scsi_device *scsi_dev, int tag)
+{
+ struct pmcraid_resource_entry *res;
+
+ res = (struct pmcraid_resource_entry *)scsi_dev->hostdata;
+
+ if ((res) && scsi_dev->tagged_supported &&
+ (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry))) {
+ scsi_set_tag_type(scsi_dev, tag);
+
+ if (tag)
+ scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
+ else
+ scsi_deactivate_tcq(scsi_dev, scsi_dev->queue_depth);
+ } else
+ tag = 0;
+
+ return tag;
+}
+
+
+/**
+ * pmcraid_init_cmdblk - initializes a command block
+ *
+ * @cmd: pointer to struct pmcraid_cmd to be initialized
+ * @index: if >=0 first time initialization; otherwise reinitialization
+ *
+ * Return Value
+ * None
+ */
+void pmcraid_init_cmdblk(struct pmcraid_cmd *cmd, int index)
+{
+ struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb);
+ dma_addr_t dma_addr = cmd->ioa_cb_bus_addr;
+
+ if (index >= 0) {
+ /* first time initialization (called from probe) */
+ u32 ioasa_offset =
+ offsetof(struct pmcraid_control_block, ioasa);
+
+ cmd->index = index;
+ ioarcb->response_handle = cpu_to_le32(index << 2);
+ ioarcb->ioarcb_bus_addr = cpu_to_le64(dma_addr);
+ ioarcb->ioasa_bus_addr = cpu_to_le64(dma_addr + ioasa_offset);
+ ioarcb->ioasa_len = cpu_to_le16(sizeof(struct pmcraid_ioasa));
+ } else {
+ /* re-initialization of various lengths, called once command is
+ * processed by IOA
+ */
+ memset(&cmd->ioa_cb->ioarcb.cdb, 0, PMCRAID_MAX_CDB_LEN);
+ ioarcb->request_flags0 = 0;
+ ioarcb->request_flags1 = 0;
+ ioarcb->cmd_timeout = 0;
+ ioarcb->ioarcb_bus_addr &= (~0x1FULL);
+ ioarcb->ioadl_bus_addr = 0;
+ ioarcb->ioadl_length = 0;
+ ioarcb->data_transfer_length = 0;
+ ioarcb->add_cmd_param_length = 0;
+ ioarcb->add_cmd_param_offset = 0;
+ cmd->ioa_cb->ioasa.ioasc = 0;
+ cmd->ioa_cb->ioasa.residual_data_length = 0;
+ cmd->u.time_left = 0;
+ }
+
+ cmd->cmd_done = NULL;
+ cmd->scsi_cmd = NULL;
+ cmd->release = 0;
+ cmd->completion_req = 0;
+ cmd->dma_handle = 0;
+ init_timer(&cmd->timer);
+}
+
+/**
+ * pmcraid_reinit_cmdblk - reinitialize a command block
+ *
+ * @cmd: pointer to struct pmcraid_cmd to be reinitialized
+ *
+ * Return Value
+ * None
+ */
+static void pmcraid_reinit_cmdblk(struct pmcraid_cmd *cmd)
+{
+ pmcraid_init_cmdblk(cmd, -1);
+}
+
+/**
+ * pmcraid_get_free_cmd - get a free cmd block from command block pool
+ * @pinstance: adapter instance structure
+ *
+ * Return Value:
+ * returns pointer to cmd block or NULL if no blocks are available
+ */
+static struct pmcraid_cmd *pmcraid_get_free_cmd(
+ struct pmcraid_instance *pinstance
+)
+{
+ struct pmcraid_cmd *cmd = NULL;
+ unsigned long lock_flags;
+
+ /* free cmd block list is protected by free_pool_lock */
+ spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags);
+
+ if (!list_empty(&pinstance->free_cmd_pool)) {
+ cmd = list_entry(pinstance->free_cmd_pool.next,
+ struct pmcraid_cmd, free_list);
+ list_del(&cmd->free_list);
+ }
+ spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags);
+
+ /* Initialize the command block before giving it the caller */
+ if (cmd != NULL)
+ pmcraid_reinit_cmdblk(cmd);
+ return cmd;
+}
+
+/**
+ * pmcraid_return_cmd - return a completed command block back into free pool
+ * @cmd: pointer to the command block
+ *
+ * Return Value:
+ * nothing
+ */
+void pmcraid_return_cmd(struct pmcraid_cmd *cmd)
+{
+ struct pmcraid_instance *pinstance = cmd->drv_inst;
+ unsigned long lock_flags;
+
+ spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags);
+ list_add_tail(&cmd->free_list, &pinstance->free_cmd_pool);
+ spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags);
+}
+
+/**
+ * pmcraid_read_interrupts - reads IOA interrupts
+ *
+ * @pinstance: pointer to adapter instance structure
+ *
+ * Return value
+ * interrupts read from IOA
+ */
+static u32 pmcraid_read_interrupts(struct pmcraid_instance *pinstance)
+{
+ return ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
+}
+
+/**
+ * pmcraid_disable_interrupts - Masks and clears all specified interrupts
+ *
+ * @pinstance: pointer to per adapter instance structure
+ * @intrs: interrupts to disable
+ *
+ * Return Value
+ * None
+ */
+static void pmcraid_disable_interrupts(
+ struct pmcraid_instance *pinstance,
+ u32 intrs
+)
+{
+ u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg);
+ u32 nmask = gmask | GLOBAL_INTERRUPT_MASK;
+
+ iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg);
+ iowrite32(intrs, pinstance->int_regs.ioa_host_interrupt_clr_reg);
+ iowrite32(intrs, pinstance->int_regs.ioa_host_interrupt_mask_reg);
+ ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
+}
+
+/**
+ * pmcraid_enable_interrupts - Enables specified interrupts
+ *
+ * @pinstance: pointer to per adapter instance structure
+ * @intr: interrupts to enable
+ *
+ * Return Value
+ * None
+ */
+static void pmcraid_enable_interrupts(
+ struct pmcraid_instance *pinstance,
+ u32 intrs
+)
+{
+ u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg);
+ u32 nmask = gmask & (~GLOBAL_INTERRUPT_MASK);
+
+ iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg);
+ iowrite32(~intrs, pinstance->int_regs.ioa_host_interrupt_mask_reg);
+ ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
+
+ pmcraid_info("enabled interrupts global mask = %x intr_mask = %x\n",
+ ioread32(pinstance->int_regs.global_interrupt_mask_reg),
+ ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg));
+}
+
+/**
+ * pmcraid_reset_type - Determine the required reset type
+ * @pinstance: pointer to adapter instance structure
+ *
+ * IOA requires hard reset if any of the following conditions is true.
+ * 1. If HRRQ valid interrupt is not masked
+ * 2. IOA reset alert doorbell is set
+ * 3. If there are any error interrupts
+ */
+static void pmcraid_reset_type(struct pmcraid_instance *pinstance)
+{
+ u32 mask;
+ u32 intrs;
+ u32 alerts;
+
+ mask = ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
+ intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
+ alerts = ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
+
+ if ((mask & INTRS_HRRQ_VALID) == 0 ||
+ (alerts & DOORBELL_IOA_RESET_ALERT) ||
+ (intrs & PMCRAID_ERROR_INTERRUPTS)) {
+ pmcraid_info("IOA requires hard reset\n");
+ pinstance->ioa_hard_reset = 1;
+ }
+
+ /* If unit check is active, trigger the dump */
+ if (intrs & INTRS_IOA_UNIT_CHECK)
+ pinstance->ioa_unit_check = 1;
+}
+
+/**
+ * pmcraid_bist_done - completion function for PCI BIST
+ * @cmd: pointer to reset command
+ * Return Value
+ * none
+ */
+
+static void pmcraid_ioa_reset(struct pmcraid_cmd *);
+
+static void pmcraid_bist_done(struct pmcraid_cmd *cmd)
+{
+ struct pmcraid_instance *pinstance = cmd->drv_inst;
+ unsigned long lock_flags;
+ int rc;
+ u16 pci_reg;
+
+ rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);
+
+ /* If PCI config space can't be accessed wait for another two secs */
+ if ((rc != PCIBIOS_SUCCESSFUL || (!(pci_reg & PCI_COMMAND_MEMORY))) &&
+ cmd->u.time_left > 0) {
+ pmcraid_info("BIST not complete, waiting another 2 secs\n");
+ cmd->timer.expires = jiffies + cmd->u.time_left;
+ cmd->u.time_left = 0;
+ cmd->timer.data = (unsigned long)cmd;
+ cmd->timer.function =
+ (void (*)(unsigned long))pmcraid_bist_done;
+ add_timer(&cmd->timer);
+ } else {
+ cmd->u.time_left = 0;
+ pmcraid_info("BIST is complete, proceeding with reset\n");
+ spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
+ pmcraid_ioa_reset(cmd);
+ spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
+ }
+}
+
+/**
+ * pmcraid_start_bist - starts BIST
+ * @cmd: pointer to reset cmd
+ * Return Value
+ * none
+ */
+static void pmcraid_start_bist(struct pmcraid_cmd *cmd)
+{
+ struct pmcraid_instance *pinstance = cmd->drv_inst;
+ u32 doorbells, intrs;
+
+ /* proceed with bist and wait for 2 seconds */
+ iowrite32(DOORBELL_IOA_START_BIST,
+ pinstance->int_regs.host_ioa_interrupt_reg);
+ doorbells = ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
+ intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
+ pmcraid_info("doorbells after start bist: %x intrs: %x \n",
+ doorbells, intrs);
+
+ cmd->u.time_left = msecs_to_jiffies(PMCRAID_BIST_TIMEOUT);
+ cmd->timer.data = (unsigned long)cmd;
+ cmd->timer.expires = jiffies + msecs_to_jiffies(PMCRAID_BIST_TIMEOUT);
+ cmd->timer.function = (void (*)(unsigned long))pmcraid_bist_done;
+ add_timer(&cmd->timer);
+}
+
+/**
+ * pmcraid_reset_alert_done - completion routine for reset_alert
+ * @cmd: pointer to command block used in reset sequence
+ * Return value
+ * None
+ */
+static void pmcraid_reset_alert_done(struct pmcraid_cmd *cmd)
+{
+ struct pmcraid_instance *pinstance = cmd->drv_inst;
+ u32 status = ioread32(pinstance->ioa_status);
+ unsigned long lock_flags;
+
+ /* if the critical operation in progress bit is set or the wait times
+ * out, invoke reset engine to proceed with hard reset. If there is
+ * some more time to wait, restart the timer
+ */
+ if (((status & INTRS_CRITICAL_OP_IN_PROGRESS) == 0) ||
+ cmd->u.time_left <= 0) {
+ pmcraid_info("critical op is reset proceeding with reset\n");
+ spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
+ pmcraid_ioa_reset(cmd);
+ spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
+ } else {
+ pmcraid_info("critical op is not yet reset waiting again\n");
+ /* restart timer if some more time is available to wait */
+ cmd->u.time_left -= PMCRAID_CHECK_FOR_RESET_TIMEOUT;
+ cmd->timer.data = (unsigned long)cmd;
+ cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
+ cmd->timer.function =
+ (void (*)(unsigned long))pmcraid_reset_alert_done;
+ add_timer(&cmd->timer);
+ }
+}
+
+/**
+ * pmcraid_reset_alert - alerts IOA for a possible reset
+ * @cmd : command block to be used for reset sequence.
+ *
+ * Return Value
+ * returns 0 if pci config-space is accessible and RESET_DOORBELL is
+ * successfully written to IOA. Returns non-zero in case pci_config_space
+ * is not accessible
+ */
+static void pmcraid_reset_alert(struct pmcraid_cmd *cmd)
+{
+ struct pmcraid_instance *pinstance = cmd->drv_inst;
+ u32 doorbells;
+ int rc;
+ u16 pci_reg;
+
+ /* If we are able to access IOA PCI config space, alert IOA that we are
+ * going to reset it soon. This enables IOA to preserv persistent error
+ * data if any. In case memory space is not accessible, proceed with
+ * BIST or slot_reset
+ */
+ rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);
+ if ((rc == PCIBIOS_SUCCESSFUL) && (pci_reg & PCI_COMMAND_MEMORY)) {
+
+ /* wait for IOA permission i.e until CRITICAL_OPERATION bit is
+ * reset IOA doesn't generate any interrupts when CRITICAL
+ * OPERATION bit is reset. A timer is started to wait for this
+ * bit to be reset.
+ */
+ cmd->u.time_left = PMCRAID_RESET_TIMEOUT;
+ cmd->timer.data = (unsigned long)cmd;
+ cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
+ cmd->timer.function =
+ (void (*)(unsigned long))pmcraid_reset_alert_done;
+ add_timer(&cmd->timer);
+
+ iowrite32(DOORBELL_IOA_RESET_ALERT,
+ pinstance->int_regs.host_ioa_interrupt_reg);
+ doorbells =
+ ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
+ pmcraid_info("doorbells after reset alert: %x\n", doorbells);
+ } else {
+ pmcraid_info("PCI config is not accessible starting BIST\n");
+ pinstance->ioa_state = IOA_STATE_IN_HARD_RESET;
+ pmcraid_start_bist(cmd);
+ }
+}
+
+/**
+ * pmcraid_timeout_handler - Timeout handler for internally generated ops
+ *
+ * @cmd : pointer to command structure, that got timedout
+ *
+ * This function blocks host requests and initiates an adapter reset.
+ *
+ * Return value:
+ * None
+ */
+static void pmcraid_timeout_handler(struct pmcraid_cmd *cmd)
+{
+ struct pmcraid_instance *pinstance = cmd->drv_inst;
+ unsigned long lock_flags;
+
+ dev_err(&pinstance->pdev->dev,
+ "Adapter being reset due to command timeout.\n");
+
+ /* Command timeouts result in hard reset sequence. The command that got
+ * timed out may be the one used as part of reset sequence. In this
+ * case restart reset sequence using the same command block even if
+ * reset is in progress. Otherwise fail this command and get a free
+ * command block to restart the reset sequence.
+ */
+ spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
+ if (!pinstance->ioa_reset_in_progress) {
+ pinstance->ioa_reset_attempts = 0;
+ cmd = pmcraid_get_free_cmd(pinstance);
+
+ /* If we are out of command blocks, just return here itself.
+ * Some other command's timeout handler can do the reset job
+ */
+ if (cmd == NULL) {
+ spin_unlock_irqrestore(pinstance->host->host_lock,
+ lock_flags);
+ pmcraid_err("no free cmnd block for timeout handler\n");
+ return;
+ }
+
+ pinstance->reset_cmd = cmd;
+ pinstance->ioa_reset_in_progress = 1;
+ } else {
+ pmcraid_info("reset is already in progress\n");
+
+ if (pinstance->reset_cmd != cmd) {
+ /* This command should have been given to IOA, this
+ * command will be completed by fail_outstanding_cmds
+ * anyway
+ */
+ pmcraid_err("cmd is pending but reset in progress\n");
+ }
+
+ /* If this command was being used as part of the reset
+ * sequence, set cmd_done pointer to pmcraid_ioa_reset. This
+ * causes fail_outstanding_commands not to return the command
+ * block back to free pool
+ */
+ if (cmd == pinstance->reset_cmd)
+ cmd->cmd_done = pmcraid_ioa_reset;
+
+ }
+
+ pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
+ scsi_block_requests(pinstance->host);
+ pmcraid_reset_alert(cmd);
+ spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
+}
+
+/**
+ * pmcraid_internal_done - completion routine for internally generated cmds
+ *
+ * @cmd: command that got response from IOA
+ *
+ * Return Value:
+ * none
+ */
+static void pmcraid_internal_done(struct pmcraid_cmd *cmd)
+{
+ pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n",
+ cmd->ioa_cb->ioarcb.cdb[0],
+ le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
+
+ /* Some of the internal commands are sent with callers blocking for the
+ * response. Same will be indicated as part of cmd->completion_req
+ * field. Response path needs to wake up any waiters waiting for cmd
+ * completion if this flag is set.
+ */
+ if (cmd->completion_req) {
+ cmd->completion_req = 0;
+ complete(&cmd->wait_for_completion);
+ }
+
+ /* most of the internal commands are completed by caller itself, so
+ * no need to return the command block back to free pool until we are
+ * required to do so (e.g once done with initialization).
+ */
+ if (cmd->release) {
+ cmd->release = 0;
+ pmcraid_return_cmd(cmd);
+ }
+}
+
+/**
+ * pmcraid_reinit_cfgtable_done - done function for cfg table reinitialization
+ *
+ * @cmd: command that got response from IOA
+ *
+ * This routine is called after driver re-reads configuration table due to a
+ * lost CCN. It returns the command block back to free pool and schedules
+ * worker thread to add/delete devices into the system.
+ *
+ * Return Value:
+ * none
+ */
+static void pmcraid_reinit_cfgtable_done(struct pmcraid_cmd *cmd)
+{
+ pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n",
+ cmd->ioa_cb->ioarcb.cdb[0],
+ le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
+
+ if (cmd->release) {
+ cmd->release = 0;
+ pmcraid_return_cmd(cmd);
+ }
+ pmcraid_info("scheduling worker for config table reinitialization\n");
+ schedule_work(&cmd->drv_inst->worker_q);
+}
+
+/**
+ * pmcraid_erp_done - Process completion of SCSI error response from device
+ * @cmd: pmcraid_command
+ *
+ * This function copies the sense buffer into the scsi_cmd struct and completes
+ * scsi_cmd by calling scsi_done function.
+ *
+ * Return value:
+ * none
+ */
+static void pmcraid_erp_done(struct pmcraid_cmd *cmd)
+{
+ struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
+ struct pmcraid_instance *pinstance = cmd->drv_inst;
+ u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
+
+ if (PMCRAID_IOASC_SENSE_KEY(ioasc) > 0) {
+ scsi_cmd->result |= (DID_ERROR << 16);
+ pmcraid_err("command CDB[0] = %x failed with IOASC: 0x%08X\n",
+ cmd->ioa_cb->ioarcb.cdb[0], ioasc);
+ }
+
+ /* if we had allocated sense buffers for request sense, copy the sense
+ * release the buffers
+ */
+ if (cmd->sense_buffer != NULL) {
+ memcpy(scsi_cmd->sense_buffer,
+ cmd->sense_buffer,
+ SCSI_SENSE_BUFFERSIZE);
+ pci_free_consistent(pinstance->pdev,
+ SCSI_SENSE_BUFFERSIZE,
+ cmd->sense_buffer, cmd->sense_buffer_dma);
+ cmd->sense_buffer = NULL;
+ cmd->sense_buffer_dma = 0;
+ }
+
+ scsi_dma_unmap(scsi_cmd);
+ pmcraid_return_cmd(cmd);
+ scsi_cmd->scsi_done(scsi_cmd);
+}
+
+/**
+ * pmcraid_fire_command - sends an IOA command to adapter
+ *
+ * This function adds the given block into pending command list
+ * and returns without waiting
+ *
+ * @cmd : command to be sent to the device
+ *
+ * Return Value
+ * None
+ */
+static void _pmcraid_fire_command(struct pmcraid_cmd *cmd)
+{
+ struct pmcraid_instance *pinstance = cmd->drv_inst;
+ unsigned long lock_flags;
+
+ /* Add this command block to pending cmd pool. We do this prior to
+ * writting IOARCB to ioarrin because IOA might complete the command
+ * by the time we are about to add it to the list. Response handler
+ * (isr/tasklet) looks for cmb block in the pending pending list.
+ */
+ spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
+ list_add_tail(&cmd->free_list, &pinstance->pending_cmd_pool);
+ spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags);
+ atomic_inc(&pinstance->outstanding_cmds);
+
+ /* driver writes lower 32-bit value of IOARCB address only */
+ mb();
+ iowrite32(le32_to_cpu(cmd->ioa_cb->ioarcb.ioarcb_bus_addr),
+ pinstance->ioarrin);
+}
+
+/**
+ * pmcraid_send_cmd - fires a command to IOA
+ *
+ * This function also sets up timeout function, and command completion
+ * function
+ *
+ * @cmd: pointer to the command block to be fired to IOA
+ * @cmd_done: command completion function, called once IOA responds
+ * @timeout: timeout to wait for this command completion
+ * @timeout_func: timeout handler
+ *
+ * Return value
+ * none
+ */
+static void pmcraid_send_cmd(
+ struct pmcraid_cmd *cmd,
+ void (*cmd_done) (struct pmcraid_cmd *),
+ unsigned long timeout,
+ void (*timeout_func) (struct pmcraid_cmd *)
+)
+{
+ /* initialize done function */
+ cmd->cmd_done = cmd_done;
+
+ if (timeout_func) {
+ /* setup timeout handler */
+ cmd->timer.data = (unsigned long)cmd;
+ cmd->timer.expires = jiffies + timeout;
+ cmd->timer.function = (void (*)(unsigned long))timeout_func;
+ add_timer(&cmd->timer);
+ }
+
+ /* fire the command to IOA */
+ _pmcraid_fire_command(cmd);
+}
+
+/**
+ * pmcraid_ioa_shutdown - sends SHUTDOWN command to ioa
+ *
+ * @cmd: pointer to the command block used as part of reset sequence
+ *
+ * Return Value
+ * None
+ */
+static void pmcraid_ioa_shutdown(struct pmcraid_cmd *cmd)
+{
+ pmcraid_info("response for Cancel CCN CDB[0] = %x ioasc = %x\n",
+ cmd->ioa_cb->ioarcb.cdb[0],
+ le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
+
+ /* Note that commands sent during reset require next command to be sent
+ * to IOA. Hence reinit the done function as well as timeout function
+ */
+ pmcraid_reinit_cmdblk(cmd);
+ cmd->ioa_cb->ioarcb.request_type = REQ_TYPE_IOACMD;
+ cmd->ioa_cb->ioarcb.resource_handle =
+ cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
+ cmd->ioa_cb->ioarcb.cdb[0] = PMCRAID_IOA_SHUTDOWN;
+ cmd->ioa_cb->ioarcb.cdb[1] = PMCRAID_SHUTDOWN_NORMAL;
+
+ /* fire shutdown command to hardware. */
+ pmcraid_info("firing normal shutdown command (%d) to IOA\n",
+ le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle));
+
+ pmcraid_send_cmd(cmd, pmcraid_ioa_reset,
+ PMCRAID_SHUTDOWN_TIMEOUT,
+ pmcraid_timeout_handler);
+}
+
+/**
+ * pmcraid_identify_hrrq - registers host rrq buffers with IOA
+ * @cmd: pointer to command block to be used for identify hrrq
+ *
+ * Return Value
+ * 0 in case of success, otherwise non-zero failure code
+ */
+
+static void pmcraid_querycfg(struct pmcraid_cmd *);
+
+static void pmcraid_identify_hrrq(struct pmcraid_cmd *cmd)
+{
+ struct pmcraid_instance *pinstance = cmd->drv_inst;
+ struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
+ int index = 0;
+ __be64 hrrq_addr = cpu_to_be64(pinstance->hrrq_start_bus_addr[index]);
+ u32 hrrq_size = cpu_to_be32(sizeof(u32) * PMCRAID_MAX_CMD);
+
+ pmcraid_reinit_cmdblk(cmd);
+
+ /* Initialize ioarcb */
+ ioarcb->request_type = REQ_TYPE_IOACMD;
+ ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
+
+ /* initialize the hrrq number where IOA will respond to this command */
+ ioarcb->hrrq_id = index;
+ ioarcb->cdb[0] = PMCRAID_IDENTIFY_HRRQ;
+ ioarcb->cdb[1] = index;
+
+ /* IOA expects 64-bit pci address to be written in B.E format
+ * (i.e cdb[2]=MSByte..cdb[9]=LSB.
+ */
+ pmcraid_info("HRRQ_IDENTIFY with hrrq:ioarcb => %llx:%llx\n",
+ hrrq_addr, ioarcb->ioarcb_bus_addr);
+
+ memcpy(&(ioarcb->cdb[2]), &hrrq_addr, sizeof(hrrq_addr));
+ memcpy(&(ioarcb->cdb[10]), &hrrq_size, sizeof(hrrq_size));
+
+ /* Subsequent commands require HRRQ identification to be successful.
+ * Note that this gets called even during reset from SCSI mid-layer
+ * or tasklet
+ */
+ pmcraid_send_cmd(cmd, pmcraid_querycfg,
+ PMCRAID_INTERNAL_TIMEOUT,
+ pmcraid_timeout_handler);
+}
+
+static void pmcraid_process_ccn(struct pmcraid_cmd *cmd);
+static void pmcraid_process_ldn(struct pmcraid_cmd *cmd);
+
+/**
+ * pmcraid_send_hcam_cmd - send an initialized command block(HCAM) to IOA
+ *
+ * @cmd: initialized command block pointer
+ *
+ * Return Value
+ * none
+ */
+static void pmcraid_send_hcam_cmd(struct pmcraid_cmd *cmd)
+{
+ if (cmd->ioa_cb->ioarcb.cdb[1] == PMCRAID_HCAM_CODE_CONFIG_CHANGE)
+ atomic_set(&(cmd->drv_inst->ccn.ignore), 0);
+ else
+ atomic_set(&(cmd->drv_inst->ldn.ignore), 0);
+
+ pmcraid_send_cmd(cmd, cmd->cmd_done, 0, NULL);
+}
+
+/**
+ * pmcraid_init_hcam - send an initialized command block(HCAM) to IOA
+ *
+ * @pinstance: pointer to adapter instance structure
+ * @type: HCAM type
+ *
+ * Return Value
+ * pointer to initialized pmcraid_cmd structure or NULL
+ */
+static struct pmcraid_cmd *pmcraid_init_hcam
+(
+ struct pmcraid_instance *pinstance,
+ u8 type
+)
+{
+ struct pmcraid_cmd *cmd;
+ struct pmcraid_ioarcb *ioarcb;
+ struct pmcraid_ioadl_desc *ioadl;
+ struct pmcraid_hostrcb *hcam;
+ void (*cmd_done) (struct pmcraid_cmd *);
+ dma_addr_t dma;
+ int rcb_size;
+
+ cmd = pmcraid_get_free_cmd(pinstance);
+
+ if (!cmd) {
+ pmcraid_err("no free command blocks for hcam\n");
+ return cmd;
+ }
+
+ if (type == PMCRAID_HCAM_CODE_CONFIG_CHANGE) {
+ rcb_size = sizeof(struct pmcraid_hcam_ccn);
+ cmd_done = pmcraid_process_ccn;
+ dma = pinstance->ccn.baddr + PMCRAID_AEN_HDR_SIZE;
+ hcam = &pinstance->ccn;
+ } else {
+ rcb_size = sizeof(struct pmcraid_hcam_ldn);
+ cmd_done = pmcraid_process_ldn;
+ dma = pinstance->ldn.baddr + PMCRAID_AEN_HDR_SIZE;
+ hcam = &pinstance->ldn;
+ }
+
+ /* initialize command pointer used for HCAM registration */
+ hcam->cmd = cmd;
+
+ ioarcb = &cmd->ioa_cb->ioarcb;
+ ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
+ offsetof(struct pmcraid_ioarcb,
+ add_data.u.ioadl[0]));
+ ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
+ ioadl = ioarcb->add_data.u.ioadl;
+
+ /* Initialize ioarcb */
+ ioarcb->request_type = REQ_TYPE_HCAM;
+ ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
+ ioarcb->cdb[0] = PMCRAID_HOST_CONTROLLED_ASYNC;
+ ioarcb->cdb[1] = type;
+ ioarcb->cdb[7] = (rcb_size >> 8) & 0xFF;
+ ioarcb->cdb[8] = (rcb_size) & 0xFF;
+
+ ioarcb->data_transfer_length = cpu_to_le32(rcb_size);
+
+ ioadl[0].flags |= cpu_to_le32(IOADL_FLAGS_READ_LAST);
+ ioadl[0].data_len = cpu_to_le32(rcb_size);
+ ioadl[0].address = cpu_to_le32(dma);
+
+ cmd->cmd_done = cmd_done;
+ return cmd;
+}
+
+/**
+ * pmcraid_send_hcam - Send an HCAM to IOA
+ * @pinstance: ioa config struct
+ * @type: HCAM type
+ *
+ * This function will send a Host Controlled Async command to IOA.
+ *
+ * Return value:
+ * none
+ */
+static void pmcraid_send_hcam(struct pmcraid_instance *pinstance, u8 type)
+{
+ struct pmcraid_cmd *cmd = pmcraid_init_hcam(pinstance, type);
+ pmcraid_send_hcam_cmd(cmd);
+}
+
+
+/**
+ * pmcraid_prepare_cancel_cmd - prepares a command block to abort another
+ *
+ * @cmd: pointer to cmd that is used as cancelling command
+ * @cmd_to_cancel: pointer to the command that needs to be cancelled
+ */
+static void pmcraid_prepare_cancel_cmd(
+ struct pmcraid_cmd *cmd,
+ struct pmcraid_cmd *cmd_to_cancel
+)
+{
+ struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
+ __be64 ioarcb_addr = cmd_to_cancel->ioa_cb->ioarcb.ioarcb_bus_addr;
+
+ /* Get the resource handle to where the command to be aborted has been
+ * sent.
+ */
+ ioarcb->resource_handle = cmd_to_cancel->ioa_cb->ioarcb.resource_handle;
+ ioarcb->request_type = REQ_TYPE_IOACMD;
+ memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
+ ioarcb->cdb[0] = PMCRAID_ABORT_CMD;
+
+ /* IOARCB address of the command to be cancelled is given in
+ * cdb[2]..cdb[9] is Big-Endian format. Note that length bits in
+ * IOARCB address are not masked.
+ */
+ ioarcb_addr = cpu_to_be64(ioarcb_addr);
+ memcpy(&(ioarcb->cdb[2]), &ioarcb_addr, sizeof(ioarcb_addr));
+}
+
+/**
+ * pmcraid_cancel_hcam - sends ABORT task to abort a given HCAM
+ *
+ * @cmd: command to be used as cancelling command
+ * @type: HCAM type
+ * @cmd_done: op done function for the cancelling command
+ */
+static void pmcraid_cancel_hcam(
+ struct pmcraid_cmd *cmd,
+ u8 type,
+ void (*cmd_done) (struct pmcraid_cmd *)
+)
+{
+ struct pmcraid_instance *pinstance;
+ struct pmcraid_hostrcb *hcam;
+
+ pinstance = cmd->drv_inst;
+ hcam = (type == PMCRAID_HCAM_CODE_LOG_DATA) ?
+ &pinstance->ldn : &pinstance->ccn;
+
+ /* prepare for cancelling previous hcam command. If the HCAM is
+ * currently not pending with IOA, we would have hcam->cmd as non-null
+ */
+ if (hcam->cmd == NULL)
+ return;
+
+ pmcraid_prepare_cancel_cmd(cmd, hcam->cmd);
+
+ /* writing to IOARRIN must be protected by host_lock, as mid-layer
+ * schedule queuecommand while we are doing this
+ */
+ pmcraid_send_cmd(cmd, cmd_done,
+ PMCRAID_INTERNAL_TIMEOUT,
+ pmcraid_timeout_handler);
+}
+
+/**
+ * pmcraid_cancel_ccn - cancel CCN HCAM already registered with IOA
+ *
+ * @cmd: command block to be used for cancelling the HCAM
+ */
+static void pmcraid_cancel_ccn(struct pmcraid_cmd *cmd)
+{
+ pmcraid_info("response for Cancel LDN CDB[0] = %x ioasc = %x\n",
+ cmd->ioa_cb->ioarcb.cdb[0],
+ le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
+
+ pmcraid_reinit_cmdblk(cmd);
+
+ pmcraid_cancel_hcam(cmd,
+ PMCRAID_HCAM_CODE_CONFIG_CHANGE,
+ pmcraid_ioa_shutdown);
+}
+
+/**
+ * pmcraid_cancel_ldn - cancel LDN HCAM already registered with IOA
+ *
+ * @cmd: command block to be used for cancelling the HCAM
+ */
+static void pmcraid_cancel_ldn(struct pmcraid_cmd *cmd)
+{
+ pmcraid_cancel_hcam(cmd,
+ PMCRAID_HCAM_CODE_LOG_DATA,
+ pmcraid_cancel_ccn);
+}
+
+/**
+ * pmcraid_expose_resource - check if the resource can be exposed to OS
+ *
+ * @cfgte: pointer to configuration table entry of the resource
+ *
+ * Return value:
+ * true if resource can be added to midlayer, false(0) otherwise
+ */
+static int pmcraid_expose_resource(struct pmcraid_config_table_entry *cfgte)
+{
+ int retval = 0;
+
+ if (cfgte->resource_type == RES_TYPE_VSET)
+ retval = ((cfgte->unique_flags1 & 0xFF) < 0xFE);
+ else if (cfgte->resource_type == RES_TYPE_GSCSI)
+ retval = (RES_BUS(cfgte->resource_address) !=
+ PMCRAID_VIRTUAL_ENCL_BUS_ID);
+ return retval;
+}
+
+/* attributes supported by pmcraid_event_family */
+enum {
+ PMCRAID_AEN_ATTR_UNSPEC,
+ PMCRAID_AEN_ATTR_EVENT,
+ __PMCRAID_AEN_ATTR_MAX,
+};
+#define PMCRAID_AEN_ATTR_MAX (__PMCRAID_AEN_ATTR_MAX - 1)
+
+/* commands supported by pmcraid_event_family */
+enum {
+ PMCRAID_AEN_CMD_UNSPEC,
+ PMCRAID_AEN_CMD_EVENT,
+ __PMCRAID_AEN_CMD_MAX,
+};
+#define PMCRAID_AEN_CMD_MAX (__PMCRAID_AEN_CMD_MAX - 1)
+
+static struct genl_family pmcraid_event_family = {
+ .id = GENL_ID_GENERATE,
+ .name = "pmcraid",
+ .version = 1,
+ .maxattr = PMCRAID_AEN_ATTR_MAX
+};
+
+/**
+ * pmcraid_netlink_init - registers pmcraid_event_family
+ *
+ * Return value:
+ * 0 if the pmcraid_event_family is successfully registered
+ * with netlink generic, non-zero otherwise
+ */
+static int pmcraid_netlink_init(void)
+{
+ int result;
+
+ result = genl_register_family(&pmcraid_event_family);
+
+ if (result)
+ return result;
+
+ pmcraid_info("registered NETLINK GENERIC group: %d\n",
+ pmcraid_event_family.id);
+
+ return result;
+}
+
+/**
+ * pmcraid_netlink_release - unregisters pmcraid_event_family
+ *
+ * Return value:
+ * none
+ */
+static void pmcraid_netlink_release(void)
+{
+ genl_unregister_family(&pmcraid_event_family);
+}
+
+/**
+ * pmcraid_notify_aen - sends event msg to user space application
+ * @pinstance: pointer to adapter instance structure
+ * @type: HCAM type
+ *
+ * Return value:
+ * 0 if success, error value in case of any failure.
+ */
+static int pmcraid_notify_aen(struct pmcraid_instance *pinstance, u8 type)
+{
+ struct sk_buff *skb;
+ struct pmcraid_aen_msg *aen_msg;
+ void *msg_header;
+ int data_size, total_size;
+ int result;
+
+
+ if (type == PMCRAID_HCAM_CODE_LOG_DATA) {
+ aen_msg = pinstance->ldn.msg;
+ data_size = pinstance->ldn.hcam->data_len;
+ } else {
+ aen_msg = pinstance->ccn.msg;
+ data_size = pinstance->ccn.hcam->data_len;
+ }
+
+ data_size += sizeof(struct pmcraid_hcam_hdr);
+ aen_msg->hostno = (pinstance->host->unique_id << 16 |
+ MINOR(pinstance->cdev.dev));
+ aen_msg->length = data_size;
+ data_size += sizeof(*aen_msg);
+
+ total_size = nla_total_size(data_size);
+ skb = genlmsg_new(total_size, GFP_ATOMIC);
+
+
+ if (!skb) {
+ pmcraid_err("Failed to allocate aen data SKB of size: %x\n",
+ total_size);
+ return -ENOMEM;
+ }
+
+ /* add the genetlink message header */
+ msg_header = genlmsg_put(skb, 0, 0,
+ &pmcraid_event_family, 0,
+ PMCRAID_AEN_CMD_EVENT);
+ if (!msg_header) {
+ pmcraid_err("failed to copy command details\n");
+ nlmsg_free(skb);
+ return -ENOMEM;
+ }
+
+ result = nla_put(skb, PMCRAID_AEN_ATTR_EVENT, data_size, aen_msg);
+
+ if (result) {
+ pmcraid_err("failed to copy AEN attribute data \n");
+ nlmsg_free(skb);
+ return -EINVAL;
+ }
+
+ /* send genetlink multicast message to notify appplications */
+ result = genlmsg_end(skb, msg_header);
+
+ if (result < 0) {
+ pmcraid_err("genlmsg_end failed\n");
+ nlmsg_free(skb);
+ return result;
+ }
+
+ result =
+ genlmsg_multicast(skb, 0, pmcraid_event_family.id, GFP_ATOMIC);
+
+ /* If there are no listeners, genlmsg_multicast may return non-zero
+ * value.
+ */
+ if (result)
+ pmcraid_info("failed to send %s event message %x!\n",
+ type == PMCRAID_HCAM_CODE_LOG_DATA ? "LDN" : "CCN",
+ result);
+ return result;
+}
+
+/**
+ * pmcraid_handle_config_change - Handle a config change from the adapter
+ * @pinstance: pointer to per adapter instance structure
+ *
+ * Return value:
+ * none
+ */
+static void pmcraid_handle_config_change(struct pmcraid_instance *pinstance)
+{
+ struct pmcraid_config_table_entry *cfg_entry;
+ struct pmcraid_hcam_ccn *ccn_hcam;
+ struct pmcraid_cmd *cmd;
+ struct pmcraid_cmd *cfgcmd;
+ struct pmcraid_resource_entry *res = NULL;
+ u32 new_entry = 1;
+ unsigned long lock_flags;
+ unsigned long host_lock_flags;
+ int rc;
+
+ ccn_hcam = (struct pmcraid_hcam_ccn *)pinstance->ccn.hcam;
+ cfg_entry = &ccn_hcam->cfg_entry;
+
+ pmcraid_info
+ ("CCN(%x): %x type: %x lost: %x flags: %x res: %x:%x:%x:%x\n",
+ pinstance->ccn.hcam->ilid,
+ pinstance->ccn.hcam->op_code,
+ pinstance->ccn.hcam->notification_type,
+ pinstance->ccn.hcam->notification_lost,
+ pinstance->ccn.hcam->flags,
+ pinstance->host->unique_id,
+ RES_IS_VSET(*cfg_entry) ? PMCRAID_VSET_BUS_ID :
+ (RES_IS_GSCSI(*cfg_entry) ? PMCRAID_PHYS_BUS_ID :
+ RES_BUS(cfg_entry->resource_address)),
+ RES_IS_VSET(*cfg_entry) ? cfg_entry->unique_flags1 :
+ RES_TARGET(cfg_entry->resource_address),
+ RES_LUN(cfg_entry->resource_address));
+
+
+ /* If this HCAM indicates a lost notification, read the config table */
+ if (pinstance->ccn.hcam->notification_lost) {
+ cfgcmd = pmcraid_get_free_cmd(pinstance);
+ if (cfgcmd) {
+ pmcraid_info("lost CCN, reading config table\b");
+ pinstance->reinit_cfg_table = 1;
+ pmcraid_querycfg(cfgcmd);
+ } else {
+ pmcraid_err("lost CCN, no free cmd for querycfg\n");
+ }
+ goto out_notify_apps;
+ }
+
+ /* If this resource is not going to be added to mid-layer, just notify
+ * applications and return
+ */
+ if (!pmcraid_expose_resource(cfg_entry))
+ goto out_notify_apps;
+
+ spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
+ list_for_each_entry(res, &pinstance->used_res_q, queue) {
+ rc = memcmp(&res->cfg_entry.resource_address,
+ &cfg_entry->resource_address,
+ sizeof(cfg_entry->resource_address));
+ if (!rc) {
+ new_entry = 0;
+ break;
+ }
+ }
+
+ if (new_entry) {
+
+ /* If there are more number of resources than what driver can
+ * manage, do not notify the applications about the CCN. Just
+ * ignore this notifications and re-register the same HCAM
+ */
+ if (list_empty(&pinstance->free_res_q)) {
+ spin_unlock_irqrestore(&pinstance->resource_lock,
+ lock_flags);
+ pmcraid_err("too many resources attached\n");
+ spin_lock_irqsave(pinstance->host->host_lock,
+ host_lock_flags);
+ pmcraid_send_hcam(pinstance,
+ PMCRAID_HCAM_CODE_CONFIG_CHANGE);
+ spin_unlock_irqrestore(pinstance->host->host_lock,
+ host_lock_flags);
+ return;
+ }
+
+ res = list_entry(pinstance->free_res_q.next,
+ struct pmcraid_resource_entry, queue);
+
+ list_del(&res->queue);
+ res->scsi_dev = NULL;
+ res->reset_progress = 0;
+ list_add_tail(&res->queue, &pinstance->used_res_q);
+ }
+
+ memcpy(&res->cfg_entry, cfg_entry,
+ sizeof(struct pmcraid_config_table_entry));
+
+ if (pinstance->ccn.hcam->notification_type ==
+ NOTIFICATION_TYPE_ENTRY_DELETED) {
+ if (res->scsi_dev) {
+ res->change_detected = RES_CHANGE_DEL;
+ res->cfg_entry.resource_handle =
+ PMCRAID_INVALID_RES_HANDLE;
+ schedule_work(&pinstance->worker_q);
+ } else {
+ /* This may be one of the non-exposed resources */
+ list_move_tail(&res->queue, &pinstance->free_res_q);
+ }
+ } else if (!res->scsi_dev) {
+ res->change_detected = RES_CHANGE_ADD;
+ schedule_work(&pinstance->worker_q);
+ }
+ spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
+
+out_notify_apps:
+
+ /* Notify configuration changes to registered applications.*/
+ if (!pmcraid_disable_aen)
+ pmcraid_notify_aen(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
+
+ cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
+ if (cmd)
+ pmcraid_send_hcam_cmd(cmd);
+}
+
+/**
+ * pmcraid_get_error_info - return error string for an ioasc
+ * @ioasc: ioasc code
+ * Return Value
+ * none
+ */
+static struct pmcraid_ioasc_error *pmcraid_get_error_info(u32 ioasc)
+{
+ int i;
+ for (i = 0; i < ARRAY_SIZE(pmcraid_ioasc_error_table); i++) {
+ if (pmcraid_ioasc_error_table[i].ioasc_code == ioasc)
+ return &pmcraid_ioasc_error_table[i];
+ }
+ return NULL;
+}
+
+/**
+ * pmcraid_ioasc_logger - log IOASC information based user-settings
+ * @ioasc: ioasc code
+ * @cmd: pointer to command that resulted in 'ioasc'
+ */
+void pmcraid_ioasc_logger(u32 ioasc, struct pmcraid_cmd *cmd)
+{
+ struct pmcraid_ioasc_error *error_info = pmcraid_get_error_info(ioasc);
+
+ if (error_info == NULL ||
+ cmd->drv_inst->current_log_level < error_info->log_level)
+ return;
+
+ /* log the error string */
+ pmcraid_err("cmd [%d] for resource %x failed with %x(%s)\n",
+ cmd->ioa_cb->ioarcb.cdb[0],
+ cmd->ioa_cb->ioarcb.resource_handle,
+ le32_to_cpu(ioasc), error_info->error_string);
+}
+
+/**
+ * pmcraid_handle_error_log - Handle a config change (error log) from the IOA
+ *
+ * @pinstance: pointer to per adapter instance structure
+ *
+ * Return value:
+ * none
+ */
+static void pmcraid_handle_error_log(struct pmcraid_instance *pinstance)
+{
+ struct pmcraid_hcam_ldn *hcam_ldn;
+ u32 ioasc;
+
+ hcam_ldn = (struct pmcraid_hcam_ldn *)pinstance->ldn.hcam;
+
+ pmcraid_info
+ ("LDN(%x): %x type: %x lost: %x flags: %x overlay id: %x\n",
+ pinstance->ldn.hcam->ilid,
+ pinstance->ldn.hcam->op_code,
+ pinstance->ldn.hcam->notification_type,
+ pinstance->ldn.hcam->notification_lost,
+ pinstance->ldn.hcam->flags,
+ pinstance->ldn.hcam->overlay_id);
+
+ /* log only the errors, no need to log informational log entries */
+ if (pinstance->ldn.hcam->notification_type !=
+ NOTIFICATION_TYPE_ERROR_LOG)
+ return;
+
+ if (pinstance->ldn.hcam->notification_lost ==
+ HOSTRCB_NOTIFICATIONS_LOST)
+ dev_err(&pinstance->pdev->dev, "Error notifications lost\n");
+
+ ioasc = le32_to_cpu(hcam_ldn->error_log.fd_ioasc);
+
+ if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET ||
+ ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER) {
+ dev_err(&pinstance->pdev->dev,
+ "UnitAttention due to IOA Bus Reset\n");
+ scsi_report_bus_reset(
+ pinstance->host,
+ RES_BUS(hcam_ldn->error_log.fd_ra));
+ }
+
+ return;
+}
+
+/**
+ * pmcraid_process_ccn - Op done function for a CCN.
+ * @cmd: pointer to command struct
+ *
+ * This function is the op done function for a configuration
+ * change notification
+ *
+ * Return value:
+ * none
+ */
+static void pmcraid_process_ccn(struct pmcraid_cmd *cmd)
+{
+ struct pmcraid_instance *pinstance = cmd->drv_inst;
+ u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
+ unsigned long lock_flags;
+
+ pinstance->ccn.cmd = NULL;
+ pmcraid_return_cmd(cmd);
+
+ /* If driver initiated IOA reset happened while this hcam was pending
+ * with IOA, or IOA bringdown sequence is in progress, no need to
+ * re-register the hcam
+ */
+ if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
+ atomic_read(&pinstance->ccn.ignore) == 1) {
+ return;
+ } else if (ioasc) {
+ dev_err(&pinstance->pdev->dev,
+ "Host RCB (CCN) failed with IOASC: 0x%08X\n", ioasc);
+ spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
+ pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
+ spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
+ } else {
+ pmcraid_handle_config_change(pinstance);
+ }
+}
+
+/**
+ * pmcraid_process_ldn - op done function for an LDN
+ * @cmd: pointer to command block
+ *
+ * Return value
+ * none
+ */
+static void pmcraid_initiate_reset(struct pmcraid_instance *);
+
+static void pmcraid_process_ldn(struct pmcraid_cmd *cmd)
+{
+ struct pmcraid_instance *pinstance = cmd->drv_inst;
+ struct pmcraid_hcam_ldn *ldn_hcam =
+ (struct pmcraid_hcam_ldn *)pinstance->ldn.hcam;
+ u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
+ u32 fd_ioasc = le32_to_cpu(ldn_hcam->error_log.fd_ioasc);
+ unsigned long lock_flags;
+
+ /* return the command block back to freepool */
+ pinstance->ldn.cmd = NULL;
+ pmcraid_return_cmd(cmd);
+
+ /* If driver initiated IOA reset happened while this hcam was pending
+ * with IOA, no need to re-register the hcam as reset engine will do it
+ * once reset sequence is complete
+ */
+ if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
+ atomic_read(&pinstance->ccn.ignore) == 1) {
+ return;
+ } else if (!ioasc) {
+ pmcraid_handle_error_log(pinstance);
+ if (fd_ioasc == PMCRAID_IOASC_NR_IOA_RESET_REQUIRED) {
+ spin_lock_irqsave(pinstance->host->host_lock,
+ lock_flags);
+ pmcraid_initiate_reset(pinstance);
+ spin_unlock_irqrestore(pinstance->host->host_lock,
+ lock_flags);
+ return;
+ }
+ } else {
+ dev_err(&pinstance->pdev->dev,
+ "Host RCB(LDN) failed with IOASC: 0x%08X\n", ioasc);
+ }
+ /* send netlink message for HCAM notification if enabled */
+ if (!pmcraid_disable_aen)
+ pmcraid_notify_aen(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
+
+ cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
+ if (cmd)
+ pmcraid_send_hcam_cmd(cmd);
+}
+
+/**
+ * pmcraid_register_hcams - register HCAMs for CCN and LDN
+ *
+ * @pinstance: pointer per adapter instance structure
+ *
+ * Return Value
+ * none
+ */
+static void pmcraid_register_hcams(struct pmcraid_instance *pinstance)
+{
+ pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
+ pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
+}
+
+/**
+ * pmcraid_unregister_hcams - cancel HCAMs registered already
+ * @cmd: pointer to command used as part of reset sequence
+ */
+static void pmcraid_unregister_hcams(struct pmcraid_cmd *cmd)
+{
+ struct pmcraid_instance *pinstance = cmd->drv_inst;
+
+ /* During IOA bringdown, HCAM gets fired and tasklet proceeds with
+ * handling hcam response though it is not necessary. In order to
+ * prevent this, set 'ignore', so that bring-down sequence doesn't
+ * re-send any more hcams
+ */
+ atomic_set(&pinstance->ccn.ignore, 1);
+ atomic_set(&pinstance->ldn.ignore, 1);
+
+ /* If adapter reset was forced as part of runtime reset sequence,
+ * start the reset sequence.
+ */
+ if (pinstance->force_ioa_reset && !pinstance->ioa_bringdown) {
+ pinstance->force_ioa_reset = 0;
+ pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
+ pmcraid_reset_alert(cmd);
+ return;
+ }
+
+ /* Driver tries to cancel HCAMs by sending ABORT TASK for each HCAM
+ * one after the other. So CCN cancellation will be triggered by
+ * pmcraid_cancel_ldn itself.
+ */
+ pmcraid_cancel_ldn(cmd);
+}
+
+/**
+ * pmcraid_reset_enable_ioa - re-enable IOA after a hard reset
+ * @pinstance: pointer to adapter instance structure
+ * Return Value
+ * 1 if TRANSITION_TO_OPERATIONAL is active, otherwise 0
+ */
+static void pmcraid_reinit_buffers(struct pmcraid_instance *);
+
+static int pmcraid_reset_enable_ioa(struct pmcraid_instance *pinstance)
+{
+ u32 intrs;
+
+ pmcraid_reinit_buffers(pinstance);
+ intrs = pmcraid_read_interrupts(pinstance);
+
+ pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
+
+ if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) {
+ iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
+ pinstance->int_regs.ioa_host_interrupt_mask_reg);
+ iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
+ pinstance->int_regs.ioa_host_interrupt_clr_reg);
+ return 1;
+ } else {
+ return 0;
+ }
+}
+
+/**
+ * pmcraid_soft_reset - performs a soft reset and makes IOA become ready
+ * @cmd : pointer to reset command block
+ *
+ * Return Value
+ * none
+ */
+static void pmcraid_soft_reset(struct pmcraid_cmd *cmd)
+{
+ struct pmcraid_instance *pinstance = cmd->drv_inst;
+ u32 int_reg;
+ u32 doorbell;
+
+ /* There will be an interrupt when Transition to Operational bit is
+ * set so tasklet would execute next reset task. The timeout handler
+ * would re-initiate a reset
+ */
+ cmd->cmd_done = pmcraid_ioa_reset;
+ cmd->timer.data = (unsigned long)cmd;
+ cmd->timer.expires = jiffies +
+ msecs_to_jiffies(PMCRAID_TRANSOP_TIMEOUT);
+ cmd->timer.function = (void (*)(unsigned long))pmcraid_timeout_handler;
+
+ if (!timer_pending(&cmd->timer))
+ add_timer(&cmd->timer);
+
+ /* Enable destructive diagnostics on IOA if it is not yet in
+ * operational state
+ */
+ doorbell = DOORBELL_RUNTIME_RESET |
+ DOORBELL_ENABLE_DESTRUCTIVE_DIAGS;
+
+ iowrite32(doorbell, pinstance->int_regs.host_ioa_interrupt_reg);
+ int_reg = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
+ pmcraid_info("Waiting for IOA to become operational %x:%x\n",
+ ioread32(pinstance->int_regs.host_ioa_interrupt_reg),
+ int_reg);
+}
+
+/**
+ * pmcraid_get_dump - retrieves IOA dump in case of Unit Check interrupt
+ *
+ * @pinstance: pointer to adapter instance structure
+ *
+ * Return Value
+ * none
+ */
+static void pmcraid_get_dump(struct pmcraid_instance *pinstance)
+{
+ pmcraid_info("%s is not yet implemented\n", __func__);
+}
+
+/**
+ * pmcraid_fail_outstanding_cmds - Fails all outstanding ops.
+ * @pinstance: pointer to adapter instance structure
+ *
+ * This function fails all outstanding ops. If they are submitted to IOA
+ * already, it sends cancel all messages if IOA is still accepting IOARCBs,
+ * otherwise just completes the commands and returns the cmd blocks to free
+ * pool.
+ *
+ * Return value:
+ * none
+ */
+static void pmcraid_fail_outstanding_cmds(struct pmcraid_instance *pinstance)
+{
+ struct pmcraid_cmd *cmd, *temp;
+ unsigned long lock_flags;
+
+ /* pending command list is protected by pending_pool_lock. Its
+ * traversal must be done as within this lock
+ */
+ spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
+ list_for_each_entry_safe(cmd, temp, &pinstance->pending_cmd_pool,
+ free_list) {
+ list_del(&cmd->free_list);
+ spin_unlock_irqrestore(&pinstance->pending_pool_lock,
+ lock_flags);
+ cmd->ioa_cb->ioasa.ioasc =
+ cpu_to_le32(PMCRAID_IOASC_IOA_WAS_RESET);
+ cmd->ioa_cb->ioasa.ilid =
+ cpu_to_be32(PMCRAID_DRIVER_ILID);
+
+ /* In case the command timer is still running */
+ del_timer(&cmd->timer);
+
+ /* If this is an IO command, complete it by invoking scsi_done
+ * function. If this is one of the internal commands other
+ * than pmcraid_ioa_reset and HCAM commands invoke cmd_done to
+ * complete it
+ */
+ if (cmd->scsi_cmd) {
+
+ struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
+ __le32 resp = cmd->ioa_cb->ioarcb.response_handle;
+
+ scsi_cmd->result |= DID_ERROR << 16;
+
+ scsi_dma_unmap(scsi_cmd);
+ pmcraid_return_cmd(cmd);
+
+
+ pmcraid_info("failing(%d) CDB[0] = %x result: %x\n",
+ le32_to_cpu(resp) >> 2,
+ cmd->ioa_cb->ioarcb.cdb[0],
+ scsi_cmd->result);
+ scsi_cmd->scsi_done(scsi_cmd);
+ } else if (cmd->cmd_done == pmcraid_internal_done ||
+ cmd->cmd_done == pmcraid_erp_done) {
+ cmd->cmd_done(cmd);
+ } else if (cmd->cmd_done != pmcraid_ioa_reset) {
+ pmcraid_return_cmd(cmd);
+ }
+
+ atomic_dec(&pinstance->outstanding_cmds);
+ spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
+ }
+
+ spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags);
+}
+
+/**
+ * pmcraid_ioa_reset - Implementation of IOA reset logic
+ *
+ * @cmd: pointer to the cmd block to be used for entire reset process
+ *
+ * This function executes most of the steps required for IOA reset. This gets
+ * called by user threads (modprobe/insmod/rmmod) timer, tasklet and midlayer's
+ * 'eh_' thread. Access to variables used for controling the reset sequence is
+ * synchronized using host lock. Various functions called during reset process
+ * would make use of a single command block, pointer to which is also stored in
+ * adapter instance structure.
+ *
+ * Return Value
+ * None
+ */
+static void pmcraid_ioa_reset(struct pmcraid_cmd *cmd)
+{
+ struct pmcraid_instance *pinstance = cmd->drv_inst;
+ u8 reset_complete = 0;
+
+ pinstance->ioa_reset_in_progress = 1;
+
+ if (pinstance->reset_cmd != cmd) {
+ pmcraid_err("reset is called with different command block\n");
+ pinstance->reset_cmd = cmd;
+ }
+
+ pmcraid_info("reset_engine: state = %d, command = %p\n",
+ pinstance->ioa_state, cmd);
+
+ switch (pinstance->ioa_state) {
+
+ case IOA_STATE_DEAD:
+ /* If IOA is offline, whatever may be the reset reason, just
+ * return. callers might be waiting on the reset wait_q, wake
+ * up them
+ */
+ pmcraid_err("IOA is offline no reset is possible\n");
+ reset_complete = 1;
+ break;
+
+ case IOA_STATE_IN_BRINGDOWN:
+ /* we enter here, once ioa shutdown command is processed by IOA
+ * Alert IOA for a possible reset. If reset alert fails, IOA
+ * goes through hard-reset
+ */
+ pmcraid_disable_interrupts(pinstance, ~0);
+ pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
+ pmcraid_reset_alert(cmd);
+ break;
+
+ case IOA_STATE_UNKNOWN:
+ /* We may be called during probe or resume. Some pre-processing
+ * is required for prior to reset
+ */
+ scsi_block_requests(pinstance->host);
+
+ /* If asked to reset while IOA was processing responses or
+ * there are any error responses then IOA may require
+ * hard-reset.
+ */
+ if (pinstance->ioa_hard_reset == 0) {
+ if (ioread32(pinstance->ioa_status) &
+ INTRS_TRANSITION_TO_OPERATIONAL) {
+ pmcraid_info("sticky bit set, bring-up\n");
+ pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
+ pmcraid_reinit_cmdblk(cmd);
+ pmcraid_identify_hrrq(cmd);
+ } else {
+ pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET;
+ pmcraid_soft_reset(cmd);
+ }
+ } else {
+ /* Alert IOA of a possible reset and wait for critical
+ * operation in progress bit to reset
+ */
+ pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
+ pmcraid_reset_alert(cmd);
+ }
+ break;
+
+ case IOA_STATE_IN_RESET_ALERT:
+ /* If critical operation in progress bit is reset or wait gets
+ * timed out, reset proceeds with starting BIST on the IOA.
+ * pmcraid_ioa_hard_reset keeps a count of reset attempts. If
+ * they are 3 or more, reset engine marks IOA dead and returns
+ */
+ pinstance->ioa_state = IOA_STATE_IN_HARD_RESET;
+ pmcraid_start_bist(cmd);
+ break;
+
+ case IOA_STATE_IN_HARD_RESET:
+ pinstance->ioa_reset_attempts++;
+
+ /* retry reset if we haven't reached maximum allowed limit */
+ if (pinstance->ioa_reset_attempts > PMCRAID_RESET_ATTEMPTS) {
+ pinstance->ioa_reset_attempts = 0;
+ pmcraid_err("IOA didn't respond marking it as dead\n");
+ pinstance->ioa_state = IOA_STATE_DEAD;
+ reset_complete = 1;
+ break;
+ }
+
+ /* Once either bist or pci reset is done, restore PCI config
+ * space. If this fails, proceed with hard reset again
+ */
+
+ if (pci_restore_state(pinstance->pdev)) {
+ pmcraid_info("config-space error resetting again\n");
+ pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
+ pmcraid_reset_alert(cmd);
+ break;
+ }
+
+ /* fail all pending commands */
+ pmcraid_fail_outstanding_cmds(pinstance);
+
+ /* check if unit check is active, if so extract dump */
+ if (pinstance->ioa_unit_check) {
+ pmcraid_info("unit check is active\n");
+ pinstance->ioa_unit_check = 0;
+ pmcraid_get_dump(pinstance);
+ pinstance->ioa_reset_attempts--;
+ pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
+ pmcraid_reset_alert(cmd);
+ break;
+ }
+
+ /* if the reset reason is to bring-down the ioa, we might be
+ * done with the reset restore pci_config_space and complete
+ * the reset
+ */
+ if (pinstance->ioa_bringdown) {
+ pmcraid_info("bringing down the adapter\n");
+ pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
+ pinstance->ioa_bringdown = 0;
+ pinstance->ioa_state = IOA_STATE_UNKNOWN;
+ reset_complete = 1;
+ } else {
+ /* bring-up IOA, so proceed with soft reset
+ * Reinitialize hrrq_buffers and their indices also
+ * enable interrupts after a pci_restore_state
+ */
+ if (pmcraid_reset_enable_ioa(pinstance)) {
+ pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
+ pmcraid_info("bringing up the adapter\n");
+ pmcraid_reinit_cmdblk(cmd);
+ pmcraid_identify_hrrq(cmd);
+ } else {
+ pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET;
+ pmcraid_soft_reset(cmd);
+ }
+ }
+ break;
+
+ case IOA_STATE_IN_SOFT_RESET:
+ /* TRANSITION TO OPERATIONAL is on so start initialization
+ * sequence
+ */
+ pmcraid_info("In softreset proceeding with bring-up\n");
+ pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
+
+ /* Initialization commands start with HRRQ identification. From
+ * now on tasklet completes most of the commands as IOA is up
+ * and intrs are enabled
+ */
+ pmcraid_identify_hrrq(cmd);
+ break;
+
+ case IOA_STATE_IN_BRINGUP:
+ /* we are done with bringing up of IOA, change the ioa_state to
+ * operational and wake up any waiters
+ */
+ pinstance->ioa_state = IOA_STATE_OPERATIONAL;
+ reset_complete = 1;
+ break;
+
+ case IOA_STATE_OPERATIONAL:
+ default:
+ /* When IOA is operational and a reset is requested, check for
+ * the reset reason. If reset is to bring down IOA, unregister
+ * HCAMs and initiate shutdown; if adapter reset is forced then
+ * restart reset sequence again
+ */
+ if (pinstance->ioa_shutdown_type == SHUTDOWN_NONE &&
+ pinstance->force_ioa_reset == 0) {
+ reset_complete = 1;
+ } else {
+ if (pinstance->ioa_shutdown_type != SHUTDOWN_NONE)
+ pinstance->ioa_state = IOA_STATE_IN_BRINGDOWN;
+ pmcraid_reinit_cmdblk(cmd);
+ pmcraid_unregister_hcams(cmd);
+ }
+ break;
+ }
+
+ /* reset will be completed if ioa_state is either DEAD or UNKNOWN or
+ * OPERATIONAL. Reset all control variables used during reset, wake up
+ * any waiting threads and let the SCSI mid-layer send commands. Note
+ * that host_lock must be held before invoking scsi_report_bus_reset.
+ */
+ if (reset_complete) {
+ pinstance->ioa_reset_in_progress = 0;
+ pinstance->ioa_reset_attempts = 0;
+ pinstance->reset_cmd = NULL;
+ pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
+ pinstance->ioa_bringdown = 0;
+ pmcraid_return_cmd(cmd);
+
+ /* If target state is to bring up the adapter, proceed with
+ * hcam registration and resource exposure to mid-layer.
+ */
+ if (pinstance->ioa_state == IOA_STATE_OPERATIONAL)
+ pmcraid_register_hcams(pinstance);
+
+ wake_up_all(&pinstance->reset_wait_q);
+ }
+
+ return;
+}
+
+/**
+ * pmcraid_initiate_reset - initiates reset sequence. This is called from
+ * ISR/tasklet during error interrupts including IOA unit check. If reset
+ * is already in progress, it just returns, otherwise initiates IOA reset
+ * to bring IOA up to operational state.
+ *
+ * @pinstance: pointer to adapter instance structure
+ *
+ * Return value
+ * none
+ */
+static void pmcraid_initiate_reset(struct pmcraid_instance *pinstance)
+{
+ struct pmcraid_cmd *cmd;
+
+ /* If the reset is already in progress, just return, otherwise start
+ * reset sequence and return
+ */
+ if (!pinstance->ioa_reset_in_progress) {
+ scsi_block_requests(pinstance->host);
+ cmd = pmcraid_get_free_cmd(pinstance);
+
+ if (cmd == NULL) {
+ pmcraid_err("no cmnd blocks for initiate_reset\n");
+ return;
+ }
+
+ pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
+ pinstance->reset_cmd = cmd;
+ pinstance->force_ioa_reset = 1;
+ pmcraid_ioa_reset(cmd);
+ }
+}
+
+/**
+ * pmcraid_reset_reload - utility routine for doing IOA reset either to bringup
+ * or bringdown IOA
+ * @pinstance: pointer adapter instance structure
+ * @shutdown_type: shutdown type to be used NONE, NORMAL or ABRREV
+ * @target_state: expected target state after reset
+ *
+ * Note: This command initiates reset and waits for its completion. Hence this
+ * should not be called from isr/timer/tasklet functions (timeout handlers,
+ * error response handlers and interrupt handlers).
+ *
+ * Return Value
+ * 1 in case ioa_state is not target_state, 0 otherwise.
+ */
+static int pmcraid_reset_reload(
+ struct pmcraid_instance *pinstance,
+ u8 shutdown_type,
+ u8 target_state
+)
+{
+ struct pmcraid_cmd *reset_cmd = NULL;
+ unsigned long lock_flags;
+ int reset = 1;
+
+ spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
+
+ if (pinstance->ioa_reset_in_progress) {
+ pmcraid_info("reset_reload: reset is already in progress\n");
+
+ spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
+
+ wait_event(pinstance->reset_wait_q,
+ !pinstance->ioa_reset_in_progress);
+
+ spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
+
+ if (pinstance->ioa_state == IOA_STATE_DEAD) {
+ spin_unlock_irqrestore(pinstance->host->host_lock,
+ lock_flags);
+ pmcraid_info("reset_reload: IOA is dead\n");
+ return reset;
+ } else if (pinstance->ioa_state == target_state) {
+ reset = 0;
+ }
+ }
+
+ if (reset) {
+ pmcraid_info("reset_reload: proceeding with reset\n");
+ scsi_block_requests(pinstance->host);
+ reset_cmd = pmcraid_get_free_cmd(pinstance);
+
+ if (reset_cmd == NULL) {
+ pmcraid_err("no free cmnd for reset_reload\n");
+ spin_unlock_irqrestore(pinstance->host->host_lock,
+ lock_flags);
+ return reset;
+ }
+
+ if (shutdown_type == SHUTDOWN_NORMAL)
+ pinstance->ioa_bringdown = 1;
+
+ pinstance->ioa_shutdown_type = shutdown_type;
+ pinstance->reset_cmd = reset_cmd;
+ pinstance->force_ioa_reset = reset;
+ pmcraid_info("reset_reload: initiating reset\n");
+ pmcraid_ioa_reset(reset_cmd);
+ spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
+ pmcraid_info("reset_reload: waiting for reset to complete\n");
+ wait_event(pinstance->reset_wait_q,
+ !pinstance->ioa_reset_in_progress);
+
+ pmcraid_info("reset_reload: reset is complete !! \n");
+ scsi_unblock_requests(pinstance->host);
+ if (pinstance->ioa_state == target_state)
+ reset = 0;
+ }
+
+ return reset;
+}
+
+/**
+ * pmcraid_reset_bringdown - wrapper over pmcraid_reset_reload to bringdown IOA
+ *
+ * @pinstance: pointer to adapter instance structure
+ *
+ * Return Value
+ * whatever is returned from pmcraid_reset_reload
+ */
+static int pmcraid_reset_bringdown(struct pmcraid_instance *pinstance)
+{
+ return pmcraid_reset_reload(pinstance,
+ SHUTDOWN_NORMAL,
+ IOA_STATE_UNKNOWN);
+}
+
+/**
+ * pmcraid_reset_bringup - wrapper over pmcraid_reset_reload to bring up IOA
+ *
+ * @pinstance: pointer to adapter instance structure
+ *
+ * Return Value
+ * whatever is returned from pmcraid_reset_reload
+ */
+static int pmcraid_reset_bringup(struct pmcraid_instance *pinstance)
+{
+ return pmcraid_reset_reload(pinstance,
+ SHUTDOWN_NONE,
+ IOA_STATE_OPERATIONAL);
+}
+
+/**
+ * pmcraid_request_sense - Send request sense to a device
+ * @cmd: pmcraid command struct
+ *
+ * This function sends a request sense to a device as a result of a check
+ * condition. This method re-uses the same command block that failed earlier.
+ */
+static void pmcraid_request_sense(struct pmcraid_cmd *cmd)
+{
+ struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
+ struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
+
+ /* allocate DMAable memory for sense buffers */
+ cmd->sense_buffer = pci_alloc_consistent(cmd->drv_inst->pdev,
+ SCSI_SENSE_BUFFERSIZE,
+ &cmd->sense_buffer_dma);
+
+ if (cmd->sense_buffer == NULL) {
+ pmcraid_err
+ ("couldn't allocate sense buffer for request sense\n");
+ pmcraid_erp_done(cmd);
+ return;
+ }
+
+ /* re-use the command block */
+ memset(&cmd->ioa_cb->ioasa, 0, sizeof(struct pmcraid_ioasa));
+ memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
+ ioarcb->request_flags0 = (SYNC_COMPLETE |
+ NO_LINK_DESCS |
+ INHIBIT_UL_CHECK);
+ ioarcb->request_type = REQ_TYPE_SCSI;
+ ioarcb->cdb[0] = REQUEST_SENSE;
+ ioarcb->cdb[4] = SCSI_SENSE_BUFFERSIZE;
+
+ ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
+ offsetof(struct pmcraid_ioarcb,
+ add_data.u.ioadl[0]));
+ ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
+
+ ioarcb->data_transfer_length = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);
+
+ ioadl->address = cpu_to_le64(cmd->sense_buffer_dma);
+ ioadl->data_len = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);
+ ioadl->flags = cpu_to_le32(IOADL_FLAGS_LAST_DESC);
+
+ /* request sense might be called as part of error response processing
+ * which runs in tasklets context. It is possible that mid-layer might
+ * schedule queuecommand during this time, hence, writting to IOARRIN
+ * must be protect by host_lock
+ */
+ pmcraid_send_cmd(cmd, pmcraid_erp_done,
+ PMCRAID_REQUEST_SENSE_TIMEOUT,
+ pmcraid_timeout_handler);
+}
+
+/**
+ * pmcraid_cancel_all - cancel all outstanding IOARCBs as part of error recovery
+ * @cmd: command that failed
+ * @sense: true if request_sense is required after cancel all
+ *
+ * This function sends a cancel all to a device to clear the queue.
+ */
+static void pmcraid_cancel_all(struct pmcraid_cmd *cmd, u32 sense)
+{
+ struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
+ struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
+ struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata;
+ void (*cmd_done) (struct pmcraid_cmd *) = sense ? pmcraid_erp_done
+ : pmcraid_request_sense;
+
+ memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
+ ioarcb->request_flags0 = SYNC_OVERRIDE;
+ ioarcb->request_type = REQ_TYPE_IOACMD;
+ ioarcb->cdb[0] = PMCRAID_CANCEL_ALL_REQUESTS;
+
+ if (RES_IS_GSCSI(res->cfg_entry))
+ ioarcb->cdb[1] = PMCRAID_SYNC_COMPLETE_AFTER_CANCEL;
+
+ ioarcb->ioadl_bus_addr = 0;
+ ioarcb->ioadl_length = 0;
+ ioarcb->data_transfer_length = 0;
+ ioarcb->ioarcb_bus_addr &= (~0x1FULL);
+
+ /* writing to IOARRIN must be protected by host_lock, as mid-layer
+ * schedule queuecommand while we are doing this
+ */
+ pmcraid_send_cmd(cmd, cmd_done,
+ PMCRAID_REQUEST_SENSE_TIMEOUT,
+ pmcraid_timeout_handler);
+}
+
+/**
+ * pmcraid_frame_auto_sense: frame fixed format sense information
+ *
+ * @cmd: pointer to failing command block
+ *
+ * Return value
+ * none
+ */
+static void pmcraid_frame_auto_sense(struct pmcraid_cmd *cmd)
+{
+ u8 *sense_buf = cmd->scsi_cmd->sense_buffer;
+ struct pmcraid_resource_entry *res = cmd->scsi_cmd->device->hostdata;
+ struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa;
+ u32 ioasc = le32_to_cpu(ioasa->ioasc);
+ u32 failing_lba = 0;
+
+ memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE);
+ cmd->scsi_cmd->result = SAM_STAT_CHECK_CONDITION;
+
+ if (RES_IS_VSET(res->cfg_entry) &&
+ ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC &&
+ ioasa->u.vset.failing_lba_hi != 0) {
+
+ sense_buf[0] = 0x72;
+ sense_buf[1] = PMCRAID_IOASC_SENSE_KEY(ioasc);
+ sense_buf[2] = PMCRAID_IOASC_SENSE_CODE(ioasc);
+ sense_buf[3] = PMCRAID_IOASC_SENSE_QUAL(ioasc);
+
+ sense_buf[7] = 12;
+ sense_buf[8] = 0;
+ sense_buf[9] = 0x0A;
+ sense_buf[10] = 0x80;
+
+ failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_hi);
+
+ sense_buf[12] = (failing_lba & 0xff000000) >> 24;
+ sense_buf[13] = (failing_lba & 0x00ff0000) >> 16;
+ sense_buf[14] = (failing_lba & 0x0000ff00) >> 8;
+ sense_buf[15] = failing_lba & 0x000000ff;
+
+ failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_lo);
+
+ sense_buf[16] = (failing_lba & 0xff000000) >> 24;
+ sense_buf[17] = (failing_lba & 0x00ff0000) >> 16;
+ sense_buf[18] = (failing_lba & 0x0000ff00) >> 8;
+ sense_buf[19] = failing_lba & 0x000000ff;
+ } else {
+ sense_buf[0] = 0x70;
+ sense_buf[2] = PMCRAID_IOASC_SENSE_KEY(ioasc);
+ sense_buf[12] = PMCRAID_IOASC_SENSE_CODE(ioasc);
+ sense_buf[13] = PMCRAID_IOASC_SENSE_QUAL(ioasc);
+
+ if (ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC) {
+ if (RES_IS_VSET(res->cfg_entry))
+ failing_lba =
+ le32_to_cpu(ioasa->u.
+ vset.failing_lba_lo);
+ sense_buf[0] |= 0x80;
+ sense_buf[3] = (failing_lba >> 24) & 0xff;
+ sense_buf[4] = (failing_lba >> 16) & 0xff;
+ sense_buf[5] = (failing_lba >> 8) & 0xff;
+ sense_buf[6] = failing_lba & 0xff;
+ }
+
+ sense_buf[7] = 6; /* additional length */
+ }
+}
+
+/**
+ * pmcraid_error_handler - Error response handlers for a SCSI op
+ * @cmd: pointer to pmcraid_cmd that has failed
+ *
+ * This function determines whether or not to initiate ERP on the affected
+ * device. This is called from a tasklet, which doesn't hold any locks.
+ *
+ * Return value:
+ * 0 it caller can complete the request, otherwise 1 where in error
+ * handler itself completes the request and returns the command block
+ * back to free-pool
+ */
+static int pmcraid_error_handler(struct pmcraid_cmd *cmd)
+{
+ struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
+ struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata;
+ struct pmcraid_instance *pinstance = cmd->drv_inst;
+ struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa;
+ u32 ioasc = le32_to_cpu(ioasa->ioasc);
+ u32 masked_ioasc = ioasc & PMCRAID_IOASC_SENSE_MASK;
+ u32 sense_copied = 0;
+
+ if (!res) {
+ pmcraid_info("resource pointer is NULL\n");
+ return 0;
+ }
+
+ /* If this was a SCSI read/write command keep count of errors */
+ if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_READ_CMD)
+ atomic_inc(&res->read_failures);
+ else if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_WRITE_CMD)
+ atomic_inc(&res->write_failures);
+
+ if (!RES_IS_GSCSI(res->cfg_entry) &&
+ masked_ioasc != PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR) {
+ pmcraid_frame_auto_sense(cmd);
+ }
+
+ /* Log IOASC/IOASA information based on user settings */
+ pmcraid_ioasc_logger(ioasc, cmd);
+
+ switch (masked_ioasc) {
+
+ case PMCRAID_IOASC_AC_TERMINATED_BY_HOST:
+ scsi_cmd->result |= (DID_ABORT << 16);
+ break;
+
+ case PMCRAID_IOASC_IR_INVALID_RESOURCE_HANDLE:
+ case PMCRAID_IOASC_HW_CANNOT_COMMUNICATE:
+ scsi_cmd->result |= (DID_NO_CONNECT << 16);
+ break;
+
+ case PMCRAID_IOASC_NR_SYNC_REQUIRED:
+ res->sync_reqd = 1;
+ scsi_cmd->result |= (DID_IMM_RETRY << 16);
+ break;
+
+ case PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC:
+ scsi_cmd->result |= (DID_PASSTHROUGH << 16);
+ break;
+
+ case PMCRAID_IOASC_UA_BUS_WAS_RESET:
+ case PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER:
+ if (!res->reset_progress)
+ scsi_report_bus_reset(pinstance->host,
+ scsi_cmd->device->channel);
+ scsi_cmd->result |= (DID_ERROR << 16);
+ break;
+
+ case PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR:
+ scsi_cmd->result |= PMCRAID_IOASC_SENSE_STATUS(ioasc);
+ res->sync_reqd = 1;
+
+ /* if check_condition is not active return with error otherwise
+ * get/frame the sense buffer
+ */
+ if (PMCRAID_IOASC_SENSE_STATUS(ioasc) !=
+ SAM_STAT_CHECK_CONDITION &&
+ PMCRAID_IOASC_SENSE_STATUS(ioasc) != SAM_STAT_ACA_ACTIVE)
+ return 0;
+
+ /* If we have auto sense data as part of IOASA pass it to
+ * mid-layer
+ */
+ if (ioasa->auto_sense_length != 0) {
+ short sense_len = ioasa->auto_sense_length;
+ int data_size = min_t(u16, le16_to_cpu(sense_len),
+ SCSI_SENSE_BUFFERSIZE);
+
+ memcpy(scsi_cmd->sense_buffer,
+ ioasa->sense_data,
+ data_size);
+ sense_copied = 1;
+ }
+
+ if (RES_IS_GSCSI(res->cfg_entry)) {
+ pmcraid_cancel_all(cmd, sense_copied);
+ } else if (sense_copied) {
+ pmcraid_erp_done(cmd);
+ return 0;
+ } else {
+ pmcraid_request_sense(cmd);
+ }
+
+ return 1;
+
+ case PMCRAID_IOASC_NR_INIT_CMD_REQUIRED:
+ break;
+
+ default:
+ if (PMCRAID_IOASC_SENSE_KEY(ioasc) > RECOVERED_ERROR)
+ scsi_cmd->result |= (DID_ERROR << 16);
+ break;
+ }
+ return 0;
+}
+
+/**
+ * pmcraid_reset_device - device reset handler functions
+ *
+ * @scsi_cmd: scsi command struct
+ * @modifier: reset modifier indicating the reset sequence to be performed
+ *
+ * This function issues a device reset to the affected device.
+ * A LUN reset will be sent to the device first. If that does
+ * not work, a target reset will be sent.
+ *
+ * Return value:
+ * SUCCESS / FAILED
+ */
+static int pmcraid_reset_device(
+ struct scsi_cmnd *scsi_cmd,
+ unsigned long timeout,
+ u8 modifier
+)
+{
+ struct pmcraid_cmd *cmd;
+ struct pmcraid_instance *pinstance;
+ struct pmcraid_resource_entry *res;
+ struct pmcraid_ioarcb *ioarcb;
+ unsigned long lock_flags;
+ u32 ioasc;
+
+ pinstance =
+ (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
+ res = scsi_cmd->device->hostdata;
+
+ if (!res) {
+ pmcraid_err("reset_device: NULL resource pointer\n");
+ return FAILED;
+ }
+
+ /* If adapter is currently going through reset/reload, return failed.
+ * This will force the mid-layer to call _eh_bus/host reset, which
+ * will then go to sleep and wait for the reset to complete
+ */
+ spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
+ if (pinstance->ioa_reset_in_progress ||
+ pinstance->ioa_state == IOA_STATE_DEAD) {
+ spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
+ return FAILED;
+ }
+
+ res->reset_progress = 1;
+ pmcraid_info("Resetting %s resource with addr %x\n",
+ ((modifier & RESET_DEVICE_LUN) ? "LUN" :
+ ((modifier & RESET_DEVICE_TARGET) ? "TARGET" : "BUS")),
+ le32_to_cpu(res->cfg_entry.resource_address));
+
+ /* get a free cmd block */
+ cmd = pmcraid_get_free_cmd(pinstance);
+
+ if (cmd == NULL) {
+ spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
+ pmcraid_err("%s: no cmd blocks are available\n", __func__);
+ return FAILED;
+ }
+
+ ioarcb = &cmd->ioa_cb->ioarcb;
+ ioarcb->resource_handle = res->cfg_entry.resource_handle;
+ ioarcb->request_type = REQ_TYPE_IOACMD;
+ ioarcb->cdb[0] = PMCRAID_RESET_DEVICE;
+
+ /* Initialize reset modifier bits */
+ if (modifier)
+ modifier = ENABLE_RESET_MODIFIER | modifier;
+
+ ioarcb->cdb[1] = modifier;
+
+ init_completion(&cmd->wait_for_completion);
+ cmd->completion_req = 1;
+
+ pmcraid_info("cmd(CDB[0] = %x) for %x with index = %d\n",
+ cmd->ioa_cb->ioarcb.cdb[0],
+ le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle),
+ le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2);
+
+ pmcraid_send_cmd(cmd,
+ pmcraid_internal_done,
+ timeout,
+ pmcraid_timeout_handler);
+
+ spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
+
+ /* RESET_DEVICE command completes after all pending IOARCBs are
+ * completed. Once this command is completed, pmcraind_internal_done
+ * will wake up the 'completion' queue.
+ */
+ wait_for_completion(&cmd->wait_for_completion);
+
+ /* complete the command here itself and return the command block
+ * to free list
+ */
+ pmcraid_return_cmd(cmd);
+ res->reset_progress = 0;
+ ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
+
+ /* set the return value based on the returned ioasc */
+ return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS;
+}
+
+/**
+ * _pmcraid_io_done - helper for pmcraid_io_done function
+ *
+ * @cmd: pointer to pmcraid command struct
+ * @reslen: residual data length to be set in the ioasa
+ * @ioasc: ioasc either returned by IOA or set by driver itself.
+ *
+ * This function is invoked by pmcraid_io_done to complete mid-layer
+ * scsi ops.
+ *
+ * Return value:
+ * 0 if caller is required to return it to free_pool. Returns 1 if
+ * caller need not worry about freeing command block as error handler
+ * will take care of that.
+ */
+
+static int _pmcraid_io_done(struct pmcraid_cmd *cmd, int reslen, int ioasc)
+{
+ struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
+ int rc = 0;
+
+ scsi_set_resid(scsi_cmd, reslen);
+
+ pmcraid_info("response(%d) CDB[0] = %x ioasc:result: %x:%x\n",
+ le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2,
+ cmd->ioa_cb->ioarcb.cdb[0],
+ ioasc, scsi_cmd->result);
+
+ if (PMCRAID_IOASC_SENSE_KEY(ioasc) != 0)
+ rc = pmcraid_error_handler(cmd);
+
+ if (rc == 0) {
+ scsi_dma_unmap(scsi_cmd);
+ scsi_cmd->scsi_done(scsi_cmd);
+ }
+
+ return rc;
+}
+
+/**
+ * pmcraid_io_done - SCSI completion function
+ *
+ * @cmd: pointer to pmcraid command struct
+ *
+ * This function is invoked by tasklet/mid-layer error handler to completing
+ * the SCSI ops sent from mid-layer.
+ *
+ * Return value
+ * none
+ */
+
+static void pmcraid_io_done(struct pmcraid_cmd *cmd)
+{
+ u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
+ u32 reslen = le32_to_cpu(cmd->ioa_cb->ioasa.residual_data_length);
+
+ if (_pmcraid_io_done(cmd, reslen, ioasc) == 0)
+ pmcraid_return_cmd(cmd);
+}
+
+/**
+ * pmcraid_abort_cmd - Aborts a single IOARCB already submitted to IOA
+ *
+ * @cmd: command block of the command to be aborted
+ *
+ * Return Value:
+ * returns pointer to command structure used as cancelling cmd
+ */
+static struct pmcraid_cmd *pmcraid_abort_cmd(struct pmcraid_cmd *cmd)
+{
+ struct pmcraid_cmd *cancel_cmd;
+ struct pmcraid_instance *pinstance;
+ struct pmcraid_resource_entry *res;
+
+ pinstance = (struct pmcraid_instance *)cmd->drv_inst;
+ res = cmd->scsi_cmd->device->hostdata;
+
+ cancel_cmd = pmcraid_get_free_cmd(pinstance);
+
+ if (cancel_cmd == NULL) {
+ pmcraid_err("%s: no cmd blocks are available\n", __func__);
+ return NULL;
+ }
+
+ pmcraid_prepare_cancel_cmd(cancel_cmd, cmd);
+
+ pmcraid_info("aborting command CDB[0]= %x with index = %d\n",
+ cmd->ioa_cb->ioarcb.cdb[0],
+ cmd->ioa_cb->ioarcb.response_handle >> 2);
+
+ init_completion(&cancel_cmd->wait_for_completion);
+ cancel_cmd->completion_req = 1;
+
+ pmcraid_info("command (%d) CDB[0] = %x for %x\n",
+ le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.response_handle) >> 2,
+ cmd->ioa_cb->ioarcb.cdb[0],
+ le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.resource_handle));
+
+ pmcraid_send_cmd(cancel_cmd,
+ pmcraid_internal_done,
+ PMCRAID_INTERNAL_TIMEOUT,
+ pmcraid_timeout_handler);
+ return cancel_cmd;
+}
+
+/**
+ * pmcraid_abort_complete - Waits for ABORT TASK completion
+ *
+ * @cancel_cmd: command block use as cancelling command
+ *
+ * Return Value:
+ * returns SUCCESS if ABORT TASK has good completion
+ * otherwise FAILED
+ */
+static int pmcraid_abort_complete(struct pmcraid_cmd *cancel_cmd)
+{
+ struct pmcraid_resource_entry *res;
+ u32 ioasc;
+
+ wait_for_completion(&cancel_cmd->wait_for_completion);
+ res = cancel_cmd->u.res;
+ cancel_cmd->u.res = NULL;
+ ioasc = le32_to_cpu(cancel_cmd->ioa_cb->ioasa.ioasc);
+
+ /* If the abort task is not timed out we will get a Good completion
+ * as sense_key, otherwise we may get one the following responses
+ * due to subsquent bus reset or device reset. In case IOASC is
+ * NR_SYNC_REQUIRED, set sync_reqd flag for the corresponding resource
+ */
+ if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET ||
+ ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED) {
+ if (ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED)
+ res->sync_reqd = 1;
+ ioasc = 0;
+ }
+
+ /* complete the command here itself */
+ pmcraid_return_cmd(cancel_cmd);
+ return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS;
+}
+
+/**
+ * pmcraid_eh_abort_handler - entry point for aborting a single task on errors
+ *
+ * @scsi_cmd: scsi command struct given by mid-layer. When this is called
+ * mid-layer ensures that no other commands are queued. This
+ * never gets called under interrupt, but a separate eh thread.
+ *
+ * Return value:
+ * SUCCESS / FAILED
+ */
+static int pmcraid_eh_abort_handler(struct scsi_cmnd *scsi_cmd)
+{
+ struct pmcraid_instance *pinstance;
+ struct pmcraid_cmd *cmd;
+ struct pmcraid_resource_entry *res;
+ unsigned long host_lock_flags;
+ unsigned long pending_lock_flags;
+ struct pmcraid_cmd *cancel_cmd = NULL;
+ int cmd_found = 0;
+ int rc = FAILED;
+
+ pinstance =
+ (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
+
+ dev_err(&pinstance->pdev->dev,
+ "I/O command timed out, aborting it.\n");
+
+ res = scsi_cmd->device->hostdata;
+
+ if (res == NULL)
+ return rc;
+
+ /* If we are currently going through reset/reload, return failed.
+ * This will force the mid-layer to eventually call
+ * pmcraid_eh_host_reset which will then go to sleep and wait for the
+ * reset to complete
+ */
+ spin_lock_irqsave(pinstance->host->host_lock, host_lock_flags);
+
+ if (pinstance->ioa_reset_in_progress ||
+ pinstance->ioa_state == IOA_STATE_DEAD) {
+ spin_unlock_irqrestore(pinstance->host->host_lock,
+ host_lock_flags);
+ return rc;
+ }
+
+ /* loop over pending cmd list to find cmd corresponding to this
+ * scsi_cmd. Note that this command might not have been completed
+ * already. locking: all pending commands are protected with
+ * pending_pool_lock.
+ */
+ spin_lock_irqsave(&pinstance->pending_pool_lock, pending_lock_flags);
+ list_for_each_entry(cmd, &pinstance->pending_cmd_pool, free_list) {
+
+ if (cmd->scsi_cmd == scsi_cmd) {
+ cmd_found = 1;
+ break;
+ }
+ }
+
+ spin_unlock_irqrestore(&pinstance->pending_pool_lock,
+ pending_lock_flags);
+
+ /* If the command to be aborted was given to IOA and still pending with
+ * it, send ABORT_TASK to abort this and wait for its completion
+ */
+ if (cmd_found)
+ cancel_cmd = pmcraid_abort_cmd(cmd);
+
+ spin_unlock_irqrestore(pinstance->host->host_lock,
+ host_lock_flags);
+
+ if (cancel_cmd) {
+ cancel_cmd->u.res = cmd->scsi_cmd->device->hostdata;
+ rc = pmcraid_abort_complete(cancel_cmd);
+ }
+
+ return cmd_found ? rc : SUCCESS;
+}
+
+/**
+ * pmcraid_eh_xxxx_reset_handler - bus/target/device reset handler callbacks
+ *
+ * @scmd: pointer to scsi_cmd that was sent to the resource to be reset.
+ *
+ * All these routines invokve pmcraid_reset_device with appropriate parameters.
+ * Since these are called from mid-layer EH thread, no other IO will be queued
+ * to the resource being reset. However, control path (IOCTL) may be active so
+ * it is necessary to synchronize IOARRIN writes which pmcraid_reset_device
+ * takes care by locking/unlocking host_lock.
+ *
+ * Return value
+ * SUCCESS or FAILED
+ */
+static int pmcraid_eh_device_reset_handler(struct scsi_cmnd *scmd)
+{
+ pmcraid_err("Doing device reset due to an I/O command timeout.\n");
+ return pmcraid_reset_device(scmd,
+ PMCRAID_INTERNAL_TIMEOUT,
+ RESET_DEVICE_LUN);
+}
+
+static int pmcraid_eh_bus_reset_handler(struct scsi_cmnd *scmd)
+{
+ pmcraid_err("Doing bus reset due to an I/O command timeout.\n");
+ return pmcraid_reset_device(scmd,
+ PMCRAID_RESET_BUS_TIMEOUT,
+ RESET_DEVICE_BUS);
+}
+
+static int pmcraid_eh_target_reset_handler(struct scsi_cmnd *scmd)
+{
+ pmcraid_err("Doing target reset due to an I/O command timeout.\n");
+ return pmcraid_reset_device(scmd,
+ PMCRAID_INTERNAL_TIMEOUT,
+ RESET_DEVICE_TARGET);
+}
+
+/**
+ * pmcraid_eh_host_reset_handler - adapter reset handler callback
+ *
+ * @scmd: pointer to scsi_cmd that was sent to a resource of adapter
+ *
+ * Initiates adapter reset to bring it up to operational state
+ *
+ * Return value
+ * SUCCESS or FAILED
+ */
+static int pmcraid_eh_host_reset_handler(struct scsi_cmnd *scmd)
+{
+ unsigned long interval = 10000; /* 10 seconds interval */
+ int waits = jiffies_to_msecs(PMCRAID_RESET_HOST_TIMEOUT) / interval;
+ struct pmcraid_instance *pinstance =
+ (struct pmcraid_instance *)(scmd->device->host->hostdata);
+
+
+ /* wait for an additional 150 seconds just in case firmware could come
+ * up and if it could complete all the pending commands excluding the
+ * two HCAM (CCN and LDN).
+ */
+ while (waits--) {
+ if (atomic_read(&pinstance->outstanding_cmds) <=
+ PMCRAID_MAX_HCAM_CMD)
+ return SUCCESS;
+ msleep(interval);
+ }
+
+ dev_err(&pinstance->pdev->dev,
+ "Adapter being reset due to an I/O command timeout.\n");
+ return pmcraid_reset_bringup(pinstance) == 0 ? SUCCESS : FAILED;
+}
+
+/**
+ * pmcraid_task_attributes - Translate SPI Q-Tags to task attributes
+ * @scsi_cmd: scsi command struct
+ *
+ * Return value
+ * number of tags or 0 if the task is not tagged
+ */
+static u8 pmcraid_task_attributes(struct scsi_cmnd *scsi_cmd)
+{
+ char tag[2];
+ u8 rc = 0;
+
+ if (scsi_populate_tag_msg(scsi_cmd, tag)) {
+ switch (tag[0]) {
+ case MSG_SIMPLE_TAG:
+ rc = TASK_TAG_SIMPLE;
+ break;
+ case MSG_HEAD_TAG:
+ rc = TASK_TAG_QUEUE_HEAD;
+ break;
+ case MSG_ORDERED_TAG:
+ rc = TASK_TAG_ORDERED;
+ break;
+ };
+ }
+
+ return rc;
+}
+
+
+/**
+ * pmcraid_init_ioadls - initializes IOADL related fields in IOARCB
+ * @cmd: pmcraid command struct
+ * @sgcount: count of scatter-gather elements
+ *
+ * Return value
+ * returns pointer pmcraid_ioadl_desc, initialized to point to internal
+ * or external IOADLs
+ */
+struct pmcraid_ioadl_desc *
+pmcraid_init_ioadls(struct pmcraid_cmd *cmd, int sgcount)
+{
+ struct pmcraid_ioadl_desc *ioadl;
+ struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
+ int ioadl_count = 0;
+
+ if (ioarcb->add_cmd_param_length)
+ ioadl_count = DIV_ROUND_UP(ioarcb->add_cmd_param_length, 16);
+ ioarcb->ioadl_length =
+ sizeof(struct pmcraid_ioadl_desc) * sgcount;
+
+ if ((sgcount + ioadl_count) > (ARRAY_SIZE(ioarcb->add_data.u.ioadl))) {
+ /* external ioadls start at offset 0x80 from control_block
+ * structure, re-using 24 out of 27 ioadls part of IOARCB.
+ * It is necessary to indicate to firmware that driver is
+ * using ioadls to be treated as external to IOARCB.
+ */
+ ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
+ ioarcb->ioadl_bus_addr =
+ cpu_to_le64((cmd->ioa_cb_bus_addr) +
+ offsetof(struct pmcraid_ioarcb,
+ add_data.u.ioadl[3]));
+ ioadl = &ioarcb->add_data.u.ioadl[3];
+ } else {
+ ioarcb->ioadl_bus_addr =
+ cpu_to_le64((cmd->ioa_cb_bus_addr) +
+ offsetof(struct pmcraid_ioarcb,
+ add_data.u.ioadl[ioadl_count]));
+
+ ioadl = &ioarcb->add_data.u.ioadl[ioadl_count];
+ ioarcb->ioarcb_bus_addr |=
+ DIV_ROUND_CLOSEST(sgcount + ioadl_count, 8);
+ }
+
+ return ioadl;
+}
+
+/**
+ * pmcraid_build_ioadl - Build a scatter/gather list and map the buffer
+ * @pinstance: pointer to adapter instance structure
+ * @cmd: pmcraid command struct
+ *
+ * This function is invoked by queuecommand entry point while sending a command
+ * to firmware. This builds ioadl descriptors and sets up ioarcb fields.
+ *
+ * Return value:
+ * 0 on success or -1 on failure
+ */
+static int pmcraid_build_ioadl(
+ struct pmcraid_instance *pinstance,
+ struct pmcraid_cmd *cmd
+)
+{
+ int i, nseg;
+ struct scatterlist *sglist;
+
+ struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
+ struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb);
+ struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
+
+ u32 length = scsi_bufflen(scsi_cmd);
+
+ if (!length)
+ return 0;
+
+ nseg = scsi_dma_map(scsi_cmd);
+
+ if (nseg < 0) {
+ dev_err(&pinstance->pdev->dev, "scsi_map_dma failed!\n");
+ return -1;
+ } else if (nseg > PMCRAID_MAX_IOADLS) {
+ scsi_dma_unmap(scsi_cmd);
+ dev_err(&pinstance->pdev->dev,
+ "sg count is (%d) more than allowed!\n", nseg);
+ return -1;
+ }
+
+ /* Initialize IOARCB data transfer length fields */
+ if (scsi_cmd->sc_data_direction == DMA_TO_DEVICE)
+ ioarcb->request_flags0 |= TRANSFER_DIR_WRITE;
+
+ ioarcb->request_flags0 |= NO_LINK_DESCS;
+ ioarcb->data_transfer_length = cpu_to_le32(length);
+ ioadl = pmcraid_init_ioadls(cmd, nseg);
+
+ /* Initialize IOADL descriptor addresses */
+ scsi_for_each_sg(scsi_cmd, sglist, nseg, i) {
+ ioadl[i].data_len = cpu_to_le32(sg_dma_len(sglist));
+ ioadl[i].address = cpu_to_le64(sg_dma_address(sglist));
+ ioadl[i].flags = 0;
+ }
+ /* setup last descriptor */
+ ioadl[i - 1].flags = cpu_to_le32(IOADL_FLAGS_LAST_DESC);
+
+ return 0;
+}
+
+/**
+ * pmcraid_free_sglist - Frees an allocated SG buffer list
+ * @sglist: scatter/gather list pointer
+ *
+ * Free a DMA'able memory previously allocated with pmcraid_alloc_sglist
+ *
+ * Return value:
+ * none
+ */
+static void pmcraid_free_sglist(struct pmcraid_sglist *sglist)
+{
+ int i;
+
+ for (i = 0; i < sglist->num_sg; i++)
+ __free_pages(sg_page(&(sglist->scatterlist[i])),
+ sglist->order);
+
+ kfree(sglist);
+}
+
+/**
+ * pmcraid_alloc_sglist - Allocates memory for a SG list
+ * @buflen: buffer length
+ *
+ * Allocates a DMA'able buffer in chunks and assembles a scatter/gather
+ * list.
+ *
+ * Return value
+ * pointer to sglist / NULL on failure
+ */
+static struct pmcraid_sglist *pmcraid_alloc_sglist(int buflen)
+{
+ struct pmcraid_sglist *sglist;
+ struct scatterlist *scatterlist;
+ struct page *page;
+ int num_elem, i, j;
+ int sg_size;
+ int order;
+ int bsize_elem;
+
+ sg_size = buflen / (PMCRAID_MAX_IOADLS - 1);
+ order = (sg_size > 0) ? get_order(sg_size) : 0;
+ bsize_elem = PAGE_SIZE * (1 << order);
+
+ /* Determine the actual number of sg entries needed */
+ if (buflen % bsize_elem)
+ num_elem = (buflen / bsize_elem) + 1;
+ else
+ num_elem = buflen / bsize_elem;
+
+ /* Allocate a scatter/gather list for the DMA */
+ sglist = kzalloc(sizeof(struct pmcraid_sglist) +
+ (sizeof(struct scatterlist) * (num_elem - 1)),
+ GFP_KERNEL);
+
+ if (sglist == NULL)
+ return NULL;
+
+ scatterlist = sglist->scatterlist;
+ sg_init_table(scatterlist, num_elem);
+ sglist->order = order;
+ sglist->num_sg = num_elem;
+ sg_size = buflen;
+
+ for (i = 0; i < num_elem; i++) {
+ page = alloc_pages(GFP_KERNEL|GFP_DMA, order);
+ if (!page) {
+ for (j = i - 1; j >= 0; j--)
+ __free_pages(sg_page(&scatterlist[j]), order);
+ kfree(sglist);
+ return NULL;
+ }
+
+ sg_set_page(&scatterlist[i], page,
+ sg_size < bsize_elem ? sg_size : bsize_elem, 0);
+ sg_size -= bsize_elem;
+ }
+
+ return sglist;
+}
+
+/**
+ * pmcraid_copy_sglist - Copy user buffer to kernel buffer's SG list
+ * @sglist: scatter/gather list pointer
+ * @buffer: buffer pointer
+ * @len: buffer length
+ * @direction: data transfer direction
+ *
+ * Copy a user buffer into a buffer allocated by pmcraid_alloc_sglist
+ *
+ * Return value:
+ * 0 on success / other on failure
+ */
+static int pmcraid_copy_sglist(
+ struct pmcraid_sglist *sglist,
+ unsigned long buffer,
+ u32 len,
+ int direction
+)
+{
+ struct scatterlist *scatterlist;
+ void *kaddr;
+ int bsize_elem;
+ int i;
+ int rc = 0;
+
+ /* Determine the actual number of bytes per element */
+ bsize_elem = PAGE_SIZE * (1 << sglist->order);
+
+ scatterlist = sglist->scatterlist;
+
+ for (i = 0; i < (len / bsize_elem); i++, buffer += bsize_elem) {
+ struct page *page = sg_page(&scatterlist[i]);
+
+ kaddr = kmap(page);
+ if (direction == DMA_TO_DEVICE)
+ rc = __copy_from_user(kaddr,
+ (void *)buffer,
+ bsize_elem);
+ else
+ rc = __copy_to_user((void *)buffer, kaddr, bsize_elem);
+
+ kunmap(page);
+
+ if (rc) {
+ pmcraid_err("failed to copy user data into sg list\n");
+ return -EFAULT;
+ }
+
+ scatterlist[i].length = bsize_elem;
+ }
+
+ if (len % bsize_elem) {
+ struct page *page = sg_page(&scatterlist[i]);
+
+ kaddr = kmap(page);
+
+ if (direction == DMA_TO_DEVICE)
+ rc = __copy_from_user(kaddr,
+ (void *)buffer,
+ len % bsize_elem);
+ else
+ rc = __copy_to_user((void *)buffer,
+ kaddr,
+ len % bsize_elem);
+
+ kunmap(page);
+
+ scatterlist[i].length = len % bsize_elem;
+ }
+
+ if (rc) {
+ pmcraid_err("failed to copy user data into sg list\n");
+ rc = -EFAULT;
+ }
+
+ return rc;
+}
+
+/**
+ * pmcraid_queuecommand - Queue a mid-layer request
+ * @scsi_cmd: scsi command struct
+ * @done: done function
+ *
+ * This function queues a request generated by the mid-layer. Midlayer calls
+ * this routine within host->lock. Some of the functions called by queuecommand
+ * would use cmd block queue locks (free_pool_lock and pending_pool_lock)
+ *
+ * Return value:
+ * 0 on success
+ * SCSI_MLQUEUE_DEVICE_BUSY if device is busy
+ * SCSI_MLQUEUE_HOST_BUSY if host is busy
+ */
+static int pmcraid_queuecommand(
+ struct scsi_cmnd *scsi_cmd,
+ void (*done) (struct scsi_cmnd *)
+)
+{
+ struct pmcraid_instance *pinstance;
+ struct pmcraid_resource_entry *res;
+ struct pmcraid_ioarcb *ioarcb;
+ struct pmcraid_cmd *cmd;
+ int rc = 0;
+
+ pinstance =
+ (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
+
+ scsi_cmd->scsi_done = done;
+ res = scsi_cmd->device->hostdata;
+ scsi_cmd->result = (DID_OK << 16);
+
+ /* if adapter is marked as dead, set result to DID_NO_CONNECT complete
+ * the command
+ */
+ if (pinstance->ioa_state == IOA_STATE_DEAD) {
+ pmcraid_info("IOA is dead, but queuecommand is scheduled\n");
+ scsi_cmd->result = (DID_NO_CONNECT << 16);
+ scsi_cmd->scsi_done(scsi_cmd);
+ return 0;
+ }
+
+ /* If IOA reset is in progress, can't queue the commands */
+ if (pinstance->ioa_reset_in_progress)
+ return SCSI_MLQUEUE_HOST_BUSY;
+
+ /* initialize the command and IOARCB to be sent to IOA */
+ cmd = pmcraid_get_free_cmd(pinstance);
+
+ if (cmd == NULL) {
+ pmcraid_err("free command block is not available\n");
+ return SCSI_MLQUEUE_HOST_BUSY;
+ }
+
+ cmd->scsi_cmd = scsi_cmd;
+ ioarcb = &(cmd->ioa_cb->ioarcb);
+ memcpy(ioarcb->cdb, scsi_cmd->cmnd, scsi_cmd->cmd_len);
+ ioarcb->resource_handle = res->cfg_entry.resource_handle;
+ ioarcb->request_type = REQ_TYPE_SCSI;
+
+ cmd->cmd_done = pmcraid_io_done;
+
+ if (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry)) {
+ if (scsi_cmd->underflow == 0)
+ ioarcb->request_flags0 |= INHIBIT_UL_CHECK;
+
+ if (res->sync_reqd) {
+ ioarcb->request_flags0 |= SYNC_COMPLETE;
+ res->sync_reqd = 0;
+ }
+
+ ioarcb->request_flags0 |= NO_LINK_DESCS;
+ ioarcb->request_flags1 |= pmcraid_task_attributes(scsi_cmd);
+
+ if (RES_IS_GSCSI(res->cfg_entry))
+ ioarcb->request_flags1 |= DELAY_AFTER_RESET;
+ }
+
+ rc = pmcraid_build_ioadl(pinstance, cmd);
+
+ pmcraid_info("command (%d) CDB[0] = %x for %x:%x:%x:%x\n",
+ le32_to_cpu(ioarcb->response_handle) >> 2,
+ scsi_cmd->cmnd[0], pinstance->host->unique_id,
+ RES_IS_VSET(res->cfg_entry) ? PMCRAID_VSET_BUS_ID :
+ PMCRAID_PHYS_BUS_ID,
+ RES_IS_VSET(res->cfg_entry) ?
+ res->cfg_entry.unique_flags1 :
+ RES_TARGET(res->cfg_entry.resource_address),
+ RES_LUN(res->cfg_entry.resource_address));
+
+ if (likely(rc == 0)) {
+ _pmcraid_fire_command(cmd);
+ } else {
+ pmcraid_err("queuecommand could not build ioadl\n");
+ pmcraid_return_cmd(cmd);
+ rc = SCSI_MLQUEUE_HOST_BUSY;
+ }
+
+ return rc;
+}
+
+/**
+ * pmcraid_open -char node "open" entry, allowed only users with admin access
+ */
+static int pmcraid_chr_open(struct inode *inode, struct file *filep)
+{
+ struct pmcraid_instance *pinstance;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+
+ /* Populate adapter instance * pointer for use by ioctl */
+ pinstance = container_of(inode->i_cdev, struct pmcraid_instance, cdev);
+ filep->private_data = pinstance;
+
+ return 0;
+}
+
+/**
+ * pmcraid_release - char node "release" entry point
+ */
+static int pmcraid_chr_release(struct inode *inode, struct file *filep)
+{
+ struct pmcraid_instance *pinstance =
+ ((struct pmcraid_instance *)filep->private_data);
+
+ filep->private_data = NULL;
+ fasync_helper(-1, filep, 0, &pinstance->aen_queue);
+
+ return 0;
+}
+
+/**
+ * pmcraid_fasync - Async notifier registration from applications
+ *
+ * This function adds the calling process to a driver global queue. When an
+ * event occurs, SIGIO will be sent to all processes in this queue.
+ */
+static int pmcraid_chr_fasync(int fd, struct file *filep, int mode)
+{
+ struct pmcraid_instance *pinstance;
+ int rc;
+
+ pinstance = (struct pmcraid_instance *)filep->private_data;
+ mutex_lock(&pinstance->aen_queue_lock);
+ rc = fasync_helper(fd, filep, mode, &pinstance->aen_queue);
+ mutex_unlock(&pinstance->aen_queue_lock);
+
+ return rc;
+}
+
+
+/**
+ * pmcraid_build_passthrough_ioadls - builds SG elements for passthrough
+ * commands sent over IOCTL interface
+ *
+ * @cmd : pointer to struct pmcraid_cmd
+ * @buflen : length of the request buffer
+ * @direction : data transfer direction
+ *
+ * Return value
+ * 0 on sucess, non-zero error code on failure
+ */
+static int pmcraid_build_passthrough_ioadls(
+ struct pmcraid_cmd *cmd,
+ int buflen,
+ int direction
+)
+{
+ struct pmcraid_sglist *sglist = NULL;
+ struct scatterlist *sg = NULL;
+ struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
+ struct pmcraid_ioadl_desc *ioadl;
+ int i;
+
+ sglist = pmcraid_alloc_sglist(buflen);
+
+ if (!sglist) {
+ pmcraid_err("can't allocate memory for passthrough SGls\n");
+ return -ENOMEM;
+ }
+
+ sglist->num_dma_sg = pci_map_sg(cmd->drv_inst->pdev,
+ sglist->scatterlist,
+ sglist->num_sg, direction);
+
+ if (!sglist->num_dma_sg || sglist->num_dma_sg > PMCRAID_MAX_IOADLS) {
+ dev_err(&cmd->drv_inst->pdev->dev,
+ "Failed to map passthrough buffer!\n");
+ pmcraid_free_sglist(sglist);
+ return -EIO;
+ }
+
+ cmd->sglist = sglist;
+ ioarcb->request_flags0 |= NO_LINK_DESCS;
+
+ ioadl = pmcraid_init_ioadls(cmd, sglist->num_dma_sg);
+
+ /* Initialize IOADL descriptor addresses */
+ for_each_sg(sglist->scatterlist, sg, sglist->num_dma_sg, i) {
+ ioadl[i].data_len = cpu_to_le32(sg_dma_len(sg));
+ ioadl[i].address = cpu_to_le64(sg_dma_address(sg));
+ ioadl[i].flags = 0;
+ }
+
+ /* setup the last descriptor */
+ ioadl[i - 1].flags = cpu_to_le32(IOADL_FLAGS_LAST_DESC);
+
+ return 0;
+}
+
+
+/**
+ * pmcraid_release_passthrough_ioadls - release passthrough ioadls
+ *
+ * @cmd: pointer to struct pmcraid_cmd for which ioadls were allocated
+ * @buflen: size of the request buffer
+ * @direction: data transfer direction
+ *
+ * Return value
+ * 0 on sucess, non-zero error code on failure
+ */
+static void pmcraid_release_passthrough_ioadls(
+ struct pmcraid_cmd *cmd,
+ int buflen,
+ int direction
+)
+{
+ struct pmcraid_sglist *sglist = cmd->sglist;
+
+ if (buflen > 0) {
+ pci_unmap_sg(cmd->drv_inst->pdev,
+ sglist->scatterlist,
+ sglist->num_sg,
+ direction);
+ pmcraid_free_sglist(sglist);
+ cmd->sglist = NULL;
+ }
+}
+
+/**
+ * pmcraid_ioctl_passthrough - handling passthrough IOCTL commands
+ *
+ * @pinstance: pointer to adapter instance structure
+ * @cmd: ioctl code
+ * @arg: pointer to pmcraid_passthrough_buffer user buffer
+ *
+ * Return value
+ * 0 on sucess, non-zero error code on failure
+ */
+static long pmcraid_ioctl_passthrough(
+ struct pmcraid_instance *pinstance,
+ unsigned int ioctl_cmd,
+ unsigned int buflen,
+ unsigned long arg
+)
+{
+ struct pmcraid_passthrough_ioctl_buffer *buffer;
+ struct pmcraid_ioarcb *ioarcb;
+ struct pmcraid_cmd *cmd;
+ struct pmcraid_cmd *cancel_cmd;
+ unsigned long request_buffer;
+ unsigned long request_offset;
+ unsigned long lock_flags;
+ int request_size;
+ int buffer_size;
+ u8 access, direction;
+ int rc = 0;
+
+ /* If IOA reset is in progress, wait 10 secs for reset to complete */
+ if (pinstance->ioa_reset_in_progress) {
+ rc = wait_event_interruptible_timeout(
+ pinstance->reset_wait_q,
+ !pinstance->ioa_reset_in_progress,
+ msecs_to_jiffies(10000));
+
+ if (!rc)
+ return -ETIMEDOUT;
+ else if (rc < 0)
+ return -ERESTARTSYS;
+ }
+
+ /* If adapter is not in operational state, return error */
+ if (pinstance->ioa_state != IOA_STATE_OPERATIONAL) {
+ pmcraid_err("IOA is not operational\n");
+ return -ENOTTY;
+ }
+
+ buffer_size = sizeof(struct pmcraid_passthrough_ioctl_buffer);
+ buffer = kmalloc(buffer_size, GFP_KERNEL);
+
+ if (!buffer) {
+ pmcraid_err("no memory for passthrough buffer\n");
+ return -ENOMEM;
+ }
+
+ request_offset =
+ offsetof(struct pmcraid_passthrough_ioctl_buffer, request_buffer);
+
+ request_buffer = arg + request_offset;
+
+ rc = __copy_from_user(buffer,
+ (struct pmcraid_passthrough_ioctl_buffer *) arg,
+ sizeof(struct pmcraid_passthrough_ioctl_buffer));
+ if (rc) {
+ pmcraid_err("ioctl: can't copy passthrough buffer\n");
+ rc = -EFAULT;
+ goto out_free_buffer;
+ }
+
+ request_size = buffer->ioarcb.data_transfer_length;
+
+ if (buffer->ioarcb.request_flags0 & TRANSFER_DIR_WRITE) {
+ access = VERIFY_READ;
+ direction = DMA_TO_DEVICE;
+ } else {
+ access = VERIFY_WRITE;
+ direction = DMA_FROM_DEVICE;
+ }
+
+ if (request_size > 0) {
+ rc = access_ok(access, arg, request_offset + request_size);
+
+ if (!rc) {
+ rc = -EFAULT;
+ goto out_free_buffer;
+ }
+ }
+
+ /* check if we have any additional command parameters */
+ if (buffer->ioarcb.add_cmd_param_length > PMCRAID_ADD_CMD_PARAM_LEN) {
+ rc = -EINVAL;
+ goto out_free_buffer;
+ }
+
+ cmd = pmcraid_get_free_cmd(pinstance);
+
+ if (!cmd) {
+ pmcraid_err("free command block is not available\n");
+ rc = -ENOMEM;
+ goto out_free_buffer;
+ }
+
+ cmd->scsi_cmd = NULL;
+ ioarcb = &(cmd->ioa_cb->ioarcb);
+
+ /* Copy the user-provided IOARCB stuff field by field */
+ ioarcb->resource_handle = buffer->ioarcb.resource_handle;
+ ioarcb->data_transfer_length = buffer->ioarcb.data_transfer_length;
+ ioarcb->cmd_timeout = buffer->ioarcb.cmd_timeout;
+ ioarcb->request_type = buffer->ioarcb.request_type;
+ ioarcb->request_flags0 = buffer->ioarcb.request_flags0;
+ ioarcb->request_flags1 = buffer->ioarcb.request_flags1;
+ memcpy(ioarcb->cdb, buffer->ioarcb.cdb, PMCRAID_MAX_CDB_LEN);
+
+ if (buffer->ioarcb.add_cmd_param_length) {
+ ioarcb->add_cmd_param_length =
+ buffer->ioarcb.add_cmd_param_length;
+ ioarcb->add_cmd_param_offset =
+ buffer->ioarcb.add_cmd_param_offset;
+ memcpy(ioarcb->add_data.u.add_cmd_params,
+ buffer->ioarcb.add_data.u.add_cmd_params,
+ buffer->ioarcb.add_cmd_param_length);
+ }
+
+ if (request_size) {
+ rc = pmcraid_build_passthrough_ioadls(cmd,
+ request_size,
+ direction);
+ if (rc) {
+ pmcraid_err("couldn't build passthrough ioadls\n");
+ goto out_free_buffer;
+ }
+ }
+
+ /* If data is being written into the device, copy the data from user
+ * buffers
+ */
+ if (direction == DMA_TO_DEVICE && request_size > 0) {
+ rc = pmcraid_copy_sglist(cmd->sglist,
+ request_buffer,
+ request_size,
+ direction);
+ if (rc) {
+ pmcraid_err("failed to copy user buffer\n");
+ goto out_free_sglist;
+ }
+ }
+
+ /* passthrough ioctl is a blocking command so, put the user to sleep
+ * until timeout. Note that a timeout value of 0 means, do timeout.
+ */
+ cmd->cmd_done = pmcraid_internal_done;
+ init_completion(&cmd->wait_for_completion);
+ cmd->completion_req = 1;
+
+ pmcraid_info("command(%d) (CDB[0] = %x) for %x\n",
+ le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2,
+ cmd->ioa_cb->ioarcb.cdb[0],
+ le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle));
+
+ spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
+ _pmcraid_fire_command(cmd);
+ spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
+
+ /* If command timeout is specified put caller to wait till that time,
+ * otherwise it would be blocking wait. If command gets timed out, it
+ * will be aborted.
+ */
+ if (buffer->ioarcb.cmd_timeout == 0) {
+ wait_for_completion(&cmd->wait_for_completion);
+ } else if (!wait_for_completion_timeout(
+ &cmd->wait_for_completion,
+ msecs_to_jiffies(buffer->ioarcb.cmd_timeout * 1000))) {
+
+ pmcraid_info("aborting cmd %d (CDB[0] = %x) due to timeout\n",
+ le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle >> 2),
+ cmd->ioa_cb->ioarcb.cdb[0]);
+
+ rc = -ETIMEDOUT;
+ spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
+ cancel_cmd = pmcraid_abort_cmd(cmd);
+ spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
+
+ if (cancel_cmd) {
+ wait_for_completion(&cancel_cmd->wait_for_completion);
+ pmcraid_return_cmd(cancel_cmd);
+ }
+
+ goto out_free_sglist;
+ }
+
+ /* If the command failed for any reason, copy entire IOASA buffer and
+ * return IOCTL success. If copying IOASA to user-buffer fails, return
+ * EFAULT
+ */
+ if (le32_to_cpu(cmd->ioa_cb->ioasa.ioasc)) {
+
+ void *ioasa =
+ (void *)(arg +
+ offsetof(struct pmcraid_passthrough_ioctl_buffer, ioasa));
+
+ pmcraid_info("command failed with %x\n",
+ le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
+ if (copy_to_user(ioasa, &cmd->ioa_cb->ioasa,
+ sizeof(struct pmcraid_ioasa))) {
+ pmcraid_err("failed to copy ioasa buffer to user\n");
+ rc = -EFAULT;
+ }
+ }
+ /* If the data transfer was from device, copy the data onto user
+ * buffers
+ */
+ else if (direction == DMA_FROM_DEVICE && request_size > 0) {
+ rc = pmcraid_copy_sglist(cmd->sglist,
+ request_buffer,
+ request_size,
+ direction);
+ if (rc) {
+ pmcraid_err("failed to copy user buffer\n");
+ rc = -EFAULT;
+ }
+ }
+
+out_free_sglist:
+ pmcraid_release_passthrough_ioadls(cmd, request_size, direction);
+ pmcraid_return_cmd(cmd);
+
+out_free_buffer:
+ kfree(buffer);
+
+ return rc;
+}
+
+
+
+
+/**
+ * pmcraid_ioctl_driver - ioctl handler for commands handled by driver itself
+ *
+ * @pinstance: pointer to adapter instance structure
+ * @cmd: ioctl command passed in
+ * @buflen: length of user_buffer
+ * @user_buffer: user buffer pointer
+ *
+ * Return Value
+ * 0 in case of success, otherwise appropriate error code
+ */
+static long pmcraid_ioctl_driver(
+ struct pmcraid_instance *pinstance,
+ unsigned int cmd,
+ unsigned int buflen,
+ void __user *user_buffer
+)
+{
+ int rc = -ENOSYS;
+
+ if (!access_ok(VERIFY_READ, user_buffer, _IOC_SIZE(cmd))) {
+ pmcraid_err("ioctl_driver: access fault in request buffer \n");
+ return -EFAULT;
+ }
+
+ switch (cmd) {
+ case PMCRAID_IOCTL_RESET_ADAPTER:
+ pmcraid_reset_bringup(pinstance);
+ rc = 0;
+ break;
+
+ default:
+ break;
+ }
+
+ return rc;
+}
+
+/**
+ * pmcraid_check_ioctl_buffer - check for proper access to user buffer
+ *
+ * @cmd: ioctl command
+ * @arg: user buffer
+ * @hdr: pointer to kernel memory for pmcraid_ioctl_header
+ *
+ * Return Value
+ * negetive error code if there are access issues, otherwise zero.
+ * Upon success, returns ioctl header copied out of user buffer.
+ */
+
+static int pmcraid_check_ioctl_buffer(
+ int cmd,
+ void __user *arg,
+ struct pmcraid_ioctl_header *hdr
+)
+{
+ int rc = 0;
+ int access = VERIFY_READ;
+
+ if (copy_from_user(hdr, arg, sizeof(struct pmcraid_ioctl_header))) {
+ pmcraid_err("couldn't copy ioctl header from user buffer\n");
+ return -EFAULT;
+ }
+
+ /* check for valid driver signature */
+ rc = memcmp(hdr->signature,
+ PMCRAID_IOCTL_SIGNATURE,
+ sizeof(hdr->signature));
+ if (rc) {
+ pmcraid_err("signature verification failed\n");
+ return -EINVAL;
+ }
+
+ /* buffer length can't be negetive */
+ if (hdr->buffer_length < 0) {
+ pmcraid_err("ioctl: invalid buffer length specified\n");
+ return -EINVAL;
+ }
+
+ /* check for appropriate buffer access */
+ if ((_IOC_DIR(cmd) & _IOC_READ) == _IOC_READ)
+ access = VERIFY_WRITE;
+
+ rc = access_ok(access,
+ (arg + sizeof(struct pmcraid_ioctl_header)),
+ hdr->buffer_length);
+ if (!rc) {
+ pmcraid_err("access failed for user buffer of size %d\n",
+ hdr->buffer_length);
+ return -EFAULT;
+ }
+
+ return 0;
+}
+
+/**
+ * pmcraid_ioctl - char node ioctl entry point
+ */
+static long pmcraid_chr_ioctl(
+ struct file *filep,
+ unsigned int cmd,
+ unsigned long arg
+)
+{
+ struct pmcraid_instance *pinstance = NULL;
+ struct pmcraid_ioctl_header *hdr = NULL;
+ int retval = -ENOTTY;
+
+ hdr = kmalloc(GFP_KERNEL, sizeof(struct pmcraid_ioctl_header));
+
+ if (!hdr) {
+ pmcraid_err("faile to allocate memory for ioctl header\n");
+ return -ENOMEM;
+ }
+
+ retval = pmcraid_check_ioctl_buffer(cmd, (void *)arg, hdr);
+
+ if (retval) {
+ pmcraid_info("chr_ioctl: header check failed\n");
+ kfree(hdr);
+ return retval;
+ }
+
+ pinstance = (struct pmcraid_instance *)filep->private_data;
+
+ if (!pinstance) {
+ pmcraid_info("adapter instance is not found\n");
+ kfree(hdr);
+ return -ENOTTY;
+ }
+
+ switch (_IOC_TYPE(cmd)) {
+
+ case PMCRAID_PASSTHROUGH_IOCTL:
+ /* If ioctl code is to download microcode, we need to block
+ * mid-layer requests.
+ */
+ if (cmd == PMCRAID_IOCTL_DOWNLOAD_MICROCODE)
+ scsi_block_requests(pinstance->host);
+
+ retval = pmcraid_ioctl_passthrough(pinstance,
+ cmd,
+ hdr->buffer_length,
+ arg);
+
+ if (cmd == PMCRAID_IOCTL_DOWNLOAD_MICROCODE)
+ scsi_unblock_requests(pinstance->host);
+ break;
+
+ case PMCRAID_DRIVER_IOCTL:
+ arg += sizeof(struct pmcraid_ioctl_header);
+ retval = pmcraid_ioctl_driver(pinstance,
+ cmd,
+ hdr->buffer_length,
+ (void __user *)arg);
+ break;
+
+ default:
+ retval = -ENOTTY;
+ break;
+ }
+
+ kfree(hdr);
+
+ return retval;
+}
+
+/**
+ * File operations structure for management interface
+ */
+static const struct file_operations pmcraid_fops = {
+ .owner = THIS_MODULE,
+ .open = pmcraid_chr_open,
+ .release = pmcraid_chr_release,
+ .fasync = pmcraid_chr_fasync,
+ .unlocked_ioctl = pmcraid_chr_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = pmcraid_chr_ioctl,
+#endif
+};
+
+
+
+
+/**
+ * pmcraid_show_log_level - Display adapter's error logging level
+ * @dev: class device struct
+ * @buf: buffer
+ *
+ * Return value:
+ * number of bytes printed to buffer
+ */
+static ssize_t pmcraid_show_log_level(
+ struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct Scsi_Host *shost = class_to_shost(dev);
+ struct pmcraid_instance *pinstance =
+ (struct pmcraid_instance *)shost->hostdata;
+ return snprintf(buf, PAGE_SIZE, "%d\n", pinstance->current_log_level);
+}
+
+/**
+ * pmcraid_store_log_level - Change the adapter's error logging level
+ * @dev: class device struct
+ * @buf: buffer
+ * @count: not used
+ *
+ * Return value:
+ * number of bytes printed to buffer
+ */
+static ssize_t pmcraid_store_log_level(
+ struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t count
+)
+{
+ struct Scsi_Host *shost;
+ struct pmcraid_instance *pinstance;
+ unsigned long val;
+
+ if (strict_strtoul(buf, 10, &val))
+ return -EINVAL;
+ /* log-level should be from 0 to 2 */
+ if (val > 2)
+ return -EINVAL;
+
+ shost = class_to_shost(dev);
+ pinstance = (struct pmcraid_instance *)shost->hostdata;
+ pinstance->current_log_level = val;
+
+ return strlen(buf);
+}
+
+static struct device_attribute pmcraid_log_level_attr = {
+ .attr = {
+ .name = "log_level",
+ .mode = S_IRUGO | S_IWUSR,
+ },
+ .show = pmcraid_show_log_level,
+ .store = pmcraid_store_log_level,
+};
+
+/**
+ * pmcraid_show_drv_version - Display driver version
+ * @dev: class device struct
+ * @buf: buffer
+ *
+ * Return value:
+ * number of bytes printed to buffer
+ */
+static ssize_t pmcraid_show_drv_version(
+ struct device *dev,
+ struct device_attribute *attr,
+ char *buf
+)
+{
+ return snprintf(buf, PAGE_SIZE, "version: %s, build date: %s\n",
+ PMCRAID_DRIVER_VERSION, PMCRAID_DRIVER_DATE);
+}
+
+static struct device_attribute pmcraid_driver_version_attr = {
+ .attr = {
+ .name = "drv_version",
+ .mode = S_IRUGO,
+ },
+ .show = pmcraid_show_drv_version,
+};
+
+/**
+ * pmcraid_show_io_adapter_id - Display driver assigned adapter id
+ * @dev: class device struct
+ * @buf: buffer
+ *
+ * Return value:
+ * number of bytes printed to buffer
+ */
+static ssize_t pmcraid_show_adapter_id(
+ struct device *dev,
+ struct device_attribute *attr,
+ char *buf
+)
+{
+ struct Scsi_Host *shost = class_to_shost(dev);
+ struct pmcraid_instance *pinstance =
+ (struct pmcraid_instance *)shost->hostdata;
+ u32 adapter_id = (pinstance->pdev->bus->number << 8) |
+ pinstance->pdev->devfn;
+ u32 aen_group = pmcraid_event_family.id;
+
+ return snprintf(buf, PAGE_SIZE,
+ "adapter id: %d\nminor: %d\naen group: %d\n",
+ adapter_id, MINOR(pinstance->cdev.dev), aen_group);
+}
+
+static struct device_attribute pmcraid_adapter_id_attr = {
+ .attr = {
+ .name = "adapter_id",
+ .mode = S_IRUGO | S_IWUSR,
+ },
+ .show = pmcraid_show_adapter_id,
+};
+
+static struct device_attribute *pmcraid_host_attrs[] = {
+ &pmcraid_log_level_attr,
+ &pmcraid_driver_version_attr,
+ &pmcraid_adapter_id_attr,
+ NULL,
+};
+
+
+/* host template structure for pmcraid driver */
+static struct scsi_host_template pmcraid_host_template = {
+ .module = THIS_MODULE,
+ .name = PMCRAID_DRIVER_NAME,
+ .queuecommand = pmcraid_queuecommand,
+ .eh_abort_handler = pmcraid_eh_abort_handler,
+ .eh_bus_reset_handler = pmcraid_eh_bus_reset_handler,
+ .eh_target_reset_handler = pmcraid_eh_target_reset_handler,
+ .eh_device_reset_handler = pmcraid_eh_device_reset_handler,
+ .eh_host_reset_handler = pmcraid_eh_host_reset_handler,
+
+ .slave_alloc = pmcraid_slave_alloc,
+ .slave_configure = pmcraid_slave_configure,
+ .slave_destroy = pmcraid_slave_destroy,
+ .change_queue_depth = pmcraid_change_queue_depth,
+ .change_queue_type = pmcraid_change_queue_type,
+ .can_queue = PMCRAID_MAX_IO_CMD,
+ .this_id = -1,
+ .sg_tablesize = PMCRAID_MAX_IOADLS,
+ .max_sectors = PMCRAID_IOA_MAX_SECTORS,
+ .cmd_per_lun = PMCRAID_MAX_CMD_PER_LUN,
+ .use_clustering = ENABLE_CLUSTERING,
+ .shost_attrs = pmcraid_host_attrs,
+ .proc_name = PMCRAID_DRIVER_NAME
+};
+
+/**
+ * pmcraid_isr_common - Common interrupt handler routine
+ *
+ * @pinstance: pointer to adapter instance
+ * @intrs: active interrupts (contents of ioa_host_interrupt register)
+ * @hrrq_id: Host RRQ index
+ *
+ * Return Value
+ * none
+ */
+static void pmcraid_isr_common(
+ struct pmcraid_instance *pinstance,
+ u32 intrs,
+ int hrrq_id
+)
+{
+ u32 intrs_clear =
+ (intrs & INTRS_CRITICAL_OP_IN_PROGRESS) ? intrs
+ : INTRS_HRRQ_VALID;
+ iowrite32(intrs_clear,
+ pinstance->int_regs.ioa_host_interrupt_clr_reg);
+ intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
+
+ /* hrrq valid bit was set, schedule tasklet to handle the response */
+ if (intrs_clear == INTRS_HRRQ_VALID)
+ tasklet_schedule(&(pinstance->isr_tasklet[hrrq_id]));
+}
+
+/**
+ * pmcraid_isr - implements interrupt handling routine
+ *
+ * @irq: interrupt vector number
+ * @dev_id: pointer hrrq_vector
+ *
+ * Return Value
+ * IRQ_HANDLED if interrupt is handled or IRQ_NONE if ignored
+ */
+static irqreturn_t pmcraid_isr(int irq, void *dev_id)
+{
+ struct pmcraid_isr_param *hrrq_vector;
+ struct pmcraid_instance *pinstance;
+ unsigned long lock_flags;
+ u32 intrs;
+
+ /* In case of legacy interrupt mode where interrupts are shared across
+ * isrs, it may be possible that the current interrupt is not from IOA
+ */
+ if (!dev_id) {
+ printk(KERN_INFO "%s(): NULL host pointer\n", __func__);
+ return IRQ_NONE;
+ }
+
+ hrrq_vector = (struct pmcraid_isr_param *)dev_id;
+ pinstance = hrrq_vector->drv_inst;
+
+ /* Acquire the lock (currently host_lock) while processing interrupts.
+ * This interval is small as most of the response processing is done by
+ * tasklet without the lock.
+ */
+ spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
+ intrs = pmcraid_read_interrupts(pinstance);
+
+ if (unlikely((intrs & PMCRAID_PCI_INTERRUPTS) == 0)) {
+ spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
+ return IRQ_NONE;
+ }
+
+ /* Any error interrupts including unit_check, initiate IOA reset.
+ * In case of unit check indicate to reset_sequence that IOA unit
+ * checked and prepare for a dump during reset sequence
+ */
+ if (intrs & PMCRAID_ERROR_INTERRUPTS) {
+
+ if (intrs & INTRS_IOA_UNIT_CHECK)
+ pinstance->ioa_unit_check = 1;
+
+ iowrite32(intrs,
+ pinstance->int_regs.ioa_host_interrupt_clr_reg);
+ pmcraid_err("ISR: error interrupts: %x initiating reset\n",
+ intrs);
+ intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
+ pmcraid_initiate_reset(pinstance);
+ } else {
+ pmcraid_isr_common(pinstance, intrs, hrrq_vector->hrrq_id);
+ }
+
+ spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
+
+ return IRQ_HANDLED;
+}
+
+
+/**
+ * pmcraid_worker_function - worker thread function
+ *
+ * @workp: pointer to struct work queue
+ *
+ * Return Value
+ * None
+ */
+
+static void pmcraid_worker_function(struct work_struct *workp)
+{
+ struct pmcraid_instance *pinstance;
+ struct pmcraid_resource_entry *res;
+ struct pmcraid_resource_entry *temp;
+ struct scsi_device *sdev;
+ unsigned long lock_flags;
+ unsigned long host_lock_flags;
+ u8 bus, target, lun;
+
+ pinstance = container_of(workp, struct pmcraid_instance, worker_q);
+ /* add resources only after host is added into system */
+ if (!atomic_read(&pinstance->expose_resources))
+ return;
+
+ spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
+ list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue) {
+
+ if (res->change_detected == RES_CHANGE_DEL && res->scsi_dev) {
+ sdev = res->scsi_dev;
+
+ /* host_lock must be held before calling
+ * scsi_device_get
+ */
+ spin_lock_irqsave(pinstance->host->host_lock,
+ host_lock_flags);
+ if (!scsi_device_get(sdev)) {
+ spin_unlock_irqrestore(
+ pinstance->host->host_lock,
+ host_lock_flags);
+ pmcraid_info("deleting %x from midlayer\n",
+ res->cfg_entry.resource_address);
+ list_move_tail(&res->queue,
+ &pinstance->free_res_q);
+ spin_unlock_irqrestore(
+ &pinstance->resource_lock,
+ lock_flags);
+ scsi_remove_device(sdev);
+ scsi_device_put(sdev);
+ spin_lock_irqsave(&pinstance->resource_lock,
+ lock_flags);
+ res->change_detected = 0;
+ } else {
+ spin_unlock_irqrestore(
+ pinstance->host->host_lock,
+ host_lock_flags);
+ }
+ }
+ }
+
+ list_for_each_entry(res, &pinstance->used_res_q, queue) {
+
+ if (res->change_detected == RES_CHANGE_ADD) {
+
+ if (!pmcraid_expose_resource(&res->cfg_entry))
+ continue;
+
+ if (RES_IS_VSET(res->cfg_entry)) {
+ bus = PMCRAID_VSET_BUS_ID;
+ target = res->cfg_entry.unique_flags1;
+ lun = PMCRAID_VSET_LUN_ID;
+ } else {
+ bus = PMCRAID_PHYS_BUS_ID;
+ target =
+ RES_TARGET(
+ res->cfg_entry.resource_address);
+ lun = RES_LUN(res->cfg_entry.resource_address);
+ }
+
+ res->change_detected = 0;
+ spin_unlock_irqrestore(&pinstance->resource_lock,
+ lock_flags);
+ scsi_add_device(pinstance->host, bus, target, lun);
+ spin_lock_irqsave(&pinstance->resource_lock,
+ lock_flags);
+ }
+ }
+
+ spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
+}
+
+/**
+ * pmcraid_tasklet_function - Tasklet function
+ *
+ * @instance: pointer to msix param structure
+ *
+ * Return Value
+ * None
+ */
+void pmcraid_tasklet_function(unsigned long instance)
+{
+ struct pmcraid_isr_param *hrrq_vector;
+ struct pmcraid_instance *pinstance;
+ unsigned long hrrq_lock_flags;
+ unsigned long pending_lock_flags;
+ unsigned long host_lock_flags;
+ spinlock_t *lockp; /* hrrq buffer lock */
+ int id;
+ u32 intrs;
+ __le32 resp;
+
+ hrrq_vector = (struct pmcraid_isr_param *)instance;
+ pinstance = hrrq_vector->drv_inst;
+ id = hrrq_vector->hrrq_id;
+ lockp = &(pinstance->hrrq_lock[id]);
+ intrs = pmcraid_read_interrupts(pinstance);
+
+ /* If interrupts was as part of the ioa initialization, clear and mask
+ * it. Delete the timer and wakeup the reset engine to proceed with
+ * reset sequence
+ */
+ if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) {
+ iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
+ pinstance->int_regs.ioa_host_interrupt_mask_reg);
+ iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
+ pinstance->int_regs.ioa_host_interrupt_clr_reg);
+
+ if (pinstance->reset_cmd != NULL) {
+ del_timer(&pinstance->reset_cmd->timer);
+ spin_lock_irqsave(pinstance->host->host_lock,
+ host_lock_flags);
+ pinstance->reset_cmd->cmd_done(pinstance->reset_cmd);
+ spin_unlock_irqrestore(pinstance->host->host_lock,
+ host_lock_flags);
+ }
+ return;
+ }
+
+ /* loop through each of the commands responded by IOA. Each HRRQ buf is
+ * protected by its own lock. Traversals must be done within this lock
+ * as there may be multiple tasklets running on multiple CPUs. Note
+ * that the lock is held just for picking up the response handle and
+ * manipulating hrrq_curr/toggle_bit values.
+ */
+ spin_lock_irqsave(lockp, hrrq_lock_flags);
+
+ resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
+
+ while ((resp & HRRQ_TOGGLE_BIT) ==
+ pinstance->host_toggle_bit[id]) {
+
+ int cmd_index = resp >> 2;
+ struct pmcraid_cmd *cmd = NULL;
+
+ if (cmd_index < PMCRAID_MAX_CMD) {
+ cmd = pinstance->cmd_list[cmd_index];
+ } else {
+ /* In case of invalid response handle, initiate IOA
+ * reset sequence.
+ */
+ spin_unlock_irqrestore(lockp, hrrq_lock_flags);
+
+ pmcraid_err("Invalid response %d initiating reset\n",
+ cmd_index);
+
+ spin_lock_irqsave(pinstance->host->host_lock,
+ host_lock_flags);
+ pmcraid_initiate_reset(pinstance);
+ spin_unlock_irqrestore(pinstance->host->host_lock,
+ host_lock_flags);
+
+ spin_lock_irqsave(lockp, hrrq_lock_flags);
+ break;
+ }
+
+ if (pinstance->hrrq_curr[id] < pinstance->hrrq_end[id]) {
+ pinstance->hrrq_curr[id]++;
+ } else {
+ pinstance->hrrq_curr[id] = pinstance->hrrq_start[id];
+ pinstance->host_toggle_bit[id] ^= 1u;
+ }
+
+ spin_unlock_irqrestore(lockp, hrrq_lock_flags);
+
+ spin_lock_irqsave(&pinstance->pending_pool_lock,
+ pending_lock_flags);
+ list_del(&cmd->free_list);
+ spin_unlock_irqrestore(&pinstance->pending_pool_lock,
+ pending_lock_flags);
+ del_timer(&cmd->timer);
+ atomic_dec(&pinstance->outstanding_cmds);
+
+ if (cmd->cmd_done == pmcraid_ioa_reset) {
+ spin_lock_irqsave(pinstance->host->host_lock,
+ host_lock_flags);
+ cmd->cmd_done(cmd);
+ spin_unlock_irqrestore(pinstance->host->host_lock,
+ host_lock_flags);
+ } else if (cmd->cmd_done != NULL) {
+ cmd->cmd_done(cmd);
+ }
+ /* loop over until we are done with all responses */
+ spin_lock_irqsave(lockp, hrrq_lock_flags);
+ resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
+ }
+
+ spin_unlock_irqrestore(lockp, hrrq_lock_flags);
+}
+
+/**
+ * pmcraid_unregister_interrupt_handler - de-register interrupts handlers
+ * @pinstance: pointer to adapter instance structure
+ *
+ * This routine un-registers registered interrupt handler and
+ * also frees irqs/vectors.
+ *
+ * Retun Value
+ * None
+ */
+static
+void pmcraid_unregister_interrupt_handler(struct pmcraid_instance *pinstance)
+{
+ free_irq(pinstance->pdev->irq, &(pinstance->hrrq_vector[0]));
+}
+
+/**
+ * pmcraid_register_interrupt_handler - registers interrupt handler
+ * @pinstance: pointer to per-adapter instance structure
+ *
+ * Return Value
+ * 0 on success, non-zero error code otherwise.
+ */
+static int
+pmcraid_register_interrupt_handler(struct pmcraid_instance *pinstance)
+{
+ struct pci_dev *pdev = pinstance->pdev;
+
+ pinstance->hrrq_vector[0].hrrq_id = 0;
+ pinstance->hrrq_vector[0].drv_inst = pinstance;
+ pinstance->hrrq_vector[0].vector = 0;
+ pinstance->num_hrrq = 1;
+ return request_irq(pdev->irq, pmcraid_isr, IRQF_SHARED,
+ PMCRAID_DRIVER_NAME, &pinstance->hrrq_vector[0]);
+}
+
+/**
+ * pmcraid_release_cmd_blocks - release buufers allocated for command blocks
+ * @pinstance: per adapter instance structure pointer
+ * @max_index: number of buffer blocks to release
+ *
+ * Return Value
+ * None
+ */
+static void
+pmcraid_release_cmd_blocks(struct pmcraid_instance *pinstance, int max_index)
+{
+ int i;
+ for (i = 0; i < max_index; i++) {
+ kmem_cache_free(pinstance->cmd_cachep, pinstance->cmd_list[i]);
+ pinstance->cmd_list[i] = NULL;
+ }
+ kmem_cache_destroy(pinstance->cmd_cachep);
+ pinstance->cmd_cachep = NULL;
+}
+
+/**
+ * pmcraid_release_control_blocks - releases buffers alloced for control blocks
+ * @pinstance: pointer to per adapter instance structure
+ * @max_index: number of buffers (from 0 onwards) to release
+ *
+ * This function assumes that the command blocks for which control blocks are
+ * linked are not released.
+ *
+ * Return Value
+ * None
+ */
+static void
+pmcraid_release_control_blocks(
+ struct pmcraid_instance *pinstance,
+ int max_index
+)
+{
+ int i;
+
+ if (pinstance->control_pool == NULL)
+ return;
+
+ for (i = 0; i < max_index; i++) {
+ pci_pool_free(pinstance->control_pool,
+ pinstance->cmd_list[i]->ioa_cb,
+ pinstance->cmd_list[i]->ioa_cb_bus_addr);
+ pinstance->cmd_list[i]->ioa_cb = NULL;
+ pinstance->cmd_list[i]->ioa_cb_bus_addr = 0;
+ }
+ pci_pool_destroy(pinstance->control_pool);
+ pinstance->control_pool = NULL;
+}
+
+/**
+ * pmcraid_allocate_cmd_blocks - allocate memory for cmd block structures
+ * @pinstance - pointer to per adapter instance structure
+ *
+ * Allocates memory for command blocks using kernel slab allocator.
+ *
+ * Return Value
+ * 0 in case of success; -ENOMEM in case of failure
+ */
+static int __devinit
+pmcraid_allocate_cmd_blocks(struct pmcraid_instance *pinstance)
+{
+ int i;
+
+ sprintf(pinstance->cmd_pool_name, "pmcraid_cmd_pool_%d",
+ pinstance->host->unique_id);
+
+
+ pinstance->cmd_cachep = kmem_cache_create(
+ pinstance->cmd_pool_name,
+ sizeof(struct pmcraid_cmd), 0,
+ SLAB_HWCACHE_ALIGN, NULL);
+ if (!pinstance->cmd_cachep)
+ return -ENOMEM;
+
+ for (i = 0; i < PMCRAID_MAX_CMD; i++) {
+ pinstance->cmd_list[i] =
+ kmem_cache_alloc(pinstance->cmd_cachep, GFP_KERNEL);
+ if (!pinstance->cmd_list[i]) {
+ pmcraid_release_cmd_blocks(pinstance, i);
+ return -ENOMEM;
+ }
+ }
+ return 0;
+}
+
+/**
+ * pmcraid_allocate_control_blocks - allocates memory control blocks
+ * @pinstance : pointer to per adapter instance structure
+ *
+ * This function allocates PCI memory for DMAable buffers like IOARCB, IOADLs
+ * and IOASAs. This is called after command blocks are already allocated.
+ *
+ * Return Value
+ * 0 in case it can allocate all control blocks, otherwise -ENOMEM
+ */
+static int __devinit
+pmcraid_allocate_control_blocks(struct pmcraid_instance *pinstance)
+{
+ int i;
+
+ sprintf(pinstance->ctl_pool_name, "pmcraid_control_pool_%d",
+ pinstance->host->unique_id);
+
+ pinstance->control_pool =
+ pci_pool_create(pinstance->ctl_pool_name,
+ pinstance->pdev,
+ sizeof(struct pmcraid_control_block),
+ PMCRAID_IOARCB_ALIGNMENT, 0);
+
+ if (!pinstance->control_pool)
+ return -ENOMEM;
+
+ for (i = 0; i < PMCRAID_MAX_CMD; i++) {
+ pinstance->cmd_list[i]->ioa_cb =
+ pci_pool_alloc(
+ pinstance->control_pool,
+ GFP_KERNEL,
+ &(pinstance->cmd_list[i]->ioa_cb_bus_addr));
+
+ if (!pinstance->cmd_list[i]->ioa_cb) {
+ pmcraid_release_control_blocks(pinstance, i);
+ return -ENOMEM;
+ }
+ memset(pinstance->cmd_list[i]->ioa_cb, 0,
+ sizeof(struct pmcraid_control_block));
+ }
+ return 0;
+}
+
+/**
+ * pmcraid_release_host_rrqs - release memory allocated for hrrq buffer(s)
+ * @pinstance: pointer to per adapter instance structure
+ * @maxindex: size of hrrq buffer pointer array
+ *
+ * Return Value
+ * None
+ */
+static void
+pmcraid_release_host_rrqs(struct pmcraid_instance *pinstance, int maxindex)
+{
+ int i;
+ for (i = 0; i < maxindex; i++) {
+
+ pci_free_consistent(pinstance->pdev,
+ HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD,
+ pinstance->hrrq_start[i],
+ pinstance->hrrq_start_bus_addr[i]);
+
+ /* reset pointers and toggle bit to zeros */
+ pinstance->hrrq_start[i] = NULL;
+ pinstance->hrrq_start_bus_addr[i] = 0;
+ pinstance->host_toggle_bit[i] = 0;
+ }
+}
+
+/**
+ * pmcraid_allocate_host_rrqs - Allocate and initialize host RRQ buffers
+ * @pinstance: pointer to per adapter instance structure
+ *
+ * Return value
+ * 0 hrrq buffers are allocated, -ENOMEM otherwise.
+ */
+static int __devinit
+pmcraid_allocate_host_rrqs(struct pmcraid_instance *pinstance)
+{
+ int i;
+ int buf_count = PMCRAID_MAX_CMD / pinstance->num_hrrq;
+
+ for (i = 0; i < pinstance->num_hrrq; i++) {
+ int buffer_size = HRRQ_ENTRY_SIZE * buf_count;
+
+ pinstance->hrrq_start[i] =
+ pci_alloc_consistent(
+ pinstance->pdev,
+ buffer_size,
+ &(pinstance->hrrq_start_bus_addr[i]));
+
+ if (pinstance->hrrq_start[i] == 0) {
+ pmcraid_err("could not allocate host rrq: %d\n", i);
+ pmcraid_release_host_rrqs(pinstance, i);
+ return -ENOMEM;
+ }
+
+ memset(pinstance->hrrq_start[i], 0, buffer_size);
+ pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
+ pinstance->hrrq_end[i] =
+ pinstance->hrrq_start[i] + buf_count - 1;
+ pinstance->host_toggle_bit[i] = 1;
+ spin_lock_init(&pinstance->hrrq_lock[i]);
+ }
+ return 0;
+}
+
+/**
+ * pmcraid_release_hcams - release HCAM buffers
+ *
+ * @pinstance: pointer to per adapter instance structure
+ *
+ * Return value
+ * none
+ */
+static void pmcraid_release_hcams(struct pmcraid_instance *pinstance)
+{
+ if (pinstance->ccn.msg != NULL) {
+ pci_free_consistent(pinstance->pdev,
+ PMCRAID_AEN_HDR_SIZE +
+ sizeof(struct pmcraid_hcam_ccn),
+ pinstance->ccn.msg,
+ pinstance->ccn.baddr);
+
+ pinstance->ccn.msg = NULL;
+ pinstance->ccn.hcam = NULL;
+ pinstance->ccn.baddr = 0;
+ }
+
+ if (pinstance->ldn.msg != NULL) {
+ pci_free_consistent(pinstance->pdev,
+ PMCRAID_AEN_HDR_SIZE +
+ sizeof(struct pmcraid_hcam_ldn),
+ pinstance->ldn.msg,
+ pinstance->ldn.baddr);
+
+ pinstance->ldn.msg = NULL;
+ pinstance->ldn.hcam = NULL;
+ pinstance->ldn.baddr = 0;
+ }
+}
+
+/**
+ * pmcraid_allocate_hcams - allocates HCAM buffers
+ * @pinstance : pointer to per adapter instance structure
+ *
+ * Return Value:
+ * 0 in case of successful allocation, non-zero otherwise
+ */
+static int pmcraid_allocate_hcams(struct pmcraid_instance *pinstance)
+{
+ pinstance->ccn.msg = pci_alloc_consistent(
+ pinstance->pdev,
+ PMCRAID_AEN_HDR_SIZE +
+ sizeof(struct pmcraid_hcam_ccn),
+ &(pinstance->ccn.baddr));
+
+ pinstance->ldn.msg = pci_alloc_consistent(
+ pinstance->pdev,
+ PMCRAID_AEN_HDR_SIZE +
+ sizeof(struct pmcraid_hcam_ldn),
+ &(pinstance->ldn.baddr));
+
+ if (pinstance->ldn.msg == NULL || pinstance->ccn.msg == NULL) {
+ pmcraid_release_hcams(pinstance);
+ } else {
+ pinstance->ccn.hcam =
+ (void *)pinstance->ccn.msg + PMCRAID_AEN_HDR_SIZE;
+ pinstance->ldn.hcam =
+ (void *)pinstance->ldn.msg + PMCRAID_AEN_HDR_SIZE;
+
+ atomic_set(&pinstance->ccn.ignore, 0);
+ atomic_set(&pinstance->ldn.ignore, 0);
+ }
+
+ return (pinstance->ldn.msg == NULL) ? -ENOMEM : 0;
+}
+
+/**
+ * pmcraid_release_config_buffers - release config.table buffers
+ * @pinstance: pointer to per adapter instance structure
+ *
+ * Return Value
+ * none
+ */
+static void pmcraid_release_config_buffers(struct pmcraid_instance *pinstance)
+{
+ if (pinstance->cfg_table != NULL &&
+ pinstance->cfg_table_bus_addr != 0) {
+ pci_free_consistent(pinstance->pdev,
+ sizeof(struct pmcraid_config_table),
+ pinstance->cfg_table,
+ pinstance->cfg_table_bus_addr);
+ pinstance->cfg_table = NULL;
+ pinstance->cfg_table_bus_addr = 0;
+ }
+
+ if (pinstance->res_entries != NULL) {
+ int i;
+
+ for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
+ list_del(&pinstance->res_entries[i].queue);
+ kfree(pinstance->res_entries);
+ pinstance->res_entries = NULL;
+ }
+
+ pmcraid_release_hcams(pinstance);
+}
+
+/**
+ * pmcraid_allocate_config_buffers - allocates DMAable memory for config table
+ * @pinstance : pointer to per adapter instance structure
+ *
+ * Return Value
+ * 0 for successful allocation, -ENOMEM for any failure
+ */
+static int __devinit
+pmcraid_allocate_config_buffers(struct pmcraid_instance *pinstance)
+{
+ int i;
+
+ pinstance->res_entries =
+ kzalloc(sizeof(struct pmcraid_resource_entry) *
+ PMCRAID_MAX_RESOURCES, GFP_KERNEL);
+
+ if (NULL == pinstance->res_entries) {
+ pmcraid_err("failed to allocate memory for resource table\n");
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
+ list_add_tail(&pinstance->res_entries[i].queue,
+ &pinstance->free_res_q);
+
+ pinstance->cfg_table =
+ pci_alloc_consistent(pinstance->pdev,
+ sizeof(struct pmcraid_config_table),
+ &pinstance->cfg_table_bus_addr);
+
+ if (NULL == pinstance->cfg_table) {
+ pmcraid_err("couldn't alloc DMA memory for config table\n");
+ pmcraid_release_config_buffers(pinstance);
+ return -ENOMEM;
+ }
+
+ if (pmcraid_allocate_hcams(pinstance)) {
+ pmcraid_err("could not alloc DMA memory for HCAMS\n");
+ pmcraid_release_config_buffers(pinstance);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+/**
+ * pmcraid_init_tasklets - registers tasklets for response handling
+ *
+ * @pinstance: pointer adapter instance structure
+ *
+ * Return value
+ * none
+ */
+static void pmcraid_init_tasklets(struct pmcraid_instance *pinstance)
+{
+ int i;
+ for (i = 0; i < pinstance->num_hrrq; i++)
+ tasklet_init(&pinstance->isr_tasklet[i],
+ pmcraid_tasklet_function,
+ (unsigned long)&pinstance->hrrq_vector[i]);
+}
+
+/**
+ * pmcraid_kill_tasklets - destroys tasklets registered for response handling
+ *
+ * @pinstance: pointer to adapter instance structure
+ *
+ * Return value
+ * none
+ */
+static void pmcraid_kill_tasklets(struct pmcraid_instance *pinstance)
+{
+ int i;
+ for (i = 0; i < pinstance->num_hrrq; i++)
+ tasklet_kill(&pinstance->isr_tasklet[i]);
+}
+
+/**
+ * pmcraid_init_buffers - allocates memory and initializes various structures
+ * @pinstance: pointer to per adapter instance structure
+ *
+ * This routine pre-allocates memory based on the type of block as below:
+ * cmdblocks(PMCRAID_MAX_CMD): kernel memory using kernel's slab_allocator,
+ * IOARCBs(PMCRAID_MAX_CMD) : DMAable memory, using pci pool allocator
+ * config-table entries : DMAable memory using pci_alloc_consistent
+ * HostRRQs : DMAable memory, using pci_alloc_consistent
+ *
+ * Return Value
+ * 0 in case all of the blocks are allocated, -ENOMEM otherwise.
+ */
+static int __devinit pmcraid_init_buffers(struct pmcraid_instance *pinstance)
+{
+ int i;
+
+ if (pmcraid_allocate_host_rrqs(pinstance)) {
+ pmcraid_err("couldn't allocate memory for %d host rrqs\n",
+ pinstance->num_hrrq);
+ return -ENOMEM;
+ }
+
+ if (pmcraid_allocate_config_buffers(pinstance)) {
+ pmcraid_err("couldn't allocate memory for config buffers\n");
+ pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
+ return -ENOMEM;
+ }
+
+ if (pmcraid_allocate_cmd_blocks(pinstance)) {
+ pmcraid_err("couldn't allocate memory for cmd blocks \n");
+ pmcraid_release_config_buffers(pinstance);
+ pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
+ return -ENOMEM;
+ }
+
+ if (pmcraid_allocate_control_blocks(pinstance)) {
+ pmcraid_err("couldn't allocate memory control blocks \n");
+ pmcraid_release_config_buffers(pinstance);
+ pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
+ pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
+ return -ENOMEM;
+ }
+
+ /* Initialize all the command blocks and add them to free pool. No
+ * need to lock (free_pool_lock) as this is done in initialization
+ * itself
+ */
+ for (i = 0; i < PMCRAID_MAX_CMD; i++) {
+ struct pmcraid_cmd *cmdp = pinstance->cmd_list[i];
+ pmcraid_init_cmdblk(cmdp, i);
+ cmdp->drv_inst = pinstance;
+ list_add_tail(&cmdp->free_list, &pinstance->free_cmd_pool);
+ }
+
+ return 0;
+}
+
+/**
+ * pmcraid_reinit_buffers - resets various buffer pointers
+ * @pinstance: pointer to adapter instance
+ * Return value
+ * none
+ */
+static void pmcraid_reinit_buffers(struct pmcraid_instance *pinstance)
+{
+ int i;
+ int buffer_size = HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD;
+
+ for (i = 0; i < pinstance->num_hrrq; i++) {
+ memset(pinstance->hrrq_start[i], 0, buffer_size);
+ pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
+ pinstance->hrrq_end[i] =
+ pinstance->hrrq_start[i] + PMCRAID_MAX_CMD - 1;
+ pinstance->host_toggle_bit[i] = 1;
+ }
+}
+
+/**
+ * pmcraid_init_instance - initialize per instance data structure
+ * @pdev: pointer to pci device structure
+ * @host: pointer to Scsi_Host structure
+ * @mapped_pci_addr: memory mapped IOA configuration registers
+ *
+ * Return Value
+ * 0 on success, non-zero in case of any failure
+ */
+static int __devinit pmcraid_init_instance(
+ struct pci_dev *pdev,
+ struct Scsi_Host *host,
+ void __iomem *mapped_pci_addr
+)
+{
+ struct pmcraid_instance *pinstance =
+ (struct pmcraid_instance *)host->hostdata;
+
+ pinstance->host = host;
+ pinstance->pdev = pdev;
+
+ /* Initialize register addresses */
+ pinstance->mapped_dma_addr = mapped_pci_addr;
+
+ /* Initialize chip-specific details */
+ {
+ struct pmcraid_chip_details *chip_cfg = pinstance->chip_cfg;
+ struct pmcraid_interrupts *pint_regs = &pinstance->int_regs;
+
+ pinstance->ioarrin = mapped_pci_addr + chip_cfg->ioarrin;
+
+ pint_regs->ioa_host_interrupt_reg =
+ mapped_pci_addr + chip_cfg->ioa_host_intr;
+ pint_regs->ioa_host_interrupt_clr_reg =
+ mapped_pci_addr + chip_cfg->ioa_host_intr_clr;
+ pint_regs->host_ioa_interrupt_reg =
+ mapped_pci_addr + chip_cfg->host_ioa_intr;
+ pint_regs->host_ioa_interrupt_clr_reg =
+ mapped_pci_addr + chip_cfg->host_ioa_intr_clr;
+
+ /* Current version of firmware exposes interrupt mask set
+ * and mask clr registers through memory mapped bar0.
+ */
+ pinstance->mailbox = mapped_pci_addr + chip_cfg->mailbox;
+ pinstance->ioa_status = mapped_pci_addr + chip_cfg->ioastatus;
+ pint_regs->ioa_host_interrupt_mask_reg =
+ mapped_pci_addr + chip_cfg->ioa_host_mask;
+ pint_regs->ioa_host_interrupt_mask_clr_reg =
+ mapped_pci_addr + chip_cfg->ioa_host_mask_clr;
+ pint_regs->global_interrupt_mask_reg =
+ mapped_pci_addr + chip_cfg->global_intr_mask;
+ };
+
+ pinstance->ioa_reset_attempts = 0;
+ init_waitqueue_head(&pinstance->reset_wait_q);
+
+ atomic_set(&pinstance->outstanding_cmds, 0);
+ atomic_set(&pinstance->expose_resources, 0);
+
+ INIT_LIST_HEAD(&pinstance->free_res_q);
+ INIT_LIST_HEAD(&pinstance->used_res_q);
+ INIT_LIST_HEAD(&pinstance->free_cmd_pool);
+ INIT_LIST_HEAD(&pinstance->pending_cmd_pool);
+
+ spin_lock_init(&pinstance->free_pool_lock);
+ spin_lock_init(&pinstance->pending_pool_lock);
+ spin_lock_init(&pinstance->resource_lock);
+ mutex_init(&pinstance->aen_queue_lock);
+
+ /* Work-queue (Shared) for deferred processing error handling */
+ INIT_WORK(&pinstance->worker_q, pmcraid_worker_function);
+
+ /* Initialize the default log_level */
+ pinstance->current_log_level = pmcraid_log_level;
+
+ /* Setup variables required for reset engine */
+ pinstance->ioa_state = IOA_STATE_UNKNOWN;
+ pinstance->reset_cmd = NULL;
+ return 0;
+}
+
+/**
+ * pmcraid_release_buffers - release per-adapter buffers allocated
+ *
+ * @pinstance: pointer to adapter soft state
+ *
+ * Return Value
+ * none
+ */
+static void pmcraid_release_buffers(struct pmcraid_instance *pinstance)
+{
+ pmcraid_release_config_buffers(pinstance);
+ pmcraid_release_control_blocks(pinstance, PMCRAID_MAX_CMD);
+ pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
+ pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
+
+}
+
+/**
+ * pmcraid_shutdown - shutdown adapter controller.
+ * @pdev: pci device struct
+ *
+ * Issues an adapter shutdown to the card waits for its completion
+ *
+ * Return value
+ * none
+ */
+static void pmcraid_shutdown(struct pci_dev *pdev)
+{
+ struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
+ pmcraid_reset_bringdown(pinstance);
+}
+
+
+/**
+ * pmcraid_get_minor - returns unused minor number from minor number bitmap
+ */
+static unsigned short pmcraid_get_minor(void)
+{
+ int minor;
+
+ minor = find_first_zero_bit(pmcraid_minor, sizeof(pmcraid_minor));
+ __set_bit(minor, pmcraid_minor);
+ return minor;
+}
+
+/**
+ * pmcraid_release_minor - releases given minor back to minor number bitmap
+ */
+static void pmcraid_release_minor(unsigned short minor)
+{
+ __clear_bit(minor, pmcraid_minor);
+}
+
+/**
+ * pmcraid_setup_chrdev - allocates a minor number and registers a char device
+ *
+ * @pinstance: pointer to adapter instance for which to register device
+ *
+ * Return value
+ * 0 in case of success, otherwise non-zero
+ */
+static int pmcraid_setup_chrdev(struct pmcraid_instance *pinstance)
+{
+ int minor;
+ int error;
+
+ minor = pmcraid_get_minor();
+ cdev_init(&pinstance->cdev, &pmcraid_fops);
+ pinstance->cdev.owner = THIS_MODULE;
+
+ error = cdev_add(&pinstance->cdev, MKDEV(pmcraid_major, minor), 1);
+
+ if (error)
+ pmcraid_release_minor(minor);
+ else
+ device_create(pmcraid_class, NULL, MKDEV(pmcraid_major, minor),
+ NULL, "pmcsas%u", minor);
+ return error;
+}
+
+/**
+ * pmcraid_release_chrdev - unregisters per-adapter management interface
+ *
+ * @pinstance: pointer to adapter instance structure
+ *
+ * Return value
+ * none
+ */
+static void pmcraid_release_chrdev(struct pmcraid_instance *pinstance)
+{
+ pmcraid_release_minor(MINOR(pinstance->cdev.dev));
+ device_destroy(pmcraid_class,
+ MKDEV(pmcraid_major, MINOR(pinstance->cdev.dev)));
+ cdev_del(&pinstance->cdev);
+}
+
+/**
+ * pmcraid_remove - IOA hot plug remove entry point
+ * @pdev: pci device struct
+ *
+ * Return value
+ * none
+ */
+static void __devexit pmcraid_remove(struct pci_dev *pdev)
+{
+ struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
+
+ /* remove the management interface (/dev file) for this device */
+ pmcraid_release_chrdev(pinstance);
+
+ /* remove host template from scsi midlayer */
+ scsi_remove_host(pinstance->host);
+
+ /* block requests from mid-layer */
+ scsi_block_requests(pinstance->host);
+
+ /* initiate shutdown adapter */
+ pmcraid_shutdown(pdev);
+
+ pmcraid_disable_interrupts(pinstance, ~0);
+ flush_scheduled_work();
+
+ pmcraid_kill_tasklets(pinstance);
+ pmcraid_unregister_interrupt_handler(pinstance);
+ pmcraid_release_buffers(pinstance);
+ iounmap(pinstance->mapped_dma_addr);
+ pci_release_regions(pdev);
+ scsi_host_put(pinstance->host);
+ pci_disable_device(pdev);
+
+ return;
+}
+
+#ifdef CONFIG_PM
+/**
+ * pmcraid_suspend - driver suspend entry point for power management
+ * @pdev: PCI device structure
+ * @state: PCI power state to suspend routine
+ *
+ * Return Value - 0 always
+ */
+static int pmcraid_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+ struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
+
+ pmcraid_shutdown(pdev);
+ pmcraid_disable_interrupts(pinstance, ~0);
+ pmcraid_kill_tasklets(pinstance);
+ pci_set_drvdata(pinstance->pdev, pinstance);
+ pmcraid_unregister_interrupt_handler(pinstance);
+ pci_save_state(pdev);
+ pci_disable_device(pdev);
+ pci_set_power_state(pdev, pci_choose_state(pdev, state));
+
+ return 0;
+}
+
+/**
+ * pmcraid_resume - driver resume entry point PCI power management
+ * @pdev: PCI device structure
+ *
+ * Return Value - 0 in case of success. Error code in case of any failure
+ */
+static int pmcraid_resume(struct pci_dev *pdev)
+{
+ struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
+ struct Scsi_Host *host = pinstance->host;
+ int rc;
+ int hrrqs;
+
+ pci_set_power_state(pdev, PCI_D0);
+ pci_enable_wake(pdev, PCI_D0, 0);
+ pci_restore_state(pdev);
+
+ rc = pci_enable_device(pdev);
+
+ if (rc) {
+ pmcraid_err("pmcraid: Enable device failed\n");
+ return rc;
+ }
+
+ pci_set_master(pdev);
+
+ if ((sizeof(dma_addr_t) == 4) ||
+ pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))
+ rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
+
+ if (rc == 0)
+ rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
+
+ if (rc != 0) {
+ dev_err(&pdev->dev, "Failed to set PCI DMA mask\n");
+ goto disable_device;
+ }
+
+ atomic_set(&pinstance->outstanding_cmds, 0);
+ hrrqs = pinstance->num_hrrq;
+ rc = pmcraid_register_interrupt_handler(pinstance);
+
+ if (rc) {
+ pmcraid_err("resume: couldn't register interrupt handlers\n");
+ rc = -ENODEV;
+ goto release_host;
+ }
+
+ pmcraid_init_tasklets(pinstance);
+ pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
+
+ /* Start with hard reset sequence which brings up IOA to operational
+ * state as well as completes the reset sequence.
+ */
+ pinstance->ioa_hard_reset = 1;
+
+ /* Start IOA firmware initialization and bring card to Operational
+ * state.
+ */
+ if (pmcraid_reset_bringup(pinstance)) {
+ pmcraid_err("couldn't initialize IOA \n");
+ rc = -ENODEV;
+ goto release_tasklets;
+ }
+
+ return 0;
+
+release_tasklets:
+ pmcraid_kill_tasklets(pinstance);
+ pmcraid_unregister_interrupt_handler(pinstance);
+
+release_host:
+ scsi_host_put(host);
+
+disable_device:
+ pci_disable_device(pdev);
+
+ return rc;
+}
+
+#else
+
+#define pmcraid_suspend NULL
+#define pmcraid_resume NULL
+
+#endif /* CONFIG_PM */
+
+/**
+ * pmcraid_complete_ioa_reset - Called by either timer or tasklet during
+ * completion of the ioa reset
+ * @cmd: pointer to reset command block
+ */
+static void pmcraid_complete_ioa_reset(struct pmcraid_cmd *cmd)
+{
+ struct pmcraid_instance *pinstance = cmd->drv_inst;
+ unsigned long flags;
+
+ spin_lock_irqsave(pinstance->host->host_lock, flags);
+ pmcraid_ioa_reset(cmd);
+ spin_unlock_irqrestore(pinstance->host->host_lock, flags);
+ scsi_unblock_requests(pinstance->host);
+ schedule_work(&pinstance->worker_q);
+}
+
+/**
+ * pmcraid_set_supported_devs - sends SET SUPPORTED DEVICES to IOAFP
+ *
+ * @cmd: pointer to pmcraid_cmd structure
+ *
+ * Return Value
+ * 0 for success or non-zero for failure cases
+ */
+static void pmcraid_set_supported_devs(struct pmcraid_cmd *cmd)
+{
+ struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
+ void (*cmd_done) (struct pmcraid_cmd *) = pmcraid_complete_ioa_reset;
+
+ pmcraid_reinit_cmdblk(cmd);
+
+ ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
+ ioarcb->request_type = REQ_TYPE_IOACMD;
+ ioarcb->cdb[0] = PMCRAID_SET_SUPPORTED_DEVICES;
+ ioarcb->cdb[1] = ALL_DEVICES_SUPPORTED;
+
+ /* If this was called as part of resource table reinitialization due to
+ * lost CCN, it is enough to return the command block back to free pool
+ * as part of set_supported_devs completion function.
+ */
+ if (cmd->drv_inst->reinit_cfg_table) {
+ cmd->drv_inst->reinit_cfg_table = 0;
+ cmd->release = 1;
+ cmd_done = pmcraid_reinit_cfgtable_done;
+ }
+
+ /* we will be done with the reset sequence after set supported devices,
+ * setup the done function to return the command block back to free
+ * pool
+ */
+ pmcraid_send_cmd(cmd,
+ cmd_done,
+ PMCRAID_SET_SUP_DEV_TIMEOUT,
+ pmcraid_timeout_handler);
+ return;
+}
+
+/**
+ * pmcraid_init_res_table - Initialize the resource table
+ * @cmd: pointer to pmcraid command struct
+ *
+ * This function looks through the existing resource table, comparing
+ * it with the config table. This function will take care of old/new
+ * devices and schedule adding/removing them from the mid-layer
+ * as appropriate.
+ *
+ * Return value
+ * None
+ */
+static void pmcraid_init_res_table(struct pmcraid_cmd *cmd)
+{
+ struct pmcraid_instance *pinstance = cmd->drv_inst;
+ struct pmcraid_resource_entry *res, *temp;
+ struct pmcraid_config_table_entry *cfgte;
+ unsigned long lock_flags;
+ int found, rc, i;
+ LIST_HEAD(old_res);
+
+ if (pinstance->cfg_table->flags & MICROCODE_UPDATE_REQUIRED)
+ dev_err(&pinstance->pdev->dev, "Require microcode download\n");
+
+ /* resource list is protected by pinstance->resource_lock.
+ * init_res_table can be called from probe (user-thread) or runtime
+ * reset (timer/tasklet)
+ */
+ spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
+
+ list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue)
+ list_move_tail(&res->queue, &old_res);
+
+ for (i = 0; i < pinstance->cfg_table->num_entries; i++) {
+ cfgte = &pinstance->cfg_table->entries[i];
+
+ if (!pmcraid_expose_resource(cfgte))
+ continue;
+
+ found = 0;
+
+ /* If this entry was already detected and initialized */
+ list_for_each_entry_safe(res, temp, &old_res, queue) {
+
+ rc = memcmp(&res->cfg_entry.resource_address,
+ &cfgte->resource_address,
+ sizeof(cfgte->resource_address));
+ if (!rc) {
+ list_move_tail(&res->queue,
+ &pinstance->used_res_q);
+ found = 1;
+ break;
+ }
+ }
+
+ /* If this is new entry, initialize it and add it the queue */
+ if (!found) {
+
+ if (list_empty(&pinstance->free_res_q)) {
+ dev_err(&pinstance->pdev->dev,
+ "Too many devices attached\n");
+ break;
+ }
+
+ found = 1;
+ res = list_entry(pinstance->free_res_q.next,
+ struct pmcraid_resource_entry, queue);
+
+ res->scsi_dev = NULL;
+ res->change_detected = RES_CHANGE_ADD;
+ res->reset_progress = 0;
+ list_move_tail(&res->queue, &pinstance->used_res_q);
+ }
+
+ /* copy new configuration table entry details into driver
+ * maintained resource entry
+ */
+ if (found) {
+ memcpy(&res->cfg_entry, cfgte,
+ sizeof(struct pmcraid_config_table_entry));
+ pmcraid_info("New res type:%x, vset:%x, addr:%x:\n",
+ res->cfg_entry.resource_type,
+ res->cfg_entry.unique_flags1,
+ le32_to_cpu(res->cfg_entry.resource_address));
+ }
+ }
+
+ /* Detect any deleted entries, mark them for deletion from mid-layer */
+ list_for_each_entry_safe(res, temp, &old_res, queue) {
+
+ if (res->scsi_dev) {
+ res->change_detected = RES_CHANGE_DEL;
+ res->cfg_entry.resource_handle =
+ PMCRAID_INVALID_RES_HANDLE;
+ list_move_tail(&res->queue, &pinstance->used_res_q);
+ } else {
+ list_move_tail(&res->queue, &pinstance->free_res_q);
+ }
+ }
+
+ /* release the resource list lock */
+ spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
+ pmcraid_set_supported_devs(cmd);
+}
+
+/**
+ * pmcraid_querycfg - Send a Query IOA Config to the adapter.
+ * @cmd: pointer pmcraid_cmd struct
+ *
+ * This function sends a Query IOA Configuration command to the adapter to
+ * retrieve the IOA configuration table.
+ *
+ * Return value:
+ * none
+ */
+static void pmcraid_querycfg(struct pmcraid_cmd *cmd)
+{
+ struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
+ struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
+ struct pmcraid_instance *pinstance = cmd->drv_inst;
+ int cfg_table_size = cpu_to_be32(sizeof(struct pmcraid_config_table));
+
+ ioarcb->request_type = REQ_TYPE_IOACMD;
+ ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
+
+ ioarcb->cdb[0] = PMCRAID_QUERY_IOA_CONFIG;
+
+ /* firmware requires 4-byte length field, specified in B.E format */
+ memcpy(&(ioarcb->cdb[10]), &cfg_table_size, sizeof(cfg_table_size));
+
+ /* Since entire config table can be described by single IOADL, it can
+ * be part of IOARCB itself
+ */
+ ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
+ offsetof(struct pmcraid_ioarcb,
+ add_data.u.ioadl[0]));
+ ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
+ ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
+
+ ioarcb->request_flags0 |= NO_LINK_DESCS;
+ ioarcb->data_transfer_length =
+ cpu_to_le32(sizeof(struct pmcraid_config_table));
+
+ ioadl = &(ioarcb->add_data.u.ioadl[0]);
+ ioadl->flags = cpu_to_le32(IOADL_FLAGS_LAST_DESC);
+ ioadl->address = cpu_to_le64(pinstance->cfg_table_bus_addr);
+ ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_config_table));
+
+ pmcraid_send_cmd(cmd, pmcraid_init_res_table,
+ PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
+}
+
+
+/**
+ * pmcraid_probe - PCI probe entry pointer for PMC MaxRaid controller driver
+ * @pdev: pointer to pci device structure
+ * @dev_id: pointer to device ids structure
+ *
+ * Return Value
+ * returns 0 if the device is claimed and successfully configured.
+ * returns non-zero error code in case of any failure
+ */
+static int __devinit pmcraid_probe(
+ struct pci_dev *pdev,
+ const struct pci_device_id *dev_id
+)
+{
+ struct pmcraid_instance *pinstance;
+ struct Scsi_Host *host;
+ void __iomem *mapped_pci_addr;
+ int rc = PCIBIOS_SUCCESSFUL;
+
+ if (atomic_read(&pmcraid_adapter_count) >= PMCRAID_MAX_ADAPTERS) {
+ pmcraid_err
+ ("maximum number(%d) of supported adapters reached\n",
+ atomic_read(&pmcraid_adapter_count));
+ return -ENOMEM;
+ }
+
+ atomic_inc(&pmcraid_adapter_count);
+ rc = pci_enable_device(pdev);
+
+ if (rc) {
+ dev_err(&pdev->dev, "Cannot enable adapter\n");
+ atomic_dec(&pmcraid_adapter_count);
+ return rc;
+ }
+
+ dev_info(&pdev->dev,
+ "Found new IOA(%x:%x), Total IOA count: %d\n",
+ pdev->vendor, pdev->device,
+ atomic_read(&pmcraid_adapter_count));
+
+ rc = pci_request_regions(pdev, PMCRAID_DRIVER_NAME);
+
+ if (rc < 0) {
+ dev_err(&pdev->dev,
+ "Couldn't register memory range of registers\n");
+ goto out_disable_device;
+ }
+
+ mapped_pci_addr = pci_iomap(pdev, 0, 0);
+
+ if (!mapped_pci_addr) {
+ dev_err(&pdev->dev, "Couldn't map PCI registers memory\n");
+ rc = -ENOMEM;
+ goto out_release_regions;
+ }
+
+ pci_set_master(pdev);
+
+ /* Firmware requires the system bus address of IOARCB to be within
+ * 32-bit addressable range though it has 64-bit IOARRIN register.
+ * However, firmware supports 64-bit streaming DMA buffers, whereas
+ * coherent buffers are to be 32-bit. Since pci_alloc_consistent always
+ * returns memory within 4GB (if not, change this logic), coherent
+ * buffers are within firmware acceptible address ranges.
+ */
+ if ((sizeof(dma_addr_t) == 4) ||
+ pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))
+ rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
+
+ /* firmware expects 32-bit DMA addresses for IOARRIN register; set 32
+ * bit mask for pci_alloc_consistent to return addresses within 4GB
+ */
+ if (rc == 0)
+ rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
+
+ if (rc != 0) {
+ dev_err(&pdev->dev, "Failed to set PCI DMA mask\n");
+ goto cleanup_nomem;
+ }
+
+ host = scsi_host_alloc(&pmcraid_host_template,
+ sizeof(struct pmcraid_instance));
+
+ if (!host) {
+ dev_err(&pdev->dev, "scsi_host_alloc failed!\n");
+ rc = -ENOMEM;
+ goto cleanup_nomem;
+ }
+
+ host->max_id = PMCRAID_MAX_NUM_TARGETS_PER_BUS;
+ host->max_lun = PMCRAID_MAX_NUM_LUNS_PER_TARGET;
+ host->unique_id = host->host_no;
+ host->max_channel = PMCRAID_MAX_BUS_TO_SCAN;
+ host->max_cmd_len = PMCRAID_MAX_CDB_LEN;
+
+ /* zero out entire instance structure */
+ pinstance = (struct pmcraid_instance *)host->hostdata;
+ memset(pinstance, 0, sizeof(*pinstance));
+
+ pinstance->chip_cfg =
+ (struct pmcraid_chip_details *)(dev_id->driver_data);
+
+ rc = pmcraid_init_instance(pdev, host, mapped_pci_addr);
+
+ if (rc < 0) {
+ dev_err(&pdev->dev, "failed to initialize adapter instance\n");
+ goto out_scsi_host_put;
+ }
+
+ pci_set_drvdata(pdev, pinstance);
+
+ /* Save PCI config-space for use following the reset */
+ rc = pci_save_state(pinstance->pdev);
+
+ if (rc != 0) {
+ dev_err(&pdev->dev, "Failed to save PCI config space\n");
+ goto out_scsi_host_put;
+ }
+
+ pmcraid_disable_interrupts(pinstance, ~0);
+
+ rc = pmcraid_register_interrupt_handler(pinstance);
+
+ if (rc) {
+ pmcraid_err("couldn't register interrupt handler\n");
+ goto out_scsi_host_put;
+ }
+
+ pmcraid_init_tasklets(pinstance);
+
+ /* allocate verious buffers used by LLD.*/
+ rc = pmcraid_init_buffers(pinstance);
+
+ if (rc) {
+ pmcraid_err("couldn't allocate memory blocks\n");
+ goto out_unregister_isr;
+ }
+
+ /* check the reset type required */
+ pmcraid_reset_type(pinstance);
+
+ pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
+
+ /* Start IOA firmware initialization and bring card to Operational
+ * state.
+ */
+ pmcraid_info("starting IOA initialization sequence\n");
+ if (pmcraid_reset_bringup(pinstance)) {
+ pmcraid_err("couldn't initialize IOA \n");
+ rc = 1;
+ goto out_release_bufs;
+ }
+
+ /* Add adapter instance into mid-layer list */
+ rc = scsi_add_host(pinstance->host, &pdev->dev);
+ if (rc != 0) {
+ pmcraid_err("couldn't add host into mid-layer: %d\n", rc);
+ goto out_release_bufs;
+ }
+
+ scsi_scan_host(pinstance->host);
+
+ rc = pmcraid_setup_chrdev(pinstance);
+
+ if (rc != 0) {
+ pmcraid_err("couldn't create mgmt interface, error: %x\n",
+ rc);
+ goto out_remove_host;
+ }
+
+ /* Schedule worker thread to handle CCN and take care of adding and
+ * removing devices to OS
+ */
+ atomic_set(&pinstance->expose_resources, 1);
+ schedule_work(&pinstance->worker_q);
+ return rc;
+
+out_remove_host:
+ scsi_remove_host(host);
+
+out_release_bufs:
+ pmcraid_release_buffers(pinstance);
+
+out_unregister_isr:
+ pmcraid_kill_tasklets(pinstance);
+ pmcraid_unregister_interrupt_handler(pinstance);
+
+out_scsi_host_put:
+ scsi_host_put(host);
+
+cleanup_nomem:
+ iounmap(mapped_pci_addr);
+
+out_release_regions:
+ pci_release_regions(pdev);
+
+out_disable_device:
+ atomic_dec(&pmcraid_adapter_count);
+ pci_set_drvdata(pdev, NULL);
+ pci_disable_device(pdev);
+ return -ENODEV;
+}
+
+/*
+ * PCI driver structure of pcmraid driver
+ */
+static struct pci_driver pmcraid_driver = {
+ .name = PMCRAID_DRIVER_NAME,
+ .id_table = pmcraid_pci_table,
+ .probe = pmcraid_probe,
+ .remove = pmcraid_remove,
+ .suspend = pmcraid_suspend,
+ .resume = pmcraid_resume,
+ .shutdown = pmcraid_shutdown
+};
+
+
+/**
+ * pmcraid_init - module load entry point
+ */
+static int __init pmcraid_init(void)
+{
+ dev_t dev;
+ int error;
+
+ pmcraid_info("%s Device Driver version: %s %s\n",
+ PMCRAID_DRIVER_NAME,
+ PMCRAID_DRIVER_VERSION, PMCRAID_DRIVER_DATE);
+
+ error = alloc_chrdev_region(&dev, 0,
+ PMCRAID_MAX_ADAPTERS,
+ PMCRAID_DEVFILE);
+
+ if (error) {
+ pmcraid_err("failed to get a major number for adapters\n");
+ goto out_init;
+ }
+
+ pmcraid_major = MAJOR(dev);
+ pmcraid_class = class_create(THIS_MODULE, PMCRAID_DEVFILE);
+
+ if (IS_ERR(pmcraid_class)) {
+ error = PTR_ERR(pmcraid_class);
+ pmcraid_err("failed to register with with sysfs, error = %x\n",
+ error);
+ goto out_unreg_chrdev;
+ }
+
+
+ error = pmcraid_netlink_init();
+
+ if (error)
+ goto out_unreg_chrdev;
+
+ error = pci_register_driver(&pmcraid_driver);
+
+ if (error == 0)
+ goto out_init;
+
+ pmcraid_err("failed to register pmcraid driver, error = %x\n",
+ error);
+ class_destroy(pmcraid_class);
+ pmcraid_netlink_release();
+
+out_unreg_chrdev:
+ unregister_chrdev_region(MKDEV(pmcraid_major, 0), PMCRAID_MAX_ADAPTERS);
+out_init:
+ return error;
+}
+
+/**
+ * pmcraid_exit - module unload entry point
+ */
+static void __exit pmcraid_exit(void)
+{
+ pmcraid_netlink_release();
+ class_destroy(pmcraid_class);
+ unregister_chrdev_region(MKDEV(pmcraid_major, 0),
+ PMCRAID_MAX_ADAPTERS);
+ pci_unregister_driver(&pmcraid_driver);
+}
+
+module_init(pmcraid_init);
+module_exit(pmcraid_exit);