[IA64] hotplug/ia64: SN Hotplug Driver - SN Hotplug Driver code
This patch is the SGI hotplug driver and additional changes required for
the driver. These modifications include changes to the SN io_init.c code
for memory management, the inclusion of new SAL calls to enable and disable
PCI slots, and a hotplug-style driver.
Signed-off-by: Prarit Bhargava <prarit@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
diff --git a/drivers/pci/hotplug/sgi_hotplug.c b/drivers/pci/hotplug/sgi_hotplug.c
new file mode 100644
index 0000000..323041f
--- /dev/null
+++ b/drivers/pci/hotplug/sgi_hotplug.c
@@ -0,0 +1,611 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2005 Silicon Graphics, Inc. All rights reserved.
+ *
+ * This work was based on the 2.4/2.6 kernel development by Dick Reigner.
+ * Work to add BIOS PROM support was completed by Mike Habeck.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/proc_fs.h>
+#include <linux/types.h>
+
+#include <asm/sn/addrs.h>
+#include <asm/sn/l1.h>
+#include <asm/sn/module.h>
+#include <asm/sn/pcibr_provider.h>
+#include <asm/sn/pcibus_provider_defs.h>
+#include <asm/sn/pcidev.h>
+#include <asm/sn/sn_sal.h>
+#include <asm/sn/types.h>
+
+#include "../pci.h"
+#include "pci_hotplug.h"
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("SGI (prarit@sgi.com, dickie@sgi.com, habeck@sgi.com)");
+MODULE_DESCRIPTION("SGI Altix Hot Plug PCI Controller Driver");
+
+#define PCIIO_ASIC_TYPE_TIOCA 4
+#define PCI_SLOT_ALREADY_UP 2 /* slot already up */
+#define PCI_SLOT_ALREADY_DOWN 3 /* slot already down */
+#define PCI_L1_ERR 7 /* L1 console command error */
+#define PCI_EMPTY_33MHZ 15 /* empty 33 MHz bus */
+#define PCI_L1_QSIZE 128 /* our L1 message buffer size */
+#define SN_MAX_HP_SLOTS 32 /* max number of hotplug slots */
+#define SGI_HOTPLUG_PROM_REV 0x0420 /* Min. required PROM version */
+
+/* internal list head */
+static struct list_head sn_hp_list;
+
+/* hotplug_slot struct's private pointer */
+struct slot {
+ int device_num;
+ struct pci_bus *pci_bus;
+ /* this struct for glue internal only */
+ struct hotplug_slot *hotplug_slot;
+ struct list_head hp_list;
+};
+
+struct pcibr_slot_enable_resp {
+ int resp_sub_errno;
+ char resp_l1_msg[PCI_L1_QSIZE + 1];
+};
+
+struct pcibr_slot_disable_resp {
+ int resp_sub_errno;
+ char resp_l1_msg[PCI_L1_QSIZE + 1];
+};
+
+enum sn_pci_req_e {
+ PCI_REQ_SLOT_ELIGIBLE,
+ PCI_REQ_SLOT_DISABLE
+};
+
+static int enable_slot(struct hotplug_slot *slot);
+static int disable_slot(struct hotplug_slot *slot);
+static int get_power_status(struct hotplug_slot *slot, u8 *value);
+
+static struct hotplug_slot_ops sn_hotplug_slot_ops = {
+ .owner = THIS_MODULE,
+ .enable_slot = enable_slot,
+ .disable_slot = disable_slot,
+ .get_power_status = get_power_status,
+};
+
+static DECLARE_MUTEX(sn_hotplug_sem);
+
+static int sn_pci_slot_valid(struct pci_bus *pci_bus, int device)
+{
+ struct pcibus_info *pcibus_info;
+ int bricktype;
+ int bus_num;
+
+ pcibus_info = SN_PCIBUS_BUSSOFT_INFO(pci_bus);
+
+ /* Check to see if this is a valid slot on 'pci_bus' */
+ if (!(pcibus_info->pbi_valid_devices & (1 << device)))
+ return -EPERM;
+
+ bricktype = MODULE_GET_BTYPE(pcibus_info->pbi_moduleid);
+ bus_num = pcibus_info->pbi_buscommon.bs_persist_busnum & 0xf;
+
+ /* Do not allow hotplug operations on base I/O cards */
+ if ((bricktype == L1_BRICKTYPE_IX || bricktype == L1_BRICKTYPE_IA) &&
+ (bus_num == 1 && device != 1))
+ return -EPERM;
+
+ return 1;
+}
+
+static int sn_pci_bus_valid(struct pci_bus *pci_bus)
+{
+ struct pcibus_info *pcibus_info;
+ int asic_type;
+ int bricktype;
+
+ pcibus_info = SN_PCIBUS_BUSSOFT_INFO(pci_bus);
+
+ /* Don't register slots hanging off the TIOCA bus */
+ asic_type = pcibus_info->pbi_buscommon.bs_asic_type;
+ if (asic_type == PCIIO_ASIC_TYPE_TIOCA)
+ return -EPERM;
+
+ /* Only register slots in I/O Bricks that support hotplug */
+ bricktype = MODULE_GET_BTYPE(pcibus_info->pbi_moduleid);
+ switch (bricktype) {
+ case L1_BRICKTYPE_IX:
+ case L1_BRICKTYPE_PX:
+ case L1_BRICKTYPE_IA:
+ case L1_BRICKTYPE_PA:
+ return 1;
+ break;
+ default:
+ return -EPERM;
+ break;
+ }
+
+ return -EIO;
+}
+
+static int sn_hp_slot_private_alloc(struct hotplug_slot *bss_hotplug_slot,
+ struct pci_bus *pci_bus, int device)
+{
+ struct pcibus_info *pcibus_info;
+ struct slot *slot;
+
+ pcibus_info = SN_PCIBUS_BUSSOFT_INFO(pci_bus);
+
+ bss_hotplug_slot->private = kcalloc(1, sizeof(struct slot),
+ GFP_KERNEL);
+ if (!bss_hotplug_slot->private)
+ return -ENOMEM;
+ slot = (struct slot *)bss_hotplug_slot->private;
+
+ bss_hotplug_slot->name = kmalloc(33, GFP_KERNEL);
+ if (!bss_hotplug_slot->name) {
+ kfree(bss_hotplug_slot->private);
+ return -ENOMEM;
+ }
+
+ slot->device_num = device;
+ slot->pci_bus = pci_bus;
+
+ sprintf(bss_hotplug_slot->name, "module_%c%c%c%c%.2d_b_%d_s_%d",
+ '0'+RACK_GET_CLASS(MODULE_GET_RACK(pcibus_info->pbi_moduleid)),
+ '0'+RACK_GET_GROUP(MODULE_GET_RACK(pcibus_info->pbi_moduleid)),
+ '0'+RACK_GET_NUM(MODULE_GET_RACK(pcibus_info->pbi_moduleid)),
+ MODULE_GET_BTCHAR(pcibus_info->pbi_moduleid),
+ MODULE_GET_BPOS(pcibus_info->pbi_moduleid),
+ ((int)pcibus_info->pbi_buscommon.bs_persist_busnum) & 0xf,
+ device + 1);
+
+ slot->hotplug_slot = bss_hotplug_slot;
+ list_add(&slot->hp_list, &sn_hp_list);
+
+ return 0;
+}
+
+static struct hotplug_slot * sn_hp_destroy(void)
+{
+ struct slot *slot;
+ struct list_head *list;
+ struct hotplug_slot *bss_hotplug_slot = NULL;
+
+ list_for_each(list, &sn_hp_list) {
+ slot = list_entry(list, struct slot, hp_list);
+ bss_hotplug_slot = slot->hotplug_slot;
+ list_del(&((struct slot *)bss_hotplug_slot->private)->
+ hp_list);
+ break;
+ }
+ return bss_hotplug_slot;
+}
+
+static void sn_bus_alloc_data(struct pci_dev *dev)
+{
+ struct list_head *node;
+ struct pci_bus *subordinate_bus;
+ struct pci_dev *child;
+
+ sn_pci_fixup_slot(dev);
+
+ /* Recursively sets up the sn_irq_info structs */
+ if (dev->subordinate) {
+ subordinate_bus = dev->subordinate;
+ list_for_each(node, &subordinate_bus->devices) {
+ child = list_entry(node, struct pci_dev, bus_list);
+ sn_bus_alloc_data(child);
+ }
+ }
+}
+
+static void sn_bus_free_data(struct pci_dev *dev)
+{
+ struct list_head *node;
+ struct pci_bus *subordinate_bus;
+ struct pci_dev *child;
+
+ /* Recursively clean up sn_irq_info structs */
+ if (dev->subordinate) {
+ subordinate_bus = dev->subordinate;
+ list_for_each(node, &subordinate_bus->devices) {
+ child = list_entry(node, struct pci_dev, bus_list);
+ sn_bus_free_data(child);
+ }
+ }
+ sn_pci_unfixup_slot(dev);
+}
+
+static u8 sn_power_status_get(struct hotplug_slot *bss_hotplug_slot)
+{
+ struct slot *slot = (struct slot *)bss_hotplug_slot->private;
+ struct pcibus_info *pcibus_info;
+ u8 retval;
+
+ pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
+ retval = pcibus_info->pbi_enabled_devices & (1 << slot->device_num);
+
+ return retval ? 1 : 0;
+}
+
+static void sn_slot_mark_enable(struct hotplug_slot *bss_hotplug_slot,
+ int device_num)
+{
+ struct slot *slot = (struct slot *)bss_hotplug_slot->private;
+ struct pcibus_info *pcibus_info;
+
+ pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
+ pcibus_info->pbi_enabled_devices |= (1 << device_num);
+}
+
+static void sn_slot_mark_disable(struct hotplug_slot *bss_hotplug_slot,
+ int device_num)
+{
+ struct slot *slot = (struct slot *)bss_hotplug_slot->private;
+ struct pcibus_info *pcibus_info;
+
+ pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
+ pcibus_info->pbi_enabled_devices &= ~(1 << device_num);
+}
+
+static int sn_slot_enable(struct hotplug_slot *bss_hotplug_slot,
+ int device_num)
+{
+ struct slot *slot = (struct slot *)bss_hotplug_slot->private;
+ struct pcibus_info *pcibus_info;
+ struct pcibr_slot_enable_resp resp;
+ int rc;
+
+ pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
+
+ /*
+ * Power-on and initialize the slot in the SN
+ * PCI infrastructure.
+ */
+ rc = sal_pcibr_slot_enable(pcibus_info, device_num, &resp);
+
+ if (rc == PCI_SLOT_ALREADY_UP) {
+ dev_dbg(slot->pci_bus->self, "is already active\n");
+ return -EPERM;
+ }
+
+ if (rc == PCI_L1_ERR) {
+ dev_dbg(slot->pci_bus->self,
+ "L1 failure %d with message: %s",
+ resp.resp_sub_errno, resp.resp_l1_msg);
+ return -EPERM;
+ }
+
+ if (rc) {
+ dev_dbg(slot->pci_bus->self,
+ "insert failed with error %d sub-error %d\n",
+ rc, resp.resp_sub_errno);
+ return -EIO;
+ }
+
+ sn_slot_mark_enable(bss_hotplug_slot, device_num);
+
+ return 0;
+}
+
+static int sn_slot_disable(struct hotplug_slot *bss_hotplug_slot,
+ int device_num, int action)
+{
+ struct slot *slot = (struct slot *)bss_hotplug_slot->private;
+ struct pcibus_info *pcibus_info;
+ struct pcibr_slot_disable_resp resp;
+ int rc;
+
+ pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
+
+ rc = sal_pcibr_slot_disable(pcibus_info, device_num, action, &resp);
+
+ if (action == PCI_REQ_SLOT_ELIGIBLE && rc == PCI_SLOT_ALREADY_DOWN) {
+ dev_dbg(slot->pci_bus->self, "Slot %s already inactive\n");
+ return -ENODEV;
+ }
+
+ if (action == PCI_REQ_SLOT_ELIGIBLE && rc == PCI_EMPTY_33MHZ) {
+ dev_dbg(slot->pci_bus->self,
+ "Cannot remove last 33MHz card\n");
+ return -EPERM;
+ }
+
+ if (action == PCI_REQ_SLOT_ELIGIBLE && rc == PCI_L1_ERR) {
+ dev_dbg(slot->pci_bus->self,
+ "L1 failure %d with message \n%s\n",
+ resp.resp_sub_errno, resp.resp_l1_msg);
+ return -EPERM;
+ }
+
+ if (action == PCI_REQ_SLOT_ELIGIBLE && rc) {
+ dev_dbg(slot->pci_bus->self,
+ "remove failed with error %d sub-error %d\n",
+ rc, resp.resp_sub_errno);
+ return -EIO;
+ }
+
+ if (action == PCI_REQ_SLOT_ELIGIBLE && !rc)
+ return 0;
+
+ if (action == PCI_REQ_SLOT_DISABLE && !rc) {
+ sn_slot_mark_disable(bss_hotplug_slot, device_num);
+ dev_dbg(slot->pci_bus->self, "remove successful\n");
+ return 0;
+ }
+
+ if (action == PCI_REQ_SLOT_DISABLE && rc) {
+ dev_dbg(slot->pci_bus->self,"remove failed rc = %d\n", rc);
+ return rc;
+ }
+
+ return rc;
+}
+
+static int enable_slot(struct hotplug_slot *bss_hotplug_slot)
+{
+ struct slot *slot = (struct slot *)bss_hotplug_slot->private;
+ struct pci_bus *new_bus = NULL;
+ struct pci_dev *dev;
+ int func, num_funcs;
+ int new_ppb = 0;
+ int rc;
+
+ /* Serialize the Linux PCI infrastructure */
+ down(&sn_hotplug_sem);
+
+ /*
+ * Power-on and initialize the slot in the SN
+ * PCI infrastructure.
+ */
+ rc = sn_slot_enable(bss_hotplug_slot, slot->device_num);
+ if (rc) {
+ up(&sn_hotplug_sem);
+ return rc;
+ }
+
+ num_funcs = pci_scan_slot(slot->pci_bus, PCI_DEVFN(slot->device_num+1,
+ PCI_FUNC(0)));
+ if (!num_funcs) {
+ dev_dbg(slot->pci_bus->self, "no device in slot\n");
+ up(&sn_hotplug_sem);
+ return -ENODEV;
+ }
+
+ sn_pci_controller_fixup(pci_domain_nr(slot->pci_bus),
+ slot->pci_bus->number,
+ slot->pci_bus);
+ /*
+ * Map SN resources for all functions on the card
+ * to the Linux PCI interface and tell the drivers
+ * about them.
+ */
+ for (func = 0; func < num_funcs; func++) {
+ dev = pci_get_slot(slot->pci_bus,
+ PCI_DEVFN(slot->device_num + 1,
+ PCI_FUNC(func)));
+
+
+ if (dev) {
+ if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
+ unsigned char sec_bus;
+ pci_read_config_byte(dev, PCI_SECONDARY_BUS,
+ &sec_bus);
+ new_bus = pci_add_new_bus(dev->bus, dev,
+ sec_bus);
+ pci_scan_child_bus(new_bus);
+ sn_pci_controller_fixup(pci_domain_nr(new_bus),
+ new_bus->number,
+ new_bus);
+ new_ppb = 1;
+ }
+ sn_bus_alloc_data(dev);
+ pci_dev_put(dev);
+ }
+ }
+
+ /* Call the driver for the new device */
+ pci_bus_add_devices(slot->pci_bus);
+ /* Call the drivers for the new devices subordinate to PPB */
+ if (new_ppb)
+ pci_bus_add_devices(new_bus);
+
+ up(&sn_hotplug_sem);
+
+ if (rc == 0)
+ dev_dbg(slot->pci_bus->self,
+ "insert operation successful\n");
+ else
+ dev_dbg(slot->pci_bus->self,
+ "insert operation failed rc = %d\n", rc);
+
+ return rc;
+}
+
+static int disable_slot(struct hotplug_slot *bss_hotplug_slot)
+{
+ struct slot *slot = (struct slot *)bss_hotplug_slot->private;
+ struct pci_dev *dev;
+ int func;
+ int rc;
+
+ /* Acquire update access to the bus */
+ down(&sn_hotplug_sem);
+
+ /* is it okay to bring this slot down? */
+ rc = sn_slot_disable(bss_hotplug_slot, slot->device_num,
+ PCI_REQ_SLOT_ELIGIBLE);
+ if (rc)
+ goto leaving;
+
+ /* Free the SN resources assigned to the Linux device.*/
+ for (func = 0; func < 8; func++) {
+ dev = pci_get_slot(slot->pci_bus,
+ PCI_DEVFN(slot->device_num+1,
+ PCI_FUNC(func)));
+ if (dev) {
+ /*
+ * Some drivers may use dma accesses during the
+ * driver remove function. We release the sysdata
+ * areas after the driver remove functions have
+ * been called.
+ */
+ sn_bus_store_sysdata(dev);
+ sn_bus_free_data(dev);
+ pci_remove_bus_device(dev);
+ pci_dev_put(dev);
+ }
+ }
+
+ /* free the collected sysdata pointers */
+ sn_bus_free_sysdata();
+
+ /* Deactivate slot */
+ rc = sn_slot_disable(bss_hotplug_slot, slot->device_num,
+ PCI_REQ_SLOT_DISABLE);
+ leaving:
+ /* Release the bus lock */
+ up(&sn_hotplug_sem);
+
+ return rc;
+}
+
+static int get_power_status(struct hotplug_slot *bss_hotplug_slot, u8 *value)
+{
+ down(&sn_hotplug_sem);
+ *value = sn_power_status_get(bss_hotplug_slot);
+ up(&sn_hotplug_sem);
+ return 0;
+}
+
+static void sn_release_slot(struct hotplug_slot *bss_hotplug_slot)
+{
+ kfree(bss_hotplug_slot->info);
+ kfree(bss_hotplug_slot->name);
+ kfree(bss_hotplug_slot->private);
+ kfree(bss_hotplug_slot);
+}
+
+static int sn_hotplug_slot_register(struct pci_bus *pci_bus)
+{
+ int device;
+ struct hotplug_slot *bss_hotplug_slot;
+ int rc = 0;
+
+ /*
+ * Currently only four devices are supported,
+ * in the future there maybe more -- up to 32.
+ */
+
+ for (device = 0; device < SN_MAX_HP_SLOTS ; device++) {
+ if (sn_pci_slot_valid(pci_bus, device) != 1)
+ continue;
+
+ bss_hotplug_slot = kcalloc(1,sizeof(struct hotplug_slot),
+ GFP_KERNEL);
+ if (!bss_hotplug_slot) {
+ rc = -ENOMEM;
+ goto alloc_err;
+ }
+
+ bss_hotplug_slot->info =
+ kcalloc(1,sizeof(struct hotplug_slot_info),
+ GFP_KERNEL);
+ if (!bss_hotplug_slot->info) {
+ rc = -ENOMEM;
+ goto alloc_err;
+ }
+
+ if (sn_hp_slot_private_alloc(bss_hotplug_slot,
+ pci_bus, device)) {
+ rc = -ENOMEM;
+ goto alloc_err;
+ }
+
+ bss_hotplug_slot->ops = &sn_hotplug_slot_ops;
+ bss_hotplug_slot->release = &sn_release_slot;
+
+ rc = pci_hp_register(bss_hotplug_slot);
+ if (rc)
+ goto register_err;
+ }
+ dev_dbg(pci_bus->self, "Registered bus with hotplug\n");
+ return rc;
+
+register_err:
+ dev_dbg(pci_bus->self, "bus failed to register with err = %d\n",
+ rc);
+
+alloc_err:
+ if (rc == -ENOMEM)
+ dev_dbg(pci_bus->self, "Memory allocation error\n");
+
+ /* destroy THIS element */
+ if (bss_hotplug_slot)
+ sn_release_slot(bss_hotplug_slot);
+
+ /* destroy anything else on the list */
+ while ((bss_hotplug_slot = sn_hp_destroy()))
+ pci_hp_deregister(bss_hotplug_slot);
+
+ return rc;
+}
+
+static int sn_pci_hotplug_init(void)
+{
+ struct pci_bus *pci_bus = NULL;
+ int rc;
+ int registered = 0;
+
+ INIT_LIST_HEAD(&sn_hp_list);
+
+ if (sn_sal_rev() < SGI_HOTPLUG_PROM_REV) {
+ printk(KERN_ERR "%s: PROM version must be greater than 4.05\n",
+ __FUNCTION__);
+ return -EPERM;
+ }
+
+ while ((pci_bus = pci_find_next_bus(pci_bus))) {
+ if (!pci_bus->sysdata)
+ continue;
+
+ rc = sn_pci_bus_valid(pci_bus);
+ if (rc != 1) {
+ dev_dbg(pci_bus->self, "not a valid hotplug bus\n");
+ continue;
+ }
+ dev_dbg(pci_bus->self, "valid hotplug bus\n");
+
+ rc = sn_hotplug_slot_register(pci_bus);
+ if (!rc)
+ registered = 1;
+ else {
+ registered = 0;
+ break;
+ }
+ }
+
+ return registered == 1 ? 0 : -ENODEV;
+}
+
+static void sn_pci_hotplug_exit(void)
+{
+ struct hotplug_slot *bss_hotplug_slot;
+
+ while ((bss_hotplug_slot = sn_hp_destroy())) {
+ pci_hp_deregister(bss_hotplug_slot);
+ }
+
+ if (!list_empty(&sn_hp_list))
+ printk(KERN_ERR "%s: internal list is not empty\n", __FILE__);
+}
+
+module_init(sn_pci_hotplug_init);
+module_exit(sn_pci_hotplug_exit);