| /* |
| * Copyright(c) 2004 - 2009 Intel Corporation. All rights reserved. |
| * |
| * 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. |
| * |
| * The full GNU General Public License is included in this distribution in the |
| * file called COPYING. |
| */ |
| #ifndef IOATDMA_H |
| #define IOATDMA_H |
| |
| #include <linux/dmaengine.h> |
| #include <linux/init.h> |
| #include <linux/dmapool.h> |
| #include <linux/cache.h> |
| #include <linux/pci_ids.h> |
| #include <linux/circ_buf.h> |
| #include <linux/interrupt.h> |
| #include "registers.h" |
| #include "hw.h" |
| |
| #define IOAT_DMA_VERSION "4.00" |
| |
| #define IOAT_DMA_DCA_ANY_CPU ~0 |
| |
| #define to_ioatdma_device(dev) container_of(dev, struct ioatdma_device, dma_dev) |
| #define to_dev(ioat_chan) (&(ioat_chan)->ioat_dma->pdev->dev) |
| #define to_pdev(ioat_chan) ((ioat_chan)->ioat_dma->pdev) |
| |
| #define chan_num(ch) ((int)((ch)->reg_base - (ch)->ioat_dma->reg_base) / 0x80) |
| |
| /* ioat hardware assumes at least two sources for raid operations */ |
| #define src_cnt_to_sw(x) ((x) + 2) |
| #define src_cnt_to_hw(x) ((x) - 2) |
| #define ndest_to_sw(x) ((x) + 1) |
| #define ndest_to_hw(x) ((x) - 1) |
| #define src16_cnt_to_sw(x) ((x) + 9) |
| #define src16_cnt_to_hw(x) ((x) - 9) |
| |
| /* |
| * workaround for IOAT ver.3.0 null descriptor issue |
| * (channel returns error when size is 0) |
| */ |
| #define NULL_DESC_BUFFER_SIZE 1 |
| |
| enum ioat_irq_mode { |
| IOAT_NOIRQ = 0, |
| IOAT_MSIX, |
| IOAT_MSI, |
| IOAT_INTX |
| }; |
| |
| /** |
| * struct ioatdma_device - internal representation of a IOAT device |
| * @pdev: PCI-Express device |
| * @reg_base: MMIO register space base address |
| * @dma_pool: for allocating DMA descriptors |
| * @dma_dev: embedded struct dma_device |
| * @version: version of ioatdma device |
| * @msix_entries: irq handlers |
| * @idx: per channel data |
| * @dca: direct cache access context |
| */ |
| struct ioatdma_device { |
| struct pci_dev *pdev; |
| void __iomem *reg_base; |
| struct pci_pool *dma_pool; |
| struct pci_pool *completion_pool; |
| #define MAX_SED_POOLS 5 |
| struct dma_pool *sed_hw_pool[MAX_SED_POOLS]; |
| struct dma_device dma_dev; |
| u8 version; |
| struct msix_entry msix_entries[4]; |
| struct ioatdma_chan *idx[4]; |
| struct dca_provider *dca; |
| enum ioat_irq_mode irq_mode; |
| u32 cap; |
| }; |
| |
| struct ioatdma_chan { |
| struct dma_chan dma_chan; |
| void __iomem *reg_base; |
| dma_addr_t last_completion; |
| spinlock_t cleanup_lock; |
| unsigned long state; |
| #define IOAT_COMPLETION_PENDING 0 |
| #define IOAT_COMPLETION_ACK 1 |
| #define IOAT_RESET_PENDING 2 |
| #define IOAT_KOBJ_INIT_FAIL 3 |
| #define IOAT_RESHAPE_PENDING 4 |
| #define IOAT_RUN 5 |
| #define IOAT_CHAN_ACTIVE 6 |
| struct timer_list timer; |
| #define COMPLETION_TIMEOUT msecs_to_jiffies(100) |
| #define IDLE_TIMEOUT msecs_to_jiffies(2000) |
| #define RESET_DELAY msecs_to_jiffies(100) |
| struct ioatdma_device *ioat_dma; |
| dma_addr_t completion_dma; |
| u64 *completion; |
| struct tasklet_struct cleanup_task; |
| struct kobject kobj; |
| |
| /* ioat v2 / v3 channel attributes |
| * @xfercap_log; log2 of channel max transfer length (for fast division) |
| * @head: allocated index |
| * @issued: hardware notification point |
| * @tail: cleanup index |
| * @dmacount: identical to 'head' except for occasionally resetting to zero |
| * @alloc_order: log2 of the number of allocated descriptors |
| * @produce: number of descriptors to produce at submit time |
| * @ring: software ring buffer implementation of hardware ring |
| * @prep_lock: serializes descriptor preparation (producers) |
| */ |
| size_t xfercap_log; |
| u16 head; |
| u16 issued; |
| u16 tail; |
| u16 dmacount; |
| u16 alloc_order; |
| u16 produce; |
| struct ioat_ring_ent **ring; |
| spinlock_t prep_lock; |
| }; |
| |
| struct ioat_sysfs_entry { |
| struct attribute attr; |
| ssize_t (*show)(struct dma_chan *, char *); |
| }; |
| |
| /** |
| * struct ioat_sed_ent - wrapper around super extended hardware descriptor |
| * @hw: hardware SED |
| * @sed_dma: dma address for the SED |
| * @list: list member |
| * @parent: point to the dma descriptor that's the parent |
| */ |
| struct ioat_sed_ent { |
| struct ioat_sed_raw_descriptor *hw; |
| dma_addr_t dma; |
| struct ioat_ring_ent *parent; |
| unsigned int hw_pool; |
| }; |
| |
| /** |
| * struct ioat_ring_ent - wrapper around hardware descriptor |
| * @hw: hardware DMA descriptor (for memcpy) |
| * @fill: hardware fill descriptor |
| * @xor: hardware xor descriptor |
| * @xor_ex: hardware xor extension descriptor |
| * @pq: hardware pq descriptor |
| * @pq_ex: hardware pq extension descriptor |
| * @pqu: hardware pq update descriptor |
| * @raw: hardware raw (un-typed) descriptor |
| * @txd: the generic software descriptor for all engines |
| * @len: total transaction length for unmap |
| * @result: asynchronous result of validate operations |
| * @id: identifier for debug |
| */ |
| |
| struct ioat_ring_ent { |
| union { |
| struct ioat_dma_descriptor *hw; |
| struct ioat_xor_descriptor *xor; |
| struct ioat_xor_ext_descriptor *xor_ex; |
| struct ioat_pq_descriptor *pq; |
| struct ioat_pq_ext_descriptor *pq_ex; |
| struct ioat_pq_update_descriptor *pqu; |
| struct ioat_raw_descriptor *raw; |
| }; |
| size_t len; |
| struct dma_async_tx_descriptor txd; |
| enum sum_check_flags *result; |
| #ifdef DEBUG |
| int id; |
| #endif |
| struct ioat_sed_ent *sed; |
| }; |
| |
| extern const struct sysfs_ops ioat_sysfs_ops; |
| extern struct ioat_sysfs_entry ioat_version_attr; |
| extern struct ioat_sysfs_entry ioat_cap_attr; |
| extern int ioat_pending_level; |
| extern int ioat_ring_alloc_order; |
| extern struct kobj_type ioat_ktype; |
| extern struct kmem_cache *ioat_cache; |
| extern int ioat_ring_max_alloc_order; |
| extern struct kmem_cache *ioat_sed_cache; |
| |
| static inline struct ioatdma_chan *to_ioat_chan(struct dma_chan *c) |
| { |
| return container_of(c, struct ioatdma_chan, dma_chan); |
| } |
| |
| /* wrapper around hardware descriptor format + additional software fields */ |
| #ifdef DEBUG |
| #define set_desc_id(desc, i) ((desc)->id = (i)) |
| #define desc_id(desc) ((desc)->id) |
| #else |
| #define set_desc_id(desc, i) |
| #define desc_id(desc) (0) |
| #endif |
| |
| static inline void |
| __dump_desc_dbg(struct ioatdma_chan *ioat_chan, struct ioat_dma_descriptor *hw, |
| struct dma_async_tx_descriptor *tx, int id) |
| { |
| struct device *dev = to_dev(ioat_chan); |
| |
| dev_dbg(dev, "desc[%d]: (%#llx->%#llx) cookie: %d flags: %#x" |
| " ctl: %#10.8x (op: %#x int_en: %d compl: %d)\n", id, |
| (unsigned long long) tx->phys, |
| (unsigned long long) hw->next, tx->cookie, tx->flags, |
| hw->ctl, hw->ctl_f.op, hw->ctl_f.int_en, hw->ctl_f.compl_write); |
| } |
| |
| #define dump_desc_dbg(c, d) \ |
| ({ if (d) __dump_desc_dbg(c, d->hw, &d->txd, desc_id(d)); 0; }) |
| |
| static inline struct ioatdma_chan * |
| ioat_chan_by_index(struct ioatdma_device *ioat_dma, int index) |
| { |
| return ioat_dma->idx[index]; |
| } |
| |
| static inline u64 ioat_chansts_32(struct ioatdma_chan *ioat_chan) |
| { |
| u8 ver = ioat_chan->ioat_dma->version; |
| u64 status; |
| u32 status_lo; |
| |
| /* We need to read the low address first as this causes the |
| * chipset to latch the upper bits for the subsequent read |
| */ |
| status_lo = readl(ioat_chan->reg_base + IOAT_CHANSTS_OFFSET_LOW(ver)); |
| status = readl(ioat_chan->reg_base + IOAT_CHANSTS_OFFSET_HIGH(ver)); |
| status <<= 32; |
| status |= status_lo; |
| |
| return status; |
| } |
| |
| #if BITS_PER_LONG == 64 |
| |
| static inline u64 ioat_chansts(struct ioatdma_chan *ioat_chan) |
| { |
| u8 ver = ioat_chan->ioat_dma->version; |
| u64 status; |
| |
| /* With IOAT v3.3 the status register is 64bit. */ |
| if (ver >= IOAT_VER_3_3) |
| status = readq(ioat_chan->reg_base + IOAT_CHANSTS_OFFSET(ver)); |
| else |
| status = ioat_chansts_32(ioat_chan); |
| |
| return status; |
| } |
| |
| #else |
| #define ioat_chansts ioat_chansts_32 |
| #endif |
| |
| static inline u64 ioat_chansts_to_addr(u64 status) |
| { |
| return status & IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR; |
| } |
| |
| static inline u32 ioat_chanerr(struct ioatdma_chan *ioat_chan) |
| { |
| return readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET); |
| } |
| |
| static inline void ioat_suspend(struct ioatdma_chan *ioat_chan) |
| { |
| u8 ver = ioat_chan->ioat_dma->version; |
| |
| writeb(IOAT_CHANCMD_SUSPEND, |
| ioat_chan->reg_base + IOAT_CHANCMD_OFFSET(ver)); |
| } |
| |
| static inline void ioat_reset(struct ioatdma_chan *ioat_chan) |
| { |
| u8 ver = ioat_chan->ioat_dma->version; |
| |
| writeb(IOAT_CHANCMD_RESET, |
| ioat_chan->reg_base + IOAT_CHANCMD_OFFSET(ver)); |
| } |
| |
| static inline bool ioat_reset_pending(struct ioatdma_chan *ioat_chan) |
| { |
| u8 ver = ioat_chan->ioat_dma->version; |
| u8 cmd; |
| |
| cmd = readb(ioat_chan->reg_base + IOAT_CHANCMD_OFFSET(ver)); |
| return (cmd & IOAT_CHANCMD_RESET) == IOAT_CHANCMD_RESET; |
| } |
| |
| static inline bool is_ioat_active(unsigned long status) |
| { |
| return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_ACTIVE); |
| } |
| |
| static inline bool is_ioat_idle(unsigned long status) |
| { |
| return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_DONE); |
| } |
| |
| static inline bool is_ioat_halted(unsigned long status) |
| { |
| return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_HALTED); |
| } |
| |
| static inline bool is_ioat_suspended(unsigned long status) |
| { |
| return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_SUSPENDED); |
| } |
| |
| /* channel was fatally programmed */ |
| static inline bool is_ioat_bug(unsigned long err) |
| { |
| return !!err; |
| } |
| |
| #define IOAT_MAX_ORDER 16 |
| #define ioat_get_alloc_order() \ |
| (min(ioat_ring_alloc_order, IOAT_MAX_ORDER)) |
| #define ioat_get_max_alloc_order() \ |
| (min(ioat_ring_max_alloc_order, IOAT_MAX_ORDER)) |
| |
| static inline u32 ioat_ring_size(struct ioatdma_chan *ioat_chan) |
| { |
| return 1 << ioat_chan->alloc_order; |
| } |
| |
| /* count of descriptors in flight with the engine */ |
| static inline u16 ioat_ring_active(struct ioatdma_chan *ioat_chan) |
| { |
| return CIRC_CNT(ioat_chan->head, ioat_chan->tail, |
| ioat_ring_size(ioat_chan)); |
| } |
| |
| /* count of descriptors pending submission to hardware */ |
| static inline u16 ioat_ring_pending(struct ioatdma_chan *ioat_chan) |
| { |
| return CIRC_CNT(ioat_chan->head, ioat_chan->issued, |
| ioat_ring_size(ioat_chan)); |
| } |
| |
| static inline u32 ioat_ring_space(struct ioatdma_chan *ioat_chan) |
| { |
| return ioat_ring_size(ioat_chan) - ioat_ring_active(ioat_chan); |
| } |
| |
| static inline u16 |
| ioat_xferlen_to_descs(struct ioatdma_chan *ioat_chan, size_t len) |
| { |
| u16 num_descs = len >> ioat_chan->xfercap_log; |
| |
| num_descs += !!(len & ((1 << ioat_chan->xfercap_log) - 1)); |
| return num_descs; |
| } |
| |
| static inline struct ioat_ring_ent * |
| ioat_get_ring_ent(struct ioatdma_chan *ioat_chan, u16 idx) |
| { |
| return ioat_chan->ring[idx & (ioat_ring_size(ioat_chan) - 1)]; |
| } |
| |
| static inline void |
| ioat_set_chainaddr(struct ioatdma_chan *ioat_chan, u64 addr) |
| { |
| writel(addr & 0x00000000FFFFFFFF, |
| ioat_chan->reg_base + IOAT2_CHAINADDR_OFFSET_LOW); |
| writel(addr >> 32, |
| ioat_chan->reg_base + IOAT2_CHAINADDR_OFFSET_HIGH); |
| } |
| |
| /* IOAT Prep functions */ |
| struct dma_async_tx_descriptor * |
| ioat_dma_prep_memcpy_lock(struct dma_chan *c, dma_addr_t dma_dest, |
| dma_addr_t dma_src, size_t len, unsigned long flags); |
| struct dma_async_tx_descriptor * |
| ioat_prep_interrupt_lock(struct dma_chan *c, unsigned long flags); |
| struct dma_async_tx_descriptor * |
| ioat_prep_xor(struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src, |
| unsigned int src_cnt, size_t len, unsigned long flags); |
| struct dma_async_tx_descriptor * |
| ioat_prep_xor_val(struct dma_chan *chan, dma_addr_t *src, |
| unsigned int src_cnt, size_t len, |
| enum sum_check_flags *result, unsigned long flags); |
| struct dma_async_tx_descriptor * |
| ioat_prep_pq(struct dma_chan *chan, dma_addr_t *dst, dma_addr_t *src, |
| unsigned int src_cnt, const unsigned char *scf, size_t len, |
| unsigned long flags); |
| struct dma_async_tx_descriptor * |
| ioat_prep_pq_val(struct dma_chan *chan, dma_addr_t *pq, dma_addr_t *src, |
| unsigned int src_cnt, const unsigned char *scf, size_t len, |
| enum sum_check_flags *pqres, unsigned long flags); |
| struct dma_async_tx_descriptor * |
| ioat_prep_pqxor(struct dma_chan *chan, dma_addr_t dst, dma_addr_t *src, |
| unsigned int src_cnt, size_t len, unsigned long flags); |
| struct dma_async_tx_descriptor * |
| ioat_prep_pqxor_val(struct dma_chan *chan, dma_addr_t *src, |
| unsigned int src_cnt, size_t len, |
| enum sum_check_flags *result, unsigned long flags); |
| |
| /* IOAT Operation functions */ |
| irqreturn_t ioat_dma_do_interrupt(int irq, void *data); |
| irqreturn_t ioat_dma_do_interrupt_msix(int irq, void *data); |
| struct ioat_ring_ent ** |
| ioat_alloc_ring(struct dma_chan *c, int order, gfp_t flags); |
| void ioat_start_null_desc(struct ioatdma_chan *ioat_chan); |
| void ioat_free_ring_ent(struct ioat_ring_ent *desc, struct dma_chan *chan); |
| int ioat_reset_hw(struct ioatdma_chan *ioat_chan); |
| enum dma_status |
| ioat_tx_status(struct dma_chan *c, dma_cookie_t cookie, |
| struct dma_tx_state *txstate); |
| void ioat_cleanup_event(unsigned long data); |
| void ioat_timer_event(unsigned long data); |
| int ioat_check_space_lock(struct ioatdma_chan *ioat_chan, int num_descs); |
| void ioat_issue_pending(struct dma_chan *chan); |
| void ioat_timer_event(unsigned long data); |
| |
| /* IOAT Init functions */ |
| bool is_bwd_ioat(struct pci_dev *pdev); |
| struct dca_provider *ioat_dca_init(struct pci_dev *pdev, void __iomem *iobase); |
| void ioat_kobject_add(struct ioatdma_device *ioat_dma, struct kobj_type *type); |
| void ioat_kobject_del(struct ioatdma_device *ioat_dma); |
| int ioat_dma_setup_interrupts(struct ioatdma_device *ioat_dma); |
| void ioat_stop(struct ioatdma_chan *ioat_chan); |
| #endif /* IOATDMA_H */ |