drivers/dma/ioat/dma.h

   1 /*
   2  * Copyright(c) 2004 - 2009 Intel Corporation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the Free
   6  * Software Foundation; either version 2 of the License, or (at your option)
   7  * any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * The full GNU General Public License is included in this distribution in the
  15  * file called COPYING.
  16  */
  17 #ifndef IOATDMA_H
  18 #define IOATDMA_H
  19
  20 #include <linux/dmaengine.h>
  21 #include <linux/init.h>
  22 #include <linux/dmapool.h>
  23 #include <linux/cache.h>
  24 #include <linux/pci_ids.h>
  25 #include <linux/circ_buf.h>
  26 #include <linux/interrupt.h>
  27 #include "registers.h"
  28 #include "hw.h"
  29
  30 #define IOAT_DMA_VERSION  "4.00"
  31
  32 #define IOAT_DMA_DCA_ANY_CPU            ~0
  33
  34 #define to_ioatdma_device(dev) container_of(dev, struct ioatdma_device, dma_dev)
  35 #define to_dev(ioat_chan) (&(ioat_chan)->ioat_dma->pdev->dev)
  36 #define to_pdev(ioat_chan) ((ioat_chan)->ioat_dma->pdev)
  37
  38 #define chan_num(ch) ((int)((ch)->reg_base - (ch)->ioat_dma->reg_base) / 0x80)
  39
  40 /* ioat hardware assumes at least two sources for raid operations */
  41 #define src_cnt_to_sw(x) ((x) + 2)
  42 #define src_cnt_to_hw(x) ((x) - 2)
  43 #define ndest_to_sw(x) ((x) + 1)
  44 #define ndest_to_hw(x) ((x) - 1)
  45 #define src16_cnt_to_sw(x) ((x) + 9)
  46 #define src16_cnt_to_hw(x) ((x) - 9)
  47
  48 /*
  49  * workaround for IOAT ver.3.0 null descriptor issue
  50  * (channel returns error when size is 0)
  51  */
  52 #define NULL_DESC_BUFFER_SIZE 1
  53
  54 enum ioat_irq_mode {
  55         IOAT_NOIRQ = 0,
  56         IOAT_MSIX,
  57         IOAT_MSI,
  58         IOAT_INTX
  59 };
  60
  61 /**
  62  * struct ioatdma_device - internal representation of a IOAT device
  63  * @pdev: PCI-Express device
  64  * @reg_base: MMIO register space base address
  65  * @completion_pool: DMA buffers for completion ops
  66  * @sed_hw_pool: DMA super descriptor pools
  67  * @dma_dev: embedded struct dma_device
  68  * @version: version of ioatdma device
  69  * @msix_entries: irq handlers
  70  * @idx: per channel data
  71  * @dca: direct cache access context
  72  * @irq_mode: interrupt mode (INTX, MSI, MSIX)
  73  * @cap: read DMA capabilities register
  74  */
  75 struct ioatdma_device {
  76         struct pci_dev *pdev;
  77         void __iomem *reg_base;
  78         struct dma_pool *completion_pool;
  79 #define MAX_SED_POOLS   5
  80         struct dma_pool *sed_hw_pool[MAX_SED_POOLS];
  81         struct dma_device dma_dev;
  82         u8 version;
  83 #define IOAT_MAX_CHANS 4
  84         struct msix_entry msix_entries[IOAT_MAX_CHANS];
  85         struct ioatdma_chan *idx[IOAT_MAX_CHANS];
  86         struct dca_provider *dca;
  87         enum ioat_irq_mode irq_mode;
  88         u32 cap;
  89
  90         /* shadow version for CB3.3 chan reset errata workaround */
  91         u64 msixtba0;
  92         u64 msixdata0;
  93         u32 msixpba;
  94 };
  95
  96 struct ioat_descs {
  97         void *virt;
  98         dma_addr_t hw;
  99 };
 100
 101 struct ioatdma_chan {
 102         struct dma_chan dma_chan;
 103         void __iomem *reg_base;
 104         dma_addr_t last_completion;
 105         spinlock_t cleanup_lock;
 106         unsigned long state;
 107         #define IOAT_CHAN_DOWN 0
 108         #define IOAT_COMPLETION_ACK 1
 109         #define IOAT_RESET_PENDING 2
 110         #define IOAT_KOBJ_INIT_FAIL 3
 111         #define IOAT_RUN 5
 112         #define IOAT_CHAN_ACTIVE 6
 113         struct timer_list timer;
 114         #define COMPLETION_TIMEOUT msecs_to_jiffies(100)
 115         #define IDLE_TIMEOUT msecs_to_jiffies(2000)
 116         #define RESET_DELAY msecs_to_jiffies(100)
 117         struct ioatdma_device *ioat_dma;
 118         dma_addr_t completion_dma;
 119         u64 *completion;
 120         struct tasklet_struct cleanup_task;
 121         struct kobject kobj;
 122
 123 /* ioat v2 / v3 channel attributes
 124  * @xfercap_log; log2 of channel max transfer length (for fast division)
 125  * @head: allocated index
 126  * @issued: hardware notification point
 127  * @tail: cleanup index
 128  * @dmacount: identical to 'head' except for occasionally resetting to zero
 129  * @alloc_order: log2 of the number of allocated descriptors
 130  * @produce: number of descriptors to produce at submit time
 131  * @ring: software ring buffer implementation of hardware ring
 132  * @prep_lock: serializes descriptor preparation (producers)
 133  */
 134         size_t xfercap_log;
 135         u16 head;
 136         u16 issued;
 137         u16 tail;
 138         u16 dmacount;
 139         u16 alloc_order;
 140         u16 produce;
 141         struct ioat_ring_ent **ring;
 142         spinlock_t prep_lock;
 143         struct ioat_descs descs[2];
 144         int desc_chunks;
 145         int intr_coalesce;
 146         int prev_intr_coalesce;
 147 };
 148
 149 struct ioat_sysfs_entry {
 150         struct attribute attr;
 151         ssize_t (*show)(struct dma_chan *, char *);
 152         ssize_t (*store)(struct dma_chan *, const char *, size_t);
 153 };
 154
 155 /**
 156  * struct ioat_sed_ent - wrapper around super extended hardware descriptor
 157  * @hw: hardware SED
 158  * @dma: dma address for the SED
 159  * @parent: point to the dma descriptor that's the parent
 160  * @hw_pool: descriptor pool index
 161  */
 162 struct ioat_sed_ent {
 163         struct ioat_sed_raw_descriptor *hw;
 164         dma_addr_t dma;
 165         struct ioat_ring_ent *parent;
 166         unsigned int hw_pool;
 167 };
 168
 169 /**
 170  * struct ioat_ring_ent - wrapper around hardware descriptor
 171  * @hw: hardware DMA descriptor (for memcpy)
 172  * @xor: hardware xor descriptor
 173  * @xor_ex: hardware xor extension descriptor
 174  * @pq: hardware pq descriptor
 175  * @pq_ex: hardware pq extension descriptor
 176  * @pqu: hardware pq update descriptor
 177  * @raw: hardware raw (un-typed) descriptor
 178  * @txd: the generic software descriptor for all engines
 179  * @len: total transaction length for unmap
 180  * @result: asynchronous result of validate operations
 181  * @id: identifier for debug
 182  * @sed: pointer to super extended descriptor sw desc
 183  */
 184
 185 struct ioat_ring_ent {
 186         union {
 187                 struct ioat_dma_descriptor *hw;
 188                 struct ioat_xor_descriptor *xor;
 189                 struct ioat_xor_ext_descriptor *xor_ex;
 190                 struct ioat_pq_descriptor *pq;
 191                 struct ioat_pq_ext_descriptor *pq_ex;
 192                 struct ioat_pq_update_descriptor *pqu;
 193                 struct ioat_raw_descriptor *raw;
 194         };
 195         size_t len;
 196         struct dma_async_tx_descriptor txd;
 197         enum sum_check_flags *result;
 198         #ifdef DEBUG
 199         int id;
 200         #endif
 201         struct ioat_sed_ent *sed;
 202 };
 203
 204 extern const struct sysfs_ops ioat_sysfs_ops;
 205 extern struct ioat_sysfs_entry ioat_version_attr;
 206 extern struct ioat_sysfs_entry ioat_cap_attr;
 207 extern int ioat_pending_level;
 208 extern int ioat_ring_alloc_order;
 209 extern struct kobj_type ioat_ktype;
 210 extern struct kmem_cache *ioat_cache;
 211 extern int ioat_ring_max_alloc_order;
 212 extern struct kmem_cache *ioat_sed_cache;
 213
 214 static inline struct ioatdma_chan *to_ioat_chan(struct dma_chan *c)
 215 {
 216         return container_of(c, struct ioatdma_chan, dma_chan);
 217 }
 218
 219 /* wrapper around hardware descriptor format + additional software fields */
 220 #ifdef DEBUG
 221 #define set_desc_id(desc, i) ((desc)->id = (i))
 222 #define desc_id(desc) ((desc)->id)
 223 #else
 224 #define set_desc_id(desc, i)
 225 #define desc_id(desc) (0)
 226 #endif
 227
 228 static inline void
 229 __dump_desc_dbg(struct ioatdma_chan *ioat_chan, struct ioat_dma_descriptor *hw,
 230                 struct dma_async_tx_descriptor *tx, int id)
 231 {
 232         struct device *dev = to_dev(ioat_chan);
 233
 234         dev_dbg(dev, "desc[%d]: (%#llx->%#llx) cookie: %d flags: %#x"
 235                 " ctl: %#10.8x (op: %#x int_en: %d compl: %d)\n", id,
 236                 (unsigned long long) tx->phys,
 237                 (unsigned long long) hw->next, tx->cookie, tx->flags,
 238                 hw->ctl, hw->ctl_f.op, hw->ctl_f.int_en, hw->ctl_f.compl_write);
 239 }
 240
 241 #define dump_desc_dbg(c, d) \
 242         ({ if (d) __dump_desc_dbg(c, d->hw, &d->txd, desc_id(d)); 0; })
 243
 244 static inline struct ioatdma_chan *
 245 ioat_chan_by_index(struct ioatdma_device *ioat_dma, int index)
 246 {
 247         return ioat_dma->idx[index];
 248 }
 249
 250 static inline u64 ioat_chansts(struct ioatdma_chan *ioat_chan)
 251 {
 252         return readq(ioat_chan->reg_base + IOAT_CHANSTS_OFFSET);
 253 }
 254
 255 static inline u64 ioat_chansts_to_addr(u64 status)
 256 {
 257         return status & IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR;
 258 }
 259
 260 static inline u32 ioat_chanerr(struct ioatdma_chan *ioat_chan)
 261 {
 262         return readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
 263 }
 264
 265 static inline void ioat_suspend(struct ioatdma_chan *ioat_chan)
 266 {
 267         u8 ver = ioat_chan->ioat_dma->version;
 268
 269         writeb(IOAT_CHANCMD_SUSPEND,
 270                ioat_chan->reg_base + IOAT_CHANCMD_OFFSET(ver));
 271 }
 272
 273 static inline void ioat_reset(struct ioatdma_chan *ioat_chan)
 274 {
 275         u8 ver = ioat_chan->ioat_dma->version;
 276
 277         writeb(IOAT_CHANCMD_RESET,
 278                ioat_chan->reg_base + IOAT_CHANCMD_OFFSET(ver));
 279 }
 280
 281 static inline bool ioat_reset_pending(struct ioatdma_chan *ioat_chan)
 282 {
 283         u8 ver = ioat_chan->ioat_dma->version;
 284         u8 cmd;
 285
 286         cmd = readb(ioat_chan->reg_base + IOAT_CHANCMD_OFFSET(ver));
 287         return (cmd & IOAT_CHANCMD_RESET) == IOAT_CHANCMD_RESET;
 288 }
 289
 290 static inline bool is_ioat_active(unsigned long status)
 291 {
 292         return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_ACTIVE);
 293 }
 294
 295 static inline bool is_ioat_idle(unsigned long status)
 296 {
 297         return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_DONE);
 298 }
 299
 300 static inline bool is_ioat_halted(unsigned long status)
 301 {
 302         return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_HALTED);
 303 }
 304
 305 static inline bool is_ioat_suspended(unsigned long status)
 306 {
 307         return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_SUSPENDED);
 308 }
 309
 310 /* channel was fatally programmed */
 311 static inline bool is_ioat_bug(unsigned long err)
 312 {
 313         return !!err;
 314 }
 315
 316 #define IOAT_MAX_ORDER 16
 317 #define IOAT_MAX_DESCS 65536
 318 #define IOAT_DESCS_PER_2M 32768
 319
 320 static inline u32 ioat_ring_size(struct ioatdma_chan *ioat_chan)
 321 {
 322         return 1 << ioat_chan->alloc_order;
 323 }
 324
 325 /* count of descriptors in flight with the engine */
 326 static inline u16 ioat_ring_active(struct ioatdma_chan *ioat_chan)
 327 {
 328         return CIRC_CNT(ioat_chan->head, ioat_chan->tail,
 329                         ioat_ring_size(ioat_chan));
 330 }
 331
 332 /* count of descriptors pending submission to hardware */
 333 static inline u16 ioat_ring_pending(struct ioatdma_chan *ioat_chan)
 334 {
 335         return CIRC_CNT(ioat_chan->head, ioat_chan->issued,
 336                         ioat_ring_size(ioat_chan));
 337 }
 338
 339 static inline u32 ioat_ring_space(struct ioatdma_chan *ioat_chan)
 340 {
 341         return ioat_ring_size(ioat_chan) - ioat_ring_active(ioat_chan);
 342 }
 343
 344 static inline u16
 345 ioat_xferlen_to_descs(struct ioatdma_chan *ioat_chan, size_t len)
 346 {
 347         u16 num_descs = len >> ioat_chan->xfercap_log;
 348
 349         num_descs += !!(len & ((1 << ioat_chan->xfercap_log) - 1));
 350         return num_descs;
 351 }
 352
 353 static inline struct ioat_ring_ent *
 354 ioat_get_ring_ent(struct ioatdma_chan *ioat_chan, u16 idx)
 355 {
 356         return ioat_chan->ring[idx & (ioat_ring_size(ioat_chan) - 1)];
 357 }
 358
 359 static inline void
 360 ioat_set_chainaddr(struct ioatdma_chan *ioat_chan, u64 addr)
 361 {
 362         writel(addr & 0x00000000FFFFFFFF,
 363                ioat_chan->reg_base + IOAT2_CHAINADDR_OFFSET_LOW);
 364         writel(addr >> 32,
 365                ioat_chan->reg_base + IOAT2_CHAINADDR_OFFSET_HIGH);
 366 }
 367
 368 /* IOAT Prep functions */
 369 struct dma_async_tx_descriptor *
 370 ioat_dma_prep_memcpy_lock(struct dma_chan *c, dma_addr_t dma_dest,
 371                            dma_addr_t dma_src, size_t len, unsigned long flags);
 372 struct dma_async_tx_descriptor *
 373 ioat_prep_interrupt_lock(struct dma_chan *c, unsigned long flags);
 374 struct dma_async_tx_descriptor *
 375 ioat_prep_xor(struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src,
 376                unsigned int src_cnt, size_t len, unsigned long flags);
 377 struct dma_async_tx_descriptor *
 378 ioat_prep_xor_val(struct dma_chan *chan, dma_addr_t *src,
 379                     unsigned int src_cnt, size_t len,
 380                     enum sum_check_flags *result, unsigned long flags);
 381 struct dma_async_tx_descriptor *
 382 ioat_prep_pq(struct dma_chan *chan, dma_addr_t *dst, dma_addr_t *src,
 383               unsigned int src_cnt, const unsigned char *scf, size_t len,
 384               unsigned long flags);
 385 struct dma_async_tx_descriptor *
 386 ioat_prep_pq_val(struct dma_chan *chan, dma_addr_t *pq, dma_addr_t *src,
 387                   unsigned int src_cnt, const unsigned char *scf, size_t len,
 388                   enum sum_check_flags *pqres, unsigned long flags);
 389 struct dma_async_tx_descriptor *
 390 ioat_prep_pqxor(struct dma_chan *chan, dma_addr_t dst, dma_addr_t *src,
 391                  unsigned int src_cnt, size_t len, unsigned long flags);
 392 struct dma_async_tx_descriptor *
 393 ioat_prep_pqxor_val(struct dma_chan *chan, dma_addr_t *src,
 394                      unsigned int src_cnt, size_t len,
 395                      enum sum_check_flags *result, unsigned long flags);
 396
 397 /* IOAT Operation functions */
 398 irqreturn_t ioat_dma_do_interrupt(int irq, void *data);
 399 irqreturn_t ioat_dma_do_interrupt_msix(int irq, void *data);
 400 struct ioat_ring_ent **
 401 ioat_alloc_ring(struct dma_chan *c, int order, gfp_t flags);
 402 void ioat_start_null_desc(struct ioatdma_chan *ioat_chan);
 403 void ioat_free_ring_ent(struct ioat_ring_ent *desc, struct dma_chan *chan);
 404 int ioat_reset_hw(struct ioatdma_chan *ioat_chan);
 405 enum dma_status
 406 ioat_tx_status(struct dma_chan *c, dma_cookie_t cookie,
 407                 struct dma_tx_state *txstate);
 408 void ioat_cleanup_event(unsigned long data);
 409 void ioat_timer_event(unsigned long data);
 410 int ioat_check_space_lock(struct ioatdma_chan *ioat_chan, int num_descs);
 411 void ioat_issue_pending(struct dma_chan *chan);
 412 void ioat_timer_event(unsigned long data);
 413
 414 /* IOAT Init functions */
 415 bool is_bwd_ioat(struct pci_dev *pdev);
 416 struct dca_provider *ioat_dca_init(struct pci_dev *pdev, void __iomem *iobase);
 417 void ioat_kobject_add(struct ioatdma_device *ioat_dma, struct kobj_type *type);
 418 void ioat_kobject_del(struct ioatdma_device *ioat_dma);
 419 int ioat_dma_setup_interrupts(struct ioatdma_device *ioat_dma);
 420 void ioat_stop(struct ioatdma_chan *ioat_chan);
 421 #endif /* IOATDMA_H */