drivers/dma/ioat/dma.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * Copyright(c) 2004 - 2009 Intel Corporation. All rights reserved.
   4  */
   5 #ifndef IOATDMA_H
   6 #define IOATDMA_H
   7
   8 #include <linux/dmaengine.h>
   9 #include <linux/init.h>
  10 #include <linux/dmapool.h>
  11 #include <linux/cache.h>
  12 #include <linux/pci_ids.h>
  13 #include <linux/circ_buf.h>
  14 #include <linux/interrupt.h>
  15 #include "registers.h"
  16 #include "hw.h"
  17
  18 #define IOAT_DMA_VERSION  "5.00"
  19
  20 #define IOAT_DMA_DCA_ANY_CPU            ~0
  21
  22 #define to_ioatdma_device(dev) container_of(dev, struct ioatdma_device, dma_dev)
  23 #define to_dev(ioat_chan) (&(ioat_chan)->ioat_dma->pdev->dev)
  24 #define to_pdev(ioat_chan) ((ioat_chan)->ioat_dma->pdev)
  25
  26 #define chan_num(ch) ((int)((ch)->reg_base - (ch)->ioat_dma->reg_base) / 0x80)
  27
  28 /* ioat hardware assumes at least two sources for raid operations */
  29 #define src_cnt_to_sw(x) ((x) + 2)
  30 #define src_cnt_to_hw(x) ((x) - 2)
  31 #define ndest_to_sw(x) ((x) + 1)
  32 #define ndest_to_hw(x) ((x) - 1)
  33 #define src16_cnt_to_sw(x) ((x) + 9)
  34 #define src16_cnt_to_hw(x) ((x) - 9)
  35
  36 /*
  37  * workaround for IOAT ver.3.0 null descriptor issue
  38  * (channel returns error when size is 0)
  39  */
  40 #define NULL_DESC_BUFFER_SIZE 1
  41
  42 enum ioat_irq_mode {
  43         IOAT_NOIRQ = 0,
  44         IOAT_MSIX,
  45         IOAT_MSI,
  46         IOAT_INTX
  47 };
  48
  49 /**
  50  * struct ioatdma_device - internal representation of a IOAT device
  51  * @pdev: PCI-Express device
  52  * @reg_base: MMIO register space base address
  53  * @completion_pool: DMA buffers for completion ops
  54  * @sed_hw_pool: DMA super descriptor pools
  55  * @dma_dev: embedded struct dma_device
  56  * @version: version of ioatdma device
  57  * @msix_entries: irq handlers
  58  * @idx: per channel data
  59  * @dca: direct cache access context
  60  * @irq_mode: interrupt mode (INTX, MSI, MSIX)
  61  * @cap: read DMA capabilities register
  62  */
  63 struct ioatdma_device {
  64         struct pci_dev *pdev;
  65         void __iomem *reg_base;
  66         struct dma_pool *completion_pool;
  67 #define MAX_SED_POOLS   5
  68         struct dma_pool *sed_hw_pool[MAX_SED_POOLS];
  69         struct dma_device dma_dev;
  70         u8 version;
  71 #define IOAT_MAX_CHANS 4
  72         struct msix_entry msix_entries[IOAT_MAX_CHANS];
  73         struct ioatdma_chan *idx[IOAT_MAX_CHANS];
  74         struct dca_provider *dca;
  75         enum ioat_irq_mode irq_mode;
  76         u32 cap;
  77         int chancnt;
  78
  79         /* shadow version for CB3.3 chan reset errata workaround */
  80         u64 msixtba0;
  81         u64 msixdata0;
  82         u32 msixpba;
  83 };
  84
  85 #define IOAT_MAX_ORDER 16
  86 #define IOAT_MAX_DESCS (1 << IOAT_MAX_ORDER)
  87 #define IOAT_CHUNK_SIZE (SZ_512K)
  88 #define IOAT_DESCS_PER_CHUNK (IOAT_CHUNK_SIZE / IOAT_DESC_SZ)
  89
  90 struct ioat_descs {
  91         void *virt;
  92         dma_addr_t hw;
  93 };
  94
  95 struct ioatdma_chan {
  96         struct dma_chan dma_chan;
  97         void __iomem *reg_base;
  98         dma_addr_t last_completion;
  99         spinlock_t cleanup_lock;
 100         unsigned long state;
 101         #define IOAT_CHAN_DOWN 0
 102         #define IOAT_COMPLETION_ACK 1
 103         #define IOAT_RESET_PENDING 2
 104         #define IOAT_KOBJ_INIT_FAIL 3
 105         #define IOAT_RUN 5
 106         #define IOAT_CHAN_ACTIVE 6
 107         struct timer_list timer;
 108         #define RESET_DELAY msecs_to_jiffies(100)
 109         struct ioatdma_device *ioat_dma;
 110         dma_addr_t completion_dma;
 111         u64 *completion;
 112         struct tasklet_struct cleanup_task;
 113         struct kobject kobj;
 114
 115 /* ioat v2 / v3 channel attributes
 116  * @xfercap_log; log2 of channel max transfer length (for fast division)
 117  * @head: allocated index
 118  * @issued: hardware notification point
 119  * @tail: cleanup index
 120  * @dmacount: identical to 'head' except for occasionally resetting to zero
 121  * @alloc_order: log2 of the number of allocated descriptors
 122  * @produce: number of descriptors to produce at submit time
 123  * @ring: software ring buffer implementation of hardware ring
 124  * @prep_lock: serializes descriptor preparation (producers)
 125  */
 126         size_t xfercap_log;
 127         u16 head;
 128         u16 issued;
 129         u16 tail;
 130         u16 dmacount;
 131         u16 alloc_order;
 132         u16 produce;
 133         struct ioat_ring_ent **ring;
 134         spinlock_t prep_lock;
 135         struct ioat_descs descs[IOAT_MAX_DESCS / IOAT_DESCS_PER_CHUNK];
 136         int desc_chunks;
 137         int intr_coalesce;
 138         int prev_intr_coalesce;
 139 };
 140
 141 struct ioat_sysfs_entry {
 142         struct attribute attr;
 143         ssize_t (*show)(struct dma_chan *, char *);
 144         ssize_t (*store)(struct dma_chan *, const char *, size_t);
 145 };
 146
 147 /**
 148  * struct ioat_sed_ent - wrapper around super extended hardware descriptor
 149  * @hw: hardware SED
 150  * @dma: dma address for the SED
 151  * @parent: point to the dma descriptor that's the parent
 152  * @hw_pool: descriptor pool index
 153  */
 154 struct ioat_sed_ent {
 155         struct ioat_sed_raw_descriptor *hw;
 156         dma_addr_t dma;
 157         struct ioat_ring_ent *parent;
 158         unsigned int hw_pool;
 159 };
 160
 161 /**
 162  * struct ioat_ring_ent - wrapper around hardware descriptor
 163  * @hw: hardware DMA descriptor (for memcpy)
 164  * @xor: hardware xor descriptor
 165  * @xor_ex: hardware xor extension descriptor
 166  * @pq: hardware pq descriptor
 167  * @pq_ex: hardware pq extension descriptor
 168  * @pqu: hardware pq update descriptor
 169  * @raw: hardware raw (un-typed) descriptor
 170  * @txd: the generic software descriptor for all engines
 171  * @len: total transaction length for unmap
 172  * @result: asynchronous result of validate operations
 173  * @id: identifier for debug
 174  * @sed: pointer to super extended descriptor sw desc
 175  */
 176
 177 struct ioat_ring_ent {
 178         union {
 179                 struct ioat_dma_descriptor *hw;
 180                 struct ioat_xor_descriptor *xor;
 181                 struct ioat_xor_ext_descriptor *xor_ex;
 182                 struct ioat_pq_descriptor *pq;
 183                 struct ioat_pq_ext_descriptor *pq_ex;
 184                 struct ioat_pq_update_descriptor *pqu;
 185                 struct ioat_raw_descriptor *raw;
 186         };
 187         size_t len;
 188         struct dma_async_tx_descriptor txd;
 189         enum sum_check_flags *result;
 190         #ifdef DEBUG
 191         int id;
 192         #endif
 193         struct ioat_sed_ent *sed;
 194 };
 195
 196 extern const struct sysfs_ops ioat_sysfs_ops;
 197 extern struct ioat_sysfs_entry ioat_version_attr;
 198 extern struct ioat_sysfs_entry ioat_cap_attr;
 199 extern int ioat_pending_level;
 200 extern struct kobj_type ioat_ktype;
 201 extern struct kmem_cache *ioat_cache;
 202 extern struct kmem_cache *ioat_sed_cache;
 203
 204 static inline struct ioatdma_chan *to_ioat_chan(struct dma_chan *c)
 205 {
 206         return container_of(c, struct ioatdma_chan, dma_chan);
 207 }
 208
 209 /* wrapper around hardware descriptor format + additional software fields */
 210 #ifdef DEBUG
 211 #define set_desc_id(desc, i) ((desc)->id = (i))
 212 #define desc_id(desc) ((desc)->id)
 213 #else
 214 #define set_desc_id(desc, i)
 215 #define desc_id(desc) (0)
 216 #endif
 217
 218 static inline void
 219 __dump_desc_dbg(struct ioatdma_chan *ioat_chan, struct ioat_dma_descriptor *hw,
 220                 struct dma_async_tx_descriptor *tx, int id)
 221 {
 222         struct device *dev = to_dev(ioat_chan);
 223
 224         dev_dbg(dev, "desc[%d]: (%#llx->%#llx) cookie: %d flags: %#x"
 225                 " ctl: %#10.8x (op: %#x int_en: %d compl: %d)\n", id,
 226                 (unsigned long long) tx->phys,
 227                 (unsigned long long) hw->next, tx->cookie, tx->flags,
 228                 hw->ctl, hw->ctl_f.op, hw->ctl_f.int_en, hw->ctl_f.compl_write);
 229 }
 230
 231 #define dump_desc_dbg(c, d) \
 232         ({ if (d) __dump_desc_dbg(c, d->hw, &d->txd, desc_id(d)); 0; })
 233
 234 static inline struct ioatdma_chan *
 235 ioat_chan_by_index(struct ioatdma_device *ioat_dma, int index)
 236 {
 237         return ioat_dma->idx[index];
 238 }
 239
 240 static inline u64 ioat_chansts(struct ioatdma_chan *ioat_chan)
 241 {
 242         return readq(ioat_chan->reg_base + IOAT_CHANSTS_OFFSET);
 243 }
 244
 245 static inline u64 ioat_chansts_to_addr(u64 status)
 246 {
 247         return status & IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR;
 248 }
 249
 250 static inline u32 ioat_chanerr(struct ioatdma_chan *ioat_chan)
 251 {
 252         return readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
 253 }
 254
 255 static inline void ioat_suspend(struct ioatdma_chan *ioat_chan)
 256 {
 257         u8 ver = ioat_chan->ioat_dma->version;
 258
 259         writeb(IOAT_CHANCMD_SUSPEND,
 260                ioat_chan->reg_base + IOAT_CHANCMD_OFFSET(ver));
 261 }
 262
 263 static inline void ioat_reset(struct ioatdma_chan *ioat_chan)
 264 {
 265         u8 ver = ioat_chan->ioat_dma->version;
 266
 267         writeb(IOAT_CHANCMD_RESET,
 268                ioat_chan->reg_base + IOAT_CHANCMD_OFFSET(ver));
 269 }
 270
 271 static inline bool ioat_reset_pending(struct ioatdma_chan *ioat_chan)
 272 {
 273         u8 ver = ioat_chan->ioat_dma->version;
 274         u8 cmd;
 275
 276         cmd = readb(ioat_chan->reg_base + IOAT_CHANCMD_OFFSET(ver));
 277         return (cmd & IOAT_CHANCMD_RESET) == IOAT_CHANCMD_RESET;
 278 }
 279
 280 static inline bool is_ioat_active(unsigned long status)
 281 {
 282         return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_ACTIVE);
 283 }
 284
 285 static inline bool is_ioat_idle(unsigned long status)
 286 {
 287         return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_DONE);
 288 }
 289
 290 static inline bool is_ioat_halted(unsigned long status)
 291 {
 292         return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_HALTED);
 293 }
 294
 295 static inline bool is_ioat_suspended(unsigned long status)
 296 {
 297         return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_SUSPENDED);
 298 }
 299
 300 /* channel was fatally programmed */
 301 static inline bool is_ioat_bug(unsigned long err)
 302 {
 303         return !!err;
 304 }
 305
 306
 307 static inline u32 ioat_ring_size(struct ioatdma_chan *ioat_chan)
 308 {
 309         return 1 << ioat_chan->alloc_order;
 310 }
 311
 312 /* count of descriptors in flight with the engine */
 313 static inline u16 ioat_ring_active(struct ioatdma_chan *ioat_chan)
 314 {
 315         return CIRC_CNT(ioat_chan->head, ioat_chan->tail,
 316                         ioat_ring_size(ioat_chan));
 317 }
 318
 319 /* count of descriptors pending submission to hardware */
 320 static inline u16 ioat_ring_pending(struct ioatdma_chan *ioat_chan)
 321 {
 322         return CIRC_CNT(ioat_chan->head, ioat_chan->issued,
 323                         ioat_ring_size(ioat_chan));
 324 }
 325
 326 static inline u32 ioat_ring_space(struct ioatdma_chan *ioat_chan)
 327 {
 328         return ioat_ring_size(ioat_chan) - ioat_ring_active(ioat_chan);
 329 }
 330
 331 static inline u16
 332 ioat_xferlen_to_descs(struct ioatdma_chan *ioat_chan, size_t len)
 333 {
 334         u16 num_descs = len >> ioat_chan->xfercap_log;
 335
 336         num_descs += !!(len & ((1 << ioat_chan->xfercap_log) - 1));
 337         return num_descs;
 338 }
 339
 340 static inline struct ioat_ring_ent *
 341 ioat_get_ring_ent(struct ioatdma_chan *ioat_chan, u16 idx)
 342 {
 343         return ioat_chan->ring[idx & (ioat_ring_size(ioat_chan) - 1)];
 344 }
 345
 346 static inline void
 347 ioat_set_chainaddr(struct ioatdma_chan *ioat_chan, u64 addr)
 348 {
 349         writel(addr & 0x00000000FFFFFFFF,
 350                ioat_chan->reg_base + IOAT2_CHAINADDR_OFFSET_LOW);
 351         writel(addr >> 32,
 352                ioat_chan->reg_base + IOAT2_CHAINADDR_OFFSET_HIGH);
 353 }
 354
 355 /* IOAT Prep functions */
 356 struct dma_async_tx_descriptor *
 357 ioat_dma_prep_memcpy_lock(struct dma_chan *c, dma_addr_t dma_dest,
 358                            dma_addr_t dma_src, size_t len, unsigned long flags);
 359 struct dma_async_tx_descriptor *
 360 ioat_prep_interrupt_lock(struct dma_chan *c, unsigned long flags);
 361 struct dma_async_tx_descriptor *
 362 ioat_prep_xor(struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src,
 363                unsigned int src_cnt, size_t len, unsigned long flags);
 364 struct dma_async_tx_descriptor *
 365 ioat_prep_xor_val(struct dma_chan *chan, dma_addr_t *src,
 366                     unsigned int src_cnt, size_t len,
 367                     enum sum_check_flags *result, unsigned long flags);
 368 struct dma_async_tx_descriptor *
 369 ioat_prep_pq(struct dma_chan *chan, dma_addr_t *dst, dma_addr_t *src,
 370               unsigned int src_cnt, const unsigned char *scf, size_t len,
 371               unsigned long flags);
 372 struct dma_async_tx_descriptor *
 373 ioat_prep_pq_val(struct dma_chan *chan, dma_addr_t *pq, dma_addr_t *src,
 374                   unsigned int src_cnt, const unsigned char *scf, size_t len,
 375                   enum sum_check_flags *pqres, unsigned long flags);
 376 struct dma_async_tx_descriptor *
 377 ioat_prep_pqxor(struct dma_chan *chan, dma_addr_t dst, dma_addr_t *src,
 378                  unsigned int src_cnt, size_t len, unsigned long flags);
 379 struct dma_async_tx_descriptor *
 380 ioat_prep_pqxor_val(struct dma_chan *chan, dma_addr_t *src,
 381                      unsigned int src_cnt, size_t len,
 382                      enum sum_check_flags *result, unsigned long flags);
 383
 384 /* IOAT Operation functions */
 385 irqreturn_t ioat_dma_do_interrupt(int irq, void *data);
 386 irqreturn_t ioat_dma_do_interrupt_msix(int irq, void *data);
 387 struct ioat_ring_ent **
 388 ioat_alloc_ring(struct dma_chan *c, int order, gfp_t flags);
 389 void ioat_start_null_desc(struct ioatdma_chan *ioat_chan);
 390 void ioat_free_ring_ent(struct ioat_ring_ent *desc, struct dma_chan *chan);
 391 int ioat_reset_hw(struct ioatdma_chan *ioat_chan);
 392 enum dma_status
 393 ioat_tx_status(struct dma_chan *c, dma_cookie_t cookie,
 394                 struct dma_tx_state *txstate);
 395 void ioat_cleanup_event(struct tasklet_struct *t);
 396 void ioat_timer_event(struct timer_list *t);
 397 int ioat_check_space_lock(struct ioatdma_chan *ioat_chan, int num_descs);
 398 void ioat_issue_pending(struct dma_chan *chan);
 399
 400 /* IOAT Init functions */
 401 bool is_bwd_ioat(struct pci_dev *pdev);
 402 struct dca_provider *ioat_dca_init(struct pci_dev *pdev, void __iomem *iobase);
 403 void ioat_kobject_add(struct ioatdma_device *ioat_dma, struct kobj_type *type);
 404 void ioat_kobject_del(struct ioatdma_device *ioat_dma);
 405 int ioat_dma_setup_interrupts(struct ioatdma_device *ioat_dma);
 406 void ioat_stop(struct ioatdma_chan *ioat_chan);
 407 #endif /* IOATDMA_H */