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  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc., 59
  16  * Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called COPYING.
  20  */
  21 #ifndef IOATDMA_H
  22 #define IOATDMA_H
  23
  24 #include <linux/dmaengine.h>
  25 #include "hw.h"
  26 #include "registers.h"
  27 #include <linux/init.h>
  28 #include <linux/dmapool.h>
  29 #include <linux/cache.h>
  30 #include <linux/pci_ids.h>
  31 #include <net/tcp.h>
  32
  33 #define IOAT_DMA_VERSION  "4.00"
  34
  35 #define IOAT_LOW_COMPLETION_MASK        0xffffffc0
  36 #define IOAT_DMA_DCA_ANY_CPU            ~0
  37
  38 #define to_ioatdma_device(dev) container_of(dev, struct ioatdma_device, common)
  39 #define to_ioat_desc(lh) container_of(lh, struct ioat_desc_sw, node)
  40 #define tx_to_ioat_desc(tx) container_of(tx, struct ioat_desc_sw, txd)
  41 #define to_dev(ioat_chan) (&(ioat_chan)->device->pdev->dev)
  42
  43 #define chan_num(ch) ((int)((ch)->reg_base - (ch)->device->reg_base) / 0x80)
  44
  45 /*
  46  * workaround for IOAT ver.3.0 null descriptor issue
  47  * (channel returns error when size is 0)
  48  */
  49 #define NULL_DESC_BUFFER_SIZE 1
  50
  51 /**
  52  * struct ioatdma_device - internal representation of a IOAT device
  53  * @pdev: PCI-Express device
  54  * @reg_base: MMIO register space base address
  55  * @dma_pool: for allocating DMA descriptors
  56  * @common: embedded struct dma_device
  57  * @version: version of ioatdma device
  58  * @msix_entries: irq handlers
  59  * @idx: per channel data
  60  * @dca: direct cache access context
  61  * @intr_quirk: interrupt setup quirk (for ioat_v1 devices)
  62  * @enumerate_channels: hw version specific channel enumeration
  63  * @reset_hw: hw version specific channel (re)initialization
  64  * @cleanup_fn: select between the v2 and v3 cleanup routines
  65  * @timer_fn: select between the v2 and v3 timer watchdog routines
  66  * @self_test: hardware version specific self test for each supported op type
  67  *
  68  * Note: the v3 cleanup routine supports raid operations
  69  */
  70 struct ioatdma_device {
  71         struct pci_dev *pdev;
  72         void __iomem *reg_base;
  73         struct pci_pool *dma_pool;
  74         struct pci_pool *completion_pool;
  75         struct dma_device common;
  76         u8 version;
  77         struct msix_entry msix_entries[4];
  78         struct ioat_chan_common *idx[4];
  79         struct dca_provider *dca;
  80         void (*intr_quirk)(struct ioatdma_device *device);
  81         int (*enumerate_channels)(struct ioatdma_device *device);
  82         int (*reset_hw)(struct ioat_chan_common *chan);
  83         void (*cleanup_fn)(unsigned long data);
  84         void (*timer_fn)(unsigned long data);
  85         int (*self_test)(struct ioatdma_device *device);
  86 };
  87
  88 struct ioat_chan_common {
  89         struct dma_chan common;
  90         void __iomem *reg_base;
  91         unsigned long last_completion;
  92         spinlock_t cleanup_lock;
  93         dma_cookie_t completed_cookie;
  94         unsigned long state;
  95         #define IOAT_COMPLETION_PENDING 0
  96         #define IOAT_COMPLETION_ACK 1
  97         #define IOAT_RESET_PENDING 2
  98         #define IOAT_KOBJ_INIT_FAIL 3
  99         #define IOAT_RESHAPE_PENDING 4
 100         #define IOAT_RUN 5
 101         struct timer_list timer;
 102         #define COMPLETION_TIMEOUT msecs_to_jiffies(100)
 103         #define IDLE_TIMEOUT msecs_to_jiffies(2000)
 104         #define RESET_DELAY msecs_to_jiffies(100)
 105         struct ioatdma_device *device;
 106         dma_addr_t completion_dma;
 107         u64 *completion;
 108         struct tasklet_struct cleanup_task;
 109         struct kobject kobj;
 110 };
 111
 112 struct ioat_sysfs_entry {
 113         struct attribute attr;
 114         ssize_t (*show)(struct dma_chan *, char *);
 115 };
 116
 117 /**
 118  * struct ioat_dma_chan - internal representation of a DMA channel
 119  */
 120 struct ioat_dma_chan {
 121         struct ioat_chan_common base;
 122
 123         size_t xfercap; /* XFERCAP register value expanded out */
 124
 125         spinlock_t desc_lock;
 126         struct list_head free_desc;
 127         struct list_head used_desc;
 128
 129         int pending;
 130         u16 desccount;
 131         u16 active;
 132 };
 133
 134 static inline struct ioat_chan_common *to_chan_common(struct dma_chan *c)
 135 {
 136         return container_of(c, struct ioat_chan_common, common);
 137 }
 138
 139 static inline struct ioat_dma_chan *to_ioat_chan(struct dma_chan *c)
 140 {
 141         struct ioat_chan_common *chan = to_chan_common(c);
 142
 143         return container_of(chan, struct ioat_dma_chan, base);
 144 }
 145
 146 /**
 147  * ioat_tx_status - poll the status of an ioat transaction
 148  * @c: channel handle
 149  * @cookie: transaction identifier
 150  * @txstate: if set, updated with the transaction state
 151  */
 152 static inline enum dma_status
 153 ioat_tx_status(struct dma_chan *c, dma_cookie_t cookie,
 154                  struct dma_tx_state *txstate)
 155 {
 156         struct ioat_chan_common *chan = to_chan_common(c);
 157         dma_cookie_t last_used;
 158         dma_cookie_t last_complete;
 159
 160         last_used = c->cookie;
 161         last_complete = chan->completed_cookie;
 162
 163         dma_set_tx_state(txstate, last_complete, last_used, 0);
 164
 165         return dma_async_is_complete(cookie, last_complete, last_used);
 166 }
 167
 168 /* wrapper around hardware descriptor format + additional software fields */
 169
 170 /**
 171  * struct ioat_desc_sw - wrapper around hardware descriptor
 172  * @hw: hardware DMA descriptor (for memcpy)
 173  * @node: this descriptor will either be on the free list,
 174  *     or attached to a transaction list (tx_list)
 175  * @txd: the generic software descriptor for all engines
 176  * @id: identifier for debug
 177  */
 178 struct ioat_desc_sw {
 179         struct ioat_dma_descriptor *hw;
 180         struct list_head node;
 181         size_t len;
 182         struct list_head tx_list;
 183         struct dma_async_tx_descriptor txd;
 184         #ifdef DEBUG
 185         int id;
 186         #endif
 187 };
 188
 189 #ifdef DEBUG
 190 #define set_desc_id(desc, i) ((desc)->id = (i))
 191 #define desc_id(desc) ((desc)->id)
 192 #else
 193 #define set_desc_id(desc, i)
 194 #define desc_id(desc) (0)
 195 #endif
 196
 197 static inline void
 198 __dump_desc_dbg(struct ioat_chan_common *chan, struct ioat_dma_descriptor *hw,
 199                 struct dma_async_tx_descriptor *tx, int id)
 200 {
 201         struct device *dev = to_dev(chan);
 202
 203         dev_dbg(dev, "desc[%d]: (%#llx->%#llx) cookie: %d flags: %#x"
 204                 " ctl: %#x (op: %d int_en: %d compl: %d)\n", id,
 205                 (unsigned long long) tx->phys,
 206                 (unsigned long long) hw->next, tx->cookie, tx->flags,
 207                 hw->ctl, hw->ctl_f.op, hw->ctl_f.int_en, hw->ctl_f.compl_write);
 208 }
 209
 210 #define dump_desc_dbg(c, d) \
 211         ({ if (d) __dump_desc_dbg(&c->base, d->hw, &d->txd, desc_id(d)); 0; })
 212
 213 static inline void ioat_set_tcp_copy_break(unsigned long copybreak)
 214 {
 215         #ifdef CONFIG_NET_DMA
 216         sysctl_tcp_dma_copybreak = copybreak;
 217         #endif
 218 }
 219
 220 static inline struct ioat_chan_common *
 221 ioat_chan_by_index(struct ioatdma_device *device, int index)
 222 {
 223         return device->idx[index];
 224 }
 225
 226 static inline u64 ioat_chansts(struct ioat_chan_common *chan)
 227 {
 228         u8 ver = chan->device->version;
 229         u64 status;
 230         u32 status_lo;
 231
 232         /* We need to read the low address first as this causes the
 233          * chipset to latch the upper bits for the subsequent read
 234          */
 235         status_lo = readl(chan->reg_base + IOAT_CHANSTS_OFFSET_LOW(ver));
 236         status = readl(chan->reg_base + IOAT_CHANSTS_OFFSET_HIGH(ver));
 237         status <<= 32;
 238         status |= status_lo;
 239
 240         return status;
 241 }
 242
 243 static inline void ioat_start(struct ioat_chan_common *chan)
 244 {
 245         u8 ver = chan->device->version;
 246
 247         writeb(IOAT_CHANCMD_START, chan->reg_base + IOAT_CHANCMD_OFFSET(ver));
 248 }
 249
 250 static inline u64 ioat_chansts_to_addr(u64 status)
 251 {
 252         return status & IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR;
 253 }
 254
 255 static inline u32 ioat_chanerr(struct ioat_chan_common *chan)
 256 {
 257         return readl(chan->reg_base + IOAT_CHANERR_OFFSET);
 258 }
 259
 260 static inline void ioat_suspend(struct ioat_chan_common *chan)
 261 {
 262         u8 ver = chan->device->version;
 263
 264         writeb(IOAT_CHANCMD_SUSPEND, chan->reg_base + IOAT_CHANCMD_OFFSET(ver));
 265 }
 266
 267 static inline void ioat_reset(struct ioat_chan_common *chan)
 268 {
 269         u8 ver = chan->device->version;
 270
 271         writeb(IOAT_CHANCMD_RESET, chan->reg_base + IOAT_CHANCMD_OFFSET(ver));
 272 }
 273
 274 static inline bool ioat_reset_pending(struct ioat_chan_common *chan)
 275 {
 276         u8 ver = chan->device->version;
 277         u8 cmd;
 278
 279         cmd = readb(chan->reg_base + IOAT_CHANCMD_OFFSET(ver));
 280         return (cmd & IOAT_CHANCMD_RESET) == IOAT_CHANCMD_RESET;
 281 }
 282
 283 static inline void ioat_set_chainaddr(struct ioat_dma_chan *ioat, u64 addr)
 284 {
 285         struct ioat_chan_common *chan = &ioat->base;
 286
 287         writel(addr & 0x00000000FFFFFFFF,
 288                chan->reg_base + IOAT1_CHAINADDR_OFFSET_LOW);
 289         writel(addr >> 32,
 290                chan->reg_base + IOAT1_CHAINADDR_OFFSET_HIGH);
 291 }
 292
 293 static inline bool is_ioat_active(unsigned long status)
 294 {
 295         return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_ACTIVE);
 296 }
 297
 298 static inline bool is_ioat_idle(unsigned long status)
 299 {
 300         return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_DONE);
 301 }
 302
 303 static inline bool is_ioat_halted(unsigned long status)
 304 {
 305         return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_HALTED);
 306 }
 307
 308 static inline bool is_ioat_suspended(unsigned long status)
 309 {
 310         return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_SUSPENDED);
 311 }
 312
 313 /* channel was fatally programmed */
 314 static inline bool is_ioat_bug(unsigned long err)
 315 {
 316         return !!err;
 317 }
 318
 319 static inline void ioat_unmap(struct pci_dev *pdev, dma_addr_t addr, size_t len,
 320                               int direction, enum dma_ctrl_flags flags, bool dst)
 321 {
 322         if ((dst && (flags & DMA_COMPL_DEST_UNMAP_SINGLE)) ||
 323             (!dst && (flags & DMA_COMPL_SRC_UNMAP_SINGLE)))
 324                 pci_unmap_single(pdev, addr, len, direction);
 325         else
 326                 pci_unmap_page(pdev, addr, len, direction);
 327 }
 328
 329 int __devinit ioat_probe(struct ioatdma_device *device);
 330 int __devinit ioat_register(struct ioatdma_device *device);
 331 int __devinit ioat1_dma_probe(struct ioatdma_device *dev, int dca);
 332 int __devinit ioat_dma_self_test(struct ioatdma_device *device);
 333 void __devexit ioat_dma_remove(struct ioatdma_device *device);
 334 struct dca_provider * __devinit ioat_dca_init(struct pci_dev *pdev,
 335                                               void __iomem *iobase);
 336 unsigned long ioat_get_current_completion(struct ioat_chan_common *chan);
 337 void ioat_init_channel(struct ioatdma_device *device,
 338                        struct ioat_chan_common *chan, int idx);
 339 enum dma_status ioat_dma_tx_status(struct dma_chan *c, dma_cookie_t cookie,
 340                                    struct dma_tx_state *txstate);
 341 void ioat_dma_unmap(struct ioat_chan_common *chan, enum dma_ctrl_flags flags,
 342                     size_t len, struct ioat_dma_descriptor *hw);
 343 bool ioat_cleanup_preamble(struct ioat_chan_common *chan,
 344                            unsigned long *phys_complete);
 345 void ioat_kobject_add(struct ioatdma_device *device, struct kobj_type *type);
 346 void ioat_kobject_del(struct ioatdma_device *device);
 347 extern const struct sysfs_ops ioat_sysfs_ops;
 348 extern struct ioat_sysfs_entry ioat_version_attr;
 349 extern struct ioat_sysfs_entry ioat_cap_attr;
 350 #endif /* IOATDMA_H */