Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1 | /* |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 2 | * Intel I/OAT DMA Linux driver |
| 3 | * Copyright(c) 2004 - 2007 Intel Corporation. |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify it |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 6 | * under the terms and conditions of the GNU General Public License, |
| 7 | * version 2, as published by the Free Software Foundation. |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 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 |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 15 | * this program; if not, write to the Free Software Foundation, Inc., |
| 16 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 17 | * |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 18 | * The full GNU General Public License is included in this distribution in |
| 19 | * the file called "COPYING". |
| 20 | * |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 21 | */ |
| 22 | |
| 23 | /* |
| 24 | * This driver supports an Intel I/OAT DMA engine, which does asynchronous |
| 25 | * copy operations. |
| 26 | */ |
| 27 | |
| 28 | #include <linux/init.h> |
| 29 | #include <linux/module.h> |
| 30 | #include <linux/pci.h> |
| 31 | #include <linux/interrupt.h> |
| 32 | #include <linux/dmaengine.h> |
| 33 | #include <linux/delay.h> |
David S. Miller | 6b00c92 | 2006-05-23 17:37:58 -0700 | [diff] [blame] | 34 | #include <linux/dma-mapping.h> |
Maciej Sosnowski | 09177e8 | 2008-07-22 10:07:33 -0700 | [diff] [blame^] | 35 | #include <linux/workqueue.h> |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 36 | #include "ioatdma.h" |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 37 | #include "ioatdma_registers.h" |
| 38 | #include "ioatdma_hw.h" |
| 39 | |
| 40 | #define to_ioat_chan(chan) container_of(chan, struct ioat_dma_chan, common) |
Shannon Nelson | 8ab8956 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 41 | #define to_ioatdma_device(dev) container_of(dev, struct ioatdma_device, common) |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 42 | #define to_ioat_desc(lh) container_of(lh, struct ioat_desc_sw, node) |
Dan Williams | 7405f74 | 2007-01-02 11:10:43 -0700 | [diff] [blame] | 43 | #define tx_to_ioat_desc(tx) container_of(tx, struct ioat_desc_sw, async_tx) |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 44 | |
Maciej Sosnowski | 09177e8 | 2008-07-22 10:07:33 -0700 | [diff] [blame^] | 45 | #define chan_num(ch) ((int)((ch)->reg_base - (ch)->device->reg_base) / 0x80) |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 46 | static int ioat_pending_level = 4; |
| 47 | module_param(ioat_pending_level, int, 0644); |
| 48 | MODULE_PARM_DESC(ioat_pending_level, |
| 49 | "high-water mark for pushing ioat descriptors (default: 4)"); |
| 50 | |
Maciej Sosnowski | 09177e8 | 2008-07-22 10:07:33 -0700 | [diff] [blame^] | 51 | #define RESET_DELAY msecs_to_jiffies(100) |
| 52 | #define WATCHDOG_DELAY round_jiffies(msecs_to_jiffies(2000)) |
| 53 | static void ioat_dma_chan_reset_part2(struct work_struct *work); |
| 54 | static void ioat_dma_chan_watchdog(struct work_struct *work); |
| 55 | |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 56 | /* internal functions */ |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 57 | static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat_chan); |
| 58 | static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan); |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 59 | |
Shannon Nelson | 7f2b291 | 2007-10-18 03:07:14 -0700 | [diff] [blame] | 60 | static struct ioat_desc_sw * |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 61 | ioat1_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan); |
| 62 | static struct ioat_desc_sw * |
| 63 | ioat2_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 64 | |
Shannon Nelson | 7f2b291 | 2007-10-18 03:07:14 -0700 | [diff] [blame] | 65 | static inline struct ioat_dma_chan *ioat_lookup_chan_by_index( |
| 66 | struct ioatdma_device *device, |
| 67 | int index) |
Shannon Nelson | 3e03745 | 2007-10-16 01:27:40 -0700 | [diff] [blame] | 68 | { |
| 69 | return device->idx[index]; |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * ioat_dma_do_interrupt - handler used for single vector interrupt mode |
| 74 | * @irq: interrupt id |
| 75 | * @data: interrupt data |
| 76 | */ |
| 77 | static irqreturn_t ioat_dma_do_interrupt(int irq, void *data) |
| 78 | { |
| 79 | struct ioatdma_device *instance = data; |
| 80 | struct ioat_dma_chan *ioat_chan; |
| 81 | unsigned long attnstatus; |
| 82 | int bit; |
| 83 | u8 intrctrl; |
| 84 | |
| 85 | intrctrl = readb(instance->reg_base + IOAT_INTRCTRL_OFFSET); |
| 86 | |
| 87 | if (!(intrctrl & IOAT_INTRCTRL_MASTER_INT_EN)) |
| 88 | return IRQ_NONE; |
| 89 | |
| 90 | if (!(intrctrl & IOAT_INTRCTRL_INT_STATUS)) { |
| 91 | writeb(intrctrl, instance->reg_base + IOAT_INTRCTRL_OFFSET); |
| 92 | return IRQ_NONE; |
| 93 | } |
| 94 | |
| 95 | attnstatus = readl(instance->reg_base + IOAT_ATTNSTATUS_OFFSET); |
| 96 | for_each_bit(bit, &attnstatus, BITS_PER_LONG) { |
| 97 | ioat_chan = ioat_lookup_chan_by_index(instance, bit); |
| 98 | tasklet_schedule(&ioat_chan->cleanup_task); |
| 99 | } |
| 100 | |
| 101 | writeb(intrctrl, instance->reg_base + IOAT_INTRCTRL_OFFSET); |
| 102 | return IRQ_HANDLED; |
| 103 | } |
| 104 | |
| 105 | /** |
| 106 | * ioat_dma_do_interrupt_msix - handler used for vector-per-channel interrupt mode |
| 107 | * @irq: interrupt id |
| 108 | * @data: interrupt data |
| 109 | */ |
| 110 | static irqreturn_t ioat_dma_do_interrupt_msix(int irq, void *data) |
| 111 | { |
| 112 | struct ioat_dma_chan *ioat_chan = data; |
| 113 | |
| 114 | tasklet_schedule(&ioat_chan->cleanup_task); |
| 115 | |
| 116 | return IRQ_HANDLED; |
| 117 | } |
| 118 | |
| 119 | static void ioat_dma_cleanup_tasklet(unsigned long data); |
| 120 | |
| 121 | /** |
| 122 | * ioat_dma_enumerate_channels - find and initialize the device's channels |
| 123 | * @device: the device to be enumerated |
| 124 | */ |
Shannon Nelson | 8ab8956 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 125 | static int ioat_dma_enumerate_channels(struct ioatdma_device *device) |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 126 | { |
| 127 | u8 xfercap_scale; |
| 128 | u32 xfercap; |
| 129 | int i; |
| 130 | struct ioat_dma_chan *ioat_chan; |
| 131 | |
Chris Leech | e382881 | 2007-03-08 09:57:35 -0800 | [diff] [blame] | 132 | device->common.chancnt = readb(device->reg_base + IOAT_CHANCNT_OFFSET); |
| 133 | xfercap_scale = readb(device->reg_base + IOAT_XFERCAP_OFFSET); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 134 | xfercap = (xfercap_scale == 0 ? -1 : (1UL << xfercap_scale)); |
| 135 | |
| 136 | for (i = 0; i < device->common.chancnt; i++) { |
| 137 | ioat_chan = kzalloc(sizeof(*ioat_chan), GFP_KERNEL); |
| 138 | if (!ioat_chan) { |
| 139 | device->common.chancnt = i; |
| 140 | break; |
| 141 | } |
| 142 | |
| 143 | ioat_chan->device = device; |
| 144 | ioat_chan->reg_base = device->reg_base + (0x80 * (i + 1)); |
| 145 | ioat_chan->xfercap = xfercap; |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 146 | ioat_chan->desccount = 0; |
Maciej Sosnowski | 09177e8 | 2008-07-22 10:07:33 -0700 | [diff] [blame^] | 147 | INIT_DELAYED_WORK(&ioat_chan->work, ioat_dma_chan_reset_part2); |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 148 | if (ioat_chan->device->version != IOAT_VER_1_2) { |
| 149 | writel(IOAT_DCACTRL_CMPL_WRITE_ENABLE |
| 150 | | IOAT_DMA_DCA_ANY_CPU, |
| 151 | ioat_chan->reg_base + IOAT_DCACTRL_OFFSET); |
| 152 | } |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 153 | spin_lock_init(&ioat_chan->cleanup_lock); |
| 154 | spin_lock_init(&ioat_chan->desc_lock); |
| 155 | INIT_LIST_HEAD(&ioat_chan->free_desc); |
| 156 | INIT_LIST_HEAD(&ioat_chan->used_desc); |
| 157 | /* This should be made common somewhere in dmaengine.c */ |
| 158 | ioat_chan->common.device = &device->common; |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 159 | list_add_tail(&ioat_chan->common.device_node, |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 160 | &device->common.channels); |
Shannon Nelson | 3e03745 | 2007-10-16 01:27:40 -0700 | [diff] [blame] | 161 | device->idx[i] = ioat_chan; |
| 162 | tasklet_init(&ioat_chan->cleanup_task, |
| 163 | ioat_dma_cleanup_tasklet, |
| 164 | (unsigned long) ioat_chan); |
| 165 | tasklet_disable(&ioat_chan->cleanup_task); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 166 | } |
| 167 | return device->common.chancnt; |
| 168 | } |
| 169 | |
Shannon Nelson | 711924b | 2007-12-17 16:20:08 -0800 | [diff] [blame] | 170 | /** |
| 171 | * ioat_dma_memcpy_issue_pending - push potentially unrecognized appended |
| 172 | * descriptors to hw |
| 173 | * @chan: DMA channel handle |
| 174 | */ |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 175 | static inline void __ioat1_dma_memcpy_issue_pending( |
Shannon Nelson | 711924b | 2007-12-17 16:20:08 -0800 | [diff] [blame] | 176 | struct ioat_dma_chan *ioat_chan) |
| 177 | { |
| 178 | ioat_chan->pending = 0; |
| 179 | writeb(IOAT_CHANCMD_APPEND, ioat_chan->reg_base + IOAT1_CHANCMD_OFFSET); |
| 180 | } |
| 181 | |
| 182 | static void ioat1_dma_memcpy_issue_pending(struct dma_chan *chan) |
| 183 | { |
| 184 | struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); |
| 185 | |
Maciej Sosnowski | 09177e8 | 2008-07-22 10:07:33 -0700 | [diff] [blame^] | 186 | if (ioat_chan->pending > 0) { |
Shannon Nelson | 711924b | 2007-12-17 16:20:08 -0800 | [diff] [blame] | 187 | spin_lock_bh(&ioat_chan->desc_lock); |
| 188 | __ioat1_dma_memcpy_issue_pending(ioat_chan); |
| 189 | spin_unlock_bh(&ioat_chan->desc_lock); |
| 190 | } |
| 191 | } |
| 192 | |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 193 | static inline void __ioat2_dma_memcpy_issue_pending( |
Shannon Nelson | 711924b | 2007-12-17 16:20:08 -0800 | [diff] [blame] | 194 | struct ioat_dma_chan *ioat_chan) |
| 195 | { |
| 196 | ioat_chan->pending = 0; |
| 197 | writew(ioat_chan->dmacount, |
| 198 | ioat_chan->reg_base + IOAT_CHAN_DMACOUNT_OFFSET); |
| 199 | } |
| 200 | |
| 201 | static void ioat2_dma_memcpy_issue_pending(struct dma_chan *chan) |
| 202 | { |
| 203 | struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); |
| 204 | |
Maciej Sosnowski | 09177e8 | 2008-07-22 10:07:33 -0700 | [diff] [blame^] | 205 | if (ioat_chan->pending > 0) { |
Shannon Nelson | 711924b | 2007-12-17 16:20:08 -0800 | [diff] [blame] | 206 | spin_lock_bh(&ioat_chan->desc_lock); |
| 207 | __ioat2_dma_memcpy_issue_pending(ioat_chan); |
| 208 | spin_unlock_bh(&ioat_chan->desc_lock); |
| 209 | } |
| 210 | } |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 211 | |
Maciej Sosnowski | 09177e8 | 2008-07-22 10:07:33 -0700 | [diff] [blame^] | 212 | |
| 213 | /** |
| 214 | * ioat_dma_chan_reset_part2 - reinit the channel after a reset |
| 215 | */ |
| 216 | static void ioat_dma_chan_reset_part2(struct work_struct *work) |
| 217 | { |
| 218 | struct ioat_dma_chan *ioat_chan = |
| 219 | container_of(work, struct ioat_dma_chan, work.work); |
| 220 | struct ioat_desc_sw *desc; |
| 221 | |
| 222 | spin_lock_bh(&ioat_chan->cleanup_lock); |
| 223 | spin_lock_bh(&ioat_chan->desc_lock); |
| 224 | |
| 225 | ioat_chan->completion_virt->low = 0; |
| 226 | ioat_chan->completion_virt->high = 0; |
| 227 | ioat_chan->pending = 0; |
| 228 | |
| 229 | /* |
| 230 | * count the descriptors waiting, and be sure to do it |
| 231 | * right for both the CB1 line and the CB2 ring |
| 232 | */ |
| 233 | ioat_chan->dmacount = 0; |
| 234 | if (ioat_chan->used_desc.prev) { |
| 235 | desc = to_ioat_desc(ioat_chan->used_desc.prev); |
| 236 | do { |
| 237 | ioat_chan->dmacount++; |
| 238 | desc = to_ioat_desc(desc->node.next); |
| 239 | } while (&desc->node != ioat_chan->used_desc.next); |
| 240 | } |
| 241 | |
| 242 | /* |
| 243 | * write the new starting descriptor address |
| 244 | * this puts channel engine into ARMED state |
| 245 | */ |
| 246 | desc = to_ioat_desc(ioat_chan->used_desc.prev); |
| 247 | switch (ioat_chan->device->version) { |
| 248 | case IOAT_VER_1_2: |
| 249 | writel(((u64) desc->async_tx.phys) & 0x00000000FFFFFFFF, |
| 250 | ioat_chan->reg_base + IOAT1_CHAINADDR_OFFSET_LOW); |
| 251 | writel(((u64) desc->async_tx.phys) >> 32, |
| 252 | ioat_chan->reg_base + IOAT1_CHAINADDR_OFFSET_HIGH); |
| 253 | |
| 254 | writeb(IOAT_CHANCMD_START, ioat_chan->reg_base |
| 255 | + IOAT_CHANCMD_OFFSET(ioat_chan->device->version)); |
| 256 | break; |
| 257 | case IOAT_VER_2_0: |
| 258 | writel(((u64) desc->async_tx.phys) & 0x00000000FFFFFFFF, |
| 259 | ioat_chan->reg_base + IOAT2_CHAINADDR_OFFSET_LOW); |
| 260 | writel(((u64) desc->async_tx.phys) >> 32, |
| 261 | ioat_chan->reg_base + IOAT2_CHAINADDR_OFFSET_HIGH); |
| 262 | |
| 263 | /* tell the engine to go with what's left to be done */ |
| 264 | writew(ioat_chan->dmacount, |
| 265 | ioat_chan->reg_base + IOAT_CHAN_DMACOUNT_OFFSET); |
| 266 | |
| 267 | break; |
| 268 | } |
| 269 | dev_err(&ioat_chan->device->pdev->dev, |
| 270 | "chan%d reset - %d descs waiting, %d total desc\n", |
| 271 | chan_num(ioat_chan), ioat_chan->dmacount, ioat_chan->desccount); |
| 272 | |
| 273 | spin_unlock_bh(&ioat_chan->desc_lock); |
| 274 | spin_unlock_bh(&ioat_chan->cleanup_lock); |
| 275 | } |
| 276 | |
| 277 | /** |
| 278 | * ioat_dma_reset_channel - restart a channel |
| 279 | * @ioat_chan: IOAT DMA channel handle |
| 280 | */ |
| 281 | static void ioat_dma_reset_channel(struct ioat_dma_chan *ioat_chan) |
| 282 | { |
| 283 | u32 chansts, chanerr; |
| 284 | |
| 285 | if (!ioat_chan->used_desc.prev) |
| 286 | return; |
| 287 | |
| 288 | chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET); |
| 289 | chansts = (ioat_chan->completion_virt->low |
| 290 | & IOAT_CHANSTS_DMA_TRANSFER_STATUS); |
| 291 | if (chanerr) { |
| 292 | dev_err(&ioat_chan->device->pdev->dev, |
| 293 | "chan%d, CHANSTS = 0x%08x CHANERR = 0x%04x, clearing\n", |
| 294 | chan_num(ioat_chan), chansts, chanerr); |
| 295 | writel(chanerr, ioat_chan->reg_base + IOAT_CHANERR_OFFSET); |
| 296 | } |
| 297 | |
| 298 | /* |
| 299 | * whack it upside the head with a reset |
| 300 | * and wait for things to settle out. |
| 301 | * force the pending count to a really big negative |
| 302 | * to make sure no one forces an issue_pending |
| 303 | * while we're waiting. |
| 304 | */ |
| 305 | |
| 306 | spin_lock_bh(&ioat_chan->desc_lock); |
| 307 | ioat_chan->pending = INT_MIN; |
| 308 | writeb(IOAT_CHANCMD_RESET, |
| 309 | ioat_chan->reg_base |
| 310 | + IOAT_CHANCMD_OFFSET(ioat_chan->device->version)); |
| 311 | spin_unlock_bh(&ioat_chan->desc_lock); |
| 312 | |
| 313 | /* schedule the 2nd half instead of sleeping a long time */ |
| 314 | schedule_delayed_work(&ioat_chan->work, RESET_DELAY); |
| 315 | } |
| 316 | |
| 317 | /** |
| 318 | * ioat_dma_chan_watchdog - watch for stuck channels |
| 319 | */ |
| 320 | static void ioat_dma_chan_watchdog(struct work_struct *work) |
| 321 | { |
| 322 | struct ioatdma_device *device = |
| 323 | container_of(work, struct ioatdma_device, work.work); |
| 324 | struct ioat_dma_chan *ioat_chan; |
| 325 | int i; |
| 326 | |
| 327 | union { |
| 328 | u64 full; |
| 329 | struct { |
| 330 | u32 low; |
| 331 | u32 high; |
| 332 | }; |
| 333 | } completion_hw; |
| 334 | unsigned long compl_desc_addr_hw; |
| 335 | |
| 336 | for (i = 0; i < device->common.chancnt; i++) { |
| 337 | ioat_chan = ioat_lookup_chan_by_index(device, i); |
| 338 | |
| 339 | if (ioat_chan->device->version == IOAT_VER_1_2 |
| 340 | /* have we started processing anything yet */ |
| 341 | && ioat_chan->last_completion |
| 342 | /* have we completed any since last watchdog cycle? */ |
| 343 | && (ioat_chan->last_completion == |
| 344 | ioat_chan->watchdog_completion) |
| 345 | /* has TCP stuck on one cookie since last watchdog? */ |
| 346 | && (ioat_chan->watchdog_tcp_cookie == |
| 347 | ioat_chan->watchdog_last_tcp_cookie) |
| 348 | && (ioat_chan->watchdog_tcp_cookie != |
| 349 | ioat_chan->completed_cookie) |
| 350 | /* is there something in the chain to be processed? */ |
| 351 | /* CB1 chain always has at least the last one processed */ |
| 352 | && (ioat_chan->used_desc.prev != ioat_chan->used_desc.next) |
| 353 | && ioat_chan->pending == 0) { |
| 354 | |
| 355 | /* |
| 356 | * check CHANSTS register for completed |
| 357 | * descriptor address. |
| 358 | * if it is different than completion writeback, |
| 359 | * it is not zero |
| 360 | * and it has changed since the last watchdog |
| 361 | * we can assume that channel |
| 362 | * is still working correctly |
| 363 | * and the problem is in completion writeback. |
| 364 | * update completion writeback |
| 365 | * with actual CHANSTS value |
| 366 | * else |
| 367 | * try resetting the channel |
| 368 | */ |
| 369 | |
| 370 | completion_hw.low = readl(ioat_chan->reg_base + |
| 371 | IOAT_CHANSTS_OFFSET_LOW(ioat_chan->device->version)); |
| 372 | completion_hw.high = readl(ioat_chan->reg_base + |
| 373 | IOAT_CHANSTS_OFFSET_HIGH(ioat_chan->device->version)); |
| 374 | #if (BITS_PER_LONG == 64) |
| 375 | compl_desc_addr_hw = |
| 376 | completion_hw.full |
| 377 | & IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR; |
| 378 | #else |
| 379 | compl_desc_addr_hw = |
| 380 | completion_hw.low & IOAT_LOW_COMPLETION_MASK; |
| 381 | #endif |
| 382 | |
| 383 | if ((compl_desc_addr_hw != 0) |
| 384 | && (compl_desc_addr_hw != ioat_chan->watchdog_completion) |
| 385 | && (compl_desc_addr_hw != ioat_chan->last_compl_desc_addr_hw)) { |
| 386 | ioat_chan->last_compl_desc_addr_hw = compl_desc_addr_hw; |
| 387 | ioat_chan->completion_virt->low = completion_hw.low; |
| 388 | ioat_chan->completion_virt->high = completion_hw.high; |
| 389 | } else { |
| 390 | ioat_dma_reset_channel(ioat_chan); |
| 391 | ioat_chan->watchdog_completion = 0; |
| 392 | ioat_chan->last_compl_desc_addr_hw = 0; |
| 393 | } |
| 394 | |
| 395 | /* |
| 396 | * for version 2.0 if there are descriptors yet to be processed |
| 397 | * and the last completed hasn't changed since the last watchdog |
| 398 | * if they haven't hit the pending level |
| 399 | * issue the pending to push them through |
| 400 | * else |
| 401 | * try resetting the channel |
| 402 | */ |
| 403 | } else if (ioat_chan->device->version == IOAT_VER_2_0 |
| 404 | && ioat_chan->used_desc.prev |
| 405 | && ioat_chan->last_completion |
| 406 | && ioat_chan->last_completion == ioat_chan->watchdog_completion) { |
| 407 | |
| 408 | if (ioat_chan->pending < ioat_pending_level) |
| 409 | ioat2_dma_memcpy_issue_pending(&ioat_chan->common); |
| 410 | else { |
| 411 | ioat_dma_reset_channel(ioat_chan); |
| 412 | ioat_chan->watchdog_completion = 0; |
| 413 | } |
| 414 | } else { |
| 415 | ioat_chan->last_compl_desc_addr_hw = 0; |
| 416 | ioat_chan->watchdog_completion |
| 417 | = ioat_chan->last_completion; |
| 418 | } |
| 419 | |
| 420 | ioat_chan->watchdog_last_tcp_cookie = |
| 421 | ioat_chan->watchdog_tcp_cookie; |
| 422 | } |
| 423 | |
| 424 | schedule_delayed_work(&device->work, WATCHDOG_DELAY); |
| 425 | } |
| 426 | |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 427 | static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx) |
Dan Williams | 7405f74 | 2007-01-02 11:10:43 -0700 | [diff] [blame] | 428 | { |
| 429 | struct ioat_dma_chan *ioat_chan = to_ioat_chan(tx->chan); |
Shannon Nelson | 7f2b291 | 2007-10-18 03:07:14 -0700 | [diff] [blame] | 430 | struct ioat_desc_sw *first = tx_to_ioat_desc(tx); |
| 431 | struct ioat_desc_sw *prev, *new; |
| 432 | struct ioat_dma_descriptor *hw; |
Dan Williams | 7405f74 | 2007-01-02 11:10:43 -0700 | [diff] [blame] | 433 | dma_cookie_t cookie; |
Shannon Nelson | 7f2b291 | 2007-10-18 03:07:14 -0700 | [diff] [blame] | 434 | LIST_HEAD(new_chain); |
| 435 | u32 copy; |
| 436 | size_t len; |
| 437 | dma_addr_t src, dst; |
Dan Williams | 636bdea | 2008-04-17 20:17:26 -0700 | [diff] [blame] | 438 | unsigned long orig_flags; |
Shannon Nelson | 7f2b291 | 2007-10-18 03:07:14 -0700 | [diff] [blame] | 439 | unsigned int desc_count = 0; |
Dan Williams | 7405f74 | 2007-01-02 11:10:43 -0700 | [diff] [blame] | 440 | |
Shannon Nelson | 7f2b291 | 2007-10-18 03:07:14 -0700 | [diff] [blame] | 441 | /* src and dest and len are stored in the initial descriptor */ |
| 442 | len = first->len; |
| 443 | src = first->src; |
| 444 | dst = first->dst; |
Dan Williams | 636bdea | 2008-04-17 20:17:26 -0700 | [diff] [blame] | 445 | orig_flags = first->async_tx.flags; |
Shannon Nelson | 7f2b291 | 2007-10-18 03:07:14 -0700 | [diff] [blame] | 446 | new = first; |
| 447 | |
Dan Williams | 7405f74 | 2007-01-02 11:10:43 -0700 | [diff] [blame] | 448 | spin_lock_bh(&ioat_chan->desc_lock); |
Shannon Nelson | 7f2b291 | 2007-10-18 03:07:14 -0700 | [diff] [blame] | 449 | prev = to_ioat_desc(ioat_chan->used_desc.prev); |
| 450 | prefetch(prev->hw); |
| 451 | do { |
Shannon Nelson | 711924b | 2007-12-17 16:20:08 -0800 | [diff] [blame] | 452 | copy = min_t(size_t, len, ioat_chan->xfercap); |
Shannon Nelson | 7f2b291 | 2007-10-18 03:07:14 -0700 | [diff] [blame] | 453 | |
Dan Williams | 636bdea | 2008-04-17 20:17:26 -0700 | [diff] [blame] | 454 | async_tx_ack(&new->async_tx); |
Shannon Nelson | 7f2b291 | 2007-10-18 03:07:14 -0700 | [diff] [blame] | 455 | |
| 456 | hw = new->hw; |
| 457 | hw->size = copy; |
| 458 | hw->ctl = 0; |
| 459 | hw->src_addr = src; |
| 460 | hw->dst_addr = dst; |
| 461 | hw->next = 0; |
| 462 | |
| 463 | /* chain together the physical address list for the HW */ |
| 464 | wmb(); |
| 465 | prev->hw->next = (u64) new->async_tx.phys; |
| 466 | |
| 467 | len -= copy; |
| 468 | dst += copy; |
| 469 | src += copy; |
| 470 | |
| 471 | list_add_tail(&new->node, &new_chain); |
| 472 | desc_count++; |
| 473 | prev = new; |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 474 | } while (len && (new = ioat1_dma_get_next_descriptor(ioat_chan))); |
Shannon Nelson | 7f2b291 | 2007-10-18 03:07:14 -0700 | [diff] [blame] | 475 | |
| 476 | hw->ctl = IOAT_DMA_DESCRIPTOR_CTL_CP_STS; |
Shannon Nelson | 9521843 | 2007-10-18 03:07:15 -0700 | [diff] [blame] | 477 | if (new->async_tx.callback) { |
| 478 | hw->ctl |= IOAT_DMA_DESCRIPTOR_CTL_INT_GN; |
| 479 | if (first != new) { |
| 480 | /* move callback into to last desc */ |
| 481 | new->async_tx.callback = first->async_tx.callback; |
| 482 | new->async_tx.callback_param |
| 483 | = first->async_tx.callback_param; |
| 484 | first->async_tx.callback = NULL; |
| 485 | first->async_tx.callback_param = NULL; |
| 486 | } |
| 487 | } |
| 488 | |
Shannon Nelson | 7f2b291 | 2007-10-18 03:07:14 -0700 | [diff] [blame] | 489 | new->tx_cnt = desc_count; |
Dan Williams | 636bdea | 2008-04-17 20:17:26 -0700 | [diff] [blame] | 490 | new->async_tx.flags = orig_flags; /* client is in control of this ack */ |
Shannon Nelson | 7f2b291 | 2007-10-18 03:07:14 -0700 | [diff] [blame] | 491 | |
| 492 | /* store the original values for use in later cleanup */ |
| 493 | if (new != first) { |
| 494 | new->src = first->src; |
| 495 | new->dst = first->dst; |
| 496 | new->len = first->len; |
| 497 | } |
| 498 | |
Dan Williams | 7405f74 | 2007-01-02 11:10:43 -0700 | [diff] [blame] | 499 | /* cookie incr and addition to used_list must be atomic */ |
| 500 | cookie = ioat_chan->common.cookie; |
| 501 | cookie++; |
| 502 | if (cookie < 0) |
| 503 | cookie = 1; |
Shannon Nelson | 7f2b291 | 2007-10-18 03:07:14 -0700 | [diff] [blame] | 504 | ioat_chan->common.cookie = new->async_tx.cookie = cookie; |
Dan Williams | 7405f74 | 2007-01-02 11:10:43 -0700 | [diff] [blame] | 505 | |
| 506 | /* write address into NextDescriptor field of last desc in chain */ |
| 507 | to_ioat_desc(ioat_chan->used_desc.prev)->hw->next = |
Shannon Nelson | 7f2b291 | 2007-10-18 03:07:14 -0700 | [diff] [blame] | 508 | first->async_tx.phys; |
| 509 | __list_splice(&new_chain, ioat_chan->used_desc.prev); |
Dan Williams | 7405f74 | 2007-01-02 11:10:43 -0700 | [diff] [blame] | 510 | |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 511 | ioat_chan->dmacount += desc_count; |
Shannon Nelson | 7f2b291 | 2007-10-18 03:07:14 -0700 | [diff] [blame] | 512 | ioat_chan->pending += desc_count; |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 513 | if (ioat_chan->pending >= ioat_pending_level) |
| 514 | __ioat1_dma_memcpy_issue_pending(ioat_chan); |
Dan Williams | 7405f74 | 2007-01-02 11:10:43 -0700 | [diff] [blame] | 515 | spin_unlock_bh(&ioat_chan->desc_lock); |
| 516 | |
Dan Williams | 7405f74 | 2007-01-02 11:10:43 -0700 | [diff] [blame] | 517 | return cookie; |
| 518 | } |
| 519 | |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 520 | static dma_cookie_t ioat2_tx_submit(struct dma_async_tx_descriptor *tx) |
| 521 | { |
| 522 | struct ioat_dma_chan *ioat_chan = to_ioat_chan(tx->chan); |
| 523 | struct ioat_desc_sw *first = tx_to_ioat_desc(tx); |
| 524 | struct ioat_desc_sw *new; |
| 525 | struct ioat_dma_descriptor *hw; |
| 526 | dma_cookie_t cookie; |
| 527 | u32 copy; |
| 528 | size_t len; |
| 529 | dma_addr_t src, dst; |
Dan Williams | 636bdea | 2008-04-17 20:17:26 -0700 | [diff] [blame] | 530 | unsigned long orig_flags; |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 531 | unsigned int desc_count = 0; |
| 532 | |
| 533 | /* src and dest and len are stored in the initial descriptor */ |
| 534 | len = first->len; |
| 535 | src = first->src; |
| 536 | dst = first->dst; |
Dan Williams | 636bdea | 2008-04-17 20:17:26 -0700 | [diff] [blame] | 537 | orig_flags = first->async_tx.flags; |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 538 | new = first; |
| 539 | |
Shannon Nelson | 711924b | 2007-12-17 16:20:08 -0800 | [diff] [blame] | 540 | /* |
| 541 | * ioat_chan->desc_lock is still in force in version 2 path |
| 542 | * it gets unlocked at end of this function |
| 543 | */ |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 544 | do { |
Shannon Nelson | 711924b | 2007-12-17 16:20:08 -0800 | [diff] [blame] | 545 | copy = min_t(size_t, len, ioat_chan->xfercap); |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 546 | |
Dan Williams | 636bdea | 2008-04-17 20:17:26 -0700 | [diff] [blame] | 547 | async_tx_ack(&new->async_tx); |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 548 | |
| 549 | hw = new->hw; |
| 550 | hw->size = copy; |
| 551 | hw->ctl = 0; |
| 552 | hw->src_addr = src; |
| 553 | hw->dst_addr = dst; |
| 554 | |
| 555 | len -= copy; |
| 556 | dst += copy; |
| 557 | src += copy; |
| 558 | desc_count++; |
| 559 | } while (len && (new = ioat2_dma_get_next_descriptor(ioat_chan))); |
| 560 | |
| 561 | hw->ctl = IOAT_DMA_DESCRIPTOR_CTL_CP_STS; |
| 562 | if (new->async_tx.callback) { |
| 563 | hw->ctl |= IOAT_DMA_DESCRIPTOR_CTL_INT_GN; |
| 564 | if (first != new) { |
| 565 | /* move callback into to last desc */ |
| 566 | new->async_tx.callback = first->async_tx.callback; |
| 567 | new->async_tx.callback_param |
| 568 | = first->async_tx.callback_param; |
| 569 | first->async_tx.callback = NULL; |
| 570 | first->async_tx.callback_param = NULL; |
| 571 | } |
| 572 | } |
| 573 | |
| 574 | new->tx_cnt = desc_count; |
Dan Williams | 636bdea | 2008-04-17 20:17:26 -0700 | [diff] [blame] | 575 | new->async_tx.flags = orig_flags; /* client is in control of this ack */ |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 576 | |
| 577 | /* store the original values for use in later cleanup */ |
| 578 | if (new != first) { |
| 579 | new->src = first->src; |
| 580 | new->dst = first->dst; |
| 581 | new->len = first->len; |
| 582 | } |
| 583 | |
| 584 | /* cookie incr and addition to used_list must be atomic */ |
| 585 | cookie = ioat_chan->common.cookie; |
| 586 | cookie++; |
| 587 | if (cookie < 0) |
| 588 | cookie = 1; |
| 589 | ioat_chan->common.cookie = new->async_tx.cookie = cookie; |
| 590 | |
| 591 | ioat_chan->dmacount += desc_count; |
| 592 | ioat_chan->pending += desc_count; |
| 593 | if (ioat_chan->pending >= ioat_pending_level) |
| 594 | __ioat2_dma_memcpy_issue_pending(ioat_chan); |
| 595 | spin_unlock_bh(&ioat_chan->desc_lock); |
| 596 | |
| 597 | return cookie; |
| 598 | } |
| 599 | |
| 600 | /** |
| 601 | * ioat_dma_alloc_descriptor - allocate and return a sw and hw descriptor pair |
| 602 | * @ioat_chan: the channel supplying the memory pool for the descriptors |
| 603 | * @flags: allocation flags |
| 604 | */ |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 605 | static struct ioat_desc_sw *ioat_dma_alloc_descriptor( |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 606 | struct ioat_dma_chan *ioat_chan, |
| 607 | gfp_t flags) |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 608 | { |
| 609 | struct ioat_dma_descriptor *desc; |
| 610 | struct ioat_desc_sw *desc_sw; |
Shannon Nelson | 8ab8956 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 611 | struct ioatdma_device *ioatdma_device; |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 612 | dma_addr_t phys; |
| 613 | |
Shannon Nelson | 8ab8956 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 614 | ioatdma_device = to_ioatdma_device(ioat_chan->common.device); |
| 615 | desc = pci_pool_alloc(ioatdma_device->dma_pool, flags, &phys); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 616 | if (unlikely(!desc)) |
| 617 | return NULL; |
| 618 | |
| 619 | desc_sw = kzalloc(sizeof(*desc_sw), flags); |
| 620 | if (unlikely(!desc_sw)) { |
Shannon Nelson | 8ab8956 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 621 | pci_pool_free(ioatdma_device->dma_pool, desc, phys); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 622 | return NULL; |
| 623 | } |
| 624 | |
| 625 | memset(desc, 0, sizeof(*desc)); |
Dan Williams | 7405f74 | 2007-01-02 11:10:43 -0700 | [diff] [blame] | 626 | dma_async_tx_descriptor_init(&desc_sw->async_tx, &ioat_chan->common); |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 627 | switch (ioat_chan->device->version) { |
| 628 | case IOAT_VER_1_2: |
| 629 | desc_sw->async_tx.tx_submit = ioat1_tx_submit; |
| 630 | break; |
| 631 | case IOAT_VER_2_0: |
| 632 | desc_sw->async_tx.tx_submit = ioat2_tx_submit; |
| 633 | break; |
| 634 | } |
Dan Williams | 7405f74 | 2007-01-02 11:10:43 -0700 | [diff] [blame] | 635 | INIT_LIST_HEAD(&desc_sw->async_tx.tx_list); |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 636 | |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 637 | desc_sw->hw = desc; |
Dan Williams | 7405f74 | 2007-01-02 11:10:43 -0700 | [diff] [blame] | 638 | desc_sw->async_tx.phys = phys; |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 639 | |
| 640 | return desc_sw; |
| 641 | } |
| 642 | |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 643 | static int ioat_initial_desc_count = 256; |
| 644 | module_param(ioat_initial_desc_count, int, 0644); |
| 645 | MODULE_PARM_DESC(ioat_initial_desc_count, |
| 646 | "initial descriptors per channel (default: 256)"); |
| 647 | |
| 648 | /** |
| 649 | * ioat2_dma_massage_chan_desc - link the descriptors into a circle |
| 650 | * @ioat_chan: the channel to be massaged |
| 651 | */ |
| 652 | static void ioat2_dma_massage_chan_desc(struct ioat_dma_chan *ioat_chan) |
| 653 | { |
| 654 | struct ioat_desc_sw *desc, *_desc; |
| 655 | |
| 656 | /* setup used_desc */ |
| 657 | ioat_chan->used_desc.next = ioat_chan->free_desc.next; |
| 658 | ioat_chan->used_desc.prev = NULL; |
| 659 | |
| 660 | /* pull free_desc out of the circle so that every node is a hw |
| 661 | * descriptor, but leave it pointing to the list |
| 662 | */ |
| 663 | ioat_chan->free_desc.prev->next = ioat_chan->free_desc.next; |
| 664 | ioat_chan->free_desc.next->prev = ioat_chan->free_desc.prev; |
| 665 | |
| 666 | /* circle link the hw descriptors */ |
| 667 | desc = to_ioat_desc(ioat_chan->free_desc.next); |
| 668 | desc->hw->next = to_ioat_desc(desc->node.next)->async_tx.phys; |
| 669 | list_for_each_entry_safe(desc, _desc, ioat_chan->free_desc.next, node) { |
| 670 | desc->hw->next = to_ioat_desc(desc->node.next)->async_tx.phys; |
| 671 | } |
| 672 | } |
| 673 | |
| 674 | /** |
| 675 | * ioat_dma_alloc_chan_resources - returns the number of allocated descriptors |
| 676 | * @chan: the channel to be filled out |
| 677 | */ |
Haavard Skinnemoen | 848c536 | 2008-07-08 11:58:58 -0700 | [diff] [blame] | 678 | static int ioat_dma_alloc_chan_resources(struct dma_chan *chan, |
| 679 | struct dma_client *client) |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 680 | { |
| 681 | struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); |
Shannon Nelson | 711924b | 2007-12-17 16:20:08 -0800 | [diff] [blame] | 682 | struct ioat_desc_sw *desc; |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 683 | u16 chanctrl; |
| 684 | u32 chanerr; |
| 685 | int i; |
| 686 | LIST_HEAD(tmp_list); |
| 687 | |
Shannon Nelson | e422397 | 2007-08-24 23:02:53 -0700 | [diff] [blame] | 688 | /* have we already been set up? */ |
| 689 | if (!list_empty(&ioat_chan->free_desc)) |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 690 | return ioat_chan->desccount; |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 691 | |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 692 | /* Setup register to interrupt and write completion status on error */ |
Shannon Nelson | e422397 | 2007-08-24 23:02:53 -0700 | [diff] [blame] | 693 | chanctrl = IOAT_CHANCTRL_ERR_INT_EN | |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 694 | IOAT_CHANCTRL_ANY_ERR_ABORT_EN | |
| 695 | IOAT_CHANCTRL_ERR_COMPLETION_EN; |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 696 | writew(chanctrl, ioat_chan->reg_base + IOAT_CHANCTRL_OFFSET); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 697 | |
Chris Leech | e382881 | 2007-03-08 09:57:35 -0800 | [diff] [blame] | 698 | chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 699 | if (chanerr) { |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 700 | dev_err(&ioat_chan->device->pdev->dev, |
Shannon Nelson | 5149fd0 | 2007-10-18 03:07:13 -0700 | [diff] [blame] | 701 | "CHANERR = %x, clearing\n", chanerr); |
Chris Leech | e382881 | 2007-03-08 09:57:35 -0800 | [diff] [blame] | 702 | writel(chanerr, ioat_chan->reg_base + IOAT_CHANERR_OFFSET); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 703 | } |
| 704 | |
| 705 | /* Allocate descriptors */ |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 706 | for (i = 0; i < ioat_initial_desc_count; i++) { |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 707 | desc = ioat_dma_alloc_descriptor(ioat_chan, GFP_KERNEL); |
| 708 | if (!desc) { |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 709 | dev_err(&ioat_chan->device->pdev->dev, |
Shannon Nelson | 5149fd0 | 2007-10-18 03:07:13 -0700 | [diff] [blame] | 710 | "Only %d initial descriptors\n", i); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 711 | break; |
| 712 | } |
| 713 | list_add_tail(&desc->node, &tmp_list); |
| 714 | } |
| 715 | spin_lock_bh(&ioat_chan->desc_lock); |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 716 | ioat_chan->desccount = i; |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 717 | list_splice(&tmp_list, &ioat_chan->free_desc); |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 718 | if (ioat_chan->device->version != IOAT_VER_1_2) |
| 719 | ioat2_dma_massage_chan_desc(ioat_chan); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 720 | spin_unlock_bh(&ioat_chan->desc_lock); |
| 721 | |
| 722 | /* allocate a completion writeback area */ |
| 723 | /* doing 2 32bit writes to mmio since 1 64b write doesn't work */ |
| 724 | ioat_chan->completion_virt = |
| 725 | pci_pool_alloc(ioat_chan->device->completion_pool, |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 726 | GFP_KERNEL, |
| 727 | &ioat_chan->completion_addr); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 728 | memset(ioat_chan->completion_virt, 0, |
| 729 | sizeof(*ioat_chan->completion_virt)); |
Chris Leech | e382881 | 2007-03-08 09:57:35 -0800 | [diff] [blame] | 730 | writel(((u64) ioat_chan->completion_addr) & 0x00000000FFFFFFFF, |
| 731 | ioat_chan->reg_base + IOAT_CHANCMP_OFFSET_LOW); |
| 732 | writel(((u64) ioat_chan->completion_addr) >> 32, |
| 733 | ioat_chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 734 | |
Shannon Nelson | 3e03745 | 2007-10-16 01:27:40 -0700 | [diff] [blame] | 735 | tasklet_enable(&ioat_chan->cleanup_task); |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 736 | ioat_dma_start_null_desc(ioat_chan); /* give chain to dma device */ |
| 737 | return ioat_chan->desccount; |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 738 | } |
| 739 | |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 740 | /** |
| 741 | * ioat_dma_free_chan_resources - release all the descriptors |
| 742 | * @chan: the channel to be cleaned |
| 743 | */ |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 744 | static void ioat_dma_free_chan_resources(struct dma_chan *chan) |
| 745 | { |
| 746 | struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); |
Shannon Nelson | 8ab8956 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 747 | struct ioatdma_device *ioatdma_device = to_ioatdma_device(chan->device); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 748 | struct ioat_desc_sw *desc, *_desc; |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 749 | int in_use_descs = 0; |
| 750 | |
Shannon Nelson | 3e03745 | 2007-10-16 01:27:40 -0700 | [diff] [blame] | 751 | tasklet_disable(&ioat_chan->cleanup_task); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 752 | ioat_dma_memcpy_cleanup(ioat_chan); |
| 753 | |
Shannon Nelson | 3e03745 | 2007-10-16 01:27:40 -0700 | [diff] [blame] | 754 | /* Delay 100ms after reset to allow internal DMA logic to quiesce |
| 755 | * before removing DMA descriptor resources. |
| 756 | */ |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 757 | writeb(IOAT_CHANCMD_RESET, |
| 758 | ioat_chan->reg_base |
| 759 | + IOAT_CHANCMD_OFFSET(ioat_chan->device->version)); |
Shannon Nelson | 3e03745 | 2007-10-16 01:27:40 -0700 | [diff] [blame] | 760 | mdelay(100); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 761 | |
| 762 | spin_lock_bh(&ioat_chan->desc_lock); |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 763 | switch (ioat_chan->device->version) { |
| 764 | case IOAT_VER_1_2: |
| 765 | list_for_each_entry_safe(desc, _desc, |
| 766 | &ioat_chan->used_desc, node) { |
| 767 | in_use_descs++; |
| 768 | list_del(&desc->node); |
| 769 | pci_pool_free(ioatdma_device->dma_pool, desc->hw, |
| 770 | desc->async_tx.phys); |
| 771 | kfree(desc); |
| 772 | } |
| 773 | list_for_each_entry_safe(desc, _desc, |
| 774 | &ioat_chan->free_desc, node) { |
| 775 | list_del(&desc->node); |
| 776 | pci_pool_free(ioatdma_device->dma_pool, desc->hw, |
| 777 | desc->async_tx.phys); |
| 778 | kfree(desc); |
| 779 | } |
| 780 | break; |
| 781 | case IOAT_VER_2_0: |
| 782 | list_for_each_entry_safe(desc, _desc, |
| 783 | ioat_chan->free_desc.next, node) { |
| 784 | list_del(&desc->node); |
| 785 | pci_pool_free(ioatdma_device->dma_pool, desc->hw, |
| 786 | desc->async_tx.phys); |
| 787 | kfree(desc); |
| 788 | } |
| 789 | desc = to_ioat_desc(ioat_chan->free_desc.next); |
Shannon Nelson | 8ab8956 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 790 | pci_pool_free(ioatdma_device->dma_pool, desc->hw, |
Dan Williams | 7405f74 | 2007-01-02 11:10:43 -0700 | [diff] [blame] | 791 | desc->async_tx.phys); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 792 | kfree(desc); |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 793 | INIT_LIST_HEAD(&ioat_chan->free_desc); |
| 794 | INIT_LIST_HEAD(&ioat_chan->used_desc); |
| 795 | break; |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 796 | } |
| 797 | spin_unlock_bh(&ioat_chan->desc_lock); |
| 798 | |
Shannon Nelson | 8ab8956 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 799 | pci_pool_free(ioatdma_device->completion_pool, |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 800 | ioat_chan->completion_virt, |
| 801 | ioat_chan->completion_addr); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 802 | |
| 803 | /* one is ok since we left it on there on purpose */ |
| 804 | if (in_use_descs > 1) |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 805 | dev_err(&ioat_chan->device->pdev->dev, |
Shannon Nelson | 5149fd0 | 2007-10-18 03:07:13 -0700 | [diff] [blame] | 806 | "Freeing %d in use descriptors!\n", |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 807 | in_use_descs - 1); |
| 808 | |
| 809 | ioat_chan->last_completion = ioat_chan->completion_addr = 0; |
Shannon Nelson | 3e03745 | 2007-10-16 01:27:40 -0700 | [diff] [blame] | 810 | ioat_chan->pending = 0; |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 811 | ioat_chan->dmacount = 0; |
Maciej Sosnowski | 09177e8 | 2008-07-22 10:07:33 -0700 | [diff] [blame^] | 812 | ioat_chan->watchdog_completion = 0; |
| 813 | ioat_chan->last_compl_desc_addr_hw = 0; |
| 814 | ioat_chan->watchdog_tcp_cookie = |
| 815 | ioat_chan->watchdog_last_tcp_cookie = 0; |
Shannon Nelson | 3e03745 | 2007-10-16 01:27:40 -0700 | [diff] [blame] | 816 | } |
Shannon Nelson | 7f2b291 | 2007-10-18 03:07:14 -0700 | [diff] [blame] | 817 | |
Shannon Nelson | 3e03745 | 2007-10-16 01:27:40 -0700 | [diff] [blame] | 818 | /** |
| 819 | * ioat_dma_get_next_descriptor - return the next available descriptor |
| 820 | * @ioat_chan: IOAT DMA channel handle |
| 821 | * |
| 822 | * Gets the next descriptor from the chain, and must be called with the |
| 823 | * channel's desc_lock held. Allocates more descriptors if the channel |
| 824 | * has run out. |
| 825 | */ |
Shannon Nelson | 7f2b291 | 2007-10-18 03:07:14 -0700 | [diff] [blame] | 826 | static struct ioat_desc_sw * |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 827 | ioat1_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan) |
Shannon Nelson | 3e03745 | 2007-10-16 01:27:40 -0700 | [diff] [blame] | 828 | { |
Shannon Nelson | 711924b | 2007-12-17 16:20:08 -0800 | [diff] [blame] | 829 | struct ioat_desc_sw *new; |
Shannon Nelson | 3e03745 | 2007-10-16 01:27:40 -0700 | [diff] [blame] | 830 | |
| 831 | if (!list_empty(&ioat_chan->free_desc)) { |
| 832 | new = to_ioat_desc(ioat_chan->free_desc.next); |
| 833 | list_del(&new->node); |
| 834 | } else { |
| 835 | /* try to get another desc */ |
| 836 | new = ioat_dma_alloc_descriptor(ioat_chan, GFP_ATOMIC); |
Shannon Nelson | 711924b | 2007-12-17 16:20:08 -0800 | [diff] [blame] | 837 | if (!new) { |
| 838 | dev_err(&ioat_chan->device->pdev->dev, |
| 839 | "alloc failed\n"); |
| 840 | return NULL; |
| 841 | } |
Shannon Nelson | 3e03745 | 2007-10-16 01:27:40 -0700 | [diff] [blame] | 842 | } |
| 843 | |
| 844 | prefetch(new->hw); |
| 845 | return new; |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 846 | } |
| 847 | |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 848 | static struct ioat_desc_sw * |
| 849 | ioat2_dma_get_next_descriptor(struct ioat_dma_chan *ioat_chan) |
| 850 | { |
Shannon Nelson | 711924b | 2007-12-17 16:20:08 -0800 | [diff] [blame] | 851 | struct ioat_desc_sw *new; |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 852 | |
| 853 | /* |
| 854 | * used.prev points to where to start processing |
| 855 | * used.next points to next free descriptor |
| 856 | * if used.prev == NULL, there are none waiting to be processed |
| 857 | * if used.next == used.prev.prev, there is only one free descriptor, |
| 858 | * and we need to use it to as a noop descriptor before |
| 859 | * linking in a new set of descriptors, since the device |
| 860 | * has probably already read the pointer to it |
| 861 | */ |
| 862 | if (ioat_chan->used_desc.prev && |
| 863 | ioat_chan->used_desc.next == ioat_chan->used_desc.prev->prev) { |
| 864 | |
Shannon Nelson | 711924b | 2007-12-17 16:20:08 -0800 | [diff] [blame] | 865 | struct ioat_desc_sw *desc; |
| 866 | struct ioat_desc_sw *noop_desc; |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 867 | int i; |
| 868 | |
| 869 | /* set up the noop descriptor */ |
| 870 | noop_desc = to_ioat_desc(ioat_chan->used_desc.next); |
| 871 | noop_desc->hw->size = 0; |
| 872 | noop_desc->hw->ctl = IOAT_DMA_DESCRIPTOR_NUL; |
| 873 | noop_desc->hw->src_addr = 0; |
| 874 | noop_desc->hw->dst_addr = 0; |
| 875 | |
| 876 | ioat_chan->used_desc.next = ioat_chan->used_desc.next->next; |
| 877 | ioat_chan->pending++; |
| 878 | ioat_chan->dmacount++; |
| 879 | |
Shannon Nelson | 711924b | 2007-12-17 16:20:08 -0800 | [diff] [blame] | 880 | /* try to get a few more descriptors */ |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 881 | for (i = 16; i; i--) { |
| 882 | desc = ioat_dma_alloc_descriptor(ioat_chan, GFP_ATOMIC); |
Shannon Nelson | 711924b | 2007-12-17 16:20:08 -0800 | [diff] [blame] | 883 | if (!desc) { |
| 884 | dev_err(&ioat_chan->device->pdev->dev, |
| 885 | "alloc failed\n"); |
| 886 | break; |
| 887 | } |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 888 | list_add_tail(&desc->node, ioat_chan->used_desc.next); |
| 889 | |
| 890 | desc->hw->next |
| 891 | = to_ioat_desc(desc->node.next)->async_tx.phys; |
| 892 | to_ioat_desc(desc->node.prev)->hw->next |
| 893 | = desc->async_tx.phys; |
| 894 | ioat_chan->desccount++; |
| 895 | } |
| 896 | |
| 897 | ioat_chan->used_desc.next = noop_desc->node.next; |
| 898 | } |
| 899 | new = to_ioat_desc(ioat_chan->used_desc.next); |
| 900 | prefetch(new); |
| 901 | ioat_chan->used_desc.next = new->node.next; |
| 902 | |
| 903 | if (ioat_chan->used_desc.prev == NULL) |
| 904 | ioat_chan->used_desc.prev = &new->node; |
| 905 | |
| 906 | prefetch(new->hw); |
| 907 | return new; |
| 908 | } |
| 909 | |
| 910 | static struct ioat_desc_sw *ioat_dma_get_next_descriptor( |
| 911 | struct ioat_dma_chan *ioat_chan) |
| 912 | { |
| 913 | if (!ioat_chan) |
| 914 | return NULL; |
| 915 | |
| 916 | switch (ioat_chan->device->version) { |
| 917 | case IOAT_VER_1_2: |
| 918 | return ioat1_dma_get_next_descriptor(ioat_chan); |
| 919 | break; |
| 920 | case IOAT_VER_2_0: |
| 921 | return ioat2_dma_get_next_descriptor(ioat_chan); |
| 922 | break; |
| 923 | } |
| 924 | return NULL; |
| 925 | } |
| 926 | |
| 927 | static struct dma_async_tx_descriptor *ioat1_dma_prep_memcpy( |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 928 | struct dma_chan *chan, |
Dan Williams | 0036731 | 2008-02-02 19:49:57 -0700 | [diff] [blame] | 929 | dma_addr_t dma_dest, |
| 930 | dma_addr_t dma_src, |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 931 | size_t len, |
Dan Williams | d4c56f9 | 2008-02-02 19:49:58 -0700 | [diff] [blame] | 932 | unsigned long flags) |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 933 | { |
Dan Williams | 7405f74 | 2007-01-02 11:10:43 -0700 | [diff] [blame] | 934 | struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); |
Shannon Nelson | 7f2b291 | 2007-10-18 03:07:14 -0700 | [diff] [blame] | 935 | struct ioat_desc_sw *new; |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 936 | |
| 937 | spin_lock_bh(&ioat_chan->desc_lock); |
Shannon Nelson | 7f2b291 | 2007-10-18 03:07:14 -0700 | [diff] [blame] | 938 | new = ioat_dma_get_next_descriptor(ioat_chan); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 939 | spin_unlock_bh(&ioat_chan->desc_lock); |
| 940 | |
Shannon Nelson | 711924b | 2007-12-17 16:20:08 -0800 | [diff] [blame] | 941 | if (new) { |
| 942 | new->len = len; |
Dan Williams | 0036731 | 2008-02-02 19:49:57 -0700 | [diff] [blame] | 943 | new->dst = dma_dest; |
| 944 | new->src = dma_src; |
Dan Williams | 636bdea | 2008-04-17 20:17:26 -0700 | [diff] [blame] | 945 | new->async_tx.flags = flags; |
Shannon Nelson | 711924b | 2007-12-17 16:20:08 -0800 | [diff] [blame] | 946 | return &new->async_tx; |
Maciej Sosnowski | 09177e8 | 2008-07-22 10:07:33 -0700 | [diff] [blame^] | 947 | } else { |
| 948 | dev_err(&ioat_chan->device->pdev->dev, |
| 949 | "chan%d - get_next_desc failed: %d descs waiting, %d total desc\n", |
| 950 | chan_num(ioat_chan), ioat_chan->dmacount, ioat_chan->desccount); |
Shannon Nelson | 711924b | 2007-12-17 16:20:08 -0800 | [diff] [blame] | 951 | return NULL; |
Maciej Sosnowski | 09177e8 | 2008-07-22 10:07:33 -0700 | [diff] [blame^] | 952 | } |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 953 | } |
| 954 | |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 955 | static struct dma_async_tx_descriptor *ioat2_dma_prep_memcpy( |
| 956 | struct dma_chan *chan, |
Dan Williams | 0036731 | 2008-02-02 19:49:57 -0700 | [diff] [blame] | 957 | dma_addr_t dma_dest, |
| 958 | dma_addr_t dma_src, |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 959 | size_t len, |
Dan Williams | d4c56f9 | 2008-02-02 19:49:58 -0700 | [diff] [blame] | 960 | unsigned long flags) |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 961 | { |
| 962 | struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); |
| 963 | struct ioat_desc_sw *new; |
| 964 | |
| 965 | spin_lock_bh(&ioat_chan->desc_lock); |
| 966 | new = ioat2_dma_get_next_descriptor(ioat_chan); |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 967 | |
Shannon Nelson | 711924b | 2007-12-17 16:20:08 -0800 | [diff] [blame] | 968 | /* |
| 969 | * leave ioat_chan->desc_lock set in ioat 2 path |
| 970 | * it will get unlocked at end of tx_submit |
| 971 | */ |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 972 | |
Shannon Nelson | 711924b | 2007-12-17 16:20:08 -0800 | [diff] [blame] | 973 | if (new) { |
| 974 | new->len = len; |
Dan Williams | 0036731 | 2008-02-02 19:49:57 -0700 | [diff] [blame] | 975 | new->dst = dma_dest; |
| 976 | new->src = dma_src; |
Dan Williams | 636bdea | 2008-04-17 20:17:26 -0700 | [diff] [blame] | 977 | new->async_tx.flags = flags; |
Shannon Nelson | 711924b | 2007-12-17 16:20:08 -0800 | [diff] [blame] | 978 | return &new->async_tx; |
Maciej Sosnowski | 09177e8 | 2008-07-22 10:07:33 -0700 | [diff] [blame^] | 979 | } else { |
| 980 | spin_unlock_bh(&ioat_chan->desc_lock); |
| 981 | dev_err(&ioat_chan->device->pdev->dev, |
| 982 | "chan%d - get_next_desc failed: %d descs waiting, %d total desc\n", |
| 983 | chan_num(ioat_chan), ioat_chan->dmacount, ioat_chan->desccount); |
Shannon Nelson | 711924b | 2007-12-17 16:20:08 -0800 | [diff] [blame] | 984 | return NULL; |
Maciej Sosnowski | 09177e8 | 2008-07-22 10:07:33 -0700 | [diff] [blame^] | 985 | } |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 986 | } |
| 987 | |
Shannon Nelson | 3e03745 | 2007-10-16 01:27:40 -0700 | [diff] [blame] | 988 | static void ioat_dma_cleanup_tasklet(unsigned long data) |
| 989 | { |
| 990 | struct ioat_dma_chan *chan = (void *)data; |
| 991 | ioat_dma_memcpy_cleanup(chan); |
| 992 | writew(IOAT_CHANCTRL_INT_DISABLE, |
| 993 | chan->reg_base + IOAT_CHANCTRL_OFFSET); |
| 994 | } |
| 995 | |
Dan Williams | e1d181e | 2008-07-04 00:13:40 -0700 | [diff] [blame] | 996 | static void |
| 997 | ioat_dma_unmap(struct ioat_dma_chan *ioat_chan, struct ioat_desc_sw *desc) |
| 998 | { |
| 999 | /* |
| 1000 | * yes we are unmapping both _page and _single |
| 1001 | * alloc'd regions with unmap_page. Is this |
| 1002 | * *really* that bad? |
| 1003 | */ |
| 1004 | if (!(desc->async_tx.flags & DMA_COMPL_SKIP_DEST_UNMAP)) |
| 1005 | pci_unmap_page(ioat_chan->device->pdev, |
| 1006 | pci_unmap_addr(desc, dst), |
| 1007 | pci_unmap_len(desc, len), |
| 1008 | PCI_DMA_FROMDEVICE); |
| 1009 | |
| 1010 | if (!(desc->async_tx.flags & DMA_COMPL_SKIP_SRC_UNMAP)) |
| 1011 | pci_unmap_page(ioat_chan->device->pdev, |
| 1012 | pci_unmap_addr(desc, src), |
| 1013 | pci_unmap_len(desc, len), |
| 1014 | PCI_DMA_TODEVICE); |
| 1015 | } |
| 1016 | |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 1017 | /** |
| 1018 | * ioat_dma_memcpy_cleanup - cleanup up finished descriptors |
| 1019 | * @chan: ioat channel to be cleaned up |
| 1020 | */ |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1021 | static void ioat_dma_memcpy_cleanup(struct ioat_dma_chan *ioat_chan) |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1022 | { |
| 1023 | unsigned long phys_complete; |
| 1024 | struct ioat_desc_sw *desc, *_desc; |
| 1025 | dma_cookie_t cookie = 0; |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 1026 | unsigned long desc_phys; |
| 1027 | struct ioat_desc_sw *latest_desc; |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1028 | |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1029 | prefetch(ioat_chan->completion_virt); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1030 | |
Shannon Nelson | 7f2b291 | 2007-10-18 03:07:14 -0700 | [diff] [blame] | 1031 | if (!spin_trylock_bh(&ioat_chan->cleanup_lock)) |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1032 | return; |
| 1033 | |
| 1034 | /* The completion writeback can happen at any time, |
| 1035 | so reads by the driver need to be atomic operations |
| 1036 | The descriptor physical addresses are limited to 32-bits |
| 1037 | when the CPU can only do a 32-bit mov */ |
| 1038 | |
| 1039 | #if (BITS_PER_LONG == 64) |
| 1040 | phys_complete = |
Shannon Nelson | 7f2b291 | 2007-10-18 03:07:14 -0700 | [diff] [blame] | 1041 | ioat_chan->completion_virt->full |
| 1042 | & IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR; |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1043 | #else |
Shannon Nelson | 7f2b291 | 2007-10-18 03:07:14 -0700 | [diff] [blame] | 1044 | phys_complete = |
| 1045 | ioat_chan->completion_virt->low & IOAT_LOW_COMPLETION_MASK; |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1046 | #endif |
| 1047 | |
Shannon Nelson | 7f2b291 | 2007-10-18 03:07:14 -0700 | [diff] [blame] | 1048 | if ((ioat_chan->completion_virt->full |
| 1049 | & IOAT_CHANSTS_DMA_TRANSFER_STATUS) == |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1050 | IOAT_CHANSTS_DMA_TRANSFER_STATUS_HALTED) { |
| 1051 | dev_err(&ioat_chan->device->pdev->dev, |
Shannon Nelson | 5149fd0 | 2007-10-18 03:07:13 -0700 | [diff] [blame] | 1052 | "Channel halted, chanerr = %x\n", |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1053 | readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET)); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1054 | |
| 1055 | /* TODO do something to salvage the situation */ |
| 1056 | } |
| 1057 | |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1058 | if (phys_complete == ioat_chan->last_completion) { |
Shannon Nelson | 7f2b291 | 2007-10-18 03:07:14 -0700 | [diff] [blame] | 1059 | spin_unlock_bh(&ioat_chan->cleanup_lock); |
Maciej Sosnowski | 09177e8 | 2008-07-22 10:07:33 -0700 | [diff] [blame^] | 1060 | /* |
| 1061 | * perhaps we're stuck so hard that the watchdog can't go off? |
| 1062 | * try to catch it after 2 seconds |
| 1063 | */ |
| 1064 | if (time_after(jiffies, |
| 1065 | ioat_chan->last_completion_time + HZ*WATCHDOG_DELAY)) { |
| 1066 | ioat_dma_chan_watchdog(&(ioat_chan->device->work.work)); |
| 1067 | ioat_chan->last_completion_time = jiffies; |
| 1068 | } |
| 1069 | return; |
| 1070 | } |
| 1071 | ioat_chan->last_completion_time = jiffies; |
| 1072 | |
| 1073 | cookie = 0; |
| 1074 | if (!spin_trylock_bh(&ioat_chan->desc_lock)) { |
| 1075 | spin_unlock_bh(&ioat_chan->cleanup_lock); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1076 | return; |
| 1077 | } |
| 1078 | |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 1079 | switch (ioat_chan->device->version) { |
| 1080 | case IOAT_VER_1_2: |
| 1081 | list_for_each_entry_safe(desc, _desc, |
| 1082 | &ioat_chan->used_desc, node) { |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1083 | |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1084 | /* |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 1085 | * Incoming DMA requests may use multiple descriptors, |
| 1086 | * due to exceeding xfercap, perhaps. If so, only the |
| 1087 | * last one will have a cookie, and require unmapping. |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1088 | */ |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 1089 | if (desc->async_tx.cookie) { |
| 1090 | cookie = desc->async_tx.cookie; |
Dan Williams | e1d181e | 2008-07-04 00:13:40 -0700 | [diff] [blame] | 1091 | ioat_dma_unmap(ioat_chan, desc); |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 1092 | if (desc->async_tx.callback) { |
| 1093 | desc->async_tx.callback(desc->async_tx.callback_param); |
| 1094 | desc->async_tx.callback = NULL; |
| 1095 | } |
| 1096 | } |
| 1097 | |
| 1098 | if (desc->async_tx.phys != phys_complete) { |
| 1099 | /* |
| 1100 | * a completed entry, but not the last, so clean |
| 1101 | * up if the client is done with the descriptor |
| 1102 | */ |
Dan Williams | 636bdea | 2008-04-17 20:17:26 -0700 | [diff] [blame] | 1103 | if (async_tx_test_ack(&desc->async_tx)) { |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 1104 | list_del(&desc->node); |
| 1105 | list_add_tail(&desc->node, |
| 1106 | &ioat_chan->free_desc); |
| 1107 | } else |
| 1108 | desc->async_tx.cookie = 0; |
| 1109 | } else { |
| 1110 | /* |
| 1111 | * last used desc. Do not remove, so we can |
| 1112 | * append from it, but don't look at it next |
| 1113 | * time, either |
| 1114 | */ |
| 1115 | desc->async_tx.cookie = 0; |
| 1116 | |
| 1117 | /* TODO check status bits? */ |
| 1118 | break; |
Shannon Nelson | 9521843 | 2007-10-18 03:07:15 -0700 | [diff] [blame] | 1119 | } |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1120 | } |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 1121 | break; |
| 1122 | case IOAT_VER_2_0: |
| 1123 | /* has some other thread has already cleaned up? */ |
| 1124 | if (ioat_chan->used_desc.prev == NULL) |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1125 | break; |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 1126 | |
| 1127 | /* work backwards to find latest finished desc */ |
| 1128 | desc = to_ioat_desc(ioat_chan->used_desc.next); |
| 1129 | latest_desc = NULL; |
| 1130 | do { |
| 1131 | desc = to_ioat_desc(desc->node.prev); |
| 1132 | desc_phys = (unsigned long)desc->async_tx.phys |
| 1133 | & IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR; |
| 1134 | if (desc_phys == phys_complete) { |
| 1135 | latest_desc = desc; |
| 1136 | break; |
| 1137 | } |
| 1138 | } while (&desc->node != ioat_chan->used_desc.prev); |
| 1139 | |
| 1140 | if (latest_desc != NULL) { |
| 1141 | |
| 1142 | /* work forwards to clear finished descriptors */ |
| 1143 | for (desc = to_ioat_desc(ioat_chan->used_desc.prev); |
| 1144 | &desc->node != latest_desc->node.next && |
| 1145 | &desc->node != ioat_chan->used_desc.next; |
| 1146 | desc = to_ioat_desc(desc->node.next)) { |
| 1147 | if (desc->async_tx.cookie) { |
| 1148 | cookie = desc->async_tx.cookie; |
| 1149 | desc->async_tx.cookie = 0; |
Dan Williams | e1d181e | 2008-07-04 00:13:40 -0700 | [diff] [blame] | 1150 | ioat_dma_unmap(ioat_chan, desc); |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 1151 | if (desc->async_tx.callback) { |
| 1152 | desc->async_tx.callback(desc->async_tx.callback_param); |
| 1153 | desc->async_tx.callback = NULL; |
| 1154 | } |
| 1155 | } |
| 1156 | } |
| 1157 | |
| 1158 | /* move used.prev up beyond those that are finished */ |
| 1159 | if (&desc->node == ioat_chan->used_desc.next) |
| 1160 | ioat_chan->used_desc.prev = NULL; |
| 1161 | else |
| 1162 | ioat_chan->used_desc.prev = &desc->node; |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1163 | } |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 1164 | break; |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1165 | } |
| 1166 | |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1167 | spin_unlock_bh(&ioat_chan->desc_lock); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1168 | |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1169 | ioat_chan->last_completion = phys_complete; |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1170 | if (cookie != 0) |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1171 | ioat_chan->completed_cookie = cookie; |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1172 | |
Shannon Nelson | 7f2b291 | 2007-10-18 03:07:14 -0700 | [diff] [blame] | 1173 | spin_unlock_bh(&ioat_chan->cleanup_lock); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1174 | } |
| 1175 | |
| 1176 | /** |
| 1177 | * ioat_dma_is_complete - poll the status of a IOAT DMA transaction |
| 1178 | * @chan: IOAT DMA channel handle |
| 1179 | * @cookie: DMA transaction identifier |
Randy Dunlap | 6508871 | 2006-07-03 19:45:31 -0700 | [diff] [blame] | 1180 | * @done: if not %NULL, updated with last completed transaction |
| 1181 | * @used: if not %NULL, updated with last used transaction |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1182 | */ |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1183 | static enum dma_status ioat_dma_is_complete(struct dma_chan *chan, |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1184 | dma_cookie_t cookie, |
| 1185 | dma_cookie_t *done, |
| 1186 | dma_cookie_t *used) |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1187 | { |
| 1188 | struct ioat_dma_chan *ioat_chan = to_ioat_chan(chan); |
| 1189 | dma_cookie_t last_used; |
| 1190 | dma_cookie_t last_complete; |
| 1191 | enum dma_status ret; |
| 1192 | |
| 1193 | last_used = chan->cookie; |
| 1194 | last_complete = ioat_chan->completed_cookie; |
Maciej Sosnowski | 09177e8 | 2008-07-22 10:07:33 -0700 | [diff] [blame^] | 1195 | ioat_chan->watchdog_tcp_cookie = cookie; |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1196 | |
| 1197 | if (done) |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1198 | *done = last_complete; |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1199 | if (used) |
| 1200 | *used = last_used; |
| 1201 | |
| 1202 | ret = dma_async_is_complete(cookie, last_complete, last_used); |
| 1203 | if (ret == DMA_SUCCESS) |
| 1204 | return ret; |
| 1205 | |
| 1206 | ioat_dma_memcpy_cleanup(ioat_chan); |
| 1207 | |
| 1208 | last_used = chan->cookie; |
| 1209 | last_complete = ioat_chan->completed_cookie; |
| 1210 | |
| 1211 | if (done) |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1212 | *done = last_complete; |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1213 | if (used) |
| 1214 | *used = last_used; |
| 1215 | |
| 1216 | return dma_async_is_complete(cookie, last_complete, last_used); |
| 1217 | } |
| 1218 | |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1219 | static void ioat_dma_start_null_desc(struct ioat_dma_chan *ioat_chan) |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1220 | { |
| 1221 | struct ioat_desc_sw *desc; |
| 1222 | |
| 1223 | spin_lock_bh(&ioat_chan->desc_lock); |
| 1224 | |
Shannon Nelson | 3e03745 | 2007-10-16 01:27:40 -0700 | [diff] [blame] | 1225 | desc = ioat_dma_get_next_descriptor(ioat_chan); |
Shannon Nelson | 7f2b291 | 2007-10-18 03:07:14 -0700 | [diff] [blame] | 1226 | desc->hw->ctl = IOAT_DMA_DESCRIPTOR_NUL |
| 1227 | | IOAT_DMA_DESCRIPTOR_CTL_INT_GN |
| 1228 | | IOAT_DMA_DESCRIPTOR_CTL_CP_STS; |
Shannon Nelson | 7f2b291 | 2007-10-18 03:07:14 -0700 | [diff] [blame] | 1229 | desc->hw->size = 0; |
| 1230 | desc->hw->src_addr = 0; |
| 1231 | desc->hw->dst_addr = 0; |
Dan Williams | 636bdea | 2008-04-17 20:17:26 -0700 | [diff] [blame] | 1232 | async_tx_ack(&desc->async_tx); |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 1233 | switch (ioat_chan->device->version) { |
| 1234 | case IOAT_VER_1_2: |
| 1235 | desc->hw->next = 0; |
| 1236 | list_add_tail(&desc->node, &ioat_chan->used_desc); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1237 | |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 1238 | writel(((u64) desc->async_tx.phys) & 0x00000000FFFFFFFF, |
| 1239 | ioat_chan->reg_base + IOAT1_CHAINADDR_OFFSET_LOW); |
| 1240 | writel(((u64) desc->async_tx.phys) >> 32, |
| 1241 | ioat_chan->reg_base + IOAT1_CHAINADDR_OFFSET_HIGH); |
| 1242 | |
| 1243 | writeb(IOAT_CHANCMD_START, ioat_chan->reg_base |
| 1244 | + IOAT_CHANCMD_OFFSET(ioat_chan->device->version)); |
| 1245 | break; |
| 1246 | case IOAT_VER_2_0: |
| 1247 | writel(((u64) desc->async_tx.phys) & 0x00000000FFFFFFFF, |
| 1248 | ioat_chan->reg_base + IOAT2_CHAINADDR_OFFSET_LOW); |
| 1249 | writel(((u64) desc->async_tx.phys) >> 32, |
| 1250 | ioat_chan->reg_base + IOAT2_CHAINADDR_OFFSET_HIGH); |
| 1251 | |
| 1252 | ioat_chan->dmacount++; |
| 1253 | __ioat2_dma_memcpy_issue_pending(ioat_chan); |
| 1254 | break; |
| 1255 | } |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1256 | spin_unlock_bh(&ioat_chan->desc_lock); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1257 | } |
| 1258 | |
| 1259 | /* |
| 1260 | * Perform a IOAT transaction to verify the HW works. |
| 1261 | */ |
| 1262 | #define IOAT_TEST_SIZE 2000 |
| 1263 | |
Shannon Nelson | 9521843 | 2007-10-18 03:07:15 -0700 | [diff] [blame] | 1264 | static void ioat_dma_test_callback(void *dma_async_param) |
| 1265 | { |
| 1266 | printk(KERN_ERR "ioatdma: ioat_dma_test_callback(%p)\n", |
Shannon Nelson | 711924b | 2007-12-17 16:20:08 -0800 | [diff] [blame] | 1267 | dma_async_param); |
Shannon Nelson | 9521843 | 2007-10-18 03:07:15 -0700 | [diff] [blame] | 1268 | } |
| 1269 | |
Shannon Nelson | 3e03745 | 2007-10-16 01:27:40 -0700 | [diff] [blame] | 1270 | /** |
| 1271 | * ioat_dma_self_test - Perform a IOAT transaction to verify the HW works. |
| 1272 | * @device: device to be tested |
| 1273 | */ |
| 1274 | static int ioat_dma_self_test(struct ioatdma_device *device) |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1275 | { |
| 1276 | int i; |
| 1277 | u8 *src; |
| 1278 | u8 *dest; |
| 1279 | struct dma_chan *dma_chan; |
Shannon Nelson | 711924b | 2007-12-17 16:20:08 -0800 | [diff] [blame] | 1280 | struct dma_async_tx_descriptor *tx; |
Dan Williams | 0036731 | 2008-02-02 19:49:57 -0700 | [diff] [blame] | 1281 | dma_addr_t dma_dest, dma_src; |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1282 | dma_cookie_t cookie; |
| 1283 | int err = 0; |
| 1284 | |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 1285 | src = kzalloc(sizeof(u8) * IOAT_TEST_SIZE, GFP_KERNEL); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1286 | if (!src) |
| 1287 | return -ENOMEM; |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 1288 | dest = kzalloc(sizeof(u8) * IOAT_TEST_SIZE, GFP_KERNEL); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1289 | if (!dest) { |
| 1290 | kfree(src); |
| 1291 | return -ENOMEM; |
| 1292 | } |
| 1293 | |
| 1294 | /* Fill in src buffer */ |
| 1295 | for (i = 0; i < IOAT_TEST_SIZE; i++) |
| 1296 | src[i] = (u8)i; |
| 1297 | |
| 1298 | /* Start copy, using first DMA channel */ |
| 1299 | dma_chan = container_of(device->common.channels.next, |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1300 | struct dma_chan, |
| 1301 | device_node); |
Haavard Skinnemoen | 848c536 | 2008-07-08 11:58:58 -0700 | [diff] [blame] | 1302 | if (device->common.device_alloc_chan_resources(dma_chan, NULL) < 1) { |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1303 | dev_err(&device->pdev->dev, |
| 1304 | "selftest cannot allocate chan resource\n"); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1305 | err = -ENODEV; |
| 1306 | goto out; |
| 1307 | } |
| 1308 | |
Dan Williams | 0036731 | 2008-02-02 19:49:57 -0700 | [diff] [blame] | 1309 | dma_src = dma_map_single(dma_chan->device->dev, src, IOAT_TEST_SIZE, |
| 1310 | DMA_TO_DEVICE); |
| 1311 | dma_dest = dma_map_single(dma_chan->device->dev, dest, IOAT_TEST_SIZE, |
| 1312 | DMA_FROM_DEVICE); |
| 1313 | tx = device->common.device_prep_dma_memcpy(dma_chan, dma_dest, dma_src, |
| 1314 | IOAT_TEST_SIZE, 0); |
Shannon Nelson | 5149fd0 | 2007-10-18 03:07:13 -0700 | [diff] [blame] | 1315 | if (!tx) { |
| 1316 | dev_err(&device->pdev->dev, |
| 1317 | "Self-test prep failed, disabling\n"); |
| 1318 | err = -ENODEV; |
| 1319 | goto free_resources; |
| 1320 | } |
| 1321 | |
Dan Williams | 7405f74 | 2007-01-02 11:10:43 -0700 | [diff] [blame] | 1322 | async_tx_ack(tx); |
Shannon Nelson | 9521843 | 2007-10-18 03:07:15 -0700 | [diff] [blame] | 1323 | tx->callback = ioat_dma_test_callback; |
| 1324 | tx->callback_param = (void *)0x8086; |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 1325 | cookie = tx->tx_submit(tx); |
Shannon Nelson | 7f2b291 | 2007-10-18 03:07:14 -0700 | [diff] [blame] | 1326 | if (cookie < 0) { |
| 1327 | dev_err(&device->pdev->dev, |
| 1328 | "Self-test setup failed, disabling\n"); |
| 1329 | err = -ENODEV; |
| 1330 | goto free_resources; |
| 1331 | } |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 1332 | device->common.device_issue_pending(dma_chan); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1333 | msleep(1); |
| 1334 | |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 1335 | if (device->common.device_is_tx_complete(dma_chan, cookie, NULL, NULL) |
| 1336 | != DMA_SUCCESS) { |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1337 | dev_err(&device->pdev->dev, |
Shannon Nelson | 5149fd0 | 2007-10-18 03:07:13 -0700 | [diff] [blame] | 1338 | "Self-test copy timed out, disabling\n"); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1339 | err = -ENODEV; |
| 1340 | goto free_resources; |
| 1341 | } |
| 1342 | if (memcmp(src, dest, IOAT_TEST_SIZE)) { |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1343 | dev_err(&device->pdev->dev, |
Shannon Nelson | 5149fd0 | 2007-10-18 03:07:13 -0700 | [diff] [blame] | 1344 | "Self-test copy failed compare, disabling\n"); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1345 | err = -ENODEV; |
| 1346 | goto free_resources; |
| 1347 | } |
| 1348 | |
| 1349 | free_resources: |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 1350 | device->common.device_free_chan_resources(dma_chan); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1351 | out: |
| 1352 | kfree(src); |
| 1353 | kfree(dest); |
| 1354 | return err; |
| 1355 | } |
| 1356 | |
Shannon Nelson | 3e03745 | 2007-10-16 01:27:40 -0700 | [diff] [blame] | 1357 | static char ioat_interrupt_style[32] = "msix"; |
| 1358 | module_param_string(ioat_interrupt_style, ioat_interrupt_style, |
| 1359 | sizeof(ioat_interrupt_style), 0644); |
| 1360 | MODULE_PARM_DESC(ioat_interrupt_style, |
| 1361 | "set ioat interrupt style: msix (default), " |
| 1362 | "msix-single-vector, msi, intx)"); |
| 1363 | |
| 1364 | /** |
| 1365 | * ioat_dma_setup_interrupts - setup interrupt handler |
| 1366 | * @device: ioat device |
| 1367 | */ |
| 1368 | static int ioat_dma_setup_interrupts(struct ioatdma_device *device) |
| 1369 | { |
| 1370 | struct ioat_dma_chan *ioat_chan; |
| 1371 | int err, i, j, msixcnt; |
| 1372 | u8 intrctrl = 0; |
| 1373 | |
| 1374 | if (!strcmp(ioat_interrupt_style, "msix")) |
| 1375 | goto msix; |
| 1376 | if (!strcmp(ioat_interrupt_style, "msix-single-vector")) |
| 1377 | goto msix_single_vector; |
| 1378 | if (!strcmp(ioat_interrupt_style, "msi")) |
| 1379 | goto msi; |
| 1380 | if (!strcmp(ioat_interrupt_style, "intx")) |
| 1381 | goto intx; |
Shannon Nelson | 5149fd0 | 2007-10-18 03:07:13 -0700 | [diff] [blame] | 1382 | dev_err(&device->pdev->dev, "invalid ioat_interrupt_style %s\n", |
| 1383 | ioat_interrupt_style); |
| 1384 | goto err_no_irq; |
Shannon Nelson | 3e03745 | 2007-10-16 01:27:40 -0700 | [diff] [blame] | 1385 | |
| 1386 | msix: |
| 1387 | /* The number of MSI-X vectors should equal the number of channels */ |
| 1388 | msixcnt = device->common.chancnt; |
| 1389 | for (i = 0; i < msixcnt; i++) |
| 1390 | device->msix_entries[i].entry = i; |
| 1391 | |
| 1392 | err = pci_enable_msix(device->pdev, device->msix_entries, msixcnt); |
| 1393 | if (err < 0) |
| 1394 | goto msi; |
| 1395 | if (err > 0) |
| 1396 | goto msix_single_vector; |
| 1397 | |
| 1398 | for (i = 0; i < msixcnt; i++) { |
| 1399 | ioat_chan = ioat_lookup_chan_by_index(device, i); |
| 1400 | err = request_irq(device->msix_entries[i].vector, |
| 1401 | ioat_dma_do_interrupt_msix, |
| 1402 | 0, "ioat-msix", ioat_chan); |
| 1403 | if (err) { |
| 1404 | for (j = 0; j < i; j++) { |
| 1405 | ioat_chan = |
| 1406 | ioat_lookup_chan_by_index(device, j); |
| 1407 | free_irq(device->msix_entries[j].vector, |
| 1408 | ioat_chan); |
| 1409 | } |
| 1410 | goto msix_single_vector; |
| 1411 | } |
| 1412 | } |
| 1413 | intrctrl |= IOAT_INTRCTRL_MSIX_VECTOR_CONTROL; |
| 1414 | device->irq_mode = msix_multi_vector; |
| 1415 | goto done; |
| 1416 | |
| 1417 | msix_single_vector: |
| 1418 | device->msix_entries[0].entry = 0; |
| 1419 | err = pci_enable_msix(device->pdev, device->msix_entries, 1); |
| 1420 | if (err) |
| 1421 | goto msi; |
| 1422 | |
| 1423 | err = request_irq(device->msix_entries[0].vector, ioat_dma_do_interrupt, |
| 1424 | 0, "ioat-msix", device); |
| 1425 | if (err) { |
| 1426 | pci_disable_msix(device->pdev); |
| 1427 | goto msi; |
| 1428 | } |
| 1429 | device->irq_mode = msix_single_vector; |
| 1430 | goto done; |
| 1431 | |
| 1432 | msi: |
| 1433 | err = pci_enable_msi(device->pdev); |
| 1434 | if (err) |
| 1435 | goto intx; |
| 1436 | |
| 1437 | err = request_irq(device->pdev->irq, ioat_dma_do_interrupt, |
| 1438 | 0, "ioat-msi", device); |
| 1439 | if (err) { |
| 1440 | pci_disable_msi(device->pdev); |
| 1441 | goto intx; |
| 1442 | } |
| 1443 | /* |
| 1444 | * CB 1.2 devices need a bit set in configuration space to enable MSI |
| 1445 | */ |
| 1446 | if (device->version == IOAT_VER_1_2) { |
| 1447 | u32 dmactrl; |
| 1448 | pci_read_config_dword(device->pdev, |
| 1449 | IOAT_PCI_DMACTRL_OFFSET, &dmactrl); |
| 1450 | dmactrl |= IOAT_PCI_DMACTRL_MSI_EN; |
| 1451 | pci_write_config_dword(device->pdev, |
| 1452 | IOAT_PCI_DMACTRL_OFFSET, dmactrl); |
| 1453 | } |
| 1454 | device->irq_mode = msi; |
| 1455 | goto done; |
| 1456 | |
| 1457 | intx: |
| 1458 | err = request_irq(device->pdev->irq, ioat_dma_do_interrupt, |
| 1459 | IRQF_SHARED, "ioat-intx", device); |
| 1460 | if (err) |
| 1461 | goto err_no_irq; |
| 1462 | device->irq_mode = intx; |
| 1463 | |
| 1464 | done: |
| 1465 | intrctrl |= IOAT_INTRCTRL_MASTER_INT_EN; |
| 1466 | writeb(intrctrl, device->reg_base + IOAT_INTRCTRL_OFFSET); |
| 1467 | return 0; |
| 1468 | |
| 1469 | err_no_irq: |
| 1470 | /* Disable all interrupt generation */ |
| 1471 | writeb(0, device->reg_base + IOAT_INTRCTRL_OFFSET); |
| 1472 | dev_err(&device->pdev->dev, "no usable interrupts\n"); |
| 1473 | device->irq_mode = none; |
| 1474 | return -1; |
| 1475 | } |
| 1476 | |
| 1477 | /** |
| 1478 | * ioat_dma_remove_interrupts - remove whatever interrupts were set |
| 1479 | * @device: ioat device |
| 1480 | */ |
| 1481 | static void ioat_dma_remove_interrupts(struct ioatdma_device *device) |
| 1482 | { |
| 1483 | struct ioat_dma_chan *ioat_chan; |
| 1484 | int i; |
| 1485 | |
| 1486 | /* Disable all interrupt generation */ |
| 1487 | writeb(0, device->reg_base + IOAT_INTRCTRL_OFFSET); |
| 1488 | |
| 1489 | switch (device->irq_mode) { |
| 1490 | case msix_multi_vector: |
| 1491 | for (i = 0; i < device->common.chancnt; i++) { |
| 1492 | ioat_chan = ioat_lookup_chan_by_index(device, i); |
| 1493 | free_irq(device->msix_entries[i].vector, ioat_chan); |
| 1494 | } |
| 1495 | pci_disable_msix(device->pdev); |
| 1496 | break; |
| 1497 | case msix_single_vector: |
| 1498 | free_irq(device->msix_entries[0].vector, device); |
| 1499 | pci_disable_msix(device->pdev); |
| 1500 | break; |
| 1501 | case msi: |
| 1502 | free_irq(device->pdev->irq, device); |
| 1503 | pci_disable_msi(device->pdev); |
| 1504 | break; |
| 1505 | case intx: |
| 1506 | free_irq(device->pdev->irq, device); |
| 1507 | break; |
| 1508 | case none: |
| 1509 | dev_warn(&device->pdev->dev, |
| 1510 | "call to %s without interrupts setup\n", __func__); |
| 1511 | } |
| 1512 | device->irq_mode = none; |
| 1513 | } |
| 1514 | |
Shannon Nelson | 8ab8956 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1515 | struct ioatdma_device *ioat_dma_probe(struct pci_dev *pdev, |
| 1516 | void __iomem *iobase) |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1517 | { |
| 1518 | int err; |
Shannon Nelson | 8ab8956 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1519 | struct ioatdma_device *device; |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1520 | |
| 1521 | device = kzalloc(sizeof(*device), GFP_KERNEL); |
| 1522 | if (!device) { |
| 1523 | err = -ENOMEM; |
| 1524 | goto err_kzalloc; |
| 1525 | } |
Shannon Nelson | 8ab8956 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1526 | device->pdev = pdev; |
| 1527 | device->reg_base = iobase; |
| 1528 | device->version = readb(device->reg_base + IOAT_VER_OFFSET); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1529 | |
| 1530 | /* DMA coherent memory pool for DMA descriptor allocations */ |
| 1531 | device->dma_pool = pci_pool_create("dma_desc_pool", pdev, |
Shannon Nelson | 8ab8956 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1532 | sizeof(struct ioat_dma_descriptor), |
| 1533 | 64, 0); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1534 | if (!device->dma_pool) { |
| 1535 | err = -ENOMEM; |
| 1536 | goto err_dma_pool; |
| 1537 | } |
| 1538 | |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1539 | device->completion_pool = pci_pool_create("completion_pool", pdev, |
| 1540 | sizeof(u64), SMP_CACHE_BYTES, |
| 1541 | SMP_CACHE_BYTES); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1542 | if (!device->completion_pool) { |
| 1543 | err = -ENOMEM; |
| 1544 | goto err_completion_pool; |
| 1545 | } |
| 1546 | |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1547 | INIT_LIST_HEAD(&device->common.channels); |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1548 | ioat_dma_enumerate_channels(device); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1549 | |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1550 | device->common.device_alloc_chan_resources = |
| 1551 | ioat_dma_alloc_chan_resources; |
| 1552 | device->common.device_free_chan_resources = |
| 1553 | ioat_dma_free_chan_resources; |
Dan Williams | 7405f74 | 2007-01-02 11:10:43 -0700 | [diff] [blame] | 1554 | device->common.dev = &pdev->dev; |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 1555 | |
| 1556 | dma_cap_set(DMA_MEMCPY, device->common.cap_mask); |
| 1557 | device->common.device_is_tx_complete = ioat_dma_is_complete; |
Shannon Nelson | 7bb67c1 | 2007-11-14 16:59:51 -0800 | [diff] [blame] | 1558 | switch (device->version) { |
| 1559 | case IOAT_VER_1_2: |
| 1560 | device->common.device_prep_dma_memcpy = ioat1_dma_prep_memcpy; |
| 1561 | device->common.device_issue_pending = |
| 1562 | ioat1_dma_memcpy_issue_pending; |
| 1563 | break; |
| 1564 | case IOAT_VER_2_0: |
| 1565 | device->common.device_prep_dma_memcpy = ioat2_dma_prep_memcpy; |
| 1566 | device->common.device_issue_pending = |
| 1567 | ioat2_dma_memcpy_issue_pending; |
| 1568 | break; |
| 1569 | } |
| 1570 | |
Shannon Nelson | 3e03745 | 2007-10-16 01:27:40 -0700 | [diff] [blame] | 1571 | dev_err(&device->pdev->dev, |
Shannon Nelson | 5149fd0 | 2007-10-18 03:07:13 -0700 | [diff] [blame] | 1572 | "Intel(R) I/OAT DMA Engine found," |
| 1573 | " %d channels, device version 0x%02x, driver version %s\n", |
| 1574 | device->common.chancnt, device->version, IOAT_DMA_VERSION); |
Shannon Nelson | 8ab8956 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1575 | |
Shannon Nelson | 3e03745 | 2007-10-16 01:27:40 -0700 | [diff] [blame] | 1576 | err = ioat_dma_setup_interrupts(device); |
Shannon Nelson | 8ab8956 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1577 | if (err) |
Shannon Nelson | 3e03745 | 2007-10-16 01:27:40 -0700 | [diff] [blame] | 1578 | goto err_setup_interrupts; |
Shannon Nelson | 8ab8956 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1579 | |
Shannon Nelson | 3e03745 | 2007-10-16 01:27:40 -0700 | [diff] [blame] | 1580 | err = ioat_dma_self_test(device); |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1581 | if (err) |
| 1582 | goto err_self_test; |
| 1583 | |
| 1584 | dma_async_device_register(&device->common); |
| 1585 | |
Maciej Sosnowski | 09177e8 | 2008-07-22 10:07:33 -0700 | [diff] [blame^] | 1586 | INIT_DELAYED_WORK(&device->work, ioat_dma_chan_watchdog); |
| 1587 | schedule_delayed_work(&device->work, |
| 1588 | WATCHDOG_DELAY); |
| 1589 | |
Shannon Nelson | 8ab8956 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1590 | return device; |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1591 | |
| 1592 | err_self_test: |
Shannon Nelson | 3e03745 | 2007-10-16 01:27:40 -0700 | [diff] [blame] | 1593 | ioat_dma_remove_interrupts(device); |
| 1594 | err_setup_interrupts: |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1595 | pci_pool_destroy(device->completion_pool); |
| 1596 | err_completion_pool: |
| 1597 | pci_pool_destroy(device->dma_pool); |
| 1598 | err_dma_pool: |
| 1599 | kfree(device); |
| 1600 | err_kzalloc: |
Shannon Nelson | bb8e8bc | 2007-12-17 16:20:08 -0800 | [diff] [blame] | 1601 | dev_err(&pdev->dev, |
Shannon Nelson | 5149fd0 | 2007-10-18 03:07:13 -0700 | [diff] [blame] | 1602 | "Intel(R) I/OAT DMA Engine initialization failed\n"); |
Shannon Nelson | 8ab8956 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1603 | return NULL; |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1604 | } |
| 1605 | |
Shannon Nelson | 8ab8956 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1606 | void ioat_dma_remove(struct ioatdma_device *device) |
Dan Aloni | 428ed60 | 2007-03-08 09:57:36 -0800 | [diff] [blame] | 1607 | { |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1608 | struct dma_chan *chan, *_chan; |
| 1609 | struct ioat_dma_chan *ioat_chan; |
| 1610 | |
Shannon Nelson | 3e03745 | 2007-10-16 01:27:40 -0700 | [diff] [blame] | 1611 | ioat_dma_remove_interrupts(device); |
Shannon Nelson | 8ab8956 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1612 | |
Shannon Nelson | dfe2299 | 2007-10-18 03:07:13 -0700 | [diff] [blame] | 1613 | dma_async_device_unregister(&device->common); |
| 1614 | |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1615 | pci_pool_destroy(device->dma_pool); |
| 1616 | pci_pool_destroy(device->completion_pool); |
Shannon Nelson | 8ab8956 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1617 | |
Shannon Nelson | 7df7cf0 | 2007-10-18 03:07:12 -0700 | [diff] [blame] | 1618 | iounmap(device->reg_base); |
| 1619 | pci_release_regions(device->pdev); |
| 1620 | pci_disable_device(device->pdev); |
| 1621 | |
Maciej Sosnowski | 09177e8 | 2008-07-22 10:07:33 -0700 | [diff] [blame^] | 1622 | cancel_delayed_work(&device->work); |
| 1623 | |
Shannon Nelson | 43d6e36 | 2007-10-16 01:27:39 -0700 | [diff] [blame] | 1624 | list_for_each_entry_safe(chan, _chan, |
| 1625 | &device->common.channels, device_node) { |
Chris Leech | 0bbd5f4 | 2006-05-23 17:35:34 -0700 | [diff] [blame] | 1626 | ioat_chan = to_ioat_chan(chan); |
| 1627 | list_del(&chan->device_node); |
| 1628 | kfree(ioat_chan); |
| 1629 | } |
| 1630 | kfree(device); |
| 1631 | } |
| 1632 | |