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Commit | Line | Data |
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0bbd5f4e | 1 | /* |
43d6e369 | 2 | * Intel I/OAT DMA Linux driver |
211a22ce | 3 | * Copyright(c) 2004 - 2009 Intel Corporation. |
0bbd5f4e CL |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify it | |
43d6e369 SN |
6 | * under the terms and conditions of the GNU General Public License, |
7 | * version 2, as published by the Free Software Foundation. | |
0bbd5f4e CL |
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 | |
43d6e369 SN |
15 | * this program; if not, write to the Free Software Foundation, Inc., |
16 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
17 | * | |
18 | * The full GNU General Public License is included in this distribution in | |
19 | * the file called "COPYING". | |
0bbd5f4e | 20 | * |
0bbd5f4e CL |
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> | |
6b00c92c | 34 | #include <linux/dma-mapping.h> |
09177e85 | 35 | #include <linux/workqueue.h> |
3ad0b02e | 36 | #include <linux/i7300_idle.h> |
584ec227 DW |
37 | #include "dma.h" |
38 | #include "registers.h" | |
39 | #include "hw.h" | |
0bbd5f4e | 40 | |
5cbafa65 | 41 | int ioat_pending_level = 4; |
7bb67c14 SN |
42 | module_param(ioat_pending_level, int, 0644); |
43 | MODULE_PARM_DESC(ioat_pending_level, | |
44 | "high-water mark for pushing ioat descriptors (default: 4)"); | |
45 | ||
0bbd5f4e | 46 | /* internal functions */ |
5cbafa65 DW |
47 | static void ioat1_cleanup(struct ioat_dma_chan *ioat); |
48 | static void ioat1_dma_start_null_desc(struct ioat_dma_chan *ioat); | |
3e037454 SN |
49 | |
50 | /** | |
51 | * ioat_dma_do_interrupt - handler used for single vector interrupt mode | |
52 | * @irq: interrupt id | |
53 | * @data: interrupt data | |
54 | */ | |
55 | static irqreturn_t ioat_dma_do_interrupt(int irq, void *data) | |
56 | { | |
57 | struct ioatdma_device *instance = data; | |
dcbc853a | 58 | struct ioat_chan_common *chan; |
3e037454 SN |
59 | unsigned long attnstatus; |
60 | int bit; | |
61 | u8 intrctrl; | |
62 | ||
63 | intrctrl = readb(instance->reg_base + IOAT_INTRCTRL_OFFSET); | |
64 | ||
65 | if (!(intrctrl & IOAT_INTRCTRL_MASTER_INT_EN)) | |
66 | return IRQ_NONE; | |
67 | ||
68 | if (!(intrctrl & IOAT_INTRCTRL_INT_STATUS)) { | |
69 | writeb(intrctrl, instance->reg_base + IOAT_INTRCTRL_OFFSET); | |
70 | return IRQ_NONE; | |
71 | } | |
72 | ||
73 | attnstatus = readl(instance->reg_base + IOAT_ATTNSTATUS_OFFSET); | |
984b3f57 | 74 | for_each_set_bit(bit, &attnstatus, BITS_PER_LONG) { |
dcbc853a DW |
75 | chan = ioat_chan_by_index(instance, bit); |
76 | tasklet_schedule(&chan->cleanup_task); | |
3e037454 SN |
77 | } |
78 | ||
79 | writeb(intrctrl, instance->reg_base + IOAT_INTRCTRL_OFFSET); | |
80 | return IRQ_HANDLED; | |
81 | } | |
82 | ||
83 | /** | |
84 | * ioat_dma_do_interrupt_msix - handler used for vector-per-channel interrupt mode | |
85 | * @irq: interrupt id | |
86 | * @data: interrupt data | |
87 | */ | |
88 | static irqreturn_t ioat_dma_do_interrupt_msix(int irq, void *data) | |
89 | { | |
dcbc853a | 90 | struct ioat_chan_common *chan = data; |
3e037454 | 91 | |
dcbc853a | 92 | tasklet_schedule(&chan->cleanup_task); |
3e037454 SN |
93 | |
94 | return IRQ_HANDLED; | |
95 | } | |
96 | ||
5cbafa65 | 97 | /* common channel initialization */ |
aa4d72ae | 98 | void ioat_init_channel(struct ioatdma_device *device, struct ioat_chan_common *chan, int idx) |
5cbafa65 DW |
99 | { |
100 | struct dma_device *dma = &device->common; | |
aa4d72ae DW |
101 | struct dma_chan *c = &chan->common; |
102 | unsigned long data = (unsigned long) c; | |
5cbafa65 DW |
103 | |
104 | chan->device = device; | |
105 | chan->reg_base = device->reg_base + (0x80 * (idx + 1)); | |
5cbafa65 DW |
106 | spin_lock_init(&chan->cleanup_lock); |
107 | chan->common.device = dma; | |
108 | list_add_tail(&chan->common.device_node, &dma->channels); | |
109 | device->idx[idx] = chan; | |
09c8a5b8 | 110 | init_timer(&chan->timer); |
aa4d72ae DW |
111 | chan->timer.function = device->timer_fn; |
112 | chan->timer.data = data; | |
113 | tasklet_init(&chan->cleanup_task, device->cleanup_fn, data); | |
5cbafa65 DW |
114 | tasklet_disable(&chan->cleanup_task); |
115 | } | |
116 | ||
3e037454 | 117 | /** |
5cbafa65 | 118 | * ioat1_dma_enumerate_channels - find and initialize the device's channels |
3e037454 SN |
119 | * @device: the device to be enumerated |
120 | */ | |
5cbafa65 | 121 | static int ioat1_enumerate_channels(struct ioatdma_device *device) |
0bbd5f4e CL |
122 | { |
123 | u8 xfercap_scale; | |
124 | u32 xfercap; | |
125 | int i; | |
dcbc853a | 126 | struct ioat_dma_chan *ioat; |
e6c0b69a | 127 | struct device *dev = &device->pdev->dev; |
f2427e27 | 128 | struct dma_device *dma = &device->common; |
0bbd5f4e | 129 | |
f2427e27 DW |
130 | INIT_LIST_HEAD(&dma->channels); |
131 | dma->chancnt = readb(device->reg_base + IOAT_CHANCNT_OFFSET); | |
bb320786 DW |
132 | dma->chancnt &= 0x1f; /* bits [4:0] valid */ |
133 | if (dma->chancnt > ARRAY_SIZE(device->idx)) { | |
134 | dev_warn(dev, "(%d) exceeds max supported channels (%zu)\n", | |
135 | dma->chancnt, ARRAY_SIZE(device->idx)); | |
136 | dma->chancnt = ARRAY_SIZE(device->idx); | |
137 | } | |
e3828811 | 138 | xfercap_scale = readb(device->reg_base + IOAT_XFERCAP_OFFSET); |
bb320786 | 139 | xfercap_scale &= 0x1f; /* bits [4:0] valid */ |
0bbd5f4e | 140 | xfercap = (xfercap_scale == 0 ? -1 : (1UL << xfercap_scale)); |
6df9183a | 141 | dev_dbg(dev, "%s: xfercap = %d\n", __func__, xfercap); |
0bbd5f4e | 142 | |
f371be63 | 143 | #ifdef CONFIG_I7300_IDLE_IOAT_CHANNEL |
f2427e27 DW |
144 | if (i7300_idle_platform_probe(NULL, NULL, 1) == 0) |
145 | dma->chancnt--; | |
27471fdb | 146 | #endif |
f2427e27 | 147 | for (i = 0; i < dma->chancnt; i++) { |
dcbc853a | 148 | ioat = devm_kzalloc(dev, sizeof(*ioat), GFP_KERNEL); |
5cbafa65 | 149 | if (!ioat) |
0bbd5f4e | 150 | break; |
0bbd5f4e | 151 | |
aa4d72ae | 152 | ioat_init_channel(device, &ioat->base, i); |
dcbc853a | 153 | ioat->xfercap = xfercap; |
dcbc853a DW |
154 | spin_lock_init(&ioat->desc_lock); |
155 | INIT_LIST_HEAD(&ioat->free_desc); | |
156 | INIT_LIST_HEAD(&ioat->used_desc); | |
0bbd5f4e | 157 | } |
5cbafa65 DW |
158 | dma->chancnt = i; |
159 | return i; | |
0bbd5f4e CL |
160 | } |
161 | ||
711924b1 SN |
162 | /** |
163 | * ioat_dma_memcpy_issue_pending - push potentially unrecognized appended | |
164 | * descriptors to hw | |
165 | * @chan: DMA channel handle | |
166 | */ | |
bc3c7025 | 167 | static inline void |
dcbc853a | 168 | __ioat1_dma_memcpy_issue_pending(struct ioat_dma_chan *ioat) |
711924b1 | 169 | { |
dcbc853a DW |
170 | void __iomem *reg_base = ioat->base.reg_base; |
171 | ||
6df9183a DW |
172 | dev_dbg(to_dev(&ioat->base), "%s: pending: %d\n", |
173 | __func__, ioat->pending); | |
dcbc853a DW |
174 | ioat->pending = 0; |
175 | writeb(IOAT_CHANCMD_APPEND, reg_base + IOAT1_CHANCMD_OFFSET); | |
711924b1 SN |
176 | } |
177 | ||
178 | static void ioat1_dma_memcpy_issue_pending(struct dma_chan *chan) | |
179 | { | |
dcbc853a | 180 | struct ioat_dma_chan *ioat = to_ioat_chan(chan); |
711924b1 | 181 | |
dcbc853a DW |
182 | if (ioat->pending > 0) { |
183 | spin_lock_bh(&ioat->desc_lock); | |
184 | __ioat1_dma_memcpy_issue_pending(ioat); | |
185 | spin_unlock_bh(&ioat->desc_lock); | |
711924b1 SN |
186 | } |
187 | } | |
188 | ||
09177e85 | 189 | /** |
5cbafa65 | 190 | * ioat1_reset_channel - restart a channel |
dcbc853a | 191 | * @ioat: IOAT DMA channel handle |
09177e85 | 192 | */ |
5cbafa65 | 193 | static void ioat1_reset_channel(struct ioat_dma_chan *ioat) |
09177e85 | 194 | { |
dcbc853a DW |
195 | struct ioat_chan_common *chan = &ioat->base; |
196 | void __iomem *reg_base = chan->reg_base; | |
09177e85 MS |
197 | u32 chansts, chanerr; |
198 | ||
09c8a5b8 | 199 | dev_warn(to_dev(chan), "reset\n"); |
dcbc853a | 200 | chanerr = readl(reg_base + IOAT_CHANERR_OFFSET); |
09c8a5b8 | 201 | chansts = *chan->completion & IOAT_CHANSTS_STATUS; |
09177e85 | 202 | if (chanerr) { |
dcbc853a | 203 | dev_err(to_dev(chan), |
09177e85 | 204 | "chan%d, CHANSTS = 0x%08x CHANERR = 0x%04x, clearing\n", |
dcbc853a DW |
205 | chan_num(chan), chansts, chanerr); |
206 | writel(chanerr, reg_base + IOAT_CHANERR_OFFSET); | |
09177e85 MS |
207 | } |
208 | ||
209 | /* | |
210 | * whack it upside the head with a reset | |
211 | * and wait for things to settle out. | |
212 | * force the pending count to a really big negative | |
213 | * to make sure no one forces an issue_pending | |
214 | * while we're waiting. | |
215 | */ | |
216 | ||
dcbc853a | 217 | ioat->pending = INT_MIN; |
09177e85 | 218 | writeb(IOAT_CHANCMD_RESET, |
dcbc853a | 219 | reg_base + IOAT_CHANCMD_OFFSET(chan->device->version)); |
09c8a5b8 DW |
220 | set_bit(IOAT_RESET_PENDING, &chan->state); |
221 | mod_timer(&chan->timer, jiffies + RESET_DELAY); | |
09177e85 MS |
222 | } |
223 | ||
7bb67c14 | 224 | static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx) |
7405f74b | 225 | { |
dcbc853a DW |
226 | struct dma_chan *c = tx->chan; |
227 | struct ioat_dma_chan *ioat = to_ioat_chan(c); | |
a0587bcf | 228 | struct ioat_desc_sw *desc = tx_to_ioat_desc(tx); |
09c8a5b8 | 229 | struct ioat_chan_common *chan = &ioat->base; |
a0587bcf DW |
230 | struct ioat_desc_sw *first; |
231 | struct ioat_desc_sw *chain_tail; | |
7405f74b | 232 | dma_cookie_t cookie; |
7405f74b | 233 | |
dcbc853a | 234 | spin_lock_bh(&ioat->desc_lock); |
7405f74b | 235 | /* cookie incr and addition to used_list must be atomic */ |
dcbc853a | 236 | cookie = c->cookie; |
7405f74b DW |
237 | cookie++; |
238 | if (cookie < 0) | |
239 | cookie = 1; | |
dcbc853a DW |
240 | c->cookie = cookie; |
241 | tx->cookie = cookie; | |
6df9183a | 242 | dev_dbg(to_dev(&ioat->base), "%s: cookie: %d\n", __func__, cookie); |
7405f74b DW |
243 | |
244 | /* write address into NextDescriptor field of last desc in chain */ | |
ea25968a | 245 | first = to_ioat_desc(desc->tx_list.next); |
dcbc853a | 246 | chain_tail = to_ioat_desc(ioat->used_desc.prev); |
a0587bcf DW |
247 | /* make descriptor updates globally visible before chaining */ |
248 | wmb(); | |
249 | chain_tail->hw->next = first->txd.phys; | |
ea25968a | 250 | list_splice_tail_init(&desc->tx_list, &ioat->used_desc); |
6df9183a DW |
251 | dump_desc_dbg(ioat, chain_tail); |
252 | dump_desc_dbg(ioat, first); | |
a0587bcf | 253 | |
09c8a5b8 DW |
254 | if (!test_and_set_bit(IOAT_COMPLETION_PENDING, &chan->state)) |
255 | mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); | |
256 | ||
5669e31c | 257 | ioat->active += desc->hw->tx_cnt; |
ad643f54 | 258 | ioat->pending += desc->hw->tx_cnt; |
dcbc853a DW |
259 | if (ioat->pending >= ioat_pending_level) |
260 | __ioat1_dma_memcpy_issue_pending(ioat); | |
261 | spin_unlock_bh(&ioat->desc_lock); | |
7405f74b | 262 | |
7bb67c14 SN |
263 | return cookie; |
264 | } | |
265 | ||
7bb67c14 SN |
266 | /** |
267 | * ioat_dma_alloc_descriptor - allocate and return a sw and hw descriptor pair | |
dcbc853a | 268 | * @ioat: the channel supplying the memory pool for the descriptors |
7bb67c14 SN |
269 | * @flags: allocation flags |
270 | */ | |
bc3c7025 | 271 | static struct ioat_desc_sw * |
dcbc853a | 272 | ioat_dma_alloc_descriptor(struct ioat_dma_chan *ioat, gfp_t flags) |
0bbd5f4e CL |
273 | { |
274 | struct ioat_dma_descriptor *desc; | |
275 | struct ioat_desc_sw *desc_sw; | |
8ab89567 | 276 | struct ioatdma_device *ioatdma_device; |
0bbd5f4e CL |
277 | dma_addr_t phys; |
278 | ||
dcbc853a | 279 | ioatdma_device = ioat->base.device; |
8ab89567 | 280 | desc = pci_pool_alloc(ioatdma_device->dma_pool, flags, &phys); |
0bbd5f4e CL |
281 | if (unlikely(!desc)) |
282 | return NULL; | |
283 | ||
284 | desc_sw = kzalloc(sizeof(*desc_sw), flags); | |
285 | if (unlikely(!desc_sw)) { | |
8ab89567 | 286 | pci_pool_free(ioatdma_device->dma_pool, desc, phys); |
0bbd5f4e CL |
287 | return NULL; |
288 | } | |
289 | ||
290 | memset(desc, 0, sizeof(*desc)); | |
7bb67c14 | 291 | |
ea25968a | 292 | INIT_LIST_HEAD(&desc_sw->tx_list); |
5cbafa65 DW |
293 | dma_async_tx_descriptor_init(&desc_sw->txd, &ioat->base.common); |
294 | desc_sw->txd.tx_submit = ioat1_tx_submit; | |
0bbd5f4e | 295 | desc_sw->hw = desc; |
bc3c7025 | 296 | desc_sw->txd.phys = phys; |
6df9183a | 297 | set_desc_id(desc_sw, -1); |
0bbd5f4e CL |
298 | |
299 | return desc_sw; | |
300 | } | |
301 | ||
7bb67c14 SN |
302 | static int ioat_initial_desc_count = 256; |
303 | module_param(ioat_initial_desc_count, int, 0644); | |
304 | MODULE_PARM_DESC(ioat_initial_desc_count, | |
5cbafa65 | 305 | "ioat1: initial descriptors per channel (default: 256)"); |
7bb67c14 | 306 | /** |
5cbafa65 | 307 | * ioat1_dma_alloc_chan_resources - returns the number of allocated descriptors |
7bb67c14 SN |
308 | * @chan: the channel to be filled out |
309 | */ | |
5cbafa65 | 310 | static int ioat1_dma_alloc_chan_resources(struct dma_chan *c) |
0bbd5f4e | 311 | { |
dcbc853a DW |
312 | struct ioat_dma_chan *ioat = to_ioat_chan(c); |
313 | struct ioat_chan_common *chan = &ioat->base; | |
711924b1 | 314 | struct ioat_desc_sw *desc; |
0bbd5f4e CL |
315 | u32 chanerr; |
316 | int i; | |
317 | LIST_HEAD(tmp_list); | |
318 | ||
e4223976 | 319 | /* have we already been set up? */ |
dcbc853a DW |
320 | if (!list_empty(&ioat->free_desc)) |
321 | return ioat->desccount; | |
0bbd5f4e | 322 | |
43d6e369 | 323 | /* Setup register to interrupt and write completion status on error */ |
f6ab95b5 | 324 | writew(IOAT_CHANCTRL_RUN, chan->reg_base + IOAT_CHANCTRL_OFFSET); |
0bbd5f4e | 325 | |
dcbc853a | 326 | chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET); |
0bbd5f4e | 327 | if (chanerr) { |
dcbc853a DW |
328 | dev_err(to_dev(chan), "CHANERR = %x, clearing\n", chanerr); |
329 | writel(chanerr, chan->reg_base + IOAT_CHANERR_OFFSET); | |
0bbd5f4e CL |
330 | } |
331 | ||
332 | /* Allocate descriptors */ | |
7bb67c14 | 333 | for (i = 0; i < ioat_initial_desc_count; i++) { |
dcbc853a | 334 | desc = ioat_dma_alloc_descriptor(ioat, GFP_KERNEL); |
0bbd5f4e | 335 | if (!desc) { |
dcbc853a | 336 | dev_err(to_dev(chan), "Only %d initial descriptors\n", i); |
0bbd5f4e CL |
337 | break; |
338 | } | |
6df9183a | 339 | set_desc_id(desc, i); |
0bbd5f4e CL |
340 | list_add_tail(&desc->node, &tmp_list); |
341 | } | |
dcbc853a DW |
342 | spin_lock_bh(&ioat->desc_lock); |
343 | ioat->desccount = i; | |
344 | list_splice(&tmp_list, &ioat->free_desc); | |
dcbc853a | 345 | spin_unlock_bh(&ioat->desc_lock); |
0bbd5f4e CL |
346 | |
347 | /* allocate a completion writeback area */ | |
348 | /* doing 2 32bit writes to mmio since 1 64b write doesn't work */ | |
4fb9b9e8 DW |
349 | chan->completion = pci_pool_alloc(chan->device->completion_pool, |
350 | GFP_KERNEL, &chan->completion_dma); | |
351 | memset(chan->completion, 0, sizeof(*chan->completion)); | |
352 | writel(((u64) chan->completion_dma) & 0x00000000FFFFFFFF, | |
dcbc853a | 353 | chan->reg_base + IOAT_CHANCMP_OFFSET_LOW); |
4fb9b9e8 | 354 | writel(((u64) chan->completion_dma) >> 32, |
dcbc853a DW |
355 | chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH); |
356 | ||
357 | tasklet_enable(&chan->cleanup_task); | |
5cbafa65 | 358 | ioat1_dma_start_null_desc(ioat); /* give chain to dma device */ |
6df9183a DW |
359 | dev_dbg(to_dev(chan), "%s: allocated %d descriptors\n", |
360 | __func__, ioat->desccount); | |
dcbc853a | 361 | return ioat->desccount; |
0bbd5f4e CL |
362 | } |
363 | ||
7bb67c14 | 364 | /** |
5cbafa65 | 365 | * ioat1_dma_free_chan_resources - release all the descriptors |
7bb67c14 SN |
366 | * @chan: the channel to be cleaned |
367 | */ | |
5cbafa65 | 368 | static void ioat1_dma_free_chan_resources(struct dma_chan *c) |
0bbd5f4e | 369 | { |
dcbc853a DW |
370 | struct ioat_dma_chan *ioat = to_ioat_chan(c); |
371 | struct ioat_chan_common *chan = &ioat->base; | |
372 | struct ioatdma_device *ioatdma_device = chan->device; | |
0bbd5f4e | 373 | struct ioat_desc_sw *desc, *_desc; |
0bbd5f4e CL |
374 | int in_use_descs = 0; |
375 | ||
c3d4f44f MS |
376 | /* Before freeing channel resources first check |
377 | * if they have been previously allocated for this channel. | |
378 | */ | |
dcbc853a | 379 | if (ioat->desccount == 0) |
c3d4f44f MS |
380 | return; |
381 | ||
dcbc853a | 382 | tasklet_disable(&chan->cleanup_task); |
09c8a5b8 | 383 | del_timer_sync(&chan->timer); |
5cbafa65 | 384 | ioat1_cleanup(ioat); |
0bbd5f4e | 385 | |
3e037454 SN |
386 | /* Delay 100ms after reset to allow internal DMA logic to quiesce |
387 | * before removing DMA descriptor resources. | |
388 | */ | |
7bb67c14 | 389 | writeb(IOAT_CHANCMD_RESET, |
dcbc853a | 390 | chan->reg_base + IOAT_CHANCMD_OFFSET(chan->device->version)); |
3e037454 | 391 | mdelay(100); |
0bbd5f4e | 392 | |
dcbc853a | 393 | spin_lock_bh(&ioat->desc_lock); |
6df9183a DW |
394 | list_for_each_entry_safe(desc, _desc, &ioat->used_desc, node) { |
395 | dev_dbg(to_dev(chan), "%s: freeing %d from used list\n", | |
396 | __func__, desc_id(desc)); | |
397 | dump_desc_dbg(ioat, desc); | |
5cbafa65 DW |
398 | in_use_descs++; |
399 | list_del(&desc->node); | |
400 | pci_pool_free(ioatdma_device->dma_pool, desc->hw, | |
401 | desc->txd.phys); | |
402 | kfree(desc); | |
403 | } | |
404 | list_for_each_entry_safe(desc, _desc, | |
405 | &ioat->free_desc, node) { | |
406 | list_del(&desc->node); | |
8ab89567 | 407 | pci_pool_free(ioatdma_device->dma_pool, desc->hw, |
bc3c7025 | 408 | desc->txd.phys); |
0bbd5f4e CL |
409 | kfree(desc); |
410 | } | |
dcbc853a | 411 | spin_unlock_bh(&ioat->desc_lock); |
0bbd5f4e | 412 | |
8ab89567 | 413 | pci_pool_free(ioatdma_device->completion_pool, |
4fb9b9e8 DW |
414 | chan->completion, |
415 | chan->completion_dma); | |
0bbd5f4e CL |
416 | |
417 | /* one is ok since we left it on there on purpose */ | |
418 | if (in_use_descs > 1) | |
dcbc853a | 419 | dev_err(to_dev(chan), "Freeing %d in use descriptors!\n", |
0bbd5f4e CL |
420 | in_use_descs - 1); |
421 | ||
4fb9b9e8 DW |
422 | chan->last_completion = 0; |
423 | chan->completion_dma = 0; | |
dcbc853a | 424 | ioat->pending = 0; |
dcbc853a | 425 | ioat->desccount = 0; |
3e037454 | 426 | } |
7f2b291f | 427 | |
3e037454 | 428 | /** |
dcbc853a DW |
429 | * ioat1_dma_get_next_descriptor - return the next available descriptor |
430 | * @ioat: IOAT DMA channel handle | |
3e037454 SN |
431 | * |
432 | * Gets the next descriptor from the chain, and must be called with the | |
433 | * channel's desc_lock held. Allocates more descriptors if the channel | |
434 | * has run out. | |
435 | */ | |
7f2b291f | 436 | static struct ioat_desc_sw * |
dcbc853a | 437 | ioat1_dma_get_next_descriptor(struct ioat_dma_chan *ioat) |
3e037454 | 438 | { |
711924b1 | 439 | struct ioat_desc_sw *new; |
3e037454 | 440 | |
dcbc853a DW |
441 | if (!list_empty(&ioat->free_desc)) { |
442 | new = to_ioat_desc(ioat->free_desc.next); | |
3e037454 SN |
443 | list_del(&new->node); |
444 | } else { | |
445 | /* try to get another desc */ | |
dcbc853a | 446 | new = ioat_dma_alloc_descriptor(ioat, GFP_ATOMIC); |
711924b1 | 447 | if (!new) { |
dcbc853a | 448 | dev_err(to_dev(&ioat->base), "alloc failed\n"); |
711924b1 SN |
449 | return NULL; |
450 | } | |
3e037454 | 451 | } |
6df9183a DW |
452 | dev_dbg(to_dev(&ioat->base), "%s: allocated: %d\n", |
453 | __func__, desc_id(new)); | |
3e037454 SN |
454 | prefetch(new->hw); |
455 | return new; | |
0bbd5f4e CL |
456 | } |
457 | ||
bc3c7025 | 458 | static struct dma_async_tx_descriptor * |
dcbc853a | 459 | ioat1_dma_prep_memcpy(struct dma_chan *c, dma_addr_t dma_dest, |
bc3c7025 | 460 | dma_addr_t dma_src, size_t len, unsigned long flags) |
0bbd5f4e | 461 | { |
dcbc853a | 462 | struct ioat_dma_chan *ioat = to_ioat_chan(c); |
a0587bcf DW |
463 | struct ioat_desc_sw *desc; |
464 | size_t copy; | |
465 | LIST_HEAD(chain); | |
466 | dma_addr_t src = dma_src; | |
467 | dma_addr_t dest = dma_dest; | |
468 | size_t total_len = len; | |
469 | struct ioat_dma_descriptor *hw = NULL; | |
470 | int tx_cnt = 0; | |
0bbd5f4e | 471 | |
dcbc853a | 472 | spin_lock_bh(&ioat->desc_lock); |
5cbafa65 | 473 | desc = ioat1_dma_get_next_descriptor(ioat); |
a0587bcf DW |
474 | do { |
475 | if (!desc) | |
476 | break; | |
0bbd5f4e | 477 | |
a0587bcf | 478 | tx_cnt++; |
dcbc853a | 479 | copy = min_t(size_t, len, ioat->xfercap); |
a0587bcf DW |
480 | |
481 | hw = desc->hw; | |
482 | hw->size = copy; | |
483 | hw->ctl = 0; | |
484 | hw->src_addr = src; | |
485 | hw->dst_addr = dest; | |
486 | ||
487 | list_add_tail(&desc->node, &chain); | |
488 | ||
489 | len -= copy; | |
490 | dest += copy; | |
491 | src += copy; | |
492 | if (len) { | |
493 | struct ioat_desc_sw *next; | |
494 | ||
495 | async_tx_ack(&desc->txd); | |
5cbafa65 | 496 | next = ioat1_dma_get_next_descriptor(ioat); |
a0587bcf | 497 | hw->next = next ? next->txd.phys : 0; |
6df9183a | 498 | dump_desc_dbg(ioat, desc); |
a0587bcf DW |
499 | desc = next; |
500 | } else | |
501 | hw->next = 0; | |
502 | } while (len); | |
503 | ||
504 | if (!desc) { | |
dcbc853a DW |
505 | struct ioat_chan_common *chan = &ioat->base; |
506 | ||
507 | dev_err(to_dev(chan), | |
5cbafa65 | 508 | "chan%d - get_next_desc failed\n", chan_num(chan)); |
dcbc853a DW |
509 | list_splice(&chain, &ioat->free_desc); |
510 | spin_unlock_bh(&ioat->desc_lock); | |
711924b1 | 511 | return NULL; |
09177e85 | 512 | } |
dcbc853a | 513 | spin_unlock_bh(&ioat->desc_lock); |
a0587bcf DW |
514 | |
515 | desc->txd.flags = flags; | |
a0587bcf | 516 | desc->len = total_len; |
ea25968a | 517 | list_splice(&chain, &desc->tx_list); |
a0587bcf DW |
518 | hw->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT); |
519 | hw->ctl_f.compl_write = 1; | |
ad643f54 | 520 | hw->tx_cnt = tx_cnt; |
6df9183a | 521 | dump_desc_dbg(ioat, desc); |
a0587bcf DW |
522 | |
523 | return &desc->txd; | |
0bbd5f4e CL |
524 | } |
525 | ||
aa4d72ae | 526 | static void ioat1_cleanup_event(unsigned long data) |
3e037454 | 527 | { |
aa4d72ae | 528 | struct ioat_dma_chan *ioat = to_ioat_chan((void *) data); |
f6ab95b5 | 529 | |
aa4d72ae DW |
530 | ioat1_cleanup(ioat); |
531 | writew(IOAT_CHANCTRL_RUN, ioat->base.reg_base + IOAT_CHANCTRL_OFFSET); | |
3e037454 SN |
532 | } |
533 | ||
5cbafa65 DW |
534 | void ioat_dma_unmap(struct ioat_chan_common *chan, enum dma_ctrl_flags flags, |
535 | size_t len, struct ioat_dma_descriptor *hw) | |
0bbd5f4e | 536 | { |
5cbafa65 DW |
537 | struct pci_dev *pdev = chan->device->pdev; |
538 | size_t offset = len - hw->size; | |
0bbd5f4e | 539 | |
5cbafa65 DW |
540 | if (!(flags & DMA_COMPL_SKIP_DEST_UNMAP)) |
541 | ioat_unmap(pdev, hw->dst_addr - offset, len, | |
542 | PCI_DMA_FROMDEVICE, flags, 1); | |
0bbd5f4e | 543 | |
5cbafa65 DW |
544 | if (!(flags & DMA_COMPL_SKIP_SRC_UNMAP)) |
545 | ioat_unmap(pdev, hw->src_addr - offset, len, | |
546 | PCI_DMA_TODEVICE, flags, 0); | |
547 | } | |
548 | ||
549 | unsigned long ioat_get_current_completion(struct ioat_chan_common *chan) | |
550 | { | |
551 | unsigned long phys_complete; | |
4fb9b9e8 | 552 | u64 completion; |
0bbd5f4e | 553 | |
4fb9b9e8 | 554 | completion = *chan->completion; |
09c8a5b8 | 555 | phys_complete = ioat_chansts_to_addr(completion); |
0bbd5f4e | 556 | |
6df9183a DW |
557 | dev_dbg(to_dev(chan), "%s: phys_complete: %#llx\n", __func__, |
558 | (unsigned long long) phys_complete); | |
559 | ||
09c8a5b8 DW |
560 | if (is_ioat_halted(completion)) { |
561 | u32 chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET); | |
dcbc853a | 562 | dev_err(to_dev(chan), "Channel halted, chanerr = %x\n", |
09c8a5b8 | 563 | chanerr); |
0bbd5f4e CL |
564 | |
565 | /* TODO do something to salvage the situation */ | |
566 | } | |
567 | ||
5cbafa65 DW |
568 | return phys_complete; |
569 | } | |
570 | ||
09c8a5b8 DW |
571 | bool ioat_cleanup_preamble(struct ioat_chan_common *chan, |
572 | unsigned long *phys_complete) | |
5cbafa65 | 573 | { |
09c8a5b8 DW |
574 | *phys_complete = ioat_get_current_completion(chan); |
575 | if (*phys_complete == chan->last_completion) | |
576 | return false; | |
577 | clear_bit(IOAT_COMPLETION_ACK, &chan->state); | |
578 | mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); | |
5cbafa65 | 579 | |
09c8a5b8 DW |
580 | return true; |
581 | } | |
0bbd5f4e | 582 | |
09c8a5b8 DW |
583 | static void __cleanup(struct ioat_dma_chan *ioat, unsigned long phys_complete) |
584 | { | |
585 | struct ioat_chan_common *chan = &ioat->base; | |
586 | struct list_head *_desc, *n; | |
587 | struct dma_async_tx_descriptor *tx; | |
09177e85 | 588 | |
6df9183a DW |
589 | dev_dbg(to_dev(chan), "%s: phys_complete: %lx\n", |
590 | __func__, phys_complete); | |
09c8a5b8 DW |
591 | list_for_each_safe(_desc, n, &ioat->used_desc) { |
592 | struct ioat_desc_sw *desc; | |
593 | ||
594 | prefetch(n); | |
595 | desc = list_entry(_desc, typeof(*desc), node); | |
5cbafa65 DW |
596 | tx = &desc->txd; |
597 | /* | |
598 | * Incoming DMA requests may use multiple descriptors, | |
599 | * due to exceeding xfercap, perhaps. If so, only the | |
600 | * last one will have a cookie, and require unmapping. | |
601 | */ | |
6df9183a | 602 | dump_desc_dbg(ioat, desc); |
5cbafa65 | 603 | if (tx->cookie) { |
09c8a5b8 DW |
604 | chan->completed_cookie = tx->cookie; |
605 | tx->cookie = 0; | |
5cbafa65 | 606 | ioat_dma_unmap(chan, tx->flags, desc->len, desc->hw); |
5669e31c | 607 | ioat->active -= desc->hw->tx_cnt; |
5cbafa65 DW |
608 | if (tx->callback) { |
609 | tx->callback(tx->callback_param); | |
610 | tx->callback = NULL; | |
95218430 | 611 | } |
5cbafa65 | 612 | } |
0bbd5f4e | 613 | |
5cbafa65 DW |
614 | if (tx->phys != phys_complete) { |
615 | /* | |
616 | * a completed entry, but not the last, so clean | |
617 | * up if the client is done with the descriptor | |
618 | */ | |
619 | if (async_tx_test_ack(tx)) | |
620 | list_move_tail(&desc->node, &ioat->free_desc); | |
5cbafa65 DW |
621 | } else { |
622 | /* | |
623 | * last used desc. Do not remove, so we can | |
09c8a5b8 | 624 | * append from it. |
5cbafa65 | 625 | */ |
09c8a5b8 DW |
626 | |
627 | /* if nothing else is pending, cancel the | |
628 | * completion timeout | |
629 | */ | |
630 | if (n == &ioat->used_desc) { | |
631 | dev_dbg(to_dev(chan), | |
632 | "%s cancel completion timeout\n", | |
633 | __func__); | |
634 | clear_bit(IOAT_COMPLETION_PENDING, &chan->state); | |
635 | } | |
0bbd5f4e | 636 | |
5cbafa65 | 637 | /* TODO check status bits? */ |
0bbd5f4e CL |
638 | break; |
639 | } | |
640 | } | |
641 | ||
09c8a5b8 DW |
642 | chan->last_completion = phys_complete; |
643 | } | |
644 | ||
645 | /** | |
646 | * ioat1_cleanup - cleanup up finished descriptors | |
647 | * @chan: ioat channel to be cleaned up | |
648 | * | |
649 | * To prevent lock contention we defer cleanup when the locks are | |
650 | * contended with a terminal timeout that forces cleanup and catches | |
651 | * completion notification errors. | |
652 | */ | |
653 | static void ioat1_cleanup(struct ioat_dma_chan *ioat) | |
654 | { | |
655 | struct ioat_chan_common *chan = &ioat->base; | |
656 | unsigned long phys_complete; | |
657 | ||
658 | prefetch(chan->completion); | |
659 | ||
660 | if (!spin_trylock_bh(&chan->cleanup_lock)) | |
661 | return; | |
662 | ||
663 | if (!ioat_cleanup_preamble(chan, &phys_complete)) { | |
664 | spin_unlock_bh(&chan->cleanup_lock); | |
665 | return; | |
666 | } | |
667 | ||
668 | if (!spin_trylock_bh(&ioat->desc_lock)) { | |
669 | spin_unlock_bh(&chan->cleanup_lock); | |
670 | return; | |
671 | } | |
672 | ||
673 | __cleanup(ioat, phys_complete); | |
674 | ||
dcbc853a | 675 | spin_unlock_bh(&ioat->desc_lock); |
09c8a5b8 DW |
676 | spin_unlock_bh(&chan->cleanup_lock); |
677 | } | |
0bbd5f4e | 678 | |
09c8a5b8 DW |
679 | static void ioat1_timer_event(unsigned long data) |
680 | { | |
aa4d72ae | 681 | struct ioat_dma_chan *ioat = to_ioat_chan((void *) data); |
09c8a5b8 | 682 | struct ioat_chan_common *chan = &ioat->base; |
0bbd5f4e | 683 | |
09c8a5b8 DW |
684 | dev_dbg(to_dev(chan), "%s: state: %lx\n", __func__, chan->state); |
685 | ||
686 | spin_lock_bh(&chan->cleanup_lock); | |
687 | if (test_and_clear_bit(IOAT_RESET_PENDING, &chan->state)) { | |
688 | struct ioat_desc_sw *desc; | |
689 | ||
690 | spin_lock_bh(&ioat->desc_lock); | |
691 | ||
692 | /* restart active descriptors */ | |
693 | desc = to_ioat_desc(ioat->used_desc.prev); | |
694 | ioat_set_chainaddr(ioat, desc->txd.phys); | |
695 | ioat_start(chan); | |
696 | ||
697 | ioat->pending = 0; | |
698 | set_bit(IOAT_COMPLETION_PENDING, &chan->state); | |
699 | mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); | |
700 | spin_unlock_bh(&ioat->desc_lock); | |
701 | } else if (test_bit(IOAT_COMPLETION_PENDING, &chan->state)) { | |
702 | unsigned long phys_complete; | |
703 | ||
704 | spin_lock_bh(&ioat->desc_lock); | |
705 | /* if we haven't made progress and we have already | |
706 | * acknowledged a pending completion once, then be more | |
707 | * forceful with a restart | |
708 | */ | |
709 | if (ioat_cleanup_preamble(chan, &phys_complete)) | |
710 | __cleanup(ioat, phys_complete); | |
711 | else if (test_bit(IOAT_COMPLETION_ACK, &chan->state)) | |
712 | ioat1_reset_channel(ioat); | |
713 | else { | |
714 | u64 status = ioat_chansts(chan); | |
715 | ||
716 | /* manually update the last completion address */ | |
717 | if (ioat_chansts_to_addr(status) != 0) | |
718 | *chan->completion = status; | |
719 | ||
720 | set_bit(IOAT_COMPLETION_ACK, &chan->state); | |
721 | mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); | |
722 | } | |
723 | spin_unlock_bh(&ioat->desc_lock); | |
724 | } | |
dcbc853a | 725 | spin_unlock_bh(&chan->cleanup_lock); |
0bbd5f4e CL |
726 | } |
727 | ||
aa4d72ae DW |
728 | enum dma_status |
729 | ioat_is_dma_complete(struct dma_chan *c, dma_cookie_t cookie, | |
5cbafa65 | 730 | dma_cookie_t *done, dma_cookie_t *used) |
0bbd5f4e | 731 | { |
aa4d72ae DW |
732 | struct ioat_chan_common *chan = to_chan_common(c); |
733 | struct ioatdma_device *device = chan->device; | |
0bbd5f4e | 734 | |
5cbafa65 DW |
735 | if (ioat_is_complete(c, cookie, done, used) == DMA_SUCCESS) |
736 | return DMA_SUCCESS; | |
0bbd5f4e | 737 | |
aa4d72ae | 738 | device->cleanup_fn((unsigned long) c); |
0bbd5f4e | 739 | |
5cbafa65 | 740 | return ioat_is_complete(c, cookie, done, used); |
0bbd5f4e CL |
741 | } |
742 | ||
5cbafa65 | 743 | static void ioat1_dma_start_null_desc(struct ioat_dma_chan *ioat) |
0bbd5f4e | 744 | { |
dcbc853a | 745 | struct ioat_chan_common *chan = &ioat->base; |
0bbd5f4e | 746 | struct ioat_desc_sw *desc; |
c7984f4e | 747 | struct ioat_dma_descriptor *hw; |
0bbd5f4e | 748 | |
dcbc853a | 749 | spin_lock_bh(&ioat->desc_lock); |
0bbd5f4e | 750 | |
5cbafa65 | 751 | desc = ioat1_dma_get_next_descriptor(ioat); |
7f1b358a MS |
752 | |
753 | if (!desc) { | |
dcbc853a | 754 | dev_err(to_dev(chan), |
7f1b358a | 755 | "Unable to start null desc - get next desc failed\n"); |
dcbc853a | 756 | spin_unlock_bh(&ioat->desc_lock); |
7f1b358a MS |
757 | return; |
758 | } | |
759 | ||
c7984f4e DW |
760 | hw = desc->hw; |
761 | hw->ctl = 0; | |
762 | hw->ctl_f.null = 1; | |
763 | hw->ctl_f.int_en = 1; | |
764 | hw->ctl_f.compl_write = 1; | |
7f1b358a | 765 | /* set size to non-zero value (channel returns error when size is 0) */ |
c7984f4e DW |
766 | hw->size = NULL_DESC_BUFFER_SIZE; |
767 | hw->src_addr = 0; | |
768 | hw->dst_addr = 0; | |
bc3c7025 | 769 | async_tx_ack(&desc->txd); |
5cbafa65 DW |
770 | hw->next = 0; |
771 | list_add_tail(&desc->node, &ioat->used_desc); | |
6df9183a | 772 | dump_desc_dbg(ioat, desc); |
7bb67c14 | 773 | |
09c8a5b8 DW |
774 | ioat_set_chainaddr(ioat, desc->txd.phys); |
775 | ioat_start(chan); | |
dcbc853a | 776 | spin_unlock_bh(&ioat->desc_lock); |
0bbd5f4e CL |
777 | } |
778 | ||
779 | /* | |
780 | * Perform a IOAT transaction to verify the HW works. | |
781 | */ | |
782 | #define IOAT_TEST_SIZE 2000 | |
783 | ||
345d8523 | 784 | static void __devinit ioat_dma_test_callback(void *dma_async_param) |
95218430 | 785 | { |
b9bdcbba DW |
786 | struct completion *cmp = dma_async_param; |
787 | ||
788 | complete(cmp); | |
95218430 SN |
789 | } |
790 | ||
3e037454 SN |
791 | /** |
792 | * ioat_dma_self_test - Perform a IOAT transaction to verify the HW works. | |
793 | * @device: device to be tested | |
794 | */ | |
9de6fc71 | 795 | int __devinit ioat_dma_self_test(struct ioatdma_device *device) |
0bbd5f4e CL |
796 | { |
797 | int i; | |
798 | u8 *src; | |
799 | u8 *dest; | |
bc3c7025 DW |
800 | struct dma_device *dma = &device->common; |
801 | struct device *dev = &device->pdev->dev; | |
0bbd5f4e | 802 | struct dma_chan *dma_chan; |
711924b1 | 803 | struct dma_async_tx_descriptor *tx; |
0036731c | 804 | dma_addr_t dma_dest, dma_src; |
0bbd5f4e CL |
805 | dma_cookie_t cookie; |
806 | int err = 0; | |
b9bdcbba | 807 | struct completion cmp; |
0c33e1ca | 808 | unsigned long tmo; |
4f005dbe | 809 | unsigned long flags; |
0bbd5f4e | 810 | |
e94b1766 | 811 | src = kzalloc(sizeof(u8) * IOAT_TEST_SIZE, GFP_KERNEL); |
0bbd5f4e CL |
812 | if (!src) |
813 | return -ENOMEM; | |
e94b1766 | 814 | dest = kzalloc(sizeof(u8) * IOAT_TEST_SIZE, GFP_KERNEL); |
0bbd5f4e CL |
815 | if (!dest) { |
816 | kfree(src); | |
817 | return -ENOMEM; | |
818 | } | |
819 | ||
820 | /* Fill in src buffer */ | |
821 | for (i = 0; i < IOAT_TEST_SIZE; i++) | |
822 | src[i] = (u8)i; | |
823 | ||
824 | /* Start copy, using first DMA channel */ | |
bc3c7025 | 825 | dma_chan = container_of(dma->channels.next, struct dma_chan, |
43d6e369 | 826 | device_node); |
bc3c7025 DW |
827 | if (dma->device_alloc_chan_resources(dma_chan) < 1) { |
828 | dev_err(dev, "selftest cannot allocate chan resource\n"); | |
0bbd5f4e CL |
829 | err = -ENODEV; |
830 | goto out; | |
831 | } | |
832 | ||
bc3c7025 DW |
833 | dma_src = dma_map_single(dev, src, IOAT_TEST_SIZE, DMA_TO_DEVICE); |
834 | dma_dest = dma_map_single(dev, dest, IOAT_TEST_SIZE, DMA_FROM_DEVICE); | |
a6a39ca1 DW |
835 | flags = DMA_COMPL_SRC_UNMAP_SINGLE | DMA_COMPL_DEST_UNMAP_SINGLE | |
836 | DMA_PREP_INTERRUPT; | |
0036731c | 837 | tx = device->common.device_prep_dma_memcpy(dma_chan, dma_dest, dma_src, |
4f005dbe | 838 | IOAT_TEST_SIZE, flags); |
5149fd01 | 839 | if (!tx) { |
bc3c7025 | 840 | dev_err(dev, "Self-test prep failed, disabling\n"); |
5149fd01 SN |
841 | err = -ENODEV; |
842 | goto free_resources; | |
843 | } | |
844 | ||
7405f74b | 845 | async_tx_ack(tx); |
b9bdcbba | 846 | init_completion(&cmp); |
95218430 | 847 | tx->callback = ioat_dma_test_callback; |
b9bdcbba | 848 | tx->callback_param = &cmp; |
7bb67c14 | 849 | cookie = tx->tx_submit(tx); |
7f2b291f | 850 | if (cookie < 0) { |
bc3c7025 | 851 | dev_err(dev, "Self-test setup failed, disabling\n"); |
7f2b291f SN |
852 | err = -ENODEV; |
853 | goto free_resources; | |
854 | } | |
bc3c7025 | 855 | dma->device_issue_pending(dma_chan); |
532d3b1f | 856 | |
0c33e1ca | 857 | tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)); |
0bbd5f4e | 858 | |
0c33e1ca | 859 | if (tmo == 0 || |
bc3c7025 | 860 | dma->device_is_tx_complete(dma_chan, cookie, NULL, NULL) |
7bb67c14 | 861 | != DMA_SUCCESS) { |
bc3c7025 | 862 | dev_err(dev, "Self-test copy timed out, disabling\n"); |
0bbd5f4e CL |
863 | err = -ENODEV; |
864 | goto free_resources; | |
865 | } | |
866 | if (memcmp(src, dest, IOAT_TEST_SIZE)) { | |
bc3c7025 | 867 | dev_err(dev, "Self-test copy failed compare, disabling\n"); |
0bbd5f4e CL |
868 | err = -ENODEV; |
869 | goto free_resources; | |
870 | } | |
871 | ||
872 | free_resources: | |
bc3c7025 | 873 | dma->device_free_chan_resources(dma_chan); |
0bbd5f4e CL |
874 | out: |
875 | kfree(src); | |
876 | kfree(dest); | |
877 | return err; | |
878 | } | |
879 | ||
3e037454 SN |
880 | static char ioat_interrupt_style[32] = "msix"; |
881 | module_param_string(ioat_interrupt_style, ioat_interrupt_style, | |
882 | sizeof(ioat_interrupt_style), 0644); | |
883 | MODULE_PARM_DESC(ioat_interrupt_style, | |
884 | "set ioat interrupt style: msix (default), " | |
885 | "msix-single-vector, msi, intx)"); | |
886 | ||
887 | /** | |
888 | * ioat_dma_setup_interrupts - setup interrupt handler | |
889 | * @device: ioat device | |
890 | */ | |
891 | static int ioat_dma_setup_interrupts(struct ioatdma_device *device) | |
892 | { | |
dcbc853a | 893 | struct ioat_chan_common *chan; |
e6c0b69a DW |
894 | struct pci_dev *pdev = device->pdev; |
895 | struct device *dev = &pdev->dev; | |
896 | struct msix_entry *msix; | |
897 | int i, j, msixcnt; | |
898 | int err = -EINVAL; | |
3e037454 SN |
899 | u8 intrctrl = 0; |
900 | ||
901 | if (!strcmp(ioat_interrupt_style, "msix")) | |
902 | goto msix; | |
903 | if (!strcmp(ioat_interrupt_style, "msix-single-vector")) | |
904 | goto msix_single_vector; | |
905 | if (!strcmp(ioat_interrupt_style, "msi")) | |
906 | goto msi; | |
907 | if (!strcmp(ioat_interrupt_style, "intx")) | |
908 | goto intx; | |
e6c0b69a | 909 | dev_err(dev, "invalid ioat_interrupt_style %s\n", ioat_interrupt_style); |
5149fd01 | 910 | goto err_no_irq; |
3e037454 SN |
911 | |
912 | msix: | |
913 | /* The number of MSI-X vectors should equal the number of channels */ | |
914 | msixcnt = device->common.chancnt; | |
915 | for (i = 0; i < msixcnt; i++) | |
916 | device->msix_entries[i].entry = i; | |
917 | ||
e6c0b69a | 918 | err = pci_enable_msix(pdev, device->msix_entries, msixcnt); |
3e037454 SN |
919 | if (err < 0) |
920 | goto msi; | |
921 | if (err > 0) | |
922 | goto msix_single_vector; | |
923 | ||
924 | for (i = 0; i < msixcnt; i++) { | |
e6c0b69a | 925 | msix = &device->msix_entries[i]; |
dcbc853a | 926 | chan = ioat_chan_by_index(device, i); |
e6c0b69a DW |
927 | err = devm_request_irq(dev, msix->vector, |
928 | ioat_dma_do_interrupt_msix, 0, | |
dcbc853a | 929 | "ioat-msix", chan); |
3e037454 SN |
930 | if (err) { |
931 | for (j = 0; j < i; j++) { | |
e6c0b69a | 932 | msix = &device->msix_entries[j]; |
dcbc853a DW |
933 | chan = ioat_chan_by_index(device, j); |
934 | devm_free_irq(dev, msix->vector, chan); | |
3e037454 SN |
935 | } |
936 | goto msix_single_vector; | |
937 | } | |
938 | } | |
939 | intrctrl |= IOAT_INTRCTRL_MSIX_VECTOR_CONTROL; | |
3e037454 SN |
940 | goto done; |
941 | ||
942 | msix_single_vector: | |
e6c0b69a DW |
943 | msix = &device->msix_entries[0]; |
944 | msix->entry = 0; | |
945 | err = pci_enable_msix(pdev, device->msix_entries, 1); | |
3e037454 SN |
946 | if (err) |
947 | goto msi; | |
948 | ||
e6c0b69a DW |
949 | err = devm_request_irq(dev, msix->vector, ioat_dma_do_interrupt, 0, |
950 | "ioat-msix", device); | |
3e037454 | 951 | if (err) { |
e6c0b69a | 952 | pci_disable_msix(pdev); |
3e037454 SN |
953 | goto msi; |
954 | } | |
3e037454 SN |
955 | goto done; |
956 | ||
957 | msi: | |
e6c0b69a | 958 | err = pci_enable_msi(pdev); |
3e037454 SN |
959 | if (err) |
960 | goto intx; | |
961 | ||
e6c0b69a DW |
962 | err = devm_request_irq(dev, pdev->irq, ioat_dma_do_interrupt, 0, |
963 | "ioat-msi", device); | |
3e037454 | 964 | if (err) { |
e6c0b69a | 965 | pci_disable_msi(pdev); |
3e037454 SN |
966 | goto intx; |
967 | } | |
3e037454 SN |
968 | goto done; |
969 | ||
970 | intx: | |
e6c0b69a DW |
971 | err = devm_request_irq(dev, pdev->irq, ioat_dma_do_interrupt, |
972 | IRQF_SHARED, "ioat-intx", device); | |
3e037454 SN |
973 | if (err) |
974 | goto err_no_irq; | |
3e037454 SN |
975 | |
976 | done: | |
f2427e27 DW |
977 | if (device->intr_quirk) |
978 | device->intr_quirk(device); | |
3e037454 SN |
979 | intrctrl |= IOAT_INTRCTRL_MASTER_INT_EN; |
980 | writeb(intrctrl, device->reg_base + IOAT_INTRCTRL_OFFSET); | |
981 | return 0; | |
982 | ||
983 | err_no_irq: | |
984 | /* Disable all interrupt generation */ | |
985 | writeb(0, device->reg_base + IOAT_INTRCTRL_OFFSET); | |
e6c0b69a DW |
986 | dev_err(dev, "no usable interrupts\n"); |
987 | return err; | |
3e037454 SN |
988 | } |
989 | ||
e6c0b69a | 990 | static void ioat_disable_interrupts(struct ioatdma_device *device) |
3e037454 | 991 | { |
3e037454 SN |
992 | /* Disable all interrupt generation */ |
993 | writeb(0, device->reg_base + IOAT_INTRCTRL_OFFSET); | |
3e037454 SN |
994 | } |
995 | ||
345d8523 | 996 | int __devinit ioat_probe(struct ioatdma_device *device) |
0bbd5f4e | 997 | { |
f2427e27 DW |
998 | int err = -ENODEV; |
999 | struct dma_device *dma = &device->common; | |
1000 | struct pci_dev *pdev = device->pdev; | |
e6c0b69a | 1001 | struct device *dev = &pdev->dev; |
0bbd5f4e CL |
1002 | |
1003 | /* DMA coherent memory pool for DMA descriptor allocations */ | |
1004 | device->dma_pool = pci_pool_create("dma_desc_pool", pdev, | |
8ab89567 SN |
1005 | sizeof(struct ioat_dma_descriptor), |
1006 | 64, 0); | |
0bbd5f4e CL |
1007 | if (!device->dma_pool) { |
1008 | err = -ENOMEM; | |
1009 | goto err_dma_pool; | |
1010 | } | |
1011 | ||
43d6e369 SN |
1012 | device->completion_pool = pci_pool_create("completion_pool", pdev, |
1013 | sizeof(u64), SMP_CACHE_BYTES, | |
1014 | SMP_CACHE_BYTES); | |
5cbafa65 | 1015 | |
0bbd5f4e CL |
1016 | if (!device->completion_pool) { |
1017 | err = -ENOMEM; | |
1018 | goto err_completion_pool; | |
1019 | } | |
1020 | ||
5cbafa65 | 1021 | device->enumerate_channels(device); |
0bbd5f4e | 1022 | |
f2427e27 | 1023 | dma_cap_set(DMA_MEMCPY, dma->cap_mask); |
f2427e27 | 1024 | dma->dev = &pdev->dev; |
7bb67c14 | 1025 | |
bc3c7025 | 1026 | if (!dma->chancnt) { |
a6d52d70 | 1027 | dev_err(dev, "channel enumeration error\n"); |
8b794b14 MS |
1028 | goto err_setup_interrupts; |
1029 | } | |
1030 | ||
3e037454 | 1031 | err = ioat_dma_setup_interrupts(device); |
8ab89567 | 1032 | if (err) |
3e037454 | 1033 | goto err_setup_interrupts; |
0bbd5f4e | 1034 | |
9de6fc71 | 1035 | err = device->self_test(device); |
0bbd5f4e CL |
1036 | if (err) |
1037 | goto err_self_test; | |
1038 | ||
f2427e27 | 1039 | return 0; |
0bbd5f4e CL |
1040 | |
1041 | err_self_test: | |
e6c0b69a | 1042 | ioat_disable_interrupts(device); |
3e037454 | 1043 | err_setup_interrupts: |
0bbd5f4e CL |
1044 | pci_pool_destroy(device->completion_pool); |
1045 | err_completion_pool: | |
1046 | pci_pool_destroy(device->dma_pool); | |
1047 | err_dma_pool: | |
f2427e27 DW |
1048 | return err; |
1049 | } | |
1050 | ||
345d8523 | 1051 | int __devinit ioat_register(struct ioatdma_device *device) |
f2427e27 DW |
1052 | { |
1053 | int err = dma_async_device_register(&device->common); | |
1054 | ||
1055 | if (err) { | |
1056 | ioat_disable_interrupts(device); | |
1057 | pci_pool_destroy(device->completion_pool); | |
1058 | pci_pool_destroy(device->dma_pool); | |
1059 | } | |
1060 | ||
1061 | return err; | |
1062 | } | |
1063 | ||
1064 | /* ioat1_intr_quirk - fix up dma ctrl register to enable / disable msi */ | |
1065 | static void ioat1_intr_quirk(struct ioatdma_device *device) | |
1066 | { | |
1067 | struct pci_dev *pdev = device->pdev; | |
1068 | u32 dmactrl; | |
1069 | ||
1070 | pci_read_config_dword(pdev, IOAT_PCI_DMACTRL_OFFSET, &dmactrl); | |
1071 | if (pdev->msi_enabled) | |
1072 | dmactrl |= IOAT_PCI_DMACTRL_MSI_EN; | |
1073 | else | |
1074 | dmactrl &= ~IOAT_PCI_DMACTRL_MSI_EN; | |
1075 | pci_write_config_dword(pdev, IOAT_PCI_DMACTRL_OFFSET, dmactrl); | |
1076 | } | |
1077 | ||
5669e31c DW |
1078 | static ssize_t ring_size_show(struct dma_chan *c, char *page) |
1079 | { | |
1080 | struct ioat_dma_chan *ioat = to_ioat_chan(c); | |
1081 | ||
1082 | return sprintf(page, "%d\n", ioat->desccount); | |
1083 | } | |
1084 | static struct ioat_sysfs_entry ring_size_attr = __ATTR_RO(ring_size); | |
1085 | ||
1086 | static ssize_t ring_active_show(struct dma_chan *c, char *page) | |
1087 | { | |
1088 | struct ioat_dma_chan *ioat = to_ioat_chan(c); | |
1089 | ||
1090 | return sprintf(page, "%d\n", ioat->active); | |
1091 | } | |
1092 | static struct ioat_sysfs_entry ring_active_attr = __ATTR_RO(ring_active); | |
1093 | ||
1094 | static ssize_t cap_show(struct dma_chan *c, char *page) | |
1095 | { | |
1096 | struct dma_device *dma = c->device; | |
1097 | ||
1098 | return sprintf(page, "copy%s%s%s%s%s%s\n", | |
1099 | dma_has_cap(DMA_PQ, dma->cap_mask) ? " pq" : "", | |
1100 | dma_has_cap(DMA_PQ_VAL, dma->cap_mask) ? " pq_val" : "", | |
1101 | dma_has_cap(DMA_XOR, dma->cap_mask) ? " xor" : "", | |
1102 | dma_has_cap(DMA_XOR_VAL, dma->cap_mask) ? " xor_val" : "", | |
1103 | dma_has_cap(DMA_MEMSET, dma->cap_mask) ? " fill" : "", | |
1104 | dma_has_cap(DMA_INTERRUPT, dma->cap_mask) ? " intr" : ""); | |
1105 | ||
1106 | } | |
1107 | struct ioat_sysfs_entry ioat_cap_attr = __ATTR_RO(cap); | |
1108 | ||
1109 | static ssize_t version_show(struct dma_chan *c, char *page) | |
1110 | { | |
1111 | struct dma_device *dma = c->device; | |
1112 | struct ioatdma_device *device = to_ioatdma_device(dma); | |
1113 | ||
1114 | return sprintf(page, "%d.%d\n", | |
1115 | device->version >> 4, device->version & 0xf); | |
1116 | } | |
1117 | struct ioat_sysfs_entry ioat_version_attr = __ATTR_RO(version); | |
1118 | ||
1119 | static struct attribute *ioat1_attrs[] = { | |
1120 | &ring_size_attr.attr, | |
1121 | &ring_active_attr.attr, | |
1122 | &ioat_cap_attr.attr, | |
1123 | &ioat_version_attr.attr, | |
1124 | NULL, | |
1125 | }; | |
1126 | ||
1127 | static ssize_t | |
1128 | ioat_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
1129 | { | |
1130 | struct ioat_sysfs_entry *entry; | |
1131 | struct ioat_chan_common *chan; | |
1132 | ||
1133 | entry = container_of(attr, struct ioat_sysfs_entry, attr); | |
1134 | chan = container_of(kobj, struct ioat_chan_common, kobj); | |
1135 | ||
1136 | if (!entry->show) | |
1137 | return -EIO; | |
1138 | return entry->show(&chan->common, page); | |
1139 | } | |
1140 | ||
52cf25d0 | 1141 | const struct sysfs_ops ioat_sysfs_ops = { |
5669e31c DW |
1142 | .show = ioat_attr_show, |
1143 | }; | |
1144 | ||
1145 | static struct kobj_type ioat1_ktype = { | |
1146 | .sysfs_ops = &ioat_sysfs_ops, | |
1147 | .default_attrs = ioat1_attrs, | |
1148 | }; | |
1149 | ||
1150 | void ioat_kobject_add(struct ioatdma_device *device, struct kobj_type *type) | |
1151 | { | |
1152 | struct dma_device *dma = &device->common; | |
1153 | struct dma_chan *c; | |
1154 | ||
1155 | list_for_each_entry(c, &dma->channels, device_node) { | |
1156 | struct ioat_chan_common *chan = to_chan_common(c); | |
1157 | struct kobject *parent = &c->dev->device.kobj; | |
1158 | int err; | |
1159 | ||
1160 | err = kobject_init_and_add(&chan->kobj, type, parent, "quickdata"); | |
1161 | if (err) { | |
1162 | dev_warn(to_dev(chan), | |
1163 | "sysfs init error (%d), continuing...\n", err); | |
1164 | kobject_put(&chan->kobj); | |
1165 | set_bit(IOAT_KOBJ_INIT_FAIL, &chan->state); | |
1166 | } | |
1167 | } | |
1168 | } | |
1169 | ||
1170 | void ioat_kobject_del(struct ioatdma_device *device) | |
1171 | { | |
1172 | struct dma_device *dma = &device->common; | |
1173 | struct dma_chan *c; | |
1174 | ||
1175 | list_for_each_entry(c, &dma->channels, device_node) { | |
1176 | struct ioat_chan_common *chan = to_chan_common(c); | |
1177 | ||
1178 | if (!test_bit(IOAT_KOBJ_INIT_FAIL, &chan->state)) { | |
1179 | kobject_del(&chan->kobj); | |
1180 | kobject_put(&chan->kobj); | |
1181 | } | |
1182 | } | |
1183 | } | |
1184 | ||
345d8523 | 1185 | int __devinit ioat1_dma_probe(struct ioatdma_device *device, int dca) |
f2427e27 DW |
1186 | { |
1187 | struct pci_dev *pdev = device->pdev; | |
1188 | struct dma_device *dma; | |
1189 | int err; | |
1190 | ||
1191 | device->intr_quirk = ioat1_intr_quirk; | |
5cbafa65 | 1192 | device->enumerate_channels = ioat1_enumerate_channels; |
9de6fc71 | 1193 | device->self_test = ioat_dma_self_test; |
aa4d72ae DW |
1194 | device->timer_fn = ioat1_timer_event; |
1195 | device->cleanup_fn = ioat1_cleanup_event; | |
f2427e27 DW |
1196 | dma = &device->common; |
1197 | dma->device_prep_dma_memcpy = ioat1_dma_prep_memcpy; | |
1198 | dma->device_issue_pending = ioat1_dma_memcpy_issue_pending; | |
5cbafa65 DW |
1199 | dma->device_alloc_chan_resources = ioat1_dma_alloc_chan_resources; |
1200 | dma->device_free_chan_resources = ioat1_dma_free_chan_resources; | |
aa4d72ae | 1201 | dma->device_is_tx_complete = ioat_is_dma_complete; |
f2427e27 DW |
1202 | |
1203 | err = ioat_probe(device); | |
1204 | if (err) | |
1205 | return err; | |
1206 | ioat_set_tcp_copy_break(4096); | |
1207 | err = ioat_register(device); | |
1208 | if (err) | |
1209 | return err; | |
5669e31c DW |
1210 | ioat_kobject_add(device, &ioat1_ktype); |
1211 | ||
f2427e27 DW |
1212 | if (dca) |
1213 | device->dca = ioat_dca_init(pdev, device->reg_base); | |
1214 | ||
f2427e27 DW |
1215 | return err; |
1216 | } | |
1217 | ||
345d8523 | 1218 | void __devexit ioat_dma_remove(struct ioatdma_device *device) |
0bbd5f4e | 1219 | { |
bc3c7025 | 1220 | struct dma_device *dma = &device->common; |
0bbd5f4e | 1221 | |
e6c0b69a | 1222 | ioat_disable_interrupts(device); |
8ab89567 | 1223 | |
5669e31c DW |
1224 | ioat_kobject_del(device); |
1225 | ||
bc3c7025 | 1226 | dma_async_device_unregister(dma); |
dfe2299e | 1227 | |
0bbd5f4e CL |
1228 | pci_pool_destroy(device->dma_pool); |
1229 | pci_pool_destroy(device->completion_pool); | |
8ab89567 | 1230 | |
dcbc853a | 1231 | INIT_LIST_HEAD(&dma->channels); |
0bbd5f4e | 1232 | } |