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[mirror_ubuntu-kernels.git] / drivers / dma / ioat / init.c
1 /*
2 * Intel I/OAT DMA Linux driver
3 * Copyright(c) 2004 - 2015 Intel Corporation.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * The full GNU General Public License is included in this distribution in
15 * the file called "COPYING".
16 *
17 */
18
19 #include <linux/init.h>
20 #include <linux/module.h>
21 #include <linux/slab.h>
22 #include <linux/pci.h>
23 #include <linux/interrupt.h>
24 #include <linux/dmaengine.h>
25 #include <linux/delay.h>
26 #include <linux/dma-mapping.h>
27 #include <linux/workqueue.h>
28 #include <linux/prefetch.h>
29 #include <linux/dca.h>
30 #include <linux/aer.h>
31 #include <linux/sizes.h>
32 #include "dma.h"
33 #include "registers.h"
34 #include "hw.h"
35
36 #include "../dmaengine.h"
37
38 MODULE_VERSION(IOAT_DMA_VERSION);
39 MODULE_LICENSE("Dual BSD/GPL");
40 MODULE_AUTHOR("Intel Corporation");
41
42 static const struct pci_device_id ioat_pci_tbl[] = {
43 /* I/OAT v3 platforms */
44 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG0) },
45 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG1) },
46 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG2) },
47 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG3) },
48 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG4) },
49 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG5) },
50 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG6) },
51 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG7) },
52
53 /* I/OAT v3.2 platforms */
54 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF0) },
55 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF1) },
56 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF2) },
57 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF3) },
58 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF4) },
59 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF5) },
60 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF6) },
61 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF7) },
62 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF8) },
63 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF9) },
64
65 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB0) },
66 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB1) },
67 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB2) },
68 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB3) },
69 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB4) },
70 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB5) },
71 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB6) },
72 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB7) },
73 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB8) },
74 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB9) },
75
76 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB0) },
77 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB1) },
78 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB2) },
79 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB3) },
80 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB4) },
81 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB5) },
82 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB6) },
83 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB7) },
84 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB8) },
85 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB9) },
86
87 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW0) },
88 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW1) },
89 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW2) },
90 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW3) },
91 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW4) },
92 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW5) },
93 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW6) },
94 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW7) },
95 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW8) },
96 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW9) },
97
98 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX0) },
99 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX1) },
100 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX2) },
101 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX3) },
102 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX4) },
103 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX5) },
104 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX6) },
105 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX7) },
106 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX8) },
107 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX9) },
108
109 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SKX) },
110
111 /* I/OAT v3.3 platforms */
112 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD0) },
113 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD1) },
114 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD2) },
115 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD3) },
116
117 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE0) },
118 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE1) },
119 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE2) },
120 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE3) },
121
122 { 0, }
123 };
124 MODULE_DEVICE_TABLE(pci, ioat_pci_tbl);
125
126 static int ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id);
127 static void ioat_remove(struct pci_dev *pdev);
128 static void
129 ioat_init_channel(struct ioatdma_device *ioat_dma,
130 struct ioatdma_chan *ioat_chan, int idx);
131 static void ioat_intr_quirk(struct ioatdma_device *ioat_dma);
132 static void ioat_enumerate_channels(struct ioatdma_device *ioat_dma);
133 static int ioat3_dma_self_test(struct ioatdma_device *ioat_dma);
134
135 static int ioat_dca_enabled = 1;
136 module_param(ioat_dca_enabled, int, 0644);
137 MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)");
138 int ioat_pending_level = 4;
139 module_param(ioat_pending_level, int, 0644);
140 MODULE_PARM_DESC(ioat_pending_level,
141 "high-water mark for pushing ioat descriptors (default: 4)");
142 static char ioat_interrupt_style[32] = "msix";
143 module_param_string(ioat_interrupt_style, ioat_interrupt_style,
144 sizeof(ioat_interrupt_style), 0644);
145 MODULE_PARM_DESC(ioat_interrupt_style,
146 "set ioat interrupt style: msix (default), msi, intx");
147
148 struct kmem_cache *ioat_cache;
149 struct kmem_cache *ioat_sed_cache;
150
151 static bool is_jf_ioat(struct pci_dev *pdev)
152 {
153 switch (pdev->device) {
154 case PCI_DEVICE_ID_INTEL_IOAT_JSF0:
155 case PCI_DEVICE_ID_INTEL_IOAT_JSF1:
156 case PCI_DEVICE_ID_INTEL_IOAT_JSF2:
157 case PCI_DEVICE_ID_INTEL_IOAT_JSF3:
158 case PCI_DEVICE_ID_INTEL_IOAT_JSF4:
159 case PCI_DEVICE_ID_INTEL_IOAT_JSF5:
160 case PCI_DEVICE_ID_INTEL_IOAT_JSF6:
161 case PCI_DEVICE_ID_INTEL_IOAT_JSF7:
162 case PCI_DEVICE_ID_INTEL_IOAT_JSF8:
163 case PCI_DEVICE_ID_INTEL_IOAT_JSF9:
164 return true;
165 default:
166 return false;
167 }
168 }
169
170 static bool is_snb_ioat(struct pci_dev *pdev)
171 {
172 switch (pdev->device) {
173 case PCI_DEVICE_ID_INTEL_IOAT_SNB0:
174 case PCI_DEVICE_ID_INTEL_IOAT_SNB1:
175 case PCI_DEVICE_ID_INTEL_IOAT_SNB2:
176 case PCI_DEVICE_ID_INTEL_IOAT_SNB3:
177 case PCI_DEVICE_ID_INTEL_IOAT_SNB4:
178 case PCI_DEVICE_ID_INTEL_IOAT_SNB5:
179 case PCI_DEVICE_ID_INTEL_IOAT_SNB6:
180 case PCI_DEVICE_ID_INTEL_IOAT_SNB7:
181 case PCI_DEVICE_ID_INTEL_IOAT_SNB8:
182 case PCI_DEVICE_ID_INTEL_IOAT_SNB9:
183 return true;
184 default:
185 return false;
186 }
187 }
188
189 static bool is_ivb_ioat(struct pci_dev *pdev)
190 {
191 switch (pdev->device) {
192 case PCI_DEVICE_ID_INTEL_IOAT_IVB0:
193 case PCI_DEVICE_ID_INTEL_IOAT_IVB1:
194 case PCI_DEVICE_ID_INTEL_IOAT_IVB2:
195 case PCI_DEVICE_ID_INTEL_IOAT_IVB3:
196 case PCI_DEVICE_ID_INTEL_IOAT_IVB4:
197 case PCI_DEVICE_ID_INTEL_IOAT_IVB5:
198 case PCI_DEVICE_ID_INTEL_IOAT_IVB6:
199 case PCI_DEVICE_ID_INTEL_IOAT_IVB7:
200 case PCI_DEVICE_ID_INTEL_IOAT_IVB8:
201 case PCI_DEVICE_ID_INTEL_IOAT_IVB9:
202 return true;
203 default:
204 return false;
205 }
206
207 }
208
209 static bool is_hsw_ioat(struct pci_dev *pdev)
210 {
211 switch (pdev->device) {
212 case PCI_DEVICE_ID_INTEL_IOAT_HSW0:
213 case PCI_DEVICE_ID_INTEL_IOAT_HSW1:
214 case PCI_DEVICE_ID_INTEL_IOAT_HSW2:
215 case PCI_DEVICE_ID_INTEL_IOAT_HSW3:
216 case PCI_DEVICE_ID_INTEL_IOAT_HSW4:
217 case PCI_DEVICE_ID_INTEL_IOAT_HSW5:
218 case PCI_DEVICE_ID_INTEL_IOAT_HSW6:
219 case PCI_DEVICE_ID_INTEL_IOAT_HSW7:
220 case PCI_DEVICE_ID_INTEL_IOAT_HSW8:
221 case PCI_DEVICE_ID_INTEL_IOAT_HSW9:
222 return true;
223 default:
224 return false;
225 }
226
227 }
228
229 static bool is_bdx_ioat(struct pci_dev *pdev)
230 {
231 switch (pdev->device) {
232 case PCI_DEVICE_ID_INTEL_IOAT_BDX0:
233 case PCI_DEVICE_ID_INTEL_IOAT_BDX1:
234 case PCI_DEVICE_ID_INTEL_IOAT_BDX2:
235 case PCI_DEVICE_ID_INTEL_IOAT_BDX3:
236 case PCI_DEVICE_ID_INTEL_IOAT_BDX4:
237 case PCI_DEVICE_ID_INTEL_IOAT_BDX5:
238 case PCI_DEVICE_ID_INTEL_IOAT_BDX6:
239 case PCI_DEVICE_ID_INTEL_IOAT_BDX7:
240 case PCI_DEVICE_ID_INTEL_IOAT_BDX8:
241 case PCI_DEVICE_ID_INTEL_IOAT_BDX9:
242 return true;
243 default:
244 return false;
245 }
246 }
247
248 static inline bool is_skx_ioat(struct pci_dev *pdev)
249 {
250 return (pdev->device == PCI_DEVICE_ID_INTEL_IOAT_SKX) ? true : false;
251 }
252
253 static bool is_xeon_cb32(struct pci_dev *pdev)
254 {
255 return is_jf_ioat(pdev) || is_snb_ioat(pdev) || is_ivb_ioat(pdev) ||
256 is_hsw_ioat(pdev) || is_bdx_ioat(pdev) || is_skx_ioat(pdev);
257 }
258
259 bool is_bwd_ioat(struct pci_dev *pdev)
260 {
261 switch (pdev->device) {
262 case PCI_DEVICE_ID_INTEL_IOAT_BWD0:
263 case PCI_DEVICE_ID_INTEL_IOAT_BWD1:
264 case PCI_DEVICE_ID_INTEL_IOAT_BWD2:
265 case PCI_DEVICE_ID_INTEL_IOAT_BWD3:
266 /* even though not Atom, BDX-DE has same DMA silicon */
267 case PCI_DEVICE_ID_INTEL_IOAT_BDXDE0:
268 case PCI_DEVICE_ID_INTEL_IOAT_BDXDE1:
269 case PCI_DEVICE_ID_INTEL_IOAT_BDXDE2:
270 case PCI_DEVICE_ID_INTEL_IOAT_BDXDE3:
271 return true;
272 default:
273 return false;
274 }
275 }
276
277 static bool is_bwd_noraid(struct pci_dev *pdev)
278 {
279 switch (pdev->device) {
280 case PCI_DEVICE_ID_INTEL_IOAT_BWD2:
281 case PCI_DEVICE_ID_INTEL_IOAT_BWD3:
282 case PCI_DEVICE_ID_INTEL_IOAT_BDXDE0:
283 case PCI_DEVICE_ID_INTEL_IOAT_BDXDE1:
284 case PCI_DEVICE_ID_INTEL_IOAT_BDXDE2:
285 case PCI_DEVICE_ID_INTEL_IOAT_BDXDE3:
286 return true;
287 default:
288 return false;
289 }
290
291 }
292
293 /*
294 * Perform a IOAT transaction to verify the HW works.
295 */
296 #define IOAT_TEST_SIZE 2000
297
298 static void ioat_dma_test_callback(void *dma_async_param)
299 {
300 struct completion *cmp = dma_async_param;
301
302 complete(cmp);
303 }
304
305 /**
306 * ioat_dma_self_test - Perform a IOAT transaction to verify the HW works.
307 * @ioat_dma: dma device to be tested
308 */
309 static int ioat_dma_self_test(struct ioatdma_device *ioat_dma)
310 {
311 int i;
312 u8 *src;
313 u8 *dest;
314 struct dma_device *dma = &ioat_dma->dma_dev;
315 struct device *dev = &ioat_dma->pdev->dev;
316 struct dma_chan *dma_chan;
317 struct dma_async_tx_descriptor *tx;
318 dma_addr_t dma_dest, dma_src;
319 dma_cookie_t cookie;
320 int err = 0;
321 struct completion cmp;
322 unsigned long tmo;
323 unsigned long flags;
324
325 src = kzalloc(IOAT_TEST_SIZE, GFP_KERNEL);
326 if (!src)
327 return -ENOMEM;
328 dest = kzalloc(IOAT_TEST_SIZE, GFP_KERNEL);
329 if (!dest) {
330 kfree(src);
331 return -ENOMEM;
332 }
333
334 /* Fill in src buffer */
335 for (i = 0; i < IOAT_TEST_SIZE; i++)
336 src[i] = (u8)i;
337
338 /* Start copy, using first DMA channel */
339 dma_chan = container_of(dma->channels.next, struct dma_chan,
340 device_node);
341 if (dma->device_alloc_chan_resources(dma_chan) < 1) {
342 dev_err(dev, "selftest cannot allocate chan resource\n");
343 err = -ENODEV;
344 goto out;
345 }
346
347 dma_src = dma_map_single(dev, src, IOAT_TEST_SIZE, DMA_TO_DEVICE);
348 if (dma_mapping_error(dev, dma_src)) {
349 dev_err(dev, "mapping src buffer failed\n");
350 err = -ENOMEM;
351 goto free_resources;
352 }
353 dma_dest = dma_map_single(dev, dest, IOAT_TEST_SIZE, DMA_FROM_DEVICE);
354 if (dma_mapping_error(dev, dma_dest)) {
355 dev_err(dev, "mapping dest buffer failed\n");
356 err = -ENOMEM;
357 goto unmap_src;
358 }
359 flags = DMA_PREP_INTERRUPT;
360 tx = ioat_dma->dma_dev.device_prep_dma_memcpy(dma_chan, dma_dest,
361 dma_src, IOAT_TEST_SIZE,
362 flags);
363 if (!tx) {
364 dev_err(dev, "Self-test prep failed, disabling\n");
365 err = -ENODEV;
366 goto unmap_dma;
367 }
368
369 async_tx_ack(tx);
370 init_completion(&cmp);
371 tx->callback = ioat_dma_test_callback;
372 tx->callback_param = &cmp;
373 cookie = tx->tx_submit(tx);
374 if (cookie < 0) {
375 dev_err(dev, "Self-test setup failed, disabling\n");
376 err = -ENODEV;
377 goto unmap_dma;
378 }
379 dma->device_issue_pending(dma_chan);
380
381 tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
382
383 if (tmo == 0 ||
384 dma->device_tx_status(dma_chan, cookie, NULL)
385 != DMA_COMPLETE) {
386 dev_err(dev, "Self-test copy timed out, disabling\n");
387 err = -ENODEV;
388 goto unmap_dma;
389 }
390 if (memcmp(src, dest, IOAT_TEST_SIZE)) {
391 dev_err(dev, "Self-test copy failed compare, disabling\n");
392 err = -ENODEV;
393 goto unmap_dma;
394 }
395
396 unmap_dma:
397 dma_unmap_single(dev, dma_dest, IOAT_TEST_SIZE, DMA_FROM_DEVICE);
398 unmap_src:
399 dma_unmap_single(dev, dma_src, IOAT_TEST_SIZE, DMA_TO_DEVICE);
400 free_resources:
401 dma->device_free_chan_resources(dma_chan);
402 out:
403 kfree(src);
404 kfree(dest);
405 return err;
406 }
407
408 /**
409 * ioat_dma_setup_interrupts - setup interrupt handler
410 * @ioat_dma: ioat dma device
411 */
412 int ioat_dma_setup_interrupts(struct ioatdma_device *ioat_dma)
413 {
414 struct ioatdma_chan *ioat_chan;
415 struct pci_dev *pdev = ioat_dma->pdev;
416 struct device *dev = &pdev->dev;
417 struct msix_entry *msix;
418 int i, j, msixcnt;
419 int err = -EINVAL;
420 u8 intrctrl = 0;
421
422 if (!strcmp(ioat_interrupt_style, "msix"))
423 goto msix;
424 if (!strcmp(ioat_interrupt_style, "msi"))
425 goto msi;
426 if (!strcmp(ioat_interrupt_style, "intx"))
427 goto intx;
428 dev_err(dev, "invalid ioat_interrupt_style %s\n", ioat_interrupt_style);
429 goto err_no_irq;
430
431 msix:
432 /* The number of MSI-X vectors should equal the number of channels */
433 msixcnt = ioat_dma->dma_dev.chancnt;
434 for (i = 0; i < msixcnt; i++)
435 ioat_dma->msix_entries[i].entry = i;
436
437 err = pci_enable_msix_exact(pdev, ioat_dma->msix_entries, msixcnt);
438 if (err)
439 goto msi;
440
441 for (i = 0; i < msixcnt; i++) {
442 msix = &ioat_dma->msix_entries[i];
443 ioat_chan = ioat_chan_by_index(ioat_dma, i);
444 err = devm_request_irq(dev, msix->vector,
445 ioat_dma_do_interrupt_msix, 0,
446 "ioat-msix", ioat_chan);
447 if (err) {
448 for (j = 0; j < i; j++) {
449 msix = &ioat_dma->msix_entries[j];
450 ioat_chan = ioat_chan_by_index(ioat_dma, j);
451 devm_free_irq(dev, msix->vector, ioat_chan);
452 }
453 goto msi;
454 }
455 }
456 intrctrl |= IOAT_INTRCTRL_MSIX_VECTOR_CONTROL;
457 ioat_dma->irq_mode = IOAT_MSIX;
458 goto done;
459
460 msi:
461 err = pci_enable_msi(pdev);
462 if (err)
463 goto intx;
464
465 err = devm_request_irq(dev, pdev->irq, ioat_dma_do_interrupt, 0,
466 "ioat-msi", ioat_dma);
467 if (err) {
468 pci_disable_msi(pdev);
469 goto intx;
470 }
471 ioat_dma->irq_mode = IOAT_MSI;
472 goto done;
473
474 intx:
475 err = devm_request_irq(dev, pdev->irq, ioat_dma_do_interrupt,
476 IRQF_SHARED, "ioat-intx", ioat_dma);
477 if (err)
478 goto err_no_irq;
479
480 ioat_dma->irq_mode = IOAT_INTX;
481 done:
482 if (is_bwd_ioat(pdev))
483 ioat_intr_quirk(ioat_dma);
484 intrctrl |= IOAT_INTRCTRL_MASTER_INT_EN;
485 writeb(intrctrl, ioat_dma->reg_base + IOAT_INTRCTRL_OFFSET);
486 return 0;
487
488 err_no_irq:
489 /* Disable all interrupt generation */
490 writeb(0, ioat_dma->reg_base + IOAT_INTRCTRL_OFFSET);
491 ioat_dma->irq_mode = IOAT_NOIRQ;
492 dev_err(dev, "no usable interrupts\n");
493 return err;
494 }
495
496 static void ioat_disable_interrupts(struct ioatdma_device *ioat_dma)
497 {
498 /* Disable all interrupt generation */
499 writeb(0, ioat_dma->reg_base + IOAT_INTRCTRL_OFFSET);
500 }
501
502 static int ioat_probe(struct ioatdma_device *ioat_dma)
503 {
504 int err = -ENODEV;
505 struct dma_device *dma = &ioat_dma->dma_dev;
506 struct pci_dev *pdev = ioat_dma->pdev;
507 struct device *dev = &pdev->dev;
508
509 ioat_dma->completion_pool = dma_pool_create("completion_pool", dev,
510 sizeof(u64),
511 SMP_CACHE_BYTES,
512 SMP_CACHE_BYTES);
513
514 if (!ioat_dma->completion_pool) {
515 err = -ENOMEM;
516 goto err_out;
517 }
518
519 ioat_enumerate_channels(ioat_dma);
520
521 dma_cap_set(DMA_MEMCPY, dma->cap_mask);
522 dma->dev = &pdev->dev;
523
524 if (!dma->chancnt) {
525 dev_err(dev, "channel enumeration error\n");
526 goto err_setup_interrupts;
527 }
528
529 err = ioat_dma_setup_interrupts(ioat_dma);
530 if (err)
531 goto err_setup_interrupts;
532
533 err = ioat3_dma_self_test(ioat_dma);
534 if (err)
535 goto err_self_test;
536
537 return 0;
538
539 err_self_test:
540 ioat_disable_interrupts(ioat_dma);
541 err_setup_interrupts:
542 dma_pool_destroy(ioat_dma->completion_pool);
543 err_out:
544 return err;
545 }
546
547 static int ioat_register(struct ioatdma_device *ioat_dma)
548 {
549 int err = dma_async_device_register(&ioat_dma->dma_dev);
550
551 if (err) {
552 ioat_disable_interrupts(ioat_dma);
553 dma_pool_destroy(ioat_dma->completion_pool);
554 }
555
556 return err;
557 }
558
559 static void ioat_dma_remove(struct ioatdma_device *ioat_dma)
560 {
561 struct dma_device *dma = &ioat_dma->dma_dev;
562
563 ioat_disable_interrupts(ioat_dma);
564
565 ioat_kobject_del(ioat_dma);
566
567 dma_async_device_unregister(dma);
568
569 dma_pool_destroy(ioat_dma->completion_pool);
570
571 INIT_LIST_HEAD(&dma->channels);
572 }
573
574 /**
575 * ioat_enumerate_channels - find and initialize the device's channels
576 * @ioat_dma: the ioat dma device to be enumerated
577 */
578 static void ioat_enumerate_channels(struct ioatdma_device *ioat_dma)
579 {
580 struct ioatdma_chan *ioat_chan;
581 struct device *dev = &ioat_dma->pdev->dev;
582 struct dma_device *dma = &ioat_dma->dma_dev;
583 u8 xfercap_log;
584 int i;
585
586 INIT_LIST_HEAD(&dma->channels);
587 dma->chancnt = readb(ioat_dma->reg_base + IOAT_CHANCNT_OFFSET);
588 dma->chancnt &= 0x1f; /* bits [4:0] valid */
589 if (dma->chancnt > ARRAY_SIZE(ioat_dma->idx)) {
590 dev_warn(dev, "(%d) exceeds max supported channels (%zu)\n",
591 dma->chancnt, ARRAY_SIZE(ioat_dma->idx));
592 dma->chancnt = ARRAY_SIZE(ioat_dma->idx);
593 }
594 xfercap_log = readb(ioat_dma->reg_base + IOAT_XFERCAP_OFFSET);
595 xfercap_log &= 0x1f; /* bits [4:0] valid */
596 if (xfercap_log == 0)
597 return;
598 dev_dbg(dev, "%s: xfercap = %d\n", __func__, 1 << xfercap_log);
599
600 for (i = 0; i < dma->chancnt; i++) {
601 ioat_chan = devm_kzalloc(dev, sizeof(*ioat_chan), GFP_KERNEL);
602 if (!ioat_chan)
603 break;
604
605 ioat_init_channel(ioat_dma, ioat_chan, i);
606 ioat_chan->xfercap_log = xfercap_log;
607 spin_lock_init(&ioat_chan->prep_lock);
608 if (ioat_reset_hw(ioat_chan)) {
609 i = 0;
610 break;
611 }
612 }
613 dma->chancnt = i;
614 }
615
616 /**
617 * ioat_free_chan_resources - release all the descriptors
618 * @chan: the channel to be cleaned
619 */
620 static void ioat_free_chan_resources(struct dma_chan *c)
621 {
622 struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
623 struct ioatdma_device *ioat_dma = ioat_chan->ioat_dma;
624 struct ioat_ring_ent *desc;
625 const int total_descs = 1 << ioat_chan->alloc_order;
626 int descs;
627 int i;
628
629 /* Before freeing channel resources first check
630 * if they have been previously allocated for this channel.
631 */
632 if (!ioat_chan->ring)
633 return;
634
635 ioat_stop(ioat_chan);
636 ioat_reset_hw(ioat_chan);
637
638 spin_lock_bh(&ioat_chan->cleanup_lock);
639 spin_lock_bh(&ioat_chan->prep_lock);
640 descs = ioat_ring_space(ioat_chan);
641 dev_dbg(to_dev(ioat_chan), "freeing %d idle descriptors\n", descs);
642 for (i = 0; i < descs; i++) {
643 desc = ioat_get_ring_ent(ioat_chan, ioat_chan->head + i);
644 ioat_free_ring_ent(desc, c);
645 }
646
647 if (descs < total_descs)
648 dev_err(to_dev(ioat_chan), "Freeing %d in use descriptors!\n",
649 total_descs - descs);
650
651 for (i = 0; i < total_descs - descs; i++) {
652 desc = ioat_get_ring_ent(ioat_chan, ioat_chan->tail + i);
653 dump_desc_dbg(ioat_chan, desc);
654 ioat_free_ring_ent(desc, c);
655 }
656
657 for (i = 0; i < ioat_chan->desc_chunks; i++) {
658 dma_free_coherent(to_dev(ioat_chan), SZ_2M,
659 ioat_chan->descs[i].virt,
660 ioat_chan->descs[i].hw);
661 ioat_chan->descs[i].virt = NULL;
662 ioat_chan->descs[i].hw = 0;
663 }
664 ioat_chan->desc_chunks = 0;
665
666 kfree(ioat_chan->ring);
667 ioat_chan->ring = NULL;
668 ioat_chan->alloc_order = 0;
669 dma_pool_free(ioat_dma->completion_pool, ioat_chan->completion,
670 ioat_chan->completion_dma);
671 spin_unlock_bh(&ioat_chan->prep_lock);
672 spin_unlock_bh(&ioat_chan->cleanup_lock);
673
674 ioat_chan->last_completion = 0;
675 ioat_chan->completion_dma = 0;
676 ioat_chan->dmacount = 0;
677 }
678
679 /* ioat_alloc_chan_resources - allocate/initialize ioat descriptor ring
680 * @chan: channel to be initialized
681 */
682 static int ioat_alloc_chan_resources(struct dma_chan *c)
683 {
684 struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
685 struct ioat_ring_ent **ring;
686 u64 status;
687 int order;
688 int i = 0;
689 u32 chanerr;
690
691 /* have we already been set up? */
692 if (ioat_chan->ring)
693 return 1 << ioat_chan->alloc_order;
694
695 /* Setup register to interrupt and write completion status on error */
696 writew(IOAT_CHANCTRL_RUN, ioat_chan->reg_base + IOAT_CHANCTRL_OFFSET);
697
698 /* allocate a completion writeback area */
699 /* doing 2 32bit writes to mmio since 1 64b write doesn't work */
700 ioat_chan->completion =
701 dma_pool_zalloc(ioat_chan->ioat_dma->completion_pool,
702 GFP_NOWAIT, &ioat_chan->completion_dma);
703 if (!ioat_chan->completion)
704 return -ENOMEM;
705
706 writel(((u64)ioat_chan->completion_dma) & 0x00000000FFFFFFFF,
707 ioat_chan->reg_base + IOAT_CHANCMP_OFFSET_LOW);
708 writel(((u64)ioat_chan->completion_dma) >> 32,
709 ioat_chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH);
710
711 order = IOAT_MAX_ORDER;
712 ring = ioat_alloc_ring(c, order, GFP_NOWAIT);
713 if (!ring)
714 return -ENOMEM;
715
716 spin_lock_bh(&ioat_chan->cleanup_lock);
717 spin_lock_bh(&ioat_chan->prep_lock);
718 ioat_chan->ring = ring;
719 ioat_chan->head = 0;
720 ioat_chan->issued = 0;
721 ioat_chan->tail = 0;
722 ioat_chan->alloc_order = order;
723 set_bit(IOAT_RUN, &ioat_chan->state);
724 spin_unlock_bh(&ioat_chan->prep_lock);
725 spin_unlock_bh(&ioat_chan->cleanup_lock);
726
727 ioat_start_null_desc(ioat_chan);
728
729 /* check that we got off the ground */
730 do {
731 udelay(1);
732 status = ioat_chansts(ioat_chan);
733 } while (i++ < 20 && !is_ioat_active(status) && !is_ioat_idle(status));
734
735 if (is_ioat_active(status) || is_ioat_idle(status))
736 return 1 << ioat_chan->alloc_order;
737
738 chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
739
740 dev_WARN(to_dev(ioat_chan),
741 "failed to start channel chanerr: %#x\n", chanerr);
742 ioat_free_chan_resources(c);
743 return -EFAULT;
744 }
745
746 /* common channel initialization */
747 static void
748 ioat_init_channel(struct ioatdma_device *ioat_dma,
749 struct ioatdma_chan *ioat_chan, int idx)
750 {
751 struct dma_device *dma = &ioat_dma->dma_dev;
752 struct dma_chan *c = &ioat_chan->dma_chan;
753 unsigned long data = (unsigned long) c;
754
755 ioat_chan->ioat_dma = ioat_dma;
756 ioat_chan->reg_base = ioat_dma->reg_base + (0x80 * (idx + 1));
757 spin_lock_init(&ioat_chan->cleanup_lock);
758 ioat_chan->dma_chan.device = dma;
759 dma_cookie_init(&ioat_chan->dma_chan);
760 list_add_tail(&ioat_chan->dma_chan.device_node, &dma->channels);
761 ioat_dma->idx[idx] = ioat_chan;
762 timer_setup(&ioat_chan->timer, ioat_timer_event, 0);
763 tasklet_init(&ioat_chan->cleanup_task, ioat_cleanup_event, data);
764 }
765
766 #define IOAT_NUM_SRC_TEST 6 /* must be <= 8 */
767 static int ioat_xor_val_self_test(struct ioatdma_device *ioat_dma)
768 {
769 int i, src_idx;
770 struct page *dest;
771 struct page *xor_srcs[IOAT_NUM_SRC_TEST];
772 struct page *xor_val_srcs[IOAT_NUM_SRC_TEST + 1];
773 dma_addr_t dma_srcs[IOAT_NUM_SRC_TEST + 1];
774 dma_addr_t dest_dma;
775 struct dma_async_tx_descriptor *tx;
776 struct dma_chan *dma_chan;
777 dma_cookie_t cookie;
778 u8 cmp_byte = 0;
779 u32 cmp_word;
780 u32 xor_val_result;
781 int err = 0;
782 struct completion cmp;
783 unsigned long tmo;
784 struct device *dev = &ioat_dma->pdev->dev;
785 struct dma_device *dma = &ioat_dma->dma_dev;
786 u8 op = 0;
787
788 dev_dbg(dev, "%s\n", __func__);
789
790 if (!dma_has_cap(DMA_XOR, dma->cap_mask))
791 return 0;
792
793 for (src_idx = 0; src_idx < IOAT_NUM_SRC_TEST; src_idx++) {
794 xor_srcs[src_idx] = alloc_page(GFP_KERNEL);
795 if (!xor_srcs[src_idx]) {
796 while (src_idx--)
797 __free_page(xor_srcs[src_idx]);
798 return -ENOMEM;
799 }
800 }
801
802 dest = alloc_page(GFP_KERNEL);
803 if (!dest) {
804 while (src_idx--)
805 __free_page(xor_srcs[src_idx]);
806 return -ENOMEM;
807 }
808
809 /* Fill in src buffers */
810 for (src_idx = 0; src_idx < IOAT_NUM_SRC_TEST; src_idx++) {
811 u8 *ptr = page_address(xor_srcs[src_idx]);
812
813 for (i = 0; i < PAGE_SIZE; i++)
814 ptr[i] = (1 << src_idx);
815 }
816
817 for (src_idx = 0; src_idx < IOAT_NUM_SRC_TEST; src_idx++)
818 cmp_byte ^= (u8) (1 << src_idx);
819
820 cmp_word = (cmp_byte << 24) | (cmp_byte << 16) |
821 (cmp_byte << 8) | cmp_byte;
822
823 memset(page_address(dest), 0, PAGE_SIZE);
824
825 dma_chan = container_of(dma->channels.next, struct dma_chan,
826 device_node);
827 if (dma->device_alloc_chan_resources(dma_chan) < 1) {
828 err = -ENODEV;
829 goto out;
830 }
831
832 /* test xor */
833 op = IOAT_OP_XOR;
834
835 dest_dma = dma_map_page(dev, dest, 0, PAGE_SIZE, DMA_FROM_DEVICE);
836 if (dma_mapping_error(dev, dest_dma)) {
837 err = -ENOMEM;
838 goto free_resources;
839 }
840
841 for (i = 0; i < IOAT_NUM_SRC_TEST; i++) {
842 dma_srcs[i] = dma_map_page(dev, xor_srcs[i], 0, PAGE_SIZE,
843 DMA_TO_DEVICE);
844 if (dma_mapping_error(dev, dma_srcs[i])) {
845 err = -ENOMEM;
846 goto dma_unmap;
847 }
848 }
849 tx = dma->device_prep_dma_xor(dma_chan, dest_dma, dma_srcs,
850 IOAT_NUM_SRC_TEST, PAGE_SIZE,
851 DMA_PREP_INTERRUPT);
852
853 if (!tx) {
854 dev_err(dev, "Self-test xor prep failed\n");
855 err = -ENODEV;
856 goto dma_unmap;
857 }
858
859 async_tx_ack(tx);
860 init_completion(&cmp);
861 tx->callback = ioat_dma_test_callback;
862 tx->callback_param = &cmp;
863 cookie = tx->tx_submit(tx);
864 if (cookie < 0) {
865 dev_err(dev, "Self-test xor setup failed\n");
866 err = -ENODEV;
867 goto dma_unmap;
868 }
869 dma->device_issue_pending(dma_chan);
870
871 tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
872
873 if (tmo == 0 ||
874 dma->device_tx_status(dma_chan, cookie, NULL) != DMA_COMPLETE) {
875 dev_err(dev, "Self-test xor timed out\n");
876 err = -ENODEV;
877 goto dma_unmap;
878 }
879
880 for (i = 0; i < IOAT_NUM_SRC_TEST; i++)
881 dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, DMA_TO_DEVICE);
882
883 dma_sync_single_for_cpu(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE);
884 for (i = 0; i < (PAGE_SIZE / sizeof(u32)); i++) {
885 u32 *ptr = page_address(dest);
886
887 if (ptr[i] != cmp_word) {
888 dev_err(dev, "Self-test xor failed compare\n");
889 err = -ENODEV;
890 goto free_resources;
891 }
892 }
893 dma_sync_single_for_device(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE);
894
895 dma_unmap_page(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE);
896
897 /* skip validate if the capability is not present */
898 if (!dma_has_cap(DMA_XOR_VAL, dma_chan->device->cap_mask))
899 goto free_resources;
900
901 op = IOAT_OP_XOR_VAL;
902
903 /* validate the sources with the destintation page */
904 for (i = 0; i < IOAT_NUM_SRC_TEST; i++)
905 xor_val_srcs[i] = xor_srcs[i];
906 xor_val_srcs[i] = dest;
907
908 xor_val_result = 1;
909
910 for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) {
911 dma_srcs[i] = dma_map_page(dev, xor_val_srcs[i], 0, PAGE_SIZE,
912 DMA_TO_DEVICE);
913 if (dma_mapping_error(dev, dma_srcs[i])) {
914 err = -ENOMEM;
915 goto dma_unmap;
916 }
917 }
918 tx = dma->device_prep_dma_xor_val(dma_chan, dma_srcs,
919 IOAT_NUM_SRC_TEST + 1, PAGE_SIZE,
920 &xor_val_result, DMA_PREP_INTERRUPT);
921 if (!tx) {
922 dev_err(dev, "Self-test zero prep failed\n");
923 err = -ENODEV;
924 goto dma_unmap;
925 }
926
927 async_tx_ack(tx);
928 init_completion(&cmp);
929 tx->callback = ioat_dma_test_callback;
930 tx->callback_param = &cmp;
931 cookie = tx->tx_submit(tx);
932 if (cookie < 0) {
933 dev_err(dev, "Self-test zero setup failed\n");
934 err = -ENODEV;
935 goto dma_unmap;
936 }
937 dma->device_issue_pending(dma_chan);
938
939 tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
940
941 if (tmo == 0 ||
942 dma->device_tx_status(dma_chan, cookie, NULL) != DMA_COMPLETE) {
943 dev_err(dev, "Self-test validate timed out\n");
944 err = -ENODEV;
945 goto dma_unmap;
946 }
947
948 for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++)
949 dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, DMA_TO_DEVICE);
950
951 if (xor_val_result != 0) {
952 dev_err(dev, "Self-test validate failed compare\n");
953 err = -ENODEV;
954 goto free_resources;
955 }
956
957 memset(page_address(dest), 0, PAGE_SIZE);
958
959 /* test for non-zero parity sum */
960 op = IOAT_OP_XOR_VAL;
961
962 xor_val_result = 0;
963 for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) {
964 dma_srcs[i] = dma_map_page(dev, xor_val_srcs[i], 0, PAGE_SIZE,
965 DMA_TO_DEVICE);
966 if (dma_mapping_error(dev, dma_srcs[i])) {
967 err = -ENOMEM;
968 goto dma_unmap;
969 }
970 }
971 tx = dma->device_prep_dma_xor_val(dma_chan, dma_srcs,
972 IOAT_NUM_SRC_TEST + 1, PAGE_SIZE,
973 &xor_val_result, DMA_PREP_INTERRUPT);
974 if (!tx) {
975 dev_err(dev, "Self-test 2nd zero prep failed\n");
976 err = -ENODEV;
977 goto dma_unmap;
978 }
979
980 async_tx_ack(tx);
981 init_completion(&cmp);
982 tx->callback = ioat_dma_test_callback;
983 tx->callback_param = &cmp;
984 cookie = tx->tx_submit(tx);
985 if (cookie < 0) {
986 dev_err(dev, "Self-test 2nd zero setup failed\n");
987 err = -ENODEV;
988 goto dma_unmap;
989 }
990 dma->device_issue_pending(dma_chan);
991
992 tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
993
994 if (tmo == 0 ||
995 dma->device_tx_status(dma_chan, cookie, NULL) != DMA_COMPLETE) {
996 dev_err(dev, "Self-test 2nd validate timed out\n");
997 err = -ENODEV;
998 goto dma_unmap;
999 }
1000
1001 if (xor_val_result != SUM_CHECK_P_RESULT) {
1002 dev_err(dev, "Self-test validate failed compare\n");
1003 err = -ENODEV;
1004 goto dma_unmap;
1005 }
1006
1007 for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++)
1008 dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, DMA_TO_DEVICE);
1009
1010 goto free_resources;
1011 dma_unmap:
1012 if (op == IOAT_OP_XOR) {
1013 while (--i >= 0)
1014 dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE,
1015 DMA_TO_DEVICE);
1016 dma_unmap_page(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE);
1017 } else if (op == IOAT_OP_XOR_VAL) {
1018 while (--i >= 0)
1019 dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE,
1020 DMA_TO_DEVICE);
1021 }
1022 free_resources:
1023 dma->device_free_chan_resources(dma_chan);
1024 out:
1025 src_idx = IOAT_NUM_SRC_TEST;
1026 while (src_idx--)
1027 __free_page(xor_srcs[src_idx]);
1028 __free_page(dest);
1029 return err;
1030 }
1031
1032 static int ioat3_dma_self_test(struct ioatdma_device *ioat_dma)
1033 {
1034 int rc;
1035
1036 rc = ioat_dma_self_test(ioat_dma);
1037 if (rc)
1038 return rc;
1039
1040 rc = ioat_xor_val_self_test(ioat_dma);
1041
1042 return rc;
1043 }
1044
1045 static void ioat_intr_quirk(struct ioatdma_device *ioat_dma)
1046 {
1047 struct dma_device *dma;
1048 struct dma_chan *c;
1049 struct ioatdma_chan *ioat_chan;
1050 u32 errmask;
1051
1052 dma = &ioat_dma->dma_dev;
1053
1054 /*
1055 * if we have descriptor write back error status, we mask the
1056 * error interrupts
1057 */
1058 if (ioat_dma->cap & IOAT_CAP_DWBES) {
1059 list_for_each_entry(c, &dma->channels, device_node) {
1060 ioat_chan = to_ioat_chan(c);
1061 errmask = readl(ioat_chan->reg_base +
1062 IOAT_CHANERR_MASK_OFFSET);
1063 errmask |= IOAT_CHANERR_XOR_P_OR_CRC_ERR |
1064 IOAT_CHANERR_XOR_Q_ERR;
1065 writel(errmask, ioat_chan->reg_base +
1066 IOAT_CHANERR_MASK_OFFSET);
1067 }
1068 }
1069 }
1070
1071 static int ioat3_dma_probe(struct ioatdma_device *ioat_dma, int dca)
1072 {
1073 struct pci_dev *pdev = ioat_dma->pdev;
1074 int dca_en = system_has_dca_enabled(pdev);
1075 struct dma_device *dma;
1076 struct dma_chan *c;
1077 struct ioatdma_chan *ioat_chan;
1078 int err;
1079 u16 val16;
1080
1081 dma = &ioat_dma->dma_dev;
1082 dma->device_prep_dma_memcpy = ioat_dma_prep_memcpy_lock;
1083 dma->device_issue_pending = ioat_issue_pending;
1084 dma->device_alloc_chan_resources = ioat_alloc_chan_resources;
1085 dma->device_free_chan_resources = ioat_free_chan_resources;
1086
1087 dma_cap_set(DMA_INTERRUPT, dma->cap_mask);
1088 dma->device_prep_dma_interrupt = ioat_prep_interrupt_lock;
1089
1090 ioat_dma->cap = readl(ioat_dma->reg_base + IOAT_DMA_CAP_OFFSET);
1091
1092 if (is_xeon_cb32(pdev) || is_bwd_noraid(pdev))
1093 ioat_dma->cap &=
1094 ~(IOAT_CAP_XOR | IOAT_CAP_PQ | IOAT_CAP_RAID16SS);
1095
1096 /* dca is incompatible with raid operations */
1097 if (dca_en && (ioat_dma->cap & (IOAT_CAP_XOR|IOAT_CAP_PQ)))
1098 ioat_dma->cap &= ~(IOAT_CAP_XOR|IOAT_CAP_PQ);
1099
1100 if (ioat_dma->cap & IOAT_CAP_XOR) {
1101 dma->max_xor = 8;
1102
1103 dma_cap_set(DMA_XOR, dma->cap_mask);
1104 dma->device_prep_dma_xor = ioat_prep_xor;
1105
1106 dma_cap_set(DMA_XOR_VAL, dma->cap_mask);
1107 dma->device_prep_dma_xor_val = ioat_prep_xor_val;
1108 }
1109
1110 if (ioat_dma->cap & IOAT_CAP_PQ) {
1111
1112 dma->device_prep_dma_pq = ioat_prep_pq;
1113 dma->device_prep_dma_pq_val = ioat_prep_pq_val;
1114 dma_cap_set(DMA_PQ, dma->cap_mask);
1115 dma_cap_set(DMA_PQ_VAL, dma->cap_mask);
1116
1117 if (ioat_dma->cap & IOAT_CAP_RAID16SS)
1118 dma_set_maxpq(dma, 16, 0);
1119 else
1120 dma_set_maxpq(dma, 8, 0);
1121
1122 if (!(ioat_dma->cap & IOAT_CAP_XOR)) {
1123 dma->device_prep_dma_xor = ioat_prep_pqxor;
1124 dma->device_prep_dma_xor_val = ioat_prep_pqxor_val;
1125 dma_cap_set(DMA_XOR, dma->cap_mask);
1126 dma_cap_set(DMA_XOR_VAL, dma->cap_mask);
1127
1128 if (ioat_dma->cap & IOAT_CAP_RAID16SS)
1129 dma->max_xor = 16;
1130 else
1131 dma->max_xor = 8;
1132 }
1133 }
1134
1135 dma->device_tx_status = ioat_tx_status;
1136
1137 /* starting with CB3.3 super extended descriptors are supported */
1138 if (ioat_dma->cap & IOAT_CAP_RAID16SS) {
1139 char pool_name[14];
1140 int i;
1141
1142 for (i = 0; i < MAX_SED_POOLS; i++) {
1143 snprintf(pool_name, 14, "ioat_hw%d_sed", i);
1144
1145 /* allocate SED DMA pool */
1146 ioat_dma->sed_hw_pool[i] = dmam_pool_create(pool_name,
1147 &pdev->dev,
1148 SED_SIZE * (i + 1), 64, 0);
1149 if (!ioat_dma->sed_hw_pool[i])
1150 return -ENOMEM;
1151
1152 }
1153 }
1154
1155 if (!(ioat_dma->cap & (IOAT_CAP_XOR | IOAT_CAP_PQ)))
1156 dma_cap_set(DMA_PRIVATE, dma->cap_mask);
1157
1158 err = ioat_probe(ioat_dma);
1159 if (err)
1160 return err;
1161
1162 list_for_each_entry(c, &dma->channels, device_node) {
1163 ioat_chan = to_ioat_chan(c);
1164 writel(IOAT_DMA_DCA_ANY_CPU,
1165 ioat_chan->reg_base + IOAT_DCACTRL_OFFSET);
1166 }
1167
1168 err = ioat_register(ioat_dma);
1169 if (err)
1170 return err;
1171
1172 ioat_kobject_add(ioat_dma, &ioat_ktype);
1173
1174 if (dca)
1175 ioat_dma->dca = ioat_dca_init(pdev, ioat_dma->reg_base);
1176
1177 /* disable relaxed ordering */
1178 err = pcie_capability_read_word(pdev, IOAT_DEVCTRL_OFFSET, &val16);
1179 if (err)
1180 return err;
1181
1182 /* clear relaxed ordering enable */
1183 val16 &= ~IOAT_DEVCTRL_ROE;
1184 err = pcie_capability_write_word(pdev, IOAT_DEVCTRL_OFFSET, val16);
1185 if (err)
1186 return err;
1187
1188 return 0;
1189 }
1190
1191 static void ioat_shutdown(struct pci_dev *pdev)
1192 {
1193 struct ioatdma_device *ioat_dma = pci_get_drvdata(pdev);
1194 struct ioatdma_chan *ioat_chan;
1195 int i;
1196
1197 if (!ioat_dma)
1198 return;
1199
1200 for (i = 0; i < IOAT_MAX_CHANS; i++) {
1201 ioat_chan = ioat_dma->idx[i];
1202 if (!ioat_chan)
1203 continue;
1204
1205 spin_lock_bh(&ioat_chan->prep_lock);
1206 set_bit(IOAT_CHAN_DOWN, &ioat_chan->state);
1207 spin_unlock_bh(&ioat_chan->prep_lock);
1208 /*
1209 * Synchronization rule for del_timer_sync():
1210 * - The caller must not hold locks which would prevent
1211 * completion of the timer's handler.
1212 * So prep_lock cannot be held before calling it.
1213 */
1214 del_timer_sync(&ioat_chan->timer);
1215
1216 /* this should quiesce then reset */
1217 ioat_reset_hw(ioat_chan);
1218 }
1219
1220 ioat_disable_interrupts(ioat_dma);
1221 }
1222
1223 static void ioat_resume(struct ioatdma_device *ioat_dma)
1224 {
1225 struct ioatdma_chan *ioat_chan;
1226 u32 chanerr;
1227 int i;
1228
1229 for (i = 0; i < IOAT_MAX_CHANS; i++) {
1230 ioat_chan = ioat_dma->idx[i];
1231 if (!ioat_chan)
1232 continue;
1233
1234 spin_lock_bh(&ioat_chan->prep_lock);
1235 clear_bit(IOAT_CHAN_DOWN, &ioat_chan->state);
1236 spin_unlock_bh(&ioat_chan->prep_lock);
1237
1238 chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
1239 writel(chanerr, ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
1240
1241 /* no need to reset as shutdown already did that */
1242 }
1243 }
1244
1245 #define DRV_NAME "ioatdma"
1246
1247 static pci_ers_result_t ioat_pcie_error_detected(struct pci_dev *pdev,
1248 enum pci_channel_state error)
1249 {
1250 dev_dbg(&pdev->dev, "%s: PCIe AER error %d\n", DRV_NAME, error);
1251
1252 /* quiesce and block I/O */
1253 ioat_shutdown(pdev);
1254
1255 return PCI_ERS_RESULT_NEED_RESET;
1256 }
1257
1258 static pci_ers_result_t ioat_pcie_error_slot_reset(struct pci_dev *pdev)
1259 {
1260 pci_ers_result_t result = PCI_ERS_RESULT_RECOVERED;
1261
1262 dev_dbg(&pdev->dev, "%s post reset handling\n", DRV_NAME);
1263
1264 if (pci_enable_device_mem(pdev) < 0) {
1265 dev_err(&pdev->dev,
1266 "Failed to enable PCIe device after reset.\n");
1267 result = PCI_ERS_RESULT_DISCONNECT;
1268 } else {
1269 pci_set_master(pdev);
1270 pci_restore_state(pdev);
1271 pci_save_state(pdev);
1272 pci_wake_from_d3(pdev, false);
1273 }
1274
1275 return result;
1276 }
1277
1278 static void ioat_pcie_error_resume(struct pci_dev *pdev)
1279 {
1280 struct ioatdma_device *ioat_dma = pci_get_drvdata(pdev);
1281
1282 dev_dbg(&pdev->dev, "%s: AER handling resuming\n", DRV_NAME);
1283
1284 /* initialize and bring everything back */
1285 ioat_resume(ioat_dma);
1286 }
1287
1288 static const struct pci_error_handlers ioat_err_handler = {
1289 .error_detected = ioat_pcie_error_detected,
1290 .slot_reset = ioat_pcie_error_slot_reset,
1291 .resume = ioat_pcie_error_resume,
1292 };
1293
1294 static struct pci_driver ioat_pci_driver = {
1295 .name = DRV_NAME,
1296 .id_table = ioat_pci_tbl,
1297 .probe = ioat_pci_probe,
1298 .remove = ioat_remove,
1299 .shutdown = ioat_shutdown,
1300 .err_handler = &ioat_err_handler,
1301 };
1302
1303 static struct ioatdma_device *
1304 alloc_ioatdma(struct pci_dev *pdev, void __iomem *iobase)
1305 {
1306 struct device *dev = &pdev->dev;
1307 struct ioatdma_device *d = devm_kzalloc(dev, sizeof(*d), GFP_KERNEL);
1308
1309 if (!d)
1310 return NULL;
1311 d->pdev = pdev;
1312 d->reg_base = iobase;
1313 return d;
1314 }
1315
1316 static int ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
1317 {
1318 void __iomem * const *iomap;
1319 struct device *dev = &pdev->dev;
1320 struct ioatdma_device *device;
1321 int err;
1322
1323 err = pcim_enable_device(pdev);
1324 if (err)
1325 return err;
1326
1327 err = pcim_iomap_regions(pdev, 1 << IOAT_MMIO_BAR, DRV_NAME);
1328 if (err)
1329 return err;
1330 iomap = pcim_iomap_table(pdev);
1331 if (!iomap)
1332 return -ENOMEM;
1333
1334 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
1335 if (err)
1336 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
1337 if (err)
1338 return err;
1339
1340 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
1341 if (err)
1342 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
1343 if (err)
1344 return err;
1345
1346 device = alloc_ioatdma(pdev, iomap[IOAT_MMIO_BAR]);
1347 if (!device)
1348 return -ENOMEM;
1349 pci_set_master(pdev);
1350 pci_set_drvdata(pdev, device);
1351
1352 device->version = readb(device->reg_base + IOAT_VER_OFFSET);
1353 if (device->version >= IOAT_VER_3_0) {
1354 if (is_skx_ioat(pdev))
1355 device->version = IOAT_VER_3_2;
1356 err = ioat3_dma_probe(device, ioat_dca_enabled);
1357
1358 if (device->version >= IOAT_VER_3_3)
1359 pci_enable_pcie_error_reporting(pdev);
1360 } else
1361 return -ENODEV;
1362
1363 if (err) {
1364 dev_err(dev, "Intel(R) I/OAT DMA Engine init failed\n");
1365 pci_disable_pcie_error_reporting(pdev);
1366 return -ENODEV;
1367 }
1368
1369 return 0;
1370 }
1371
1372 static void ioat_remove(struct pci_dev *pdev)
1373 {
1374 struct ioatdma_device *device = pci_get_drvdata(pdev);
1375
1376 if (!device)
1377 return;
1378
1379 dev_err(&pdev->dev, "Removing dma and dca services\n");
1380 if (device->dca) {
1381 unregister_dca_provider(device->dca, &pdev->dev);
1382 free_dca_provider(device->dca);
1383 device->dca = NULL;
1384 }
1385
1386 pci_disable_pcie_error_reporting(pdev);
1387 ioat_dma_remove(device);
1388 }
1389
1390 static int __init ioat_init_module(void)
1391 {
1392 int err = -ENOMEM;
1393
1394 pr_info("%s: Intel(R) QuickData Technology Driver %s\n",
1395 DRV_NAME, IOAT_DMA_VERSION);
1396
1397 ioat_cache = kmem_cache_create("ioat", sizeof(struct ioat_ring_ent),
1398 0, SLAB_HWCACHE_ALIGN, NULL);
1399 if (!ioat_cache)
1400 return -ENOMEM;
1401
1402 ioat_sed_cache = KMEM_CACHE(ioat_sed_ent, 0);
1403 if (!ioat_sed_cache)
1404 goto err_ioat_cache;
1405
1406 err = pci_register_driver(&ioat_pci_driver);
1407 if (err)
1408 goto err_ioat3_cache;
1409
1410 return 0;
1411
1412 err_ioat3_cache:
1413 kmem_cache_destroy(ioat_sed_cache);
1414
1415 err_ioat_cache:
1416 kmem_cache_destroy(ioat_cache);
1417
1418 return err;
1419 }
1420 module_init(ioat_init_module);
1421
1422 static void __exit ioat_exit_module(void)
1423 {
1424 pci_unregister_driver(&ioat_pci_driver);
1425 kmem_cache_destroy(ioat_cache);
1426 }
1427 module_exit(ioat_exit_module);
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