?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
WIP FPC-III support
[linux/fpc-iii.git] / drivers / dma / ioat / init.c
blob191b5927900739520ba94bb3b664dec7f7b681b0
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Intel I/OAT DMA Linux driver
4 * Copyright(c) 2004 - 2015 Intel Corporation.
5 */
6
7 #include <linux/init.h>
8 #include <linux/module.h>
9 #include <linux/slab.h>
10 #include <linux/pci.h>
11 #include <linux/interrupt.h>
12 #include <linux/dmaengine.h>
13 #include <linux/delay.h>
14 #include <linux/dma-mapping.h>
15 #include <linux/workqueue.h>
16 #include <linux/prefetch.h>
17 #include <linux/dca.h>
18 #include <linux/aer.h>
19 #include <linux/sizes.h>
20 #include "dma.h"
21 #include "registers.h"
22 #include "hw.h"
23
24 #include "../dmaengine.h"
25
26 MODULE_VERSION(IOAT_DMA_VERSION);
27 MODULE_LICENSE("Dual BSD/GPL");
28 MODULE_AUTHOR("Intel Corporation");
29
30 static const struct pci_device_id ioat_pci_tbl[] = {
31 /* I/OAT v3 platforms */
32 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG0) },
33 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG1) },
34 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG2) },
35 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG3) },
36 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG4) },
37 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG5) },
38 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG6) },
39 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG7) },
40
41 /* I/OAT v3.2 platforms */
42 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF0) },
43 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF1) },
44 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF2) },
45 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF3) },
46 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF4) },
47 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF5) },
48 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF6) },
49 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF7) },
50 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF8) },
51 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF9) },
52
53 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB0) },
54 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB1) },
55 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB2) },
56 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB3) },
57 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB4) },
58 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB5) },
59 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB6) },
60 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB7) },
61 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB8) },
62 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB9) },
63
64 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB0) },
65 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB1) },
66 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB2) },
67 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB3) },
68 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB4) },
69 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB5) },
70 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB6) },
71 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB7) },
72 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB8) },
73 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB9) },
74
75 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW0) },
76 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW1) },
77 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW2) },
78 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW3) },
79 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW4) },
80 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW5) },
81 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW6) },
82 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW7) },
83 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW8) },
84 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW9) },
85
86 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX0) },
87 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX1) },
88 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX2) },
89 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX3) },
90 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX4) },
91 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX5) },
92 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX6) },
93 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX7) },
94 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX8) },
95 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX9) },
96
97 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SKX) },
98
99 /* I/OAT v3.3 platforms */
100 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD0) },
101 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD1) },
102 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD2) },
103 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD3) },
104
105 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE0) },
106 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE1) },
107 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE2) },
108 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE3) },
109
110 /* I/OAT v3.4 platforms */
111 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_ICX) },
112
113 { 0, }
114 };
115 MODULE_DEVICE_TABLE(pci, ioat_pci_tbl);
116
117 static int ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id);
118 static void ioat_remove(struct pci_dev *pdev);
119 static void
120 ioat_init_channel(struct ioatdma_device *ioat_dma,
121 struct ioatdma_chan *ioat_chan, int idx);
122 static void ioat_intr_quirk(struct ioatdma_device *ioat_dma);
123 static void ioat_enumerate_channels(struct ioatdma_device *ioat_dma);
124 static int ioat3_dma_self_test(struct ioatdma_device *ioat_dma);
125
126 static int ioat_dca_enabled = 1;
127 module_param(ioat_dca_enabled, int, 0644);
128 MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)");
129 int ioat_pending_level = 7;
130 module_param(ioat_pending_level, int, 0644);
131 MODULE_PARM_DESC(ioat_pending_level,
132 "high-water mark for pushing ioat descriptors (default: 7)");
133 static char ioat_interrupt_style[32] = "msix";
134 module_param_string(ioat_interrupt_style, ioat_interrupt_style,
135 sizeof(ioat_interrupt_style), 0644);
136 MODULE_PARM_DESC(ioat_interrupt_style,
137 "set ioat interrupt style: msix (default), msi, intx");
138
139 struct kmem_cache *ioat_cache;
140 struct kmem_cache *ioat_sed_cache;
141
142 static bool is_jf_ioat(struct pci_dev *pdev)
143 {
144 switch (pdev->device) {
145 case PCI_DEVICE_ID_INTEL_IOAT_JSF0:
146 case PCI_DEVICE_ID_INTEL_IOAT_JSF1:
147 case PCI_DEVICE_ID_INTEL_IOAT_JSF2:
148 case PCI_DEVICE_ID_INTEL_IOAT_JSF3:
149 case PCI_DEVICE_ID_INTEL_IOAT_JSF4:
150 case PCI_DEVICE_ID_INTEL_IOAT_JSF5:
151 case PCI_DEVICE_ID_INTEL_IOAT_JSF6:
152 case PCI_DEVICE_ID_INTEL_IOAT_JSF7:
153 case PCI_DEVICE_ID_INTEL_IOAT_JSF8:
154 case PCI_DEVICE_ID_INTEL_IOAT_JSF9:
155 return true;
156 default:
157 return false;
158 }
159 }
160
161 static bool is_snb_ioat(struct pci_dev *pdev)
162 {
163 switch (pdev->device) {
164 case PCI_DEVICE_ID_INTEL_IOAT_SNB0:
165 case PCI_DEVICE_ID_INTEL_IOAT_SNB1:
166 case PCI_DEVICE_ID_INTEL_IOAT_SNB2:
167 case PCI_DEVICE_ID_INTEL_IOAT_SNB3:
168 case PCI_DEVICE_ID_INTEL_IOAT_SNB4:
169 case PCI_DEVICE_ID_INTEL_IOAT_SNB5:
170 case PCI_DEVICE_ID_INTEL_IOAT_SNB6:
171 case PCI_DEVICE_ID_INTEL_IOAT_SNB7:
172 case PCI_DEVICE_ID_INTEL_IOAT_SNB8:
173 case PCI_DEVICE_ID_INTEL_IOAT_SNB9:
174 return true;
175 default:
176 return false;
177 }
178 }
179
180 static bool is_ivb_ioat(struct pci_dev *pdev)
181 {
182 switch (pdev->device) {
183 case PCI_DEVICE_ID_INTEL_IOAT_IVB0:
184 case PCI_DEVICE_ID_INTEL_IOAT_IVB1:
185 case PCI_DEVICE_ID_INTEL_IOAT_IVB2:
186 case PCI_DEVICE_ID_INTEL_IOAT_IVB3:
187 case PCI_DEVICE_ID_INTEL_IOAT_IVB4:
188 case PCI_DEVICE_ID_INTEL_IOAT_IVB5:
189 case PCI_DEVICE_ID_INTEL_IOAT_IVB6:
190 case PCI_DEVICE_ID_INTEL_IOAT_IVB7:
191 case PCI_DEVICE_ID_INTEL_IOAT_IVB8:
192 case PCI_DEVICE_ID_INTEL_IOAT_IVB9:
193 return true;
194 default:
195 return false;
196 }
197
198 }
199
200 static bool is_hsw_ioat(struct pci_dev *pdev)
201 {
202 switch (pdev->device) {
203 case PCI_DEVICE_ID_INTEL_IOAT_HSW0:
204 case PCI_DEVICE_ID_INTEL_IOAT_HSW1:
205 case PCI_DEVICE_ID_INTEL_IOAT_HSW2:
206 case PCI_DEVICE_ID_INTEL_IOAT_HSW3:
207 case PCI_DEVICE_ID_INTEL_IOAT_HSW4:
208 case PCI_DEVICE_ID_INTEL_IOAT_HSW5:
209 case PCI_DEVICE_ID_INTEL_IOAT_HSW6:
210 case PCI_DEVICE_ID_INTEL_IOAT_HSW7:
211 case PCI_DEVICE_ID_INTEL_IOAT_HSW8:
212 case PCI_DEVICE_ID_INTEL_IOAT_HSW9:
213 return true;
214 default:
215 return false;
216 }
217
218 }
219
220 static bool is_bdx_ioat(struct pci_dev *pdev)
221 {
222 switch (pdev->device) {
223 case PCI_DEVICE_ID_INTEL_IOAT_BDX0:
224 case PCI_DEVICE_ID_INTEL_IOAT_BDX1:
225 case PCI_DEVICE_ID_INTEL_IOAT_BDX2:
226 case PCI_DEVICE_ID_INTEL_IOAT_BDX3:
227 case PCI_DEVICE_ID_INTEL_IOAT_BDX4:
228 case PCI_DEVICE_ID_INTEL_IOAT_BDX5:
229 case PCI_DEVICE_ID_INTEL_IOAT_BDX6:
230 case PCI_DEVICE_ID_INTEL_IOAT_BDX7:
231 case PCI_DEVICE_ID_INTEL_IOAT_BDX8:
232 case PCI_DEVICE_ID_INTEL_IOAT_BDX9:
233 return true;
234 default:
235 return false;
236 }
237 }
238
239 static inline bool is_skx_ioat(struct pci_dev *pdev)
240 {
241 return (pdev->device == PCI_DEVICE_ID_INTEL_IOAT_SKX) ? true : false;
242 }
243
244 static bool is_xeon_cb32(struct pci_dev *pdev)
245 {
246 return is_jf_ioat(pdev) || is_snb_ioat(pdev) || is_ivb_ioat(pdev) ||
247 is_hsw_ioat(pdev) || is_bdx_ioat(pdev) || is_skx_ioat(pdev);
248 }
249
250 bool is_bwd_ioat(struct pci_dev *pdev)
251 {
252 switch (pdev->device) {
253 case PCI_DEVICE_ID_INTEL_IOAT_BWD0:
254 case PCI_DEVICE_ID_INTEL_IOAT_BWD1:
255 case PCI_DEVICE_ID_INTEL_IOAT_BWD2:
256 case PCI_DEVICE_ID_INTEL_IOAT_BWD3:
257 /* even though not Atom, BDX-DE has same DMA silicon */
258 case PCI_DEVICE_ID_INTEL_IOAT_BDXDE0:
259 case PCI_DEVICE_ID_INTEL_IOAT_BDXDE1:
260 case PCI_DEVICE_ID_INTEL_IOAT_BDXDE2:
261 case PCI_DEVICE_ID_INTEL_IOAT_BDXDE3:
262 return true;
263 default:
264 return false;
265 }
266 }
267
268 static bool is_bwd_noraid(struct pci_dev *pdev)
269 {
270 switch (pdev->device) {
271 case PCI_DEVICE_ID_INTEL_IOAT_BWD2:
272 case PCI_DEVICE_ID_INTEL_IOAT_BWD3:
273 case PCI_DEVICE_ID_INTEL_IOAT_BDXDE0:
274 case PCI_DEVICE_ID_INTEL_IOAT_BDXDE1:
275 case PCI_DEVICE_ID_INTEL_IOAT_BDXDE2:
276 case PCI_DEVICE_ID_INTEL_IOAT_BDXDE3:
277 return true;
278 default:
279 return false;
280 }
281
282 }
283
284 /*
285 * Perform a IOAT transaction to verify the HW works.
286 */
287 #define IOAT_TEST_SIZE 2000
288
289 static void ioat_dma_test_callback(void *dma_async_param)
290 {
291 struct completion *cmp = dma_async_param;
292
293 complete(cmp);
294 }
295
296 /**
297 * ioat_dma_self_test - Perform a IOAT transaction to verify the HW works.
298 * @ioat_dma: dma device to be tested
299 */
300 static int ioat_dma_self_test(struct ioatdma_device *ioat_dma)
301 {
302 int i;
303 u8 *src;
304 u8 *dest;
305 struct dma_device *dma = &ioat_dma->dma_dev;
306 struct device *dev = &ioat_dma->pdev->dev;
307 struct dma_chan *dma_chan;
308 struct dma_async_tx_descriptor *tx;
309 dma_addr_t dma_dest, dma_src;
310 dma_cookie_t cookie;
311 int err = 0;
312 struct completion cmp;
313 unsigned long tmo;
314 unsigned long flags;
315
316 src = kzalloc(IOAT_TEST_SIZE, GFP_KERNEL);
317 if (!src)
318 return -ENOMEM;
319 dest = kzalloc(IOAT_TEST_SIZE, GFP_KERNEL);
320 if (!dest) {
321 kfree(src);
322 return -ENOMEM;
323 }
324
325 /* Fill in src buffer */
326 for (i = 0; i < IOAT_TEST_SIZE; i++)
327 src[i] = (u8)i;
328
329 /* Start copy, using first DMA channel */
330 dma_chan = container_of(dma->channels.next, struct dma_chan,
331 device_node);
332 if (dma->device_alloc_chan_resources(dma_chan) < 1) {
333 dev_err(dev, "selftest cannot allocate chan resource\n");
334 err = -ENODEV;
335 goto out;
336 }
337
338 dma_src = dma_map_single(dev, src, IOAT_TEST_SIZE, DMA_TO_DEVICE);
339 if (dma_mapping_error(dev, dma_src)) {
340 dev_err(dev, "mapping src buffer failed\n");
341 err = -ENOMEM;
342 goto free_resources;
343 }
344 dma_dest = dma_map_single(dev, dest, IOAT_TEST_SIZE, DMA_FROM_DEVICE);
345 if (dma_mapping_error(dev, dma_dest)) {
346 dev_err(dev, "mapping dest buffer failed\n");
347 err = -ENOMEM;
348 goto unmap_src;
349 }
350 flags = DMA_PREP_INTERRUPT;
351 tx = ioat_dma->dma_dev.device_prep_dma_memcpy(dma_chan, dma_dest,
352 dma_src, IOAT_TEST_SIZE,
353 flags);
354 if (!tx) {
355 dev_err(dev, "Self-test prep failed, disabling\n");
356 err = -ENODEV;
357 goto unmap_dma;
358 }
359
360 async_tx_ack(tx);
361 init_completion(&cmp);
362 tx->callback = ioat_dma_test_callback;
363 tx->callback_param = &cmp;
364 cookie = tx->tx_submit(tx);
365 if (cookie < 0) {
366 dev_err(dev, "Self-test setup failed, disabling\n");
367 err = -ENODEV;
368 goto unmap_dma;
369 }
370 dma->device_issue_pending(dma_chan);
371
372 tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
373
374 if (tmo == 0 ||
375 dma->device_tx_status(dma_chan, cookie, NULL)
376 != DMA_COMPLETE) {
377 dev_err(dev, "Self-test copy timed out, disabling\n");
378 err = -ENODEV;
379 goto unmap_dma;
380 }
381 if (memcmp(src, dest, IOAT_TEST_SIZE)) {
382 dev_err(dev, "Self-test copy failed compare, disabling\n");
383 err = -ENODEV;
384 goto unmap_dma;
385 }
386
387 unmap_dma:
388 dma_unmap_single(dev, dma_dest, IOAT_TEST_SIZE, DMA_FROM_DEVICE);
389 unmap_src:
390 dma_unmap_single(dev, dma_src, IOAT_TEST_SIZE, DMA_TO_DEVICE);
391 free_resources:
392 dma->device_free_chan_resources(dma_chan);
393 out:
394 kfree(src);
395 kfree(dest);
396 return err;
397 }
398
399 /**
400 * ioat_dma_setup_interrupts - setup interrupt handler
401 * @ioat_dma: ioat dma device
402 */
403 int ioat_dma_setup_interrupts(struct ioatdma_device *ioat_dma)
404 {
405 struct ioatdma_chan *ioat_chan;
406 struct pci_dev *pdev = ioat_dma->pdev;
407 struct device *dev = &pdev->dev;
408 struct msix_entry *msix;
409 int i, j, msixcnt;
410 int err = -EINVAL;
411 u8 intrctrl = 0;
412
413 if (!strcmp(ioat_interrupt_style, "msix"))
414 goto msix;
415 if (!strcmp(ioat_interrupt_style, "msi"))
416 goto msi;
417 if (!strcmp(ioat_interrupt_style, "intx"))
418 goto intx;
419 dev_err(dev, "invalid ioat_interrupt_style %s\n", ioat_interrupt_style);
420 goto err_no_irq;
421
422 msix:
423 /* The number of MSI-X vectors should equal the number of channels */
424 msixcnt = ioat_dma->dma_dev.chancnt;
425 for (i = 0; i < msixcnt; i++)
426 ioat_dma->msix_entries[i].entry = i;
427
428 err = pci_enable_msix_exact(pdev, ioat_dma->msix_entries, msixcnt);
429 if (err)
430 goto msi;
431
432 for (i = 0; i < msixcnt; i++) {
433 msix = &ioat_dma->msix_entries[i];
434 ioat_chan = ioat_chan_by_index(ioat_dma, i);
435 err = devm_request_irq(dev, msix->vector,
436 ioat_dma_do_interrupt_msix, 0,
437 "ioat-msix", ioat_chan);
438 if (err) {
439 for (j = 0; j < i; j++) {
440 msix = &ioat_dma->msix_entries[j];
441 ioat_chan = ioat_chan_by_index(ioat_dma, j);
442 devm_free_irq(dev, msix->vector, ioat_chan);
443 }
444 goto msi;
445 }
446 }
447 intrctrl |= IOAT_INTRCTRL_MSIX_VECTOR_CONTROL;
448 ioat_dma->irq_mode = IOAT_MSIX;
449 goto done;
450
451 msi:
452 err = pci_enable_msi(pdev);
453 if (err)
454 goto intx;
455
456 err = devm_request_irq(dev, pdev->irq, ioat_dma_do_interrupt, 0,
457 "ioat-msi", ioat_dma);
458 if (err) {
459 pci_disable_msi(pdev);
460 goto intx;
461 }
462 ioat_dma->irq_mode = IOAT_MSI;
463 goto done;
464
465 intx:
466 err = devm_request_irq(dev, pdev->irq, ioat_dma_do_interrupt,
467 IRQF_SHARED, "ioat-intx", ioat_dma);
468 if (err)
469 goto err_no_irq;
470
471 ioat_dma->irq_mode = IOAT_INTX;
472 done:
473 if (is_bwd_ioat(pdev))
474 ioat_intr_quirk(ioat_dma);
475 intrctrl |= IOAT_INTRCTRL_MASTER_INT_EN;
476 writeb(intrctrl, ioat_dma->reg_base + IOAT_INTRCTRL_OFFSET);
477 return 0;
478
479 err_no_irq:
480 /* Disable all interrupt generation */
481 writeb(0, ioat_dma->reg_base + IOAT_INTRCTRL_OFFSET);
482 ioat_dma->irq_mode = IOAT_NOIRQ;
483 dev_err(dev, "no usable interrupts\n");
484 return err;
485 }
486
487 static void ioat_disable_interrupts(struct ioatdma_device *ioat_dma)
488 {
489 /* Disable all interrupt generation */
490 writeb(0, ioat_dma->reg_base + IOAT_INTRCTRL_OFFSET);
491 }
492
493 static int ioat_probe(struct ioatdma_device *ioat_dma)
494 {
495 int err = -ENODEV;
496 struct dma_device *dma = &ioat_dma->dma_dev;
497 struct pci_dev *pdev = ioat_dma->pdev;
498 struct device *dev = &pdev->dev;
499
500 ioat_dma->completion_pool = dma_pool_create("completion_pool", dev,
501 sizeof(u64),
502 SMP_CACHE_BYTES,
503 SMP_CACHE_BYTES);
504
505 if (!ioat_dma->completion_pool) {
506 err = -ENOMEM;
507 goto err_out;
508 }
509
510 ioat_enumerate_channels(ioat_dma);
511
512 dma_cap_set(DMA_MEMCPY, dma->cap_mask);
513 dma->dev = &pdev->dev;
514
515 if (!dma->chancnt) {
516 dev_err(dev, "channel enumeration error\n");
517 goto err_setup_interrupts;
518 }
519
520 err = ioat_dma_setup_interrupts(ioat_dma);
521 if (err)
522 goto err_setup_interrupts;
523
524 err = ioat3_dma_self_test(ioat_dma);
525 if (err)
526 goto err_self_test;
527
528 return 0;
529
530 err_self_test:
531 ioat_disable_interrupts(ioat_dma);
532 err_setup_interrupts:
533 dma_pool_destroy(ioat_dma->completion_pool);
534 err_out:
535 return err;
536 }
537
538 static int ioat_register(struct ioatdma_device *ioat_dma)
539 {
540 int err = dma_async_device_register(&ioat_dma->dma_dev);
541
542 if (err) {
543 ioat_disable_interrupts(ioat_dma);
544 dma_pool_destroy(ioat_dma->completion_pool);
545 }
546
547 return err;
548 }
549
550 static void ioat_dma_remove(struct ioatdma_device *ioat_dma)
551 {
552 struct dma_device *dma = &ioat_dma->dma_dev;
553
554 ioat_disable_interrupts(ioat_dma);
555
556 ioat_kobject_del(ioat_dma);
557
558 dma_async_device_unregister(dma);
559 }
560
561 /**
562 * ioat_enumerate_channels - find and initialize the device's channels
563 * @ioat_dma: the ioat dma device to be enumerated
564 */
565 static void ioat_enumerate_channels(struct ioatdma_device *ioat_dma)
566 {
567 struct ioatdma_chan *ioat_chan;
568 struct device *dev = &ioat_dma->pdev->dev;
569 struct dma_device *dma = &ioat_dma->dma_dev;
570 u8 xfercap_log;
571 int i;
572
573 INIT_LIST_HEAD(&dma->channels);
574 dma->chancnt = readb(ioat_dma->reg_base + IOAT_CHANCNT_OFFSET);
575 dma->chancnt &= 0x1f; /* bits [4:0] valid */
576 if (dma->chancnt > ARRAY_SIZE(ioat_dma->idx)) {
577 dev_warn(dev, "(%d) exceeds max supported channels (%zu)\n",
578 dma->chancnt, ARRAY_SIZE(ioat_dma->idx));
579 dma->chancnt = ARRAY_SIZE(ioat_dma->idx);
580 }
581 xfercap_log = readb(ioat_dma->reg_base + IOAT_XFERCAP_OFFSET);
582 xfercap_log &= 0x1f; /* bits [4:0] valid */
583 if (xfercap_log == 0)
584 return;
585 dev_dbg(dev, "%s: xfercap = %d\n", __func__, 1 << xfercap_log);
586
587 for (i = 0; i < dma->chancnt; i++) {
588 ioat_chan = kzalloc(sizeof(*ioat_chan), GFP_KERNEL);
589 if (!ioat_chan)
590 break;
591
592 ioat_init_channel(ioat_dma, ioat_chan, i);
593 ioat_chan->xfercap_log = xfercap_log;
594 spin_lock_init(&ioat_chan->prep_lock);
595 if (ioat_reset_hw(ioat_chan)) {
596 i = 0;
597 break;
598 }
599 }
600 dma->chancnt = i;
601 }
602
603 /**
604 * ioat_free_chan_resources - release all the descriptors
605 * @c: the channel to be cleaned
606 */
607 static void ioat_free_chan_resources(struct dma_chan *c)
608 {
609 struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
610 struct ioatdma_device *ioat_dma = ioat_chan->ioat_dma;
611 struct ioat_ring_ent *desc;
612 const int total_descs = 1 << ioat_chan->alloc_order;
613 int descs;
614 int i;
615
616 /* Before freeing channel resources first check
617 * if they have been previously allocated for this channel.
618 */
619 if (!ioat_chan->ring)
620 return;
621
622 ioat_stop(ioat_chan);
623
624 if (!test_bit(IOAT_CHAN_DOWN, &ioat_chan->state)) {
625 ioat_reset_hw(ioat_chan);
626
627 /* Put LTR to idle */
628 if (ioat_dma->version >= IOAT_VER_3_4)
629 writeb(IOAT_CHAN_LTR_SWSEL_IDLE,
630 ioat_chan->reg_base +
631 IOAT_CHAN_LTR_SWSEL_OFFSET);
632 }
633
634 spin_lock_bh(&ioat_chan->cleanup_lock);
635 spin_lock_bh(&ioat_chan->prep_lock);
636 descs = ioat_ring_space(ioat_chan);
637 dev_dbg(to_dev(ioat_chan), "freeing %d idle descriptors\n", descs);
638 for (i = 0; i < descs; i++) {
639 desc = ioat_get_ring_ent(ioat_chan, ioat_chan->head + i);
640 ioat_free_ring_ent(desc, c);
641 }
642
643 if (descs < total_descs)
644 dev_err(to_dev(ioat_chan), "Freeing %d in use descriptors!\n",
645 total_descs - descs);
646
647 for (i = 0; i < total_descs - descs; i++) {
648 desc = ioat_get_ring_ent(ioat_chan, ioat_chan->tail + i);
649 dump_desc_dbg(ioat_chan, desc);
650 ioat_free_ring_ent(desc, c);
651 }
652
653 for (i = 0; i < ioat_chan->desc_chunks; i++) {
654 dma_free_coherent(to_dev(ioat_chan), IOAT_CHUNK_SIZE,
655 ioat_chan->descs[i].virt,
656 ioat_chan->descs[i].hw);
657 ioat_chan->descs[i].virt = NULL;
658 ioat_chan->descs[i].hw = 0;
659 }
660 ioat_chan->desc_chunks = 0;
661
662 kfree(ioat_chan->ring);
663 ioat_chan->ring = NULL;
664 ioat_chan->alloc_order = 0;
665 dma_pool_free(ioat_dma->completion_pool, ioat_chan->completion,
666 ioat_chan->completion_dma);
667 spin_unlock_bh(&ioat_chan->prep_lock);
668 spin_unlock_bh(&ioat_chan->cleanup_lock);
669
670 ioat_chan->last_completion = 0;
671 ioat_chan->completion_dma = 0;
672 ioat_chan->dmacount = 0;
673 }
674
675 /* ioat_alloc_chan_resources - allocate/initialize ioat descriptor ring
676 * @chan: channel to be initialized
677 */
678 static int ioat_alloc_chan_resources(struct dma_chan *c)
679 {
680 struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
681 struct ioat_ring_ent **ring;
682 u64 status;
683 int order;
684 int i = 0;
685 u32 chanerr;
686
687 /* have we already been set up? */
688 if (ioat_chan->ring)
689 return 1 << ioat_chan->alloc_order;
690
691 /* Setup register to interrupt and write completion status on error */
692 writew(IOAT_CHANCTRL_RUN, ioat_chan->reg_base + IOAT_CHANCTRL_OFFSET);
693
694 /* allocate a completion writeback area */
695 /* doing 2 32bit writes to mmio since 1 64b write doesn't work */
696 ioat_chan->completion =
697 dma_pool_zalloc(ioat_chan->ioat_dma->completion_pool,
698 GFP_NOWAIT, &ioat_chan->completion_dma);
699 if (!ioat_chan->completion)
700 return -ENOMEM;
701
702 writel(((u64)ioat_chan->completion_dma) & 0x00000000FFFFFFFF,
703 ioat_chan->reg_base + IOAT_CHANCMP_OFFSET_LOW);
704 writel(((u64)ioat_chan->completion_dma) >> 32,
705 ioat_chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH);
706
707 order = IOAT_MAX_ORDER;
708 ring = ioat_alloc_ring(c, order, GFP_NOWAIT);
709 if (!ring)
710 return -ENOMEM;
711
712 spin_lock_bh(&ioat_chan->cleanup_lock);
713 spin_lock_bh(&ioat_chan->prep_lock);
714 ioat_chan->ring = ring;
715 ioat_chan->head = 0;
716 ioat_chan->issued = 0;
717 ioat_chan->tail = 0;
718 ioat_chan->alloc_order = order;
719 set_bit(IOAT_RUN, &ioat_chan->state);
720 spin_unlock_bh(&ioat_chan->prep_lock);
721 spin_unlock_bh(&ioat_chan->cleanup_lock);
722
723 /* Setting up LTR values for 3.4 or later */
724 if (ioat_chan->ioat_dma->version >= IOAT_VER_3_4) {
725 u32 lat_val;
726
727 lat_val = IOAT_CHAN_LTR_ACTIVE_SNVAL |
728 IOAT_CHAN_LTR_ACTIVE_SNLATSCALE |
729 IOAT_CHAN_LTR_ACTIVE_SNREQMNT;
730 writel(lat_val, ioat_chan->reg_base +
731 IOAT_CHAN_LTR_ACTIVE_OFFSET);
732
733 lat_val = IOAT_CHAN_LTR_IDLE_SNVAL |
734 IOAT_CHAN_LTR_IDLE_SNLATSCALE |
735 IOAT_CHAN_LTR_IDLE_SNREQMNT;
736 writel(lat_val, ioat_chan->reg_base +
737 IOAT_CHAN_LTR_IDLE_OFFSET);
738
739 /* Select to active */
740 writeb(IOAT_CHAN_LTR_SWSEL_ACTIVE,
741 ioat_chan->reg_base +
742 IOAT_CHAN_LTR_SWSEL_OFFSET);
743 }
744
745 ioat_start_null_desc(ioat_chan);
746
747 /* check that we got off the ground */
748 do {
749 udelay(1);
750 status = ioat_chansts(ioat_chan);
751 } while (i++ < 20 && !is_ioat_active(status) && !is_ioat_idle(status));
752
753 if (is_ioat_active(status) || is_ioat_idle(status))
754 return 1 << ioat_chan->alloc_order;
755
756 chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
757
758 dev_WARN(to_dev(ioat_chan),
759 "failed to start channel chanerr: %#x\n", chanerr);
760 ioat_free_chan_resources(c);
761 return -EFAULT;
762 }
763
764 /* common channel initialization */
765 static void
766 ioat_init_channel(struct ioatdma_device *ioat_dma,
767 struct ioatdma_chan *ioat_chan, int idx)
768 {
769 struct dma_device *dma = &ioat_dma->dma_dev;
770
771 ioat_chan->ioat_dma = ioat_dma;
772 ioat_chan->reg_base = ioat_dma->reg_base + (0x80 * (idx + 1));
773 spin_lock_init(&ioat_chan->cleanup_lock);
774 ioat_chan->dma_chan.device = dma;
775 dma_cookie_init(&ioat_chan->dma_chan);
776 list_add_tail(&ioat_chan->dma_chan.device_node, &dma->channels);
777 ioat_dma->idx[idx] = ioat_chan;
778 timer_setup(&ioat_chan->timer, ioat_timer_event, 0);
779 tasklet_setup(&ioat_chan->cleanup_task, ioat_cleanup_event);
780 }
781
782 #define IOAT_NUM_SRC_TEST 6 /* must be <= 8 */
783 static int ioat_xor_val_self_test(struct ioatdma_device *ioat_dma)
784 {
785 int i, src_idx;
786 struct page *dest;
787 struct page *xor_srcs[IOAT_NUM_SRC_TEST];
788 struct page *xor_val_srcs[IOAT_NUM_SRC_TEST + 1];
789 dma_addr_t dma_srcs[IOAT_NUM_SRC_TEST + 1];
790 dma_addr_t dest_dma;
791 struct dma_async_tx_descriptor *tx;
792 struct dma_chan *dma_chan;
793 dma_cookie_t cookie;
794 u8 cmp_byte = 0;
795 u32 cmp_word;
796 u32 xor_val_result;
797 int err = 0;
798 struct completion cmp;
799 unsigned long tmo;
800 struct device *dev = &ioat_dma->pdev->dev;
801 struct dma_device *dma = &ioat_dma->dma_dev;
802 u8 op = 0;
803
804 dev_dbg(dev, "%s\n", __func__);
805
806 if (!dma_has_cap(DMA_XOR, dma->cap_mask))
807 return 0;
808
809 for (src_idx = 0; src_idx < IOAT_NUM_SRC_TEST; src_idx++) {
810 xor_srcs[src_idx] = alloc_page(GFP_KERNEL);
811 if (!xor_srcs[src_idx]) {
812 while (src_idx--)
813 __free_page(xor_srcs[src_idx]);
814 return -ENOMEM;
815 }
816 }
817
818 dest = alloc_page(GFP_KERNEL);
819 if (!dest) {
820 while (src_idx--)
821 __free_page(xor_srcs[src_idx]);
822 return -ENOMEM;
823 }
824
825 /* Fill in src buffers */
826 for (src_idx = 0; src_idx < IOAT_NUM_SRC_TEST; src_idx++) {
827 u8 *ptr = page_address(xor_srcs[src_idx]);
828
829 for (i = 0; i < PAGE_SIZE; i++)
830 ptr[i] = (1 << src_idx);
831 }
832
833 for (src_idx = 0; src_idx < IOAT_NUM_SRC_TEST; src_idx++)
834 cmp_byte ^= (u8) (1 << src_idx);
835
836 cmp_word = (cmp_byte << 24) | (cmp_byte << 16) |
837 (cmp_byte << 8) | cmp_byte;
838
839 memset(page_address(dest), 0, PAGE_SIZE);
840
841 dma_chan = container_of(dma->channels.next, struct dma_chan,
842 device_node);
843 if (dma->device_alloc_chan_resources(dma_chan) < 1) {
844 err = -ENODEV;
845 goto out;
846 }
847
848 /* test xor */
849 op = IOAT_OP_XOR;
850
851 dest_dma = dma_map_page(dev, dest, 0, PAGE_SIZE, DMA_FROM_DEVICE);
852 if (dma_mapping_error(dev, dest_dma)) {
853 err = -ENOMEM;
854 goto free_resources;
855 }
856
857 for (i = 0; i < IOAT_NUM_SRC_TEST; i++) {
858 dma_srcs[i] = dma_map_page(dev, xor_srcs[i], 0, PAGE_SIZE,
859 DMA_TO_DEVICE);
860 if (dma_mapping_error(dev, dma_srcs[i])) {
861 err = -ENOMEM;
862 goto dma_unmap;
863 }
864 }
865 tx = dma->device_prep_dma_xor(dma_chan, dest_dma, dma_srcs,
866 IOAT_NUM_SRC_TEST, PAGE_SIZE,
867 DMA_PREP_INTERRUPT);
868
869 if (!tx) {
870 dev_err(dev, "Self-test xor prep failed\n");
871 err = -ENODEV;
872 goto dma_unmap;
873 }
874
875 async_tx_ack(tx);
876 init_completion(&cmp);
877 tx->callback = ioat_dma_test_callback;
878 tx->callback_param = &cmp;
879 cookie = tx->tx_submit(tx);
880 if (cookie < 0) {
881 dev_err(dev, "Self-test xor setup failed\n");
882 err = -ENODEV;
883 goto dma_unmap;
884 }
885 dma->device_issue_pending(dma_chan);
886
887 tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
888
889 if (tmo == 0 ||
890 dma->device_tx_status(dma_chan, cookie, NULL) != DMA_COMPLETE) {
891 dev_err(dev, "Self-test xor timed out\n");
892 err = -ENODEV;
893 goto dma_unmap;
894 }
895
896 for (i = 0; i < IOAT_NUM_SRC_TEST; i++)
897 dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, DMA_TO_DEVICE);
898
899 dma_sync_single_for_cpu(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE);
900 for (i = 0; i < (PAGE_SIZE / sizeof(u32)); i++) {
901 u32 *ptr = page_address(dest);
902
903 if (ptr[i] != cmp_word) {
904 dev_err(dev, "Self-test xor failed compare\n");
905 err = -ENODEV;
906 goto free_resources;
907 }
908 }
909 dma_sync_single_for_device(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE);
910
911 dma_unmap_page(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE);
912
913 /* skip validate if the capability is not present */
914 if (!dma_has_cap(DMA_XOR_VAL, dma_chan->device->cap_mask))
915 goto free_resources;
916
917 op = IOAT_OP_XOR_VAL;
918
919 /* validate the sources with the destintation page */
920 for (i = 0; i < IOAT_NUM_SRC_TEST; i++)
921 xor_val_srcs[i] = xor_srcs[i];
922 xor_val_srcs[i] = dest;
923
924 xor_val_result = 1;
925
926 for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) {
927 dma_srcs[i] = dma_map_page(dev, xor_val_srcs[i], 0, PAGE_SIZE,
928 DMA_TO_DEVICE);
929 if (dma_mapping_error(dev, dma_srcs[i])) {
930 err = -ENOMEM;
931 goto dma_unmap;
932 }
933 }
934 tx = dma->device_prep_dma_xor_val(dma_chan, dma_srcs,
935 IOAT_NUM_SRC_TEST + 1, PAGE_SIZE,
936 &xor_val_result, DMA_PREP_INTERRUPT);
937 if (!tx) {
938 dev_err(dev, "Self-test zero prep failed\n");
939 err = -ENODEV;
940 goto dma_unmap;
941 }
942
943 async_tx_ack(tx);
944 init_completion(&cmp);
945 tx->callback = ioat_dma_test_callback;
946 tx->callback_param = &cmp;
947 cookie = tx->tx_submit(tx);
948 if (cookie < 0) {
949 dev_err(dev, "Self-test zero setup failed\n");
950 err = -ENODEV;
951 goto dma_unmap;
952 }
953 dma->device_issue_pending(dma_chan);
954
955 tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
956
957 if (tmo == 0 ||
958 dma->device_tx_status(dma_chan, cookie, NULL) != DMA_COMPLETE) {
959 dev_err(dev, "Self-test validate timed out\n");
960 err = -ENODEV;
961 goto dma_unmap;
962 }
963
964 for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++)
965 dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, DMA_TO_DEVICE);
966
967 if (xor_val_result != 0) {
968 dev_err(dev, "Self-test validate failed compare\n");
969 err = -ENODEV;
970 goto free_resources;
971 }
972
973 memset(page_address(dest), 0, PAGE_SIZE);
974
975 /* test for non-zero parity sum */
976 op = IOAT_OP_XOR_VAL;
977
978 xor_val_result = 0;
979 for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) {
980 dma_srcs[i] = dma_map_page(dev, xor_val_srcs[i], 0, PAGE_SIZE,
981 DMA_TO_DEVICE);
982 if (dma_mapping_error(dev, dma_srcs[i])) {
983 err = -ENOMEM;
984 goto dma_unmap;
985 }
986 }
987 tx = dma->device_prep_dma_xor_val(dma_chan, dma_srcs,
988 IOAT_NUM_SRC_TEST + 1, PAGE_SIZE,
989 &xor_val_result, DMA_PREP_INTERRUPT);
990 if (!tx) {
991 dev_err(dev, "Self-test 2nd zero prep failed\n");
992 err = -ENODEV;
993 goto dma_unmap;
994 }
995
996 async_tx_ack(tx);
997 init_completion(&cmp);
998 tx->callback = ioat_dma_test_callback;
999 tx->callback_param = &cmp;
1000 cookie = tx->tx_submit(tx);
1001 if (cookie < 0) {
1002 dev_err(dev, "Self-test 2nd zero setup failed\n");
1003 err = -ENODEV;
1004 goto dma_unmap;
1005 }
1006 dma->device_issue_pending(dma_chan);
1007
1008 tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
1009
1010 if (tmo == 0 ||
1011 dma->device_tx_status(dma_chan, cookie, NULL) != DMA_COMPLETE) {
1012 dev_err(dev, "Self-test 2nd validate timed out\n");
1013 err = -ENODEV;
1014 goto dma_unmap;
1015 }
1016
1017 if (xor_val_result != SUM_CHECK_P_RESULT) {
1018 dev_err(dev, "Self-test validate failed compare\n");
1019 err = -ENODEV;
1020 goto dma_unmap;
1021 }
1022
1023 for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++)
1024 dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, DMA_TO_DEVICE);
1025
1026 goto free_resources;
1027 dma_unmap:
1028 if (op == IOAT_OP_XOR) {
1029 while (--i >= 0)
1030 dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE,
1031 DMA_TO_DEVICE);
1032 dma_unmap_page(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE);
1033 } else if (op == IOAT_OP_XOR_VAL) {
1034 while (--i >= 0)
1035 dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE,
1036 DMA_TO_DEVICE);
1037 }
1038 free_resources:
1039 dma->device_free_chan_resources(dma_chan);
1040 out:
1041 src_idx = IOAT_NUM_SRC_TEST;
1042 while (src_idx--)
1043 __free_page(xor_srcs[src_idx]);
1044 __free_page(dest);
1045 return err;
1046 }
1047
1048 static int ioat3_dma_self_test(struct ioatdma_device *ioat_dma)
1049 {
1050 int rc;
1051
1052 rc = ioat_dma_self_test(ioat_dma);
1053 if (rc)
1054 return rc;
1055
1056 rc = ioat_xor_val_self_test(ioat_dma);
1057
1058 return rc;
1059 }
1060
1061 static void ioat_intr_quirk(struct ioatdma_device *ioat_dma)
1062 {
1063 struct dma_device *dma;
1064 struct dma_chan *c;
1065 struct ioatdma_chan *ioat_chan;
1066 u32 errmask;
1067
1068 dma = &ioat_dma->dma_dev;
1069
1070 /*
1071 * if we have descriptor write back error status, we mask the
1072 * error interrupts
1073 */
1074 if (ioat_dma->cap & IOAT_CAP_DWBES) {
1075 list_for_each_entry(c, &dma->channels, device_node) {
1076 ioat_chan = to_ioat_chan(c);
1077 errmask = readl(ioat_chan->reg_base +
1078 IOAT_CHANERR_MASK_OFFSET);
1079 errmask |= IOAT_CHANERR_XOR_P_OR_CRC_ERR |
1080 IOAT_CHANERR_XOR_Q_ERR;
1081 writel(errmask, ioat_chan->reg_base +
1082 IOAT_CHANERR_MASK_OFFSET);
1083 }
1084 }
1085 }
1086
1087 static int ioat3_dma_probe(struct ioatdma_device *ioat_dma, int dca)
1088 {
1089 struct pci_dev *pdev = ioat_dma->pdev;
1090 int dca_en = system_has_dca_enabled(pdev);
1091 struct dma_device *dma;
1092 struct dma_chan *c;
1093 struct ioatdma_chan *ioat_chan;
1094 int err;
1095 u16 val16;
1096
1097 dma = &ioat_dma->dma_dev;
1098 dma->device_prep_dma_memcpy = ioat_dma_prep_memcpy_lock;
1099 dma->device_issue_pending = ioat_issue_pending;
1100 dma->device_alloc_chan_resources = ioat_alloc_chan_resources;
1101 dma->device_free_chan_resources = ioat_free_chan_resources;
1102
1103 dma_cap_set(DMA_INTERRUPT, dma->cap_mask);
1104 dma->device_prep_dma_interrupt = ioat_prep_interrupt_lock;
1105
1106 ioat_dma->cap = readl(ioat_dma->reg_base + IOAT_DMA_CAP_OFFSET);
1107
1108 if (is_xeon_cb32(pdev) || is_bwd_noraid(pdev))
1109 ioat_dma->cap &=
1110 ~(IOAT_CAP_XOR | IOAT_CAP_PQ | IOAT_CAP_RAID16SS);
1111
1112 /* dca is incompatible with raid operations */
1113 if (dca_en && (ioat_dma->cap & (IOAT_CAP_XOR|IOAT_CAP_PQ)))
1114 ioat_dma->cap &= ~(IOAT_CAP_XOR|IOAT_CAP_PQ);
1115
1116 if (ioat_dma->cap & IOAT_CAP_XOR) {
1117 dma->max_xor = 8;
1118
1119 dma_cap_set(DMA_XOR, dma->cap_mask);
1120 dma->device_prep_dma_xor = ioat_prep_xor;
1121
1122 dma_cap_set(DMA_XOR_VAL, dma->cap_mask);
1123 dma->device_prep_dma_xor_val = ioat_prep_xor_val;
1124 }
1125
1126 if (ioat_dma->cap & IOAT_CAP_PQ) {
1127
1128 dma->device_prep_dma_pq = ioat_prep_pq;
1129 dma->device_prep_dma_pq_val = ioat_prep_pq_val;
1130 dma_cap_set(DMA_PQ, dma->cap_mask);
1131 dma_cap_set(DMA_PQ_VAL, dma->cap_mask);
1132
1133 if (ioat_dma->cap & IOAT_CAP_RAID16SS)
1134 dma_set_maxpq(dma, 16, 0);
1135 else
1136 dma_set_maxpq(dma, 8, 0);
1137
1138 if (!(ioat_dma->cap & IOAT_CAP_XOR)) {
1139 dma->device_prep_dma_xor = ioat_prep_pqxor;
1140 dma->device_prep_dma_xor_val = ioat_prep_pqxor_val;
1141 dma_cap_set(DMA_XOR, dma->cap_mask);
1142 dma_cap_set(DMA_XOR_VAL, dma->cap_mask);
1143
1144 if (ioat_dma->cap & IOAT_CAP_RAID16SS)
1145 dma->max_xor = 16;
1146 else
1147 dma->max_xor = 8;
1148 }
1149 }
1150
1151 dma->device_tx_status = ioat_tx_status;
1152
1153 /* starting with CB3.3 super extended descriptors are supported */
1154 if (ioat_dma->cap & IOAT_CAP_RAID16SS) {
1155 char pool_name[14];
1156 int i;
1157
1158 for (i = 0; i < MAX_SED_POOLS; i++) {
1159 snprintf(pool_name, 14, "ioat_hw%d_sed", i);
1160
1161 /* allocate SED DMA pool */
1162 ioat_dma->sed_hw_pool[i] = dmam_pool_create(pool_name,
1163 &pdev->dev,
1164 SED_SIZE * (i + 1), 64, 0);
1165 if (!ioat_dma->sed_hw_pool[i])
1166 return -ENOMEM;
1167
1168 }
1169 }
1170
1171 if (!(ioat_dma->cap & (IOAT_CAP_XOR | IOAT_CAP_PQ)))
1172 dma_cap_set(DMA_PRIVATE, dma->cap_mask);
1173
1174 err = ioat_probe(ioat_dma);
1175 if (err)
1176 return err;
1177
1178 list_for_each_entry(c, &dma->channels, device_node) {
1179 ioat_chan = to_ioat_chan(c);
1180 writel(IOAT_DMA_DCA_ANY_CPU,
1181 ioat_chan->reg_base + IOAT_DCACTRL_OFFSET);
1182 }
1183
1184 err = ioat_register(ioat_dma);
1185 if (err)
1186 return err;
1187
1188 ioat_kobject_add(ioat_dma, &ioat_ktype);
1189
1190 if (dca)
1191 ioat_dma->dca = ioat_dca_init(pdev, ioat_dma->reg_base);
1192
1193 /* disable relaxed ordering */
1194 err = pcie_capability_read_word(pdev, IOAT_DEVCTRL_OFFSET, &val16);
1195 if (err)
1196 return pcibios_err_to_errno(err);
1197
1198 /* clear relaxed ordering enable */
1199 val16 &= ~IOAT_DEVCTRL_ROE;
1200 err = pcie_capability_write_word(pdev, IOAT_DEVCTRL_OFFSET, val16);
1201 if (err)
1202 return pcibios_err_to_errno(err);
1203
1204 if (ioat_dma->cap & IOAT_CAP_DPS)
1205 writeb(ioat_pending_level + 1,
1206 ioat_dma->reg_base + IOAT_PREFETCH_LIMIT_OFFSET);
1207
1208 return 0;
1209 }
1210
1211 static void ioat_shutdown(struct pci_dev *pdev)
1212 {
1213 struct ioatdma_device *ioat_dma = pci_get_drvdata(pdev);
1214 struct ioatdma_chan *ioat_chan;
1215 int i;
1216
1217 if (!ioat_dma)
1218 return;
1219
1220 for (i = 0; i < IOAT_MAX_CHANS; i++) {
1221 ioat_chan = ioat_dma->idx[i];
1222 if (!ioat_chan)
1223 continue;
1224
1225 spin_lock_bh(&ioat_chan->prep_lock);
1226 set_bit(IOAT_CHAN_DOWN, &ioat_chan->state);
1227 spin_unlock_bh(&ioat_chan->prep_lock);
1228 /*
1229 * Synchronization rule for del_timer_sync():
1230 * - The caller must not hold locks which would prevent
1231 * completion of the timer's handler.
1232 * So prep_lock cannot be held before calling it.
1233 */
1234 del_timer_sync(&ioat_chan->timer);
1235
1236 /* this should quiesce then reset */
1237 ioat_reset_hw(ioat_chan);
1238 }
1239
1240 ioat_disable_interrupts(ioat_dma);
1241 }
1242
1243 static void ioat_resume(struct ioatdma_device *ioat_dma)
1244 {
1245 struct ioatdma_chan *ioat_chan;
1246 u32 chanerr;
1247 int i;
1248
1249 for (i = 0; i < IOAT_MAX_CHANS; i++) {
1250 ioat_chan = ioat_dma->idx[i];
1251 if (!ioat_chan)
1252 continue;
1253
1254 spin_lock_bh(&ioat_chan->prep_lock);
1255 clear_bit(IOAT_CHAN_DOWN, &ioat_chan->state);
1256 spin_unlock_bh(&ioat_chan->prep_lock);
1257
1258 chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
1259 writel(chanerr, ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
1260
1261 /* no need to reset as shutdown already did that */
1262 }
1263 }
1264
1265 #define DRV_NAME "ioatdma"
1266
1267 static pci_ers_result_t ioat_pcie_error_detected(struct pci_dev *pdev,
1268 pci_channel_state_t error)
1269 {
1270 dev_dbg(&pdev->dev, "%s: PCIe AER error %d\n", DRV_NAME, error);
1271
1272 /* quiesce and block I/O */
1273 ioat_shutdown(pdev);
1274
1275 return PCI_ERS_RESULT_NEED_RESET;
1276 }
1277
1278 static pci_ers_result_t ioat_pcie_error_slot_reset(struct pci_dev *pdev)
1279 {
1280 pci_ers_result_t result = PCI_ERS_RESULT_RECOVERED;
1281
1282 dev_dbg(&pdev->dev, "%s post reset handling\n", DRV_NAME);
1283
1284 if (pci_enable_device_mem(pdev) < 0) {
1285 dev_err(&pdev->dev,
1286 "Failed to enable PCIe device after reset.\n");
1287 result = PCI_ERS_RESULT_DISCONNECT;
1288 } else {
1289 pci_set_master(pdev);
1290 pci_restore_state(pdev);
1291 pci_save_state(pdev);
1292 pci_wake_from_d3(pdev, false);
1293 }
1294
1295 return result;
1296 }
1297
1298 static void ioat_pcie_error_resume(struct pci_dev *pdev)
1299 {
1300 struct ioatdma_device *ioat_dma = pci_get_drvdata(pdev);
1301
1302 dev_dbg(&pdev->dev, "%s: AER handling resuming\n", DRV_NAME);
1303
1304 /* initialize and bring everything back */
1305 ioat_resume(ioat_dma);
1306 }
1307
1308 static const struct pci_error_handlers ioat_err_handler = {
1309 .error_detected = ioat_pcie_error_detected,
1310 .slot_reset = ioat_pcie_error_slot_reset,
1311 .resume = ioat_pcie_error_resume,
1312 };
1313
1314 static struct pci_driver ioat_pci_driver = {
1315 .name = DRV_NAME,
1316 .id_table = ioat_pci_tbl,
1317 .probe = ioat_pci_probe,
1318 .remove = ioat_remove,
1319 .shutdown = ioat_shutdown,
1320 .err_handler = &ioat_err_handler,
1321 };
1322
1323 static void release_ioatdma(struct dma_device *device)
1324 {
1325 struct ioatdma_device *d = to_ioatdma_device(device);
1326 int i;
1327
1328 for (i = 0; i < IOAT_MAX_CHANS; i++)
1329 kfree(d->idx[i]);
1330
1331 dma_pool_destroy(d->completion_pool);
1332 kfree(d);
1333 }
1334
1335 static struct ioatdma_device *
1336 alloc_ioatdma(struct pci_dev *pdev, void __iomem *iobase)
1337 {
1338 struct ioatdma_device *d = kzalloc(sizeof(*d), GFP_KERNEL);
1339
1340 if (!d)
1341 return NULL;
1342 d->pdev = pdev;
1343 d->reg_base = iobase;
1344 d->dma_dev.device_release = release_ioatdma;
1345 return d;
1346 }
1347
1348 static int ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
1349 {
1350 void __iomem * const *iomap;
1351 struct device *dev = &pdev->dev;
1352 struct ioatdma_device *device;
1353 int err;
1354
1355 err = pcim_enable_device(pdev);
1356 if (err)
1357 return err;
1358
1359 err = pcim_iomap_regions(pdev, 1 << IOAT_MMIO_BAR, DRV_NAME);
1360 if (err)
1361 return err;
1362 iomap = pcim_iomap_table(pdev);
1363 if (!iomap)
1364 return -ENOMEM;
1365
1366 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
1367 if (err)
1368 err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
1369 if (err)
1370 return err;
1371
1372 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
1373 if (err)
1374 err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
1375 if (err)
1376 return err;
1377
1378 device = alloc_ioatdma(pdev, iomap[IOAT_MMIO_BAR]);
1379 if (!device)
1380 return -ENOMEM;
1381 pci_set_master(pdev);
1382 pci_set_drvdata(pdev, device);
1383
1384 device->version = readb(device->reg_base + IOAT_VER_OFFSET);
1385 if (device->version >= IOAT_VER_3_4)
1386 ioat_dca_enabled = 0;
1387 if (device->version >= IOAT_VER_3_0) {
1388 if (is_skx_ioat(pdev))
1389 device->version = IOAT_VER_3_2;
1390 err = ioat3_dma_probe(device, ioat_dca_enabled);
1391
1392 if (device->version >= IOAT_VER_3_3)
1393 pci_enable_pcie_error_reporting(pdev);
1394 } else
1395 return -ENODEV;
1396
1397 if (err) {
1398 dev_err(dev, "Intel(R) I/OAT DMA Engine init failed\n");
1399 pci_disable_pcie_error_reporting(pdev);
1400 return -ENODEV;
1401 }
1402
1403 return 0;
1404 }
1405
1406 static void ioat_remove(struct pci_dev *pdev)
1407 {
1408 struct ioatdma_device *device = pci_get_drvdata(pdev);
1409
1410 if (!device)
1411 return;
1412
1413 ioat_shutdown(pdev);
1414
1415 dev_err(&pdev->dev, "Removing dma and dca services\n");
1416 if (device->dca) {
1417 unregister_dca_provider(device->dca, &pdev->dev);
1418 free_dca_provider(device->dca);
1419 device->dca = NULL;
1420 }
1421
1422 pci_disable_pcie_error_reporting(pdev);
1423 ioat_dma_remove(device);
1424 }
1425
1426 static int __init ioat_init_module(void)
1427 {
1428 int err = -ENOMEM;
1429
1430 pr_info("%s: Intel(R) QuickData Technology Driver %s\n",
1431 DRV_NAME, IOAT_DMA_VERSION);
1432
1433 ioat_cache = kmem_cache_create("ioat", sizeof(struct ioat_ring_ent),
1434 0, SLAB_HWCACHE_ALIGN, NULL);
1435 if (!ioat_cache)
1436 return -ENOMEM;
1437
1438 ioat_sed_cache = KMEM_CACHE(ioat_sed_ent, 0);
1439 if (!ioat_sed_cache)
1440 goto err_ioat_cache;
1441
1442 err = pci_register_driver(&ioat_pci_driver);
1443 if (err)
1444 goto err_ioat3_cache;
1445
1446 return 0;
1447
1448 err_ioat3_cache:
1449 kmem_cache_destroy(ioat_sed_cache);
1450
1451 err_ioat_cache:
1452 kmem_cache_destroy(ioat_cache);
1453
1454 return err;
1455 }
1456 module_init(ioat_init_module);
1457
1458 static void __exit ioat_exit_module(void)
1459 {
1460 pci_unregister_driver(&ioat_pci_driver);
1461 kmem_cache_destroy(ioat_cache);
1462 }
1463 module_exit(ioat_exit_module);
Linux with added FPC-III support