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/sizes.h>
19 #include "dma.h"
20 #include "registers.h"
21 #include "hw.h"
22
23 #include "../dmaengine.h"
24
25 MODULE_VERSION(IOAT_DMA_VERSION);
26 MODULE_LICENSE("Dual BSD/GPL");
27 MODULE_AUTHOR("Intel Corporation");
28
29 static const struct pci_device_id ioat_pci_tbl[] = {
30 /* I/OAT v3 platforms */
31 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG0) },
32 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG1) },
33 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG2) },
34 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG3) },
35 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG4) },
36 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG5) },
37 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG6) },
38 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG7) },
39
40 /* I/OAT v3.2 platforms */
41 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF0) },
42 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF1) },
43 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF2) },
44 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF3) },
45 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF4) },
46 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF5) },
47 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF6) },
48 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF7) },
49 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF8) },
50 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF9) },
51
52 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB0) },
53 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB1) },
54 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB2) },
55 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB3) },
56 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB4) },
57 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB5) },
58 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB6) },
59 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB7) },
60 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB8) },
61 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB9) },
62
63 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB0) },
64 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB1) },
65 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB2) },
66 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB3) },
67 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB4) },
68 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB5) },
69 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB6) },
70 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB7) },
71 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB8) },
72 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB9) },
73
74 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW0) },
75 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW1) },
76 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW2) },
77 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW3) },
78 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW4) },
79 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW5) },
80 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW6) },
81 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW7) },
82 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW8) },
83 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW9) },
84
85 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX0) },
86 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX1) },
87 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX2) },
88 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX3) },
89 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX4) },
90 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX5) },
91 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX6) },
92 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX7) },
93 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX8) },
94 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDX9) },
95
96 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SKX) },
97
98 /* I/OAT v3.3 platforms */
99 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD0) },
100 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD1) },
101 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD2) },
102 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD3) },
103
104 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE0) },
105 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE1) },
106 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE2) },
107 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE3) },
108
109 /* I/OAT v3.4 platforms */
110 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_ICX) },
111
112 { 0, }
113 };
114 MODULE_DEVICE_TABLE(pci, ioat_pci_tbl);
115
116 static int ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id);
117 static void ioat_remove(struct pci_dev *pdev);
118 static void
119 ioat_init_channel(struct ioatdma_device *ioat_dma,
120 struct ioatdma_chan *ioat_chan, int idx);
121 static void ioat_intr_quirk(struct ioatdma_device *ioat_dma);
122 static void ioat_enumerate_channels(struct ioatdma_device *ioat_dma);
123 static int ioat3_dma_self_test(struct ioatdma_device *ioat_dma);
124
125 static int ioat_dca_enabled = 1;
126 module_param(ioat_dca_enabled, int, 0644);
127 MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)");
128 int ioat_pending_level = 7;
129 module_param(ioat_pending_level, int, 0644);
130 MODULE_PARM_DESC(ioat_pending_level,
131 "high-water mark for pushing ioat descriptors (default: 7)");
132 static char ioat_interrupt_style[32] = "msix";
133 module_param_string(ioat_interrupt_style, ioat_interrupt_style,
134 sizeof(ioat_interrupt_style), 0644);
135 MODULE_PARM_DESC(ioat_interrupt_style,
136 "set ioat interrupt style: msix (default), msi, intx");
137
138 struct kmem_cache *ioat_cache;
139 struct kmem_cache *ioat_sed_cache;
140
is_jf_ioat(struct pci_dev * pdev)141 static bool is_jf_ioat(struct pci_dev *pdev)
142 {
143 switch (pdev->device) {
144 case PCI_DEVICE_ID_INTEL_IOAT_JSF0:
145 case PCI_DEVICE_ID_INTEL_IOAT_JSF1:
146 case PCI_DEVICE_ID_INTEL_IOAT_JSF2:
147 case PCI_DEVICE_ID_INTEL_IOAT_JSF3:
148 case PCI_DEVICE_ID_INTEL_IOAT_JSF4:
149 case PCI_DEVICE_ID_INTEL_IOAT_JSF5:
150 case PCI_DEVICE_ID_INTEL_IOAT_JSF6:
151 case PCI_DEVICE_ID_INTEL_IOAT_JSF7:
152 case PCI_DEVICE_ID_INTEL_IOAT_JSF8:
153 case PCI_DEVICE_ID_INTEL_IOAT_JSF9:
154 return true;
155 default:
156 return false;
157 }
158 }
159
is_snb_ioat(struct pci_dev * pdev)160 static bool is_snb_ioat(struct pci_dev *pdev)
161 {
162 switch (pdev->device) {
163 case PCI_DEVICE_ID_INTEL_IOAT_SNB0:
164 case PCI_DEVICE_ID_INTEL_IOAT_SNB1:
165 case PCI_DEVICE_ID_INTEL_IOAT_SNB2:
166 case PCI_DEVICE_ID_INTEL_IOAT_SNB3:
167 case PCI_DEVICE_ID_INTEL_IOAT_SNB4:
168 case PCI_DEVICE_ID_INTEL_IOAT_SNB5:
169 case PCI_DEVICE_ID_INTEL_IOAT_SNB6:
170 case PCI_DEVICE_ID_INTEL_IOAT_SNB7:
171 case PCI_DEVICE_ID_INTEL_IOAT_SNB8:
172 case PCI_DEVICE_ID_INTEL_IOAT_SNB9:
173 return true;
174 default:
175 return false;
176 }
177 }
178
is_ivb_ioat(struct pci_dev * pdev)179 static bool is_ivb_ioat(struct pci_dev *pdev)
180 {
181 switch (pdev->device) {
182 case PCI_DEVICE_ID_INTEL_IOAT_IVB0:
183 case PCI_DEVICE_ID_INTEL_IOAT_IVB1:
184 case PCI_DEVICE_ID_INTEL_IOAT_IVB2:
185 case PCI_DEVICE_ID_INTEL_IOAT_IVB3:
186 case PCI_DEVICE_ID_INTEL_IOAT_IVB4:
187 case PCI_DEVICE_ID_INTEL_IOAT_IVB5:
188 case PCI_DEVICE_ID_INTEL_IOAT_IVB6:
189 case PCI_DEVICE_ID_INTEL_IOAT_IVB7:
190 case PCI_DEVICE_ID_INTEL_IOAT_IVB8:
191 case PCI_DEVICE_ID_INTEL_IOAT_IVB9:
192 return true;
193 default:
194 return false;
195 }
196
197 }
198
is_hsw_ioat(struct pci_dev * pdev)199 static bool is_hsw_ioat(struct pci_dev *pdev)
200 {
201 switch (pdev->device) {
202 case PCI_DEVICE_ID_INTEL_IOAT_HSW0:
203 case PCI_DEVICE_ID_INTEL_IOAT_HSW1:
204 case PCI_DEVICE_ID_INTEL_IOAT_HSW2:
205 case PCI_DEVICE_ID_INTEL_IOAT_HSW3:
206 case PCI_DEVICE_ID_INTEL_IOAT_HSW4:
207 case PCI_DEVICE_ID_INTEL_IOAT_HSW5:
208 case PCI_DEVICE_ID_INTEL_IOAT_HSW6:
209 case PCI_DEVICE_ID_INTEL_IOAT_HSW7:
210 case PCI_DEVICE_ID_INTEL_IOAT_HSW8:
211 case PCI_DEVICE_ID_INTEL_IOAT_HSW9:
212 return true;
213 default:
214 return false;
215 }
216
217 }
218
is_bdx_ioat(struct pci_dev * pdev)219 static bool is_bdx_ioat(struct pci_dev *pdev)
220 {
221 switch (pdev->device) {
222 case PCI_DEVICE_ID_INTEL_IOAT_BDX0:
223 case PCI_DEVICE_ID_INTEL_IOAT_BDX1:
224 case PCI_DEVICE_ID_INTEL_IOAT_BDX2:
225 case PCI_DEVICE_ID_INTEL_IOAT_BDX3:
226 case PCI_DEVICE_ID_INTEL_IOAT_BDX4:
227 case PCI_DEVICE_ID_INTEL_IOAT_BDX5:
228 case PCI_DEVICE_ID_INTEL_IOAT_BDX6:
229 case PCI_DEVICE_ID_INTEL_IOAT_BDX7:
230 case PCI_DEVICE_ID_INTEL_IOAT_BDX8:
231 case PCI_DEVICE_ID_INTEL_IOAT_BDX9:
232 return true;
233 default:
234 return false;
235 }
236 }
237
is_skx_ioat(struct pci_dev * pdev)238 static inline bool is_skx_ioat(struct pci_dev *pdev)
239 {
240 return (pdev->device == PCI_DEVICE_ID_INTEL_IOAT_SKX) ? true : false;
241 }
242
is_xeon_cb32(struct pci_dev * pdev)243 static bool is_xeon_cb32(struct pci_dev *pdev)
244 {
245 return is_jf_ioat(pdev) || is_snb_ioat(pdev) || is_ivb_ioat(pdev) ||
246 is_hsw_ioat(pdev) || is_bdx_ioat(pdev) || is_skx_ioat(pdev);
247 }
248
is_bwd_ioat(struct pci_dev * pdev)249 bool is_bwd_ioat(struct pci_dev *pdev)
250 {
251 switch (pdev->device) {
252 case PCI_DEVICE_ID_INTEL_IOAT_BWD0:
253 case PCI_DEVICE_ID_INTEL_IOAT_BWD1:
254 case PCI_DEVICE_ID_INTEL_IOAT_BWD2:
255 case PCI_DEVICE_ID_INTEL_IOAT_BWD3:
256 /* even though not Atom, BDX-DE has same DMA silicon */
257 case PCI_DEVICE_ID_INTEL_IOAT_BDXDE0:
258 case PCI_DEVICE_ID_INTEL_IOAT_BDXDE1:
259 case PCI_DEVICE_ID_INTEL_IOAT_BDXDE2:
260 case PCI_DEVICE_ID_INTEL_IOAT_BDXDE3:
261 return true;
262 default:
263 return false;
264 }
265 }
266
is_bwd_noraid(struct pci_dev * pdev)267 static bool is_bwd_noraid(struct pci_dev *pdev)
268 {
269 switch (pdev->device) {
270 case PCI_DEVICE_ID_INTEL_IOAT_BWD2:
271 case PCI_DEVICE_ID_INTEL_IOAT_BWD3:
272 case PCI_DEVICE_ID_INTEL_IOAT_BDXDE0:
273 case PCI_DEVICE_ID_INTEL_IOAT_BDXDE1:
274 case PCI_DEVICE_ID_INTEL_IOAT_BDXDE2:
275 case PCI_DEVICE_ID_INTEL_IOAT_BDXDE3:
276 return true;
277 default:
278 return false;
279 }
280
281 }
282
283 /*
284 * Perform a IOAT transaction to verify the HW works.
285 */
286 #define IOAT_TEST_SIZE 2000
287
ioat_dma_test_callback(void * dma_async_param)288 static void ioat_dma_test_callback(void *dma_async_param)
289 {
290 struct completion *cmp = dma_async_param;
291
292 complete(cmp);
293 }
294
295 /**
296 * ioat_dma_self_test - Perform a IOAT transaction to verify the HW works.
297 * @ioat_dma: dma device to be tested
298 */
ioat_dma_self_test(struct ioatdma_device * ioat_dma)299 static int ioat_dma_self_test(struct ioatdma_device *ioat_dma)
300 {
301 int i;
302 u8 *src;
303 u8 *dest;
304 struct dma_device *dma = &ioat_dma->dma_dev;
305 struct device *dev = &ioat_dma->pdev->dev;
306 struct dma_chan *dma_chan;
307 struct dma_async_tx_descriptor *tx;
308 dma_addr_t dma_dest, dma_src;
309 dma_cookie_t cookie;
310 int err = 0;
311 struct completion cmp;
312 unsigned long tmo;
313 unsigned long flags;
314
315 src = kzalloc(IOAT_TEST_SIZE, GFP_KERNEL);
316 if (!src)
317 return -ENOMEM;
318 dest = kzalloc(IOAT_TEST_SIZE, GFP_KERNEL);
319 if (!dest) {
320 kfree(src);
321 return -ENOMEM;
322 }
323
324 /* Fill in src buffer */
325 for (i = 0; i < IOAT_TEST_SIZE; i++)
326 src[i] = (u8)i;
327
328 /* Start copy, using first DMA channel */
329 dma_chan = container_of(dma->channels.next, struct dma_chan,
330 device_node);
331 if (dma->device_alloc_chan_resources(dma_chan) < 1) {
332 dev_err(dev, "selftest cannot allocate chan resource\n");
333 err = -ENODEV;
334 goto out;
335 }
336
337 dma_src = dma_map_single(dev, src, IOAT_TEST_SIZE, DMA_TO_DEVICE);
338 if (dma_mapping_error(dev, dma_src)) {
339 dev_err(dev, "mapping src buffer failed\n");
340 err = -ENOMEM;
341 goto free_resources;
342 }
343 dma_dest = dma_map_single(dev, dest, IOAT_TEST_SIZE, DMA_FROM_DEVICE);
344 if (dma_mapping_error(dev, dma_dest)) {
345 dev_err(dev, "mapping dest buffer failed\n");
346 err = -ENOMEM;
347 goto unmap_src;
348 }
349 flags = DMA_PREP_INTERRUPT;
350 tx = ioat_dma->dma_dev.device_prep_dma_memcpy(dma_chan, dma_dest,
351 dma_src, IOAT_TEST_SIZE,
352 flags);
353 if (!tx) {
354 dev_err(dev, "Self-test prep failed, disabling\n");
355 err = -ENODEV;
356 goto unmap_dma;
357 }
358
359 async_tx_ack(tx);
360 init_completion(&cmp);
361 tx->callback = ioat_dma_test_callback;
362 tx->callback_param = &cmp;
363 cookie = tx->tx_submit(tx);
364 if (cookie < 0) {
365 dev_err(dev, "Self-test setup failed, disabling\n");
366 err = -ENODEV;
367 goto unmap_dma;
368 }
369 dma->device_issue_pending(dma_chan);
370
371 tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
372
373 if (tmo == 0 ||
374 dma->device_tx_status(dma_chan, cookie, NULL)
375 != DMA_COMPLETE) {
376 dev_err(dev, "Self-test copy timed out, disabling\n");
377 err = -ENODEV;
378 goto unmap_dma;
379 }
380 if (memcmp(src, dest, IOAT_TEST_SIZE)) {
381 dev_err(dev, "Self-test copy failed compare, disabling\n");
382 err = -ENODEV;
383 goto unmap_dma;
384 }
385
386 unmap_dma:
387 dma_unmap_single(dev, dma_dest, IOAT_TEST_SIZE, DMA_FROM_DEVICE);
388 unmap_src:
389 dma_unmap_single(dev, dma_src, IOAT_TEST_SIZE, DMA_TO_DEVICE);
390 free_resources:
391 dma->device_free_chan_resources(dma_chan);
392 out:
393 kfree(src);
394 kfree(dest);
395 return err;
396 }
397
398 /**
399 * ioat_dma_setup_interrupts - setup interrupt handler
400 * @ioat_dma: ioat dma device
401 */
ioat_dma_setup_interrupts(struct ioatdma_device * ioat_dma)402 int ioat_dma_setup_interrupts(struct ioatdma_device *ioat_dma)
403 {
404 struct ioatdma_chan *ioat_chan;
405 struct pci_dev *pdev = ioat_dma->pdev;
406 struct device *dev = &pdev->dev;
407 struct msix_entry *msix;
408 int i, j, msixcnt;
409 int err = -EINVAL;
410 u8 intrctrl = 0;
411
412 if (!strcmp(ioat_interrupt_style, "msix"))
413 goto msix;
414 if (!strcmp(ioat_interrupt_style, "msi"))
415 goto msi;
416 if (!strcmp(ioat_interrupt_style, "intx"))
417 goto intx;
418 dev_err(dev, "invalid ioat_interrupt_style %s\n", ioat_interrupt_style);
419 goto err_no_irq;
420
421 msix:
422 /* The number of MSI-X vectors should equal the number of channels */
423 msixcnt = ioat_dma->chancnt;
424 for (i = 0; i < msixcnt; i++)
425 ioat_dma->msix_entries[i].entry = i;
426
427 err = pci_enable_msix_exact(pdev, ioat_dma->msix_entries, msixcnt);
428 if (err)
429 goto msi;
430
431 for (i = 0; i < msixcnt; i++) {
432 msix = &ioat_dma->msix_entries[i];
433 ioat_chan = ioat_chan_by_index(ioat_dma, i);
434 err = devm_request_irq(dev, msix->vector,
435 ioat_dma_do_interrupt_msix, 0,
436 "ioat-msix", ioat_chan);
437 if (err) {
438 for (j = 0; j < i; j++) {
439 msix = &ioat_dma->msix_entries[j];
440 ioat_chan = ioat_chan_by_index(ioat_dma, j);
441 devm_free_irq(dev, msix->vector, ioat_chan);
442 }
443 goto msi;
444 }
445 }
446 intrctrl |= IOAT_INTRCTRL_MSIX_VECTOR_CONTROL;
447 ioat_dma->irq_mode = IOAT_MSIX;
448 goto done;
449
450 msi:
451 err = pci_enable_msi(pdev);
452 if (err)
453 goto intx;
454
455 err = devm_request_irq(dev, pdev->irq, ioat_dma_do_interrupt, 0,
456 "ioat-msi", ioat_dma);
457 if (err) {
458 pci_disable_msi(pdev);
459 goto intx;
460 }
461 ioat_dma->irq_mode = IOAT_MSI;
462 goto done;
463
464 intx:
465 err = devm_request_irq(dev, pdev->irq, ioat_dma_do_interrupt,
466 IRQF_SHARED, "ioat-intx", ioat_dma);
467 if (err)
468 goto err_no_irq;
469
470 ioat_dma->irq_mode = IOAT_INTX;
471 done:
472 if (is_bwd_ioat(pdev))
473 ioat_intr_quirk(ioat_dma);
474 intrctrl |= IOAT_INTRCTRL_MASTER_INT_EN;
475 writeb(intrctrl, ioat_dma->reg_base + IOAT_INTRCTRL_OFFSET);
476 return 0;
477
478 err_no_irq:
479 /* Disable all interrupt generation */
480 writeb(0, ioat_dma->reg_base + IOAT_INTRCTRL_OFFSET);
481 ioat_dma->irq_mode = IOAT_NOIRQ;
482 dev_err(dev, "no usable interrupts\n");
483 return err;
484 }
485
ioat_disable_interrupts(struct ioatdma_device * ioat_dma)486 static void ioat_disable_interrupts(struct ioatdma_device *ioat_dma)
487 {
488 /* Disable all interrupt generation */
489 writeb(0, ioat_dma->reg_base + IOAT_INTRCTRL_OFFSET);
490 }
491
ioat_probe(struct ioatdma_device * ioat_dma)492 static int ioat_probe(struct ioatdma_device *ioat_dma)
493 {
494 int err = -ENODEV;
495 struct dma_device *dma = &ioat_dma->dma_dev;
496 struct pci_dev *pdev = ioat_dma->pdev;
497 struct device *dev = &pdev->dev;
498
499 ioat_dma->completion_pool = dma_pool_create("completion_pool", dev,
500 sizeof(u64),
501 SMP_CACHE_BYTES,
502 SMP_CACHE_BYTES);
503
504 if (!ioat_dma->completion_pool) {
505 err = -ENOMEM;
506 goto err_out;
507 }
508
509 ioat_enumerate_channels(ioat_dma);
510
511 dma_cap_set(DMA_MEMCPY, dma->cap_mask);
512 dma->dev = &pdev->dev;
513
514 if (!ioat_dma->chancnt) {
515 dev_err(dev, "channel enumeration error\n");
516 goto err_setup_interrupts;
517 }
518
519 err = ioat_dma_setup_interrupts(ioat_dma);
520 if (err)
521 goto err_setup_interrupts;
522
523 err = ioat3_dma_self_test(ioat_dma);
524 if (err)
525 goto err_self_test;
526
527 return 0;
528
529 err_self_test:
530 ioat_disable_interrupts(ioat_dma);
531 err_setup_interrupts:
532 dma_pool_destroy(ioat_dma->completion_pool);
533 err_out:
534 return err;
535 }
536
ioat_register(struct ioatdma_device * ioat_dma)537 static int ioat_register(struct ioatdma_device *ioat_dma)
538 {
539 int err = dma_async_device_register(&ioat_dma->dma_dev);
540
541 if (err) {
542 ioat_disable_interrupts(ioat_dma);
543 dma_pool_destroy(ioat_dma->completion_pool);
544 }
545
546 return err;
547 }
548
ioat_dma_remove(struct ioatdma_device * ioat_dma)549 static void ioat_dma_remove(struct ioatdma_device *ioat_dma)
550 {
551 struct dma_device *dma = &ioat_dma->dma_dev;
552
553 ioat_disable_interrupts(ioat_dma);
554
555 ioat_kobject_del(ioat_dma);
556
557 dma_async_device_unregister(dma);
558 }
559
560 /**
561 * ioat_enumerate_channels - find and initialize the device's channels
562 * @ioat_dma: the ioat dma device to be enumerated
563 */
ioat_enumerate_channels(struct ioatdma_device * ioat_dma)564 static void ioat_enumerate_channels(struct ioatdma_device *ioat_dma)
565 {
566 struct ioatdma_chan *ioat_chan;
567 struct device *dev = &ioat_dma->pdev->dev;
568 struct dma_device *dma = &ioat_dma->dma_dev;
569 u8 xfercap_log;
570 int chancnt;
571 int i;
572
573 INIT_LIST_HEAD(&dma->channels);
574 chancnt = readb(ioat_dma->reg_base + IOAT_CHANCNT_OFFSET);
575 chancnt &= 0x1f; /* bits [4:0] valid */
576 if (chancnt > ARRAY_SIZE(ioat_dma->idx)) {
577 dev_warn(dev, "(%d) exceeds max supported channels (%zu)\n",
578 chancnt, ARRAY_SIZE(ioat_dma->idx));
579 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 < 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 ioat_dma->chancnt = i;
601 }
602
603 /**
604 * ioat_free_chan_resources - release all the descriptors
605 * @c: the channel to be cleaned
606 */
ioat_free_chan_resources(struct dma_chan * c)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 */
ioat_alloc_chan_resources(struct dma_chan * c)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
ioat_init_channel(struct ioatdma_device * ioat_dma,struct ioatdma_chan * ioat_chan,int idx)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 */
ioat_xor_val_self_test(struct ioatdma_device * ioat_dma)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
ioat3_dma_self_test(struct ioatdma_device * ioat_dma)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
ioat_intr_quirk(struct ioatdma_device * ioat_dma)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
ioat3_dma_probe(struct ioatdma_device * ioat_dma,int dca)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, PCI_EXP_DEVCTL, &val16);
1195 if (err)
1196 return pcibios_err_to_errno(err);
1197
1198 /* clear relaxed ordering enable */
1199 val16 &= ~PCI_EXP_DEVCTL_RELAX_EN;
1200 err = pcie_capability_write_word(pdev, PCI_EXP_DEVCTL, 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
ioat_shutdown(struct pci_dev * pdev)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
ioat_resume(struct ioatdma_device * ioat_dma)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
ioat_pcie_error_detected(struct pci_dev * pdev,pci_channel_state_t error)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
ioat_pcie_error_slot_reset(struct pci_dev * pdev)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
ioat_pcie_error_resume(struct pci_dev * pdev)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
release_ioatdma(struct dma_device * device)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 *
alloc_ioatdma(struct pci_dev * pdev,void __iomem * iobase)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
ioat_pci_probe(struct pci_dev * pdev,const struct pci_device_id * id)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 = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
1367 if (err)
1368 return err;
1369
1370 device = alloc_ioatdma(pdev, iomap[IOAT_MMIO_BAR]);
1371 if (!device)
1372 return -ENOMEM;
1373 pci_set_master(pdev);
1374 pci_set_drvdata(pdev, device);
1375
1376 device->version = readb(device->reg_base + IOAT_VER_OFFSET);
1377 if (device->version >= IOAT_VER_3_4)
1378 ioat_dca_enabled = 0;
1379 if (device->version >= IOAT_VER_3_0) {
1380 if (is_skx_ioat(pdev))
1381 device->version = IOAT_VER_3_2;
1382 err = ioat3_dma_probe(device, ioat_dca_enabled);
1383 } else
1384 return -ENODEV;
1385
1386 if (err) {
1387 dev_err(dev, "Intel(R) I/OAT DMA Engine init failed\n");
1388 return -ENODEV;
1389 }
1390
1391 return 0;
1392 }
1393
ioat_remove(struct pci_dev * pdev)1394 static void ioat_remove(struct pci_dev *pdev)
1395 {
1396 struct ioatdma_device *device = pci_get_drvdata(pdev);
1397
1398 if (!device)
1399 return;
1400
1401 ioat_shutdown(pdev);
1402
1403 dev_err(&pdev->dev, "Removing dma and dca services\n");
1404 if (device->dca) {
1405 unregister_dca_provider(device->dca, &pdev->dev);
1406 free_dca_provider(device->dca);
1407 device->dca = NULL;
1408 }
1409
1410 ioat_dma_remove(device);
1411 }
1412
ioat_init_module(void)1413 static int __init ioat_init_module(void)
1414 {
1415 int err = -ENOMEM;
1416
1417 pr_info("%s: Intel(R) QuickData Technology Driver %s\n",
1418 DRV_NAME, IOAT_DMA_VERSION);
1419
1420 ioat_cache = kmem_cache_create("ioat", sizeof(struct ioat_ring_ent),
1421 0, SLAB_HWCACHE_ALIGN, NULL);
1422 if (!ioat_cache)
1423 return -ENOMEM;
1424
1425 ioat_sed_cache = KMEM_CACHE(ioat_sed_ent, 0);
1426 if (!ioat_sed_cache)
1427 goto err_ioat_cache;
1428
1429 err = pci_register_driver(&ioat_pci_driver);
1430 if (err)
1431 goto err_ioat3_cache;
1432
1433 return 0;
1434
1435 err_ioat3_cache:
1436 kmem_cache_destroy(ioat_sed_cache);
1437
1438 err_ioat_cache:
1439 kmem_cache_destroy(ioat_cache);
1440
1441 return err;
1442 }
1443 module_init(ioat_init_module);
1444
ioat_exit_module(void)1445 static void __exit ioat_exit_module(void)
1446 {
1447 pci_unregister_driver(&ioat_pci_driver);
1448 kmem_cache_destroy(ioat_cache);
1449 }
1450 module_exit(ioat_exit_module);
1451
