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_DESCRIPTION("Intel I/OAT DMA Linux driver");
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
is_jf_ioat(struct pci_dev * pdev)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
is_snb_ioat(struct pci_dev * pdev)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
is_ivb_ioat(struct pci_dev * pdev)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
is_hsw_ioat(struct pci_dev * pdev)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
is_bdx_ioat(struct pci_dev * pdev)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
is_skx_ioat(struct pci_dev * pdev)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
is_xeon_cb32(struct pci_dev * pdev)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
is_bwd_ioat(struct pci_dev * pdev)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
is_bwd_noraid(struct pci_dev * pdev)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
ioat_dma_test_callback(void * dma_async_param)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 */
ioat_dma_self_test(struct ioatdma_device * ioat_dma)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 */
ioat_dma_setup_interrupts(struct ioatdma_device * ioat_dma)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->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
ioat_disable_interrupts(struct ioatdma_device * ioat_dma)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
ioat_probe(struct ioatdma_device * ioat_dma)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 (!ioat_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
ioat_dma_remove(struct ioatdma_device * ioat_dma)538 static void ioat_dma_remove(struct ioatdma_device *ioat_dma)
539 {
540 struct dma_device *dma = &ioat_dma->dma_dev;
541
542 ioat_disable_interrupts(ioat_dma);
543
544 ioat_kobject_del(ioat_dma);
545
546 dma_async_device_unregister(dma);
547 }
548
549 /**
550 * ioat_enumerate_channels - find and initialize the device's channels
551 * @ioat_dma: the ioat dma device to be enumerated
552 */
ioat_enumerate_channels(struct ioatdma_device * ioat_dma)553 static void ioat_enumerate_channels(struct ioatdma_device *ioat_dma)
554 {
555 struct ioatdma_chan *ioat_chan;
556 struct device *dev = &ioat_dma->pdev->dev;
557 struct dma_device *dma = &ioat_dma->dma_dev;
558 u8 xfercap_log;
559 int chancnt;
560 int i;
561
562 INIT_LIST_HEAD(&dma->channels);
563 chancnt = readb(ioat_dma->reg_base + IOAT_CHANCNT_OFFSET);
564 chancnt &= 0x1f; /* bits [4:0] valid */
565 if (chancnt > ARRAY_SIZE(ioat_dma->idx)) {
566 dev_warn(dev, "(%d) exceeds max supported channels (%zu)\n",
567 chancnt, ARRAY_SIZE(ioat_dma->idx));
568 chancnt = ARRAY_SIZE(ioat_dma->idx);
569 }
570 xfercap_log = readb(ioat_dma->reg_base + IOAT_XFERCAP_OFFSET);
571 xfercap_log &= 0x1f; /* bits [4:0] valid */
572 if (xfercap_log == 0)
573 return;
574 dev_dbg(dev, "%s: xfercap = %d\n", __func__, 1 << xfercap_log);
575
576 for (i = 0; i < chancnt; i++) {
577 ioat_chan = kzalloc(sizeof(*ioat_chan), GFP_KERNEL);
578 if (!ioat_chan)
579 break;
580
581 ioat_init_channel(ioat_dma, ioat_chan, i);
582 ioat_chan->xfercap_log = xfercap_log;
583 spin_lock_init(&ioat_chan->prep_lock);
584 if (ioat_reset_hw(ioat_chan)) {
585 i = 0;
586 break;
587 }
588 }
589 ioat_dma->chancnt = i;
590 }
591
592 /**
593 * ioat_free_chan_resources - release all the descriptors
594 * @c: the channel to be cleaned
595 */
ioat_free_chan_resources(struct dma_chan * c)596 static void ioat_free_chan_resources(struct dma_chan *c)
597 {
598 struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
599 struct ioatdma_device *ioat_dma = ioat_chan->ioat_dma;
600 struct ioat_ring_ent *desc;
601 const int total_descs = 1 << ioat_chan->alloc_order;
602 int descs;
603 int i;
604
605 /* Before freeing channel resources first check
606 * if they have been previously allocated for this channel.
607 */
608 if (!ioat_chan->ring)
609 return;
610
611 ioat_stop(ioat_chan);
612
613 if (!test_bit(IOAT_CHAN_DOWN, &ioat_chan->state)) {
614 ioat_reset_hw(ioat_chan);
615
616 /* Put LTR to idle */
617 if (ioat_dma->version >= IOAT_VER_3_4)
618 writeb(IOAT_CHAN_LTR_SWSEL_IDLE,
619 ioat_chan->reg_base +
620 IOAT_CHAN_LTR_SWSEL_OFFSET);
621 }
622
623 spin_lock_bh(&ioat_chan->cleanup_lock);
624 spin_lock_bh(&ioat_chan->prep_lock);
625 descs = ioat_ring_space(ioat_chan);
626 dev_dbg(to_dev(ioat_chan), "freeing %d idle descriptors\n", descs);
627 for (i = 0; i < descs; i++) {
628 desc = ioat_get_ring_ent(ioat_chan, ioat_chan->head + i);
629 ioat_free_ring_ent(desc, c);
630 }
631
632 if (descs < total_descs)
633 dev_err(to_dev(ioat_chan), "Freeing %d in use descriptors!\n",
634 total_descs - descs);
635
636 for (i = 0; i < total_descs - descs; i++) {
637 desc = ioat_get_ring_ent(ioat_chan, ioat_chan->tail + i);
638 dump_desc_dbg(ioat_chan, desc);
639 ioat_free_ring_ent(desc, c);
640 }
641
642 for (i = 0; i < ioat_chan->desc_chunks; i++) {
643 dma_free_coherent(to_dev(ioat_chan), IOAT_CHUNK_SIZE,
644 ioat_chan->descs[i].virt,
645 ioat_chan->descs[i].hw);
646 ioat_chan->descs[i].virt = NULL;
647 ioat_chan->descs[i].hw = 0;
648 }
649 ioat_chan->desc_chunks = 0;
650
651 kfree(ioat_chan->ring);
652 ioat_chan->ring = NULL;
653 ioat_chan->alloc_order = 0;
654 dma_pool_free(ioat_dma->completion_pool, ioat_chan->completion,
655 ioat_chan->completion_dma);
656 spin_unlock_bh(&ioat_chan->prep_lock);
657 spin_unlock_bh(&ioat_chan->cleanup_lock);
658
659 ioat_chan->last_completion = 0;
660 ioat_chan->completion_dma = 0;
661 ioat_chan->dmacount = 0;
662 }
663
664 /* ioat_alloc_chan_resources - allocate/initialize ioat descriptor ring
665 * @chan: channel to be initialized
666 */
ioat_alloc_chan_resources(struct dma_chan * c)667 static int ioat_alloc_chan_resources(struct dma_chan *c)
668 {
669 struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
670 struct ioat_ring_ent **ring;
671 u64 status;
672 int order;
673 int i = 0;
674 u32 chanerr;
675
676 /* have we already been set up? */
677 if (ioat_chan->ring)
678 return 1 << ioat_chan->alloc_order;
679
680 /* Setup register to interrupt and write completion status on error */
681 writew(IOAT_CHANCTRL_RUN, ioat_chan->reg_base + IOAT_CHANCTRL_OFFSET);
682
683 /* allocate a completion writeback area */
684 /* doing 2 32bit writes to mmio since 1 64b write doesn't work */
685 ioat_chan->completion =
686 dma_pool_zalloc(ioat_chan->ioat_dma->completion_pool,
687 GFP_NOWAIT, &ioat_chan->completion_dma);
688 if (!ioat_chan->completion)
689 return -ENOMEM;
690
691 writel(((u64)ioat_chan->completion_dma) & 0x00000000FFFFFFFF,
692 ioat_chan->reg_base + IOAT_CHANCMP_OFFSET_LOW);
693 writel(((u64)ioat_chan->completion_dma) >> 32,
694 ioat_chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH);
695
696 order = IOAT_MAX_ORDER;
697 ring = ioat_alloc_ring(c, order, GFP_NOWAIT);
698 if (!ring)
699 return -ENOMEM;
700
701 spin_lock_bh(&ioat_chan->cleanup_lock);
702 spin_lock_bh(&ioat_chan->prep_lock);
703 ioat_chan->ring = ring;
704 ioat_chan->head = 0;
705 ioat_chan->issued = 0;
706 ioat_chan->tail = 0;
707 ioat_chan->alloc_order = order;
708 set_bit(IOAT_RUN, &ioat_chan->state);
709 spin_unlock_bh(&ioat_chan->prep_lock);
710 spin_unlock_bh(&ioat_chan->cleanup_lock);
711
712 /* Setting up LTR values for 3.4 or later */
713 if (ioat_chan->ioat_dma->version >= IOAT_VER_3_4) {
714 u32 lat_val;
715
716 lat_val = IOAT_CHAN_LTR_ACTIVE_SNVAL |
717 IOAT_CHAN_LTR_ACTIVE_SNLATSCALE |
718 IOAT_CHAN_LTR_ACTIVE_SNREQMNT;
719 writel(lat_val, ioat_chan->reg_base +
720 IOAT_CHAN_LTR_ACTIVE_OFFSET);
721
722 lat_val = IOAT_CHAN_LTR_IDLE_SNVAL |
723 IOAT_CHAN_LTR_IDLE_SNLATSCALE |
724 IOAT_CHAN_LTR_IDLE_SNREQMNT;
725 writel(lat_val, ioat_chan->reg_base +
726 IOAT_CHAN_LTR_IDLE_OFFSET);
727
728 /* Select to active */
729 writeb(IOAT_CHAN_LTR_SWSEL_ACTIVE,
730 ioat_chan->reg_base +
731 IOAT_CHAN_LTR_SWSEL_OFFSET);
732 }
733
734 ioat_start_null_desc(ioat_chan);
735
736 /* check that we got off the ground */
737 do {
738 udelay(1);
739 status = ioat_chansts(ioat_chan);
740 } while (i++ < 20 && !is_ioat_active(status) && !is_ioat_idle(status));
741
742 if (is_ioat_active(status) || is_ioat_idle(status))
743 return 1 << ioat_chan->alloc_order;
744
745 chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
746
747 dev_WARN(to_dev(ioat_chan),
748 "failed to start channel chanerr: %#x\n", chanerr);
749 ioat_free_chan_resources(c);
750 return -EFAULT;
751 }
752
753 /* common channel initialization */
754 static void
ioat_init_channel(struct ioatdma_device * ioat_dma,struct ioatdma_chan * ioat_chan,int idx)755 ioat_init_channel(struct ioatdma_device *ioat_dma,
756 struct ioatdma_chan *ioat_chan, int idx)
757 {
758 struct dma_device *dma = &ioat_dma->dma_dev;
759
760 ioat_chan->ioat_dma = ioat_dma;
761 ioat_chan->reg_base = ioat_dma->reg_base + (0x80 * (idx + 1));
762 spin_lock_init(&ioat_chan->cleanup_lock);
763 ioat_chan->dma_chan.device = dma;
764 dma_cookie_init(&ioat_chan->dma_chan);
765 list_add_tail(&ioat_chan->dma_chan.device_node, &dma->channels);
766 ioat_dma->idx[idx] = ioat_chan;
767 timer_setup(&ioat_chan->timer, ioat_timer_event, 0);
768 tasklet_setup(&ioat_chan->cleanup_task, ioat_cleanup_event);
769 }
770
771 #define IOAT_NUM_SRC_TEST 6 /* must be <= 8 */
ioat_xor_val_self_test(struct ioatdma_device * ioat_dma)772 static int ioat_xor_val_self_test(struct ioatdma_device *ioat_dma)
773 {
774 int i, src_idx;
775 struct page *dest;
776 struct page *xor_srcs[IOAT_NUM_SRC_TEST];
777 struct page *xor_val_srcs[IOAT_NUM_SRC_TEST + 1];
778 dma_addr_t dma_srcs[IOAT_NUM_SRC_TEST + 1];
779 dma_addr_t dest_dma;
780 struct dma_async_tx_descriptor *tx;
781 struct dma_chan *dma_chan;
782 dma_cookie_t cookie;
783 u8 cmp_byte = 0;
784 u32 cmp_word;
785 u32 xor_val_result;
786 int err = 0;
787 struct completion cmp;
788 unsigned long tmo;
789 struct device *dev = &ioat_dma->pdev->dev;
790 struct dma_device *dma = &ioat_dma->dma_dev;
791 u8 op = 0;
792
793 dev_dbg(dev, "%s\n", __func__);
794
795 if (!dma_has_cap(DMA_XOR, dma->cap_mask))
796 return 0;
797
798 for (src_idx = 0; src_idx < IOAT_NUM_SRC_TEST; src_idx++) {
799 xor_srcs[src_idx] = alloc_page(GFP_KERNEL);
800 if (!xor_srcs[src_idx]) {
801 while (src_idx--)
802 __free_page(xor_srcs[src_idx]);
803 return -ENOMEM;
804 }
805 }
806
807 dest = alloc_page(GFP_KERNEL);
808 if (!dest) {
809 while (src_idx--)
810 __free_page(xor_srcs[src_idx]);
811 return -ENOMEM;
812 }
813
814 /* Fill in src buffers */
815 for (src_idx = 0; src_idx < IOAT_NUM_SRC_TEST; src_idx++) {
816 u8 *ptr = page_address(xor_srcs[src_idx]);
817
818 for (i = 0; i < PAGE_SIZE; i++)
819 ptr[i] = (1 << src_idx);
820 }
821
822 for (src_idx = 0; src_idx < IOAT_NUM_SRC_TEST; src_idx++)
823 cmp_byte ^= (u8) (1 << src_idx);
824
825 cmp_word = (cmp_byte << 24) | (cmp_byte << 16) |
826 (cmp_byte << 8) | cmp_byte;
827
828 memset(page_address(dest), 0, PAGE_SIZE);
829
830 dma_chan = container_of(dma->channels.next, struct dma_chan,
831 device_node);
832 if (dma->device_alloc_chan_resources(dma_chan) < 1) {
833 err = -ENODEV;
834 goto out;
835 }
836
837 /* test xor */
838 op = IOAT_OP_XOR;
839
840 dest_dma = dma_map_page(dev, dest, 0, PAGE_SIZE, DMA_FROM_DEVICE);
841 if (dma_mapping_error(dev, dest_dma)) {
842 err = -ENOMEM;
843 goto free_resources;
844 }
845
846 for (i = 0; i < IOAT_NUM_SRC_TEST; i++) {
847 dma_srcs[i] = dma_map_page(dev, xor_srcs[i], 0, PAGE_SIZE,
848 DMA_TO_DEVICE);
849 if (dma_mapping_error(dev, dma_srcs[i])) {
850 err = -ENOMEM;
851 goto dma_unmap;
852 }
853 }
854 tx = dma->device_prep_dma_xor(dma_chan, dest_dma, dma_srcs,
855 IOAT_NUM_SRC_TEST, PAGE_SIZE,
856 DMA_PREP_INTERRUPT);
857
858 if (!tx) {
859 dev_err(dev, "Self-test xor prep failed\n");
860 err = -ENODEV;
861 goto dma_unmap;
862 }
863
864 async_tx_ack(tx);
865 init_completion(&cmp);
866 tx->callback = ioat_dma_test_callback;
867 tx->callback_param = &cmp;
868 cookie = tx->tx_submit(tx);
869 if (cookie < 0) {
870 dev_err(dev, "Self-test xor setup failed\n");
871 err = -ENODEV;
872 goto dma_unmap;
873 }
874 dma->device_issue_pending(dma_chan);
875
876 tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
877
878 if (tmo == 0 ||
879 dma->device_tx_status(dma_chan, cookie, NULL) != DMA_COMPLETE) {
880 dev_err(dev, "Self-test xor timed out\n");
881 err = -ENODEV;
882 goto dma_unmap;
883 }
884
885 for (i = 0; i < IOAT_NUM_SRC_TEST; i++)
886 dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, DMA_TO_DEVICE);
887
888 dma_sync_single_for_cpu(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE);
889 for (i = 0; i < (PAGE_SIZE / sizeof(u32)); i++) {
890 u32 *ptr = page_address(dest);
891
892 if (ptr[i] != cmp_word) {
893 dev_err(dev, "Self-test xor failed compare\n");
894 err = -ENODEV;
895 goto free_resources;
896 }
897 }
898 dma_sync_single_for_device(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE);
899
900 dma_unmap_page(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE);
901
902 /* skip validate if the capability is not present */
903 if (!dma_has_cap(DMA_XOR_VAL, dma_chan->device->cap_mask))
904 goto free_resources;
905
906 op = IOAT_OP_XOR_VAL;
907
908 /* validate the sources with the destination page */
909 for (i = 0; i < IOAT_NUM_SRC_TEST; i++)
910 xor_val_srcs[i] = xor_srcs[i];
911 xor_val_srcs[i] = dest;
912
913 xor_val_result = 1;
914
915 for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) {
916 dma_srcs[i] = dma_map_page(dev, xor_val_srcs[i], 0, PAGE_SIZE,
917 DMA_TO_DEVICE);
918 if (dma_mapping_error(dev, dma_srcs[i])) {
919 err = -ENOMEM;
920 goto dma_unmap;
921 }
922 }
923 tx = dma->device_prep_dma_xor_val(dma_chan, dma_srcs,
924 IOAT_NUM_SRC_TEST + 1, PAGE_SIZE,
925 &xor_val_result, DMA_PREP_INTERRUPT);
926 if (!tx) {
927 dev_err(dev, "Self-test zero prep failed\n");
928 err = -ENODEV;
929 goto dma_unmap;
930 }
931
932 async_tx_ack(tx);
933 init_completion(&cmp);
934 tx->callback = ioat_dma_test_callback;
935 tx->callback_param = &cmp;
936 cookie = tx->tx_submit(tx);
937 if (cookie < 0) {
938 dev_err(dev, "Self-test zero setup failed\n");
939 err = -ENODEV;
940 goto dma_unmap;
941 }
942 dma->device_issue_pending(dma_chan);
943
944 tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
945
946 if (tmo == 0 ||
947 dma->device_tx_status(dma_chan, cookie, NULL) != DMA_COMPLETE) {
948 dev_err(dev, "Self-test validate timed out\n");
949 err = -ENODEV;
950 goto dma_unmap;
951 }
952
953 for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++)
954 dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, DMA_TO_DEVICE);
955
956 if (xor_val_result != 0) {
957 dev_err(dev, "Self-test validate failed compare\n");
958 err = -ENODEV;
959 goto free_resources;
960 }
961
962 memset(page_address(dest), 0, PAGE_SIZE);
963
964 /* test for non-zero parity sum */
965 op = IOAT_OP_XOR_VAL;
966
967 xor_val_result = 0;
968 for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) {
969 dma_srcs[i] = dma_map_page(dev, xor_val_srcs[i], 0, PAGE_SIZE,
970 DMA_TO_DEVICE);
971 if (dma_mapping_error(dev, dma_srcs[i])) {
972 err = -ENOMEM;
973 goto dma_unmap;
974 }
975 }
976 tx = dma->device_prep_dma_xor_val(dma_chan, dma_srcs,
977 IOAT_NUM_SRC_TEST + 1, PAGE_SIZE,
978 &xor_val_result, DMA_PREP_INTERRUPT);
979 if (!tx) {
980 dev_err(dev, "Self-test 2nd zero prep failed\n");
981 err = -ENODEV;
982 goto dma_unmap;
983 }
984
985 async_tx_ack(tx);
986 init_completion(&cmp);
987 tx->callback = ioat_dma_test_callback;
988 tx->callback_param = &cmp;
989 cookie = tx->tx_submit(tx);
990 if (cookie < 0) {
991 dev_err(dev, "Self-test 2nd zero setup failed\n");
992 err = -ENODEV;
993 goto dma_unmap;
994 }
995 dma->device_issue_pending(dma_chan);
996
997 tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000));
998
999 if (tmo == 0 ||
1000 dma->device_tx_status(dma_chan, cookie, NULL) != DMA_COMPLETE) {
1001 dev_err(dev, "Self-test 2nd validate timed out\n");
1002 err = -ENODEV;
1003 goto dma_unmap;
1004 }
1005
1006 if (xor_val_result != SUM_CHECK_P_RESULT) {
1007 dev_err(dev, "Self-test validate failed compare\n");
1008 err = -ENODEV;
1009 goto dma_unmap;
1010 }
1011
1012 for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++)
1013 dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, DMA_TO_DEVICE);
1014
1015 goto free_resources;
1016 dma_unmap:
1017 if (op == IOAT_OP_XOR) {
1018 while (--i >= 0)
1019 dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE,
1020 DMA_TO_DEVICE);
1021 dma_unmap_page(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE);
1022 } else if (op == IOAT_OP_XOR_VAL) {
1023 while (--i >= 0)
1024 dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE,
1025 DMA_TO_DEVICE);
1026 }
1027 free_resources:
1028 dma->device_free_chan_resources(dma_chan);
1029 out:
1030 src_idx = IOAT_NUM_SRC_TEST;
1031 while (src_idx--)
1032 __free_page(xor_srcs[src_idx]);
1033 __free_page(dest);
1034 return err;
1035 }
1036
ioat3_dma_self_test(struct ioatdma_device * ioat_dma)1037 static int ioat3_dma_self_test(struct ioatdma_device *ioat_dma)
1038 {
1039 int rc;
1040
1041 rc = ioat_dma_self_test(ioat_dma);
1042 if (rc)
1043 return rc;
1044
1045 rc = ioat_xor_val_self_test(ioat_dma);
1046
1047 return rc;
1048 }
1049
ioat_intr_quirk(struct ioatdma_device * ioat_dma)1050 static void ioat_intr_quirk(struct ioatdma_device *ioat_dma)
1051 {
1052 struct dma_device *dma;
1053 struct dma_chan *c;
1054 struct ioatdma_chan *ioat_chan;
1055 u32 errmask;
1056
1057 dma = &ioat_dma->dma_dev;
1058
1059 /*
1060 * if we have descriptor write back error status, we mask the
1061 * error interrupts
1062 */
1063 if (ioat_dma->cap & IOAT_CAP_DWBES) {
1064 list_for_each_entry(c, &dma->channels, device_node) {
1065 ioat_chan = to_ioat_chan(c);
1066 errmask = readl(ioat_chan->reg_base +
1067 IOAT_CHANERR_MASK_OFFSET);
1068 errmask |= IOAT_CHANERR_XOR_P_OR_CRC_ERR |
1069 IOAT_CHANERR_XOR_Q_ERR;
1070 writel(errmask, ioat_chan->reg_base +
1071 IOAT_CHANERR_MASK_OFFSET);
1072 }
1073 }
1074 }
1075
ioat3_dma_probe(struct ioatdma_device * ioat_dma,int dca)1076 static int ioat3_dma_probe(struct ioatdma_device *ioat_dma, int dca)
1077 {
1078 struct pci_dev *pdev = ioat_dma->pdev;
1079 int dca_en = system_has_dca_enabled(pdev);
1080 struct dma_device *dma;
1081 struct dma_chan *c;
1082 struct ioatdma_chan *ioat_chan;
1083 int err;
1084 u16 val16;
1085
1086 dma = &ioat_dma->dma_dev;
1087 dma->device_prep_dma_memcpy = ioat_dma_prep_memcpy_lock;
1088 dma->device_issue_pending = ioat_issue_pending;
1089 dma->device_alloc_chan_resources = ioat_alloc_chan_resources;
1090 dma->device_free_chan_resources = ioat_free_chan_resources;
1091
1092 dma_cap_set(DMA_INTERRUPT, dma->cap_mask);
1093 dma->device_prep_dma_interrupt = ioat_prep_interrupt_lock;
1094
1095 ioat_dma->cap = readl(ioat_dma->reg_base + IOAT_DMA_CAP_OFFSET);
1096
1097 if (is_xeon_cb32(pdev) || is_bwd_noraid(pdev))
1098 ioat_dma->cap &=
1099 ~(IOAT_CAP_XOR | IOAT_CAP_PQ | IOAT_CAP_RAID16SS);
1100
1101 /* dca is incompatible with raid operations */
1102 if (dca_en && (ioat_dma->cap & (IOAT_CAP_XOR|IOAT_CAP_PQ)))
1103 ioat_dma->cap &= ~(IOAT_CAP_XOR|IOAT_CAP_PQ);
1104
1105 if (ioat_dma->cap & IOAT_CAP_XOR) {
1106 dma->max_xor = 8;
1107
1108 dma_cap_set(DMA_XOR, dma->cap_mask);
1109 dma->device_prep_dma_xor = ioat_prep_xor;
1110
1111 dma_cap_set(DMA_XOR_VAL, dma->cap_mask);
1112 dma->device_prep_dma_xor_val = ioat_prep_xor_val;
1113 }
1114
1115 if (ioat_dma->cap & IOAT_CAP_PQ) {
1116
1117 dma->device_prep_dma_pq = ioat_prep_pq;
1118 dma->device_prep_dma_pq_val = ioat_prep_pq_val;
1119 dma_cap_set(DMA_PQ, dma->cap_mask);
1120 dma_cap_set(DMA_PQ_VAL, dma->cap_mask);
1121
1122 if (ioat_dma->cap & IOAT_CAP_RAID16SS)
1123 dma_set_maxpq(dma, 16, 0);
1124 else
1125 dma_set_maxpq(dma, 8, 0);
1126
1127 if (!(ioat_dma->cap & IOAT_CAP_XOR)) {
1128 dma->device_prep_dma_xor = ioat_prep_pqxor;
1129 dma->device_prep_dma_xor_val = ioat_prep_pqxor_val;
1130 dma_cap_set(DMA_XOR, dma->cap_mask);
1131 dma_cap_set(DMA_XOR_VAL, dma->cap_mask);
1132
1133 if (ioat_dma->cap & IOAT_CAP_RAID16SS)
1134 dma->max_xor = 16;
1135 else
1136 dma->max_xor = 8;
1137 }
1138 }
1139
1140 dma->device_tx_status = ioat_tx_status;
1141
1142 /* starting with CB3.3 super extended descriptors are supported */
1143 if (ioat_dma->cap & IOAT_CAP_RAID16SS) {
1144 char pool_name[14];
1145 int i;
1146
1147 for (i = 0; i < MAX_SED_POOLS; i++) {
1148 snprintf(pool_name, 14, "ioat_hw%d_sed", i);
1149
1150 /* allocate SED DMA pool */
1151 ioat_dma->sed_hw_pool[i] = dmam_pool_create(pool_name,
1152 &pdev->dev,
1153 SED_SIZE * (i + 1), 64, 0);
1154 if (!ioat_dma->sed_hw_pool[i])
1155 return -ENOMEM;
1156
1157 }
1158 }
1159
1160 if (!(ioat_dma->cap & (IOAT_CAP_XOR | IOAT_CAP_PQ)))
1161 dma_cap_set(DMA_PRIVATE, dma->cap_mask);
1162
1163 err = ioat_probe(ioat_dma);
1164 if (err)
1165 return err;
1166
1167 list_for_each_entry(c, &dma->channels, device_node) {
1168 ioat_chan = to_ioat_chan(c);
1169 writel(IOAT_DMA_DCA_ANY_CPU,
1170 ioat_chan->reg_base + IOAT_DCACTRL_OFFSET);
1171 }
1172
1173 err = dma_async_device_register(&ioat_dma->dma_dev);
1174 if (err)
1175 goto err_disable_interrupts;
1176
1177 ioat_kobject_add(ioat_dma, &ioat_ktype);
1178
1179 if (dca)
1180 ioat_dma->dca = ioat_dca_init(pdev, ioat_dma->reg_base);
1181
1182 /* disable relaxed ordering */
1183 err = pcie_capability_read_word(pdev, PCI_EXP_DEVCTL, &val16);
1184 if (err) {
1185 err = pcibios_err_to_errno(err);
1186 goto err_disable_interrupts;
1187 }
1188
1189 /* clear relaxed ordering enable */
1190 val16 &= ~PCI_EXP_DEVCTL_RELAX_EN;
1191 err = pcie_capability_write_word(pdev, PCI_EXP_DEVCTL, val16);
1192 if (err) {
1193 err = pcibios_err_to_errno(err);
1194 goto err_disable_interrupts;
1195 }
1196
1197 if (ioat_dma->cap & IOAT_CAP_DPS)
1198 writeb(ioat_pending_level + 1,
1199 ioat_dma->reg_base + IOAT_PREFETCH_LIMIT_OFFSET);
1200
1201 return 0;
1202
1203 err_disable_interrupts:
1204 ioat_disable_interrupts(ioat_dma);
1205 dma_pool_destroy(ioat_dma->completion_pool);
1206 return err;
1207 }
1208
ioat_shutdown(struct pci_dev * pdev)1209 static void ioat_shutdown(struct pci_dev *pdev)
1210 {
1211 struct ioatdma_device *ioat_dma = pci_get_drvdata(pdev);
1212 struct ioatdma_chan *ioat_chan;
1213 int i;
1214
1215 if (!ioat_dma)
1216 return;
1217
1218 for (i = 0; i < IOAT_MAX_CHANS; i++) {
1219 ioat_chan = ioat_dma->idx[i];
1220 if (!ioat_chan)
1221 continue;
1222
1223 spin_lock_bh(&ioat_chan->prep_lock);
1224 set_bit(IOAT_CHAN_DOWN, &ioat_chan->state);
1225 spin_unlock_bh(&ioat_chan->prep_lock);
1226 /*
1227 * Synchronization rule for del_timer_sync():
1228 * - The caller must not hold locks which would prevent
1229 * completion of the timer's handler.
1230 * So prep_lock cannot be held before calling it.
1231 */
1232 del_timer_sync(&ioat_chan->timer);
1233
1234 /* this should quiesce then reset */
1235 ioat_reset_hw(ioat_chan);
1236 }
1237
1238 ioat_disable_interrupts(ioat_dma);
1239 }
1240
ioat_resume(struct ioatdma_device * ioat_dma)1241 static void ioat_resume(struct ioatdma_device *ioat_dma)
1242 {
1243 struct ioatdma_chan *ioat_chan;
1244 u32 chanerr;
1245 int i;
1246
1247 for (i = 0; i < IOAT_MAX_CHANS; i++) {
1248 ioat_chan = ioat_dma->idx[i];
1249 if (!ioat_chan)
1250 continue;
1251
1252 spin_lock_bh(&ioat_chan->prep_lock);
1253 clear_bit(IOAT_CHAN_DOWN, &ioat_chan->state);
1254 spin_unlock_bh(&ioat_chan->prep_lock);
1255
1256 chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
1257 writel(chanerr, ioat_chan->reg_base + IOAT_CHANERR_OFFSET);
1258
1259 /* no need to reset as shutdown already did that */
1260 }
1261 }
1262
1263 #define DRV_NAME "ioatdma"
1264
ioat_pcie_error_detected(struct pci_dev * pdev,pci_channel_state_t error)1265 static pci_ers_result_t ioat_pcie_error_detected(struct pci_dev *pdev,
1266 pci_channel_state_t error)
1267 {
1268 dev_dbg(&pdev->dev, "%s: PCIe AER error %d\n", DRV_NAME, error);
1269
1270 /* quiesce and block I/O */
1271 ioat_shutdown(pdev);
1272
1273 return PCI_ERS_RESULT_NEED_RESET;
1274 }
1275
ioat_pcie_error_slot_reset(struct pci_dev * pdev)1276 static pci_ers_result_t ioat_pcie_error_slot_reset(struct pci_dev *pdev)
1277 {
1278 pci_ers_result_t result = PCI_ERS_RESULT_RECOVERED;
1279
1280 dev_dbg(&pdev->dev, "%s post reset handling\n", DRV_NAME);
1281
1282 if (pci_enable_device_mem(pdev) < 0) {
1283 dev_err(&pdev->dev,
1284 "Failed to enable PCIe device after reset.\n");
1285 result = PCI_ERS_RESULT_DISCONNECT;
1286 } else {
1287 pci_set_master(pdev);
1288 pci_restore_state(pdev);
1289 pci_save_state(pdev);
1290 pci_wake_from_d3(pdev, false);
1291 }
1292
1293 return result;
1294 }
1295
ioat_pcie_error_resume(struct pci_dev * pdev)1296 static void ioat_pcie_error_resume(struct pci_dev *pdev)
1297 {
1298 struct ioatdma_device *ioat_dma = pci_get_drvdata(pdev);
1299
1300 dev_dbg(&pdev->dev, "%s: AER handling resuming\n", DRV_NAME);
1301
1302 /* initialize and bring everything back */
1303 ioat_resume(ioat_dma);
1304 }
1305
1306 static const struct pci_error_handlers ioat_err_handler = {
1307 .error_detected = ioat_pcie_error_detected,
1308 .slot_reset = ioat_pcie_error_slot_reset,
1309 .resume = ioat_pcie_error_resume,
1310 };
1311
1312 static struct pci_driver ioat_pci_driver = {
1313 .name = DRV_NAME,
1314 .id_table = ioat_pci_tbl,
1315 .probe = ioat_pci_probe,
1316 .remove = ioat_remove,
1317 .shutdown = ioat_shutdown,
1318 .err_handler = &ioat_err_handler,
1319 };
1320
release_ioatdma(struct dma_device * device)1321 static void release_ioatdma(struct dma_device *device)
1322 {
1323 struct ioatdma_device *d = to_ioatdma_device(device);
1324 int i;
1325
1326 for (i = 0; i < IOAT_MAX_CHANS; i++)
1327 kfree(d->idx[i]);
1328
1329 dma_pool_destroy(d->completion_pool);
1330 kfree(d);
1331 }
1332
1333 static struct ioatdma_device *
alloc_ioatdma(struct pci_dev * pdev,void __iomem * iobase)1334 alloc_ioatdma(struct pci_dev *pdev, void __iomem *iobase)
1335 {
1336 struct ioatdma_device *d = kzalloc(sizeof(*d), GFP_KERNEL);
1337
1338 if (!d)
1339 return NULL;
1340 d->pdev = pdev;
1341 d->reg_base = iobase;
1342 d->dma_dev.device_release = release_ioatdma;
1343 return d;
1344 }
1345
ioat_pci_probe(struct pci_dev * pdev,const struct pci_device_id * id)1346 static int ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
1347 {
1348 void __iomem * const *iomap;
1349 struct device *dev = &pdev->dev;
1350 struct ioatdma_device *device;
1351 unsigned int i;
1352 u8 version;
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 version = readb(iomap[IOAT_MMIO_BAR] + IOAT_VER_OFFSET);
1367 if (version < IOAT_VER_3_0)
1368 return -ENODEV;
1369
1370 err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
1371 if (err)
1372 return err;
1373
1374 device = alloc_ioatdma(pdev, iomap[IOAT_MMIO_BAR]);
1375 if (!device)
1376 return -ENOMEM;
1377 pci_set_master(pdev);
1378 pci_set_drvdata(pdev, device);
1379
1380 device->version = version;
1381 if (device->version >= IOAT_VER_3_4)
1382 ioat_dca_enabled = 0;
1383
1384 if (is_skx_ioat(pdev))
1385 device->version = IOAT_VER_3_2;
1386
1387 err = ioat3_dma_probe(device, ioat_dca_enabled);
1388 if (err) {
1389 for (i = 0; i < IOAT_MAX_CHANS; i++)
1390 kfree(device->idx[i]);
1391 kfree(device);
1392 dev_err(dev, "Intel(R) I/OAT DMA Engine init failed\n");
1393 return -ENODEV;
1394 }
1395
1396 return 0;
1397 }
1398
ioat_remove(struct pci_dev * pdev)1399 static void ioat_remove(struct pci_dev *pdev)
1400 {
1401 struct ioatdma_device *device = pci_get_drvdata(pdev);
1402
1403 if (!device)
1404 return;
1405
1406 ioat_shutdown(pdev);
1407
1408 dev_err(&pdev->dev, "Removing dma and dca services\n");
1409 if (device->dca) {
1410 unregister_dca_provider(device->dca, &pdev->dev);
1411 free_dca_provider(device->dca);
1412 device->dca = NULL;
1413 }
1414
1415 ioat_dma_remove(device);
1416 }
1417
ioat_init_module(void)1418 static int __init ioat_init_module(void)
1419 {
1420 int err = -ENOMEM;
1421
1422 pr_info("%s: Intel(R) QuickData Technology Driver %s\n",
1423 DRV_NAME, IOAT_DMA_VERSION);
1424
1425 ioat_cache = kmem_cache_create("ioat", sizeof(struct ioat_ring_ent),
1426 0, SLAB_HWCACHE_ALIGN, NULL);
1427 if (!ioat_cache)
1428 return -ENOMEM;
1429
1430 ioat_sed_cache = KMEM_CACHE(ioat_sed_ent, 0);
1431 if (!ioat_sed_cache)
1432 goto err_ioat_cache;
1433
1434 err = pci_register_driver(&ioat_pci_driver);
1435 if (err)
1436 goto err_ioat3_cache;
1437
1438 return 0;
1439
1440 err_ioat3_cache:
1441 kmem_cache_destroy(ioat_sed_cache);
1442
1443 err_ioat_cache:
1444 kmem_cache_destroy(ioat_cache);
1445
1446 return err;
1447 }
1448 module_init(ioat_init_module);
1449
ioat_exit_module(void)1450 static void __exit ioat_exit_module(void)
1451 {
1452 pci_unregister_driver(&ioat_pci_driver);
1453 kmem_cache_destroy(ioat_sed_cache);
1454 kmem_cache_destroy(ioat_cache);
1455 }
1456 module_exit(ioat_exit_module);
1457