1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Test driver to test endpoint functionality
4 *
5 * Copyright (C) 2017 Texas Instruments
6 * Author: Kishon Vijay Abraham I <kishon@ti.com>
7 */
8
9 #include <linux/crc32.h>
10 #include <linux/delay.h>
11 #include <linux/dmaengine.h>
12 #include <linux/io.h>
13 #include <linux/module.h>
14 #include <linux/slab.h>
15 #include <linux/pci_ids.h>
16 #include <linux/random.h>
17
18 #include <linux/pci-epc.h>
19 #include <linux/pci-epf.h>
20 #include <linux/pci_regs.h>
21
22 #define IRQ_TYPE_INTX 0
23 #define IRQ_TYPE_MSI 1
24 #define IRQ_TYPE_MSIX 2
25
26 #define COMMAND_RAISE_INTX_IRQ BIT(0)
27 #define COMMAND_RAISE_MSI_IRQ BIT(1)
28 #define COMMAND_RAISE_MSIX_IRQ BIT(2)
29 #define COMMAND_READ BIT(3)
30 #define COMMAND_WRITE BIT(4)
31 #define COMMAND_COPY BIT(5)
32
33 #define STATUS_READ_SUCCESS BIT(0)
34 #define STATUS_READ_FAIL BIT(1)
35 #define STATUS_WRITE_SUCCESS BIT(2)
36 #define STATUS_WRITE_FAIL BIT(3)
37 #define STATUS_COPY_SUCCESS BIT(4)
38 #define STATUS_COPY_FAIL BIT(5)
39 #define STATUS_IRQ_RAISED BIT(6)
40 #define STATUS_SRC_ADDR_INVALID BIT(7)
41 #define STATUS_DST_ADDR_INVALID BIT(8)
42
43 #define FLAG_USE_DMA BIT(0)
44
45 #define TIMER_RESOLUTION 1
46
47 static struct workqueue_struct *kpcitest_workqueue;
48
49 struct pci_epf_test {
50 void *reg[PCI_STD_NUM_BARS];
51 struct pci_epf *epf;
52 enum pci_barno test_reg_bar;
53 size_t msix_table_offset;
54 struct delayed_work cmd_handler;
55 struct dma_chan *dma_chan_tx;
56 struct dma_chan *dma_chan_rx;
57 struct dma_chan *transfer_chan;
58 dma_cookie_t transfer_cookie;
59 enum dma_status transfer_status;
60 struct completion transfer_complete;
61 bool dma_supported;
62 bool dma_private;
63 const struct pci_epc_features *epc_features;
64 };
65
66 struct pci_epf_test_reg {
67 u32 magic;
68 u32 command;
69 u32 status;
70 u64 src_addr;
71 u64 dst_addr;
72 u32 size;
73 u32 checksum;
74 u32 irq_type;
75 u32 irq_number;
76 u32 flags;
77 } __packed;
78
79 static struct pci_epf_header test_header = {
80 .vendorid = PCI_ANY_ID,
81 .deviceid = PCI_ANY_ID,
82 .baseclass_code = PCI_CLASS_OTHERS,
83 .interrupt_pin = PCI_INTERRUPT_INTA,
84 };
85
86 static size_t bar_size[] = { 512, 512, 1024, 16384, 131072, 1048576 };
87
pci_epf_test_dma_callback(void * param)88 static void pci_epf_test_dma_callback(void *param)
89 {
90 struct pci_epf_test *epf_test = param;
91 struct dma_tx_state state;
92
93 epf_test->transfer_status =
94 dmaengine_tx_status(epf_test->transfer_chan,
95 epf_test->transfer_cookie, &state);
96 if (epf_test->transfer_status == DMA_COMPLETE ||
97 epf_test->transfer_status == DMA_ERROR)
98 complete(&epf_test->transfer_complete);
99 }
100
101 /**
102 * pci_epf_test_data_transfer() - Function that uses dmaengine API to transfer
103 * data between PCIe EP and remote PCIe RC
104 * @epf_test: the EPF test device that performs the data transfer operation
105 * @dma_dst: The destination address of the data transfer. It can be a physical
106 * address given by pci_epc_mem_alloc_addr or DMA mapping APIs.
107 * @dma_src: The source address of the data transfer. It can be a physical
108 * address given by pci_epc_mem_alloc_addr or DMA mapping APIs.
109 * @len: The size of the data transfer
110 * @dma_remote: remote RC physical address
111 * @dir: DMA transfer direction
112 *
113 * Function that uses dmaengine API to transfer data between PCIe EP and remote
114 * PCIe RC. The source and destination address can be a physical address given
115 * by pci_epc_mem_alloc_addr or the one obtained using DMA mapping APIs.
116 *
117 * The function returns '0' on success and negative value on failure.
118 */
pci_epf_test_data_transfer(struct pci_epf_test * epf_test,dma_addr_t dma_dst,dma_addr_t dma_src,size_t len,dma_addr_t dma_remote,enum dma_transfer_direction dir)119 static int pci_epf_test_data_transfer(struct pci_epf_test *epf_test,
120 dma_addr_t dma_dst, dma_addr_t dma_src,
121 size_t len, dma_addr_t dma_remote,
122 enum dma_transfer_direction dir)
123 {
124 struct dma_chan *chan = (dir == DMA_MEM_TO_DEV) ?
125 epf_test->dma_chan_tx : epf_test->dma_chan_rx;
126 dma_addr_t dma_local = (dir == DMA_MEM_TO_DEV) ? dma_src : dma_dst;
127 enum dma_ctrl_flags flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
128 struct pci_epf *epf = epf_test->epf;
129 struct dma_async_tx_descriptor *tx;
130 struct dma_slave_config sconf = {};
131 struct device *dev = &epf->dev;
132 int ret;
133
134 if (IS_ERR_OR_NULL(chan)) {
135 dev_err(dev, "Invalid DMA memcpy channel\n");
136 return -EINVAL;
137 }
138
139 if (epf_test->dma_private) {
140 sconf.direction = dir;
141 if (dir == DMA_MEM_TO_DEV)
142 sconf.dst_addr = dma_remote;
143 else
144 sconf.src_addr = dma_remote;
145
146 if (dmaengine_slave_config(chan, &sconf)) {
147 dev_err(dev, "DMA slave config fail\n");
148 return -EIO;
149 }
150 tx = dmaengine_prep_slave_single(chan, dma_local, len, dir,
151 flags);
152 } else {
153 tx = dmaengine_prep_dma_memcpy(chan, dma_dst, dma_src, len,
154 flags);
155 }
156
157 if (!tx) {
158 dev_err(dev, "Failed to prepare DMA memcpy\n");
159 return -EIO;
160 }
161
162 reinit_completion(&epf_test->transfer_complete);
163 epf_test->transfer_chan = chan;
164 tx->callback = pci_epf_test_dma_callback;
165 tx->callback_param = epf_test;
166 epf_test->transfer_cookie = dmaengine_submit(tx);
167
168 ret = dma_submit_error(epf_test->transfer_cookie);
169 if (ret) {
170 dev_err(dev, "Failed to do DMA tx_submit %d\n", ret);
171 goto terminate;
172 }
173
174 dma_async_issue_pending(chan);
175 ret = wait_for_completion_interruptible(&epf_test->transfer_complete);
176 if (ret < 0) {
177 dev_err(dev, "DMA wait_for_completion interrupted\n");
178 goto terminate;
179 }
180
181 if (epf_test->transfer_status == DMA_ERROR) {
182 dev_err(dev, "DMA transfer failed\n");
183 ret = -EIO;
184 }
185
186 terminate:
187 dmaengine_terminate_sync(chan);
188
189 return ret;
190 }
191
192 struct epf_dma_filter {
193 struct device *dev;
194 u32 dma_mask;
195 };
196
epf_dma_filter_fn(struct dma_chan * chan,void * node)197 static bool epf_dma_filter_fn(struct dma_chan *chan, void *node)
198 {
199 struct epf_dma_filter *filter = node;
200 struct dma_slave_caps caps;
201
202 memset(&caps, 0, sizeof(caps));
203 dma_get_slave_caps(chan, &caps);
204
205 return chan->device->dev == filter->dev
206 && (filter->dma_mask & caps.directions);
207 }
208
209 /**
210 * pci_epf_test_init_dma_chan() - Function to initialize EPF test DMA channel
211 * @epf_test: the EPF test device that performs data transfer operation
212 *
213 * Function to initialize EPF test DMA channel.
214 */
pci_epf_test_init_dma_chan(struct pci_epf_test * epf_test)215 static int pci_epf_test_init_dma_chan(struct pci_epf_test *epf_test)
216 {
217 struct pci_epf *epf = epf_test->epf;
218 struct device *dev = &epf->dev;
219 struct epf_dma_filter filter;
220 struct dma_chan *dma_chan;
221 dma_cap_mask_t mask;
222 int ret;
223
224 filter.dev = epf->epc->dev.parent;
225 filter.dma_mask = BIT(DMA_DEV_TO_MEM);
226
227 dma_cap_zero(mask);
228 dma_cap_set(DMA_SLAVE, mask);
229 dma_chan = dma_request_channel(mask, epf_dma_filter_fn, &filter);
230 if (!dma_chan) {
231 dev_info(dev, "Failed to get private DMA rx channel. Falling back to generic one\n");
232 goto fail_back_tx;
233 }
234
235 epf_test->dma_chan_rx = dma_chan;
236
237 filter.dma_mask = BIT(DMA_MEM_TO_DEV);
238 dma_chan = dma_request_channel(mask, epf_dma_filter_fn, &filter);
239
240 if (!dma_chan) {
241 dev_info(dev, "Failed to get private DMA tx channel. Falling back to generic one\n");
242 goto fail_back_rx;
243 }
244
245 epf_test->dma_chan_tx = dma_chan;
246 epf_test->dma_private = true;
247
248 init_completion(&epf_test->transfer_complete);
249
250 return 0;
251
252 fail_back_rx:
253 dma_release_channel(epf_test->dma_chan_rx);
254 epf_test->dma_chan_tx = NULL;
255
256 fail_back_tx:
257 dma_cap_zero(mask);
258 dma_cap_set(DMA_MEMCPY, mask);
259
260 dma_chan = dma_request_chan_by_mask(&mask);
261 if (IS_ERR(dma_chan)) {
262 ret = PTR_ERR(dma_chan);
263 if (ret != -EPROBE_DEFER)
264 dev_err(dev, "Failed to get DMA channel\n");
265 return ret;
266 }
267 init_completion(&epf_test->transfer_complete);
268
269 epf_test->dma_chan_tx = epf_test->dma_chan_rx = dma_chan;
270
271 return 0;
272 }
273
274 /**
275 * pci_epf_test_clean_dma_chan() - Function to cleanup EPF test DMA channel
276 * @epf_test: the EPF test device that performs data transfer operation
277 *
278 * Helper to cleanup EPF test DMA channel.
279 */
pci_epf_test_clean_dma_chan(struct pci_epf_test * epf_test)280 static void pci_epf_test_clean_dma_chan(struct pci_epf_test *epf_test)
281 {
282 if (!epf_test->dma_supported)
283 return;
284
285 dma_release_channel(epf_test->dma_chan_tx);
286 if (epf_test->dma_chan_tx == epf_test->dma_chan_rx) {
287 epf_test->dma_chan_tx = NULL;
288 epf_test->dma_chan_rx = NULL;
289 return;
290 }
291
292 dma_release_channel(epf_test->dma_chan_rx);
293 epf_test->dma_chan_rx = NULL;
294
295 return;
296 }
297
pci_epf_test_print_rate(struct pci_epf_test * epf_test,const char * op,u64 size,struct timespec64 * start,struct timespec64 * end,bool dma)298 static void pci_epf_test_print_rate(struct pci_epf_test *epf_test,
299 const char *op, u64 size,
300 struct timespec64 *start,
301 struct timespec64 *end, bool dma)
302 {
303 struct timespec64 ts = timespec64_sub(*end, *start);
304 u64 rate = 0, ns;
305
306 /* calculate the rate */
307 ns = timespec64_to_ns(&ts);
308 if (ns)
309 rate = div64_u64(size * NSEC_PER_SEC, ns * 1000);
310
311 dev_info(&epf_test->epf->dev,
312 "%s => Size: %llu B, DMA: %s, Time: %llu.%09u s, Rate: %llu KB/s\n",
313 op, size, dma ? "YES" : "NO",
314 (u64)ts.tv_sec, (u32)ts.tv_nsec, rate);
315 }
316
pci_epf_test_copy(struct pci_epf_test * epf_test,struct pci_epf_test_reg * reg)317 static void pci_epf_test_copy(struct pci_epf_test *epf_test,
318 struct pci_epf_test_reg *reg)
319 {
320 int ret;
321 void __iomem *src_addr;
322 void __iomem *dst_addr;
323 phys_addr_t src_phys_addr;
324 phys_addr_t dst_phys_addr;
325 struct timespec64 start, end;
326 struct pci_epf *epf = epf_test->epf;
327 struct device *dev = &epf->dev;
328 struct pci_epc *epc = epf->epc;
329
330 src_addr = pci_epc_mem_alloc_addr(epc, &src_phys_addr, reg->size);
331 if (!src_addr) {
332 dev_err(dev, "Failed to allocate source address\n");
333 reg->status = STATUS_SRC_ADDR_INVALID;
334 ret = -ENOMEM;
335 goto err;
336 }
337
338 ret = pci_epc_map_addr(epc, epf->func_no, epf->vfunc_no, src_phys_addr,
339 reg->src_addr, reg->size);
340 if (ret) {
341 dev_err(dev, "Failed to map source address\n");
342 reg->status = STATUS_SRC_ADDR_INVALID;
343 goto err_src_addr;
344 }
345
346 dst_addr = pci_epc_mem_alloc_addr(epc, &dst_phys_addr, reg->size);
347 if (!dst_addr) {
348 dev_err(dev, "Failed to allocate destination address\n");
349 reg->status = STATUS_DST_ADDR_INVALID;
350 ret = -ENOMEM;
351 goto err_src_map_addr;
352 }
353
354 ret = pci_epc_map_addr(epc, epf->func_no, epf->vfunc_no, dst_phys_addr,
355 reg->dst_addr, reg->size);
356 if (ret) {
357 dev_err(dev, "Failed to map destination address\n");
358 reg->status = STATUS_DST_ADDR_INVALID;
359 goto err_dst_addr;
360 }
361
362 ktime_get_ts64(&start);
363 if (reg->flags & FLAG_USE_DMA) {
364 if (epf_test->dma_private) {
365 dev_err(dev, "Cannot transfer data using DMA\n");
366 ret = -EINVAL;
367 goto err_map_addr;
368 }
369
370 ret = pci_epf_test_data_transfer(epf_test, dst_phys_addr,
371 src_phys_addr, reg->size, 0,
372 DMA_MEM_TO_MEM);
373 if (ret)
374 dev_err(dev, "Data transfer failed\n");
375 } else {
376 void *buf;
377
378 buf = kzalloc(reg->size, GFP_KERNEL);
379 if (!buf) {
380 ret = -ENOMEM;
381 goto err_map_addr;
382 }
383
384 memcpy_fromio(buf, src_addr, reg->size);
385 memcpy_toio(dst_addr, buf, reg->size);
386 kfree(buf);
387 }
388 ktime_get_ts64(&end);
389 pci_epf_test_print_rate(epf_test, "COPY", reg->size, &start, &end,
390 reg->flags & FLAG_USE_DMA);
391
392 err_map_addr:
393 pci_epc_unmap_addr(epc, epf->func_no, epf->vfunc_no, dst_phys_addr);
394
395 err_dst_addr:
396 pci_epc_mem_free_addr(epc, dst_phys_addr, dst_addr, reg->size);
397
398 err_src_map_addr:
399 pci_epc_unmap_addr(epc, epf->func_no, epf->vfunc_no, src_phys_addr);
400
401 err_src_addr:
402 pci_epc_mem_free_addr(epc, src_phys_addr, src_addr, reg->size);
403
404 err:
405 if (!ret)
406 reg->status |= STATUS_COPY_SUCCESS;
407 else
408 reg->status |= STATUS_COPY_FAIL;
409 }
410
pci_epf_test_read(struct pci_epf_test * epf_test,struct pci_epf_test_reg * reg)411 static void pci_epf_test_read(struct pci_epf_test *epf_test,
412 struct pci_epf_test_reg *reg)
413 {
414 int ret;
415 void __iomem *src_addr;
416 void *buf;
417 u32 crc32;
418 phys_addr_t phys_addr;
419 phys_addr_t dst_phys_addr;
420 struct timespec64 start, end;
421 struct pci_epf *epf = epf_test->epf;
422 struct device *dev = &epf->dev;
423 struct pci_epc *epc = epf->epc;
424 struct device *dma_dev = epf->epc->dev.parent;
425
426 src_addr = pci_epc_mem_alloc_addr(epc, &phys_addr, reg->size);
427 if (!src_addr) {
428 dev_err(dev, "Failed to allocate address\n");
429 reg->status = STATUS_SRC_ADDR_INVALID;
430 ret = -ENOMEM;
431 goto err;
432 }
433
434 ret = pci_epc_map_addr(epc, epf->func_no, epf->vfunc_no, phys_addr,
435 reg->src_addr, reg->size);
436 if (ret) {
437 dev_err(dev, "Failed to map address\n");
438 reg->status = STATUS_SRC_ADDR_INVALID;
439 goto err_addr;
440 }
441
442 buf = kzalloc(reg->size, GFP_KERNEL);
443 if (!buf) {
444 ret = -ENOMEM;
445 goto err_map_addr;
446 }
447
448 if (reg->flags & FLAG_USE_DMA) {
449 dst_phys_addr = dma_map_single(dma_dev, buf, reg->size,
450 DMA_FROM_DEVICE);
451 if (dma_mapping_error(dma_dev, dst_phys_addr)) {
452 dev_err(dev, "Failed to map destination buffer addr\n");
453 ret = -ENOMEM;
454 goto err_dma_map;
455 }
456
457 ktime_get_ts64(&start);
458 ret = pci_epf_test_data_transfer(epf_test, dst_phys_addr,
459 phys_addr, reg->size,
460 reg->src_addr, DMA_DEV_TO_MEM);
461 if (ret)
462 dev_err(dev, "Data transfer failed\n");
463 ktime_get_ts64(&end);
464
465 dma_unmap_single(dma_dev, dst_phys_addr, reg->size,
466 DMA_FROM_DEVICE);
467 } else {
468 ktime_get_ts64(&start);
469 memcpy_fromio(buf, src_addr, reg->size);
470 ktime_get_ts64(&end);
471 }
472
473 pci_epf_test_print_rate(epf_test, "READ", reg->size, &start, &end,
474 reg->flags & FLAG_USE_DMA);
475
476 crc32 = crc32_le(~0, buf, reg->size);
477 if (crc32 != reg->checksum)
478 ret = -EIO;
479
480 err_dma_map:
481 kfree(buf);
482
483 err_map_addr:
484 pci_epc_unmap_addr(epc, epf->func_no, epf->vfunc_no, phys_addr);
485
486 err_addr:
487 pci_epc_mem_free_addr(epc, phys_addr, src_addr, reg->size);
488
489 err:
490 if (!ret)
491 reg->status |= STATUS_READ_SUCCESS;
492 else
493 reg->status |= STATUS_READ_FAIL;
494 }
495
pci_epf_test_write(struct pci_epf_test * epf_test,struct pci_epf_test_reg * reg)496 static void pci_epf_test_write(struct pci_epf_test *epf_test,
497 struct pci_epf_test_reg *reg)
498 {
499 int ret;
500 void __iomem *dst_addr;
501 void *buf;
502 phys_addr_t phys_addr;
503 phys_addr_t src_phys_addr;
504 struct timespec64 start, end;
505 struct pci_epf *epf = epf_test->epf;
506 struct device *dev = &epf->dev;
507 struct pci_epc *epc = epf->epc;
508 struct device *dma_dev = epf->epc->dev.parent;
509
510 dst_addr = pci_epc_mem_alloc_addr(epc, &phys_addr, reg->size);
511 if (!dst_addr) {
512 dev_err(dev, "Failed to allocate address\n");
513 reg->status = STATUS_DST_ADDR_INVALID;
514 ret = -ENOMEM;
515 goto err;
516 }
517
518 ret = pci_epc_map_addr(epc, epf->func_no, epf->vfunc_no, phys_addr,
519 reg->dst_addr, reg->size);
520 if (ret) {
521 dev_err(dev, "Failed to map address\n");
522 reg->status = STATUS_DST_ADDR_INVALID;
523 goto err_addr;
524 }
525
526 buf = kzalloc(reg->size, GFP_KERNEL);
527 if (!buf) {
528 ret = -ENOMEM;
529 goto err_map_addr;
530 }
531
532 get_random_bytes(buf, reg->size);
533 reg->checksum = crc32_le(~0, buf, reg->size);
534
535 if (reg->flags & FLAG_USE_DMA) {
536 src_phys_addr = dma_map_single(dma_dev, buf, reg->size,
537 DMA_TO_DEVICE);
538 if (dma_mapping_error(dma_dev, src_phys_addr)) {
539 dev_err(dev, "Failed to map source buffer addr\n");
540 ret = -ENOMEM;
541 goto err_dma_map;
542 }
543
544 ktime_get_ts64(&start);
545
546 ret = pci_epf_test_data_transfer(epf_test, phys_addr,
547 src_phys_addr, reg->size,
548 reg->dst_addr,
549 DMA_MEM_TO_DEV);
550 if (ret)
551 dev_err(dev, "Data transfer failed\n");
552 ktime_get_ts64(&end);
553
554 dma_unmap_single(dma_dev, src_phys_addr, reg->size,
555 DMA_TO_DEVICE);
556 } else {
557 ktime_get_ts64(&start);
558 memcpy_toio(dst_addr, buf, reg->size);
559 ktime_get_ts64(&end);
560 }
561
562 pci_epf_test_print_rate(epf_test, "WRITE", reg->size, &start, &end,
563 reg->flags & FLAG_USE_DMA);
564
565 /*
566 * wait 1ms inorder for the write to complete. Without this delay L3
567 * error in observed in the host system.
568 */
569 usleep_range(1000, 2000);
570
571 err_dma_map:
572 kfree(buf);
573
574 err_map_addr:
575 pci_epc_unmap_addr(epc, epf->func_no, epf->vfunc_no, phys_addr);
576
577 err_addr:
578 pci_epc_mem_free_addr(epc, phys_addr, dst_addr, reg->size);
579
580 err:
581 if (!ret)
582 reg->status |= STATUS_WRITE_SUCCESS;
583 else
584 reg->status |= STATUS_WRITE_FAIL;
585 }
586
pci_epf_test_raise_irq(struct pci_epf_test * epf_test,struct pci_epf_test_reg * reg)587 static void pci_epf_test_raise_irq(struct pci_epf_test *epf_test,
588 struct pci_epf_test_reg *reg)
589 {
590 struct pci_epf *epf = epf_test->epf;
591 struct device *dev = &epf->dev;
592 struct pci_epc *epc = epf->epc;
593 u32 status = reg->status | STATUS_IRQ_RAISED;
594 int count;
595
596 /*
597 * Set the status before raising the IRQ to ensure that the host sees
598 * the updated value when it gets the IRQ.
599 */
600 WRITE_ONCE(reg->status, status);
601
602 switch (reg->irq_type) {
603 case IRQ_TYPE_INTX:
604 pci_epc_raise_irq(epc, epf->func_no, epf->vfunc_no,
605 PCI_IRQ_INTX, 0);
606 break;
607 case IRQ_TYPE_MSI:
608 count = pci_epc_get_msi(epc, epf->func_no, epf->vfunc_no);
609 if (reg->irq_number > count || count <= 0) {
610 dev_err(dev, "Invalid MSI IRQ number %d / %d\n",
611 reg->irq_number, count);
612 return;
613 }
614 pci_epc_raise_irq(epc, epf->func_no, epf->vfunc_no,
615 PCI_IRQ_MSI, reg->irq_number);
616 break;
617 case IRQ_TYPE_MSIX:
618 count = pci_epc_get_msix(epc, epf->func_no, epf->vfunc_no);
619 if (reg->irq_number > count || count <= 0) {
620 dev_err(dev, "Invalid MSIX IRQ number %d / %d\n",
621 reg->irq_number, count);
622 return;
623 }
624 pci_epc_raise_irq(epc, epf->func_no, epf->vfunc_no,
625 PCI_IRQ_MSIX, reg->irq_number);
626 break;
627 default:
628 dev_err(dev, "Failed to raise IRQ, unknown type\n");
629 break;
630 }
631 }
632
pci_epf_test_cmd_handler(struct work_struct * work)633 static void pci_epf_test_cmd_handler(struct work_struct *work)
634 {
635 u32 command;
636 struct pci_epf_test *epf_test = container_of(work, struct pci_epf_test,
637 cmd_handler.work);
638 struct pci_epf *epf = epf_test->epf;
639 struct device *dev = &epf->dev;
640 enum pci_barno test_reg_bar = epf_test->test_reg_bar;
641 struct pci_epf_test_reg *reg = epf_test->reg[test_reg_bar];
642
643 command = READ_ONCE(reg->command);
644 if (!command)
645 goto reset_handler;
646
647 WRITE_ONCE(reg->command, 0);
648 WRITE_ONCE(reg->status, 0);
649
650 if ((READ_ONCE(reg->flags) & FLAG_USE_DMA) &&
651 !epf_test->dma_supported) {
652 dev_err(dev, "Cannot transfer data using DMA\n");
653 goto reset_handler;
654 }
655
656 if (reg->irq_type > IRQ_TYPE_MSIX) {
657 dev_err(dev, "Failed to detect IRQ type\n");
658 goto reset_handler;
659 }
660
661 switch (command) {
662 case COMMAND_RAISE_INTX_IRQ:
663 case COMMAND_RAISE_MSI_IRQ:
664 case COMMAND_RAISE_MSIX_IRQ:
665 pci_epf_test_raise_irq(epf_test, reg);
666 break;
667 case COMMAND_WRITE:
668 pci_epf_test_write(epf_test, reg);
669 pci_epf_test_raise_irq(epf_test, reg);
670 break;
671 case COMMAND_READ:
672 pci_epf_test_read(epf_test, reg);
673 pci_epf_test_raise_irq(epf_test, reg);
674 break;
675 case COMMAND_COPY:
676 pci_epf_test_copy(epf_test, reg);
677 pci_epf_test_raise_irq(epf_test, reg);
678 break;
679 default:
680 dev_err(dev, "Invalid command 0x%x\n", command);
681 break;
682 }
683
684 reset_handler:
685 queue_delayed_work(kpcitest_workqueue, &epf_test->cmd_handler,
686 msecs_to_jiffies(1));
687 }
688
pci_epf_test_set_bar(struct pci_epf * epf)689 static int pci_epf_test_set_bar(struct pci_epf *epf)
690 {
691 int bar, ret;
692 struct pci_epc *epc = epf->epc;
693 struct device *dev = &epf->dev;
694 struct pci_epf_test *epf_test = epf_get_drvdata(epf);
695 enum pci_barno test_reg_bar = epf_test->test_reg_bar;
696
697 for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
698 if (!epf_test->reg[bar])
699 continue;
700
701 ret = pci_epc_set_bar(epc, epf->func_no, epf->vfunc_no,
702 &epf->bar[bar]);
703 if (ret) {
704 pci_epf_free_space(epf, epf_test->reg[bar], bar,
705 PRIMARY_INTERFACE);
706 dev_err(dev, "Failed to set BAR%d\n", bar);
707 if (bar == test_reg_bar)
708 return ret;
709 }
710 }
711
712 return 0;
713 }
714
pci_epf_test_clear_bar(struct pci_epf * epf)715 static void pci_epf_test_clear_bar(struct pci_epf *epf)
716 {
717 struct pci_epf_test *epf_test = epf_get_drvdata(epf);
718 struct pci_epc *epc = epf->epc;
719 int bar;
720
721 for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
722 if (!epf_test->reg[bar])
723 continue;
724
725 pci_epc_clear_bar(epc, epf->func_no, epf->vfunc_no,
726 &epf->bar[bar]);
727 }
728 }
729
pci_epf_test_epc_init(struct pci_epf * epf)730 static int pci_epf_test_epc_init(struct pci_epf *epf)
731 {
732 struct pci_epf_test *epf_test = epf_get_drvdata(epf);
733 struct pci_epf_header *header = epf->header;
734 const struct pci_epc_features *epc_features = epf_test->epc_features;
735 struct pci_epc *epc = epf->epc;
736 struct device *dev = &epf->dev;
737 bool linkup_notifier = false;
738 int ret;
739
740 epf_test->dma_supported = true;
741
742 ret = pci_epf_test_init_dma_chan(epf_test);
743 if (ret)
744 epf_test->dma_supported = false;
745
746 if (epf->vfunc_no <= 1) {
747 ret = pci_epc_write_header(epc, epf->func_no, epf->vfunc_no, header);
748 if (ret) {
749 dev_err(dev, "Configuration header write failed\n");
750 return ret;
751 }
752 }
753
754 ret = pci_epf_test_set_bar(epf);
755 if (ret)
756 return ret;
757
758 if (epc_features->msi_capable) {
759 ret = pci_epc_set_msi(epc, epf->func_no, epf->vfunc_no,
760 epf->msi_interrupts);
761 if (ret) {
762 dev_err(dev, "MSI configuration failed\n");
763 return ret;
764 }
765 }
766
767 if (epc_features->msix_capable) {
768 ret = pci_epc_set_msix(epc, epf->func_no, epf->vfunc_no,
769 epf->msix_interrupts,
770 epf_test->test_reg_bar,
771 epf_test->msix_table_offset);
772 if (ret) {
773 dev_err(dev, "MSI-X configuration failed\n");
774 return ret;
775 }
776 }
777
778 linkup_notifier = epc_features->linkup_notifier;
779 if (!linkup_notifier)
780 queue_work(kpcitest_workqueue, &epf_test->cmd_handler.work);
781
782 return 0;
783 }
784
pci_epf_test_epc_deinit(struct pci_epf * epf)785 static void pci_epf_test_epc_deinit(struct pci_epf *epf)
786 {
787 struct pci_epf_test *epf_test = epf_get_drvdata(epf);
788
789 cancel_delayed_work(&epf_test->cmd_handler);
790 pci_epf_test_clean_dma_chan(epf_test);
791 pci_epf_test_clear_bar(epf);
792 }
793
pci_epf_test_link_up(struct pci_epf * epf)794 static int pci_epf_test_link_up(struct pci_epf *epf)
795 {
796 struct pci_epf_test *epf_test = epf_get_drvdata(epf);
797
798 queue_delayed_work(kpcitest_workqueue, &epf_test->cmd_handler,
799 msecs_to_jiffies(1));
800
801 return 0;
802 }
803
pci_epf_test_link_down(struct pci_epf * epf)804 static int pci_epf_test_link_down(struct pci_epf *epf)
805 {
806 struct pci_epf_test *epf_test = epf_get_drvdata(epf);
807
808 cancel_delayed_work_sync(&epf_test->cmd_handler);
809
810 return 0;
811 }
812
813 static const struct pci_epc_event_ops pci_epf_test_event_ops = {
814 .epc_init = pci_epf_test_epc_init,
815 .epc_deinit = pci_epf_test_epc_deinit,
816 .link_up = pci_epf_test_link_up,
817 .link_down = pci_epf_test_link_down,
818 };
819
pci_epf_test_alloc_space(struct pci_epf * epf)820 static int pci_epf_test_alloc_space(struct pci_epf *epf)
821 {
822 struct pci_epf_test *epf_test = epf_get_drvdata(epf);
823 struct device *dev = &epf->dev;
824 size_t msix_table_size = 0;
825 size_t test_reg_bar_size;
826 size_t pba_size = 0;
827 void *base;
828 enum pci_barno test_reg_bar = epf_test->test_reg_bar;
829 enum pci_barno bar;
830 const struct pci_epc_features *epc_features = epf_test->epc_features;
831 size_t test_reg_size;
832
833 test_reg_bar_size = ALIGN(sizeof(struct pci_epf_test_reg), 128);
834
835 if (epc_features->msix_capable) {
836 msix_table_size = PCI_MSIX_ENTRY_SIZE * epf->msix_interrupts;
837 epf_test->msix_table_offset = test_reg_bar_size;
838 /* Align to QWORD or 8 Bytes */
839 pba_size = ALIGN(DIV_ROUND_UP(epf->msix_interrupts, 8), 8);
840 }
841 test_reg_size = test_reg_bar_size + msix_table_size + pba_size;
842
843 base = pci_epf_alloc_space(epf, test_reg_size, test_reg_bar,
844 epc_features, PRIMARY_INTERFACE);
845 if (!base) {
846 dev_err(dev, "Failed to allocated register space\n");
847 return -ENOMEM;
848 }
849 epf_test->reg[test_reg_bar] = base;
850
851 for (bar = BAR_0; bar < PCI_STD_NUM_BARS; bar++) {
852 bar = pci_epc_get_next_free_bar(epc_features, bar);
853 if (bar == NO_BAR)
854 break;
855
856 if (bar == test_reg_bar)
857 continue;
858
859 base = pci_epf_alloc_space(epf, bar_size[bar], bar,
860 epc_features, PRIMARY_INTERFACE);
861 if (!base)
862 dev_err(dev, "Failed to allocate space for BAR%d\n",
863 bar);
864 epf_test->reg[bar] = base;
865 }
866
867 return 0;
868 }
869
pci_epf_test_free_space(struct pci_epf * epf)870 static void pci_epf_test_free_space(struct pci_epf *epf)
871 {
872 struct pci_epf_test *epf_test = epf_get_drvdata(epf);
873 int bar;
874
875 for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
876 if (!epf_test->reg[bar])
877 continue;
878
879 pci_epf_free_space(epf, epf_test->reg[bar], bar,
880 PRIMARY_INTERFACE);
881 }
882 }
883
pci_epf_test_bind(struct pci_epf * epf)884 static int pci_epf_test_bind(struct pci_epf *epf)
885 {
886 int ret;
887 struct pci_epf_test *epf_test = epf_get_drvdata(epf);
888 const struct pci_epc_features *epc_features;
889 enum pci_barno test_reg_bar = BAR_0;
890 struct pci_epc *epc = epf->epc;
891
892 if (WARN_ON_ONCE(!epc))
893 return -EINVAL;
894
895 epc_features = pci_epc_get_features(epc, epf->func_no, epf->vfunc_no);
896 if (!epc_features) {
897 dev_err(&epf->dev, "epc_features not implemented\n");
898 return -EOPNOTSUPP;
899 }
900
901 test_reg_bar = pci_epc_get_first_free_bar(epc_features);
902 if (test_reg_bar < 0)
903 return -EINVAL;
904
905 epf_test->test_reg_bar = test_reg_bar;
906 epf_test->epc_features = epc_features;
907
908 ret = pci_epf_test_alloc_space(epf);
909 if (ret)
910 return ret;
911
912 return 0;
913 }
914
pci_epf_test_unbind(struct pci_epf * epf)915 static void pci_epf_test_unbind(struct pci_epf *epf)
916 {
917 struct pci_epf_test *epf_test = epf_get_drvdata(epf);
918 struct pci_epc *epc = epf->epc;
919
920 cancel_delayed_work(&epf_test->cmd_handler);
921 if (epc->init_complete) {
922 pci_epf_test_clean_dma_chan(epf_test);
923 pci_epf_test_clear_bar(epf);
924 }
925 pci_epf_test_free_space(epf);
926 }
927
928 static const struct pci_epf_device_id pci_epf_test_ids[] = {
929 {
930 .name = "pci_epf_test",
931 },
932 {},
933 };
934
pci_epf_test_probe(struct pci_epf * epf,const struct pci_epf_device_id * id)935 static int pci_epf_test_probe(struct pci_epf *epf,
936 const struct pci_epf_device_id *id)
937 {
938 struct pci_epf_test *epf_test;
939 struct device *dev = &epf->dev;
940
941 epf_test = devm_kzalloc(dev, sizeof(*epf_test), GFP_KERNEL);
942 if (!epf_test)
943 return -ENOMEM;
944
945 epf->header = &test_header;
946 epf_test->epf = epf;
947
948 INIT_DELAYED_WORK(&epf_test->cmd_handler, pci_epf_test_cmd_handler);
949
950 epf->event_ops = &pci_epf_test_event_ops;
951
952 epf_set_drvdata(epf, epf_test);
953 return 0;
954 }
955
956 static const struct pci_epf_ops ops = {
957 .unbind = pci_epf_test_unbind,
958 .bind = pci_epf_test_bind,
959 };
960
961 static struct pci_epf_driver test_driver = {
962 .driver.name = "pci_epf_test",
963 .probe = pci_epf_test_probe,
964 .id_table = pci_epf_test_ids,
965 .ops = &ops,
966 .owner = THIS_MODULE,
967 };
968
pci_epf_test_init(void)969 static int __init pci_epf_test_init(void)
970 {
971 int ret;
972
973 kpcitest_workqueue = alloc_workqueue("kpcitest",
974 WQ_MEM_RECLAIM | WQ_HIGHPRI, 0);
975 if (!kpcitest_workqueue) {
976 pr_err("Failed to allocate the kpcitest work queue\n");
977 return -ENOMEM;
978 }
979
980 ret = pci_epf_register_driver(&test_driver);
981 if (ret) {
982 destroy_workqueue(kpcitest_workqueue);
983 pr_err("Failed to register pci epf test driver --> %d\n", ret);
984 return ret;
985 }
986
987 return 0;
988 }
989 module_init(pci_epf_test_init);
990
pci_epf_test_exit(void)991 static void __exit pci_epf_test_exit(void)
992 {
993 if (kpcitest_workqueue)
994 destroy_workqueue(kpcitest_workqueue);
995 pci_epf_unregister_driver(&test_driver);
996 }
997 module_exit(pci_epf_test_exit);
998
999 MODULE_DESCRIPTION("PCI EPF TEST DRIVER");
1000 MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>");
1001 MODULE_LICENSE("GPL v2");
1002