1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Huawei HiNIC PCI Express Linux driver
4  * Copyright(c) 2017 Huawei Technologies Co., Ltd
5  */
6 
7 #include <linux/kernel.h>
8 #include <linux/types.h>
9 #include <linux/pci.h>
10 #include <linux/device.h>
11 #include <linux/dma-mapping.h>
12 #include <linux/slab.h>
13 #include <linux/atomic.h>
14 #include <linux/semaphore.h>
15 #include <linux/errno.h>
16 #include <linux/vmalloc.h>
17 #include <linux/err.h>
18 #include <asm/byteorder.h>
19 
20 #include "hinic_hw_if.h"
21 #include "hinic_hw_wqe.h"
22 #include "hinic_hw_wq.h"
23 #include "hinic_hw_cmdq.h"
24 
25 #define WQS_BLOCKS_PER_PAGE             4
26 
27 #define WQ_BLOCK_SIZE                   4096
28 #define WQS_PAGE_SIZE                   (WQS_BLOCKS_PER_PAGE * WQ_BLOCK_SIZE)
29 
30 #define WQS_MAX_NUM_BLOCKS              128
31 #define WQS_FREE_BLOCKS_SIZE(wqs)       (WQS_MAX_NUM_BLOCKS * \
32 					 sizeof((wqs)->free_blocks[0]))
33 
34 #define WQ_SIZE(wq)                     ((wq)->q_depth * (wq)->wqebb_size)
35 
36 #define WQ_PAGE_ADDR_SIZE               sizeof(u64)
37 #define WQ_MAX_PAGES                    (WQ_BLOCK_SIZE / WQ_PAGE_ADDR_SIZE)
38 
39 #define CMDQ_BLOCK_SIZE                 512
40 #define CMDQ_PAGE_SIZE                  4096
41 
42 #define CMDQ_WQ_MAX_PAGES               (CMDQ_BLOCK_SIZE / WQ_PAGE_ADDR_SIZE)
43 
44 #define WQ_BASE_VADDR(wqs, wq)          \
45 			((void *)((wqs)->page_vaddr[(wq)->page_idx]) \
46 				+ (wq)->block_idx * WQ_BLOCK_SIZE)
47 
48 #define WQ_BASE_PADDR(wqs, wq)          \
49 			((wqs)->page_paddr[(wq)->page_idx] \
50 				+ (wq)->block_idx * WQ_BLOCK_SIZE)
51 
52 #define WQ_BASE_ADDR(wqs, wq)           \
53 			((void *)((wqs)->shadow_page_vaddr[(wq)->page_idx]) \
54 				+ (wq)->block_idx * WQ_BLOCK_SIZE)
55 
56 #define CMDQ_BASE_VADDR(cmdq_pages, wq) \
57 			((void *)((cmdq_pages)->page_vaddr) \
58 				+ (wq)->block_idx * CMDQ_BLOCK_SIZE)
59 
60 #define CMDQ_BASE_PADDR(cmdq_pages, wq) \
61 			((cmdq_pages)->page_paddr \
62 				+ (wq)->block_idx * CMDQ_BLOCK_SIZE)
63 
64 #define CMDQ_BASE_ADDR(cmdq_pages, wq)  \
65 			((void *)((cmdq_pages)->shadow_page_vaddr) \
66 				+ (wq)->block_idx * CMDQ_BLOCK_SIZE)
67 
68 #define WQ_PAGE_ADDR(wq, idx)           \
69 			((wq)->shadow_block_vaddr[WQE_PAGE_NUM(wq, idx)])
70 
71 #define MASKED_WQE_IDX(wq, idx)         ((idx) & (wq)->mask)
72 
73 #define WQE_IN_RANGE(wqe, start, end)   \
74 		(((unsigned long)(wqe) >= (unsigned long)(start)) && \
75 		 ((unsigned long)(wqe) < (unsigned long)(end)))
76 
77 #define WQE_SHADOW_PAGE(wq, wqe)        \
78 		(((unsigned long)(wqe) - (unsigned long)(wq)->shadow_wqe) \
79 			/ (wq)->max_wqe_size)
80 
WQE_PAGE_OFF(struct hinic_wq * wq,u16 idx)81 static inline int WQE_PAGE_OFF(struct hinic_wq *wq, u16 idx)
82 {
83 	return (((idx) & ((wq)->num_wqebbs_per_page - 1))
84 		<< (wq)->wqebb_size_shift);
85 }
86 
WQE_PAGE_NUM(struct hinic_wq * wq,u16 idx)87 static inline int WQE_PAGE_NUM(struct hinic_wq *wq, u16 idx)
88 {
89 	return (((idx) >> ((wq)->wqebbs_per_page_shift))
90 		& ((wq)->num_q_pages - 1));
91 }
92 
93 /**
94  * queue_alloc_page - allocate page for Queue
95  * @hwif: HW interface for allocating DMA
96  * @vaddr: virtual address will be returned in this address
97  * @paddr: physical address will be returned in this address
98  * @shadow_vaddr: VM area will be return here for holding WQ page addresses
99  * @page_sz: page size of each WQ page
100  *
101  * Return 0 - Success, negative - Failure
102  **/
queue_alloc_page(struct hinic_hwif * hwif,u64 ** vaddr,u64 * paddr,void *** shadow_vaddr,size_t page_sz)103 static int queue_alloc_page(struct hinic_hwif *hwif, u64 **vaddr, u64 *paddr,
104 			    void ***shadow_vaddr, size_t page_sz)
105 {
106 	struct pci_dev *pdev = hwif->pdev;
107 	dma_addr_t dma_addr;
108 
109 	*vaddr = dma_alloc_coherent(&pdev->dev, page_sz, &dma_addr,
110 				    GFP_KERNEL);
111 	if (!*vaddr) {
112 		dev_err(&pdev->dev, "Failed to allocate dma for wqs page\n");
113 		return -ENOMEM;
114 	}
115 
116 	*paddr = (u64)dma_addr;
117 
118 	/* use vzalloc for big mem */
119 	*shadow_vaddr = vzalloc(page_sz);
120 	if (!*shadow_vaddr)
121 		goto err_shadow_vaddr;
122 
123 	return 0;
124 
125 err_shadow_vaddr:
126 	dma_free_coherent(&pdev->dev, page_sz, *vaddr, dma_addr);
127 	return -ENOMEM;
128 }
129 
130 /**
131  * wqs_allocate_page - allocate page for WQ set
132  * @wqs: Work Queue Set
133  * @page_idx: the page index of the page will be allocated
134  *
135  * Return 0 - Success, negative - Failure
136  **/
wqs_allocate_page(struct hinic_wqs * wqs,int page_idx)137 static int wqs_allocate_page(struct hinic_wqs *wqs, int page_idx)
138 {
139 	return queue_alloc_page(wqs->hwif, &wqs->page_vaddr[page_idx],
140 				&wqs->page_paddr[page_idx],
141 				&wqs->shadow_page_vaddr[page_idx],
142 				WQS_PAGE_SIZE);
143 }
144 
145 /**
146  * wqs_free_page - free page of WQ set
147  * @wqs: Work Queue Set
148  * @page_idx: the page index of the page will be freed
149  **/
wqs_free_page(struct hinic_wqs * wqs,int page_idx)150 static void wqs_free_page(struct hinic_wqs *wqs, int page_idx)
151 {
152 	struct hinic_hwif *hwif = wqs->hwif;
153 	struct pci_dev *pdev = hwif->pdev;
154 
155 	dma_free_coherent(&pdev->dev, WQS_PAGE_SIZE,
156 			  wqs->page_vaddr[page_idx],
157 			  (dma_addr_t)wqs->page_paddr[page_idx]);
158 	vfree(wqs->shadow_page_vaddr[page_idx]);
159 }
160 
161 /**
162  * cmdq_allocate_page - allocate page for cmdq
163  * @cmdq_pages: the pages of the cmdq queue struct to hold the page
164  *
165  * Return 0 - Success, negative - Failure
166  **/
cmdq_allocate_page(struct hinic_cmdq_pages * cmdq_pages)167 static int cmdq_allocate_page(struct hinic_cmdq_pages *cmdq_pages)
168 {
169 	return queue_alloc_page(cmdq_pages->hwif, &cmdq_pages->page_vaddr,
170 				&cmdq_pages->page_paddr,
171 				&cmdq_pages->shadow_page_vaddr,
172 				CMDQ_PAGE_SIZE);
173 }
174 
175 /**
176  * cmdq_free_page - free page from cmdq
177  * @cmdq_pages: the pages of the cmdq queue struct that hold the page
178  *
179  * Return 0 - Success, negative - Failure
180  **/
cmdq_free_page(struct hinic_cmdq_pages * cmdq_pages)181 static void cmdq_free_page(struct hinic_cmdq_pages *cmdq_pages)
182 {
183 	struct hinic_hwif *hwif = cmdq_pages->hwif;
184 	struct pci_dev *pdev = hwif->pdev;
185 
186 	dma_free_coherent(&pdev->dev, CMDQ_PAGE_SIZE,
187 			  cmdq_pages->page_vaddr,
188 			  (dma_addr_t)cmdq_pages->page_paddr);
189 	vfree(cmdq_pages->shadow_page_vaddr);
190 }
191 
alloc_page_arrays(struct hinic_wqs * wqs)192 static int alloc_page_arrays(struct hinic_wqs *wqs)
193 {
194 	struct hinic_hwif *hwif = wqs->hwif;
195 	struct pci_dev *pdev = hwif->pdev;
196 
197 	wqs->page_paddr = devm_kcalloc(&pdev->dev, wqs->num_pages,
198 				       sizeof(*wqs->page_paddr), GFP_KERNEL);
199 	if (!wqs->page_paddr)
200 		return -ENOMEM;
201 
202 	wqs->page_vaddr = devm_kcalloc(&pdev->dev, wqs->num_pages,
203 				       sizeof(*wqs->page_vaddr), GFP_KERNEL);
204 	if (!wqs->page_vaddr)
205 		goto err_page_vaddr;
206 
207 	wqs->shadow_page_vaddr = devm_kcalloc(&pdev->dev, wqs->num_pages,
208 					      sizeof(*wqs->shadow_page_vaddr),
209 					      GFP_KERNEL);
210 	if (!wqs->shadow_page_vaddr)
211 		goto err_page_shadow_vaddr;
212 
213 	return 0;
214 
215 err_page_shadow_vaddr:
216 	devm_kfree(&pdev->dev, wqs->page_vaddr);
217 
218 err_page_vaddr:
219 	devm_kfree(&pdev->dev, wqs->page_paddr);
220 	return -ENOMEM;
221 }
222 
free_page_arrays(struct hinic_wqs * wqs)223 static void free_page_arrays(struct hinic_wqs *wqs)
224 {
225 	struct hinic_hwif *hwif = wqs->hwif;
226 	struct pci_dev *pdev = hwif->pdev;
227 
228 	devm_kfree(&pdev->dev, wqs->shadow_page_vaddr);
229 	devm_kfree(&pdev->dev, wqs->page_vaddr);
230 	devm_kfree(&pdev->dev, wqs->page_paddr);
231 }
232 
wqs_next_block(struct hinic_wqs * wqs,int * page_idx,int * block_idx)233 static int wqs_next_block(struct hinic_wqs *wqs, int *page_idx,
234 			  int *block_idx)
235 {
236 	int pos;
237 
238 	down(&wqs->alloc_blocks_lock);
239 
240 	wqs->num_free_blks--;
241 
242 	if (wqs->num_free_blks < 0) {
243 		wqs->num_free_blks++;
244 		up(&wqs->alloc_blocks_lock);
245 		return -ENOMEM;
246 	}
247 
248 	pos = wqs->alloc_blk_pos++;
249 	pos &= WQS_MAX_NUM_BLOCKS - 1;
250 
251 	*page_idx = wqs->free_blocks[pos].page_idx;
252 	*block_idx = wqs->free_blocks[pos].block_idx;
253 
254 	wqs->free_blocks[pos].page_idx = -1;
255 	wqs->free_blocks[pos].block_idx = -1;
256 
257 	up(&wqs->alloc_blocks_lock);
258 	return 0;
259 }
260 
wqs_return_block(struct hinic_wqs * wqs,int page_idx,int block_idx)261 static void wqs_return_block(struct hinic_wqs *wqs, int page_idx,
262 			     int block_idx)
263 {
264 	int pos;
265 
266 	down(&wqs->alloc_blocks_lock);
267 
268 	pos = wqs->return_blk_pos++;
269 	pos &= WQS_MAX_NUM_BLOCKS - 1;
270 
271 	wqs->free_blocks[pos].page_idx = page_idx;
272 	wqs->free_blocks[pos].block_idx = block_idx;
273 
274 	wqs->num_free_blks++;
275 
276 	up(&wqs->alloc_blocks_lock);
277 }
278 
init_wqs_blocks_arr(struct hinic_wqs * wqs)279 static void init_wqs_blocks_arr(struct hinic_wqs *wqs)
280 {
281 	int page_idx, blk_idx, pos = 0;
282 
283 	for (page_idx = 0; page_idx < wqs->num_pages; page_idx++) {
284 		for (blk_idx = 0; blk_idx < WQS_BLOCKS_PER_PAGE; blk_idx++) {
285 			wqs->free_blocks[pos].page_idx = page_idx;
286 			wqs->free_blocks[pos].block_idx = blk_idx;
287 			pos++;
288 		}
289 	}
290 
291 	wqs->alloc_blk_pos = 0;
292 	wqs->return_blk_pos = pos;
293 	wqs->num_free_blks = pos;
294 
295 	sema_init(&wqs->alloc_blocks_lock, 1);
296 }
297 
298 /**
299  * hinic_wqs_alloc - allocate Work Queues set
300  * @wqs: Work Queue Set
301  * @max_wqs: maximum wqs to allocate
302  * @hwif: HW interface for use for the allocation
303  *
304  * Return 0 - Success, negative - Failure
305  **/
hinic_wqs_alloc(struct hinic_wqs * wqs,int max_wqs,struct hinic_hwif * hwif)306 int hinic_wqs_alloc(struct hinic_wqs *wqs, int max_wqs,
307 		    struct hinic_hwif *hwif)
308 {
309 	struct pci_dev *pdev = hwif->pdev;
310 	int err, i, page_idx;
311 
312 	max_wqs = ALIGN(max_wqs, WQS_BLOCKS_PER_PAGE);
313 	if (max_wqs > WQS_MAX_NUM_BLOCKS)  {
314 		dev_err(&pdev->dev, "Invalid max_wqs = %d\n", max_wqs);
315 		return -EINVAL;
316 	}
317 
318 	wqs->hwif = hwif;
319 	wqs->num_pages = max_wqs / WQS_BLOCKS_PER_PAGE;
320 
321 	if (alloc_page_arrays(wqs)) {
322 		dev_err(&pdev->dev,
323 			"Failed to allocate mem for page addresses\n");
324 		return -ENOMEM;
325 	}
326 
327 	for (page_idx = 0; page_idx < wqs->num_pages; page_idx++) {
328 		err = wqs_allocate_page(wqs, page_idx);
329 		if (err) {
330 			dev_err(&pdev->dev, "Failed wq page allocation\n");
331 			goto err_wq_allocate_page;
332 		}
333 	}
334 
335 	wqs->free_blocks = devm_kzalloc(&pdev->dev, WQS_FREE_BLOCKS_SIZE(wqs),
336 					GFP_KERNEL);
337 	if (!wqs->free_blocks) {
338 		err = -ENOMEM;
339 		goto err_alloc_blocks;
340 	}
341 
342 	init_wqs_blocks_arr(wqs);
343 	return 0;
344 
345 err_alloc_blocks:
346 err_wq_allocate_page:
347 	for (i = 0; i < page_idx; i++)
348 		wqs_free_page(wqs, i);
349 
350 	free_page_arrays(wqs);
351 	return err;
352 }
353 
354 /**
355  * hinic_wqs_free - free Work Queues set
356  * @wqs: Work Queue Set
357  **/
hinic_wqs_free(struct hinic_wqs * wqs)358 void hinic_wqs_free(struct hinic_wqs *wqs)
359 {
360 	struct hinic_hwif *hwif = wqs->hwif;
361 	struct pci_dev *pdev = hwif->pdev;
362 	int page_idx;
363 
364 	devm_kfree(&pdev->dev, wqs->free_blocks);
365 
366 	for (page_idx = 0; page_idx < wqs->num_pages; page_idx++)
367 		wqs_free_page(wqs, page_idx);
368 
369 	free_page_arrays(wqs);
370 }
371 
372 /**
373  * alloc_wqes_shadow - allocate WQE shadows for WQ
374  * @wq: WQ to allocate shadows for
375  *
376  * Return 0 - Success, negative - Failure
377  **/
alloc_wqes_shadow(struct hinic_wq * wq)378 static int alloc_wqes_shadow(struct hinic_wq *wq)
379 {
380 	struct hinic_hwif *hwif = wq->hwif;
381 	struct pci_dev *pdev = hwif->pdev;
382 
383 	wq->shadow_wqe = devm_kcalloc(&pdev->dev, wq->num_q_pages,
384 				      wq->max_wqe_size, GFP_KERNEL);
385 	if (!wq->shadow_wqe)
386 		return -ENOMEM;
387 
388 	wq->shadow_idx = devm_kcalloc(&pdev->dev, wq->num_q_pages,
389 				      sizeof(*wq->shadow_idx), GFP_KERNEL);
390 	if (!wq->shadow_idx)
391 		goto err_shadow_idx;
392 
393 	return 0;
394 
395 err_shadow_idx:
396 	devm_kfree(&pdev->dev, wq->shadow_wqe);
397 	return -ENOMEM;
398 }
399 
400 /**
401  * free_wqes_shadow - free WQE shadows of WQ
402  * @wq: WQ to free shadows from
403  **/
free_wqes_shadow(struct hinic_wq * wq)404 static void free_wqes_shadow(struct hinic_wq *wq)
405 {
406 	struct hinic_hwif *hwif = wq->hwif;
407 	struct pci_dev *pdev = hwif->pdev;
408 
409 	devm_kfree(&pdev->dev, wq->shadow_idx);
410 	devm_kfree(&pdev->dev, wq->shadow_wqe);
411 }
412 
413 /**
414  * free_wq_pages - free pages of WQ
415  * @hwif: HW interface for releasing dma addresses
416  * @wq: WQ to free pages from
417  * @num_q_pages: number pages to free
418  **/
free_wq_pages(struct hinic_wq * wq,struct hinic_hwif * hwif,int num_q_pages)419 static void free_wq_pages(struct hinic_wq *wq, struct hinic_hwif *hwif,
420 			  int num_q_pages)
421 {
422 	struct pci_dev *pdev = hwif->pdev;
423 	int i;
424 
425 	for (i = 0; i < num_q_pages; i++) {
426 		void **vaddr = &wq->shadow_block_vaddr[i];
427 		u64 *paddr = &wq->block_vaddr[i];
428 		dma_addr_t dma_addr;
429 
430 		dma_addr = (dma_addr_t)be64_to_cpu(*paddr);
431 		dma_free_coherent(&pdev->dev, wq->wq_page_size, *vaddr,
432 				  dma_addr);
433 	}
434 
435 	free_wqes_shadow(wq);
436 }
437 
438 /**
439  * alloc_wq_pages - alloc pages for WQ
440  * @hwif: HW interface for allocating dma addresses
441  * @wq: WQ to allocate pages for
442  * @max_pages: maximum pages allowed
443  *
444  * Return 0 - Success, negative - Failure
445  **/
alloc_wq_pages(struct hinic_wq * wq,struct hinic_hwif * hwif,int max_pages)446 static int alloc_wq_pages(struct hinic_wq *wq, struct hinic_hwif *hwif,
447 			  int max_pages)
448 {
449 	struct pci_dev *pdev = hwif->pdev;
450 	int i, err, num_q_pages;
451 
452 	num_q_pages = ALIGN(WQ_SIZE(wq), wq->wq_page_size) / wq->wq_page_size;
453 	if (num_q_pages > max_pages) {
454 		dev_err(&pdev->dev, "Number wq pages exceeds the limit\n");
455 		return -EINVAL;
456 	}
457 
458 	if (num_q_pages & (num_q_pages - 1)) {
459 		dev_err(&pdev->dev, "Number wq pages must be power of 2\n");
460 		return -EINVAL;
461 	}
462 
463 	wq->num_q_pages = num_q_pages;
464 
465 	err = alloc_wqes_shadow(wq);
466 	if (err) {
467 		dev_err(&pdev->dev, "Failed to allocate wqe shadow\n");
468 		return err;
469 	}
470 
471 	for (i = 0; i < num_q_pages; i++) {
472 		void **vaddr = &wq->shadow_block_vaddr[i];
473 		u64 *paddr = &wq->block_vaddr[i];
474 		dma_addr_t dma_addr;
475 
476 		*vaddr = dma_alloc_coherent(&pdev->dev, wq->wq_page_size,
477 					    &dma_addr, GFP_KERNEL);
478 		if (!*vaddr) {
479 			dev_err(&pdev->dev, "Failed to allocate wq page\n");
480 			goto err_alloc_wq_pages;
481 		}
482 
483 		/* HW uses Big Endian Format */
484 		*paddr = cpu_to_be64(dma_addr);
485 	}
486 
487 	return 0;
488 
489 err_alloc_wq_pages:
490 	free_wq_pages(wq, hwif, i);
491 	return -ENOMEM;
492 }
493 
494 /**
495  * hinic_wq_allocate - Allocate the WQ resources from the WQS
496  * @wqs: WQ set from which to allocate the WQ resources
497  * @wq: WQ to allocate resources for it from the WQ set
498  * @wqebb_size: Work Queue Block Byte Size
499  * @wq_page_size: the page size in the Work Queue
500  * @q_depth: number of wqebbs in WQ
501  * @max_wqe_size: maximum WQE size that will be used in the WQ
502  *
503  * Return 0 - Success, negative - Failure
504  **/
hinic_wq_allocate(struct hinic_wqs * wqs,struct hinic_wq * wq,u16 wqebb_size,u32 wq_page_size,u16 q_depth,u16 max_wqe_size)505 int hinic_wq_allocate(struct hinic_wqs *wqs, struct hinic_wq *wq,
506 		      u16 wqebb_size, u32 wq_page_size, u16 q_depth,
507 		      u16 max_wqe_size)
508 {
509 	struct hinic_hwif *hwif = wqs->hwif;
510 	struct pci_dev *pdev = hwif->pdev;
511 	u16 num_wqebbs_per_page;
512 	u16 wqebb_size_shift;
513 	int err;
514 
515 	if (!is_power_of_2(wqebb_size)) {
516 		dev_err(&pdev->dev, "wqebb_size must be power of 2\n");
517 		return -EINVAL;
518 	}
519 
520 	if (wq_page_size == 0) {
521 		dev_err(&pdev->dev, "wq_page_size must be > 0\n");
522 		return -EINVAL;
523 	}
524 
525 	if (q_depth & (q_depth - 1)) {
526 		dev_err(&pdev->dev, "WQ q_depth must be power of 2\n");
527 		return -EINVAL;
528 	}
529 
530 	wqebb_size_shift = ilog2(wqebb_size);
531 	num_wqebbs_per_page = ALIGN(wq_page_size, wqebb_size)
532 				>> wqebb_size_shift;
533 
534 	if (!is_power_of_2(num_wqebbs_per_page)) {
535 		dev_err(&pdev->dev, "num wqebbs per page must be power of 2\n");
536 		return -EINVAL;
537 	}
538 
539 	wq->hwif = hwif;
540 
541 	err = wqs_next_block(wqs, &wq->page_idx, &wq->block_idx);
542 	if (err) {
543 		dev_err(&pdev->dev, "Failed to get free wqs next block\n");
544 		return err;
545 	}
546 
547 	wq->wqebb_size = wqebb_size;
548 	wq->wq_page_size = wq_page_size;
549 	wq->q_depth = q_depth;
550 	wq->max_wqe_size = max_wqe_size;
551 	wq->num_wqebbs_per_page = num_wqebbs_per_page;
552 	wq->wqebbs_per_page_shift = ilog2(num_wqebbs_per_page);
553 	wq->wqebb_size_shift = wqebb_size_shift;
554 	wq->block_vaddr = WQ_BASE_VADDR(wqs, wq);
555 	wq->shadow_block_vaddr = WQ_BASE_ADDR(wqs, wq);
556 	wq->block_paddr = WQ_BASE_PADDR(wqs, wq);
557 
558 	err = alloc_wq_pages(wq, wqs->hwif, WQ_MAX_PAGES);
559 	if (err) {
560 		dev_err(&pdev->dev, "Failed to allocate wq pages\n");
561 		goto err_alloc_wq_pages;
562 	}
563 
564 	atomic_set(&wq->cons_idx, 0);
565 	atomic_set(&wq->prod_idx, 0);
566 	atomic_set(&wq->delta, q_depth);
567 	wq->mask = q_depth - 1;
568 
569 	return 0;
570 
571 err_alloc_wq_pages:
572 	wqs_return_block(wqs, wq->page_idx, wq->block_idx);
573 	return err;
574 }
575 
576 /**
577  * hinic_wq_free - Free the WQ resources to the WQS
578  * @wqs: WQ set to free the WQ resources to it
579  * @wq: WQ to free its resources to the WQ set resources
580  **/
hinic_wq_free(struct hinic_wqs * wqs,struct hinic_wq * wq)581 void hinic_wq_free(struct hinic_wqs *wqs, struct hinic_wq *wq)
582 {
583 	free_wq_pages(wq, wqs->hwif, wq->num_q_pages);
584 
585 	wqs_return_block(wqs, wq->page_idx, wq->block_idx);
586 }
587 
588 /**
589  * hinic_wqs_cmdq_alloc - Allocate wqs for cmdqs
590  * @cmdq_pages: will hold the pages of the cmdq
591  * @wq: returned wqs
592  * @hwif: HW interface
593  * @cmdq_blocks: number of cmdq blocks/wq to allocate
594  * @wqebb_size: Work Queue Block Byte Size
595  * @wq_page_size: the page size in the Work Queue
596  * @q_depth: number of wqebbs in WQ
597  * @max_wqe_size: maximum WQE size that will be used in the WQ
598  *
599  * Return 0 - Success, negative - Failure
600  **/
hinic_wqs_cmdq_alloc(struct hinic_cmdq_pages * cmdq_pages,struct hinic_wq * wq,struct hinic_hwif * hwif,int cmdq_blocks,u16 wqebb_size,u32 wq_page_size,u16 q_depth,u16 max_wqe_size)601 int hinic_wqs_cmdq_alloc(struct hinic_cmdq_pages *cmdq_pages,
602 			 struct hinic_wq *wq, struct hinic_hwif *hwif,
603 			 int cmdq_blocks, u16 wqebb_size, u32 wq_page_size,
604 			 u16 q_depth, u16 max_wqe_size)
605 {
606 	struct pci_dev *pdev = hwif->pdev;
607 	u16 num_wqebbs_per_page_shift;
608 	u16 num_wqebbs_per_page;
609 	u16 wqebb_size_shift;
610 	int i, j, err = -ENOMEM;
611 
612 	if (!is_power_of_2(wqebb_size)) {
613 		dev_err(&pdev->dev, "wqebb_size must be power of 2\n");
614 		return -EINVAL;
615 	}
616 
617 	if (wq_page_size == 0) {
618 		dev_err(&pdev->dev, "wq_page_size must be > 0\n");
619 		return -EINVAL;
620 	}
621 
622 	if (q_depth & (q_depth - 1)) {
623 		dev_err(&pdev->dev, "WQ q_depth must be power of 2\n");
624 		return -EINVAL;
625 	}
626 
627 	wqebb_size_shift = ilog2(wqebb_size);
628 	num_wqebbs_per_page = ALIGN(wq_page_size, wqebb_size)
629 				>> wqebb_size_shift;
630 
631 	if (!is_power_of_2(num_wqebbs_per_page)) {
632 		dev_err(&pdev->dev, "num wqebbs per page must be power of 2\n");
633 		return -EINVAL;
634 	}
635 
636 	cmdq_pages->hwif = hwif;
637 
638 	err = cmdq_allocate_page(cmdq_pages);
639 	if (err) {
640 		dev_err(&pdev->dev, "Failed to allocate CMDQ page\n");
641 		return err;
642 	}
643 	num_wqebbs_per_page_shift = ilog2(num_wqebbs_per_page);
644 
645 	for (i = 0; i < cmdq_blocks; i++) {
646 		wq[i].hwif = hwif;
647 		wq[i].page_idx = 0;
648 		wq[i].block_idx = i;
649 
650 		wq[i].wqebb_size = wqebb_size;
651 		wq[i].wq_page_size = wq_page_size;
652 		wq[i].q_depth = q_depth;
653 		wq[i].max_wqe_size = max_wqe_size;
654 		wq[i].num_wqebbs_per_page = num_wqebbs_per_page;
655 		wq[i].wqebbs_per_page_shift = num_wqebbs_per_page_shift;
656 		wq[i].wqebb_size_shift = wqebb_size_shift;
657 		wq[i].block_vaddr = CMDQ_BASE_VADDR(cmdq_pages, &wq[i]);
658 		wq[i].shadow_block_vaddr = CMDQ_BASE_ADDR(cmdq_pages, &wq[i]);
659 		wq[i].block_paddr = CMDQ_BASE_PADDR(cmdq_pages, &wq[i]);
660 
661 		err = alloc_wq_pages(&wq[i], cmdq_pages->hwif,
662 				     CMDQ_WQ_MAX_PAGES);
663 		if (err) {
664 			dev_err(&pdev->dev, "Failed to alloc CMDQ blocks\n");
665 			goto err_cmdq_block;
666 		}
667 
668 		atomic_set(&wq[i].cons_idx, 0);
669 		atomic_set(&wq[i].prod_idx, 0);
670 		atomic_set(&wq[i].delta, q_depth);
671 		wq[i].mask = q_depth - 1;
672 	}
673 
674 	return 0;
675 
676 err_cmdq_block:
677 	for (j = 0; j < i; j++)
678 		free_wq_pages(&wq[j], cmdq_pages->hwif, wq[j].num_q_pages);
679 
680 	cmdq_free_page(cmdq_pages);
681 	return err;
682 }
683 
684 /**
685  * hinic_wqs_cmdq_free - Free wqs from cmdqs
686  * @cmdq_pages: hold the pages of the cmdq
687  * @wq: wqs to free
688  * @cmdq_blocks: number of wqs to free
689  **/
hinic_wqs_cmdq_free(struct hinic_cmdq_pages * cmdq_pages,struct hinic_wq * wq,int cmdq_blocks)690 void hinic_wqs_cmdq_free(struct hinic_cmdq_pages *cmdq_pages,
691 			 struct hinic_wq *wq, int cmdq_blocks)
692 {
693 	int i;
694 
695 	for (i = 0; i < cmdq_blocks; i++)
696 		free_wq_pages(&wq[i], cmdq_pages->hwif, wq[i].num_q_pages);
697 
698 	cmdq_free_page(cmdq_pages);
699 }
700 
copy_wqe_to_shadow(struct hinic_wq * wq,void * shadow_addr,int num_wqebbs,u16 idx)701 static void copy_wqe_to_shadow(struct hinic_wq *wq, void *shadow_addr,
702 			       int num_wqebbs, u16 idx)
703 {
704 	void *wqebb_addr;
705 	int i;
706 
707 	for (i = 0; i < num_wqebbs; i++, idx++) {
708 		idx = MASKED_WQE_IDX(wq, idx);
709 		wqebb_addr = WQ_PAGE_ADDR(wq, idx) +
710 			     WQE_PAGE_OFF(wq, idx);
711 
712 		memcpy(shadow_addr, wqebb_addr, wq->wqebb_size);
713 
714 		shadow_addr += wq->wqebb_size;
715 	}
716 }
717 
copy_wqe_from_shadow(struct hinic_wq * wq,void * shadow_addr,int num_wqebbs,u16 idx)718 static void copy_wqe_from_shadow(struct hinic_wq *wq, void *shadow_addr,
719 				 int num_wqebbs, u16 idx)
720 {
721 	void *wqebb_addr;
722 	int i;
723 
724 	for (i = 0; i < num_wqebbs; i++, idx++) {
725 		idx = MASKED_WQE_IDX(wq, idx);
726 		wqebb_addr = WQ_PAGE_ADDR(wq, idx) +
727 			     WQE_PAGE_OFF(wq, idx);
728 
729 		memcpy(wqebb_addr, shadow_addr, wq->wqebb_size);
730 		shadow_addr += wq->wqebb_size;
731 	}
732 }
733 
734 /**
735  * hinic_get_wqe - get wqe ptr in the current pi and update the pi
736  * @wq: wq to get wqe from
737  * @wqe_size: wqe size
738  * @prod_idx: returned pi
739  *
740  * Return wqe pointer
741  **/
hinic_get_wqe(struct hinic_wq * wq,unsigned int wqe_size,u16 * prod_idx)742 struct hinic_hw_wqe *hinic_get_wqe(struct hinic_wq *wq, unsigned int wqe_size,
743 				   u16 *prod_idx)
744 {
745 	int curr_pg, end_pg, num_wqebbs;
746 	u16 curr_prod_idx, end_prod_idx;
747 
748 	*prod_idx = MASKED_WQE_IDX(wq, atomic_read(&wq->prod_idx));
749 
750 	num_wqebbs = ALIGN(wqe_size, wq->wqebb_size) >> wq->wqebb_size_shift;
751 
752 	if (atomic_sub_return(num_wqebbs, &wq->delta) <= 0) {
753 		atomic_add(num_wqebbs, &wq->delta);
754 		return ERR_PTR(-EBUSY);
755 	}
756 
757 	end_prod_idx = atomic_add_return(num_wqebbs, &wq->prod_idx);
758 
759 	end_prod_idx = MASKED_WQE_IDX(wq, end_prod_idx);
760 	curr_prod_idx = end_prod_idx - num_wqebbs;
761 	curr_prod_idx = MASKED_WQE_IDX(wq, curr_prod_idx);
762 
763 	/* end prod index points to the next wqebb, therefore minus 1 */
764 	end_prod_idx = MASKED_WQE_IDX(wq, end_prod_idx - 1);
765 
766 	curr_pg = WQE_PAGE_NUM(wq, curr_prod_idx);
767 	end_pg = WQE_PAGE_NUM(wq, end_prod_idx);
768 
769 	*prod_idx = curr_prod_idx;
770 
771 	/* If we only have one page, still need to get shadown wqe when
772 	 * wqe rolling-over page
773 	 */
774 	if (curr_pg != end_pg || end_prod_idx < *prod_idx) {
775 		void *shadow_addr = &wq->shadow_wqe[curr_pg * wq->max_wqe_size];
776 
777 		copy_wqe_to_shadow(wq, shadow_addr, num_wqebbs, *prod_idx);
778 
779 		wq->shadow_idx[curr_pg] = *prod_idx;
780 		return shadow_addr;
781 	}
782 
783 	return WQ_PAGE_ADDR(wq, *prod_idx) + WQE_PAGE_OFF(wq, *prod_idx);
784 }
785 
786 /**
787  * hinic_return_wqe - return the wqe when transmit failed
788  * @wq: wq to return wqe
789  * @wqe_size: wqe size
790  **/
hinic_return_wqe(struct hinic_wq * wq,unsigned int wqe_size)791 void hinic_return_wqe(struct hinic_wq *wq, unsigned int wqe_size)
792 {
793 	int num_wqebbs = ALIGN(wqe_size, wq->wqebb_size) / wq->wqebb_size;
794 
795 	atomic_sub(num_wqebbs, &wq->prod_idx);
796 
797 	atomic_add(num_wqebbs, &wq->delta);
798 }
799 
800 /**
801  * hinic_put_wqe - return the wqe place to use for a new wqe
802  * @wq: wq to return wqe
803  * @wqe_size: wqe size
804  **/
hinic_put_wqe(struct hinic_wq * wq,unsigned int wqe_size)805 void hinic_put_wqe(struct hinic_wq *wq, unsigned int wqe_size)
806 {
807 	int num_wqebbs = ALIGN(wqe_size, wq->wqebb_size)
808 			>> wq->wqebb_size_shift;
809 
810 	atomic_add(num_wqebbs, &wq->cons_idx);
811 
812 	atomic_add(num_wqebbs, &wq->delta);
813 }
814 
815 /**
816  * hinic_read_wqe - read wqe ptr in the current ci
817  * @wq: wq to get read from
818  * @wqe_size: wqe size
819  * @cons_idx: returned ci
820  *
821  * Return wqe pointer
822  **/
hinic_read_wqe(struct hinic_wq * wq,unsigned int wqe_size,u16 * cons_idx)823 struct hinic_hw_wqe *hinic_read_wqe(struct hinic_wq *wq, unsigned int wqe_size,
824 				    u16 *cons_idx)
825 {
826 	int num_wqebbs = ALIGN(wqe_size, wq->wqebb_size)
827 			>> wq->wqebb_size_shift;
828 	u16 curr_cons_idx, end_cons_idx;
829 	int curr_pg, end_pg;
830 
831 	if ((atomic_read(&wq->delta) + num_wqebbs) > wq->q_depth)
832 		return ERR_PTR(-EBUSY);
833 
834 	curr_cons_idx = atomic_read(&wq->cons_idx);
835 
836 	curr_cons_idx = MASKED_WQE_IDX(wq, curr_cons_idx);
837 	end_cons_idx = MASKED_WQE_IDX(wq, curr_cons_idx + num_wqebbs - 1);
838 
839 	curr_pg = WQE_PAGE_NUM(wq, curr_cons_idx);
840 	end_pg = WQE_PAGE_NUM(wq, end_cons_idx);
841 
842 	*cons_idx = curr_cons_idx;
843 
844 	/* If we only have one page, still need to get shadown wqe when
845 	 * wqe rolling-over page
846 	 */
847 	if (curr_pg != end_pg || end_cons_idx < curr_cons_idx) {
848 		void *shadow_addr = &wq->shadow_wqe[curr_pg * wq->max_wqe_size];
849 
850 		copy_wqe_to_shadow(wq, shadow_addr, num_wqebbs, *cons_idx);
851 		return shadow_addr;
852 	}
853 
854 	return WQ_PAGE_ADDR(wq, *cons_idx) + WQE_PAGE_OFF(wq, *cons_idx);
855 }
856 
857 /**
858  * hinic_read_wqe_direct - read wqe directly from ci position
859  * @wq: wq
860  * @cons_idx: ci position
861  *
862  * Return wqe
863  **/
hinic_read_wqe_direct(struct hinic_wq * wq,u16 cons_idx)864 struct hinic_hw_wqe *hinic_read_wqe_direct(struct hinic_wq *wq, u16 cons_idx)
865 {
866 	return WQ_PAGE_ADDR(wq, cons_idx) + WQE_PAGE_OFF(wq, cons_idx);
867 }
868 
869 /**
870  * wqe_shadow - check if a wqe is shadow
871  * @wq: wq of the wqe
872  * @wqe: the wqe for shadow checking
873  *
874  * Return true - shadow, false - Not shadow
875  **/
wqe_shadow(struct hinic_wq * wq,struct hinic_hw_wqe * wqe)876 static inline bool wqe_shadow(struct hinic_wq *wq, struct hinic_hw_wqe *wqe)
877 {
878 	size_t wqe_shadow_size = wq->num_q_pages * wq->max_wqe_size;
879 
880 	return WQE_IN_RANGE(wqe, wq->shadow_wqe,
881 			    &wq->shadow_wqe[wqe_shadow_size]);
882 }
883 
884 /**
885  * hinic_write_wqe - write the wqe to the wq
886  * @wq: wq to write wqe to
887  * @wqe: wqe to write
888  * @wqe_size: wqe size
889  **/
hinic_write_wqe(struct hinic_wq * wq,struct hinic_hw_wqe * wqe,unsigned int wqe_size)890 void hinic_write_wqe(struct hinic_wq *wq, struct hinic_hw_wqe *wqe,
891 		     unsigned int wqe_size)
892 {
893 	int curr_pg, num_wqebbs;
894 	void *shadow_addr;
895 	u16 prod_idx;
896 
897 	if (wqe_shadow(wq, wqe)) {
898 		curr_pg = WQE_SHADOW_PAGE(wq, wqe);
899 
900 		prod_idx = wq->shadow_idx[curr_pg];
901 		num_wqebbs = ALIGN(wqe_size, wq->wqebb_size) / wq->wqebb_size;
902 		shadow_addr = &wq->shadow_wqe[curr_pg * wq->max_wqe_size];
903 
904 		copy_wqe_from_shadow(wq, shadow_addr, num_wqebbs, prod_idx);
905 	}
906 }
907