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33#include <asm-generic/kmap_types.h>
34#include <linux/kernel.h>
35#include <linux/module.h>
36#include <linux/mlx5/driver.h>
37#include <linux/mlx5/cmd.h>
38#include "mlx5_core.h"
39
40enum {
41 MLX5_PAGES_CANT_GIVE = 0,
42 MLX5_PAGES_GIVE = 1,
43 MLX5_PAGES_TAKE = 2
44};
45
46enum {
47 MLX5_BOOT_PAGES = 1,
48 MLX5_INIT_PAGES = 2,
49 MLX5_POST_INIT_PAGES = 3
50};
51
52struct mlx5_pages_req {
53 struct mlx5_core_dev *dev;
54 u32 func_id;
55 s32 npages;
56 struct work_struct work;
57};
58
59struct fw_page {
60 struct rb_node rb_node;
61 u64 addr;
62 struct page *page;
63 u16 func_id;
64};
65
66struct mlx5_query_pages_inbox {
67 struct mlx5_inbox_hdr hdr;
68 u8 rsvd[8];
69};
70
71struct mlx5_query_pages_outbox {
72 struct mlx5_outbox_hdr hdr;
73 __be16 rsvd;
74 __be16 func_id;
75 __be32 num_pages;
76};
77
78struct mlx5_manage_pages_inbox {
79 struct mlx5_inbox_hdr hdr;
80 __be16 rsvd;
81 __be16 func_id;
82 __be32 num_entries;
83 __be64 pas[0];
84};
85
86struct mlx5_manage_pages_outbox {
87 struct mlx5_outbox_hdr hdr;
88 __be32 num_entries;
89 u8 rsvd[4];
90 __be64 pas[0];
91};
92
93static int insert_page(struct mlx5_core_dev *dev, u64 addr, struct page *page, u16 func_id)
94{
95 struct rb_root *root = &dev->priv.page_root;
96 struct rb_node **new = &root->rb_node;
97 struct rb_node *parent = NULL;
98 struct fw_page *nfp;
99 struct fw_page *tfp;
100
101 while (*new) {
102 parent = *new;
103 tfp = rb_entry(parent, struct fw_page, rb_node);
104 if (tfp->addr < addr)
105 new = &parent->rb_left;
106 else if (tfp->addr > addr)
107 new = &parent->rb_right;
108 else
109 return -EEXIST;
110 }
111
112 nfp = kmalloc(sizeof(*nfp), GFP_KERNEL);
113 if (!nfp)
114 return -ENOMEM;
115
116 nfp->addr = addr;
117 nfp->page = page;
118 nfp->func_id = func_id;
119
120 rb_link_node(&nfp->rb_node, parent, new);
121 rb_insert_color(&nfp->rb_node, root);
122
123 return 0;
124}
125
126static struct page *remove_page(struct mlx5_core_dev *dev, u64 addr)
127{
128 struct rb_root *root = &dev->priv.page_root;
129 struct rb_node *tmp = root->rb_node;
130 struct page *result = NULL;
131 struct fw_page *tfp;
132
133 while (tmp) {
134 tfp = rb_entry(tmp, struct fw_page, rb_node);
135 if (tfp->addr < addr) {
136 tmp = tmp->rb_left;
137 } else if (tfp->addr > addr) {
138 tmp = tmp->rb_right;
139 } else {
140 rb_erase(&tfp->rb_node, root);
141 result = tfp->page;
142 kfree(tfp);
143 break;
144 }
145 }
146
147 return result;
148}
149
150static int mlx5_cmd_query_pages(struct mlx5_core_dev *dev, u16 *func_id,
151 s32 *npages, int boot)
152{
153 struct mlx5_query_pages_inbox in;
154 struct mlx5_query_pages_outbox out;
155 int err;
156
157 memset(&in, 0, sizeof(in));
158 memset(&out, 0, sizeof(out));
159 in.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_QUERY_PAGES);
160 in.hdr.opmod = boot ? cpu_to_be16(MLX5_BOOT_PAGES) : cpu_to_be16(MLX5_INIT_PAGES);
161
162 err = mlx5_cmd_exec(dev, &in, sizeof(in), &out, sizeof(out));
163 if (err)
164 return err;
165
166 if (out.hdr.status)
167 return mlx5_cmd_status_to_err(&out.hdr);
168
169 *npages = be32_to_cpu(out.num_pages);
170 *func_id = be16_to_cpu(out.func_id);
171
172 return err;
173}
174
175static int give_pages(struct mlx5_core_dev *dev, u16 func_id, int npages,
176 int notify_fail)
177{
178 struct mlx5_manage_pages_inbox *in;
179 struct mlx5_manage_pages_outbox out;
180 struct page *page;
181 int inlen;
182 u64 addr;
183 int err;
184 int i;
185
186 inlen = sizeof(*in) + npages * sizeof(in->pas[0]);
187 in = mlx5_vzalloc(inlen);
188 if (!in) {
189 mlx5_core_warn(dev, "vzalloc failed %d\n", inlen);
190 return -ENOMEM;
191 }
192 memset(&out, 0, sizeof(out));
193
194 for (i = 0; i < npages; i++) {
195 page = alloc_page(GFP_HIGHUSER);
196 if (!page) {
197 err = -ENOMEM;
198 mlx5_core_warn(dev, "failed to allocate page\n");
199 goto out_alloc;
200 }
201 addr = dma_map_page(&dev->pdev->dev, page, 0,
202 PAGE_SIZE, DMA_BIDIRECTIONAL);
203 if (dma_mapping_error(&dev->pdev->dev, addr)) {
204 mlx5_core_warn(dev, "failed dma mapping page\n");
205 __free_page(page);
206 err = -ENOMEM;
207 goto out_alloc;
208 }
209 err = insert_page(dev, addr, page, func_id);
210 if (err) {
211 mlx5_core_err(dev, "failed to track allocated page\n");
212 dma_unmap_page(&dev->pdev->dev, addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
213 __free_page(page);
214 err = -ENOMEM;
215 goto out_alloc;
216 }
217 in->pas[i] = cpu_to_be64(addr);
218 }
219
220 in->hdr.opcode = cpu_to_be16(MLX5_CMD_OP_MANAGE_PAGES);
221 in->hdr.opmod = cpu_to_be16(MLX5_PAGES_GIVE);
222 in->func_id = cpu_to_be16(func_id);
223 in->num_entries = cpu_to_be32(npages);
224 err = mlx5_cmd_exec(dev, in, inlen, &out, sizeof(out));
225 mlx5_core_dbg(dev, "err %d\n", err);
226 if (err) {
227 mlx5_core_warn(dev, "func_id 0x%x, npages %d, err %d\n", func_id, npages, err);
228 goto out_alloc;
229 }
230 dev->priv.fw_pages += npages;
231
232 if (out.hdr.status) {
233 err = mlx5_cmd_status_to_err(&out.hdr);
234 if (err) {
235 mlx5_core_warn(dev, "func_id 0x%x, npages %d, status %d\n", func_id, npages, out.hdr.status);
236 goto out_alloc;
237 }
238 }
239
240 mlx5_core_dbg(dev, "err %d\n", err);
241
242 goto out_free;
243
244out_alloc:
245 if (notify_fail) {
246 memset(in, 0, inlen);
247 memset(&out, 0, sizeof(out));
248 in->hdr.opcode = cpu_to_be16(MLX5_CMD_OP_MANAGE_PAGES);
249 in->hdr.opmod = cpu_to_be16(MLX5_PAGES_CANT_GIVE);
250 if (mlx5_cmd_exec(dev, in, sizeof(*in), &out, sizeof(out)))
251 mlx5_core_warn(dev, "\n");
252 }
253 for (i--; i >= 0; i--) {
254 addr = be64_to_cpu(in->pas[i]);
255 page = remove_page(dev, addr);
256 if (!page) {
257 mlx5_core_err(dev, "BUG: can't remove page at addr 0x%llx\n",
258 addr);
259 continue;
260 }
261 dma_unmap_page(&dev->pdev->dev, addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
262 __free_page(page);
263 }
264
265out_free:
266 mlx5_vfree(in);
267 return err;
268}
269
270static int reclaim_pages(struct mlx5_core_dev *dev, u32 func_id, int npages,
271 int *nclaimed)
272{
273 struct mlx5_manage_pages_inbox in;
274 struct mlx5_manage_pages_outbox *out;
275 struct page *page;
276 int num_claimed;
277 int outlen;
278 u64 addr;
279 int err;
280 int i;
281
282 memset(&in, 0, sizeof(in));
283 outlen = sizeof(*out) + npages * sizeof(out->pas[0]);
284 out = mlx5_vzalloc(outlen);
285 if (!out)
286 return -ENOMEM;
287
288 in.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_MANAGE_PAGES);
289 in.hdr.opmod = cpu_to_be16(MLX5_PAGES_TAKE);
290 in.func_id = cpu_to_be16(func_id);
291 in.num_entries = cpu_to_be32(npages);
292 mlx5_core_dbg(dev, "npages %d, outlen %d\n", npages, outlen);
293 err = mlx5_cmd_exec(dev, &in, sizeof(in), out, outlen);
294 if (err) {
295 mlx5_core_err(dev, "failed recliaming pages\n");
296 goto out_free;
297 }
298 dev->priv.fw_pages -= npages;
299
300 if (out->hdr.status) {
301 err = mlx5_cmd_status_to_err(&out->hdr);
302 goto out_free;
303 }
304
305 num_claimed = be32_to_cpu(out->num_entries);
306 if (nclaimed)
307 *nclaimed = num_claimed;
308
309 for (i = 0; i < num_claimed; i++) {
310 addr = be64_to_cpu(out->pas[i]);
311 page = remove_page(dev, addr);
312 if (!page) {
313 mlx5_core_warn(dev, "FW reported unknown DMA address 0x%llx\n", addr);
314 } else {
315 dma_unmap_page(&dev->pdev->dev, addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
316 __free_page(page);
317 }
318 }
319
320out_free:
321 mlx5_vfree(out);
322 return err;
323}
324
325static void pages_work_handler(struct work_struct *work)
326{
327 struct mlx5_pages_req *req = container_of(work, struct mlx5_pages_req, work);
328 struct mlx5_core_dev *dev = req->dev;
329 int err = 0;
330
331 if (req->npages < 0)
332 err = reclaim_pages(dev, req->func_id, -1 * req->npages, NULL);
333 else if (req->npages > 0)
334 err = give_pages(dev, req->func_id, req->npages, 1);
335
336 if (err)
337 mlx5_core_warn(dev, "%s fail %d\n", req->npages < 0 ?
338 "reclaim" : "give", err);
339
340 kfree(req);
341}
342
343void mlx5_core_req_pages_handler(struct mlx5_core_dev *dev, u16 func_id,
344 s32 npages)
345{
346 struct mlx5_pages_req *req;
347
348 req = kzalloc(sizeof(*req), GFP_ATOMIC);
349 if (!req) {
350 mlx5_core_warn(dev, "failed to allocate pages request\n");
351 return;
352 }
353
354 req->dev = dev;
355 req->func_id = func_id;
356 req->npages = npages;
357 INIT_WORK(&req->work, pages_work_handler);
358 queue_work(dev->priv.pg_wq, &req->work);
359}
360
361int mlx5_satisfy_startup_pages(struct mlx5_core_dev *dev, int boot)
362{
363 u16 uninitialized_var(func_id);
364 s32 uninitialized_var(npages);
365 int err;
366
367 err = mlx5_cmd_query_pages(dev, &func_id, &npages, boot);
368 if (err)
369 return err;
370
371 mlx5_core_dbg(dev, "requested %d %s pages for func_id 0x%x\n",
372 npages, boot ? "boot" : "init", func_id);
373
374 return give_pages(dev, func_id, npages, 0);
375}
376
377static int optimal_reclaimed_pages(void)
378{
379 struct mlx5_cmd_prot_block *block;
380 struct mlx5_cmd_layout *lay;
381 int ret;
382
383 ret = (sizeof(lay->in) + sizeof(block->data) -
384 sizeof(struct mlx5_manage_pages_outbox)) / 8;
385
386 return ret;
387}
388
389int mlx5_reclaim_startup_pages(struct mlx5_core_dev *dev)
390{
391 unsigned long end = jiffies + msecs_to_jiffies(5000);
392 struct fw_page *fwp;
393 struct rb_node *p;
394 int err;
395
396 do {
397 p = rb_first(&dev->priv.page_root);
398 if (p) {
399 fwp = rb_entry(p, struct fw_page, rb_node);
400 err = reclaim_pages(dev, fwp->func_id, optimal_reclaimed_pages(), NULL);
401 if (err) {
402 mlx5_core_warn(dev, "failed reclaiming pages (%d)\n", err);
403 return err;
404 }
405 }
406 if (time_after(jiffies, end)) {
407 mlx5_core_warn(dev, "FW did not return all pages. giving up...\n");
408 break;
409 }
410 } while (p);
411
412 return 0;
413}
414
415void mlx5_pagealloc_init(struct mlx5_core_dev *dev)
416{
417 dev->priv.page_root = RB_ROOT;
418}
419
420void mlx5_pagealloc_cleanup(struct mlx5_core_dev *dev)
421{
422
423}
424
425int mlx5_pagealloc_start(struct mlx5_core_dev *dev)
426{
427 dev->priv.pg_wq = create_singlethread_workqueue("mlx5_page_allocator");
428 if (!dev->priv.pg_wq)
429 return -ENOMEM;
430
431 return 0;
432}
433
434void mlx5_pagealloc_stop(struct mlx5_core_dev *dev)
435{
436 destroy_workqueue(dev->priv.pg_wq);
437}
438
