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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
93enum {
94 MAX_RECLAIM_TIME_MSECS = 5000,
95};
96
97static int insert_page(struct mlx5_core_dev *dev, u64 addr, struct page *page, u16 func_id)
98{
99 struct rb_root *root = &dev->priv.page_root;
100 struct rb_node **new = &root->rb_node;
101 struct rb_node *parent = NULL;
102 struct fw_page *nfp;
103 struct fw_page *tfp;
104
105 while (*new) {
106 parent = *new;
107 tfp = rb_entry(parent, struct fw_page, rb_node);
108 if (tfp->addr < addr)
109 new = &parent->rb_left;
110 else if (tfp->addr > addr)
111 new = &parent->rb_right;
112 else
113 return -EEXIST;
114 }
115
116 nfp = kmalloc(sizeof(*nfp), GFP_KERNEL);
117 if (!nfp)
118 return -ENOMEM;
119
120 nfp->addr = addr;
121 nfp->page = page;
122 nfp->func_id = func_id;
123
124 rb_link_node(&nfp->rb_node, parent, new);
125 rb_insert_color(&nfp->rb_node, root);
126
127 return 0;
128}
129
130static struct page *remove_page(struct mlx5_core_dev *dev, u64 addr)
131{
132 struct rb_root *root = &dev->priv.page_root;
133 struct rb_node *tmp = root->rb_node;
134 struct page *result = NULL;
135 struct fw_page *tfp;
136
137 while (tmp) {
138 tfp = rb_entry(tmp, struct fw_page, rb_node);
139 if (tfp->addr < addr) {
140 tmp = tmp->rb_left;
141 } else if (tfp->addr > addr) {
142 tmp = tmp->rb_right;
143 } else {
144 rb_erase(&tfp->rb_node, root);
145 result = tfp->page;
146 kfree(tfp);
147 break;
148 }
149 }
150
151 return result;
152}
153
154static int mlx5_cmd_query_pages(struct mlx5_core_dev *dev, u16 *func_id,
155 s32 *npages, int boot)
156{
157 struct mlx5_query_pages_inbox in;
158 struct mlx5_query_pages_outbox out;
159 int err;
160
161 memset(&in, 0, sizeof(in));
162 memset(&out, 0, sizeof(out));
163 in.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_QUERY_PAGES);
164 in.hdr.opmod = boot ? cpu_to_be16(MLX5_BOOT_PAGES) : cpu_to_be16(MLX5_INIT_PAGES);
165
166 err = mlx5_cmd_exec(dev, &in, sizeof(in), &out, sizeof(out));
167 if (err)
168 return err;
169
170 if (out.hdr.status)
171 return mlx5_cmd_status_to_err(&out.hdr);
172
173 *npages = be32_to_cpu(out.num_pages);
174 *func_id = be16_to_cpu(out.func_id);
175
176 return err;
177}
178
179static int give_pages(struct mlx5_core_dev *dev, u16 func_id, int npages,
180 int notify_fail)
181{
182 struct mlx5_manage_pages_inbox *in;
183 struct mlx5_manage_pages_outbox out;
184 struct page *page;
185 int inlen;
186 u64 addr;
187 int err;
188 int i;
189
190 inlen = sizeof(*in) + npages * sizeof(in->pas[0]);
191 in = mlx5_vzalloc(inlen);
192 if (!in) {
193 mlx5_core_warn(dev, "vzalloc failed %d\n", inlen);
194 return -ENOMEM;
195 }
196 memset(&out, 0, sizeof(out));
197
198 for (i = 0; i < npages; i++) {
199 page = alloc_page(GFP_HIGHUSER);
200 if (!page) {
201 err = -ENOMEM;
202 mlx5_core_warn(dev, "failed to allocate page\n");
203 goto out_alloc;
204 }
205 addr = dma_map_page(&dev->pdev->dev, page, 0,
206 PAGE_SIZE, DMA_BIDIRECTIONAL);
207 if (dma_mapping_error(&dev->pdev->dev, addr)) {
208 mlx5_core_warn(dev, "failed dma mapping page\n");
209 __free_page(page);
210 err = -ENOMEM;
211 goto out_alloc;
212 }
213 err = insert_page(dev, addr, page, func_id);
214 if (err) {
215 mlx5_core_err(dev, "failed to track allocated page\n");
216 dma_unmap_page(&dev->pdev->dev, addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
217 __free_page(page);
218 err = -ENOMEM;
219 goto out_alloc;
220 }
221 in->pas[i] = cpu_to_be64(addr);
222 }
223
224 in->hdr.opcode = cpu_to_be16(MLX5_CMD_OP_MANAGE_PAGES);
225 in->hdr.opmod = cpu_to_be16(MLX5_PAGES_GIVE);
226 in->func_id = cpu_to_be16(func_id);
227 in->num_entries = cpu_to_be32(npages);
228 err = mlx5_cmd_exec(dev, in, inlen, &out, sizeof(out));
229 mlx5_core_dbg(dev, "err %d\n", err);
230 if (err) {
231 mlx5_core_warn(dev, "func_id 0x%x, npages %d, err %d\n", func_id, npages, err);
232 goto out_alloc;
233 }
234 dev->priv.fw_pages += npages;
235
236 if (out.hdr.status) {
237 err = mlx5_cmd_status_to_err(&out.hdr);
238 if (err) {
239 mlx5_core_warn(dev, "func_id 0x%x, npages %d, status %d\n", func_id, npages, out.hdr.status);
240 goto out_alloc;
241 }
242 }
243
244 mlx5_core_dbg(dev, "err %d\n", err);
245
246 goto out_free;
247
248out_alloc:
249 if (notify_fail) {
250 memset(in, 0, inlen);
251 memset(&out, 0, sizeof(out));
252 in->hdr.opcode = cpu_to_be16(MLX5_CMD_OP_MANAGE_PAGES);
253 in->hdr.opmod = cpu_to_be16(MLX5_PAGES_CANT_GIVE);
254 if (mlx5_cmd_exec(dev, in, sizeof(*in), &out, sizeof(out)))
255 mlx5_core_warn(dev, "\n");
256 }
257 for (i--; i >= 0; i--) {
258 addr = be64_to_cpu(in->pas[i]);
259 page = remove_page(dev, addr);
260 if (!page) {
261 mlx5_core_err(dev, "BUG: can't remove page at addr 0x%llx\n",
262 addr);
263 continue;
264 }
265 dma_unmap_page(&dev->pdev->dev, addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
266 __free_page(page);
267 }
268
269out_free:
270 mlx5_vfree(in);
271 return err;
272}
273
274static int reclaim_pages(struct mlx5_core_dev *dev, u32 func_id, int npages,
275 int *nclaimed)
276{
277 struct mlx5_manage_pages_inbox in;
278 struct mlx5_manage_pages_outbox *out;
279 struct page *page;
280 int num_claimed;
281 int outlen;
282 u64 addr;
283 int err;
284 int i;
285
286 if (nclaimed)
287 *nclaimed = 0;
288
289 memset(&in, 0, sizeof(in));
290 outlen = sizeof(*out) + npages * sizeof(out->pas[0]);
291 out = mlx5_vzalloc(outlen);
292 if (!out)
293 return -ENOMEM;
294
295 in.hdr.opcode = cpu_to_be16(MLX5_CMD_OP_MANAGE_PAGES);
296 in.hdr.opmod = cpu_to_be16(MLX5_PAGES_TAKE);
297 in.func_id = cpu_to_be16(func_id);
298 in.num_entries = cpu_to_be32(npages);
299 mlx5_core_dbg(dev, "npages %d, outlen %d\n", npages, outlen);
300 err = mlx5_cmd_exec(dev, &in, sizeof(in), out, outlen);
301 if (err) {
302 mlx5_core_err(dev, "failed recliaming pages\n");
303 goto out_free;
304 }
305 dev->priv.fw_pages -= npages;
306
307 if (out->hdr.status) {
308 err = mlx5_cmd_status_to_err(&out->hdr);
309 goto out_free;
310 }
311
312 num_claimed = be32_to_cpu(out->num_entries);
313 if (nclaimed)
314 *nclaimed = num_claimed;
315
316 for (i = 0; i < num_claimed; i++) {
317 addr = be64_to_cpu(out->pas[i]);
318 page = remove_page(dev, addr);
319 if (!page) {
320 mlx5_core_warn(dev, "FW reported unknown DMA address 0x%llx\n", addr);
321 } else {
322 dma_unmap_page(&dev->pdev->dev, addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
323 __free_page(page);
324 }
325 }
326
327out_free:
328 mlx5_vfree(out);
329 return err;
330}
331
332static void pages_work_handler(struct work_struct *work)
333{
334 struct mlx5_pages_req *req = container_of(work, struct mlx5_pages_req, work);
335 struct mlx5_core_dev *dev = req->dev;
336 int err = 0;
337
338 if (req->npages < 0)
339 err = reclaim_pages(dev, req->func_id, -1 * req->npages, NULL);
340 else if (req->npages > 0)
341 err = give_pages(dev, req->func_id, req->npages, 1);
342
343 if (err)
344 mlx5_core_warn(dev, "%s fail %d\n", req->npages < 0 ?
345 "reclaim" : "give", err);
346
347 kfree(req);
348}
349
350void mlx5_core_req_pages_handler(struct mlx5_core_dev *dev, u16 func_id,
351 s32 npages)
352{
353 struct mlx5_pages_req *req;
354
355 req = kzalloc(sizeof(*req), GFP_ATOMIC);
356 if (!req) {
357 mlx5_core_warn(dev, "failed to allocate pages request\n");
358 return;
359 }
360
361 req->dev = dev;
362 req->func_id = func_id;
363 req->npages = npages;
364 INIT_WORK(&req->work, pages_work_handler);
365 queue_work(dev->priv.pg_wq, &req->work);
366}
367
368int mlx5_satisfy_startup_pages(struct mlx5_core_dev *dev, int boot)
369{
370 u16 uninitialized_var(func_id);
371 s32 uninitialized_var(npages);
372 int err;
373
374 err = mlx5_cmd_query_pages(dev, &func_id, &npages, boot);
375 if (err)
376 return err;
377
378 mlx5_core_dbg(dev, "requested %d %s pages for func_id 0x%x\n",
379 npages, boot ? "boot" : "init", func_id);
380
381 return give_pages(dev, func_id, npages, 0);
382}
383
384static int optimal_reclaimed_pages(void)
385{
386 struct mlx5_cmd_prot_block *block;
387 struct mlx5_cmd_layout *lay;
388 int ret;
389
390 ret = (sizeof(lay->in) + sizeof(block->data) -
391 sizeof(struct mlx5_manage_pages_outbox)) / 8;
392
393 return ret;
394}
395
396int mlx5_reclaim_startup_pages(struct mlx5_core_dev *dev)
397{
398 unsigned long end = jiffies + msecs_to_jiffies(MAX_RECLAIM_TIME_MSECS);
399 struct fw_page *fwp;
400 struct rb_node *p;
401 int nclaimed = 0;
402 int err;
403
404 do {
405 p = rb_first(&dev->priv.page_root);
406 if (p) {
407 fwp = rb_entry(p, struct fw_page, rb_node);
408 err = reclaim_pages(dev, fwp->func_id,
409 optimal_reclaimed_pages(),
410 &nclaimed);
411 if (err) {
412 mlx5_core_warn(dev, "failed reclaiming pages (%d)\n", err);
413 return err;
414 }
415 if (nclaimed)
416 end = jiffies + msecs_to_jiffies(MAX_RECLAIM_TIME_MSECS);
417 }
418 if (time_after(jiffies, end)) {
419 mlx5_core_warn(dev, "FW did not return all pages. giving up...\n");
420 break;
421 }
422 } while (p);
423
424 return 0;
425}
426
427void mlx5_pagealloc_init(struct mlx5_core_dev *dev)
428{
429 dev->priv.page_root = RB_ROOT;
430}
431
432void mlx5_pagealloc_cleanup(struct mlx5_core_dev *dev)
433{
434
435}
436
437int mlx5_pagealloc_start(struct mlx5_core_dev *dev)
438{
439 dev->priv.pg_wq = create_singlethread_workqueue("mlx5_page_allocator");
440 if (!dev->priv.pg_wq)
441 return -ENOMEM;
442
443 return 0;
444}
445
446void mlx5_pagealloc_stop(struct mlx5_core_dev *dev)
447{
448 destroy_workqueue(dev->priv.pg_wq);
449}
450
