pvrdma_mr.c 8.8 KB

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  1. /*
  2. * Copyright (c) 2012-2016 VMware, Inc. All rights reserved.
  3. *
  4. * This program is free software; you can redistribute it and/or
  5. * modify it under the terms of EITHER the GNU General Public License
  6. * version 2 as published by the Free Software Foundation or the BSD
  7. * 2-Clause License. This program is distributed in the hope that it
  8. * will be useful, but WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED
  9. * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
  10. * See the GNU General Public License version 2 for more details at
  11. * http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html.
  12. *
  13. * You should have received a copy of the GNU General Public License
  14. * along with this program available in the file COPYING in the main
  15. * directory of this source tree.
  16. *
  17. * The BSD 2-Clause License
  18. *
  19. * Redistribution and use in source and binary forms, with or
  20. * without modification, are permitted provided that the following
  21. * conditions are met:
  22. *
  23. * - Redistributions of source code must retain the above
  24. * copyright notice, this list of conditions and the following
  25. * disclaimer.
  26. *
  27. * - Redistributions in binary form must reproduce the above
  28. * copyright notice, this list of conditions and the following
  29. * disclaimer in the documentation and/or other materials
  30. * provided with the distribution.
  31. *
  32. * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33. * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34. * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  35. * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  36. * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  37. * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  38. * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  39. * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  40. * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  41. * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  42. * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  43. * OF THE POSSIBILITY OF SUCH DAMAGE.
  44. */
  45. #include <linux/list.h>
  46. #include <linux/slab.h>
  47. #include "pvrdma.h"
  48. /**
  49. * pvrdma_get_dma_mr - get a DMA memory region
  50. * @pd: protection domain
  51. * @acc: access flags
  52. *
  53. * @return: ib_mr pointer on success, otherwise returns an errno.
  54. */
  55. struct ib_mr *pvrdma_get_dma_mr(struct ib_pd *pd, int acc)
  56. {
  57. struct pvrdma_dev *dev = to_vdev(pd->device);
  58. struct pvrdma_user_mr *mr;
  59. union pvrdma_cmd_req req;
  60. union pvrdma_cmd_resp rsp;
  61. struct pvrdma_cmd_create_mr *cmd = &req.create_mr;
  62. struct pvrdma_cmd_create_mr_resp *resp = &rsp.create_mr_resp;
  63. int ret;
  64. /* Support only LOCAL_WRITE flag for DMA MRs */
  65. if (acc & ~IB_ACCESS_LOCAL_WRITE) {
  66. dev_warn(&dev->pdev->dev,
  67. "unsupported dma mr access flags %#x\n", acc);
  68. return ERR_PTR(-EOPNOTSUPP);
  69. }
  70. mr = kzalloc(sizeof(*mr), GFP_KERNEL);
  71. if (!mr)
  72. return ERR_PTR(-ENOMEM);
  73. memset(cmd, 0, sizeof(*cmd));
  74. cmd->hdr.cmd = PVRDMA_CMD_CREATE_MR;
  75. cmd->pd_handle = to_vpd(pd)->pd_handle;
  76. cmd->access_flags = acc;
  77. cmd->flags = PVRDMA_MR_FLAG_DMA;
  78. ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_MR_RESP);
  79. if (ret < 0) {
  80. dev_warn(&dev->pdev->dev,
  81. "could not get DMA mem region, error: %d\n", ret);
  82. kfree(mr);
  83. return ERR_PTR(ret);
  84. }
  85. mr->mmr.mr_handle = resp->mr_handle;
  86. mr->ibmr.lkey = resp->lkey;
  87. mr->ibmr.rkey = resp->rkey;
  88. return &mr->ibmr;
  89. }
  90. /**
  91. * pvrdma_reg_user_mr - register a userspace memory region
  92. * @pd: protection domain
  93. * @start: starting address
  94. * @length: length of region
  95. * @virt_addr: I/O virtual address
  96. * @access_flags: access flags for memory region
  97. * @udata: user data
  98. *
  99. * @return: ib_mr pointer on success, otherwise returns an errno.
  100. */
  101. struct ib_mr *pvrdma_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
  102. u64 virt_addr, int access_flags,
  103. struct ib_udata *udata)
  104. {
  105. struct pvrdma_dev *dev = to_vdev(pd->device);
  106. struct pvrdma_user_mr *mr = NULL;
  107. struct ib_umem *umem;
  108. union pvrdma_cmd_req req;
  109. union pvrdma_cmd_resp rsp;
  110. struct pvrdma_cmd_create_mr *cmd = &req.create_mr;
  111. struct pvrdma_cmd_create_mr_resp *resp = &rsp.create_mr_resp;
  112. int ret;
  113. if (length == 0 || length > dev->dsr->caps.max_mr_size) {
  114. dev_warn(&dev->pdev->dev, "invalid mem region length\n");
  115. return ERR_PTR(-EINVAL);
  116. }
  117. umem = ib_umem_get(pd->uobject->context, start,
  118. length, access_flags, 0);
  119. if (IS_ERR(umem)) {
  120. dev_warn(&dev->pdev->dev,
  121. "could not get umem for mem region\n");
  122. return ERR_CAST(umem);
  123. }
  124. if (umem->npages < 0 || umem->npages > PVRDMA_PAGE_DIR_MAX_PAGES) {
  125. dev_warn(&dev->pdev->dev, "overflow %d pages in mem region\n",
  126. umem->npages);
  127. ret = -EINVAL;
  128. goto err_umem;
  129. }
  130. mr = kzalloc(sizeof(*mr), GFP_KERNEL);
  131. if (!mr) {
  132. ret = -ENOMEM;
  133. goto err_umem;
  134. }
  135. mr->mmr.iova = virt_addr;
  136. mr->mmr.size = length;
  137. mr->umem = umem;
  138. ret = pvrdma_page_dir_init(dev, &mr->pdir, umem->npages, false);
  139. if (ret) {
  140. dev_warn(&dev->pdev->dev,
  141. "could not allocate page directory\n");
  142. goto err_umem;
  143. }
  144. ret = pvrdma_page_dir_insert_umem(&mr->pdir, mr->umem, 0);
  145. if (ret)
  146. goto err_pdir;
  147. memset(cmd, 0, sizeof(*cmd));
  148. cmd->hdr.cmd = PVRDMA_CMD_CREATE_MR;
  149. cmd->start = start;
  150. cmd->length = length;
  151. cmd->pd_handle = to_vpd(pd)->pd_handle;
  152. cmd->access_flags = access_flags;
  153. cmd->nchunks = umem->npages;
  154. cmd->pdir_dma = mr->pdir.dir_dma;
  155. ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_MR_RESP);
  156. if (ret < 0) {
  157. dev_warn(&dev->pdev->dev,
  158. "could not register mem region, error: %d\n", ret);
  159. goto err_pdir;
  160. }
  161. mr->mmr.mr_handle = resp->mr_handle;
  162. mr->ibmr.lkey = resp->lkey;
  163. mr->ibmr.rkey = resp->rkey;
  164. return &mr->ibmr;
  165. err_pdir:
  166. pvrdma_page_dir_cleanup(dev, &mr->pdir);
  167. err_umem:
  168. ib_umem_release(umem);
  169. kfree(mr);
  170. return ERR_PTR(ret);
  171. }
  172. /**
  173. * pvrdma_alloc_mr - allocate a memory region
  174. * @pd: protection domain
  175. * @mr_type: type of memory region
  176. * @max_num_sg: maximum number of pages
  177. *
  178. * @return: ib_mr pointer on success, otherwise returns an errno.
  179. */
  180. struct ib_mr *pvrdma_alloc_mr(struct ib_pd *pd, enum ib_mr_type mr_type,
  181. u32 max_num_sg)
  182. {
  183. struct pvrdma_dev *dev = to_vdev(pd->device);
  184. struct pvrdma_user_mr *mr;
  185. union pvrdma_cmd_req req;
  186. union pvrdma_cmd_resp rsp;
  187. struct pvrdma_cmd_create_mr *cmd = &req.create_mr;
  188. struct pvrdma_cmd_create_mr_resp *resp = &rsp.create_mr_resp;
  189. int size = max_num_sg * sizeof(u64);
  190. int ret;
  191. if (mr_type != IB_MR_TYPE_MEM_REG ||
  192. max_num_sg > PVRDMA_MAX_FAST_REG_PAGES)
  193. return ERR_PTR(-EINVAL);
  194. mr = kzalloc(sizeof(*mr), GFP_KERNEL);
  195. if (!mr)
  196. return ERR_PTR(-ENOMEM);
  197. mr->pages = kzalloc(size, GFP_KERNEL);
  198. if (!mr->pages) {
  199. ret = -ENOMEM;
  200. goto freemr;
  201. }
  202. ret = pvrdma_page_dir_init(dev, &mr->pdir, max_num_sg, false);
  203. if (ret) {
  204. dev_warn(&dev->pdev->dev,
  205. "failed to allocate page dir for mr\n");
  206. ret = -ENOMEM;
  207. goto freepages;
  208. }
  209. memset(cmd, 0, sizeof(*cmd));
  210. cmd->hdr.cmd = PVRDMA_CMD_CREATE_MR;
  211. cmd->pd_handle = to_vpd(pd)->pd_handle;
  212. cmd->access_flags = 0;
  213. cmd->flags = PVRDMA_MR_FLAG_FRMR;
  214. cmd->nchunks = max_num_sg;
  215. ret = pvrdma_cmd_post(dev, &req, &rsp, PVRDMA_CMD_CREATE_MR_RESP);
  216. if (ret < 0) {
  217. dev_warn(&dev->pdev->dev,
  218. "could not create FR mem region, error: %d\n", ret);
  219. goto freepdir;
  220. }
  221. mr->max_pages = max_num_sg;
  222. mr->mmr.mr_handle = resp->mr_handle;
  223. mr->ibmr.lkey = resp->lkey;
  224. mr->ibmr.rkey = resp->rkey;
  225. mr->page_shift = PAGE_SHIFT;
  226. mr->umem = NULL;
  227. return &mr->ibmr;
  228. freepdir:
  229. pvrdma_page_dir_cleanup(dev, &mr->pdir);
  230. freepages:
  231. kfree(mr->pages);
  232. freemr:
  233. kfree(mr);
  234. return ERR_PTR(ret);
  235. }
  236. /**
  237. * pvrdma_dereg_mr - deregister a memory region
  238. * @ibmr: memory region
  239. *
  240. * @return: 0 on success.
  241. */
  242. int pvrdma_dereg_mr(struct ib_mr *ibmr)
  243. {
  244. struct pvrdma_user_mr *mr = to_vmr(ibmr);
  245. struct pvrdma_dev *dev = to_vdev(ibmr->device);
  246. union pvrdma_cmd_req req;
  247. struct pvrdma_cmd_destroy_mr *cmd = &req.destroy_mr;
  248. int ret;
  249. memset(cmd, 0, sizeof(*cmd));
  250. cmd->hdr.cmd = PVRDMA_CMD_DESTROY_MR;
  251. cmd->mr_handle = mr->mmr.mr_handle;
  252. ret = pvrdma_cmd_post(dev, &req, NULL, 0);
  253. if (ret < 0)
  254. dev_warn(&dev->pdev->dev,
  255. "could not deregister mem region, error: %d\n", ret);
  256. pvrdma_page_dir_cleanup(dev, &mr->pdir);
  257. if (mr->umem)
  258. ib_umem_release(mr->umem);
  259. kfree(mr->pages);
  260. kfree(mr);
  261. return 0;
  262. }
  263. static int pvrdma_set_page(struct ib_mr *ibmr, u64 addr)
  264. {
  265. struct pvrdma_user_mr *mr = to_vmr(ibmr);
  266. if (mr->npages == mr->max_pages)
  267. return -ENOMEM;
  268. mr->pages[mr->npages++] = addr;
  269. return 0;
  270. }
  271. int pvrdma_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sg, int sg_nents,
  272. unsigned int *sg_offset)
  273. {
  274. struct pvrdma_user_mr *mr = to_vmr(ibmr);
  275. struct pvrdma_dev *dev = to_vdev(ibmr->device);
  276. int ret;
  277. mr->npages = 0;
  278. ret = ib_sg_to_pages(ibmr, sg, sg_nents, sg_offset, pvrdma_set_page);
  279. if (ret < 0)
  280. dev_warn(&dev->pdev->dev, "could not map sg to pages\n");
  281. return ret;
  282. }