drivers/nvme/host/core.c

   1 /*
   2  * NVM Express device driver
   3  * Copyright (c) 2011-2014, Intel Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  */
  14
  15 #include <linux/blkdev.h>
  16 #include <linux/blk-mq.h>
  17 #include <linux/errno.h>
  18 #include <linux/kernel.h>
  19 #include <linux/slab.h>
  20 #include <linux/types.h>
  21
  22 #include "nvme.h"
  23
  24 /*
  25  * Returns 0 on success.  If the result is negative, it's a Linux error code;
  26  * if the result is positive, it's an NVM Express status code
  27  */
  28 int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
  29                 void *buffer, void __user *ubuffer, unsigned bufflen,
  30                 u32 *result, unsigned timeout)
  31 {
  32         bool write = cmd->common.opcode & 1;
  33         struct bio *bio = NULL;
  34         struct request *req;
  35         int ret;
  36
  37         req = blk_mq_alloc_request(q, write, 0);
  38         if (IS_ERR(req))
  39                 return PTR_ERR(req);
  40
  41         req->cmd_type = REQ_TYPE_DRV_PRIV;
  42         req->cmd_flags |= REQ_FAILFAST_DRIVER;
  43         req->__data_len = 0;
  44         req->__sector = (sector_t) -1;
  45         req->bio = req->biotail = NULL;
  46
  47         req->timeout = timeout ? timeout : ADMIN_TIMEOUT;
  48
  49         req->cmd = (unsigned char *)cmd;
  50         req->cmd_len = sizeof(struct nvme_command);
  51         req->special = (void *)0;
  52
  53         if (buffer && bufflen) {
  54                 ret = blk_rq_map_kern(q, req, buffer, bufflen, GFP_KERNEL);
  55                 if (ret)
  56                         goto out;
  57         } else if (ubuffer && bufflen) {
  58                 ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen,
  59                                 GFP_KERNEL);
  60                 if (ret)
  61                         goto out;
  62                 bio = req->bio;
  63         }
  64
  65         blk_execute_rq(req->q, NULL, req, 0);
  66         if (bio)
  67                 blk_rq_unmap_user(bio);
  68         if (result)
  69                 *result = (u32)(uintptr_t)req->special;
  70         ret = req->errors;
  71  out:
  72         blk_mq_free_request(req);
  73         return ret;
  74 }
  75
  76 int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd,
  77                 void *buffer, unsigned bufflen)
  78 {
  79         return __nvme_submit_sync_cmd(q, cmd, buffer, NULL, bufflen, NULL, 0);
  80 }
  81
  82 int nvme_identify_ctrl(struct nvme_dev *dev, struct nvme_id_ctrl **id)
  83 {
  84         struct nvme_command c = { };
  85         int error;
  86
  87         /* gcc-4.4.4 (at least) has issues with initializers and anon unions */
  88         c.identify.opcode = nvme_admin_identify;
  89         c.identify.cns = cpu_to_le32(1);
  90
  91         *id = kmalloc(sizeof(struct nvme_id_ctrl), GFP_KERNEL);
  92         if (!*id)
  93                 return -ENOMEM;
  94
  95         error = nvme_submit_sync_cmd(dev->admin_q, &c, *id,
  96                         sizeof(struct nvme_id_ctrl));
  97         if (error)
  98                 kfree(*id);
  99         return error;
 100 }
 101
 102 int nvme_identify_ns(struct nvme_dev *dev, unsigned nsid,
 103                 struct nvme_id_ns **id)
 104 {
 105         struct nvme_command c = { };
 106         int error;
 107
 108         /* gcc-4.4.4 (at least) has issues with initializers and anon unions */
 109         c.identify.opcode = nvme_admin_identify,
 110         c.identify.nsid = cpu_to_le32(nsid),
 111
 112         *id = kmalloc(sizeof(struct nvme_id_ns), GFP_KERNEL);
 113         if (!*id)
 114                 return -ENOMEM;
 115
 116         error = nvme_submit_sync_cmd(dev->admin_q, &c, *id,
 117                         sizeof(struct nvme_id_ns));
 118         if (error)
 119                 kfree(*id);
 120         return error;
 121 }
 122
 123 int nvme_get_features(struct nvme_dev *dev, unsigned fid, unsigned nsid,
 124                                         dma_addr_t dma_addr, u32 *result)
 125 {
 126         struct nvme_command c;
 127
 128         memset(&c, 0, sizeof(c));
 129         c.features.opcode = nvme_admin_get_features;
 130         c.features.nsid = cpu_to_le32(nsid);
 131         c.features.prp1 = cpu_to_le64(dma_addr);
 132         c.features.fid = cpu_to_le32(fid);
 133
 134         return __nvme_submit_sync_cmd(dev->admin_q, &c, NULL, NULL, 0,
 135                         result, 0);
 136 }
 137
 138 int nvme_set_features(struct nvme_dev *dev, unsigned fid, unsigned dword11,
 139                                         dma_addr_t dma_addr, u32 *result)
 140 {
 141         struct nvme_command c;
 142
 143         memset(&c, 0, sizeof(c));
 144         c.features.opcode = nvme_admin_set_features;
 145         c.features.prp1 = cpu_to_le64(dma_addr);
 146         c.features.fid = cpu_to_le32(fid);
 147         c.features.dword11 = cpu_to_le32(dword11);
 148
 149         return __nvme_submit_sync_cmd(dev->admin_q, &c, NULL, NULL, 0,
 150                         result, 0);
 151 }
 152
 153 int nvme_get_log_page(struct nvme_dev *dev, struct nvme_smart_log **log)
 154 {
 155         struct nvme_command c = { };
 156         int error;
 157
 158         c.common.opcode = nvme_admin_get_log_page,
 159         c.common.nsid = cpu_to_le32(0xFFFFFFFF),
 160         c.common.cdw10[0] = cpu_to_le32(
 161                         (((sizeof(struct nvme_smart_log) / 4) - 1) << 16) |
 162                          NVME_LOG_SMART),
 163
 164         *log = kmalloc(sizeof(struct nvme_smart_log), GFP_KERNEL);
 165         if (!*log)
 166                 return -ENOMEM;
 167
 168         error = nvme_submit_sync_cmd(dev->admin_q, &c, *log,
 169                         sizeof(struct nvme_smart_log));
 170         if (error)
 171                 kfree(*log);
 172         return error;
 173 }