| /* |
| * NVM Express device driver |
| * Copyright (c) 2011-2014, Intel Corporation. |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms and conditions of the GNU General Public License, |
| * version 2, as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| */ |
| |
| #include <linux/blkdev.h> |
| #include <linux/blk-mq.h> |
| #include <linux/errno.h> |
| #include <linux/kernel.h> |
| #include <linux/slab.h> |
| #include <linux/types.h> |
| |
| #include "nvme.h" |
| |
| struct request *nvme_alloc_request(struct request_queue *q, |
| struct nvme_command *cmd, unsigned int flags) |
| { |
| bool write = cmd->common.opcode & 1; |
| struct request *req; |
| |
| req = blk_mq_alloc_request(q, write, flags); |
| if (IS_ERR(req)) |
| return req; |
| |
| req->cmd_type = REQ_TYPE_DRV_PRIV; |
| req->cmd_flags |= REQ_FAILFAST_DRIVER; |
| req->__data_len = 0; |
| req->__sector = (sector_t) -1; |
| req->bio = req->biotail = NULL; |
| |
| req->cmd = (unsigned char *)cmd; |
| req->cmd_len = sizeof(struct nvme_command); |
| req->special = (void *)0; |
| |
| return req; |
| } |
| |
| /* |
| * Returns 0 on success. If the result is negative, it's a Linux error code; |
| * if the result is positive, it's an NVM Express status code |
| */ |
| int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, |
| void *buffer, unsigned bufflen, u32 *result, unsigned timeout) |
| { |
| struct request *req; |
| int ret; |
| |
| req = nvme_alloc_request(q, cmd, 0); |
| if (IS_ERR(req)) |
| return PTR_ERR(req); |
| |
| req->timeout = timeout ? timeout : ADMIN_TIMEOUT; |
| |
| if (buffer && bufflen) { |
| ret = blk_rq_map_kern(q, req, buffer, bufflen, GFP_KERNEL); |
| if (ret) |
| goto out; |
| } |
| |
| blk_execute_rq(req->q, NULL, req, 0); |
| if (result) |
| *result = (u32)(uintptr_t)req->special; |
| ret = req->errors; |
| out: |
| blk_mq_free_request(req); |
| return ret; |
| } |
| |
| int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, |
| void *buffer, unsigned bufflen) |
| { |
| return __nvme_submit_sync_cmd(q, cmd, buffer, bufflen, NULL, 0); |
| } |
| |
| int nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd, |
| void __user *ubuffer, unsigned bufflen, u32 *result, |
| unsigned timeout) |
| { |
| struct bio *bio = NULL; |
| struct request *req; |
| int ret; |
| |
| req = nvme_alloc_request(q, cmd, 0); |
| if (IS_ERR(req)) |
| return PTR_ERR(req); |
| |
| req->timeout = timeout ? timeout : ADMIN_TIMEOUT; |
| |
| if (ubuffer && bufflen) { |
| ret = blk_rq_map_user(q, req, NULL, ubuffer, bufflen, |
| GFP_KERNEL); |
| if (ret) |
| goto out; |
| bio = req->bio; |
| } |
| |
| blk_execute_rq(req->q, NULL, req, 0); |
| if (bio) |
| blk_rq_unmap_user(bio); |
| if (result) |
| *result = (u32)(uintptr_t)req->special; |
| ret = req->errors; |
| out: |
| blk_mq_free_request(req); |
| return ret; |
| } |
| |
| int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id) |
| { |
| struct nvme_command c = { }; |
| int error; |
| |
| /* gcc-4.4.4 (at least) has issues with initializers and anon unions */ |
| c.identify.opcode = nvme_admin_identify; |
| c.identify.cns = cpu_to_le32(1); |
| |
| *id = kmalloc(sizeof(struct nvme_id_ctrl), GFP_KERNEL); |
| if (!*id) |
| return -ENOMEM; |
| |
| error = nvme_submit_sync_cmd(dev->admin_q, &c, *id, |
| sizeof(struct nvme_id_ctrl)); |
| if (error) |
| kfree(*id); |
| return error; |
| } |
| |
| int nvme_identify_ns(struct nvme_ctrl *dev, unsigned nsid, |
| struct nvme_id_ns **id) |
| { |
| struct nvme_command c = { }; |
| int error; |
| |
| /* gcc-4.4.4 (at least) has issues with initializers and anon unions */ |
| c.identify.opcode = nvme_admin_identify, |
| c.identify.nsid = cpu_to_le32(nsid), |
| |
| *id = kmalloc(sizeof(struct nvme_id_ns), GFP_KERNEL); |
| if (!*id) |
| return -ENOMEM; |
| |
| error = nvme_submit_sync_cmd(dev->admin_q, &c, *id, |
| sizeof(struct nvme_id_ns)); |
| if (error) |
| kfree(*id); |
| return error; |
| } |
| |
| int nvme_get_features(struct nvme_ctrl *dev, unsigned fid, unsigned nsid, |
| dma_addr_t dma_addr, u32 *result) |
| { |
| struct nvme_command c; |
| |
| memset(&c, 0, sizeof(c)); |
| c.features.opcode = nvme_admin_get_features; |
| c.features.nsid = cpu_to_le32(nsid); |
| c.features.prp1 = cpu_to_le64(dma_addr); |
| c.features.fid = cpu_to_le32(fid); |
| |
| return __nvme_submit_sync_cmd(dev->admin_q, &c, NULL, 0, result, 0); |
| } |
| |
| int nvme_set_features(struct nvme_ctrl *dev, unsigned fid, unsigned dword11, |
| dma_addr_t dma_addr, u32 *result) |
| { |
| struct nvme_command c; |
| |
| memset(&c, 0, sizeof(c)); |
| c.features.opcode = nvme_admin_set_features; |
| c.features.prp1 = cpu_to_le64(dma_addr); |
| c.features.fid = cpu_to_le32(fid); |
| c.features.dword11 = cpu_to_le32(dword11); |
| |
| return __nvme_submit_sync_cmd(dev->admin_q, &c, NULL, 0, result, 0); |
| } |
| |
| int nvme_get_log_page(struct nvme_ctrl *dev, struct nvme_smart_log **log) |
| { |
| struct nvme_command c = { }; |
| int error; |
| |
| c.common.opcode = nvme_admin_get_log_page, |
| c.common.nsid = cpu_to_le32(0xFFFFFFFF), |
| c.common.cdw10[0] = cpu_to_le32( |
| (((sizeof(struct nvme_smart_log) / 4) - 1) << 16) | |
| NVME_LOG_SMART), |
| |
| *log = kmalloc(sizeof(struct nvme_smart_log), GFP_KERNEL); |
| if (!*log) |
| return -ENOMEM; |
| |
| error = nvme_submit_sync_cmd(dev->admin_q, &c, *log, |
| sizeof(struct nvme_smart_log)); |
| if (error) |
| kfree(*log); |
| return error; |
| } |