diff options
author | Christoph Hellwig <hch@lst.de> | 2015-11-26 09:08:36 +0100 |
---|---|---|
committer | Jens Axboe <axboe@fb.com> | 2015-12-01 10:59:38 -0700 |
commit | 21d34711e1b5970acfb22bddf1fefbfbd7e0123b (patch) | |
tree | 3b5c0d963a5a0f0bd5dc3382a9c1fb1e31ae9c0c /drivers/nvme/host/core.c | |
parent | 71bd150c71072014d98bff6dc2db3229306ece35 (diff) |
nvme: split command submission helpers out of pci.c
Create a new core.c and start by adding the command submission helpers
to it, which are already abstracted away from the actual hardware queues
by the block layer.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/nvme/host/core.c')
-rw-r--r-- | drivers/nvme/host/core.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c new file mode 100644 index 000000000000..ce938a428928 --- /dev/null +++ b/drivers/nvme/host/core.c @@ -0,0 +1,173 @@ +/* + * 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" + +/* + * 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, void __user *ubuffer, unsigned bufflen, + u32 *result, unsigned timeout) +{ + bool write = cmd->common.opcode & 1; + struct bio *bio = NULL; + struct request *req; + int ret; + + req = blk_mq_alloc_request(q, write, 0); + if (IS_ERR(req)) + return PTR_ERR(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->timeout = timeout ? timeout : ADMIN_TIMEOUT; + + req->cmd = (unsigned char *)cmd; + req->cmd_len = sizeof(struct nvme_command); + req->special = (void *)0; + + if (buffer && bufflen) { + ret = blk_rq_map_kern(q, req, buffer, bufflen, GFP_KERNEL); + if (ret) + goto out; + } else 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_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, + void *buffer, unsigned bufflen) +{ + return __nvme_submit_sync_cmd(q, cmd, buffer, NULL, bufflen, NULL, 0); +} + +int nvme_identify_ctrl(struct nvme_dev *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_dev *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_dev *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, NULL, 0, + result, 0); +} + +int nvme_set_features(struct nvme_dev *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, NULL, 0, + result, 0); +} + +int nvme_get_log_page(struct nvme_dev *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; +} |