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/*
* 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,
void __user *meta_buffer, unsigned meta_len, u32 meta_seed,
u32 *result, unsigned timeout)
{
bool write = cmd->common.opcode & 1;
struct nvme_ns *ns = q->queuedata;
struct gendisk *disk = ns ? ns->disk : NULL;
struct request *req;
struct bio *bio = NULL;
void *meta = NULL;
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;
if (!disk)
goto submit;
bio->bi_bdev = bdget_disk(disk, 0);
if (!bio->bi_bdev) {
ret = -ENODEV;
goto out_unmap;
}
if (meta_buffer) {
struct bio_integrity_payload *bip;
meta = kmalloc(meta_len, GFP_KERNEL);
if (!meta) {
ret = -ENOMEM;
goto out_unmap;
}
if (write) {
if (copy_from_user(meta, meta_buffer,
meta_len)) {
ret = -EFAULT;
goto out_free_meta;
}
}
bip = bio_integrity_alloc(bio, GFP_KERNEL, 1);
if (!bip) {
ret = -ENOMEM;
goto out_free_meta;
}
bip->bip_iter.bi_size = meta_len;
bip->bip_iter.bi_sector = meta_seed;
ret = bio_integrity_add_page(bio, virt_to_page(meta),
meta_len, offset_in_page(meta));
if (ret != meta_len) {
ret = -ENOMEM;
goto out_free_meta;
}
}
}
submit:
blk_execute_rq(req->q, disk, req, 0);
ret = req->errors;
if (result)
*result = (u32)(uintptr_t)req->special;
if (meta && !ret && !write) {
if (copy_to_user(meta_buffer, meta, meta_len))
ret = -EFAULT;
}
out_free_meta:
kfree(meta);
out_unmap:
if (bio) {
if (disk && bio->bi_bdev)
bdput(bio->bi_bdev);
blk_rq_unmap_user(bio);
}
out:
blk_mq_free_request(req);
return ret;
}
int nvme_submit_user_cmd(struct request_queue *q, struct nvme_command *cmd,
void __user *ubuffer, unsigned bufflen, u32 *result,
unsigned timeout)
{
return __nvme_submit_user_cmd(q, cmd, ubuffer, bufflen, NULL, 0, 0,
result, timeout);
}
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;
}
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