1cd1db2b45
Since there is no kernel-kernel api available to communicate with nvme driver it is more convenient to use some nvme-dedicated software (e.g. nvme-cli) to manage nvme devices. It is even not possible to format nvme device with CAS using current implementation on newest kernels. Signed-off-by: Michal Rakowski <michal.rakowski@intel.com> Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
/*
|
|
* Copyright(c) 2012-2020 Intel Corporation
|
|
* SPDX-License-Identifier: BSD-3-Clause-Clear
|
|
*/
|
|
|
|
#include "cas_cache.h"
|
|
#include "utils_nvme.h"
|
|
#include "utils_blk.h"
|
|
|
|
#include <linux/ioctl.h>
|
|
#include <linux/file.h>
|
|
|
|
|
|
int cas_nvme_get_nsid(struct block_device *bdev, unsigned int *nsid)
|
|
{
|
|
int ret = 0;
|
|
|
|
/*
|
|
* Maximum NSID is 0xFFFFFFFF, so theoretically there is no free
|
|
* room for error code. However it's unlikely that there will ever
|
|
* be device with such number of namespaces, so we treat this value
|
|
* as it was signed. Then in case of negative value we interpret it
|
|
* as an error code. Moreover in case of error we can be sure, that
|
|
* we deal with non-NVMe device, because this ioctl should never
|
|
* fail with NVMe driver.
|
|
*/
|
|
ret = ioctl_by_bdev(bdev, NVME_IOCTL_ID, (unsigned long)NULL);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
*nsid = (unsigned int)ret;
|
|
return 0;
|
|
}
|
|
|
|
#define NVME_ID_CNS_NS 0x00
|
|
#define NVME_ID_CNS_CTRL 0x01
|
|
|
|
int cas_nvme_identify_ns(struct block_device *bdev, unsigned int nsid,
|
|
struct nvme_id_ns *ns)
|
|
{
|
|
struct nvme_admin_cmd cmd = { };
|
|
unsigned long __user buffer;
|
|
int ret = 0;
|
|
|
|
buffer = cas_vm_mmap(NULL, 0, sizeof(*ns));
|
|
if (IS_ERR((void *)buffer))
|
|
return PTR_ERR((void *)buffer);
|
|
|
|
cmd.opcode = nvme_admin_identify;
|
|
cmd.nsid = cpu_to_le32(nsid);
|
|
cmd.addr = (__u64)buffer;
|
|
cmd.data_len = sizeof(*ns);
|
|
cmd.cdw10 = NVME_ID_CNS_NS;
|
|
ret = ioctl_by_bdev(bdev, NVME_IOCTL_ADMIN_CMD, (unsigned long)&cmd);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = copy_from_user(ns, (void *)buffer, sizeof(*ns));
|
|
if (ret > 0)
|
|
ret = -EINVAL;
|
|
out:
|
|
cas_vm_munmap(buffer, sizeof(*ns));
|
|
return ret;
|
|
}
|