xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

nvme: use the block layer for userspace passthrough metadata

Browse Source 
Use the integrity API to pass through metadata from userspace.  For PI
enabled devices this means that we now validate the reftag, which seems
like an unintentional ommission in the old code.

Thanks to Keith Busch for testing and fixes.

Signed-off-by: Christoph Hellwig <hch@lst.de>
[Skip metadata setup on admin commands]
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Keith Busch
2015-10-23 09:47:28 -06:00
committed by Jens Axboe
parent 4160982e75
commit 0b7f1f26f9
3 changed files with 83 additions and 43 deletions
Download Patch File Download Diff File Expand all files Collapse all files

39
drivers/nvme/host/pci.c
View File

@@ -1635,13 +1635,9 @@ static int nvme_configure_admin_queue(struct nvme_dev *dev)
static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
{
struct nvme_dev *dev = to_nvme_dev(ns->ctrl);
struct nvme_user_io io;
struct nvme_command c;
unsigned length, meta_len;
int status, write;
dma_addr_t meta_dma = 0;
void *meta = NULL;
void __user *metadata;
if (copy_from_user(&io, uio, sizeof(io)))
@@ -1659,29 +1655,13 @@ static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
length = (io.nblocks + 1) << ns->lba_shift;
meta_len = (io.nblocks + 1) * ns->ms;
metadata = (void __user *)(uintptr_t)io.metadata;
write = io.opcode & 1;
if (ns->ext) {
length += meta_len;
meta_len = 0;
}
if (meta_len) {
if (((io.metadata & 3) || !io.metadata) && !ns->ext)
} else if (meta_len) {
if ((io.metadata & 3) || !io.metadata)
return -EINVAL;
meta = dma_alloc_coherent(dev->dev, meta_len,
&meta_dma, GFP_KERNEL);
if (!meta) {
status = -ENOMEM;
goto unmap;
}
if (write) {
if (copy_from_user(meta, metadata, meta_len)) {
status = -EFAULT;
goto unmap;
}
}
}
memset(&c, 0, sizeof(c));
@@ -1695,19 +1675,10 @@ static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
c.rw.reftag = cpu_to_le32(io.reftag);
c.rw.apptag = cpu_to_le16(io.apptag);
c.rw.appmask = cpu_to_le16(io.appmask);
c.rw.metadata = cpu_to_le64(meta_dma);
status = nvme_submit_user_cmd(ns->queue, &c,
(void __user *)(uintptr_t)io.addr, length, NULL, 0);
unmap:
if (meta) {
if (status == NVME_SC_SUCCESS && !write) {
if (copy_to_user(metadata, meta, meta_len))
status = -EFAULT;
}
dma_free_coherent(dev->dev, meta_len, meta, meta_dma);
}
return status;
return __nvme_submit_user_cmd(ns->queue, &c,
(void __user *)(uintptr_t)io.addr, length,
metadata, meta_len, io.slba, NULL, 0);
}
static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,