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Date: Wed, 20 May 2015 13:54:25 -0400
From: Parav Pandit <parav.pandit@...gotech.com>
To: linux-nvme@...ts.infradead.org, willy@...ux.intel.com
Cc: parav.pandit@...gotech.com, axboe@...nel.dk,
linux-kernel@...r.kernel.org
Subject: [PATCH] NVMe: General code cleanup for reuse.
Moved code for reusing at few places:
1. Moved lba_shift related calculation code to macro for converting block to/from len.
2. Moved req_len to nlb calculation to inline function.
Signed-off-by: Parav Pandit <parav.pandit@...gotech.com>
---
drivers/block/nvme-core.c | 10 +++++-----
drivers/block/nvme-scsi.c | 10 +++++-----
include/linux/nvme.h | 8 ++++++++
3 files changed, 18 insertions(+), 10 deletions(-)
diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c
index 85b8036..b9ba36f 100644
--- a/drivers/block/nvme-core.c
+++ b/drivers/block/nvme-core.c
@@ -521,7 +521,7 @@ static void nvme_dif_remap(struct request *req,
p = pmap;
virt = bip_get_seed(bip);
phys = nvme_block_nr(ns, blk_rq_pos(req));
- nlb = (blk_rq_bytes(req) >> ns->lba_shift);
+ nlb = nvme_req_len_to_nlb(ns, req);
ts = ns->disk->integrity->tuple_size;
for (i = 0; i < nlb; i++, virt++, phys++) {
@@ -722,7 +722,7 @@ static void nvme_submit_discard(struct nvme_queue *nvmeq, struct nvme_ns *ns,
struct nvme_command *cmnd = &nvmeq->sq_cmds[nvmeq->sq_tail];
range->cattr = cpu_to_le32(0);
- range->nlb = cpu_to_le32(blk_rq_bytes(req) >> ns->lba_shift);
+ range->nlb = cpu_to_le32(nvme_req_len_to_nlb(ns, req));
range->slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
memset(cmnd, 0, sizeof(*cmnd));
@@ -778,7 +778,7 @@ static int nvme_submit_iod(struct nvme_queue *nvmeq, struct nvme_iod *iod,
cmnd->rw.prp1 = cpu_to_le64(sg_dma_address(iod->sg));
cmnd->rw.prp2 = cpu_to_le64(iod->first_dma);
cmnd->rw.slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req)));
- cmnd->rw.length = cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1);
+ cmnd->rw.length = cpu_to_le16(nvme_req_len_to_nlb(ns, req) - 1);
if (blk_integrity_rq(req)) {
cmnd->rw.metadata = cpu_to_le64(sg_dma_address(iod->meta_sg));
@@ -1753,7 +1753,7 @@ static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
if (copy_from_user(&io, uio, sizeof(io)))
return -EFAULT;
- length = (io.nblocks + 1) << ns->lba_shift;
+ length = NVME_BLOCKS_TO_LEN(ns, io.nblocks + 1);
meta_len = (io.nblocks + 1) * ns->ms;
if (meta_len && ((io.metadata & 3) || !io.metadata) && !ns->ext)
@@ -2127,7 +2127,7 @@ static void nvme_alloc_ns(struct nvme_dev *dev, unsigned nsid)
ns->lba_shift = 9; /* set to a default value for 512 until disk is validated */
list_add_tail(&ns->list, &dev->namespaces);
- blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift);
+ blk_queue_logical_block_size(ns->queue, NVME_BLOCKS_TO_LEN(ns, 1));
if (dev->max_hw_sectors)
blk_queue_max_hw_sectors(ns->queue, dev->max_hw_sectors);
if (dev->stripe_size)
diff --git a/drivers/block/nvme-scsi.c b/drivers/block/nvme-scsi.c
index 6b736b0..b7b78d0 100644
--- a/drivers/block/nvme-scsi.c
+++ b/drivers/block/nvme-scsi.c
@@ -2101,14 +2101,14 @@ static int nvme_trans_do_nvme_io(struct nvme_ns *ns, struct sg_io_hdr *hdr,
if (retcode)
return -EFAULT;
unit_len = sgl.iov_len;
- unit_num_blocks = unit_len >> ns->lba_shift;
+ unit_num_blocks = NVME_LEN_TO_BLOCKS(ns, unit_len);
next_mapping_addr = sgl.iov_base;
} else {
unit_num_blocks = min((u64)max_blocks,
(cdb_info->xfer_len - nvme_offset));
- unit_len = unit_num_blocks << ns->lba_shift;
+ unit_len = NVME_BLOCKS_TO_LEN(ns, unit_num_blocks);
next_mapping_addr = hdr->dxferp +
- ((1 << ns->lba_shift) * nvme_offset);
+ ((NVME_BLOCKS_TO_LEN(ns, 1)) * nvme_offset);
}
c.rw.opcode = opcode;
@@ -2208,7 +2208,7 @@ static int nvme_trans_io(struct nvme_ns *ns, struct sg_io_hdr *hdr, u8 is_write,
return -EFAULT;
sum_iov_len += sgl.iov_len;
/* IO vector sizes should be multiples of block size */
- if (sgl.iov_len % (1 << ns->lba_shift) != 0) {
+ if (sgl.iov_len % (NVME_BLOCKS_TO_LEN(ns, 1)) != 0) {
res = nvme_trans_completion(hdr,
SAM_STAT_CHECK_CONDITION,
ILLEGAL_REQUEST,
@@ -2225,7 +2225,7 @@ static int nvme_trans_io(struct nvme_ns *ns, struct sg_io_hdr *hdr, u8 is_write,
xfer_bytes = min(((u64)hdr->dxfer_len), sum_iov_len);
/* If block count and actual data buffer size dont match, error out */
- if (xfer_bytes != (cdb_info.xfer_len << ns->lba_shift)) {
+ if (xfer_bytes != NVME_BLOCKS_TO_LEN(ns, cdb_info.xfer_len)) {
res = -EINVAL;
goto out;
}
diff --git a/include/linux/nvme.h b/include/linux/nvme.h
index 8dbd05e..71f7984 100644
--- a/include/linux/nvme.h
+++ b/include/linux/nvme.h
@@ -124,6 +124,9 @@ struct nvme_ns {
u32 mode_select_block_len;
};
+#define NVME_BLOCKS_TO_LEN(ns, num_blocks) ((num_blocks) << ns->lba_shift)
+#define NVME_LEN_TO_BLOCKS(ns, len) ((len) >> ns->lba_shift)
+
/*
* The nvme_iod describes the data in an I/O, including the list of PRP
* entries. You can't see it in this data structure because C doesn't let
@@ -146,6 +149,11 @@ static inline u64 nvme_block_nr(struct nvme_ns *ns, sector_t sector)
return (sector >> (ns->lba_shift - 9));
}
+static inline u32 nvme_req_len_to_nlb(struct nvme_ns *ns, struct request *req)
+{
+ return (blk_rq_bytes(req) >> ns->lba_shift);
+}
+
/**
* nvme_free_iod - frees an nvme_iod
* @dev: The device that the I/O was submitted to
--
1.8.3.1
--
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