diff options
| author | Bart Van Assche <bart.vanassche@wdc.com> | 2017-08-17 13:13:06 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2017-08-18 08:45:29 -0600 |
| commit | 6507f436f92c37a7963bf0d55df7b673d8d6f533 (patch) | |
| tree | b4e1001d3f89f967dab4544859b955f107ee1095 | |
| parent | fe4fd7235a0cfc7a98139068f6ce82ee3d813684 (diff) | |
| download | linux-rt-6507f436f92c37a7963bf0d55df7b673d8d6f533.tar.gz | |
skd: Simplify the code for allocating DMA message buffers
dma_alloc_coherent() guarantees alignment on a page boundary so
no explicit alignment is needed to align on a 64 byte boundary.
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | drivers/block/skd_main.c | 19 | ||||
| -rw-r--r-- | drivers/block/skd_s1120.h | 2 |
2 files changed, 7 insertions, 14 deletions
diff --git a/drivers/block/skd_main.c b/drivers/block/skd_main.c index 3fc6ec9477c7..37b900c97b87 100644 --- a/drivers/block/skd_main.c +++ b/drivers/block/skd_main.c @@ -190,7 +190,6 @@ struct skd_fitmsg_context { u16 outstanding; u32 length; - u32 offset; u8 *msg_buf; dma_addr_t mb_dma_address; @@ -2016,8 +2015,7 @@ static void skd_send_fitmsg(struct skd_device *skdev, dev_dbg(&skdev->pdev->dev, "dma address 0x%llx, busy=%d\n", skmsg->mb_dma_address, skdev->in_flight); - dev_dbg(&skdev->pdev->dev, "msg_buf 0x%p, offset %x\n", skmsg->msg_buf, - skmsg->offset); + dev_dbg(&skdev->pdev->dev, "msg_buf %p\n", skmsg->msg_buf); qcmd = skmsg->mb_dma_address; qcmd |= FIT_QCMD_QID_NORMAL; @@ -3854,7 +3852,7 @@ static int skd_cons_skmsg(struct skd_device *skdev) skmsg->state = SKD_MSG_STATE_IDLE; skmsg->msg_buf = pci_alloc_consistent(skdev->pdev, - SKD_N_FITMSG_BYTES + 64, + SKD_N_FITMSG_BYTES, &skmsg->mb_dma_address); if (skmsg->msg_buf == NULL) { @@ -3862,13 +3860,10 @@ static int skd_cons_skmsg(struct skd_device *skdev) goto err_out; } - skmsg->offset = (u32)((u64)skmsg->msg_buf & - (~FIT_QCMD_BASE_ADDRESS_MASK)); - skmsg->msg_buf += ~FIT_QCMD_BASE_ADDRESS_MASK; - skmsg->msg_buf = (u8 *)((u64)skmsg->msg_buf & - FIT_QCMD_BASE_ADDRESS_MASK); - skmsg->mb_dma_address += ~FIT_QCMD_BASE_ADDRESS_MASK; - skmsg->mb_dma_address &= FIT_QCMD_BASE_ADDRESS_MASK; + WARN(((uintptr_t)skmsg->msg_buf | skmsg->mb_dma_address) & + (FIT_QCMD_ALIGN - 1), + "not aligned: msg_buf %p mb_dma_address %#llx\n", + skmsg->msg_buf, skmsg->mb_dma_address); memset(skmsg->msg_buf, 0, SKD_N_FITMSG_BYTES); skmsg->next = &skmsg[1]; @@ -4230,8 +4225,6 @@ static void skd_free_skmsg(struct skd_device *skdev) skmsg = &skdev->skmsg_table[i]; if (skmsg->msg_buf != NULL) { - skmsg->msg_buf += skmsg->offset; - skmsg->mb_dma_address += skmsg->offset; pci_free_consistent(skdev->pdev, SKD_N_FITMSG_BYTES, skmsg->msg_buf, skmsg->mb_dma_address); diff --git a/drivers/block/skd_s1120.h b/drivers/block/skd_s1120.h index f69d3d97744d..8044705cbbf9 100644 --- a/drivers/block/skd_s1120.h +++ b/drivers/block/skd_s1120.h @@ -28,7 +28,7 @@ #define FIT_QCMD_MSGSIZE_128 (0x1 << 4) #define FIT_QCMD_MSGSIZE_256 (0x2 << 4) #define FIT_QCMD_MSGSIZE_512 (0x3 << 4) -#define FIT_QCMD_BASE_ADDRESS_MASK (0xFFFFFFFFFFFFFFC0ull) +#define FIT_QCMD_ALIGN L1_CACHE_BYTES /* * Control, 32-bit r/w |