From: Bart Van Assche <bart.vanassche@wdc.com>
Date: Thu, 17 Aug 2017 13:13:06 -0700
Subject: [PATCH] skd: Simplify the code for allocating DMA message buffers
Git-commit: 6507f436f92c37a7963bf0d55df7b673d8d6f533
Patch-mainline: v4.14-rc1
References: bsc#1104967,FATE#325924
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>
Acked-by: Hannes Reinecke <hare@suse.com>
---
drivers/block/skd_main.c | 19 ++++++-------------
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
--
2.16.4