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Revert "mtip32xx: use runtime tag to initialize command header"

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This reverts commit 9bf9e352ed which was
commit a4e84aae8139aca9fbfbced1f45c51ca81b57488 upstream.

Ben writes:
	MQ IO schedulers were introduced in 4.11, so this shouldn't be
	needed in older branches.  It also causes a performance
	regression (fixed upstream).  Please revert this for 4.4 and
	4.9.

So let's revert it!

Reported-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Jens Axboe <axboe@fb.com>
Cc: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman 2018-04-06 09:27:10 +02:00
parent b13864b2fd
commit 16b5fdd9c6
1 changed files with 12 additions and 24 deletions
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36
drivers/block/mtip32xx/mtip32xx.c
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@ -169,25 +169,6 @@ static bool mtip_check_surprise_removal(struct pci_dev *pdev)
return false; /* device present */
}
/* we have to use runtime tag to setup command header */
static void mtip_init_cmd_header(struct request *rq)
{
struct driver_data *dd = rq->q->queuedata;
struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
u32 host_cap_64 = readl(dd->mmio + HOST_CAP) & HOST_CAP_64;
/* Point the command headers at the command tables. */
cmd->command_header = dd->port->command_list +
(sizeof(struct mtip_cmd_hdr) * rq->tag);
cmd->command_header_dma = dd->port->command_list_dma +
(sizeof(struct mtip_cmd_hdr) * rq->tag);
if (host_cap_64)
cmd->command_header->ctbau = __force_bit2int cpu_to_le32((cmd->command_dma >> 16) >> 16);
cmd->command_header->ctba = __force_bit2int cpu_to_le32(cmd->command_dma & 0xFFFFFFFF);
}
static struct mtip_cmd *mtip_get_int_command(struct driver_data *dd)
{
struct request *rq;
@ -199,9 +180,6 @@ static struct mtip_cmd *mtip_get_int_command(struct driver_data *dd)
if (IS_ERR(rq))
return NULL;
/* Internal cmd isn't submitted via .queue_rq */
mtip_init_cmd_header(rq);
return blk_mq_rq_to_pdu(rq);
}
@ -3840,8 +3818,6 @@ static int mtip_queue_rq(struct blk_mq_hw_ctx *hctx,
struct request *rq = bd->rq;
int ret;
mtip_init_cmd_header(rq);
if (unlikely(mtip_check_unal_depth(hctx, rq)))
return BLK_MQ_RQ_QUEUE_BUSY;
@ -3873,6 +3849,7 @@ static int mtip_init_cmd(void *data, struct request *rq, unsigned int hctx_idx,
{
struct driver_data *dd = data;
struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
u32 host_cap_64 = readl(dd->mmio + HOST_CAP) & HOST_CAP_64;
/*
* For flush requests, request_idx starts at the end of the
@ -3889,6 +3866,17 @@ static int mtip_init_cmd(void *data, struct request *rq, unsigned int hctx_idx,
memset(cmd->command, 0, CMD_DMA_ALLOC_SZ);
/* Point the command headers at the command tables. */
cmd->command_header = dd->port->command_list +
(sizeof(struct mtip_cmd_hdr) * request_idx);
cmd->command_header_dma = dd->port->command_list_dma +
(sizeof(struct mtip_cmd_hdr) * request_idx);
if (host_cap_64)
cmd->command_header->ctbau = __force_bit2int cpu_to_le32((cmd->command_dma >> 16) >> 16);
cmd->command_header->ctba = __force_bit2int cpu_to_le32(cmd->command_dma & 0xFFFFFFFF);
sg_init_table(cmd->sg, MTIP_MAX_SG);
return 0;
}