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scsi: core: Add a dma_alignment field to the host and host template

Browse Source 
Get drivers out of the business of having to call the block layer DMA
alignment limits helpers themselves.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20240409143748.980206-8-hch@lst.de
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: John Garry <john.g.garry@oracle.com>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Christoph Hellwig 2024-04-09 16:37:32 +02:00 committed by Martin K. Petersen
parent 6248d7f771
commit 5b7dfbeff9
14 changed files with 42 additions and 53 deletions
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6
drivers/firewire/sbp2.c
View File

@ -1500,12 +1500,6 @@ static int sbp2_scsi_slave_alloc(struct scsi_device *sdev)
sdev->allow_restart = 1;
/*
* SBP-2 does not require any alignment, but we set it anyway
* for compatibility with earlier versions of this driver.
*/
blk_queue_update_dma_alignment(sdev->request_queue, 4 - 1);
if (lu->tgt->workarounds & SBP2_WORKAROUND_INQUIRY_36)
sdev->inquiry_len = 36;

1
drivers/message/fusion/mptfc.c
View File

@ -129,6 +129,7 @@ static const struct scsi_host_template mptfc_driver_template = {
.sg_tablesize = MPT_SCSI_SG_DEPTH,
.max_sectors = 8192,
.cmd_per_lun = 7,
.dma_alignment = 511,
.shost_groups = mptscsih_host_attr_groups,
};

1
drivers/message/fusion/mptsas.c
View File

@ -2020,6 +2020,7 @@ static const struct scsi_host_template mptsas_driver_template = {
.sg_tablesize = MPT_SCSI_SG_DEPTH,
.max_sectors = 8192,
.cmd_per_lun = 7,
.dma_alignment = 511,
.shost_groups = mptscsih_host_attr_groups,
.no_write_same = 1,
};

2
drivers/message/fusion/mptscsih.c
View File

@ -2438,8 +2438,6 @@ mptscsih_slave_configure(struct scsi_device *sdev)
"tagged %d, simple %d\n",
ioc->name,sdev->tagged_supported, sdev->simple_tags));
blk_queue_dma_alignment (sdev->request_queue, 512 - 1);
return 0;
}

1
drivers/message/fusion/mptspi.c
View File

@ -843,6 +843,7 @@ static const struct scsi_host_template mptspi_driver_template = {
.sg_tablesize = MPT_SCSI_SG_DEPTH,
.max_sectors = 8192,
.cmd_per_lun = 7,
.dma_alignment = 511,
.shost_groups = mptscsih_host_attr_groups,
};

6
drivers/scsi/hosts.c
View File

@ -478,6 +478,12 @@ struct Scsi_Host *scsi_host_alloc(const struct scsi_host_template *sht, int priv
else
shost->max_segment_size = BLK_MAX_SEGMENT_SIZE;
/* 32-byte (dword) is a common minimum for HBAs. */
if (sht->dma_alignment)
shost->dma_alignment = sht->dma_alignment;
else
shost->dma_alignment = 3;
/*
* assume a 4GB boundary, if not set
*/

2
drivers/scsi/iscsi_tcp.c
View File

@ -943,6 +943,7 @@ iscsi_sw_tcp_session_create(struct iscsi_endpoint *ep, uint16_t cmds_max,
shost->max_id = 0;
shost->max_channel = 0;
shost->max_cmd_len = SCSI_MAX_VARLEN_CDB_SIZE;
shost->dma_alignment = 0;
rc = iscsi_host_get_max_scsi_cmds(shost, cmds_max);
if (rc < 0)
@ -1065,7 +1066,6 @@ static int iscsi_sw_tcp_slave_configure(struct scsi_device *sdev)
if (conn->datadgst_en)
blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES,
sdev->request_queue);
blk_queue_dma_alignment(sdev->request_queue, 0);
return 0;
}

6
drivers/scsi/qla2xxx/qla_os.c
View File

@ -1957,9 +1957,6 @@ qla2xxx_slave_configure(struct scsi_device *sdev)
scsi_qla_host_t *vha = shost_priv(sdev->host);
struct req_que *req = vha->req;
if (IS_T10_PI_CAPABLE(vha->hw))
blk_queue_update_dma_alignment(sdev->request_queue, 0x7);
scsi_change_queue_depth(sdev, req->max_q_depth);
return 0;
}
@ -3575,6 +3572,9 @@ skip_dpc:
QLA_SG_ALL : 128;
}
if (IS_T10_PI_CAPABLE(base_vha->hw))
host->dma_alignment = 0x7;
ret = scsi_add_host(host, &pdev->dev);
if (ret)
goto probe_failed;

11
drivers/scsi/scsi_lib.c
View File

@ -1985,15 +1985,8 @@ void scsi_init_limits(struct Scsi_Host *shost, struct queue_limits *lim)
lim->seg_boundary_mask = shost->dma_boundary;
lim->max_segment_size = shost->max_segment_size;
lim->virt_boundary_mask = shost->virt_boundary_mask;
/*
* Set a reasonable default alignment: The larger of 32-byte (dword),
* which is a common minimum for HBAs, and the minimum DMA alignment,
* which is set by the platform.
*
* Devices that require a bigger alignment can increase it later.
*/
lim->dma_alignment = max(4, dma_get_cache_alignment()) - 1;
lim->dma_alignment = max_t(unsigned int,
shost->dma_alignment, dma_get_cache_alignment() - 1);
if (shost->no_highmem)
lim->bounce = BLK_BOUNCE_HIGH;

24
drivers/staging/rts5208/rtsx.c
View File

@ -70,18 +70,6 @@ static int slave_alloc(struct scsi_device *sdev)
static int slave_configure(struct scsi_device *sdev)
{
/*
* Scatter-gather buffers (all but the last) must have a length
* divisible by the bulk maxpacket size. Otherwise a data packet
* would end up being short, causing a premature end to the data
* transfer. Since high-speed bulk pipes have a maxpacket size
* of 512, we'll use that as the scsi device queue's DMA alignment
* mask. Guaranteeing proper alignment of the first buffer will
* have the desired effect because, except at the beginning and
* the end, scatter-gather buffers follow page boundaries.
*/
blk_queue_dma_alignment(sdev->request_queue, (512 - 1));
/* Set the SCSI level to at least 2. We'll leave it at 3 if that's
* what is originally reported. We need this to avoid confusing
* the SCSI layer with devices that report 0 or 1, but need 10-byte
@ -219,6 +207,18 @@ static const struct scsi_host_template rtsx_host_template = {
/* limit the total size of a transfer to 120 KB */
.max_sectors = 240,
/*
* Scatter-gather buffers (all but the last) must have a length
* divisible by the bulk maxpacket size. Otherwise a data packet
* would end up being short, causing a premature end to the data
* transfer. Since high-speed bulk pipes have a maxpacket size
* of 512, we'll use that as the scsi device queue's DMA alignment
* mask. Guaranteeing proper alignment of the first buffer will
* have the desired effect because, except at the beginning and
* the end, scatter-gather buffers follow page boundaries.
*/
.dma_alignment = 511,
/* emulated HBA */
.emulated = 1,

8
drivers/usb/image/microtek.c
View File

@ -328,12 +328,6 @@ static int mts_slave_alloc (struct scsi_device *s)
return 0;
}
static int mts_slave_configure (struct scsi_device *s)
{
blk_queue_dma_alignment(s->request_queue, (512 - 1));
return 0;
}
static int mts_scsi_abort(struct scsi_cmnd *srb)
{
struct mts_desc* desc = (struct mts_desc*)(srb->device->host->hostdata[0]);
@ -631,8 +625,8 @@ static const struct scsi_host_template mts_scsi_host_template = {
.can_queue = 1,
.this_id = -1,
.emulated = 1,
.dma_alignment = 511,
.slave_alloc = mts_slave_alloc,
.slave_configure = mts_slave_configure,
.max_sectors= 256, /* 128 K */
};

11
drivers/usb/storage/scsiglue.c
View File

@ -75,12 +75,6 @@ static int slave_alloc (struct scsi_device *sdev)
*/
sdev->inquiry_len = 36;
/*
* Some host controllers may have alignment requirements.
* We'll play it safe by requiring 512-byte alignment always.
*/
blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1));
/* Tell the SCSI layer if we know there is more than one LUN */
if (us->protocol == USB_PR_BULK && us->max_lun > 0)
sdev->sdev_bflags |= BLIST_FORCELUN;
@ -638,6 +632,11 @@ static const struct scsi_host_template usb_stor_host_template = {
/* lots of sg segments can be handled */
.sg_tablesize = SG_MAX_SEGMENTS,
/*
* Some host controllers may have alignment requirements.
* We'll play it safe by requiring 512-byte alignment always.
*/
.dma_alignment = 511,
/*
* Limit the total size of a transfer to 120 KB.

13
drivers/usb/storage/uas.c
View File

@ -824,13 +824,6 @@ static int uas_slave_alloc(struct scsi_device *sdev)
sdev->hostdata = devinfo;
/*
* The protocol has no requirements on alignment in the strict sense.
* Controllers may or may not have alignment restrictions.
* As this is not exported, we use an extremely conservative guess.
*/
blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1));
if (devinfo->flags & US_FL_MAX_SECTORS_64)
blk_queue_max_hw_sectors(sdev->request_queue, 64);
else if (devinfo->flags & US_FL_MAX_SECTORS_240)
@ -912,6 +905,12 @@ static const struct scsi_host_template uas_host_template = {
.eh_device_reset_handler = uas_eh_device_reset_handler,
.this_id = -1,
.skip_settle_delay = 1,
/*
* The protocol has no requirements on alignment in the strict sense.
* Controllers may or may not have alignment restrictions.
* As this is not exported, we use an extremely conservative guess.
*/
.dma_alignment = 511,
.dma_boundary = PAGE_SIZE - 1,
.cmd_size = sizeof(struct uas_cmd_info),
};

3
include/scsi/scsi_host.h
View File

@ -405,6 +405,8 @@ struct scsi_host_template {
*/
unsigned int max_segment_size;
unsigned int dma_alignment;
/*
* DMA scatter gather segment boundary limit. A segment crossing this
* boundary will be split in two.
@ -614,6 +616,7 @@ struct Scsi_Host {
unsigned int max_sectors;
unsigned int opt_sectors;
unsigned int max_segment_size;
unsigned int dma_alignment;
unsigned long dma_boundary;
unsigned long virt_boundary_mask;
/*