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libata: set queue SSD flag for SSD devices

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SSD devices should give an RPM setting of 1 in word 217 of the ID
page. If we see such a device, tell the block layer about it.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe 2008-09-24 13:05:10 +02:00
parent a68bbddba4
commit 8bff7c6b0f
2 changed files with 10 additions and 0 deletions
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4
drivers/ata/libata-scsi.c
View file

@ -977,6 +977,10 @@ static int ata_scsi_dev_config(struct scsi_device *sdev,
blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN);
} else {
if (ata_id_is_ssd(dev->id))
queue_flag_set_unlocked(QUEUE_FLAG_NONROT,
sdev->request_queue);
/* ATA devices must be sector aligned */
blk_queue_update_dma_alignment(sdev->request_queue,
ATA_SECT_SIZE - 1);

6
include/linux/ata.h
View file

@ -88,6 +88,7 @@ enum {
ATA_ID_DLF = 128,
ATA_ID_CSFO = 129,
ATA_ID_CFA_POWER = 160,
ATA_ID_ROT_SPEED = 217,
ATA_ID_PIO4 = (1 << 1),
ATA_ID_SERNO_LEN = 20,
@ -691,6 +692,11 @@ static inline int ata_id_is_cfa(const u16 *id)
return 0;
}
static inline int ata_id_is_ssd(const u16 *id)
{
return id[ATA_ID_ROT_SPEED] == 0x01;
}
static inline int ata_drive_40wire(const u16 *dev_id)
{
if (ata_id_is_sata(dev_id))