diff options
Diffstat (limited to 'drivers/ata/libata.h')
| -rw-r--r-- | drivers/ata/libata.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h index 0dd735c2e5b5..700627596ce1 100644 --- a/drivers/ata/libata.h +++ b/drivers/ata/libata.h @@ -149,6 +149,15 @@ static inline bool ata_acpi_dev_manage_restart(struct ata_device *dev) { return #endif /* libata-scsi.c */ +#define ATA_SCSI_RBUF_SIZE 2048 + +/* + * Maximum number of concurrent positioning ranges (CPR) supported. The ACS + * specifications allow up to 255, but we limit this to the number of CPR + * descriptors that fit in the rbuf buffer used to emit VPD page B9h. + */ +#define ATA_DEV_MAX_CPR min(255, ((ATA_SCSI_RBUF_SIZE - 64) / 32)) + extern struct ata_device *ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev); extern int ata_scsi_add_hosts(struct ata_host *host, |