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libata-pmp: implement qc_defer for command switching PMP support

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Implement sata_pmp_qc_defer_cmd_switch() - standard qc_defer for
command switching PMP support.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo 2007-09-23 13:19:54 +09:00 • committed by Jeff Garzik
parent d0df8b5d0f
commit 31f8838444
3 changed files with 32 additions and 0 deletions
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include/linux/libata.h
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@ -947,6 +947,7 @@ extern unsigned long ata_pci_default_filter(struct ata_device *, unsigned long);
/*
* PMP
*/
extern int sata_pmp_qc_defer_cmd_switch(struct ata_queued_cmd *qc);
extern void sata_pmp_read_init_tf(struct ata_taskfile *tf,
struct ata_device *dev, int pmp, int reg);
extern u32 sata_pmp_read_val(const struct ata_taskfile *tf);