libata-pmp: implement qc_defer for command switching PMP support
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>
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@ -7303,6 +7303,7 @@ EXPORT_SYMBOL_GPL(ata_pci_default_filter);
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EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
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EXPORT_SYMBOL_GPL(ata_pci_clear_simplex);
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#endif /* CONFIG_PCI */
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#endif /* CONFIG_PCI */
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EXPORT_SYMBOL_GPL(sata_pmp_qc_defer_cmd_switch);
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EXPORT_SYMBOL_GPL(sata_pmp_read_init_tf);
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EXPORT_SYMBOL_GPL(sata_pmp_read_init_tf);
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EXPORT_SYMBOL_GPL(sata_pmp_read_val);
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EXPORT_SYMBOL_GPL(sata_pmp_read_val);
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EXPORT_SYMBOL_GPL(sata_pmp_write_init_tf);
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EXPORT_SYMBOL_GPL(sata_pmp_write_init_tf);
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@ -69,6 +69,36 @@ static int sata_pmp_write(struct ata_link *link, int reg, u32 val)
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return rc;
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return rc;
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}
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}
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/**
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* sata_pmp_qc_defer_cmd_switch - qc_defer for command switching PMP
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* @qc: ATA command in question
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*
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* A host which has command switching PMP support cannot issue
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* commands to multiple links simultaneously.
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*
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* LOCKING:
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* spin_lock_irqsave(host lock)
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*
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* RETURNS:
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* ATA_DEFER_* if deferring is needed, 0 otherwise.
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*/
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int sata_pmp_qc_defer_cmd_switch(struct ata_queued_cmd *qc)
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{
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struct ata_link *link = qc->dev->link;
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struct ata_port *ap = link->ap;
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if (ap->excl_link == NULL || ap->excl_link == link) {
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if (ap->nr_active_links == 0 || ata_link_active(link)) {
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qc->flags |= ATA_QCFLAG_CLEAR_EXCL;
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return ata_std_qc_defer(qc);
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}
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ap->excl_link = link;
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}
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return ATA_DEFER_PORT;
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}
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/**
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/**
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* sata_pmp_read_init_tf - initialize TF for PMP read
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* sata_pmp_read_init_tf - initialize TF for PMP read
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* @tf: taskfile to initialize
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* @tf: taskfile to initialize
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@ -947,6 +947,7 @@ extern unsigned long ata_pci_default_filter(struct ata_device *, unsigned long);
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/*
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/*
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* PMP
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* PMP
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*/
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*/
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extern int sata_pmp_qc_defer_cmd_switch(struct ata_queued_cmd *qc);
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extern void sata_pmp_read_init_tf(struct ata_taskfile *tf,
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extern void sata_pmp_read_init_tf(struct ata_taskfile *tf,
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struct ata_device *dev, int pmp, int reg);
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struct ata_device *dev, int pmp, int reg);
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extern u32 sata_pmp_read_val(const struct ata_taskfile *tf);
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extern u32 sata_pmp_read_val(const struct ata_taskfile *tf);
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