ata: ahci: Add shutdown to freeze hardware resources of ahci

device_shutdown() called from reboot or power_shutdown expect
all devices to be shutdown. Same is true for even ahci pci driver.
As no ahci shutdown function is implemented, the ata subsystem
always remains alive with DMA & interrupt support. File system
related calls should not be honored after device_shutdown().

So defining ahci pci driver shutdown to freeze hardware (mask
interrupt, stop DMA engine and free DMA resources).

Signed-off-by: Prabhakar Kushwaha <pkushwaha@marvell.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 4bfd1b1..11ea1af 100644 (file)
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -81,6 +81,7 @@ enum board_ids {
 
 static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
 static void ahci_remove_one(struct pci_dev *dev);
+static void ahci_shutdown_one(struct pci_dev *dev);
 static int ahci_vt8251_hardreset(struct ata_link *link, unsigned int *class,
                                 unsigned long deadline);
 static int ahci_avn_hardreset(struct ata_link *link, unsigned int *class,
@@ -606,6 +607,7 @@ static struct pci_driver ahci_pci_driver = {
        .id_table               = ahci_pci_tbl,
        .probe                  = ahci_init_one,
        .remove                 = ahci_remove_one,
+       .shutdown               = ahci_shutdown_one,
        .driver = {
                .pm             = &ahci_pci_pm_ops,
        },
@@ -1877,6 +1879,11 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
        return 0;
 }
 
+static void ahci_shutdown_one(struct pci_dev *pdev)
+{
+       ata_pci_shutdown_one(pdev);
+}
+
 static void ahci_remove_one(struct pci_dev *pdev)
 {
        pm_runtime_get_noresume(&pdev->dev);

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 6f4ab5c..42c8728 100644 (file)
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -6767,6 +6767,26 @@ void ata_pci_remove_one(struct pci_dev *pdev)
        ata_host_detach(host);
 }
 
+void ata_pci_shutdown_one(struct pci_dev *pdev)
+{
+       struct ata_host *host = pci_get_drvdata(pdev);
+       int i;
+
+       for (i = 0; i < host->n_ports; i++) {
+               struct ata_port *ap = host->ports[i];
+
+               ap->pflags |= ATA_PFLAG_FROZEN;
+
+               /* Disable port interrupts */
+               if (ap->ops->freeze)
+                       ap->ops->freeze(ap);
+
+               /* Stop the port DMA engines */
+               if (ap->ops->port_stop)
+                       ap->ops->port_stop(ap);
+       }
+}
+
 /* move to PCI subsystem */
 int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits)
 {
@@ -7387,6 +7407,7 @@ EXPORT_SYMBOL_GPL(ata_timing_cycle2mode);
 
 #ifdef CONFIG_PCI
 EXPORT_SYMBOL_GPL(pci_test_config_bits);
+EXPORT_SYMBOL_GPL(ata_pci_shutdown_one);
 EXPORT_SYMBOL_GPL(ata_pci_remove_one);
 #ifdef CONFIG_PM
 EXPORT_SYMBOL_GPL(ata_pci_device_do_suspend);

diff --git a/include/linux/libata.h b/include/linux/libata.h
index 2dbde11..bff5399 100644 (file)
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1221,6 +1221,7 @@ struct pci_bits {
 };
 
 extern int pci_test_config_bits(struct pci_dev *pdev, const struct pci_bits *bits);
+extern void ata_pci_shutdown_one(struct pci_dev *pdev);
 extern void ata_pci_remove_one(struct pci_dev *pdev);
 
 #ifdef CONFIG_PM