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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>
This commit is contained in:
Prabhakar Kushwaha 2020-01-25 03:37:29 +00:00 committed by Jens Axboe
parent 73e4eab0a8
commit 10a663a1b1
3 changed files with 29 additions and 0 deletions
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7
drivers/ata/ahci.c
View File

@ -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);

21
drivers/ata/libata-core.c
View File

@ -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);

1
include/linux/libata.h
View File

@ -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