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

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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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1
include/linux/libata.h
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@ -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