diff options
| author | Nate Watterson <nwatters@codeaurora.org> | 2017-07-20 22:26:24 +0300 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2017-08-04 23:34:14 +0300 |
| commit | 8eede5bc4ef04281fbba7ddfe157052d0e76075d (patch) | |
| tree | 87c88cf41e67e8168c4fd7c965d7ec323bb76e67 | |
| parent | afbd39a42e2d777852a2809298fd4e71b1e5abf7 (diff) | |
| download | linux-8eede5bc4ef04281fbba7ddfe157052d0e76075d.tar.xz | |
ata: ahci_platform: Add shutdown handler
The newly introduced ahci_platform_shutdown() method is called during
system shutdown to disable host controller DMA and interrupts in order
to avoid potentially corrupting or otherwise interfering with a new
kernel being started with kexec.
Signed-off-by: Nate Watterson <nwatters@codeaurora.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
| -rw-r--r-- | drivers/ata/ahci_platform.c | 1 | ||||
| -rw-r--r-- | drivers/ata/libahci_platform.c | 34 | ||||
| -rw-r--r-- | include/linux/ahci_platform.h | 2 |
3 files changed, 37 insertions, 0 deletions
diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c index 62a04c8fb5c9..99f9a895a459 100644 --- a/drivers/ata/ahci_platform.c +++ b/drivers/ata/ahci_platform.c @@ -93,6 +93,7 @@ MODULE_DEVICE_TABLE(acpi, ahci_acpi_match); static struct platform_driver ahci_driver = { .probe = ahci_probe, .remove = ata_platform_remove_one, + .shutdown = ahci_platform_shutdown, .driver = { .name = DRV_NAME, .of_match_table = ahci_of_match, diff --git a/drivers/ata/libahci_platform.c b/drivers/ata/libahci_platform.c index cd2eab6aa92e..a270a1173c8c 100644 --- a/drivers/ata/libahci_platform.c +++ b/drivers/ata/libahci_platform.c @@ -602,6 +602,40 @@ static void ahci_host_stop(struct ata_host *host) ahci_platform_disable_resources(hpriv); } +/** + * ahci_platform_shutdown - Disable interrupts and stop DMA for host ports + * @dev: platform device pointer for the host + * + * This function is called during system shutdown and performs the minimal + * deconfiguration required to ensure that an ahci_platform host cannot + * corrupt or otherwise interfere with a new kernel being started with kexec. + */ +void ahci_platform_shutdown(struct platform_device *pdev) +{ + struct ata_host *host = platform_get_drvdata(pdev); + struct ahci_host_priv *hpriv = host->private_data; + void __iomem *mmio = hpriv->mmio; + int i; + + for (i = 0; i < host->n_ports; i++) { + struct ata_port *ap = host->ports[i]; + + /* 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); + } + + /* Disable and clear host interrupts */ + writel(readl(mmio + HOST_CTL) & ~HOST_IRQ_EN, mmio + HOST_CTL); + readl(mmio + HOST_CTL); /* flush */ + writel(GENMASK(host->n_ports, 0), mmio + HOST_IRQ_STAT); +} +EXPORT_SYMBOL_GPL(ahci_platform_shutdown); + #ifdef CONFIG_PM_SLEEP /** * ahci_platform_suspend_host - Suspend an ahci-platform host diff --git a/include/linux/ahci_platform.h b/include/linux/ahci_platform.h index a270f25ee7c7..1b0a17b22cd3 100644 --- a/include/linux/ahci_platform.h +++ b/include/linux/ahci_platform.h @@ -36,6 +36,8 @@ int ahci_platform_init_host(struct platform_device *pdev, const struct ata_port_info *pi_template, struct scsi_host_template *sht); +void ahci_platform_shutdown(struct platform_device *pdev); + int ahci_platform_suspend_host(struct device *dev); int ahci_platform_resume_host(struct device *dev); int ahci_platform_suspend(struct device *dev); |