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>zero-colors
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afbd39a42e
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8eede5bc4e
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@ -93,6 +93,7 @@ MODULE_DEVICE_TABLE(acpi, ahci_acpi_match);
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static struct platform_driver ahci_driver = {
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static struct platform_driver ahci_driver = {
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.probe = ahci_probe,
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.probe = ahci_probe,
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.remove = ata_platform_remove_one,
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.remove = ata_platform_remove_one,
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.shutdown = ahci_platform_shutdown,
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.driver = {
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.driver = {
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.name = DRV_NAME,
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.name = DRV_NAME,
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.of_match_table = ahci_of_match,
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.of_match_table = ahci_of_match,
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@ -602,6 +602,40 @@ static void ahci_host_stop(struct ata_host *host)
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ahci_platform_disable_resources(hpriv);
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ahci_platform_disable_resources(hpriv);
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}
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}
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/**
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* ahci_platform_shutdown - Disable interrupts and stop DMA for host ports
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* @dev: platform device pointer for the host
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*
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* This function is called during system shutdown and performs the minimal
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* deconfiguration required to ensure that an ahci_platform host cannot
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* corrupt or otherwise interfere with a new kernel being started with kexec.
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*/
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void ahci_platform_shutdown(struct platform_device *pdev)
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{
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struct ata_host *host = platform_get_drvdata(pdev);
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struct ahci_host_priv *hpriv = host->private_data;
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void __iomem *mmio = hpriv->mmio;
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int i;
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for (i = 0; i < host->n_ports; i++) {
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struct ata_port *ap = host->ports[i];
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/* Disable port interrupts */
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if (ap->ops->freeze)
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ap->ops->freeze(ap);
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/* Stop the port DMA engines */
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if (ap->ops->port_stop)
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ap->ops->port_stop(ap);
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}
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/* Disable and clear host interrupts */
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writel(readl(mmio + HOST_CTL) & ~HOST_IRQ_EN, mmio + HOST_CTL);
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readl(mmio + HOST_CTL); /* flush */
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writel(GENMASK(host->n_ports, 0), mmio + HOST_IRQ_STAT);
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}
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EXPORT_SYMBOL_GPL(ahci_platform_shutdown);
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#ifdef CONFIG_PM_SLEEP
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#ifdef CONFIG_PM_SLEEP
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/**
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/**
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* ahci_platform_suspend_host - Suspend an ahci-platform host
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* ahci_platform_suspend_host - Suspend an ahci-platform host
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@ -36,6 +36,8 @@ int ahci_platform_init_host(struct platform_device *pdev,
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const struct ata_port_info *pi_template,
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const struct ata_port_info *pi_template,
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struct scsi_host_template *sht);
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struct scsi_host_template *sht);
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void ahci_platform_shutdown(struct platform_device *pdev);
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int ahci_platform_suspend_host(struct device *dev);
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int ahci_platform_suspend_host(struct device *dev);
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int ahci_platform_resume_host(struct device *dev);
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int ahci_platform_resume_host(struct device *dev);
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int ahci_platform_suspend(struct device *dev);
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int ahci_platform_suspend(struct device *dev);
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