[libata ahci] support PCI MSI interrupt vector (907f4678) · Commits · e / devices / android_kernel_oneplus_sm8150

drivers/scsi/ahci.c

+63 −10

Original line number	Diff line number	Diff line
		@@ -152,6 +152,7 @@ struct ahci_sg {

		struct ahci_host_priv {
		unsigned long flags;
		unsigned int have_msi; /* is PCI MSI enabled? */
		u32 cap; /* cache of HOST_CAP register */
		u32 port_map; /* cache of HOST_PORTS_IMPL reg */
		};
		@@ -182,6 +183,7 @@ static void ahci_qc_prep(struct ata_queued_cmd *qc);
		static u8 ahci_check_status(struct ata_port *ap);
		static u8 ahci_check_err(struct ata_port *ap);
		static inline int ahci_host_intr(struct ata_port ap, struct ata_queued_cmd qc);
		static void ahci_remove_one (struct pci_dev *pdev);

		static Scsi_Host_Template ahci_sht = {
		.module = THIS_MODULE,
		@@ -271,7 +273,7 @@ static struct pci_driver ahci_pci_driver = {
		.name = DRV_NAME,
		.id_table = ahci_pci_tbl,
		.probe = ahci_init_one,
		.remove = ata_pci_remove_one,
		.remove = ahci_remove_one,
		};


		@@ -876,16 +878,20 @@ static int ahci_host_init(struct ata_probe_ent *probe_ent)
		}

		/* move to PCI layer, integrate w/ MSI stuff */
		static void pci_enable_intx(struct pci_dev *pdev)
		static void pci_intx(struct pci_dev *pdev, int enable)
		{
		u16 pci_command;
		u16 pci_command, new;

		pci_read_config_word(pdev, PCI_COMMAND, &pci_command);
		if (pci_command & PCI_COMMAND_INTX_DISABLE) {
		pci_command &= ~PCI_COMMAND_INTX_DISABLE;

		if (enable)
		new = pci_command & ~PCI_COMMAND_INTX_DISABLE;
		else
		new = pci_command \| PCI_COMMAND_INTX_DISABLE;

		if (new != pci_command)
		pci_write_config_word(pdev, PCI_COMMAND, pci_command);
		}
		}

		static void ahci_print_info(struct ata_probe_ent *probe_ent)
		{
		@@ -966,7 +972,7 @@ static int ahci_init_one (struct pci_dev pdev, const struct pci_device_id ent)
		unsigned long base;
		void *mmio_base;
		unsigned int board_idx = (unsigned int) ent->driver_data;
		int pci_dev_busy = 0;
		int have_msi, pci_dev_busy = 0;
		int rc;

		VPRINTK("ENTER\n");
		@@ -984,12 +990,17 @@ static int ahci_init_one (struct pci_dev pdev, const struct pci_device_id ent)
		goto err_out;
		}

		pci_enable_intx(pdev);
		if (pci_enable_msi(pdev) == 0)
		have_msi = 1;
		else {
		pci_intx(pdev, 1);
		have_msi = 0;
		}

		probe_ent = kmalloc(sizeof(*probe_ent), GFP_KERNEL);
		if (probe_ent == NULL) {
		rc = -ENOMEM;
		goto err_out_regions;
		goto err_out_msi;
		}

		memset(probe_ent, 0, sizeof(*probe_ent));
		@@ -1022,6 +1033,8 @@ static int ahci_init_one (struct pci_dev pdev, const struct pci_device_id ent)
		probe_ent->mmio_base = mmio_base;
		probe_ent->private_data = hpriv;

		hpriv->have_msi = have_msi;

		/* initialize adapter */
		rc = ahci_host_init(probe_ent);
		if (rc)
		@@ -1041,7 +1054,11 @@ static int ahci_init_one (struct pci_dev pdev, const struct pci_device_id ent)
		iounmap(mmio_base);
		err_out_free_ent:
		kfree(probe_ent);
		err_out_regions:
		err_out_msi:
		if (have_msi)
		pci_disable_msi(pdev);
		else
		pci_intx(pdev, 0);
		pci_release_regions(pdev);
		err_out:
		if (!pci_dev_busy)
		@@ -1049,6 +1066,42 @@ static int ahci_init_one (struct pci_dev pdev, const struct pci_device_id ent)
		return rc;
		}

		static void ahci_remove_one (struct pci_dev *pdev)
		{
		struct device *dev = pci_dev_to_dev(pdev);
		struct ata_host_set *host_set = dev_get_drvdata(dev);
		struct ahci_host_priv *hpriv = host_set->private_data;
		struct ata_port *ap;
		unsigned int i;
		int have_msi;

		for (i = 0; i < host_set->n_ports; i++) {
		ap = host_set->ports[i];

		scsi_remove_host(ap->host);
		}

		have_msi = hpriv->have_msi;
		free_irq(host_set->irq, host_set);
		host_set->ops->host_stop(host_set);
		iounmap(host_set->mmio_base);

		for (i = 0; i < host_set->n_ports; i++) {
		ap = host_set->ports[i];

		ata_scsi_release(ap->host);
		scsi_host_put(ap->host);
		}

		if (have_msi)
		pci_disable_msi(pdev);
		else
		pci_intx(pdev, 0);
		pci_release_regions(pdev);
		kfree(host_set);
		pci_disable_device(pdev);
		dev_set_drvdata(dev, NULL);
		}

		static int __init ahci_init(void)
		{