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path: root/drivers/ata/ahci.c
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Diffstat (limited to 'drivers/ata/ahci.c')
-rw-r--r--drivers/ata/ahci.c93
1 files changed, 89 insertions, 4 deletions
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 497912732566..495aeed26779 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -1061,6 +1061,86 @@ static inline void ahci_gtf_filter_workaround(struct ata_host *host)
{}
#endif
+int ahci_init_interrupts(struct pci_dev *pdev, struct ahci_host_priv *hpriv)
+{
+ int rc;
+ unsigned int maxvec;
+
+ if (!(hpriv->flags & AHCI_HFLAG_NO_MSI)) {
+ rc = pci_enable_msi_block_auto(pdev, &maxvec);
+ if (rc > 0) {
+ if ((rc == maxvec) || (rc == 1))
+ return rc;
+ /*
+ * Assume that advantage of multipe MSIs is negated,
+ * so fallback to single MSI mode to save resources
+ */
+ pci_disable_msi(pdev);
+ if (!pci_enable_msi(pdev))
+ return 1;
+ }
+ }
+
+ pci_intx(pdev, 1);
+ return 0;
+}
+
+/**
+ * ahci_host_activate - start AHCI host, request IRQs and register it
+ * @host: target ATA host
+ * @irq: base IRQ number to request
+ * @n_msis: number of MSIs allocated for this host
+ * @irq_handler: irq_handler used when requesting IRQs
+ * @irq_flags: irq_flags used when requesting IRQs
+ *
+ * Similar to ata_host_activate, but requests IRQs according to AHCI-1.1
+ * when multiple MSIs were allocated. That is one MSI per port, starting
+ * from @irq.
+ *
+ * LOCKING:
+ * Inherited from calling layer (may sleep).
+ *
+ * RETURNS:
+ * 0 on success, -errno otherwise.
+ */
+int ahci_host_activate(struct ata_host *host, int irq, unsigned int n_msis)
+{
+ int i, rc;
+
+ /* Sharing Last Message among several ports is not supported */
+ if (n_msis < host->n_ports)
+ return -EINVAL;
+
+ rc = ata_host_start(host);
+ if (rc)
+ return rc;
+
+ for (i = 0; i < host->n_ports; i++) {
+ rc = devm_request_threaded_irq(host->dev,
+ irq + i, ahci_hw_interrupt, ahci_thread_fn, IRQF_SHARED,
+ dev_driver_string(host->dev), host->ports[i]);
+ if (rc)
+ goto out_free_irqs;
+ }
+
+ for (i = 0; i < host->n_ports; i++)
+ ata_port_desc(host->ports[i], "irq %d", irq + i);
+
+ rc = ata_host_register(host, &ahci_sht);
+ if (rc)
+ goto out_free_all_irqs;
+
+ return 0;
+
+out_free_all_irqs:
+ i = host->n_ports;
+out_free_irqs:
+ for (i--; i >= 0; i--)
+ devm_free_irq(host->dev, irq + i, host->ports[i]);
+
+ return rc;
+}
+
static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
{
unsigned int board_id = ent->driver_data;
@@ -1069,7 +1149,7 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
struct device *dev = &pdev->dev;
struct ahci_host_priv *hpriv;
struct ata_host *host;
- int n_ports, i, rc;
+ int n_ports, n_msis, i, rc;
int ahci_pci_bar = AHCI_PCI_BAR_STANDARD;
VPRINTK("ENTER\n");
@@ -1156,11 +1236,12 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
if (ahci_sb600_enable_64bit(pdev))
hpriv->flags &= ~AHCI_HFLAG_32BIT_ONLY;
- if ((hpriv->flags & AHCI_HFLAG_NO_MSI) || pci_enable_msi(pdev))
- pci_intx(pdev, 1);
-
hpriv->mmio = pcim_iomap_table(pdev)[ahci_pci_bar];
+ n_msis = ahci_init_interrupts(pdev, hpriv);
+ if (n_msis > 1)
+ hpriv->flags |= AHCI_HFLAG_MULTI_MSI;
+
/* save initial config */
ahci_pci_save_initial_config(pdev, hpriv);
@@ -1256,6 +1337,10 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
ahci_pci_print_info(host);
pci_set_master(pdev);
+
+ if (hpriv->flags & AHCI_HFLAG_MULTI_MSI)
+ return ahci_host_activate(host, pdev->irq, n_msis);
+
return ata_host_activate(host, pdev->irq, ahci_interrupt, IRQF_SHARED,
&ahci_sht);
}