Split interrupt service routine into hardware context handler and
threaded context handler. That allows to protect ports with individual
locks rather than with a single host-wide lock, which results in better
parallelism.
Signed-off-by: Alexander Gordeev
---
drivers/ata/acard-ahci.c|8 ++---
drivers/ata/ahci.c | 54 ++-
drivers/ata/ahci.h | 10 +++--
drivers/ata/ahci_platform.c |3 +-
drivers/ata/libahci.c | 74 +--
5 files changed, 85 insertions(+), 64 deletions(-)
diff --git a/drivers/ata/acard-ahci.c b/drivers/ata/acard-ahci.c
index 4e94ba2..e429225 100644
--- a/drivers/ata/acard-ahci.c
+++ b/drivers/ata/acard-ahci.c
@@ -409,7 +409,7 @@ static int acard_ahci_init_one(struct pci_dev *pdev, const
struct pci_device_id
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;
VPRINTK("ENTER\n");
@@ -436,8 +436,7 @@ static int acard_ahci_init_one(struct pci_dev *pdev, const
struct pci_device_id
return -ENOMEM;
hpriv->flags |= (unsigned long)pi.private_data;
- if (!(hpriv->flags & AHCI_HFLAG_NO_MSI))
- pci_enable_msi(pdev);
+ n_msis = ahci_init_interrupts(pdev, hpriv);
hpriv->mmio = pcim_iomap_table(pdev)[AHCI_PCI_BAR];
@@ -499,8 +498,7 @@ static int acard_ahci_init_one(struct pci_dev *pdev, const
struct pci_device_id
acard_ahci_pci_print_info(host);
pci_set_master(pdev);
- return ata_host_activate(host, pdev->irq, ahci_interrupt, IRQF_SHARED,
-&acard_ahci_sht);
+ return ahci_host_activate(host, pdev->irq, n_msis, &acard_ahci_sht);
}
module_pci_driver(acard_ahci_pci_driver);
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 29ed8a8..7ab3173 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -1080,14 +1080,14 @@ int ahci_init_interrupts(struct pci_dev *pdev, struct
ahci_host_priv *hpriv)
pci_intx(pdev, 1);
return 0;
}
+EXPORT_SYMBOL_GPL(ahci_init_interrupts);
/**
* 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
+ * @sht: scsi_host_template to use when registering the host
*
* 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
@@ -1099,43 +1099,59 @@ int ahci_init_interrupts(struct pci_dev *pdev, struct
ahci_host_priv *hpriv)
* RETURNS:
* 0 on success, -errno otherwise.
*/
-int ahci_host_activate(struct ata_host *host, int irq, unsigned int n_msis)
+int ahci_host_activate(struct ata_host *host, int irq, unsigned int n_msis,
+ struct scsi_host_template *sht)
{
int i, rc;
-
- /* Sharing Last Message among several ports is not supported */
- if (n_msis < host->n_ports)
- return -EINVAL;
+ unsigned int n_irqs;
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]);
+ n_irqs = min(host->n_ports, n_msis);
+ n_irqs = max(n_irqs, 1u);
+
+ if (n_irqs > 1) {
+ /* Sharing Last Message among several ports is not supported */
+ if (n_irqs < host->n_ports)
+ return -EINVAL;
+
+ for (i = 0; i < n_irqs; i++) {
+ rc = devm_request_threaded_irq(host->dev, irq + i,
+ ahci_multi_irqs_intr, ahci_port_thread_fn,
+ IRQF_SHARED, dev_driver_string(host->dev),
+ host->ports[i]);
+ if (rc)
+ goto out_free_irqs;
+ }
+ } else {
+ rc = devm_request_threaded_irq(host->dev, irq,
+ ahci_single_irq_intr, ahci_thread_fn, IRQF_SHARED,
+ dev_driver_string(host->dev), host);
if (rc)
- goto out_free_irqs;
+ goto out;
}
- for (i = 0; i < host->n_ports; i++)
+ for (i = 0; i < n_irqs; i++)
ata_port_desc(host->ports[i], "irq %d", irq + i);
- rc = ata_host_register(host, &ahci_sht);
+ rc = ata_host_register(host, sht);
if (rc)
goto out_free_all_irqs;
return 0;
