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libahci: Implement the capability to override the generic ahci interrupt handler.

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This patch implements the capability to override the generic AHCI
interrupt handler so that specific ahci drivers can implement their
own custom interrupt handler routines.  It also exports
ahci_handle_port_intr so that custom irq_handler implementations can
use it.

tj: s/ahci_irq_handler/irq_handler/ and updated description.

Signed-off-by: Suman Tripathi <stripathi@apm.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Suman Tripathi 2016-02-06 11:25:22 +05:30 committed by Tejun Heo
parent 342decff2b
commit f070d67155
2 changed files with 22 additions and 7 deletions
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2
drivers/ata/ahci.h
View File

@ -361,6 +361,7 @@ struct ahci_host_priv {
* be overridden anytime before the host is activated.
*/
void (*start_engine)(struct ata_port *ap);
irqreturn_t (*irq_handler)(int irq, void *dev_instance);
};
#ifdef CONFIG_PCI_MSI
@ -424,6 +425,7 @@ int ahci_reset_em(struct ata_host *host);
void ahci_print_info(struct ata_host *host, const char *scc_s);
int ahci_host_activate(struct ata_host *host, struct scsi_host_template *sht);
void ahci_error_handler(struct ata_port *ap);
u32 ahci_handle_port_intr(struct ata_host *host, u32 irq_masked);
static inline void __iomem *__ahci_port_base(struct ata_host *host,
unsigned int port_no)

27
drivers/ata/libahci.c
View File

@ -113,6 +113,9 @@ static ssize_t ahci_store_em_buffer(struct device *dev,
const char *buf, size_t size);
static ssize_t ahci_show_em_supported(struct device *dev,
struct device_attribute *attr, char *buf);
static irqreturn_t ahci_single_edge_irq_intr(int irq, void *dev_instance);
static irqreturn_t ahci_single_level_irq_intr(int irq, void *dev_instance);
static DEVICE_ATTR(ahci_host_caps, S_IRUGO, ahci_show_host_caps, NULL);
static DEVICE_ATTR(ahci_host_cap2, S_IRUGO, ahci_show_host_cap2, NULL);
@ -512,6 +515,11 @@ void ahci_save_initial_config(struct device *dev, struct ahci_host_priv *hpriv)
if (!hpriv->start_engine)
hpriv->start_engine = ahci_start_engine;
if (!hpriv->irq_handler)
hpriv->irq_handler = (hpriv->flags & AHCI_HFLAG_EDGE_IRQ) ?
ahci_single_edge_irq_intr :
ahci_single_level_irq_intr;
}
EXPORT_SYMBOL_GPL(ahci_save_initial_config);
@ -1846,7 +1854,7 @@ static irqreturn_t ahci_multi_irqs_intr_hard(int irq, void *dev_instance)
return IRQ_HANDLED;
}
static u32 ahci_handle_port_intr(struct ata_host *host, u32 irq_masked)
u32 ahci_handle_port_intr(struct ata_host *host, u32 irq_masked)
{
unsigned int i, handled = 0;
@ -1872,6 +1880,7 @@ static u32 ahci_handle_port_intr(struct ata_host *host, u32 irq_masked)
return handled;
}
EXPORT_SYMBOL_GPL(ahci_handle_port_intr);
static irqreturn_t ahci_single_edge_irq_intr(int irq, void *dev_instance)
{
@ -2535,14 +2544,18 @@ int ahci_host_activate(struct ata_host *host, struct scsi_host_template *sht)
int irq = hpriv->irq;
int rc;
if (hpriv->flags & (AHCI_HFLAG_MULTI_MSI | AHCI_HFLAG_MULTI_MSIX))
if (hpriv->flags & (AHCI_HFLAG_MULTI_MSI | AHCI_HFLAG_MULTI_MSIX)) {
if (hpriv->irq_handler)
dev_warn(host->dev, "both AHCI_HFLAG_MULTI_MSI flag set \
and custom irq handler implemented\n");
rc = ahci_host_activate_multi_irqs(host, sht);
else if (hpriv->flags & AHCI_HFLAG_EDGE_IRQ)
rc = ata_host_activate(host, irq, ahci_single_edge_irq_intr,
IRQF_SHARED, sht);
else
rc = ata_host_activate(host, irq, ahci_single_level_irq_intr,
} else {
rc = ata_host_activate(host, irq, hpriv->irq_handler,
IRQF_SHARED, sht);
}
return rc;
}
EXPORT_SYMBOL_GPL(ahci_host_activate);