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authorLinus Torvalds <torvalds@linux-foundation.org>2016-01-11 19:33:59 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-01-11 19:33:59 -0800
commit8c930204ce76eddeb2e1af66a75f0ab2506c76e2 (patch)
treecdc3f5ac1b799efd1d54200e08848ccf2bfedb41 /drivers/ata/libahci.c
parent367262c1be4bbf23938175a93eb573b289a00027 (diff)
parente39b2bb3b72b999a04e8d295882be3255aca5ade (diff)
Merge branch 'for-4.5' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata
Pull libata updates from Tejun Heo: "Mostly low level driver specific changes. Two changes are somewhat noteworthy. First, Dan's patchset to support per-port msix interrupt handling for ahci, which was tried last cycle but had to be backed out due to a couple issues, is back and seems to be working fine. Second, libata exception handling now uses usleep_range() instead of msleep() for sleeps < 20ms which can make things snappier in some corner cases" * 'for-4.5' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata: libata: skip debounce delay on link resume ata: ahci_brcmstb: disable DIPM support ata: ahci_brcmstb: enable support for ALPM drivers: libata-core: Use usleep_range() instead of msleep() for short sleeps (<20 ms) sata_sx4: correctly handling failed allocation ata: ahci_brcmstb: add support for MIPS-based platforms ahci: qoriq: Adjust the default register values on ls1021a ahci: qoriq: Update the default Rx watermark value ahci: qoriq: Adjust the default register values on ls1043a ahci: compile out msi/msix infrastructure ata: core: fix irq description on AHCI single irq systems ata: ahci_brcmstb: remove unused definitions ata: ahci_brcmstb: add a quirk for MIPS-based platforms ata: ahci_brcmstb: disable NCQ for MIPS-based platforms ata: sata_rcar: Remove obsolete platform_device_id entries sata_rcar: Add compatible string for r8a7795 ahci: kill 'intr_status' ahci: switch from 'threaded' to 'hardirq' interrupt handling ahci: per-port msix support
Diffstat (limited to 'drivers/ata/libahci.c')
-rw-r--r--drivers/ata/libahci.c46
1 files changed, 16 insertions, 30 deletions
diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index 4665512dae44..d61740e78d6d 100644
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -43,6 +43,7 @@
#include <scsi/scsi_host.h>
#include <scsi/scsi_cmnd.h>
#include <linux/libata.h>
+#include <linux/pci.h>
#include "ahci.h"
#include "libata.h"
@@ -1804,41 +1805,24 @@ static void ahci_port_intr(struct ata_port *ap)
ahci_handle_port_interrupt(ap, port_mmio, status);
}
-static irqreturn_t ahci_port_thread_fn(int irq, void *dev_instance)
+static irqreturn_t ahci_multi_irqs_intr_hard(int irq, void *dev_instance)
{
struct ata_port *ap = dev_instance;
- struct ahci_port_priv *pp = ap->private_data;
void __iomem *port_mmio = ahci_port_base(ap);
u32 status;
- status = atomic_xchg(&pp->intr_status, 0);
- if (!status)
- return IRQ_NONE;
-
- spin_lock_bh(ap->lock);
- ahci_handle_port_interrupt(ap, port_mmio, status);
- spin_unlock_bh(ap->lock);
-
- return IRQ_HANDLED;
-}
-
-static irqreturn_t ahci_multi_irqs_intr(int irq, void *dev_instance)
-{
- struct ata_port *ap = dev_instance;
- void __iomem *port_mmio = ahci_port_base(ap);
- struct ahci_port_priv *pp = ap->private_data;
- u32 status;
-
VPRINTK("ENTER\n");
status = readl(port_mmio + PORT_IRQ_STAT);
writel(status, port_mmio + PORT_IRQ_STAT);
- atomic_or(status, &pp->intr_status);
+ spin_lock(ap->lock);
+ ahci_handle_port_interrupt(ap, port_mmio, status);
+ spin_unlock(ap->lock);
VPRINTK("EXIT\n");
- return IRQ_WAKE_THREAD;
+ return IRQ_HANDLED;
}
static u32 ahci_handle_port_intr(struct ata_host *host, u32 irq_masked)
@@ -2479,9 +2463,10 @@ void ahci_set_em_messages(struct ahci_host_priv *hpriv,
}
EXPORT_SYMBOL_GPL(ahci_set_em_messages);
-static int ahci_host_activate_multi_irqs(struct ata_host *host, int irq,
+static int ahci_host_activate_multi_irqs(struct ata_host *host,
struct scsi_host_template *sht)
{
+ struct ahci_host_priv *hpriv = host->private_data;
int i, rc;
rc = ata_host_start(host);
@@ -2493,6 +2478,7 @@ static int ahci_host_activate_multi_irqs(struct ata_host *host, int irq,
*/
for (i = 0; i < host->n_ports; i++) {
struct ahci_port_priv *pp = host->ports[i]->private_data;
+ int irq = ahci_irq_vector(hpriv, i);
/* Do not receive interrupts sent by dummy ports */
if (!pp) {
@@ -2500,14 +2486,14 @@ static int ahci_host_activate_multi_irqs(struct ata_host *host, int irq,
continue;
}
- rc = devm_request_threaded_irq(host->dev, irq + i,
- ahci_multi_irqs_intr,
- ahci_port_thread_fn, 0,
- pp->irq_desc, host->ports[i]);
+ rc = devm_request_irq(host->dev, irq, ahci_multi_irqs_intr_hard,
+ 0, pp->irq_desc, host->ports[i]);
+
if (rc)
return rc;
- ata_port_desc(host->ports[i], "irq %d", irq + i);
+ ata_port_desc(host->ports[i], "irq %d", irq);
}
+
return ata_host_register(host, sht);
}
@@ -2528,8 +2514,8 @@ 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)
- rc = ahci_host_activate_multi_irqs(host, irq, sht);
+ if (hpriv->flags & (AHCI_HFLAG_MULTI_MSI | AHCI_HFLAG_MULTI_MSIX))
+ 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);