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Revert "AHCI: Optimize single IRQ interrupt processing" 

This reverts commit 18dcf433f3.
IRQF_ONESHOT was missing from the conversion causing screaming
interrupts problems on some setups and LKP detected measureable drop
in IO performance.  It looks like we'll first need to drop the
threaded IRQ handling first before splitting locking.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Alexander Gordeev <agordeev@redhat.com>
Reported-by: kernel test robot <fengguang.wu@intel.com>
Reported-by: Marc Zyngier <marc.zyngier@arm.com>
Link: http://lkml.kernel.org/g/20141027021651.GF27038@yliu-dev.sh.intel.com
Link: http://lkml.kernel.org/g/1414082970-20775-1-git-send-email-marc.zyngier@arm.com
This commit is contained in:
Tejun Heo 2014-10-27 09:50:36 -04:00
parent 03e83cbd34
commit 7865f83fd2
1 changed files with 13 additions and 61 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

74
drivers/ata/libahci.c
View File

@ -1778,16 +1778,15 @@ static void ahci_handle_port_interrupt(struct ata_port *ap,
}
}
static void ahci_update_intr_status(struct ata_port *ap)
static void ahci_port_intr(struct ata_port *ap)
{
void __iomem *port_mmio = ahci_port_base(ap);
struct ahci_port_priv *pp = ap->private_data;
u32 status;
status = readl(port_mmio + PORT_IRQ_STAT);
writel(status, port_mmio + PORT_IRQ_STAT);
atomic_or(status, &pp->intr_status);
ahci_handle_port_interrupt(ap, port_mmio, status);
}
static irqreturn_t ahci_port_thread_fn(int irq, void *dev_instance)
@ -1808,34 +1807,6 @@ static irqreturn_t ahci_port_thread_fn(int irq, void *dev_instance)
return IRQ_HANDLED;
}
irqreturn_t ahci_thread_fn(int irq, void *dev_instance)
{
struct ata_host *host = dev_instance;
struct ahci_host_priv *hpriv = host->private_data;
u32 irq_masked = hpriv->port_map;
unsigned int i;
for (i = 0; i < host->n_ports; i++) {
struct ata_port *ap;
if (!(irq_masked & (1 << i)))
continue;
ap = host->ports[i];
if (ap) {
ahci_port_thread_fn(irq, ap);
VPRINTK("port %u\n", i);
} else {
VPRINTK("port %u (no irq)\n", i);
if (ata_ratelimit())
dev_warn(host->dev,
"interrupt on disabled port %u\n", i);
}
}
return IRQ_HANDLED;
}
static irqreturn_t ahci_multi_irqs_intr(int irq, void *dev_instance)
{
struct ata_port *ap = dev_instance;
@ -1885,7 +1856,7 @@ static irqreturn_t ahci_single_irq_intr(int irq, void *dev_instance)
ap = host->ports[i];
if (ap) {
ahci_update_intr_status(ap);
ahci_port_intr(ap);
VPRINTK("port %u\n", i);
} else {
VPRINTK("port %u (no irq)\n", i);
@ -1912,7 +1883,7 @@ static irqreturn_t ahci_single_irq_intr(int irq, void *dev_instance)
VPRINTK("EXIT\n");
return handled ? IRQ_WAKE_THREAD : IRQ_NONE;
return IRQ_RETVAL(handled);
}
unsigned int ahci_qc_issue(struct ata_queued_cmd *qc)
@ -2324,8 +2295,13 @@ static int ahci_port_start(struct ata_port *ap)
*/
pp->intr_mask = DEF_PORT_IRQ;
spin_lock_init(&pp->lock);
ap->lock = &pp->lock;
/*
* Switch to per-port locking in case each port has its own MSI vector.
*/
if ((hpriv->flags & AHCI_HFLAG_MULTI_MSI)) {
spin_lock_init(&pp->lock);
ap->lock = &pp->lock;
}
ap->private_data = pp;
@ -2486,31 +2462,6 @@ static int ahci_host_activate_multi_irqs(struct ata_host *host, int irq,
return rc;
}
static int ahci_host_activate_single_irq(struct ata_host *host, int irq,
struct scsi_host_template *sht)
{
int i, rc;
rc = ata_host_start(host);
if (rc)
return rc;
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)
return rc;
for (i = 0; i < host->n_ports; i++)
ata_port_desc(host->ports[i], "irq %d", irq);
rc = ata_host_register(host, sht);
if (rc)
devm_free_irq(host->dev, irq, host);
return rc;
}
/**
* ahci_host_activate - start AHCI host, request IRQs and register it
* @host: target ATA host
@ -2536,7 +2487,8 @@ int ahci_host_activate(struct ata_host *host, int irq,
if (hpriv->flags & AHCI_HFLAG_MULTI_MSI)
rc = ahci_host_activate_multi_irqs(host, irq, sht);
else
rc = ahci_host_activate_single_irq(host, irq, sht);
rc = ata_host_activate(host, irq, ahci_single_irq_intr,
IRQF_SHARED, sht);
return rc;
}
EXPORT_SYMBOL_GPL(ahci_host_activate);