redonkable/alistair23-linux
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isci: rely on irq core for intx multiplexing, and silence screaming intx

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Remove the extra logic to poll each controller for interrupts, that's
the core's job for shared interrupts.

While testing noticed that a number of interrupts fire while waiting for
the completion tasklet to run, so added an irq-ack.

Reported-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2011-04-19 12:32:51 -07:00
parent e2023b8735
commit 31e824ed0d
2 changed files with 22 additions and 21 deletions
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26
drivers/scsi/isci/host.c
View file

@ -77,23 +77,19 @@ irqreturn_t isci_msix_isr(int vec, void *data)
irqreturn_t isci_intx_isr(int vec, void *data)
{
struct pci_dev *pdev = data;
struct isci_host *ihost;
irqreturn_t ret = IRQ_NONE;
int i;
struct isci_host *ihost = data;
struct scic_sds_controller *scic = ihost->core_controller;
for_each_isci_host(i, ihost, pdev) {
struct scic_sds_controller *scic = ihost->core_controller;
if (scic_sds_controller_isr(scic)) {
tasklet_schedule(&ihost->completion_tasklet);
ret = IRQ_HANDLED;
} else if (scic_sds_controller_error_isr(scic)) {
spin_lock(&ihost->scic_lock);
scic_sds_controller_error_handler(scic);
spin_unlock(&ihost->scic_lock);
ret = IRQ_HANDLED;
}
if (scic_sds_controller_isr(scic)) {
writel(SMU_ISR_COMPLETION, &scic->smu_registers->interrupt_status);
tasklet_schedule(&ihost->completion_tasklet);
ret = IRQ_HANDLED;
} else if (scic_sds_controller_error_isr(scic)) {
spin_lock(&ihost->scic_lock);
scic_sds_controller_error_handler(scic);
spin_unlock(&ihost->scic_lock);
ret = IRQ_HANDLED;
}
return ret;

17
drivers/scsi/isci/init.c
View file

@ -335,6 +335,7 @@ static int num_controllers(struct pci_dev *pdev)
static int isci_setup_interrupts(struct pci_dev *pdev)
{
int err, i, num_msix;
struct isci_host *ihost;
struct isci_pci_info *pci_info = to_pci_info(pdev);
/*
@ -353,9 +354,9 @@ static int isci_setup_interrupts(struct pci_dev *pdev)
for (i = 0; i < num_msix; i++) {
int id = i / SCI_NUM_MSI_X_INT;
struct msix_entry *msix = &pci_info->msix_entries[i];
struct isci_host *isci_host = pci_info->hosts[id];
irq_handler_t isr;
ihost = pci_info->hosts[id];
/* odd numbered vectors are error interrupts */
if (i & 1)
isr = isci_error_isr;
@ -363,16 +364,16 @@ static int isci_setup_interrupts(struct pci_dev *pdev)
isr = isci_msix_isr;
err = devm_request_irq(&pdev->dev, msix->vector, isr, 0,
DRV_NAME"-msix", isci_host);
DRV_NAME"-msix", ihost);
if (!err)
continue;
dev_info(&pdev->dev, "msix setup failed falling back to intx\n");
while (i--) {
id = i / SCI_NUM_MSI_X_INT;
isci_host = pci_info->hosts[id];
ihost = pci_info->hosts[id];
msix = &pci_info->msix_entries[i];
devm_free_irq(&pdev->dev, msix->vector, isci_host);
devm_free_irq(&pdev->dev, msix->vector, ihost);
}
pci_disable_msix(pdev);
goto intx;
@ -380,8 +381,12 @@ static int isci_setup_interrupts(struct pci_dev *pdev)
return 0;
intx:
err = devm_request_irq(&pdev->dev, pdev->irq, isci_intx_isr,
IRQF_SHARED, DRV_NAME"-intx", pdev);
for_each_isci_host(i, ihost, pdev) {
err = devm_request_irq(&pdev->dev, pdev->irq, isci_intx_isr,
IRQF_SHARED, DRV_NAME"-intx", ihost);
if (err)
break;
}
return err;
}