From 31e824ed0d8c84c5232405167b2338ffc071ae8a Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Tue, 19 Apr 2011 12:32:51 -0700 Subject: [PATCH] isci: rely on irq core for intx multiplexing, and silence screaming intx 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 Signed-off-by: Dan Williams --- drivers/scsi/isci/host.c | 26 +++++++++++--------------- drivers/scsi/isci/init.c | 17 +++++++++++------ 2 files changed, 22 insertions(+), 21 deletions(-) diff --git a/drivers/scsi/isci/host.c b/drivers/scsi/isci/host.c index 927f088..0d706b2 100644 --- a/drivers/scsi/isci/host.c +++ b/drivers/scsi/isci/host.c @@ -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; diff --git a/drivers/scsi/isci/init.c b/drivers/scsi/isci/init.c index 015ce94..5a9cd5f 100644 --- a/drivers/scsi/isci/init.c +++ b/drivers/scsi/isci/init.c @@ -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; } -- 2.7.4