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-rw-r--r--drivers/scsi/ipr.c108
-rw-r--r--drivers/scsi/ipr.h6
2 files changed, 105 insertions, 9 deletions
diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index 0f8bc772b11..15ce8e51d5d 100644
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -7367,6 +7367,7 @@ static void __devinit ipr_init_ioa_cfg(struct ipr_ioa_cfg *ioa_cfg,
INIT_LIST_HEAD(&ioa_cfg->used_res_q);
INIT_WORK(&ioa_cfg->work_q, ipr_worker_thread);
init_waitqueue_head(&ioa_cfg->reset_wait_q);
+ init_waitqueue_head(&ioa_cfg->msi_wait_q);
ioa_cfg->sdt_state = INACTIVE;
if (ipr_enable_cache)
ioa_cfg->cache_state = CACHE_ENABLED;
@@ -7417,6 +7418,89 @@ ipr_get_chip_cfg(const struct pci_device_id *dev_id)
}
/**
+ * ipr_test_intr - Handle the interrupt generated in ipr_test_msi().
+ * @pdev: PCI device struct
+ *
+ * Description: Simply set the msi_received flag to 1 indicating that
+ * Message Signaled Interrupts are supported.
+ *
+ * Return value:
+ * 0 on success / non-zero on failure
+ **/
+static irqreturn_t __devinit ipr_test_intr(int irq, void *devp)
+{
+ struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *)devp;
+ unsigned long lock_flags = 0;
+ irqreturn_t rc = IRQ_HANDLED;
+
+ spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
+
+ ioa_cfg->msi_received = 1;
+ wake_up(&ioa_cfg->msi_wait_q);
+
+ spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
+ return rc;
+}
+
+/**
+ * ipr_test_msi - Test for Message Signaled Interrupt (MSI) support.
+ * @pdev: PCI device struct
+ *
+ * Description: The return value from pci_enable_msi() can not always be
+ * trusted. This routine sets up and initiates a test interrupt to determine
+ * if the interrupt is received via the ipr_test_intr() service routine.
+ * If the tests fails, the driver will fall back to LSI.
+ *
+ * Return value:
+ * 0 on success / non-zero on failure
+ **/
+static int __devinit ipr_test_msi(struct ipr_ioa_cfg *ioa_cfg,
+ struct pci_dev *pdev)
+{
+ int rc;
+ volatile u32 int_reg;
+ unsigned long lock_flags = 0;
+
+ ENTER;
+
+ spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
+ init_waitqueue_head(&ioa_cfg->msi_wait_q);
+ ioa_cfg->msi_received = 0;
+ ipr_mask_and_clear_interrupts(ioa_cfg, ~IPR_PCII_IOA_TRANS_TO_OPER);
+ writel(IPR_PCII_IO_DEBUG_ACKNOWLEDGE, ioa_cfg->regs.clr_interrupt_mask_reg);
+ int_reg = readl(ioa_cfg->regs.sense_interrupt_mask_reg);
+ spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
+
+ rc = request_irq(pdev->irq, ipr_test_intr, 0, IPR_NAME, ioa_cfg);
+ if (rc) {
+ dev_err(&pdev->dev, "Can not assign irq %d\n", pdev->irq);
+ return rc;
+ } else if (ipr_debug)
+ dev_info(&pdev->dev, "IRQ assigned: %d\n", pdev->irq);
+
+ writel(IPR_PCII_IO_DEBUG_ACKNOWLEDGE, ioa_cfg->regs.sense_interrupt_reg);
+ int_reg = readl(ioa_cfg->regs.sense_interrupt_reg);
+ wait_event_timeout(ioa_cfg->msi_wait_q, ioa_cfg->msi_received, HZ);
+ ipr_mask_and_clear_interrupts(ioa_cfg, ~IPR_PCII_IOA_TRANS_TO_OPER);
+
+ spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
+ if (!ioa_cfg->msi_received) {
+ /* MSI test failed */
+ dev_info(&pdev->dev, "MSI test failed. Falling back to LSI.\n");
+ rc = -EOPNOTSUPP;
+ } else if (ipr_debug)
+ dev_info(&pdev->dev, "MSI test succeeded.\n");
+
+ spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
+
+ free_irq(pdev->irq, ioa_cfg);
+
+ LEAVE;
+
+ return rc;
+}
+
+/**
* ipr_probe_ioa - Allocates memory and does first stage of initialization
* @pdev: PCI device struct
* @dev_id: PCI device id struct
@@ -7441,11 +7525,6 @@ static int __devinit ipr_probe_ioa(struct pci_dev *pdev,
goto out;
}
- if (!(rc = pci_enable_msi(pdev)))
- dev_info(&pdev->dev, "MSI enabled\n");
- else if (ipr_debug)
- dev_info(&pdev->dev, "Cannot enable MSI\n");
-
dev_info(&pdev->dev, "Found IOA with IRQ: %d\n", pdev->irq);
host = scsi_host_alloc(&driver_template, sizeof(*ioa_cfg));
@@ -7519,6 +7598,18 @@ static int __devinit ipr_probe_ioa(struct pci_dev *pdev,
goto cleanup_nomem;
}
+ /* Enable MSI style interrupts if they are supported. */
+ if (!(rc = pci_enable_msi(pdev))) {
+ rc = ipr_test_msi(ioa_cfg, pdev);
+ if (rc == -EOPNOTSUPP)
+ pci_disable_msi(pdev);
+ else if (rc)
+ goto out_msi_disable;
+ else
+ dev_info(&pdev->dev, "MSI enabled with IRQ: %d\n", pdev->irq);
+ } else if (ipr_debug)
+ dev_info(&pdev->dev, "Cannot enable MSI.\n");
+
/* Save away PCI config space for use following IOA reset */
rc = pci_save_state(pdev);
@@ -7556,7 +7647,9 @@ static int __devinit ipr_probe_ioa(struct pci_dev *pdev,
ioa_cfg->ioa_unit_checked = 1;
ipr_mask_and_clear_interrupts(ioa_cfg, ~IPR_PCII_IOA_TRANS_TO_OPER);
- rc = request_irq(pdev->irq, ipr_isr, IRQF_SHARED, IPR_NAME, ioa_cfg);
+ rc = request_irq(pdev->irq, ipr_isr,
+ ioa_cfg->msi_received ? 0 : IRQF_SHARED,
+ IPR_NAME, ioa_cfg);
if (rc) {
dev_err(&pdev->dev, "Couldn't register IRQ %d! rc=%d\n",
@@ -7583,12 +7676,13 @@ cleanup_nolog:
ipr_free_mem(ioa_cfg);
cleanup_nomem:
iounmap(ipr_regs);
+out_msi_disable:
+ pci_disable_msi(pdev);
out_release_regions:
pci_release_regions(pdev);
out_scsi_host_put:
scsi_host_put(host);
out_disable:
- pci_disable_msi(pdev);
pci_disable_device(pdev);
goto out;
}
diff --git a/drivers/scsi/ipr.h b/drivers/scsi/ipr.h
index 79a3ae4fb2c..2d9269b26f8 100644
--- a/drivers/scsi/ipr.h
+++ b/drivers/scsi/ipr.h
@@ -37,8 +37,8 @@
/*
* Literals
*/
-#define IPR_DRIVER_VERSION "2.4.2"
-#define IPR_DRIVER_DATE "(January 21, 2009)"
+#define IPR_DRIVER_VERSION "2.4.3"
+#define IPR_DRIVER_DATE "(June 10, 2009)"
/*
* IPR_MAX_CMD_PER_LUN: This defines the maximum number of outstanding
@@ -1094,6 +1094,7 @@ struct ipr_ioa_cfg {
u8 needs_hard_reset:1;
u8 dual_raid:1;
u8 needs_warm_reset:1;
+ u8 msi_received:1;
u8 revid;
@@ -1179,6 +1180,7 @@ struct ipr_ioa_cfg {
struct work_struct work_q;
wait_queue_head_t reset_wait_q;
+ wait_queue_head_t msi_wait_q;
struct ipr_dump *dump;
enum ipr_sdt_state sdt_state;