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authorKeith Busch <keith.busch@intel.com>2016-04-08 16:09:10 -0600
committerJens Axboe <axboe@fb.com>2016-04-12 13:44:00 -0600
commit788e15abbb9408c9399d7e3445ac9afb3b2fd7d6 (patch)
tree39a05fb007574db3ad1b7f8f329114042883a162 /drivers/nvme
parente0489487ec9cd79ee1fa0dc5d3789c08b0e51a2c (diff)
downloadlinux-788e15abbb9408c9399d7e3445ac9afb3b2fd7d6.tar.bz2
NVMe: Always use MSI/MSI-x interrupts
Multiple users have reported device initialization failure due the driver not receiving legacy PCI interrupts. This is not unique to any particular controller, but has been observed on multiple platforms. There have been no issues reported or observed when with message signaled interrupts, so this patch attempts to use MSI-x during initialization, falling back to MSI. If that fails, legacy would become the default. The setup_io_queues error handling had to change as a result: the admin queue's msix_entry used to be initialized to the legacy IRQ. The case where nr_io_queues is 0 would fail request_irq when setting up the admin queue's interrupt since re-enabling MSI-x fails with 0 vectors, leaving the admin queue's msix_entry invalid. Instead, return success immediately. Reported-by: Tim Muhlemmer <muhlemmer@gmail.com> Reported-by: Jon Derrick <jonathan.derrick@intel.com> Signed-off-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/nvme')
-rw-r--r--drivers/nvme/host/pci.c25
1 files changed, 15 insertions, 10 deletions
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 24ccda303efb..94d45b00d40f 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -1478,8 +1478,7 @@ static int nvme_setup_io_queues(struct nvme_dev *dev)
if (result > 0) {
dev_err(dev->ctrl.device,
"Could not set queue count (%d)\n", result);
- nr_io_queues = 0;
- result = 0;
+ return 0;
}
if (dev->cmb && NVME_CMB_SQS(dev->cmbsz)) {
@@ -1513,7 +1512,9 @@ static int nvme_setup_io_queues(struct nvme_dev *dev)
* If we enable msix early due to not intx, disable it again before
* setting up the full range we need.
*/
- if (!pdev->irq)
+ if (pdev->msi_enabled)
+ pci_disable_msi(pdev);
+ else if (pdev->msix_enabled)
pci_disable_msix(pdev);
for (i = 0; i < nr_io_queues; i++)
@@ -1696,7 +1697,6 @@ static int nvme_pci_enable(struct nvme_dev *dev)
if (pci_enable_device_mem(pdev))
return result;
- dev->entry[0].vector = pdev->irq;
pci_set_master(pdev);
if (dma_set_mask_and_coherent(dev->dev, DMA_BIT_MASK(64)) &&
@@ -1709,13 +1709,18 @@ static int nvme_pci_enable(struct nvme_dev *dev)
}
/*
- * Some devices don't advertse INTx interrupts, pre-enable a single
- * MSIX vec for setup. We'll adjust this later.
+ * Some devices and/or platforms don't advertise or work with INTx
+ * interrupts. Pre-enable a single MSIX or MSI vec for setup. We'll
+ * adjust this later.
*/
- if (!pdev->irq) {
- result = pci_enable_msix(pdev, dev->entry, 1);
- if (result < 0)
- goto disable;
+ if (pci_enable_msix(pdev, dev->entry, 1)) {
+ pci_enable_msi(pdev);
+ dev->entry[0].vector = pdev->irq;
+ }
+
+ if (!dev->entry[0].vector) {
+ result = -ENODEV;
+ goto disable;
}
cap = lo_hi_readq(dev->bar + NVME_REG_CAP);