Commit e32efbfc authored by Jens Axboe's avatar Jens Axboe

NVMe: make setup work for devices that don't do INTx

The setup/probe part currently relies on INTx being there and
working, that's not always the case. For devices that don't
advertise INTx, enable a single MSIx vector early on and disable
it again before we ask for our full range of queue vecs.
Acked-by: default avatarKeith Busch <keith.busch@intel.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent b3521729
......@@ -1998,6 +1998,13 @@ static int nvme_setup_io_queues(struct nvme_dev *dev)
/* Deregister the admin queue's interrupt */
free_irq(dev->entry[0].vector, adminq);
/*
* If we enable msix early due to not intx, disable it again before
* setting up the full range we need.
*/
if (!pdev->irq)
pci_disable_msix(pdev);
for (i = 0; i < nr_io_queues; i++)
dev->entry[i].entry = i;
vecs = pci_enable_msix_range(pdev, dev->entry, 1, nr_io_queues);
......@@ -2150,10 +2157,22 @@ static int nvme_dev_map(struct nvme_dev *dev)
dev->bar = ioremap(pci_resource_start(pdev, 0), 8192);
if (!dev->bar)
goto disable;
if (readl(&dev->bar->csts) == -1) {
result = -ENODEV;
goto unmap;
}
/*
* Some devices don't advertse INTx interrupts, pre-enable a single
* MSIX vec for setup. We'll adjust this later.
*/
if (!pdev->irq) {
result = pci_enable_msix(pdev, dev->entry, 1);
if (result < 0)
goto unmap;
}
cap = readq(&dev->bar->cap);
dev->q_depth = min_t(int, NVME_CAP_MQES(cap) + 1, NVME_Q_DEPTH);
dev->db_stride = 1 << NVME_CAP_STRIDE(cap);
......
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