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NVMe: Add MSI support
Some devices only have support for MSI, not MSI-X. While MSI is more limited, it still provides better performance than line-based interrupts. Signed-off-by: Ramachandra Gajula <rama@fastorsystems.com> Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
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parent
cf9f123b38
commit
fa08a39664
1 changed files with 32 additions and 8 deletions
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@ -1637,7 +1637,8 @@ static int set_queue_count(struct nvme_dev *dev, int count)
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static int nvme_setup_io_queues(struct nvme_dev *dev)
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{
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int result, cpu, i, nr_io_queues, db_bar_size, q_depth;
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struct pci_dev *pdev = dev->pci_dev;
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int result, cpu, i, nr_io_queues, db_bar_size, q_depth, q_count;
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nr_io_queues = num_online_cpus();
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result = set_queue_count(dev, nr_io_queues);
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@ -1646,14 +1647,14 @@ static int nvme_setup_io_queues(struct nvme_dev *dev)
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if (result < nr_io_queues)
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nr_io_queues = result;
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q_count = nr_io_queues;
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/* Deregister the admin queue's interrupt */
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free_irq(dev->entry[0].vector, dev->queues[0]);
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db_bar_size = 4096 + ((nr_io_queues + 1) << (dev->db_stride + 3));
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if (db_bar_size > 8192) {
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iounmap(dev->bar);
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dev->bar = ioremap(pci_resource_start(dev->pci_dev, 0),
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db_bar_size);
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dev->bar = ioremap(pci_resource_start(pdev, 0), db_bar_size);
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dev->dbs = ((void __iomem *)dev->bar) + 4096;
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dev->queues[0]->q_db = dev->dbs;
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}
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@ -1661,19 +1662,36 @@ static int nvme_setup_io_queues(struct nvme_dev *dev)
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for (i = 0; i < nr_io_queues; i++)
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dev->entry[i].entry = i;
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for (;;) {
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result = pci_enable_msix(dev->pci_dev, dev->entry,
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nr_io_queues);
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result = pci_enable_msix(pdev, dev->entry, nr_io_queues);
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if (result == 0) {
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break;
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} else if (result > 0) {
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nr_io_queues = result;
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continue;
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} else {
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nr_io_queues = 1;
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nr_io_queues = 0;
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break;
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}
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}
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if (nr_io_queues == 0) {
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nr_io_queues = q_count;
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for (;;) {
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result = pci_enable_msi_block(pdev, nr_io_queues);
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if (result == 0) {
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for (i = 0; i < nr_io_queues; i++)
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dev->entry[i].vector = i + pdev->irq;
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break;
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} else if (result > 0) {
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nr_io_queues = result;
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continue;
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} else {
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nr_io_queues = 1;
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break;
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}
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}
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}
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result = queue_request_irq(dev, dev->queues[0], "nvme admin");
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/* XXX: handle failure here */
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@ -1854,7 +1872,10 @@ static void nvme_free_dev(struct kref *kref)
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{
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struct nvme_dev *dev = container_of(kref, struct nvme_dev, kref);
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nvme_dev_remove(dev);
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pci_disable_msix(dev->pci_dev);
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if (dev->pci_dev->msi_enabled)
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pci_disable_msi(dev->pci_dev);
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else if (dev->pci_dev->msix_enabled)
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pci_disable_msix(dev->pci_dev);
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iounmap(dev->bar);
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nvme_release_instance(dev);
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nvme_release_prp_pools(dev);
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@ -1987,7 +2008,10 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
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unmap:
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iounmap(dev->bar);
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disable_msix:
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pci_disable_msix(pdev);
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if (dev->pci_dev->msi_enabled)
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pci_disable_msi(dev->pci_dev);
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else if (dev->pci_dev->msix_enabled)
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pci_disable_msix(dev->pci_dev);
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nvme_release_instance(dev);
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nvme_release_prp_pools(dev);
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disable:
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