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nvme: properly handle case where pci_alloc_msix does not alloc all vectors

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Reported by: Sean Kelly <smkelly@smkelly.org>
MFC after:	3 days
Sponsored by:	Intel
This commit is contained in:
jimharris 2015-07-23 15:35:08 +00:00
parent d1219ae762
commit 1521348f88
1 changed files with 28 additions and 6 deletions
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34
sys/dev/nvme/nvme_ctrlr.c
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@ -930,7 +930,8 @@ nvme_ctrlr_construct(struct nvme_controller *ctrlr, device_t dev)
{
union cap_lo_register cap_lo;
union cap_hi_register cap_hi;
int i, num_vectors, per_cpu_io_queues, rid;
int i, per_cpu_io_queues, rid;
int num_vectors_requested, num_vectors_allocated;
int status, timeout_period;
ctrlr->dev = dev;
@ -988,7 +989,7 @@ nvme_ctrlr_construct(struct nvme_controller *ctrlr, device_t dev)
}
/* One vector per IO queue, plus one vector for admin queue. */
num_vectors = ctrlr->num_io_queues + 1;
num_vectors_requested = ctrlr->num_io_queues + 1;
/*
* If we cannot even allocate 2 vectors (one for admin, one for
@ -997,15 +998,36 @@ nvme_ctrlr_construct(struct nvme_controller *ctrlr, device_t dev)
if (pci_msix_count(dev) < 2) {
ctrlr->msix_enabled = 0;
goto intx;
} else if (pci_msix_count(dev) < num_vectors) {
} else if (pci_msix_count(dev) < num_vectors_requested) {
ctrlr->per_cpu_io_queues = FALSE;
ctrlr->num_io_queues = 1;
num_vectors = 2; /* one for admin, one for I/O */
num_vectors_requested = 2; /* one for admin, one for I/O */
}
if (pci_alloc_msix(dev, &num_vectors) != 0) {
num_vectors_allocated = num_vectors_requested;
if (pci_alloc_msix(dev, &num_vectors_allocated) != 0) {
ctrlr->msix_enabled = 0;
goto intx;
} else if (num_vectors_allocated < num_vectors_requested) {
if (num_vectors_allocated < 2) {
pci_release_msi(dev);
ctrlr->msix_enabled = 0;
goto intx;
} else {
ctrlr->per_cpu_io_queues = FALSE;
ctrlr->num_io_queues = 1;
/*
* Release whatever vectors were allocated, and just
* reallocate the two needed for the admin and single
* I/O qpair.
*/
num_vectors_allocated = 2;
pci_release_msi(dev);
if (pci_alloc_msix(dev, &num_vectors_allocated) != 0)
panic("could not reallocate any vectors\n");
if (num_vectors_allocated != 2)
panic("could not reallocate 2 vectors\n");
}
}
/*
@ -1022,7 +1044,7 @@ nvme_ctrlr_construct(struct nvme_controller *ctrlr, device_t dev)
* vendors wishing to import this driver into kernels based on
* older versions of FreeBSD.
*/
for (i = 0; i < num_vectors; i++) {
for (i = 0; i < num_vectors_allocated; i++) {
rid = i + 1;
ctrlr->msi_res[i] = bus_alloc_resource_any(ctrlr->dev,
SYS_RES_IRQ, &rid, RF_ACTIVE);