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| author | Dimitri Sivanich <sivanich@hpe.com> | 2024-04-24 15:16:29 +0800 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2024-04-26 11:57:36 +0200 |
| commit | d74169ceb0d2e32438946a2f1f9fc8c803304bd6 (patch) | |
| tree | 3c9e7d3d50d317c44291f01c5779f1ec0fab0b08 /drivers/iommu/intel/dmar.c | |
| parent | 9e7ee0f045395dc8aa55fbdc164c062484f4c88d (diff) | |
| download | linux-d74169ceb0d2e32438946a2f1f9fc8c803304bd6.tar.gz linux-d74169ceb0d2e32438946a2f1f9fc8c803304bd6.tar.bz2 linux-d74169ceb0d2e32438946a2f1f9fc8c803304bd6.zip | |
iommu/vt-d: Allocate DMAR fault interrupts locally
The Intel IOMMU code currently tries to allocate all DMAR fault interrupt
vectors on the boot cpu. On large systems with high DMAR counts this
results in vector exhaustion, and most of the vectors are not initially
allocated socket local.
Instead, have a cpu on each node do the vector allocation for the DMARs on
that node. The boot cpu still does the allocation for its node during its
boot sequence.
Signed-off-by: Dimitri Sivanich <sivanich@hpe.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/Zfydpp2Hm+as16TY@hpe.com
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/intel/dmar.c')
| -rw-r--r-- | drivers/iommu/intel/dmar.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/iommu/intel/dmar.c b/drivers/iommu/intel/dmar.c index 351be9455214..932e0c10c0fe 100644 --- a/drivers/iommu/intel/dmar.c +++ b/drivers/iommu/intel/dmar.c @@ -2121,7 +2121,7 @@ int dmar_set_interrupt(struct intel_iommu *iommu) return ret; } -int __init enable_drhd_fault_handling(void) +int enable_drhd_fault_handling(unsigned int cpu) { struct dmar_drhd_unit *drhd; struct intel_iommu *iommu; @@ -2131,7 +2131,12 @@ int __init enable_drhd_fault_handling(void) */ for_each_iommu(iommu, drhd) { u32 fault_status; - int ret = dmar_set_interrupt(iommu); + int ret; + + if (iommu->irq || iommu->node != cpu_to_node(cpu)) + continue; + + ret = dmar_set_interrupt(iommu); if (ret) { pr_err("DRHD %Lx: failed to enable fault, interrupt, ret %d\n", |