github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-24 07:03:03 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

iommu/amd: Add NUMA node affinity for IOMMU log buffers

Browse Source 
Currently, PPR Log and GA logs for AMD IOMMU are allocated using
iommu_alloc_pages_sz(), which does not account for NUMA affinity. This can
lead to remote memory access latencies if the memory is allocated on a
different node than the IOMMU hardware.

Switch to iommu_alloc_pages_node_sz() to ensure that these data structures
are allocated on the same NUMA node as the IOMMU device. If the node
information is unavailable, it defaults to NUMA_NO_NODE.

Signed-off-by: Li RongQing <lirongqing@baidu.com>
Reviewed-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Ankit Soni <Ankit.Soni@amd.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Li RongQing 2026-02-10 22:58:39 -05:00 committed by Joerg Roedel
parent f338e77383
commit 1e0c8d6b69
1 changed files with 6 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/iommu/amd/init.c
View File

@ -848,10 +848,11 @@ static void __init free_command_buffer(struct amd_iommu *iommu)
void *__init iommu_alloc_4k_pages(struct amd_iommu *iommu, gfp_t gfp,
size_t size)
{
int nid = iommu->dev ? dev_to_node(&iommu->dev->dev) : NUMA_NO_NODE;
void *buf;
size = PAGE_ALIGN(size);
buf = iommu_alloc_pages_sz(gfp, size);
buf = iommu_alloc_pages_node_sz(nid, gfp, size);
if (!buf)
return NULL;
if (check_feature(FEATURE_SNP) &&
@ -954,14 +955,16 @@ static int iommu_ga_log_enable(struct amd_iommu *iommu)
static int iommu_init_ga_log(struct amd_iommu *iommu)
{
int nid = iommu->dev ? dev_to_node(&iommu->dev->dev) : NUMA_NO_NODE;
if (!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir))
return 0;
iommu->ga_log = iommu_alloc_pages_sz(GFP_KERNEL, GA_LOG_SIZE);
iommu->ga_log = iommu_alloc_pages_node_sz(nid, GFP_KERNEL, GA_LOG_SIZE);
if (!iommu->ga_log)
goto err_out;
iommu->ga_log_tail = iommu_alloc_pages_sz(GFP_KERNEL, 8);
iommu->ga_log_tail = iommu_alloc_pages_node_sz(nid, GFP_KERNEL, 8);
if (!iommu->ga_log_tail)
goto err_out;