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PCI/P2PDMA: Allow wildcard Device IDs in host bridge list 

Currently, the pci_p2pdma_whitelist array requires an exact match for both
Vendor and Device ID. Some hardware vendors support cross bridge
peer-to-peer DMA across their entire silicon lineup, so add support for
wildcard device IDs to avoid the need to continuously update this array.

Signed-off-by: Jacob Moroni <jmoroni@google.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Link: https://patch.msgid.link/20260409150123.3538444-1-jmoroni@google.com
master
Jacob Moroni 2026-04-09 15:01:22 +00:00 committed by Bjorn Helgaas
parent 6de23f81a5
commit 1a1f96e3e2
1 changed files with 6 additions and 2 deletions
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8
drivers/pci/p2pdma.c
View File

@ -530,7 +530,7 @@ static bool cpu_supports_p2pdma(void)
static const struct pci_p2pdma_whitelist_entry {
unsigned short vendor;
unsigned short device;
int device;
enum {
REQ_SAME_HOST_BRIDGE = 1 << 0,
} flags;
@ -601,8 +601,12 @@ static bool __host_bridge_whitelist(struct pci_host_bridge *host,
device = root->device;
for (entry = pci_p2pdma_whitelist; entry->vendor; entry++) {
if (vendor != entry->vendor || device != entry->device)
if (vendor != entry->vendor)
continue;
if (entry->device != PCI_ANY_ID && device != entry->device)
continue;
if (entry->flags & REQ_SAME_HOST_BRIDGE && !same_host_bridge)
return false;