diff options
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/pci/p2pdma.c | 31 |
1 files changed, 20 insertions, 11 deletions
diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index f7f7e5862bab..4b9f0903b340 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -269,19 +269,11 @@ static void seq_buf_print_bus_devfn(struct seq_buf *buf, struct pci_dev *pdev) seq_buf_printf(buf, "%s;", pci_name(pdev)); } -/* - * If we can't find a common upstream bridge take a look at the root - * complex and compare it to a whitelist of known good hardware. - */ -static bool root_complex_whitelist(struct pci_dev *dev) +static bool __host_bridge_whitelist(struct pci_host_bridge *host) { - struct pci_host_bridge *host = pci_find_host_bridge(dev->bus); struct pci_dev *root = pci_get_slot(host->bus, PCI_DEVFN(0, 0)); unsigned short vendor, device; - if (iommu_present(dev->dev.bus)) - return false; - if (!root) return false; @@ -296,6 +288,24 @@ static bool root_complex_whitelist(struct pci_dev *dev) return false; } +/* + * If we can't find a common upstream bridge take a look at the root + * complex and compare it to a whitelist of known good hardware. + */ +static bool host_bridge_whitelist(struct pci_dev *a, struct pci_dev *b) +{ + struct pci_host_bridge *host_a = pci_find_host_bridge(a->bus); + struct pci_host_bridge *host_b = pci_find_host_bridge(b->bus); + + if (iommu_present(a->dev.bus) || iommu_present(b->dev.bus)) + return false; + + if (__host_bridge_whitelist(host_a) && __host_bridge_whitelist(host_b)) + return true; + + return false; +} + static enum pci_p2pdma_map_type __upstream_bridge_distance(struct pci_dev *provider, struct pci_dev *client, int *dist, bool *acs_redirects, struct seq_buf *acs_list) @@ -418,8 +428,7 @@ upstream_bridge_distance(struct pci_dev *provider, struct pci_dev *client, acs_redirects, acs_list); if (map_type == PCI_P2PDMA_MAP_THRU_HOST_BRIDGE) { - if (!root_complex_whitelist(provider) || - !root_complex_whitelist(client)) + if (!host_bridge_whitelist(provider, client)) return PCI_P2PDMA_MAP_NOT_SUPPORTED; } |