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authorBjorn Helgaas <bhelgaas@google.com>2020-08-05 18:24:17 -0500
committerBjorn Helgaas <bhelgaas@google.com>2020-08-05 18:24:17 -0500
commit4f7adb6ee74ccb1c745eec17e5ce89cfd09cd1e9 (patch)
tree70ca15c49049fd6e778a36e28fb7f20e9f4f1921 /drivers/pci/p2pdma.c
parentd697552f52f31f3b46050522c2e93f5c3aed3046 (diff)
parentdea286bb71baded7d2fb4f090e3b9fd2c1ccac58 (diff)
Merge branch 'pci/peer-to-peer'
- Allow P2PDMA on AMD Zen and newer CPUs (Logan Gunthorpe) * pci/peer-to-peer: PCI/P2PDMA: Allow P2PDMA on AMD Zen and newer CPUs
Diffstat (limited to 'drivers/pci/p2pdma.c')
-rw-r--r--drivers/pci/p2pdma.c21
1 files changed, 15 insertions, 6 deletions
diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c
index f29a48f8fa59..64ebed129dbf 100644
--- a/drivers/pci/p2pdma.c
+++ b/drivers/pci/p2pdma.c
@@ -273,6 +273,19 @@ static void seq_buf_print_bus_devfn(struct seq_buf *buf, struct pci_dev *pdev)
seq_buf_printf(buf, "%s;", pci_name(pdev));
}
+static bool cpu_supports_p2pdma(void)
+{
+#ifdef CONFIG_X86
+ struct cpuinfo_x86 *c = &cpu_data(0);
+
+ /* Any AMD CPU whose family ID is Zen or newer supports p2pdma */
+ if (c->x86_vendor == X86_VENDOR_AMD && c->x86 >= 0x17)
+ return true;
+#endif
+
+ return false;
+}
+
static const struct pci_p2pdma_whitelist_entry {
unsigned short vendor;
unsigned short device;
@@ -280,11 +293,6 @@ static const struct pci_p2pdma_whitelist_entry {
REQ_SAME_HOST_BRIDGE = 1 << 0,
} flags;
} pci_p2pdma_whitelist[] = {
- /* AMD ZEN */
- {PCI_VENDOR_ID_AMD, 0x1450, 0},
- {PCI_VENDOR_ID_AMD, 0x15d0, 0},
- {PCI_VENDOR_ID_AMD, 0x1630, 0},
-
/* Intel Xeon E5/Core i7 */
{PCI_VENDOR_ID_INTEL, 0x3c00, REQ_SAME_HOST_BRIDGE},
{PCI_VENDOR_ID_INTEL, 0x3c01, REQ_SAME_HOST_BRIDGE},
@@ -473,7 +481,8 @@ 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 (!host_bridge_whitelist(provider, client))
+ if (!cpu_supports_p2pdma() &&
+ !host_bridge_whitelist(provider, client))
map_type = PCI_P2PDMA_MAP_NOT_SUPPORTED;
}