diff options
Diffstat (limited to 'drivers/pci/p2pdma.c')
-rw-r--r-- | drivers/pci/p2pdma.c | 33 |
1 files changed, 22 insertions, 11 deletions
diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index e8e444eeb1cd..f357f9a32b3a 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -253,7 +253,7 @@ static int pci_bridge_has_acs_redir(struct pci_dev *pdev) int pos; u16 ctrl; - pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ACS); + pos = pdev->acs_cap; if (!pos) return 0; @@ -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; } @@ -547,13 +556,14 @@ int pci_p2pdma_distance_many(struct pci_dev *provider, struct device **clients, return -1; for (i = 0; i < num_clients; i++) { - if (IS_ENABLED(CONFIG_DMA_VIRT_OPS) && - clients[i]->dma_ops == &dma_virt_ops) { +#ifdef CONFIG_DMA_VIRT_OPS + if (clients[i]->dma_ops == &dma_virt_ops) { if (verbose) dev_warn(clients[i], "cannot be used for peer-to-peer DMA because the driver makes use of dma_virt_ops\n"); return -1; } +#endif pci_client = find_parent_pci_dev(clients[i]); if (!pci_client) { @@ -833,9 +843,10 @@ static int __pci_p2pdma_map_sg(struct pci_p2pdma_pagemap *p2p_pgmap, * this should never happen because it will be prevented * by the check in pci_p2pdma_distance_many() */ - if (WARN_ON_ONCE(IS_ENABLED(CONFIG_DMA_VIRT_OPS) && - dev->dma_ops == &dma_virt_ops)) +#ifdef CONFIG_DMA_VIRT_OPS + if (WARN_ON_ONCE(dev->dma_ops == &dma_virt_ops)) return 0; +#endif for_each_sg(sg, s, nents, i) { paddr = sg_phys(s); |