{"id":2227526,"url":"http://patchwork.ozlabs.org/api/patches/2227526/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-pci/patch/20260423212316.3431746-10-dmatlack@google.com/","project":{"id":28,"url":"http://patchwork.ozlabs.org/api/projects/28/?format=json","name":"Linux PCI development","link_name":"linux-pci","list_id":"linux-pci.vger.kernel.org","list_email":"linux-pci@vger.kernel.org","web_url":null,"scm_url":null,"webscm_url":null,"list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20260423212316.3431746-10-dmatlack@google.com>","list_archive_url":null,"date":"2026-04-23T21:23:13","name":"[v4,09/11] PCI: liveupdate: Inherit ARI Forwarding Enable on preserved bridges","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"913aa91e7a503dae4843d07aaeb87441e7bb689f","submitter":{"id":69449,"url":"http://patchwork.ozlabs.org/api/people/69449/?format=json","name":"David Matlack","email":"dmatlack@google.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-pci/patch/20260423212316.3431746-10-dmatlack@google.com/mbox/","series":[{"id":501248,"url":"http://patchwork.ozlabs.org/api/series/501248/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-pci/list/?series=501248","date":"2026-04-23T21:23:04","name":"PCI: liveupdate: PCI core support for Live Update","version":4,"mbox":"http://patchwork.ozlabs.org/series/501248/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2227526/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2227526/checks/","tags":{},"related":[],"headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-pci@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=google.com header.i=@google.com header.a=rsa-sha256\n header.s=20251104 header.b=WftHepeb;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c04:e001:36c::12fc:5321; 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charset=\"UTF-8\""},"content":"Inherit the ARI Forwarding Enable on preserved bridges and update\npci_dev->ari_enabled accordingly during a Live Update. This ensures that\nthe preserved devices on the bridge's secondary bus can be identified\nwith the same expanded 8-bit function number after a Live Update.\n\nSigned-off-by: David Matlack \n---\n drivers/pci/liveupdate.c | 4 ++++\n drivers/pci/pci.c | 12 +++++++++++-\n 2 files changed, 15 insertions(+), 1 deletion(-)","diff":"diff --git a/drivers/pci/liveupdate.c b/drivers/pci/liveupdate.c\nindex 54a90ff02bdd..25c86cd4c173 100644\n--- a/drivers/pci/liveupdate.c\n+++ b/drivers/pci/liveupdate.c\n@@ -128,6 +128,10 @@\n * * The PCI core inherits all ACS flags enabled on incoming preserved devices\n * rather than assigning new ones. This ensures that TLPs are routed the same\n * way after Live Update and ensures that IOMMU groups do not change.\n+ *\n+ * * The PCI core inherits ARI Forwarding Enable on all bridges with downstream\n+ * preserved devices to ensure that all preserved devices on the bridge's\n+ * secondary bus are addressable after the Live Update.\n */\n \n #define pr_fmt(fmt) \"PCI: liveupdate: \" fmt\ndiff --git a/drivers/pci/pci.c b/drivers/pci/pci.c\nindex e615b7c3e430..b45539c55c7d 100644\n--- a/drivers/pci/pci.c\n+++ b/drivers/pci/pci.c\n@@ -3498,8 +3498,9 @@ void pci_configure_ari(struct pci_dev *dev)\n {\n \tu32 cap;\n \tstruct pci_dev *bridge;\n+\tu16 val = 0;\n \n-\tif (pcie_ari_disabled || !pci_is_pcie(dev) || dev->devfn)\n+\tif (!pci_is_pcie(dev) || dev->devfn)\n \t\treturn;\n \n \tbridge = dev->bus->self;\n@@ -3510,6 +3511,15 @@ void pci_configure_ari(struct pci_dev *dev)\n \tif (!(cap & PCI_EXP_DEVCAP2_ARI))\n \t\treturn;\n \n+\tif (pci_liveupdate_incoming(bridge)) {\n+\t\tpcie_capability_read_word(bridge, PCI_EXP_DEVCTL2, &val);\n+\t\tbridge->ari_enabled = !!(val & PCI_EXP_DEVCTL2_ARI);\n+\t\treturn;\n+\t}\n+\n+\tif (pcie_ari_disabled)\n+\t\treturn;\n+\n \tif (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ARI)) {\n \t\tpcie_capability_set_word(bridge, PCI_EXP_DEVCTL2,\n \t\t\t\t\t PCI_EXP_DEVCTL2_ARI);\n","prefixes":["v4","09/11"]}