diff options
Diffstat (limited to 'bsp/meta-arm/meta-arm-bsp/recipes-kernel/linux/linux-linaro-arm-5.4/n1sdp/0004-n1sdp-update-n1sdp-pci-quirk-for-SR-IOV-support.patch')
| -rw-r--r-- | bsp/meta-arm/meta-arm-bsp/recipes-kernel/linux/linux-linaro-arm-5.4/n1sdp/0004-n1sdp-update-n1sdp-pci-quirk-for-SR-IOV-support.patch | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/bsp/meta-arm/meta-arm-bsp/recipes-kernel/linux/linux-linaro-arm-5.4/n1sdp/0004-n1sdp-update-n1sdp-pci-quirk-for-SR-IOV-support.patch b/bsp/meta-arm/meta-arm-bsp/recipes-kernel/linux/linux-linaro-arm-5.4/n1sdp/0004-n1sdp-update-n1sdp-pci-quirk-for-SR-IOV-support.patch new file mode 100644 index 00000000..6fb2dacd --- /dev/null +++ b/bsp/meta-arm/meta-arm-bsp/recipes-kernel/linux/linux-linaro-arm-5.4/n1sdp/0004-n1sdp-update-n1sdp-pci-quirk-for-SR-IOV-support.patch @@ -0,0 +1,51 @@ +From 7bcc0412428050b0ab1fd70cbb4aaead5ac3c0e5 Mon Sep 17 00:00:00 2001 +From: Manoj Kumar <manoj.kumar3@arm.com> +Date: Wed, 29 Jan 2020 17:21:39 +0000 +Subject: [PATCH 4/4] n1sdp: update n1sdp pci quirk for SR-IOV support + +VFs are not probing the vendor ID first, which is otherwise +the gate keeper for undiscovered devices. So any accesses using +a config space offset greater than 0 must be coming for an +already discovered device or from a VF that has just been created. + +Also if Linux already has a struct pci_dev* for a given BDF, +this device is safe to access. + +Skip the firmware table in these cases and allow accesses to +those devices. That enables SR-IOV support on the N1SDP board. + +Signed-off-by: Andre Przywara <andre.przywara@arm.com> +--- + drivers/pci/controller/pcie-n1sdp.c | 9 +++++++++ + 1 file changed, 9 insertions(+) + +diff --git a/drivers/pci/controller/pcie-n1sdp.c b/drivers/pci/controller/pcie-n1sdp.c +index 620ab221466c..04c0de043817 100644 +--- a/drivers/pci/controller/pcie-n1sdp.c ++++ b/drivers/pci/controller/pcie-n1sdp.c +@@ -61,6 +61,7 @@ static void __iomem *pci_n1sdp_map_bus(struct pci_bus *bus, unsigned int devfn, + unsigned int segment = bus->domain_nr; + unsigned int bdf_addr; + unsigned int table_count, i; ++ struct pci_dev *dev; + + if (segment >= MAX_SEGMENTS || + busn < cfg->busr.start || busn > cfg->busr.end) +@@ -70,6 +71,14 @@ static void __iomem *pci_n1sdp_map_bus(struct pci_bus *bus, unsigned int devfn, + if (busn == 0 && devfn == 0) + return rc_remapped_addr[segment] + where; + ++ dev = pci_get_domain_bus_and_slot(segment, busn, devfn); ++ if (dev && dev->is_virtfn) ++ return pci_ecam_map_bus(bus, devfn, where); ++ ++ /* Accesses beyond the vendor ID always go to existing devices. */ ++ if (where > 0) ++ return pci_ecam_map_bus(bus, devfn, where); ++ + busn -= cfg->busr.start; + bdf_addr = (busn << cfg->ops->bus_shift) + (devfn << devfn_shift); + table_count = pcie_discovery_data[segment]->nr_bdfs; +-- +2.25.0 + |