diff options
| author | Suneel Garapati <sgarapati@marvell.com> | 2019-10-23 18:40:36 -0700 |
|---|---|---|
| committer | Stefan Roese <sr@denx.de> | 2020-08-25 08:01:16 +0200 |
| commit | a3fac3f395afc5ad7aeb01fb7ed2d87d07c87ab0 (patch) | |
| tree | 3acf8430dfd9d1043c2c1117877353841470c1cb | |
| parent | 51eeae91c5e7b8f7c1bdf46aa6d6bb1675fd2ebc (diff) | |
pci: pci-uclass: Add support for Alternate-RoutingID capability
If ARI capability is found on device, use it to update next function
number in bus scan and also helps to skip unnecessary bdf scans.
Signed-off-by: Suneel Garapati <sgarapati@marvell.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Cc: Bin Meng <bmeng.cn@gmail.com>
| -rw-r--r-- | drivers/pci/Kconfig | 9 | ||||
| -rw-r--r-- | drivers/pci/pci-uclass.c | 26 |
2 files changed, 35 insertions, 0 deletions
diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig index 4635752a95..377806f3b0 100644 --- a/drivers/pci/Kconfig +++ b/drivers/pci/Kconfig @@ -63,6 +63,15 @@ config PCI_SRIOV if available on a PCI Physical Function device and probe for applicable drivers. +config PCI_ARID + bool "Enable Alternate Routing-ID support for PCI" + depends on PCI || DM_PCI + default n + help + Say Y here if you want to enable Alternate Routing-ID capability + support on PCI devices. This helps to skip some devices in BDF + scan that are not present. + config PCIE_ECAM_GENERIC bool "Generic ECAM-based PCI host controller support" default n diff --git a/drivers/pci/pci-uclass.c b/drivers/pci/pci-uclass.c index 23135ebe04..fc60dfe395 100644 --- a/drivers/pci/pci-uclass.c +++ b/drivers/pci/pci-uclass.c @@ -798,6 +798,7 @@ int pci_bind_bus_devices(struct udevice *bus) ulong header_type; pci_dev_t bdf, end; bool found_multi; + int ari_off; int ret; found_multi = false; @@ -871,6 +872,31 @@ int pci_bind_bus_devices(struct udevice *bus) pplat->vendor = vendor; pplat->device = device; pplat->class = class; + + if (IS_ENABLED(CONFIG_PCI_ARID)) { + ari_off = dm_pci_find_ext_capability(dev, + PCI_EXT_CAP_ID_ARI); + if (ari_off) { + u16 ari_cap; + + /* + * Read Next Function number in ARI Cap + * Register + */ + dm_pci_read_config16(dev, ari_off + 4, + &ari_cap); + /* + * Update next scan on this function number, + * subtract 1 in BDF to satisfy loop increment. + */ + if (ari_cap & 0xff00) { + bdf = PCI_BDF(PCI_BUS(bdf), + PCI_DEV(ari_cap), + PCI_FUNC(ari_cap)); + bdf = bdf - 0x100; + } + } + } } return 0; |