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pci: pci-uclass: Add support for Alternate-RoutingID capability

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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>
This commit is contained in:
Suneel Garapati 2019-10-23 18:40:36 -07:00 • committed by Stefan Roese
parent 51eeae91c5
commit a3fac3f395
2 changed files with 35 additions and 0 deletions
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9
drivers/pci/Kconfig
View file

@ -63,6 +63,15 @@ config PCI_SRIOV
if available on a PCI Physical Function device and probe for if available on a PCI Physical Function device and probe for
applicable drivers. 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 config PCIE_ECAM_GENERIC
bool "Generic ECAM-based PCI host controller support" bool "Generic ECAM-based PCI host controller support"
default n default n

26
drivers/pci/pci-uclass.c
View file

@ -798,6 +798,7 @@ int pci_bind_bus_devices(struct udevice *bus)
ulong header_type; ulong header_type;
pci_dev_t bdf, end; pci_dev_t bdf, end;
bool found_multi; bool found_multi;
int ari_off;
int ret; int ret;
found_multi = false; found_multi = false;
@ -871,6 +872,31 @@ int pci_bind_bus_devices(struct udevice *bus)
pplat->vendor = vendor; pplat->vendor = vendor;
pplat->device = device; pplat->device = device;
pplat->class = class; 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; return 0;