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| author | Kyösti Mälkki <kyosti.malkki@gmail.com> | 2019-07-03 09:55:01 +0300 |
|---|---|---|
| committer | Kyösti Mälkki <kyosti.malkki@gmail.com> | 2019-07-07 20:04:44 +0000 |
| commit | fffc9f3b9d9de4909d35da0fb4006d5080bb8e27 (patch) | |
| tree | 60d035cfc4dfbcf7f5bdec4d47b560265e09316b /src/device/device_const.c | |
| parent | b72b5d95286a2290554399e0803d4ba5e7b87f8d (diff) | |
| download | coreboot-fffc9f3b9d9de4909d35da0fb4006d5080bb8e27.tar.xz | |
device/pci: Declare pci_root_bus()
This is used a lot, cache the result so search
of domain from devicetree is only done once.
Improvement only applies when MAYBE_STATIC evaluates
to static.
Change-Id: If675abb632fe68acd59ba0bdfef854da3e0839a9
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34004
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Diffstat (limited to 'src/device/device_const.c')
| -rw-r--r-- | src/device/device_const.c | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/src/device/device_const.c b/src/device/device_const.c index 6ce1d18c93..1853b4c4d2 100644 --- a/src/device/device_const.c +++ b/src/device/device_const.c @@ -183,10 +183,24 @@ DEVTREE_CONST struct device *pcidev_path_behind( return find_dev_path(parent, &path); } -DEVTREE_CONST struct device *pcidev_path_on_root(pci_devfn_t devfn) +DEVTREE_CONST struct bus *pci_root_bus(void) { DEVTREE_CONST struct device *pci_domain; + MAYBE_STATIC DEVTREE_CONST struct bus *pci_root = NULL; + + if (pci_root) + return pci_root; + + pci_domain = dev_find_path(NULL, DEVICE_PATH_DOMAIN); + if (!pci_domain) + return NULL; + + pci_root = pci_domain->link_list; + return pci_root; +} +DEVTREE_CONST struct device *pcidev_path_on_root(pci_devfn_t devfn) +{ /* Work around pcidev_path_behind() below failing * due tue complicated devicetree with topology * being manipulated on-the-fly. @@ -194,11 +208,7 @@ DEVTREE_CONST struct device *pcidev_path_on_root(pci_devfn_t devfn) if (CONFIG(NORTHBRIDGE_AMD_AMDFAM10)) return dev_find_slot(0, devfn); - pci_domain = dev_find_path(NULL, DEVICE_PATH_DOMAIN); - if (!pci_domain) - return NULL; - - return pcidev_path_behind(pci_domain->link_list, devfn); + return pcidev_path_behind(pci_root_bus(), devfn); } DEVTREE_CONST struct device *pcidev_on_root(uint8_t dev, uint8_t fn) |