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device: Add pciexp_find_next_extended_cap function

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Some PCIe devices have extended capability lists that contain
multiples instances of the same capability. This patch provides a
function similar to pciexp_find_extended_cap that can be used to
search through multiple instances of the same capability by returning
the offset of the next extended capability of the given type following
the passed-in offset. The base functionality of searching for a given
capability from an offset is extracted to a local helper function and
both pciexp_find_extended_cap and pciexp_find_next_extended_cap use
this helper.

Change-Id: Ie68dc26012ba57650484c4f2ff53cc694a5347aa
Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57784
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>
This commit is contained in:
Tim Wawrzynczak
2021-09-16 20:18:16 -06:00
committed by Felix Held
parent 49be1a9346
commit 3d121ae1a1
2 changed files with 23 additions and 11 deletions
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2
src/include/device/pciexp.h
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@@ -31,6 +31,8 @@ void pciexp_hotplug_scan_bridge(struct device *dev);
extern struct device_operations default_pciexp_hotplug_ops_bus;
unsigned int pciexp_find_extended_cap(const struct device *dev, unsigned int cap);
unsigned int pciexp_find_next_extended_cap(const struct device *dev, unsigned int cap,
unsigned int offset);
static inline bool pciexp_is_downstream_port(int type)
{