diff options
| author | Dan Williams <dan.j.williams@intel.com> | 2025-10-31 14:28:55 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2025-11-03 19:27:40 -0800 |
| commit | 215afa89d249bb095126cf00f8be719e421c75e9 (patch) | |
| tree | 80a0b8264f84f08aad2155e3b47e01c3af94d124 /include/linux/device | |
| parent | f16469ee733ac52b2373216803699cbb05e82786 (diff) | |
PCI: Introduce pci_walk_bus_reverse(), for_each_pci_dev_reverse()
PCI/TSM, the PCI core functionality for the PCIe TEE Device Interface
Security Protocol (TDISP), has a need to walk all subordinate functions of
a Device Security Manager (DSM) to setup a device security context. A DSM
is physical function 0 of multi-function or SR-IOV device endpoint, or it
is an upstream switch port.
In error scenarios or when a TEE Security Manager (TSM) device is removed
it needs to unwind all established DSM contexts.
Introduce reverse versions of PCI device iteration helpers to mirror the
setup path and ensure that dependent children are handled before parents.
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Link: https://patch.msgid.link/20251031212902.2256310-4-dan.j.williams@intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'include/linux/device')
| -rw-r--r-- | include/linux/device/bus.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/device/bus.h b/include/linux/device/bus.h index f5a56efd2bd6..99b1002b3e31 100644 --- a/include/linux/device/bus.h +++ b/include/linux/device/bus.h @@ -150,6 +150,9 @@ int bus_for_each_dev(const struct bus_type *bus, struct device *start, void *data, device_iter_t fn); struct device *bus_find_device(const struct bus_type *bus, struct device *start, const void *data, device_match_t match); +struct device *bus_find_device_reverse(const struct bus_type *bus, + struct device *start, const void *data, + device_match_t match); /** * bus_find_device_by_name - device iterator for locating a particular device * of a specific name. |