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Create pcib_request_feature.

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pcib_request_feature allows drivers to request the firmware (ACPI)
release certain features it may be using. ACPI normally manages things
like hot plug, advanced error reporting and other features until the
OS requests ACPI to relenquish control since it is taking over.

Sponsored by: Netflix
This commit is contained in:
imp 2017-02-25 06:11:36 +00:00
parent d6d1c213b7
commit 193f39e78b
3 changed files with 38 additions and 0 deletions
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5
sys/dev/pci/pci_if.m
View File

@ -60,6 +60,11 @@ HEADER {
PCI_ID_RID,
PCI_ID_MSI,
};
enum pci_feature {
PCI_FEATURE_HP, /* Hot Plug feature */
PCI_FEATURE_AER, /* Advanced Error Reporting */
};
}

24
sys/dev/pci/pci_pci.c
View File

@ -76,6 +76,8 @@ static void pcib_pcie_ab_timeout(void *arg);
static void pcib_pcie_cc_timeout(void *arg);
static void pcib_pcie_dll_timeout(void *arg);
#endif
static int pcib_request_feature(device_t pcib, device_t dev,
enum pci_feature feature);
static device_method_t pcib_methods[] = {
/* Device interface */
@ -119,6 +121,7 @@ static device_method_t pcib_methods[] = {
DEVMETHOD(pcib_try_enable_ari, pcib_try_enable_ari),
DEVMETHOD(pcib_ari_enabled, pcib_ari_enabled),
DEVMETHOD(pcib_decode_rid, pcib_ari_decode_rid),
DEVMETHOD(pcib_request_feature, pcib_request_feature),
DEVMETHOD_END
};
@ -2829,3 +2832,24 @@ pcib_try_enable_ari(device_t pcib, device_t dev)
return (0);
}
/*
* Pass the request to use this PCI feature up the tree. Either there's a
* firmware like ACPI that's using this feature that will approve (or deny) the
* request to take it over, or the platform has no such firmware, in which case
* the request will be approved. If the request is approved, the OS is expected
* to make use of the feature or render it harmless.
*/
static int
pcib_request_feature(device_t pcib, device_t dev, enum pci_feature feature)
{
device_t bus;
/*
* Our parent is necessarily a pci bus. Its parent will either be
* another pci bridge (which passes it up) or a host bridge that can
* approve or reject the request.
*/
bus = device_get_parent(pcib);
return (PCIB_REQUEST_FEATURE(device_get_parent(bus), dev, feature));
}

9
sys/dev/pci/pcib_if.m
View File

@ -212,3 +212,12 @@ METHOD void decode_rid {
int *slot;
int *func;
} DEFAULT pcib_decode_rid;
#
# Request control of PCI features from host firmware, if any.
#
METHOD int request_feature {
device_t pcib;
device_t dev;
enum pci_feature feature;
};