ACPI spec6.1 - chapter: 5.5.2.4 defines OperationRegion (Declare Operation
Region). Following the spec: " [...] An Operation Region is a specific
region of operation within an address space that is declared as a subset
of the entire address space using a starting address (offset) and a length.
Control methods must have exclusive access to any address accessed via
fields declared in Operation Regions. [...]".
OperationRegion allows to declare various of operation region address space
identifiers including PCI_Config. PCI_Config is meant to access PCI
configuration space from the ASL. So every time ASL opcode operates
on PCI_Config space region, ASL interpreter dispatches accesses to OS
low-level calls - raw_pci_write() and raw_pci_read() for Linux - so-called
ACPI RAW accessors.
In order to support PCI_Config operation region, implement mentioned
raw_pci_write() and raw_pci_read() calls so they find associated bus
and call read/write ops.
Waiting for clarification in the ACPI specifications in relation
to PCI_Config space handling before PCI bus enumeration is completed,
current code does not support PCI_Config region accesses before PCI bus
enumeration whilst providing full AML PCI_Config access availability
when the PCI bus enumeration is completed by the kernel so that
RAW accessors can look-up PCI operations through the struct pci_bus
associated with a PCI bus.
Signed-off-by: Tomasz Nowicki <tn@xxxxxxxxxxxx>
Signed-off-by: Jayachandran C <jchandra@xxxxxxxxxxxx>
---
arch/arm64/kernel/pci.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
index b3b8a2c..328f857 100644
--- a/arch/arm64/kernel/pci.c
+++ b/arch/arm64/kernel/pci.c
@@ -71,13 +71,21 @@ int pcibios_alloc_irq(struct pci_dev *dev)
int raw_pci_read(unsigned int domain, unsigned int bus,
unsigned int devfn, int reg, int len, u32 *val)
{
- return -ENXIO;
+ struct pci_bus *b = pci_find_bus(domain, bus);
+
+ if (!b)
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ return b->ops->read(b, devfn, reg, len, val);
}
int raw_pci_write(unsigned int domain, unsigned int bus,
unsigned int devfn, int reg, int len, u32 val)
{
- return -ENXIO;
+ struct pci_bus *b = pci_find_bus(domain, bus);
+
+ if (!b)
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ return b->ops->write(b, devfn, reg, len, val);
}
#ifdef CONFIG_NUMA
--
1.9.1
--
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