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PCI/ACPI: Extend pci_mcfg_lookup() to return ECAM config accessors 

pci_mcfg_lookup() is the external interface to the generic MCFG code.
Previously it merely looked up the ECAM base address for a given domain and
bus range.  We want a way to add MCFG quirks, some of which may require
special config accessors and adjustments to the ECAM address range.

Extend pci_mcfg_lookup() so it can return a pointer to a pci_ecam_ops
structure and a struct resource for the ECAM address space.  For now, it
always returns &pci_generic_ecam_ops (the standard accessor) and the
resource described by the MCFG.

No functional changes intended.

[bhelgaas: changelog]
Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Tomasz Nowicki 2016-09-09 21:24:03 +02:00 committed by Bjorn Helgaas
parent 8fd4391ee7
commit 13983eb89d
3 changed files with 33 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
arch/arm64/kernel/pci.c
View File

@ -137,25 +137,18 @@ pci_acpi_setup_ecam_mapping(struct acpi_pci_root *root)
struct device *dev = &root->device->dev;
struct resource *bus_res = &root->secondary;
u16 seg = root->segment;
struct pci_ecam_ops *ecam_ops;
struct resource cfgres;
struct acpi_device *adev;
struct pci_config_window *cfg;
unsigned int bsz;
int ret;
/* Use address from _CBA if present, otherwise lookup MCFG */
if (!root->mcfg_addr)
root->mcfg_addr = pci_mcfg_lookup(seg, bus_res);
if (!root->mcfg_addr) {
ret = pci_mcfg_lookup(root, &cfgres, &ecam_ops);
if (ret) {
dev_err(dev, "%04x:%pR ECAM region not found\n", seg, bus_res);
return NULL;
}
bsz = 1 << pci_generic_ecam_ops.bus_shift;
cfgres.start = root->mcfg_addr + bus_res->start * bsz;
cfgres.end = cfgres.start + resource_size(bus_res) * bsz - 1;
cfgres.flags = IORESOURCE_MEM;
adev = acpi_resource_consumer(&cfgres);
if (adev)
dev_info(dev, "ECAM area %pR reserved by %s\n", &cfgres,
@ -164,7 +157,7 @@ pci_acpi_setup_ecam_mapping(struct acpi_pci_root *root)
dev_warn(dev, FW_BUG "ECAM area %pR not reserved in ACPI namespace\n",
&cfgres);
cfg = pci_ecam_create(dev, &cfgres, bus_res, &pci_generic_ecam_ops);
cfg = pci_ecam_create(dev, &cfgres, bus_res, ecam_ops);
if (IS_ERR(cfg)) {
dev_err(dev, "%04x:%pR error %ld mapping ECAM\n", seg, bus_res,
PTR_ERR(cfg));

28
drivers/acpi/pci_mcfg.c
View File

@ -22,6 +22,7 @@
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/pci-acpi.h>
#include <linux/pci-ecam.h>
/* Structure to hold entries from the MCFG table */
struct mcfg_entry {
@ -35,9 +36,18 @@ struct mcfg_entry {
/* List to save MCFG entries */
static LIST_HEAD(pci_mcfg_list);
phys_addr_t pci_mcfg_lookup(u16 seg, struct resource *bus_res)
int pci_mcfg_lookup(struct acpi_pci_root *root, struct resource *cfgres,
struct pci_ecam_ops **ecam_ops)
{
struct pci_ecam_ops *ops = &pci_generic_ecam_ops;
struct resource *bus_res = &root->secondary;
u16 seg = root->segment;
struct mcfg_entry *e;
struct resource res;
/* Use address from _CBA if present, otherwise lookup MCFG */
if (root->mcfg_addr)
goto skip_lookup;
/*
* We expect exact match, unless MCFG entry end bus covers more than
@ -45,10 +55,22 @@ phys_addr_t pci_mcfg_lookup(u16 seg, struct resource *bus_res)
*/
list_for_each_entry(e, &pci_mcfg_list, list) {
if (e->segment == seg && e->bus_start == bus_res->start &&
e->bus_end >= bus_res->end)
return e->addr;
e->bus_end >= bus_res->end) {
root->mcfg_addr = e->addr;
}
}
if (!root->mcfg_addr)
return -ENXIO;
skip_lookup:
memset(&res, 0, sizeof(res));
res.start = root->mcfg_addr + (bus_res->start << 20);
res.end = res.start + (resource_size(bus_res) << 20) - 1;
res.flags = IORESOURCE_MEM;
*cfgres = res;
*ecam_ops = ops;
return 0;
}

4
include/linux/pci-acpi.h
View File

@ -24,7 +24,9 @@ static inline acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev)
}
extern phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle);
extern phys_addr_t pci_mcfg_lookup(u16 domain, struct resource *bus_res);
struct pci_ecam_ops;
extern int pci_mcfg_lookup(struct acpi_pci_root *root, struct resource *cfgres,
struct pci_ecam_ops **ecam_ops);
static inline acpi_handle acpi_find_root_bridge_handle(struct pci_dev *pdev)
{