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authorTomasz Nowicki <tn@semihalf.com>2016-09-09 22:24:03 +0300
committerBjorn Helgaas <helgaas@kernel.org>2016-12-06 22:45:48 +0300
commit13983eb89d5afaa65acd4479fad151cbd4de5509 (patch)
treea131313e953e8b073ba44ff33a69994d11b0abdd /drivers/acpi
parent8fd4391ee717569d60fa283da778f7497630c9b7 (diff)
downloadlinux-13983eb89d5afaa65acd4479fad151cbd4de5509.tar.xz
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>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/pci_mcfg.c28
1 files changed, 25 insertions, 3 deletions
diff --git a/drivers/acpi/pci_mcfg.c b/drivers/acpi/pci_mcfg.c
index b5b376e081f5..ffcc6513e851 100644
--- a/drivers/acpi/pci_mcfg.c
+++ b/drivers/acpi/pci_mcfg.c
@@ -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;
}