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| author | Tomasz Nowicki <tn@semihalf.com> | 2016-09-09 22:24:03 +0300 |
|---|---|---|
| committer | Bjorn Helgaas <helgaas@kernel.org> | 2016-12-06 22:45:48 +0300 |
| commit | 13983eb89d5afaa65acd4479fad151cbd4de5509 (patch) | |
| tree | a131313e953e8b073ba44ff33a69994d11b0abdd /drivers/acpi | |
| parent | 8fd4391ee717569d60fa283da778f7497630c9b7 (diff) | |
| download | linux-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.c | 28 |
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; } |