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arm64: PCI: Search ACPI namespace to ensure ECAM space is reserved 

The static MCFG table tells us the base of ECAM space, but it does not
reserve the space -- the reservation should be done via a device in the
ACPI namespace whose _CRS includes the ECAM region.

Use acpi_resource_consumer() to check whether the ECAM space is reserved by
an ACPI namespace device.  If it is, emit a message showing which device
reserves it.  If not, emit a "[Firmware Bug]" warning.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
This commit is contained in:
Bjorn Helgaas 2016-11-30 14:48:33 -06:00 committed by Bjorn Helgaas
parent dfd1972c2b
commit 08b1c19606
1 changed files with 11 additions and 1 deletions
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12
arch/arm64/kernel/pci.c
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@ -124,8 +124,9 @@ 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_config_window *cfg;
struct resource cfgres;
struct acpi_device *adev;
struct pci_config_window *cfg;
unsigned int bsz;
/* Use address from _CBA if present, otherwise lookup MCFG */
@ -141,6 +142,15 @@ pci_acpi_setup_ecam_mapping(struct acpi_pci_root *root)
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,
dev_name(&adev->dev));
else
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);
if (IS_ERR(cfg)) {
dev_err(dev, "%04x:%pR error %ld mapping ECAM\n", seg, bus_res,