diff options
Diffstat (limited to 'debian/patches/bugfix/all/PCI-ACPI-Evaluate-PCI-Boot-Configuration-_DSM.patch')
| -rw-r--r-- | debian/patches/bugfix/all/PCI-ACPI-Evaluate-PCI-Boot-Configuration-_DSM.patch | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/debian/patches/bugfix/all/PCI-ACPI-Evaluate-PCI-Boot-Configuration-_DSM.patch b/debian/patches/bugfix/all/PCI-ACPI-Evaluate-PCI-Boot-Configuration-_DSM.patch new file mode 100644 index 000000000..2172fa43d --- /dev/null +++ b/debian/patches/bugfix/all/PCI-ACPI-Evaluate-PCI-Boot-Configuration-_DSM.patch @@ -0,0 +1,80 @@ +From: Benjamin Herrenschmidt <benh@kernel.crashing.org> +Date: Sat, 15 Jun 2019 10:23:57 +1000 +Subject: [PATCH 1/4] PCI/ACPI: Evaluate PCI Boot Configuration _DSM +Origin: https://git.kernel.org/linus/a78cf9657ba5426f54aa93a067c10d097944c082 + +Evaluate _DSM Function #5, the "PCI Boot Configuration" function. If the +result is 0, the OS should preserve any resource assignments made by the +firmware. + +Link: https://lore.kernel.org/r/20190615002359.29577-2-benh@kernel.crashing.org +Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> +[bhelgaas: commit log] +Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> +--- + drivers/acpi/pci_root.c | 12 ++++++++++++ + include/linux/pci-acpi.h | 7 ++++--- + include/linux/pci.h | 2 ++ + 3 files changed, 18 insertions(+), 3 deletions(-) + +Index: linux/drivers/acpi/pci_root.c +=================================================================== +--- linux.orig/drivers/acpi/pci_root.c ++++ linux/drivers/acpi/pci_root.c +@@ -884,6 +884,7 @@ struct pci_bus *acpi_pci_root_create(str + int node = acpi_get_node(device->handle); + struct pci_bus *bus; + struct pci_host_bridge *host_bridge; ++ union acpi_object *obj; + + info->root = root; + info->bridge = device; +@@ -920,6 +921,17 @@ struct pci_bus *acpi_pci_root_create(str + if (!(root->osc_control_set & OSC_PCI_EXPRESS_LTR_CONTROL)) + host_bridge->native_ltr = 0; + ++ /* ++ * Evaluate the "PCI Boot Configuration" _DSM Function. If it ++ * exists and returns 0, we must preserve any PCI resource ++ * assignments made by firmware for this host bridge. ++ */ ++ obj = acpi_evaluate_dsm(ACPI_HANDLE(bus->bridge), &pci_acpi_dsm_guid, 1, ++ IGNORE_PCI_BOOT_CONFIG_DSM, NULL); ++ if (obj && obj->type == ACPI_TYPE_INTEGER && obj->integer.value == 0) ++ host_bridge->preserve_config = 1; ++ ACPI_FREE(obj); ++ + pci_scan_child_bus(bus); + pci_set_host_bridge_release(host_bridge, acpi_pci_root_release_info, + info); +Index: linux/include/linux/pci-acpi.h +=================================================================== +--- linux.orig/include/linux/pci-acpi.h ++++ linux/include/linux/pci-acpi.h +@@ -107,9 +107,10 @@ static inline void acpiphp_check_host_br + #endif + + extern const guid_t pci_acpi_dsm_guid; +-#define DEVICE_LABEL_DSM 0x07 +-#define RESET_DELAY_DSM 0x08 +-#define FUNCTION_DELAY_DSM 0x09 ++#define IGNORE_PCI_BOOT_CONFIG_DSM 0x05 ++#define DEVICE_LABEL_DSM 0x07 ++#define RESET_DELAY_DSM 0x08 ++#define FUNCTION_DELAY_DSM 0x09 + + #else /* CONFIG_ACPI */ + static inline void acpi_pci_add_bus(struct pci_bus *bus) { } +Index: linux/include/linux/pci.h +=================================================================== +--- linux.orig/include/linux/pci.h ++++ linux/include/linux/pci.h +@@ -486,6 +486,8 @@ struct pci_host_bridge { + unsigned int native_shpc_hotplug:1; /* OS may use SHPC hotplug */ + unsigned int native_pme:1; /* OS may use PCIe PME */ + unsigned int native_ltr:1; /* OS may use PCIe LTR */ ++ unsigned int preserve_config:1; /* Preserve FW resource setup */ ++ + /* Resource alignment requirements */ + resource_size_t (*align_resource)(struct pci_dev *dev, + const struct resource *res, |