X-Git-Url: http://pileus.org/git/?a=blobdiff_plain;f=drivers%2Facpi%2Fpci_root.c;h=924ad92852c1a7fa69ea26f0ac8c2aaeb9d254fd;hb=645e40f9c4c7b905843e4a8968e1136ee34e0206;hp=d3874f4256534d06aeb0fdb9f364e5f5851963f3;hpb=833ae40b517a99e05fc4aea399e71f633f3348d2;p=~andy%2Flinux diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c index d3874f42565..924ad92852c 100644 --- a/drivers/acpi/pci_root.c +++ b/drivers/acpi/pci_root.c @@ -49,10 +49,10 @@ static int acpi_pci_root_add(struct acpi_device *device, const struct acpi_device_id *not_used); static void acpi_pci_root_remove(struct acpi_device *device); -#define ACPI_PCIE_REQ_SUPPORT (OSC_EXT_PCI_CONFIG_SUPPORT \ - | OSC_ACTIVE_STATE_PWR_SUPPORT \ - | OSC_CLOCK_PWR_CAPABILITY_SUPPORT \ - | OSC_MSI_SUPPORT) +#define ACPI_PCIE_REQ_SUPPORT (OSC_PCI_EXT_CONFIG_SUPPORT \ + | OSC_PCI_ASPM_SUPPORT \ + | OSC_PCI_CLOCK_PM_SUPPORT \ + | OSC_PCI_MSI_SUPPORT) static const struct acpi_device_id root_device_ids[] = { {"PNP0A03", 0}, @@ -127,6 +127,55 @@ static acpi_status try_get_root_bridge_busnr(acpi_handle handle, return AE_OK; } +struct pci_osc_bit_struct { + u32 bit; + char *desc; +}; + +static struct pci_osc_bit_struct pci_osc_support_bit[] = { + { OSC_PCI_EXT_CONFIG_SUPPORT, "ExtendedConfig" }, + { OSC_PCI_ASPM_SUPPORT, "ASPM" }, + { OSC_PCI_CLOCK_PM_SUPPORT, "ClockPM" }, + { OSC_PCI_SEGMENT_GROUPS_SUPPORT, "Segments" }, + { OSC_PCI_MSI_SUPPORT, "MSI" }, +}; + +static struct pci_osc_bit_struct pci_osc_control_bit[] = { + { OSC_PCI_EXPRESS_NATIVE_HP_CONTROL, "PCIeHotplug" }, + { OSC_PCI_SHPC_NATIVE_HP_CONTROL, "SHPCHotplug" }, + { OSC_PCI_EXPRESS_PME_CONTROL, "PME" }, + { OSC_PCI_EXPRESS_AER_CONTROL, "AER" }, + { OSC_PCI_EXPRESS_CAPABILITY_CONTROL, "PCIeCapability" }, +}; + +static void decode_osc_bits(struct acpi_pci_root *root, char *msg, u32 word, + struct pci_osc_bit_struct *table, int size) +{ + char buf[80]; + int i, len = 0; + struct pci_osc_bit_struct *entry; + + buf[0] = '\0'; + for (i = 0, entry = table; i < size; i++, entry++) + if (word & entry->bit) + len += snprintf(buf + len, sizeof(buf) - len, "%s%s", + len ? " " : "", entry->desc); + + dev_info(&root->device->dev, "_OSC: %s [%s]\n", msg, buf); +} + +static void decode_osc_support(struct acpi_pci_root *root, char *msg, u32 word) +{ + decode_osc_bits(root, msg, word, pci_osc_support_bit, + ARRAY_SIZE(pci_osc_support_bit)); +} + +static void decode_osc_control(struct acpi_pci_root *root, char *msg, u32 word) +{ + decode_osc_bits(root, msg, word, pci_osc_control_bit, + ARRAY_SIZE(pci_osc_control_bit)); +} + static u8 pci_osc_uuid_str[] = "33DB4D5B-1FF7-401C-9657-7441C03DD766"; static acpi_status acpi_pci_run_osc(acpi_handle handle, @@ -158,14 +207,14 @@ static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, support &= OSC_PCI_SUPPORT_MASKS; support |= root->osc_support_set; - capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE; - capbuf[OSC_SUPPORT_TYPE] = support; + capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; + capbuf[OSC_SUPPORT_DWORD] = support; if (control) { *control &= OSC_PCI_CONTROL_MASKS; - capbuf[OSC_CONTROL_TYPE] = *control | root->osc_control_set; + capbuf[OSC_CONTROL_DWORD] = *control | root->osc_control_set; } else { /* Run _OSC query only with existing controls. */ - capbuf[OSC_CONTROL_TYPE] = root->osc_control_set; + capbuf[OSC_CONTROL_DWORD] = root->osc_control_set; } status = acpi_pci_run_osc(root->device->handle, capbuf, &result); @@ -180,11 +229,7 @@ static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root, static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags) { acpi_status status; - acpi_handle tmp; - status = acpi_get_handle(root->device->handle, "_OSC", &tmp); - if (ACPI_FAILURE(status)) - return status; mutex_lock(&osc_lock); status = acpi_pci_query_osc(root, flags, NULL); mutex_unlock(&osc_lock); @@ -316,9 +361,8 @@ EXPORT_SYMBOL_GPL(acpi_get_pci_dev); acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req) { struct acpi_pci_root *root; - acpi_status status; + acpi_status status = AE_OK; u32 ctrl, capbuf[3]; - acpi_handle tmp; if (!mask) return AE_BAD_PARAMETER; @@ -331,10 +375,6 @@ acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req) if (!root) return AE_NOT_EXIST; - status = acpi_get_handle(handle, "_OSC", &tmp); - if (ACPI_FAILURE(status)) - return status; - mutex_lock(&osc_lock); *mask = ctrl | root->osc_control_set; @@ -349,17 +389,21 @@ acpi_status acpi_pci_osc_control_set(acpi_handle handle, u32 *mask, u32 req) goto out; if (ctrl == *mask) break; + decode_osc_control(root, "platform does not support", + ctrl & ~(*mask)); ctrl = *mask; } if ((ctrl & req) != req) { + decode_osc_control(root, "not requesting control; platform does not support", + req & ~(ctrl)); status = AE_SUPPORT; goto out; } - capbuf[OSC_QUERY_TYPE] = 0; - capbuf[OSC_SUPPORT_TYPE] = root->osc_support_set; - capbuf[OSC_CONTROL_TYPE] = ctrl; + capbuf[OSC_QUERY_DWORD] = 0; + capbuf[OSC_SUPPORT_DWORD] = root->osc_support_set; + capbuf[OSC_CONTROL_DWORD] = ctrl; status = acpi_pci_run_osc(handle, capbuf, mask); if (ACPI_SUCCESS(status)) root->osc_control_set = *mask; @@ -369,6 +413,87 @@ out: } EXPORT_SYMBOL(acpi_pci_osc_control_set); +static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm, + int *clear_aspm) +{ + u32 support, control, requested; + acpi_status status; + struct acpi_device *device = root->device; + acpi_handle handle = device->handle; + + /* + * All supported architectures that use ACPI have support for + * PCI domains, so we indicate this in _OSC support capabilities. + */ + support = OSC_PCI_SEGMENT_GROUPS_SUPPORT; + if (pci_ext_cfg_avail()) + support |= OSC_PCI_EXT_CONFIG_SUPPORT; + if (pcie_aspm_support_enabled()) + support |= OSC_PCI_ASPM_SUPPORT | OSC_PCI_CLOCK_PM_SUPPORT; + if (pci_msi_enabled()) + support |= OSC_PCI_MSI_SUPPORT; + + decode_osc_support(root, "OS supports", support); + status = acpi_pci_osc_support(root, support); + if (ACPI_FAILURE(status)) { + dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n", + acpi_format_exception(status)); + *no_aspm = 1; + return; + } + + if (pcie_ports_disabled) { + dev_info(&device->dev, "PCIe port services disabled; not requesting _OSC control\n"); + return; + } + + if ((support & ACPI_PCIE_REQ_SUPPORT) != ACPI_PCIE_REQ_SUPPORT) { + decode_osc_support(root, "not requesting OS control; OS requires", + ACPI_PCIE_REQ_SUPPORT); + return; + } + + control = OSC_PCI_EXPRESS_CAPABILITY_CONTROL + | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL + | OSC_PCI_EXPRESS_PME_CONTROL; + + if (pci_aer_available()) { + if (aer_acpi_firmware_first()) + dev_info(&device->dev, + "PCIe AER handled by firmware\n"); + else + control |= OSC_PCI_EXPRESS_AER_CONTROL; + } + + requested = control; + status = acpi_pci_osc_control_set(handle, &control, + OSC_PCI_EXPRESS_CAPABILITY_CONTROL); + if (ACPI_SUCCESS(status)) { + decode_osc_control(root, "OS now controls", control); + if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { + /* + * We have ASPM control, but the FADT indicates + * that it's unsupported. Clear it. + */ + *clear_aspm = 1; + } + } else { + decode_osc_control(root, "OS requested", requested); + decode_osc_control(root, "platform willing to grant", control); + dev_info(&device->dev, "_OSC failed (%s); disabling ASPM\n", + acpi_format_exception(status)); + + /* + * We want to disable ASPM here, but aspm_disabled + * needs to remain in its state from boot so that we + * properly handle PCIe 1.1 devices. So we set this + * flag here, to defer the action until after the ACPI + * root scan. + */ + *no_aspm = 1; + } +} + static int acpi_pci_root_add(struct acpi_device *device, const struct acpi_device_id *not_used) { @@ -376,9 +501,8 @@ static int acpi_pci_root_add(struct acpi_device *device, acpi_status status; int result; struct acpi_pci_root *root; - u32 flags, base_flags; acpi_handle handle = device->handle; - bool no_aspm = false, clear_aspm = false; + int no_aspm = 0, clear_aspm = 0; root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL); if (!root) @@ -431,81 +555,7 @@ static int acpi_pci_root_add(struct acpi_device *device, root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle); - /* - * All supported architectures that use ACPI have support for - * PCI domains, so we indicate this in _OSC support capabilities. - */ - flags = base_flags = OSC_PCI_SEGMENT_GROUPS_SUPPORT; - acpi_pci_osc_support(root, flags); - - if (pci_ext_cfg_avail()) - flags |= OSC_EXT_PCI_CONFIG_SUPPORT; - if (pcie_aspm_support_enabled()) { - flags |= OSC_ACTIVE_STATE_PWR_SUPPORT | - OSC_CLOCK_PWR_CAPABILITY_SUPPORT; - } - if (pci_msi_enabled()) - flags |= OSC_MSI_SUPPORT; - if (flags != base_flags) { - status = acpi_pci_osc_support(root, flags); - if (ACPI_FAILURE(status)) { - dev_info(&device->dev, "ACPI _OSC support " - "notification failed, disabling PCIe ASPM\n"); - no_aspm = true; - flags = base_flags; - } - } - - if (!pcie_ports_disabled - && (flags & ACPI_PCIE_REQ_SUPPORT) == ACPI_PCIE_REQ_SUPPORT) { - flags = OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL - | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL - | OSC_PCI_EXPRESS_PME_CONTROL; - - if (pci_aer_available()) { - if (aer_acpi_firmware_first()) - dev_dbg(&device->dev, - "PCIe errors handled by BIOS.\n"); - else - flags |= OSC_PCI_EXPRESS_AER_CONTROL; - } - - dev_info(&device->dev, - "Requesting ACPI _OSC control (0x%02x)\n", flags); - - status = acpi_pci_osc_control_set(handle, &flags, - OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL); - if (ACPI_SUCCESS(status)) { - dev_info(&device->dev, - "ACPI _OSC control (0x%02x) granted\n", flags); - if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_ASPM) { - /* - * We have ASPM control, but the FADT indicates - * that it's unsupported. Clear it. - */ - clear_aspm = true; - } - } else { - dev_info(&device->dev, - "ACPI _OSC request failed (%s), " - "returned control mask: 0x%02x\n", - acpi_format_exception(status), flags); - dev_info(&device->dev, - "ACPI _OSC control for PCIe not granted, disabling ASPM\n"); - /* - * We want to disable ASPM here, but aspm_disabled - * needs to remain in its state from boot so that we - * properly handle PCIe 1.1 devices. So we set this - * flag here, to defer the action until after the ACPI - * root scan. - */ - no_aspm = true; - } - } else { - dev_info(&device->dev, - "Unable to request _OSC control " - "(_OSC support mask: 0x%02x)\n", flags); - } + negotiate_os_control(root, &no_aspm, &clear_aspm); /* * TBD: Need PCI interface for enumeration/configuration of roots.