From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ye0-f178.google.com ([209.85.213.178]:33625 "EHLO mail-ye0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753696Ab3IFRPR (ORCPT ); Fri, 6 Sep 2013 13:15:17 -0400 Received: by mail-ye0-f178.google.com with SMTP id m5so1106114yen.9 for ; Fri, 06 Sep 2013 10:15:16 -0700 (PDT) Subject: [PATCH 14/14] PCI/ACPI: Decode _OSC bitmasks symbolically To: linux-pci@vger.kernel.org From: Bjorn Helgaas Cc: "Rafael J. Wysocki" , linux-acpi@vger.kernel.org, Len Brown Date: Fri, 06 Sep 2013 11:15:14 -0600 Message-ID: <20130906171514.11482.29960.stgit@bhelgaas-glaptop> In-Reply-To: <20130906171010.11482.34235.stgit@bhelgaas-glaptop> References: <20130906171010.11482.34235.stgit@bhelgaas-glaptop> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Sender: linux-pci-owner@vger.kernel.org List-ID: This updates _OSC-related messages to be more human-readable. We now always show the features we declare support for (this was previously invisible) as well as the features we are granted control of. Typical changes: -acpi PNP0A08:00: Requesting ACPI _OSC control (0x1d) -acpi PNP0A08:00: ACPI _OSC control (0x1d) granted +acpi PNP0A08:00: _OSC: OS supports [ExtendedConfig ASPM ClockPM Segments MSI] +acpi PNP0A08:00: _OSC: OS now controls [PCIeHotplug PME AER PCIeCapability] Signed-off-by: Bjorn Helgaas --- drivers/acpi/pci_root.c | 84 +++++++++++++++++++++++++++++++++++++---------- 1 file changed, 67 insertions(+), 17 deletions(-) diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c index 65aefcf..cba966e 100644 --- a/drivers/acpi/pci_root.c +++ b/drivers/acpi/pci_root.c @@ -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, @@ -340,10 +389,14 @@ 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; } @@ -363,7 +416,7 @@ 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; + u32 support, control, requested; acpi_status status; struct acpi_device *device = root->device; acpi_handle handle = device->handle; @@ -379,6 +432,8 @@ static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm, 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", @@ -393,8 +448,8 @@ static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm, } if ((support & ACPI_PCIE_REQ_SUPPORT) != ACPI_PCIE_REQ_SUPPORT) { - dev_info(&device->dev, "Not requesting _OSC control (we support %#02x but %#02x are required)\n", - support, ACPI_PCIE_REQ_SUPPORT); + decode_osc_support(root, "not requesting OS control; OS requires", + ACPI_PCIE_REQ_SUPPORT); return; } @@ -404,21 +459,17 @@ static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm, if (pci_aer_available()) { if (aer_acpi_firmware_first()) - dev_dbg(&device->dev, - "PCIe errors handled by BIOS.\n"); + dev_info(&device->dev, + "PCIe AER handled by firmware\n"); else control |= OSC_PCI_EXPRESS_AER_CONTROL; } - dev_info(&device->dev, - "Requesting ACPI _OSC control (0x%02x)\n", control); - + requested = control; status = acpi_pci_osc_control_set(handle, &control, OSC_PCI_EXPRESS_CAPABILITY_CONTROL); if (ACPI_SUCCESS(status)) { - dev_info(&device->dev, - "ACPI _OSC control (0x%02x) granted\n", - control); + 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 @@ -427,12 +478,11 @@ static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm, *clear_aspm = 1; } } else { - dev_info(&device->dev, - "ACPI _OSC request failed (%s), " - "returned control mask: 0x%02x\n", - acpi_format_exception(status), control); - dev_info(&device->dev, - "ACPI _OSC control for PCIe not granted, disabling ASPM\n"); + 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