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drm/nouveau/acpi: fix lockup with PCIe runtime PM
Since "PCI: Add runtime PM support for PCIe ports", the parent PCIe port can be runtime-suspended which disables power resources via ACPI. This is incompatible with DSM, resulting in a GPU device which is still in D3 and locks up the kernel on resume (on a Clevo P651RA, GTX965M). Mirror the behavior of Windows 8 and newer[1] (as observed via an AMLi debugger trace) and stop using the DSM functions for D3cold when power resources are available on the parent PCIe port. pci_d3cold_disable() is not used because on some machines, the old DSM method is broken. On a Lenovo T440p (GT 730M) memory and disk corruption would occur, but that is fixed with this patch[2]. [1]: https://msdn.microsoft.com/windows/hardware/drivers/bringup/firmware-requirements-for-d3cold [2]: https://github.com/Bumblebee-Project/bbswitch/issues/78#issuecomment-223549072 v2: simply check directly for _PR3. Added affected machines. v3: fixed block comment coding style. Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Peter Wu <peter@lekensteyn.nl> Acked-by: Dave Airlie <airlied@redhat.com Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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@ -46,6 +46,7 @@ static struct nouveau_dsm_priv {
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bool dsm_detected;
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bool optimus_detected;
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bool optimus_flags_detected;
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bool optimus_skip_dsm;
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acpi_handle dhandle;
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acpi_handle rom_handle;
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} nouveau_dsm_priv;
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@ -212,9 +213,28 @@ static const struct vga_switcheroo_handler nouveau_dsm_handler = {
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.get_client_id = nouveau_dsm_get_client_id,
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};
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/*
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* Firmware supporting Windows 8 or later do not use _DSM to put the device into
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* D3cold, they instead rely on disabling power resources on the parent.
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*/
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static bool nouveau_pr3_present(struct pci_dev *pdev)
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{
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struct pci_dev *parent_pdev = pci_upstream_bridge(pdev);
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struct acpi_device *parent_adev;
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if (!parent_pdev)
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return false;
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parent_adev = ACPI_COMPANION(&parent_pdev->dev);
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if (!parent_adev)
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return false;
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return acpi_has_method(parent_adev->handle, "_PR3");
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}
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static void nouveau_dsm_pci_probe(struct pci_dev *pdev, acpi_handle *dhandle_out,
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bool *has_mux, bool *has_opt,
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bool *has_opt_flags)
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bool *has_opt_flags, bool *has_pr3)
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{
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acpi_handle dhandle;
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bool supports_mux;
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@ -239,6 +259,7 @@ static void nouveau_dsm_pci_probe(struct pci_dev *pdev, acpi_handle *dhandle_out
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*has_mux = supports_mux;
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*has_opt = !!optimus_funcs;
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*has_opt_flags = optimus_funcs & (1 << NOUVEAU_DSM_OPTIMUS_FLAGS);
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*has_pr3 = false;
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if (optimus_funcs) {
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uint32_t result;
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@ -248,6 +269,8 @@ static void nouveau_dsm_pci_probe(struct pci_dev *pdev, acpi_handle *dhandle_out
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(result & OPTIMUS_ENABLED) ? "enabled" : "disabled",
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(result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "",
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(result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : "");
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*has_pr3 = nouveau_pr3_present(pdev);
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}
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}
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@ -260,6 +283,7 @@ static bool nouveau_dsm_detect(void)
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bool has_mux = false;
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bool has_optimus = false;
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bool has_optimus_flags = false;
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bool has_power_resources = false;
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int vga_count = 0;
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bool guid_valid;
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bool ret = false;
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@ -275,14 +299,14 @@ static bool nouveau_dsm_detect(void)
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vga_count++;
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nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus,
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&has_optimus_flags);
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&has_optimus_flags, &has_power_resources);
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}
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while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) {
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vga_count++;
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nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus,
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&has_optimus_flags);
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&has_optimus_flags, &has_power_resources);
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}
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/* find the optimus DSM or the old v1 DSM */
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@ -292,8 +316,11 @@ static bool nouveau_dsm_detect(void)
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&buffer);
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printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
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acpi_method_name);
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if (has_power_resources)
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pr_info("nouveau: detected PR support, will not use DSM\n");
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nouveau_dsm_priv.optimus_detected = true;
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nouveau_dsm_priv.optimus_flags_detected = has_optimus_flags;
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nouveau_dsm_priv.optimus_skip_dsm = has_power_resources;
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ret = true;
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} else if (vga_count == 2 && has_mux && guid_valid) {
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nouveau_dsm_priv.dhandle = dhandle;
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@ -324,7 +351,7 @@ void nouveau_register_dsm_handler(void)
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void nouveau_switcheroo_optimus_dsm(void)
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{
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u32 result = 0;
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if (!nouveau_dsm_priv.optimus_detected)
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if (!nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.optimus_skip_dsm)
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return;
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if (nouveau_dsm_priv.optimus_flags_detected)
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