AuxXxilium/linux_dsm_epyc7002
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drm/nouveau/acpi: fix lockup with PCIe runtime PM

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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>
This commit is contained in:
Peter Wu 2016-07-15 15:12:18 +02:00 committed by Ben Skeggs
parent cba97805cb
commit 692a17dcc2
1 changed files with 31 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
drivers/gpu/drm/nouveau/nouveau_acpi.c
View File

@ -46,6 +46,7 @@ static struct nouveau_dsm_priv {
bool dsm_detected;
bool optimus_detected;
bool optimus_flags_detected;
bool optimus_skip_dsm;
acpi_handle dhandle;
acpi_handle rom_handle;
} nouveau_dsm_priv;
@ -212,9 +213,28 @@ static const struct vga_switcheroo_handler nouveau_dsm_handler = {
.get_client_id = nouveau_dsm_get_client_id,
};
/*
* Firmware supporting Windows 8 or later do not use _DSM to put the device into
* D3cold, they instead rely on disabling power resources on the parent.
*/
static bool nouveau_pr3_present(struct pci_dev *pdev)
{
struct pci_dev *parent_pdev = pci_upstream_bridge(pdev);
struct acpi_device *parent_adev;
if (!parent_pdev)
return false;
parent_adev = ACPI_COMPANION(&parent_pdev->dev);
if (!parent_adev)
return false;
return acpi_has_method(parent_adev->handle, "_PR3");
}
static void nouveau_dsm_pci_probe(struct pci_dev *pdev, acpi_handle *dhandle_out,
bool *has_mux, bool *has_opt,
bool *has_opt_flags)
bool *has_opt_flags, bool *has_pr3)
{
acpi_handle dhandle;
bool supports_mux;
@ -239,6 +259,7 @@ static void nouveau_dsm_pci_probe(struct pci_dev *pdev, acpi_handle *dhandle_out
*has_mux = supports_mux;
*has_opt = !!optimus_funcs;
*has_opt_flags = optimus_funcs & (1 << NOUVEAU_DSM_OPTIMUS_FLAGS);
*has_pr3 = false;
if (optimus_funcs) {
uint32_t result;
@ -248,6 +269,8 @@ static void nouveau_dsm_pci_probe(struct pci_dev *pdev, acpi_handle *dhandle_out
(result & OPTIMUS_ENABLED) ? "enabled" : "disabled",
(result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "",
(result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : "");
*has_pr3 = nouveau_pr3_present(pdev);
}
}
@ -260,6 +283,7 @@ static bool nouveau_dsm_detect(void)
bool has_mux = false;
bool has_optimus = false;
bool has_optimus_flags = false;
bool has_power_resources = false;
int vga_count = 0;
bool guid_valid;
bool ret = false;
@ -275,14 +299,14 @@ static bool nouveau_dsm_detect(void)
vga_count++;
nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus,
&has_optimus_flags);
&has_optimus_flags, &has_power_resources);
}
while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) {
vga_count++;
nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus,
&has_optimus_flags);
&has_optimus_flags, &has_power_resources);
}
/* find the optimus DSM or the old v1 DSM */
@ -292,8 +316,11 @@ static bool nouveau_dsm_detect(void)
&buffer);
printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
acpi_method_name);
if (has_power_resources)
pr_info("nouveau: detected PR support, will not use DSM\n");
nouveau_dsm_priv.optimus_detected = true;
nouveau_dsm_priv.optimus_flags_detected = has_optimus_flags;
nouveau_dsm_priv.optimus_skip_dsm = has_power_resources;
ret = true;
} else if (vga_count == 2 && has_mux && guid_valid) {
nouveau_dsm_priv.dhandle = dhandle;
@ -324,7 +351,7 @@ void nouveau_register_dsm_handler(void)
void nouveau_switcheroo_optimus_dsm(void)
{
u32 result = 0;
if (!nouveau_dsm_priv.optimus_detected)
if (!nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.optimus_skip_dsm)
return;
if (nouveau_dsm_priv.optimus_flags_detected)