linux-kernel - [PATCH 1/2] drm/amdgpu: Reset GPU on S0ix when device supports BOCO

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Date:   Wed, 29 Mar 2023 17:59:29 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     alexander.deucher@....com, christian.koenig@....com,
        Xinhui.Pan@....com
Cc:     Kai-Heng Feng <kai.heng.feng@...onical.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Mario Limonciello <mario.limonciello@....com>,
        Bokun Zhang <Bokun.Zhang@....com>,
        Maxime Ripard <maxime@...no.tech>,
        Tim Huang <tim.huang@....com>,
        Jingyu Wang <jingyuwang_vip@....com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Hawking Zhang <Hawking.Zhang@....com>,
        Lijo Lazar <lijo.lazar@....com>,
        Andrey Grodzovsky <andrey.grodzovsky@....com>,
        YiPeng Chai <YiPeng.Chai@....com>,
        Somalapuram Amaranath <Amaranath.Somalapuram@....com>,
        Evan Quan <evan.quan@....com>,
        Guchun Chen <guchun.chen@....com>,
        Michel Dänzer <mdaenzer@...hat.com>,
        Kenneth Feng <kenneth.feng@....com>,
        Jiansong Chen <Jiansong.Chen@....com>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] drm/amdgpu: Reset GPU on S0ix when device supports BOCO

When the power is lost due to ACPI power resources being turned off, the
driver should reset the GPU so it can work anew.

First, _PR3 support of the hierarchy needs to be found correctly. Since
the GPU on some discrete GFX cards is behind a PCIe switch, checking the
_PR3 on downstream port alone is not enough, as the _PR3 can associate
to the root port above the PCIe switch.

Once the _PR3 is found and BOCO support is correctly marked, use that
information to inform the GPU should be reset. This solves an issue that
system freeze on a Intel ADL desktop that uses S0ix for sleep and D3cold
is supported for the GFX slot.

Fixes: 0064b0ce85bb ("drm/amd/pm: enable ASPM by default")
Link: https://gitlab.freedesktop.org/drm/amd/-/issues/1885
Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2458
Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c   |  3 +++
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c |  7 ++++++-
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c    | 12 +++++-------
 3 files changed, 14 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
index 60b1857f469e..407456ac0e84 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
@@ -987,6 +987,9 @@ bool amdgpu_acpi_should_gpu_reset(struct amdgpu_device *adev)
 	if (amdgpu_sriov_vf(adev))
 		return false;
 
+	if (amdgpu_device_supports_boco(adev_to_drm(adev)))
+		return true;
+
 #if IS_ENABLED(CONFIG_SUSPEND)
 	return pm_suspend_target_state != PM_SUSPEND_TO_IDLE;
 #else
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index f5658359ff5c..d56b7a2bafa6 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -2181,7 +2181,12 @@ static int amdgpu_device_ip_early_init(struct amdgpu_device *adev)
 
 	if (!(adev->flags & AMD_IS_APU)) {
 		parent = pci_upstream_bridge(adev->pdev);
-		adev->has_pr3 = parent ? pci_pr3_present(parent) : false;
+		do {
+			if (pci_pr3_present(parent)) {
+				adev->has_pr3 = true;
+				break;
+			}
+		} while ((parent = pci_upstream_bridge(parent)));
 	}
 
 	amdgpu_amdkfd_device_probe(adev);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index ba5def374368..5d81fcac4b0a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -2415,10 +2415,11 @@ static int amdgpu_pmops_suspend(struct device *dev)
 	struct drm_device *drm_dev = dev_get_drvdata(dev);
 	struct amdgpu_device *adev = drm_to_adev(drm_dev);
 
-	if (amdgpu_acpi_is_s0ix_active(adev))
-		adev->in_s0ix = true;
-	else if (amdgpu_acpi_is_s3_active(adev))
+	if (amdgpu_acpi_is_s3_active(adev) ||
+	    amdgpu_device_supports_boco(drm_dev))
 		adev->in_s3 = true;
+	else if (amdgpu_acpi_is_s0ix_active(adev))
+		adev->in_s0ix = true;
 	if (!adev->in_s0ix && !adev->in_s3)
 		return 0;
 	return amdgpu_device_suspend(drm_dev, true);
@@ -2449,10 +2450,7 @@ static int amdgpu_pmops_resume(struct device *dev)
 		adev->no_hw_access = true;
 
 	r = amdgpu_device_resume(drm_dev, true);
-	if (amdgpu_acpi_is_s0ix_active(adev))
-		adev->in_s0ix = false;
-	else
-		adev->in_s3 = false;
+	adev->in_s0ix = adev->in_s3 = false;
 	return r;
 }
 
-- 
2.34.1