linux-kernel - [PATCH v2 3/3] drm/amd: Avoid evicting resources at S5

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Message-ID: <20250514193406.3998101-4-superm1@kernel.org>
Date: Wed, 14 May 2025 14:34:06 -0500
From: Mario Limonciello <superm1@...nel.org>
To: "Rafael J . Wysocki" <rafael@...nel.org>,
	Alex Deucher <alexander.deucher@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Cc: amd-gfx@...ts.freedesktop.org (open list:RADEON and AMDGPU DRM DRIVERS),
	linux-pm@...r.kernel.org (open list:HIBERNATION (aka Software Suspend, aka swsusp)),
	linux-pci@...r.kernel.org (open list:PCI SUBSYSTEM),
	linux-kernel@...r.kernel.org (open list),
	Mario Limonciello <mario.limonciello@....com>,
	AceLan Kao <acelan.kao@...onical.com>,
	Kai-Heng Feng <kaihengf@...dia.com>,
	Mark Pearson <mpearson-lenovo@...ebb.ca>,
	Denis Benato <benato.denis96@...il.com>,
	Merthan Karakaş <m3rthn.k@...il.com>
Subject: [PATCH v2 3/3] drm/amd: Avoid evicting resources at S5

From: Mario Limonciello <mario.limonciello@....com>

Normally resources are evicted on dGPUs at suspend or hibernate and
on APUs at hibernate.  These steps are unnecessary when using the S4
callbacks to put the system into S5.

Cc: AceLan Kao <acelan.kao@...onical.com>
Cc: Kai-Heng Feng <kaihengf@...dia.com>
Cc: Mark Pearson <mpearson-lenovo@...ebb.ca>
Cc: Denis Benato <benato.denis96@...il.com>
Cc: Merthan Karakaş <m3rthn.k@...il.com>
Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 4d1b54f58495a..ea1385b6d894f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -4960,6 +4960,10 @@ static int amdgpu_device_evict_resources(struct amdgpu_device *adev)
 	if (!adev->in_s4 && (adev->flags & AMD_IS_APU))
 		return 0;
 
+	/* No need to evict when going to S5 through S4 callbacks */
+	if (system_state == SYSTEM_HALT || system_state == SYSTEM_POWER_OFF)
+		return 0;
+
 	ret = amdgpu_ttm_evict_resources(adev, TTM_PL_VRAM);
 	if (ret)
 		DRM_WARN("evicting device resources failed\n");
-- 
2.43.0