linux-kernel - [PATCH 2/2] drm/amdgpu: Set PROBE_PREFER

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Message-Id: <20221028154718.2.I30f27b240e63cc269076556407e6eddcf5177b5e@changeid>
Date:   Fri, 28 Oct 2022 15:48:13 -0700
From:   Brian Norris <briannorris@...omium.org>
To:     Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        Xinhui <Xinhui.Pan@....com>
Cc:     linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        amd-gfx@...ts.freedesktop.org,
        Brian Norris <briannorris@...omium.org>
Subject: [PATCH 2/2] drm/amdgpu: Set PROBE_PREFER_ASYNCHRONOUS

This driver often takes over 200ms to start, so it can improve boot
speed to probe it asynchronously.

I did a short review of the driver, and apart from an issue fixed in the
parent patch ("drm/amdgpu: Move racy global PMU list into device"),
there don't appear to be many cross-device dependencies or racy accesses
to global state, so this should be safe.

This driver was pinpointed as part of a survey of top slowest initcalls
(i.e., are built in, and probing synchronously) on a lab of ChromeOS
systems.

Signed-off-by: Brian Norris <briannorris@...omium.org>
---

 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index 3c9fecdd6b2f..2d180e48df1b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -2793,7 +2793,10 @@ static struct pci_driver amdgpu_kms_pci_driver = {
 	.probe = amdgpu_pci_probe,
 	.remove = amdgpu_pci_remove,
 	.shutdown = amdgpu_pci_shutdown,
-	.driver.pm = &amdgpu_pm_ops,
+	.driver = {
+		.pm = &amdgpu_pm_ops,
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
+	},
 	.err_handler = &amdgpu_pci_err_handler,
 	.dev_groups = amdgpu_sysfs_groups,
 };
-- 
2.38.1.273.g43a17bfeac-goog