[PATCH] drm/amdgpu: Fix no irq process when evict vram

[Tao, Yintian]

Hi  Lothian


First of all, thanks for your review.

No, it is the patch which achieve the same function for the issue. But it is the root cause of fence timeout.
The patch b9141cd3<https://cgit.freedesktop.org/~agd5f/linux/commit/?h=drm-next-4.16-wip&id=b9141cd3930e390f156739829ca9589fda7926e4> is the word-around for the issue. And I think the varible “shutdown” assignment is better to be located after amdgpu_fini() to ensure no irq miss.

Best Regards
Yintian Tao


From: Mike Lothian [mailto:mike at fireburn.co.uk]
Sent: Wednesday, December 13, 2017 7:23 PM
To: Tao, Yintian <Yintian.Tao at amd.com>
Cc: amd-gfx at lists.freedesktop.org
Subject: Re: [PATCH] drm/amdgpu: Fix no irq process when evict vram

Is this a follow on to https://cgit.freedesktop.org/~agd5f/linux/commit/?h=drm-next-4.16-wip&id=b9141cd3930e390f156739829ca9589fda7926e4

On Wed, 13 Dec 2017 at 07:11 Yintian Tao <yttao at amd.com<mailto:yttao at amd.com>> wrote:
When unload amdgpu driver we use sdma to evict vram but there is no
irq process after sdma completed work which raises that waiting for the
fence costs 2s which will trigger VFLR under SRIOV and at last make
unload driver failed.The reason is that the shutdown varible in adev
is set to true before evict vram, it cause ISR directly return without
processing.Therefore, we need set the varible after evict vram.

Change-Id: I7bf75481aa0744b99c41672b49670adc70b478bd
Signed-off-by: Yintian Tao <yttao at amd.com<mailto:yttao at amd.com>>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index a269bbc..80934ee 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -2458,7 +2458,6 @@ void amdgpu_device_fini(struct amdgpu_device *adev)
        int r;

        DRM_INFO("amdgpu: finishing device.\n");
-       adev->shutdown = true;
        if (adev->mode_info.mode_config_initialized)
                drm_crtc_force_disable_all(adev->ddev);

@@ -2466,6 +2465,7 @@ void amdgpu_device_fini(struct amdgpu_device *adev)
        amdgpu_fence_driver_fini(adev);
        amdgpu_fbdev_fini(adev);
        r = amdgpu_fini(adev);
+       adev->shutdown = true;
        if (adev->firmware.gpu_info_fw) {
                release_firmware(adev->firmware.gpu_info_fw);
                adev->firmware.gpu_info_fw = NULL;
--
2.7.4

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