[Bug 214621] WARNING: CPU: 3 PID: 521 at drivers/gpu/drm/ttm/ttm_bo.c:409 ttm_bo_release+0xb64/0xe40 [ttm]

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=214621

--- Comment #18 from Lang Yu (Lang.Yu@amd.com) ---
Hi all,

I reproduced the issue. Thanks for Erhard F.'s work!

The problem is the pinned BO of last call to 
amdgpu_display_crtc_page_flip_target() was not unpinned properly.


int amdgpu_display_crtc_page_flip_target(struct drm_crtc *crtc,
                                struct drm_framebuffer *fb,
                                struct drm_pending_vblank_event *event,
                                uint32_t page_flip_flags, uint32_t target,
                                struct drm_modeset_acquire_ctx *ctx)
{
        struct drm_device *dev = crtc->dev;
        struct amdgpu_device *adev = drm_to_adev(dev);
        struct amdgpu_crtc *amdgpu_crtc = to_amdgpu_crtc(crtc);
        struct drm_gem_object *obj;
        struct amdgpu_flip_work *work;
        struct amdgpu_bo *new_abo;
        unsigned long flags;
        u64 tiling_flags;
        int i, r;

        work = kzalloc(sizeof *work, GFP_KERNEL);
        if (work == NULL)
                return -ENOMEM;

        INIT_DELAYED_WORK(&work->flip_work, amdgpu_display_flip_work_func);
        INIT_WORK(&work->unpin_work, amdgpu_display_unpin_work_func);

        work->event = event;
        work->adev = adev;
        work->crtc_id = amdgpu_crtc->crtc_id;
        work->async = (page_flip_flags & DRM_MODE_PAGE_FLIP_ASYNC) != 0;

        /* schedule unpin of the old buffer */
        obj = crtc->primary->fb->obj[0];

        /* take a reference to the old object */
        work->old_abo = gem_to_amdgpu_bo(obj);
        amdgpu_bo_ref(work->old_abo);

        obj = fb->obj[0];
        new_abo = gem_to_amdgpu_bo(obj);

        /* pin the new buffer */
        r = amdgpu_bo_reserve(new_abo, false);
        if (unlikely(r != 0)) {
                DRM_ERROR("failed to reserve new abo buffer before flip\n");
                goto cleanup;
        }

        if (!adev->enable_virtual_display) {
                r = amdgpu_bo_pin(new_abo,
                                  amdgpu_display_supported_domains(adev,
new_abo->flags));
                if (unlikely(r != 0)) {
                        DRM_ERROR("failed to pin new abo buffer before
flip\n");
                        goto unreserve;
                }
        }

        ......

}

Regards,
Lang

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