As Nicolai described before:The kernel will reject all command submission from contexts which where created before the VRAM lost happened.
We expose the VRAM lost counter to userspace. When Mesa sees that a command submission is rejected it will query VRAM lost counter and declare all resources which where in VRAM at this moment as invalidated. E.g. shader binaries, texture descriptors etc.. will be reuploaded when they are used the next time.
The application needs to recreate it's GL context, just in the same way as it would if we found this context guilty of causing a reset.
You should be able to handle this the same way in Vulkan and I think we can expose the GPU reset counter to userspace as well. This way you can implement the strict mode in userspace and don't need to affect all applications with that. In other words the effect will be limited to the Vulkan stack.
Regards, Christian. Am 10.10.2017 um 09:12 schrieb Liu, Monk:
Then the question is how we treat recovery if VRAM lost ? -----Original Message----- From: Koenig, Christian Sent: 2017年10月10日 14:59 To: Liu, Monk <[email protected]>; Nicolai Hähnle <[email protected]>; [email protected]; Daenzer, Michel <[email protected]> Subject: Re: [PATCH 09/12] drm/amdgpu/sriov:return -ENODEV if gpu reseted As Nicolai explained that approach simply won't work. The fd is used by more than just the closed source Vulkan driver and I think even by some components not developed by AMD (common X code? Michel please comment as well). So closing it and reopening it to handle a GPU reset is simply not an option. Regards, Christian. Am 10.10.2017 um 06:26 schrieb Liu, Monk:After VRAM lost happens, all clients no matter radv/mesa/ogl is useless, Any drivers uses this FD should be denied by KMD after VRAM lost, and UMD can destroy/close this FD and re-open it and rebuild all resources That's the only option for VRAM lost case -----Original Message----- From: Nicolai Hähnle [mailto:[email protected]] Sent: 2017年10月9日 19:01 To: Liu, Monk <[email protected]>; Koenig, Christian <[email protected]>; [email protected] Subject: Re: [PATCH 09/12] drm/amdgpu/sriov:return -ENODEV if gpu reseted On 09.10.2017 10:35, Liu, Monk wrote:Please be aware that this policy is what the strict mode defined and what customer want, And also please check VK spec, it defines that after GPU reset all vk INSTANCE should close/release its resource/device/ctx and all buffers, and call re-initvkinstance after gpu resetSorry, but you simply cannot implement a correct user-space implementation of those specs on top of this. It will break as soon as you have both OpenGL and Vulkan running in the same process (or heck, our Vulkan and radv :)), because both drivers will use the same fd. Cheers, NicolaiSo this whole approach is what just aligned with the spec, and to not influence with current MESA/OGL client that's why I put the whole approach into the strict mode And by default strict mode is not selected BR Monk -----Original Message----- From: Christian König [mailto:[email protected]] Sent: 2017年10月9日 16:26 To: Liu, Monk <[email protected]>; [email protected] Subject: Re: [PATCH 09/12] drm/amdgpu/sriov:return -ENODEV if gpu reseted Am 30.09.2017 um 08:03 schrieb Monk Liu:for SRIOV strict mode gpu reset: In kms open we mark the latest adev->gpu_reset_counter in fpriv we return -ENODEV in cs_ioctl or info_ioctl if they found fpriv->gpu_reset_counter != adev->gpu_reset_counter. this way we prevent a potential bad process/FD from submitting cmds and notify userspace with -ENODEV. userspace should close all BO/ctx and re-open dri FD to re-create virtual memory system for this processThe whole aproach is a NAK from my side. We need to enable userspace to continue, not force it into process termination to recover. Otherwise we could send a SIGTERM in the first place. Regards, Christian.Change-Id: Ib4c179f28a3d0783837566f29de07fc14aa9b9a4 Signed-off-by: Monk Liu <[email protected]> --- drivers/gpu/drm/amd/amdgpu/amdgpu.h | 1 + drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 5 +++++ drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c | 7 +++++++ 3 files changed, 13 insertions(+) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h index de9c164..b40d4ba 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h @@ -772,6 +772,7 @@ struct amdgpu_fpriv { struct idr bo_list_handles; struct amdgpu_ctx_mgr ctx_mgr; u32 vram_lost_counter; + int gpu_reset_counter; };/*diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c index 9467cf6..6a1515e 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c @@ -1199,6 +1199,11 @@ int amdgpu_cs_ioctl(struct drm_device *dev, void *data, struct drm_file *filp) if (amdgpu_kms_vram_lost(adev, fpriv)) return -ENODEV;+ if (amdgpu_sriov_vf(adev) &&+ amdgpu_sriov_reset_level == 1 && + fpriv->gpu_reset_counter < atomic_read(&adev->gpu_reset_counter)) + return -ENODEV; + parser.adev = adev; parser.filp = filp;diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.cb/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c index 282f45b..bd389cf 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c @@ -285,6 +285,11 @@ static int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file if (amdgpu_kms_vram_lost(adev, fpriv)) return -ENODEV;+ if (amdgpu_sriov_vf(adev) &&+ amdgpu_sriov_reset_level == 1 && + fpriv->gpu_reset_counter < atomic_read(&adev->gpu_reset_counter)) + return -ENODEV; + switch (info->query) { case AMDGPU_INFO_ACCEL_WORKING: ui32 = adev->accel_working; @@ -824,6 +829,8 @@ int amdgpu_driver_open_kms(struct drm_device *dev, struct drm_file *file_priv) goto out_suspend; }+ fpriv->gpu_reset_counter = atomic_read(&adev->gpu_reset_counter);+ r = amdgpu_vm_init(adev, &fpriv->vm, AMDGPU_VM_CONTEXT_GFX, 0); if (r) {_______________________________________________ amd-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/amd-gfx-- Lerne, wie die Welt wirklich ist, Aber vergiss niemals, wie sie sein sollte.
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