[PATCH v2] drm/amdkfd: CRIU export dmabuf handles for GTT BOs

[Yat Sin, David]

This is the link to the user mode change:
https://github.com/checkpoint-restore/criu/pull/1709

Regards,
David

> -----Original Message-----
> From: Kuehling, Felix <Felix.Kuehling at amd.com>
> Sent: Tuesday, March 8, 2022 4:20 PM
> To: Yat Sin, David <David.YatSin at amd.com>; amd-gfx at lists.freedesktop.org;
> dri-devel at lists.freedesktop.org
> Subject: Re: [PATCH v2] drm/amdkfd: CRIU export dmabuf handles for GTT
> BOs
> 
> 
> Am 2022-03-08 um 16:08 schrieb David Yat Sin:
> > Export dmabuf handles for GTT BOs so that their contents can be
> > accessed using SDMA during checkpoint/restore.
> >
> > Signed-off-by: David Yat Sin <david.yatsin at amd.com>
> 
> Looks good to me. Please also post a link to the user mode change for this.
> 
> Note that the user mode code has not been merged upstream yet. I think this
> should be the final cleanup before the user mode CRIU plugin can be merged
> with the updated KFD version dependency.
> 
> Thanks,
>    Felix
> 
> 
> > ---
> >   drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 12 ++++++++----
> >   include/uapi/linux/kfd_ioctl.h           |  3 ++-
> >   2 files changed, 10 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> > b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> > index 2c7d76e67ddb..e1e2362841f8 100644
> > --- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> > +++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
> > @@ -1759,7 +1759,8 @@ static int criu_checkpoint_bos(struct
> kfd_process *p,
> >   					goto exit;
> >   				}
> >   			}
> > -			if (bo_bucket->alloc_flags &
> KFD_IOC_ALLOC_MEM_FLAGS_VRAM) {
> > +			if (bo_bucket->alloc_flags
> > +			    & (KFD_IOC_ALLOC_MEM_FLAGS_VRAM |
> > +KFD_IOC_ALLOC_MEM_FLAGS_GTT)) {
> >   				ret = criu_get_prime_handle(&dumper_bo-
> >tbo.base,
> >   						bo_bucket->alloc_flags &
> >
> 	KFD_IOC_ALLOC_MEM_FLAGS_WRITABLE ? DRM_RDWR : 0, @@ -
> 1812,7
> > +1813,8 @@ static int criu_checkpoint_bos(struct kfd_process *p,
> >
> >   exit:
> >   	while (ret && bo_index--) {
> > -		if (bo_buckets[bo_index].alloc_flags &
> KFD_IOC_ALLOC_MEM_FLAGS_VRAM)
> > +		if (bo_buckets[bo_index].alloc_flags
> > +		    & (KFD_IOC_ALLOC_MEM_FLAGS_VRAM |
> KFD_IOC_ALLOC_MEM_FLAGS_GTT))
> >   			close_fd(bo_buckets[bo_index].dmabuf_fd);
> >   	}
> >
> > @@ -2211,7 +2213,8 @@ static int criu_restore_bo(struct kfd_process
> > *p,
> >
> >   	pr_debug("map memory was successful for the BO\n");
> >   	/* create the dmabuf object and export the bo */
> > -	if (bo_bucket->alloc_flags & KFD_IOC_ALLOC_MEM_FLAGS_VRAM) {
> > +	if (bo_bucket->alloc_flags
> > +	    & (KFD_IOC_ALLOC_MEM_FLAGS_VRAM |
> KFD_IOC_ALLOC_MEM_FLAGS_GTT))
> > +{
> >   		ret = criu_get_prime_handle(&kgd_mem->bo->tbo.base,
> DRM_RDWR,
> >   					    &bo_bucket->dmabuf_fd);
> >   		if (ret)
> > @@ -2281,7 +2284,8 @@ static int criu_restore_bos(struct kfd_process
> > *p,
> >
> >   exit:
> >   	while (ret && i--) {
> > -		if (bo_buckets[i].alloc_flags &
> KFD_IOC_ALLOC_MEM_FLAGS_VRAM)
> > +		if (bo_buckets[i].alloc_flags
> > +		   & (KFD_IOC_ALLOC_MEM_FLAGS_VRAM |
> KFD_IOC_ALLOC_MEM_FLAGS_GTT))
> >   			close_fd(bo_buckets[i].dmabuf_fd);
> >   	}
> >   	kvfree(bo_buckets);
> > diff --git a/include/uapi/linux/kfd_ioctl.h
> > b/include/uapi/linux/kfd_ioctl.h index b40687bf1014..eb9ff85f8556
> > 100644
> > --- a/include/uapi/linux/kfd_ioctl.h
> > +++ b/include/uapi/linux/kfd_ioctl.h
> > @@ -33,9 +33,10 @@
> >    * - 1.5 - Add SVM API
> >    * - 1.6 - Query clear flags in SVM get_attr API
> >    * - 1.7 - Checkpoint Restore (CRIU) API
> > + * - 1.8 - CRIU - Support for SDMA transfers with GTT BOs
> >    */
> >   #define KFD_IOCTL_MAJOR_VERSION 1
> > -#define KFD_IOCTL_MINOR_VERSION 7
> > +#define KFD_IOCTL_MINOR_VERSION 8
> >
> >   struct kfd_ioctl_get_version_args {
> >   	__u32 major_version;	/* from KFD */