linux-ext4 - RE: [PATCH] drm/amdkfd: Add SVM API support capability bits

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Date:   Wed, 30 Mar 2022 21:26:52 +0000
From:   "Sierra Guiza, Alejandro (Alex)" <Alex.Sierra@....com>
To:     "Sierra Guiza, Alejandro (Alex)" <Alex.Sierra@....com>,
        "jgg@...dia.com" <jgg@...dia.com>
CC:     "rcampbell@...dia.com" <rcampbell@...dia.com>,
        "willy@...radead.org" <willy@...radead.org>,
        "david@...hat.com" <david@...hat.com>,
        "Kuehling, Felix" <Felix.Kuehling@....com>,
        "apopple@...dia.com" <apopple@...dia.com>,
        "amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>,
        "linux-xfs@...r.kernel.org" <linux-xfs@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "jglisse@...hat.com" <jglisse@...hat.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
        "hch@....de" <hch@....de>
Subject: RE: [PATCH] drm/amdkfd: Add SVM API support capability bits

Please ignore this patch.

> -----Original Message-----
> From: amd-gfx <amd-gfx-bounces@...ts.freedesktop.org> On Behalf Of Alex
> Sierra
> Sent: Wednesday, March 30, 2022 4:24 PM
> To: jgg@...dia.com
> Cc: rcampbell@...dia.com; willy@...radead.org; david@...hat.com;
> Kuehling, Felix <Felix.Kuehling@....com>; apopple@...dia.com; amd-
> gfx@...ts.freedesktop.org; linux-xfs@...r.kernel.org; linux-mm@...ck.org;
> jglisse@...hat.com; dri-devel@...ts.freedesktop.org; akpm@...ux-
> foundation.org; linux-ext4@...r.kernel.org; hch@....de
> Subject: [PATCH] drm/amdkfd: Add SVM API support capability bits
> 
> From: Philip Yang <Philip.Yang@....com>
> 
> SVMAPISupported property added to HSA_CAPABILITY, the value match
> HSA_CAPABILITY defined in Thunk spec:
> 
> SVMAPISupported: it will not be supported on older kernels that don't have
> HMM or on systems with GFXv8 or older GPUs without support for 48-bit
> virtual addresses.
> 
> CoherentHostAccess property added to HSA_MEMORYPROPERTY, the value
> match HSA_MEMORYPROPERTY defined in Thunk spec:
> 
> CoherentHostAccess: whether or not device memory can be coherently
> accessed by the host CPU.
> 
> Signed-off-by: Philip Yang <Philip.Yang@....com>
> Reviewed-by: Felix Kuehling <Felix.Kuehling@....com>
> Signed-off-by: Felix Kuehling <Felix.Kuehling@....com>
> Signed-off-by: Alex Deucher <alexander.deucher@....com>
> ---
>  drivers/gpu/drm/amd/amdkfd/kfd_topology.c |  6 ++++++
> drivers/gpu/drm/amd/amdkfd/kfd_topology.h | 10 ++++++----
>  2 files changed, 12 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_topology.c
> b/drivers/gpu/drm/amd/amdkfd/kfd_topology.c
> index cdef608db4f4..083ac9babfa8 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_topology.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_topology.c
> @@ -1419,6 +1419,12 @@ int kfd_topology_add_device(struct kfd_dev
> *gpu)
>  		dev->node_props.capability |= (adev->ras_features != 0) ?
>  			HSA_CAP_RASEVENTNOTIFY : 0;
> 
> +	/* SVM API and HMM page migration work together, device memory
> type
> +	 * is initialized to not 0 when page migration register device memory.
> +	 */
> +	if (adev->kfd.dev->pgmap.type != 0)
> +		dev->node_props.capability |=
> HSA_CAP_SVMAPI_SUPPORTED;
> +
>  	kfd_debug_print_topology();
> 
>  	if (!res)
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_topology.h
> b/drivers/gpu/drm/amd/amdkfd/kfd_topology.h
> index b8b68087bd7a..6bd6380b0ee0 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_topology.h
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_topology.h
> @@ -53,8 +53,9 @@
>  #define HSA_CAP_ASIC_REVISION_MASK		0x03c00000
>  #define HSA_CAP_ASIC_REVISION_SHIFT		22
>  #define HSA_CAP_SRAM_EDCSUPPORTED		0x04000000
> +#define HSA_CAP_SVMAPI_SUPPORTED		0x08000000
> 
> -#define HSA_CAP_RESERVED			0xf80f8000
> +#define HSA_CAP_RESERVED			0xf00f8000
> 
>  struct kfd_node_properties {
>  	uint64_t hive_id;
> @@ -98,9 +99,10 @@ struct kfd_node_properties {
>  #define HSA_MEM_HEAP_TYPE_GPU_LDS	4
>  #define HSA_MEM_HEAP_TYPE_GPU_SCRATCH	5
> 
> -#define HSA_MEM_FLAGS_HOT_PLUGGABLE	0x00000001
> -#define HSA_MEM_FLAGS_NON_VOLATILE	0x00000002
> -#define HSA_MEM_FLAGS_RESERVED		0xfffffffc
> +#define HSA_MEM_FLAGS_HOT_PLUGGABLE		0x00000001
> +#define HSA_MEM_FLAGS_NON_VOLATILE		0x00000002
> +#define HSA_MEM_FLAGS_COHERENTHOSTACCESS	0x00000004
> +#define HSA_MEM_FLAGS_RESERVED			0xfffffff8
> 
>  struct kfd_mem_properties {
>  	struct list_head	list;
> --
> 2.32.0