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

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Message-ID: <20220330212420.12003-1-alex.sierra@amd.com>
Date:   Wed, 30 Mar 2022 16:24:20 -0500
From:   Alex Sierra <alex.sierra@....com>
To:     <jgg@...dia.com>
CC:     <david@...hat.com>, <Felix.Kuehling@....com>, <linux-mm@...ck.org>,
        <rcampbell@...dia.com>, <linux-ext4@...r.kernel.org>,
        <linux-xfs@...r.kernel.org>, <amd-gfx@...ts.freedesktop.org>,
        <dri-devel@...ts.freedesktop.org>, <hch@....de>,
        <jglisse@...hat.com>, <apopple@...dia.com>, <willy@...radead.org>,
        <akpm@...ux-foundation.org>
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