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From 7647b85138330b2e7250f92cd97da55803bd84b5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Michel=20D=C3=A4nzer?= <michel.daenzer@amd.com>
Date: Wed, 11 Jul 2018 12:00:40 +0200
Subject: [PATCH 4889/5725] drm/amdgpu: Make pin_size values atomic
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Concurrent execution of the non-atomic arithmetic could result in
completely bogus values.
v2:
* Rebased on v2 of the previous patch
Cc: stable@vger.kernel.org
Bugzilla: https://bugs.freedesktop.org/106872
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Raveendra Talabattula <raveendra.talabattula@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu.h | 6 +++---
drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 2 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c | 22 +++++++++++-----------
drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 14 ++++++++------
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 6 +++---
5 files changed, 26 insertions(+), 24 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index e056008..2fa7976 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -1651,9 +1651,9 @@ struct amdgpu_device {
DECLARE_HASHTABLE(mn_hash, 7);
/* tracking pinned memory */
- u64 vram_pin_size;
- u64 visible_pin_size;
- u64 gart_pin_size;
+ atomic64_t vram_pin_size;
+ atomic64_t visible_pin_size;
+ atomic64_t gart_pin_size;
/* amdkfd interface */
struct kfd_dev *kfd;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
index 62182e9..a4aaf37 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
@@ -262,7 +262,7 @@ static void amdgpu_cs_get_threshold_for_moves(struct amdgpu_device *adev,
return;
}
- total_vram = adev->gmc.real_vram_size - adev->vram_pin_size;
+ total_vram = adev->gmc.real_vram_size - atomic64_read(&adev->vram_pin_size);
used_vram = amdgpu_vram_mgr_usage(&adev->mman.bdev.man[TTM_PL_VRAM]);
free_vram = used_vram >= total_vram ? 0 : total_vram - used_vram;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
index 02a5ef7..4cd3317 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
@@ -515,13 +515,13 @@ static int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file
case AMDGPU_INFO_VRAM_GTT: {
struct drm_amdgpu_info_vram_gtt vram_gtt;
- vram_gtt.vram_size = adev->gmc.real_vram_size;
- vram_gtt.vram_size -= adev->vram_pin_size;
- vram_gtt.vram_cpu_accessible_size = adev->gmc.visible_vram_size;
- vram_gtt.vram_cpu_accessible_size -= adev->visible_pin_size;
+ vram_gtt.vram_size = adev->gmc.real_vram_size -
+ atomic64_read(&adev->vram_pin_size);
+ vram_gtt.vram_cpu_accessible_size = adev->gmc.visible_vram_size -
+ atomic64_read(&adev->visible_pin_size);
vram_gtt.gtt_size = adev->mman.bdev.man[TTM_PL_TT].size;
vram_gtt.gtt_size *= PAGE_SIZE;
- vram_gtt.gtt_size -= adev->gart_pin_size;
+ vram_gtt.gtt_size -= atomic64_read(&adev->gart_pin_size);
return copy_to_user(out, &vram_gtt,
min((size_t)size, sizeof(vram_gtt))) ? -EFAULT : 0;
}
@@ -530,16 +530,16 @@ static int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file
memset(&mem, 0, sizeof(mem));
mem.vram.total_heap_size = adev->gmc.real_vram_size;
- mem.vram.usable_heap_size =
- adev->gmc.real_vram_size - adev->vram_pin_size;
+ mem.vram.usable_heap_size = adev->gmc.real_vram_size -
+ atomic64_read(&adev->vram_pin_size);
mem.vram.heap_usage =
amdgpu_vram_mgr_usage(&adev->mman.bdev.man[TTM_PL_VRAM]);
mem.vram.max_allocation = mem.vram.usable_heap_size * 3 / 4;
mem.cpu_accessible_vram.total_heap_size =
adev->gmc.visible_vram_size;
- mem.cpu_accessible_vram.usable_heap_size =
- adev->gmc.visible_vram_size - adev->visible_pin_size;
+ mem.cpu_accessible_vram.usable_heap_size = adev->gmc.visible_vram_size -
+ atomic64_read(&adev->visible_pin_size);
mem.cpu_accessible_vram.heap_usage =
amdgpu_vram_mgr_vis_usage(&adev->mman.bdev.man[TTM_PL_VRAM]);
mem.cpu_accessible_vram.max_allocation =
@@ -547,8 +547,8 @@ static int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file
mem.gtt.total_heap_size = adev->mman.bdev.man[TTM_PL_TT].size;
mem.gtt.total_heap_size *= PAGE_SIZE;
- mem.gtt.usable_heap_size = mem.gtt.total_heap_size
- - adev->gart_pin_size;
+ mem.gtt.usable_heap_size = mem.gtt.total_heap_size -
+ atomic64_read(&adev->gart_pin_size);
mem.gtt.heap_usage =
amdgpu_gtt_mgr_usage(&adev->mman.bdev.man[TTM_PL_TT]);
mem.gtt.max_allocation = mem.gtt.usable_heap_size * 3 / 4;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index 51f08a8..b483732 100755
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -956,10 +956,11 @@ int amdgpu_bo_pin_restricted(struct amdgpu_bo *bo, u32 domain,
domain = amdgpu_mem_type_to_domain(bo->tbo.mem.mem_type);
if (domain == AMDGPU_GEM_DOMAIN_VRAM) {
- adev->vram_pin_size += amdgpu_bo_size(bo);
- adev->visible_pin_size += amdgpu_vram_mgr_bo_visible_size(bo);
+ atomic64_add(amdgpu_bo_size(bo), &adev->vram_pin_size);
+ atomic64_add(amdgpu_vram_mgr_bo_visible_size(bo),
+ &adev->visible_pin_size);
} else if (domain == AMDGPU_GEM_DOMAIN_GTT) {
- adev->gart_pin_size += amdgpu_bo_size(bo);
+ atomic64_add(amdgpu_bo_size(bo), &adev->gart_pin_size);
}
error:
@@ -1008,10 +1009,11 @@ int amdgpu_bo_unpin(struct amdgpu_bo *bo)
return 0;
if (bo->tbo.mem.mem_type == TTM_PL_VRAM) {
- adev->vram_pin_size -= amdgpu_bo_size(bo);
- adev->visible_pin_size -= amdgpu_vram_mgr_bo_visible_size(bo);
+ atomic64_sub(amdgpu_bo_size(bo), &adev->vram_pin_size);
+ atomic64_sub(amdgpu_vram_mgr_bo_visible_size(bo),
+ &adev->visible_pin_size);
} else if (bo->tbo.mem.mem_type == TTM_PL_TT) {
- adev->gart_pin_size -= amdgpu_bo_size(bo);
+ atomic64_sub(amdgpu_bo_size(bo), &adev->gart_pin_size);
}
for (i = 0; i < bo->placement.num_placement; i++) {
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index 529ddda..cf7f380 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -1666,7 +1666,7 @@ static int amdgpu_direct_gma_init(struct amdgpu_device *adev)
adev->direct_gma.dgma_bo = abo;
/* reserve in gtt */
- adev->gart_pin_size += size;
+ atomic64_add(size,&adev->gart_pin_size);
r = ttm_bo_init_mm(&adev->mman.bdev, AMDGPU_PL_DGMA, size >> PAGE_SHIFT);
if (unlikely(r))
goto error_put_node;
@@ -1682,7 +1682,7 @@ static int amdgpu_direct_gma_init(struct amdgpu_device *adev)
ttm_bo_clean_mm(&adev->mman.bdev, AMDGPU_PL_DGMA);
error_put_node:
- adev->gart_pin_size -= size;
+ atomic64_sub(size,&adev->gart_pin_size);
error_free:
amdgpu_bo_unref(&abo);
@@ -1710,7 +1710,7 @@ static void amdgpu_direct_gma_fini(struct amdgpu_device *adev)
amdgpu_bo_unreserve(adev->direct_gma.dgma_bo);
}
amdgpu_bo_unref(&adev->direct_gma.dgma_bo);
- adev->gart_pin_size -= (u64)amdgpu_direct_gma_size << 20;
+ atomic64_sub((u64)amdgpu_direct_gma_size << 20,&adev->gart_pin_size);
}
#ifdef CONFIG_ENABLE_SSG
--
2.7.4
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