From: Felix Kuehling <Felix.Kuehling@amd.com>
To: dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org
Cc: Felix Kuehling <Felix.Kuehling@amd.com>
Subject: [PATCH 2/2] drm/amdgpu: Implement ttm_bo_driver.access_memory callback v2
Date: Mon, 17 Jul 2017 23:57:03 -0400 [thread overview]
Message-ID: <1500350223-4913-2-git-send-email-Felix.Kuehling@amd.com> (raw)
In-Reply-To: <1500350223-4913-1-git-send-email-Felix.Kuehling@amd.com>
Allows gdb to access contents of user mode mapped VRAM BOs.
v2: return error for non-VRAM pools
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 62 +++++++++++++++++++++++++++++++++
1 file changed, 62 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index ff5614b..4d2a454 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -1115,6 +1115,67 @@ static bool amdgpu_ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
return ttm_bo_eviction_valuable(bo, place);
}
+static int amdgpu_ttm_access_memory(struct ttm_buffer_object *bo,
+ unsigned long offset,
+ void *buf, int len, int write)
+{
+ struct amdgpu_bo *abo = container_of(bo, struct amdgpu_bo, tbo);
+ struct amdgpu_device *adev = amdgpu_ttm_adev(abo->tbo.bdev);
+ struct drm_mm_node *nodes = abo->tbo.mem.mm_node;
+ uint32_t value = 0;
+ int ret = 0;
+ uint64_t pos;
+ unsigned long flags;
+
+ if (bo->mem.mem_type != TTM_PL_VRAM)
+ return -EIO;
+
+ while (offset >= (nodes->size << PAGE_SHIFT)) {
+ offset -= nodes->size << PAGE_SHIFT;
+ ++nodes;
+ }
+ pos = (nodes->start << PAGE_SHIFT) + offset;
+
+ while (len && pos < adev->mc.mc_vram_size) {
+ uint64_t aligned_pos = pos & ~(uint64_t)3;
+ uint32_t bytes = 4 - (pos & 3);
+ uint32_t shift = (pos & 3) * 8;
+ uint32_t mask = 0xffffffff << shift;
+
+ if (len < bytes) {
+ mask &= 0xffffffff >> (bytes - len) * 8;
+ bytes = len;
+ }
+
+ spin_lock_irqsave(&adev->mmio_idx_lock, flags);
+ WREG32(mmMM_INDEX, ((uint32_t)aligned_pos) | 0x80000000);
+ WREG32(mmMM_INDEX_HI, aligned_pos >> 31);
+ if (!write || mask != 0xffffffff)
+ value = RREG32(mmMM_DATA);
+ if (write) {
+ value &= ~mask;
+ value |= (*(uint32_t *)buf << shift) & mask;
+ WREG32(mmMM_DATA, value);
+ }
+ spin_unlock_irqrestore(&adev->mmio_idx_lock, flags);
+ if (!write) {
+ value = (value & mask) >> shift;
+ memcpy(buf, &value, bytes);
+ }
+
+ ret += bytes;
+ buf = (uint8_t *)buf + bytes;
+ pos += bytes;
+ len -= bytes;
+ if (pos >= (nodes->start + nodes->size) << PAGE_SHIFT) {
+ ++nodes;
+ pos = (nodes->start << PAGE_SHIFT);
+ }
+ }
+
+ return ret;
+}
+
static struct ttm_bo_driver amdgpu_bo_driver = {
.ttm_tt_create = &amdgpu_ttm_tt_create,
.ttm_tt_populate = &amdgpu_ttm_tt_populate,
@@ -1130,6 +1191,7 @@ static bool amdgpu_ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
.io_mem_reserve = &amdgpu_ttm_io_mem_reserve,
.io_mem_free = &amdgpu_ttm_io_mem_free,
.io_mem_pfn = amdgpu_ttm_io_mem_pfn,
+ .access_memory = &amdgpu_ttm_access_memory
};
int amdgpu_ttm_init(struct amdgpu_device *adev)
--
1.9.1
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next prev parent reply other threads:[~2017-07-18 3:57 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-18 3:57 [PATCH 1/2] drm/ttm: Implement vm_operations_struct.access v2 Felix Kuehling
2017-07-18 3:57 ` Felix Kuehling [this message]
[not found] ` <1500350223-4913-1-git-send-email-Felix.Kuehling-5C7GfCeVMHo@public.gmane.org>
2017-07-18 14:14 ` Christian König
2017-07-18 14:21 ` Michel Dänzer
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