[PATCH 2/2] amdgpu: add amdgpu_find_bo_by_cpu_mapping interface

[Chunming Zhou <David1.Zhou@amd.com>]

userspace needs to know if the user memory is from BO or malloc.

Change-Id: Ie2dbc13f1c02bc0a996f64f9db83a21da63c1d70
Signed-off-by: Chunming Zhou <David1.Zhou@amd.com>
Reviewed-by: Jammy Zhou <Jammy.Zhou@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
---
 amdgpu/amdgpu.h          | 24 ++++++++++++++++++++++++
 amdgpu/amdgpu_bo.c       | 37 +++++++++++++++++++++++++++++++++++++
 include/drm/amdgpu_drm.h | 12 ++++++++++++
 3 files changed, 73 insertions(+)

diff --git a/amdgpu/amdgpu.h b/amdgpu/amdgpu.h
index baae113..4925056 100644
--- a/amdgpu/amdgpu.h
+++ b/amdgpu/amdgpu.h
@@ -672,6 +672,30 @@ int amdgpu_create_bo_from_user_mem(amdgpu_device_handle dev,
 				    amdgpu_bo_handle *buf_handle);
 
 /**
+ * Validate if the user memory comes from BO
+ *
+ * \param dev - [in] Device handle. See #amdgpu_device_initialize()
+ * \param cpu - [in] CPU address of user allocated memory which we
+ * want to map to GPU address space (make GPU accessible)
+ * (This address must be correctly aligned).
+ * \param size - [in] Size of allocation (must be correctly aligned)
+ * \param buf_handle - [out] Buffer handle for the userptr memory
+ * if the user memory is not from BO, the buf_handle will be NULL.
+ * \param offset_in_bo - [out] offset in this BO for this user memory
+ *
+ *
+ * \return   0 on success\n
+ *          <0 - Negative POSIX Error code
+ *
+*/
+int amdgpu_find_bo_by_cpu_mapping(amdgpu_device_handle dev,
+				  void *cpu,
+				  uint64_t size,
+				  amdgpu_bo_handle *buf_handle,
+				  uint64_t *offset_in_bo);
+
+
+/**
  * Free previosuly allocated memory
  *
  * \param   dev	       - \c [in] Device handle. See #amdgpu_device_initialize()
diff --git a/amdgpu/amdgpu_bo.c b/amdgpu/amdgpu_bo.c
index 5a0f4ac..82659a4 100644
--- a/amdgpu/amdgpu_bo.c
+++ b/amdgpu/amdgpu_bo.c
@@ -528,6 +528,43 @@ int amdgpu_bo_wait_for_idle(amdgpu_bo_handle bo,
 	}
 }
 
+int amdgpu_find_bo_by_cpu_mapping(amdgpu_device_handle dev,
+				  void *cpu,
+				  uint64_t size,
+				  amdgpu_bo_handle *buf_handle,
+				  uint64_t *offset_in_bo)
+{
+	int r;
+	struct amdgpu_bo *bo;
+	struct drm_amdgpu_gem_find_bo args;
+
+	args.addr = (uintptr_t)cpu;
+	args.size = size;
+	r = drmCommandWriteRead(dev->fd, DRM_AMDGPU_GEM_FIND_BO,
+				&args, sizeof(args));
+	if (r)
+		return r;
+	if (args.handle == 0)
+		return -EINVAL;
+	bo = util_hash_table_get(dev->bo_handles,
+				 (void*)(uintptr_t)args.handle);
+	if (!bo) {
+		bo = calloc(1, sizeof(struct amdgpu_bo));
+		if (!bo)
+			return -ENOMEM;
+		atomic_set(&bo->refcount, 1);
+		bo->dev = dev;
+		bo->alloc_size = size;
+		bo->handle = args.handle;
+	} else
+		atomic_inc(&bo->refcount);
+
+	*buf_handle = bo;
+	*offset_in_bo = args.offset;
+	return r;
+}
+
+
 int amdgpu_create_bo_from_user_mem(amdgpu_device_handle dev,
 				    void *cpu,
 				    uint64_t size,
diff --git a/include/drm/amdgpu_drm.h b/include/drm/amdgpu_drm.h
index 050e7fe..e07904c 100644
--- a/include/drm/amdgpu_drm.h
+++ b/include/drm/amdgpu_drm.h
@@ -47,6 +47,7 @@
 #define DRM_AMDGPU_GEM_OP		0x10
 #define DRM_AMDGPU_GEM_USERPTR		0x11
 #define DRM_AMDGPU_WAIT_FENCES		0x12
+#define DRM_AMDGPU_GEM_FIND_BO          0x13
 
 #define DRM_IOCTL_AMDGPU_GEM_CREATE	DRM_IOWR(DRM_COMMAND_BASE + DRM_AMDGPU_GEM_CREATE, union drm_amdgpu_gem_create)
 #define DRM_IOCTL_AMDGPU_GEM_MMAP	DRM_IOWR(DRM_COMMAND_BASE + DRM_AMDGPU_GEM_MMAP, union drm_amdgpu_gem_mmap)
@@ -61,6 +62,7 @@
 #define DRM_IOCTL_AMDGPU_GEM_OP		DRM_IOWR(DRM_COMMAND_BASE + DRM_AMDGPU_GEM_OP, struct drm_amdgpu_gem_op)
 #define DRM_IOCTL_AMDGPU_GEM_USERPTR	DRM_IOWR(DRM_COMMAND_BASE + DRM_AMDGPU_GEM_USERPTR, struct drm_amdgpu_gem_userptr)
 #define DRM_IOCTL_AMDGPU_WAIT_FENCES	DRM_IOWR(DRM_COMMAND_BASE + DRM_AMDGPU_WAIT_FENCES, union drm_amdgpu_wait_fences)
+#define DRM_IOCTL_AMDGPU_GEM_FIND_BO      DRM_IOWR(DRM_COMMAND_BASE + DRM_AMDGPU_GEM_FIND_BO, struct drm_amdgpu_gem_find_bo)
 
 #define AMDGPU_GEM_DOMAIN_CPU		0x1
 #define AMDGPU_GEM_DOMAIN_GTT		0x2
@@ -201,6 +203,16 @@ struct drm_amdgpu_gem_userptr {
 	uint32_t		handle;
 };
 
+struct drm_amdgpu_gem_find_bo {
+       uint64_t                addr;
+       uint64_t                size;
+       uint32_t                flags;
+       /* Resulting GEM handle */
+       uint32_t                handle;
+       /* offset in bo */
+       uint64_t                offset;
+};
+
 /* same meaning as the GB_TILE_MODE and GL_MACRO_TILE_MODE fields */
 #define AMDGPU_TILING_ARRAY_MODE_SHIFT			0
 #define AMDGPU_TILING_ARRAY_MODE_MASK			0xf
-- 
1.9.1

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