1 files changed, 148 insertions, 0 deletions

diff --git a/include/nvgpu/vidmem.h b/include/nvgpu/vidmem.h
new file mode 100644
index 0000000..4470232
--- /dev/null
+++ b/include/nvgpu/vidmem.h
@@ -0,0 +1,148 @@
+/*
+ * Copyright (c) 2017-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef NVGPU_VIDMEM_H
+#define NVGPU_VIDMEM_H
+
+#include <nvgpu/types.h>
+#include <nvgpu/errno.h>
+
+struct gk20a;
+struct mm_gk20a;
+struct nvgpu_mem;
+
+struct nvgpu_vidmem_buf {
+        /*
+         * Must be a pointer since control of this mem is passed over to the
+         * vidmem background clearing thread when the vidmem buf is freed.
+         */
+        struct nvgpu_mem        *mem;
+
+        struct gk20a            *g;
+
+        /*
+         * Filled in by each OS - this holds the necessary data to export this
+         * buffer to userspace. This will eventually be replaced by a struct
+         * which shall be defined in the OS specific vidmem.h header file.
+         */
+        void                    *priv;
+};
+
+#if defined(CONFIG_GK20A_VIDMEM)
+
+/**
+ * nvgpu_vidmem_user_alloc - Allocates a vidmem buffer for userspace
+ *
+ * @g     - The GPU.
+ * @bytes - Size of the buffer in bytes.
+ *
+ * Allocate a generic (OS agnostic) vidmem buffer. This does not allocate the OS
+ * specific interfacing for userspace sharing. Instead is is expected that the
+ * OS specific code will allocate that OS specific data and add it to this
+ * buffer.
+ *
+ * The buffer allocated here is intended to use used by userspace, hence the
+ * extra struct over nvgpu_mem. If a vidmem buffer is needed by the kernel
+ * driver only then a simple nvgpu_dma_alloc_vid() or the like is sufficient.
+ *
+ * Returns a pointer to a vidmem buffer on success, 0 otherwise.
+ */
+struct nvgpu_vidmem_buf *nvgpu_vidmem_user_alloc(struct gk20a *g, size_t bytes);
+
+void nvgpu_vidmem_buf_free(struct gk20a *g, struct nvgpu_vidmem_buf *buf);
+
+int nvgpu_vidmem_clear_list_enqueue(struct gk20a *g, struct nvgpu_mem *mem);
+
+bool nvgpu_addr_is_vidmem_page_alloc(u64 addr);
+int nvgpu_vidmem_get_space(struct gk20a *g, u64 *space);
+
+void nvgpu_vidmem_destroy(struct gk20a *g);
+int nvgpu_vidmem_init(struct mm_gk20a *mm);
+
+int nvgpu_vidmem_clear(struct gk20a *g, struct nvgpu_mem *mem);
+
+void nvgpu_vidmem_thread_pause_sync(struct mm_gk20a *mm);
+void nvgpu_vidmem_thread_unpause(struct mm_gk20a *mm);
+
+#else /* !defined(CONFIG_GK20A_VIDMEM) */
+
+/*
+ * When VIDMEM support is not present this interface is used.
+ */
+
+static inline bool nvgpu_addr_is_vidmem_page_alloc(u64 addr)
+{
+        return false;
+}
+
+static inline int nvgpu_vidmem_buf_alloc(struct gk20a *g, size_t bytes)
+{
+        return -ENOSYS;
+}
+
+static inline void nvgpu_vidmem_buf_free(struct gk20a *g,
+                                         struct nvgpu_vidmem_buf *buf)
+{
+}
+
+static inline int nvgpu_vidmem_get_space(struct gk20a *g, u64 *space)
+{
+        return -ENOSYS;
+}
+
+static inline void nvgpu_vidmem_destroy(struct gk20a *g)
+{
+}
+
+static inline int nvgpu_vidmem_init(struct mm_gk20a *mm)
+{
+        return 0;
+}
+
+static inline int nvgpu_vidmem_clear_all(struct gk20a *g)
+{
+        return -ENOSYS;
+}
+
+static inline int nvgpu_vidmem_clear(struct gk20a *g,
+                                              struct nvgpu_mem *mem)
+{
+        return -ENOSYS;
+}
+
+static inline void nvgpu_vidmem_thread_pause_sync(struct mm_gk20a *mm)
+{
+}
+
+static inline void nvgpu_vidmem_thread_unpause(struct mm_gk20a *mm)
+{
+}
+
+#endif /* !defined(CONFIG_GK20A_VIDMEM) */
+
+/*
+ * Simple macro for VIDMEM debugging.
+ */
+#define vidmem_dbg(g, fmt, args...)                     \
+        nvgpu_log(g, gpu_dbg_vidmem, fmt, ##args);      \
+
+#endif /* NVGPU_VIDMEM_H */