Add samsung specific changes

include/linux/mem-buf-exporter.h

@@ -0,0 +1,120 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ *  Copyright (c) 2020-2021, The Linux Foundation. All rights reserved.
+ *  Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#ifndef _MEM_BUF_EXPORTER_H
+#define _MEM_BUF_EXPORTER_H
+
+#include <linux/dma-buf.h>
+#include <linux/gunyah/gh_rm_drv.h>
+#include <soc/qcom/secure_buffer.h>
+
+int mem_buf_dma_buf_attach(struct dma_buf *dmabuf,
+		      struct dma_buf_attachment *attachment);
+
+/* Private data for managing a dmabuf's Virtual Machine permissions. */
+struct mem_buf_vmperm;
+
+/*
+ * @lookup: Returns the mem_buf_vmperm data structure contained somewhere
+ * in the exporter's private_data, or a negative number on error.
+ * @attach: The exporter's normal dma_buf_attach callback
+ * @dma_ops: The exporter's standard dma_buf callbacks, except for
+ * attach which must be NULL.
+ */
+struct mem_buf_dma_buf_ops {
+	struct mem_buf_vmperm *(*lookup)(struct dma_buf *dmabuf);
+	int (*attach)(struct dma_buf *dmabuf, struct dma_buf_attachment *a);
+	struct dma_buf_ops dma_ops;
+};
+
+struct dma_buf *
+mem_buf_dma_buf_export(struct dma_buf_export_info *exp_info,
+			struct mem_buf_dma_buf_ops *ops);
+
+
+#define MEM_BUF_WRAPPER_FLAG_STATIC_VM BIT(0)
+#define MEM_BUF_WRAPPER_FLAG_LENDSHARE BIT(1)
+#define MEM_BUF_WRAPPER_FLAG_ACCEPT BIT(2)
+#define MEM_BUF_WRAPPER_FLAG_ERR BIT(3)
+
+/*
+ * A dmabuf owned by the current VM with RWX permissions.
+ * All variants should be free'd via mem_buf_vmperm_free().
+ *
+ * @dmabuf: value returned from dma_buf_export()
+ * @sgt: Reference to the exporter's internal memory descriptor.
+ * Will not be freed by mem_buf_vmperm_free().
+ */
+struct mem_buf_vmperm *mem_buf_vmperm_alloc(struct sg_table *sgt);
+
+/*
+ * A dmabuf which permantently belongs to the given VMs & permissions.
+ */
+struct mem_buf_vmperm *mem_buf_vmperm_alloc_staticvm(struct sg_table *sgt, int *vmids, int *perms,
+		u32 nr_acl_entries);
+
+/*
+ * A dmabuf in the "MEMACCEPT" state.
+ */
+struct mem_buf_vmperm *mem_buf_vmperm_alloc_accept(struct sg_table *sgt,
+	gh_memparcel_handle_t memparcel_hdl, int *vmids, int *perms,
+	unsigned int nr_acl_entries);
+
+/*
+ * Performs the expected close step based on whether the dmabuf
+ * is of the "STATICVM" "MEMACCEPT" or "DEFAULT" type.
+ * Exporters should call this from dma_buf_release. If this function
+ * Returns an error, exporters should consider the underlying memory
+ * to have undefined permissions.
+ */
+int mem_buf_vmperm_release(struct mem_buf_vmperm *vmperm);
+
+/*
+ * Pins ths permissions of the dmabuf.
+ * The exporter should call this from dma_buf_mmap, vm_ops->open(), and
+ * dma_buf_map_attachment. It must not be called from
+ * dma_buf_begin_cpu_access as userspace may call this function unsafely
+ * via DMA_BUF_IOCTL_SYNC.
+ */
+void mem_buf_vmperm_pin(struct mem_buf_vmperm *vmperm);
+
+/*
+ * Unpins ths permissions of the dmabuf.
+ * The exporter should call this from vm_ops->close(), and
+ * dma_buf_unmap_attachment. It must not be called from
+ * dma_buf_end_cpu_access as userspace may call this function unsafely
+ * via DMA_BUF_IOCTL_SYNC.
+ */
+void mem_buf_vmperm_unpin(struct mem_buf_vmperm *vmperm);
+
+/*
+ * Check whether the current permissions of the dmabuf allow CMO.
+ * Requires RW.
+ *
+ * The exporter should call this during dma_buf_map/unmap_attachment,
+ * and dma_buf_begin/end_cpu_access.
+ */
+bool mem_buf_vmperm_can_cmo(struct mem_buf_vmperm *vmperm);
+
+/*
+ * Check whether the current permissions of the dmabuf allow mmap.
+ * Requires at minimum the permissions specified in vma.
+ *
+ * The exporter should call mem_buf_vmperm_pin() from mmap.
+ * The exporter should implement the open() and close() operations of
+ * vma->vm_ops, and call mem_buf_vmperm_pin()/unpin() respectively.
+ */
+bool mem_buf_vmperm_can_mmap(struct mem_buf_vmperm *vmperm, struct vm_area_struct *vma);
+
+/*
+ * Check whether the current permissions of the dmabuf allow vmap.
+ * Requires RW.
+ *
+ * The exporter should call this during dma_buf_vmap,
+ */
+bool mem_buf_vmperm_can_vmap(struct mem_buf_vmperm *vmperm);
+
+#endif /*_MEM_BUF_EXPORTER_H */