Add samsung specific changes

include/linux/mem-buf.h

@@ -0,0 +1,139 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ *  Copyright (c) 2020-2021, The Linux Foundation. All rights reserved.
+ *  Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#ifndef _MEM_BUF_H
+#define _MEM_BUF_H
+
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/gunyah/gh_rm_drv.h>
+#include <linux/types.h>
+#include <linux/dma-buf.h>
+#include <uapi/linux/mem-buf.h>
+
+/* For in-kernel use only, not allowed for userspace ioctl */
+#define MEM_BUF_BUDDY_MEM_TYPE (MEM_BUF_ION_MEM_TYPE + 2)
+
+/* Used to obtain the underlying vmperm struct of a DMA-BUF */
+struct mem_buf_vmperm *to_mem_buf_vmperm(struct dma_buf *dmabuf);
+
+/* Returns true if the local VM has exclusive access and is the owner */
+bool mem_buf_dma_buf_exclusive_owner(struct dma_buf *dmabuf);
+
+/*
+ * Returns the Virtual Machine vmids & permissions of the dmabuf. Can't be
+ * modified.
+ */
+int mem_buf_dma_buf_get_vmperm(struct dma_buf *dmabuf, const int **vmids,
+		const int **perms, int *nr_acl_entries);
+/*
+ * Returns a copy of the Virtual Machine vmids & permissions of the dmabuf.
+ * The caller must kfree() when finished.
+ */
+int mem_buf_dma_buf_copy_vmperm(struct dma_buf *dmabuf, int **vmids, int **perms,
+		int *nr_acl_entries);
+
+/*
+ * Returns 0 if @dmabuf has a valid memparcel handle and stores it in
+ * memparcel_hdl
+ */
+int mem_buf_dma_buf_get_memparcel_hdl(struct dma_buf *dmabuf,
+				      gh_memparcel_handle_t *memparcel_hdl);
+
+typedef int (*mem_buf_dma_buf_destructor)(void *dtor_data);
+int mem_buf_dma_buf_set_destructor(struct dma_buf *dmabuf,
+				   mem_buf_dma_buf_destructor dtor,
+				   void *dtor_data);
+
+/**
+ * struct mem_buf_allocation_data - Data structure that contains information
+ * about a memory buffer allocation request.
+ * @size: The size (in bytes) of the memory to be requested from a remote VM
+ * @nr_acl_entries: The number of ACL entries in @acl_list
+ * @acl_list: A list of VMID and permission pairs that describe what VMIDs will
+ * have access to the memory, and with what permissions
+ * @trans_type: One of GH_RM_TRANS_TYPE_DONATE/LEND/SHARE
+ * @sgl_desc: Optional. Requests a specific set of IPA addresses.
+ * @src_mem_type: The type of memory that the remote VM should allocate
+ * (e.g. ION memory)
+ * @src_data: A pointer to memory type specific data that the remote VM may need
+ * when performing an allocation (e.g. ION memory allocations require a heap ID)
+ * @dst_mem_type: The type of memory that the native VM wants (e.g. ION memory)
+ * @dst_data: A pointer to memory type specific data that the native VM may
+ * need when adding the memory from the remote VM (e.g. ION memory requires a
+ * heap ID to add the memory to).
+ */
+struct mem_buf_allocation_data {
+	size_t size;
+	unsigned int nr_acl_entries;
+	int *vmids;
+	int *perms;
+	u32 trans_type;
+	struct gh_sgl_desc *sgl_desc;
+	enum mem_buf_mem_type src_mem_type;
+	void *src_data;
+	enum mem_buf_mem_type dst_mem_type;
+	void *dst_data;
+};
+
+struct mem_buf_lend_kernel_arg {
+	unsigned int nr_acl_entries;
+	int *vmids;
+	int *perms;
+	gh_memparcel_handle_t memparcel_hdl;
+	u32 flags;
+	u64 label;
+};
+
+int mem_buf_lend(struct dma_buf *dmabuf,
+		struct mem_buf_lend_kernel_arg *arg);
+
+/*
+ * mem_buf_share
+ * Grant the local VM, as well as one or more remote VMs access
+ * to the dmabuf. The permissions of the local VM default to RWX
+ * unless otherwise specified.
+ */
+int mem_buf_share(struct dma_buf *dmabuf,
+		struct mem_buf_lend_kernel_arg *arg);
+
+
+struct mem_buf_retrieve_kernel_arg {
+	int sender_vmid;
+	unsigned int nr_acl_entries;
+	int *vmids;
+	int *perms;
+	gh_memparcel_handle_t memparcel_hdl;
+	int fd_flags;
+};
+struct dma_buf *mem_buf_retrieve(struct mem_buf_retrieve_kernel_arg *arg);
+int mem_buf_reclaim(struct dma_buf *dmabuf);
+
+#if IS_ENABLED(CONFIG_QCOM_MEM_BUF)
+
+void *mem_buf_alloc(struct mem_buf_allocation_data *alloc_data);
+void mem_buf_free(void *membuf);
+struct gh_sgl_desc *mem_buf_get_sgl(void *membuf);
+int mem_buf_current_vmid(void);
+#else
+
+static inline void *mem_buf_alloc(struct mem_buf_allocation_data *alloc_data)
+{
+	return ERR_PTR(-ENODEV);
+}
+
+static inline void mem_buf_free(void *membuf) {}
+
+static inline struct gh_sgl_desc *mem_buf_get_sgl(void *membuf)
+{
+	return ERR_PTR(-EINVAL);
+}
+static inline int mem_buf_current_vmid(void)
+{
+	return -EINVAL;
+}
+#endif /* CONFIG_QCOM_MEM_BUF */
+#endif /* _MEM_BUF_H */