Add samsung specific changes

include/linux/qtee_shmbridge.h

@@ -0,0 +1,113 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2019, 2021 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#ifndef __QTEE_SHMBRIDGE_H__
+#define __QTEE_SHMBRIDGE_H__
+
+/* VMID and permission definitions */
+#include <soc/qcom/secure_buffer.h>
+
+/**
+ * struct qtee_shm - info of shared memory allocated from the default bridge
+ * @ paddr: physical address of the shm allocated from the default bridge
+ * @ vaddr: virtual address of the shm
+ * @ size: size of the shm
+ */
+struct qtee_shm {
+	phys_addr_t paddr;
+	void *vaddr;
+	size_t size;
+};
+
+/**
+ * Check whether shmbridge mechanism is enabled in HYP or not
+ *
+ * return true when enabled, false when not enabled
+ */
+bool qtee_shmbridge_is_enabled(void);
+
+/**
+ * Check whether a bridge starting from paddr exists
+ *
+ * @ [IN] paddr: physical addr of the buffer
+ *
+ * return 0 or -EEXIST
+ */
+int32_t qtee_shmbridge_query(phys_addr_t paddr);
+
+/**
+ * Register paddr & size as a bridge, get bridge handle
+ *
+ * @ [IN] paddr: physical addr of the buffer to be turned into bridge
+ * @ [IN] size: size of the bridge
+ * @ [IN] ns_vmid_list: non-secure vmids array
+ * @ [IN] ns_vm_perm_list: NS VM permission array
+ * @ [IN] ns_vmid_num: number of NS VMIDs (at most 4)
+ * @ [IN] tz_perm: TZ permission
+ * @ [OUT] *handle: output shmbridge handle
+ *
+ * return success or error
+ */
+int32_t qtee_shmbridge_register(
+		phys_addr_t paddr,
+		size_t size,
+		uint32_t *ns_vmid_list,
+		uint32_t *ns_vm_perm_list,
+		uint32_t ns_vmid_num,
+		uint32_t tz_perm,
+		uint64_t *handle);
+
+/**
+ * Deregister bridge
+ *
+ * @ [IN] handle: shmbridge handle
+ *
+ * return success or error
+ */
+int32_t qtee_shmbridge_deregister(uint64_t handle);
+
+/**
+ * Sub-allocate from default kernel bridge created by shmb driver
+ *
+ * @ [IN] size: size of the buffer to be sub-allocated from the bridge
+ * @ [OUT] *shm: output qtee_shm structure with buffer paddr, vaddr and
+ *         size; returns ERR_PTR or NULL otherwise
+ *
+ * return success or error
+ *
+ * Note: This will allocate a cached buffer, so after a client allocates
+ *       a bridge buffer, it need to first flush cache with
+ *       "qtee_shmbridge_flush_shm_buf" before invoke scm_call to TZ,
+ *       and then invalidate cache with "qtee_shmbridge_inv_shm_buf"
+ *       after scm_call return.
+ */
+int32_t qtee_shmbridge_allocate_shm(size_t size, struct qtee_shm *shm);
+
+/*
+ * Free buffer that is sub-allocated from default kernel bridge
+ *
+ * @ [IN] shm: qtee_shm structure to be freed
+ *
+ */
+void qtee_shmbridge_free_shm(struct qtee_shm *shm);
+
+/*
+ * cache clean operation for buffer sub-allocated from default bridge
+ *
+ * @ [IN] shm: qtee_shm, its cache to be cleaned
+ *
+ */
+void qtee_shmbridge_flush_shm_buf(struct qtee_shm *shm);
+
+/*
+ * cache invalidation operation for buffer sub-allocated from default bridge
+ *
+ * @ [IN] shm: qtee_shm, its cache to be invalidated
+ *
+ */
+void qtee_shmbridge_inv_shm_buf(struct qtee_shm *shm);
+
+#endif /*__QTEE_SHMBRIDGE_H__*/