mirror of https://github.com/OpenIPC/firmware.git
172 lines
6.3 KiB
Diff
172 lines
6.3 KiB
Diff
diff -drupN a/drivers/android/binder_alloc.h b/drivers/android/binder_alloc.h
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--- a/drivers/android/binder_alloc.h 1970-01-01 03:00:00.000000000 +0300
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+++ b/drivers/android/binder_alloc.h 2022-06-12 05:28:14.000000000 +0300
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@@ -0,0 +1,167 @@
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+/*
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+ * Copyright (C) 2017 Google, Inc.
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+ *
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+ * This software is licensed under the terms of the GNU General Public
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+ * License version 2, as published by the Free Software Foundation, and
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+ * may be copied, distributed, and modified under those terms.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ */
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+
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+#ifndef _LINUX_BINDER_ALLOC_H
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+#define _LINUX_BINDER_ALLOC_H
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+
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+#include <linux/rbtree.h>
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+#include <linux/list.h>
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+#include <linux/mm.h>
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+#include <linux/rtmutex.h>
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+#include <linux/vmalloc.h>
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+#include <linux/slab.h>
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+
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+struct binder_transaction;
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+
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+/**
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+ * struct binder_buffer - buffer used for binder transactions
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+ * @entry: entry alloc->buffers
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+ * @rb_node: node for allocated_buffers/free_buffers rb trees
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+ * @free: true if buffer is free
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+ * @allow_user_free: describe the second member of struct blah,
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+ * @async_transaction: describe the second member of struct blah,
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+ * @debug_id: describe the second member of struct blah,
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+ * @transaction: describe the second member of struct blah,
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+ * @target_node: describe the second member of struct blah,
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+ * @data_size: describe the second member of struct blah,
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+ * @offsets_size: describe the second member of struct blah,
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+ * @extra_buffers_size: describe the second member of struct blah,
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+ * @data:i describe the second member of struct blah,
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+ *
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+ * Bookkeeping structure for binder transaction buffers
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+ */
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+struct binder_buffer {
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+ struct list_head entry; /* free and allocated entries by address */
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+ struct rb_node rb_node; /* free entry by size or allocated entry */
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+ /* by address */
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+ unsigned free:1;
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+ unsigned allow_user_free:1;
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+ unsigned async_transaction:1;
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+ unsigned debug_id:29;
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+
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+ struct binder_transaction *transaction;
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+
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+ struct binder_node *target_node;
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+ size_t data_size;
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+ size_t offsets_size;
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+ size_t extra_buffers_size;
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+ void *data;
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+};
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+
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+/**
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+ * struct binder_alloc - per-binder proc state for binder allocator
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+ * @vma: vm_area_struct passed to mmap_handler
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+ * (invarient after mmap)
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+ * @tsk: tid for task that called init for this proc
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+ * (invariant after init)
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+ * @vma_vm_mm: copy of vma->vm_mm (invarient after mmap)
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+ * @buffer: base of per-proc address space mapped via mmap
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+ * @user_buffer_offset: offset between user and kernel VAs for buffer
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+ * @buffers: list of all buffers for this proc
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+ * @free_buffers: rb tree of buffers available for allocation
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+ * sorted by size
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+ * @allocated_buffers: rb tree of allocated buffers sorted by address
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+ * @free_async_space: VA space available for async buffers. This is
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+ * initialized at mmap time to 1/2 the full VA space
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+ * @pages: array of physical page addresses for each
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+ * page of mmap'd space
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+ * @buffer_size: size of address space specified via mmap
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+ * @pid: pid for associated binder_proc (invariant after init)
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+ *
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+ * Bookkeeping structure for per-proc address space management for binder
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+ * buffers. It is normally initialized during binder_init() and binder_mmap()
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+ * calls. The address space is used for both user-visible buffers and for
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+ * struct binder_buffer objects used to track the user buffers
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+ */
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+struct binder_alloc {
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+ struct mutex mutex;
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+ struct task_struct *tsk;
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+ struct vm_area_struct *vma;
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+ struct mm_struct *vma_vm_mm;
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+ void *buffer;
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+ ptrdiff_t user_buffer_offset;
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+ struct list_head buffers;
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+ struct rb_root free_buffers;
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+ struct rb_root allocated_buffers;
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+ size_t free_async_space;
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+ struct page **pages;
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+ size_t buffer_size;
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+ uint32_t buffer_free;
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+ int pid;
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+};
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+
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+#ifdef CONFIG_ANDROID_BINDER_IPC_SELFTEST
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+void binder_selftest_alloc(struct binder_alloc *alloc);
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+#else
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+static inline void binder_selftest_alloc(struct binder_alloc *alloc) {}
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+#endif
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+extern struct binder_buffer *binder_alloc_new_buf(struct binder_alloc *alloc,
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+ size_t data_size,
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+ size_t offsets_size,
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+ size_t extra_buffers_size,
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+ int is_async);
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+extern void binder_alloc_init(struct binder_alloc *alloc);
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+extern void binder_alloc_vma_close(struct binder_alloc *alloc);
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+extern struct binder_buffer *
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+binder_alloc_prepare_to_free(struct binder_alloc *alloc,
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+ uintptr_t user_ptr);
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+extern void binder_alloc_free_buf(struct binder_alloc *alloc,
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+ struct binder_buffer *buffer);
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+extern int binder_alloc_mmap_handler(struct binder_alloc *alloc,
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+ struct vm_area_struct *vma);
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+extern void binder_alloc_deferred_release(struct binder_alloc *alloc);
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+extern int binder_alloc_get_allocated_count(struct binder_alloc *alloc);
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+extern void binder_alloc_print_allocated(struct seq_file *m,
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+ struct binder_alloc *alloc);
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+
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+/**
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+ * binder_alloc_get_free_async_space() - get free space available for async
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+ * @alloc: binder_alloc for this proc
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+ *
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+ * Return: the bytes remaining in the address-space for async transactions
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+ */
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+static inline size_t
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+binder_alloc_get_free_async_space(struct binder_alloc *alloc)
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+{
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+ size_t free_async_space;
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+
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+ mutex_lock(&alloc->mutex);
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+ free_async_space = alloc->free_async_space;
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+ mutex_unlock(&alloc->mutex);
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+ return free_async_space;
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+}
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+
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+/**
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+ * binder_alloc_get_user_buffer_offset() - get offset between kernel/user addrs
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+ * @alloc: binder_alloc for this proc
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+ *
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+ * Return: the offset between kernel and user-space addresses to use for
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+ * virtual address conversion
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+ */
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+static inline ptrdiff_t
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+binder_alloc_get_user_buffer_offset(struct binder_alloc *alloc)
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+{
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+ /*
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+ * user_buffer_offset is constant if vma is set and
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+ * undefined if vma is not set. It is possible to
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+ * get here with !alloc->vma if the target process
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+ * is dying while a transaction is being initiated.
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+ * Returning the old value is ok in this case and
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+ * the transaction will fail.
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+ */
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+ return alloc->user_buffer_offset;
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+}
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+
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+#endif /* _LINUX_BINDER_ALLOC_H */
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+
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