/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) Rockchip Electronics Co.Ltd
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* Author: Felix Zeng <felix.zeng@rock-chips.com>
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*/
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#ifndef __LINUX_RKNPU_GEM_H
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#define __LINUX_RKNPU_GEM_H
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#include <linux/mm_types.h>
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#include <linux/version.h>
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#include <drm/drm_device.h>
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#include <drm/drm_vma_manager.h>
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#include <drm/drm_gem.h>
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#include <drm/drm_mode.h>
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#if KERNEL_VERSION(4, 14, 0) > LINUX_VERSION_CODE
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#include <drm/drm_mem_util.h>
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#endif
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#include "rknpu_mm.h"
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#define to_rknpu_obj(x) container_of(x, struct rknpu_gem_object, base)
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/*
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* rknpu drm buffer structure.
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*
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* @base: a gem object.
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* - a new handle to this gem object would be created
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* by drm_gem_handle_create().
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* @flags: indicate memory type to allocated buffer and cache attribute.
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* @size: size requested from user, in bytes and this size is aligned
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* in page unit.
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* @cookie: cookie returned by dma_alloc_attrs
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* @kv_addr: kernel virtual address to allocated memory region.
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* @dma_addr: bus address(accessed by dma) to allocated memory region.
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* - this address could be physical address without IOMMU and
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* device address with IOMMU.
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* @pages: Array of backing pages.
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* @sgt: Imported sg_table.
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*
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* P.S. this object would be transferred to user as kms_bo.handle so
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* user can access the buffer through kms_bo.handle.
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*/
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struct rknpu_gem_object {
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struct drm_gem_object base;
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unsigned int flags;
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unsigned long size;
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unsigned long sram_size;
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struct rknpu_mm_obj *sram_obj;
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dma_addr_t iova_start;
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unsigned long iova_size;
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void *cookie;
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void __iomem *kv_addr;
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dma_addr_t dma_addr;
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unsigned long dma_attrs;
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unsigned long num_pages;
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struct page **pages;
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struct sg_table *sgt;
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struct drm_mm_node mm_node;
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};
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/* create a new buffer with gem object */
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struct rknpu_gem_object *rknpu_gem_object_create(struct drm_device *dev,
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unsigned int flags,
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unsigned long size,
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unsigned long sram_size);
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/* destroy a buffer with gem object */
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void rknpu_gem_object_destroy(struct rknpu_gem_object *rknpu_obj);
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/* request gem object creation and buffer allocation as the size */
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int rknpu_gem_create_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_priv);
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/* get fake-offset of gem object that can be used with mmap. */
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int rknpu_gem_map_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_priv);
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int rknpu_gem_destroy_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_priv);
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/*
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* get rknpu drm object,
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* gem object reference count would be increased.
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*/
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static inline void rknpu_gem_object_get(struct drm_gem_object *obj)
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{
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#if KERNEL_VERSION(4, 13, 0) < LINUX_VERSION_CODE
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drm_gem_object_get(obj);
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#else
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drm_gem_object_reference(obj);
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#endif
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}
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/*
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* put rknpu drm object acquired from rknpu_gem_object_find() or rknpu_gem_object_get(),
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* gem object reference count would be decreased.
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*/
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static inline void rknpu_gem_object_put(struct drm_gem_object *obj)
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{
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#if KERNEL_VERSION(5, 9, 0) <= LINUX_VERSION_CODE
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drm_gem_object_put(obj);
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#elif KERNEL_VERSION(4, 13, 0) < LINUX_VERSION_CODE
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drm_gem_object_put_unlocked(obj);
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#else
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drm_gem_object_unreference_unlocked(obj);
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#endif
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}
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/*
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* get rknpu drm object from gem handle, this function could be used for
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* other drivers such as 2d/3d acceleration drivers.
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* with this function call, gem object reference count would be increased.
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*/
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static inline struct rknpu_gem_object *
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rknpu_gem_object_find(struct drm_file *filp, unsigned int handle)
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{
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struct drm_gem_object *obj;
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obj = drm_gem_object_lookup(filp, handle);
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if (!obj) {
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// DRM_ERROR("failed to lookup gem object.\n");
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return NULL;
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}
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rknpu_gem_object_put(obj);
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return to_rknpu_obj(obj);
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}
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/* get buffer information to memory region allocated by gem. */
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int rknpu_gem_get_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_priv);
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/* free gem object. */
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void rknpu_gem_free_object(struct drm_gem_object *obj);
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/* create memory region for drm framebuffer. */
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int rknpu_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev,
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struct drm_mode_create_dumb *args);
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#if KERNEL_VERSION(4, 19, 0) > LINUX_VERSION_CODE
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/* map memory region for drm framebuffer to user space. */
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int rknpu_gem_dumb_map_offset(struct drm_file *file_priv,
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struct drm_device *dev, uint32_t handle,
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uint64_t *offset);
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#endif
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/* page fault handler and mmap fault address(virtual) to physical memory. */
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#if KERNEL_VERSION(4, 15, 0) <= LINUX_VERSION_CODE
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vm_fault_t rknpu_gem_fault(struct vm_fault *vmf);
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#elif KERNEL_VERSION(4, 14, 0) <= LINUX_VERSION_CODE
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int rknpu_gem_fault(struct vm_fault *vmf);
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#else
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int rknpu_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf);
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#endif
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/* set vm_flags and we can change the vm attribute to other one at here. */
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int rknpu_gem_mmap(struct file *filp, struct vm_area_struct *vma);
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/* low-level interface prime helpers */
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#if KERNEL_VERSION(4, 13, 0) <= LINUX_VERSION_CODE
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struct drm_gem_object *rknpu_gem_prime_import(struct drm_device *dev,
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struct dma_buf *dma_buf);
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#endif
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struct sg_table *rknpu_gem_prime_get_sg_table(struct drm_gem_object *obj);
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struct drm_gem_object *
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rknpu_gem_prime_import_sg_table(struct drm_device *dev,
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struct dma_buf_attachment *attach,
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struct sg_table *sgt);
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void *rknpu_gem_prime_vmap(struct drm_gem_object *obj);
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void rknpu_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr);
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int rknpu_gem_prime_mmap(struct drm_gem_object *obj,
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struct vm_area_struct *vma);
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int rknpu_gem_sync_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_priv);
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static inline void *rknpu_gem_alloc_page(size_t nr_pages)
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{
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#if KERNEL_VERSION(4, 13, 0) <= LINUX_VERSION_CODE
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return kvmalloc_array(nr_pages, sizeof(struct page *),
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GFP_KERNEL | __GFP_ZERO);
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#else
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return drm_calloc_large(nr_pages, sizeof(struct page *));
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#endif
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}
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static inline void rknpu_gem_free_page(void *pages)
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{
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#if KERNEL_VERSION(4, 13, 0) <= LINUX_VERSION_CODE
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kvfree(pages);
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#else
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drm_free_large(pages);
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#endif
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}
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#endif
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