drm_gem_cma_helper.h revision 1.1
1 /* $NetBSD: drm_gem_cma_helper.h,v 1.1 2021/12/19 10:24:33 riastradh Exp $ */ 2 3 /* SPDX-License-Identifier: GPL-2.0 */ 4 #ifndef __DRM_GEM_CMA_HELPER_H__ 5 #define __DRM_GEM_CMA_HELPER_H__ 6 7 #include <drm/drm_file.h> 8 #include <drm/drm_ioctl.h> 9 #include <drm/drm_gem.h> 10 11 struct drm_mode_create_dumb; 12 13 /** 14 * struct drm_gem_cma_object - GEM object backed by CMA memory allocations 15 * @base: base GEM object 16 * @paddr: physical address of the backing memory 17 * @sgt: scatter/gather table for imported PRIME buffers. The table can have 18 * more than one entry but they are guaranteed to have contiguous 19 * DMA addresses. 20 * @vaddr: kernel virtual address of the backing memory 21 */ 22 struct drm_gem_cma_object { 23 struct drm_gem_object base; 24 #ifdef __NetBSD__ 25 bus_dma_tag_t dmat; 26 bus_dma_segment_t dmasegs[1]; 27 bus_size_t dmasize; 28 bus_dmamap_t dmamap; 29 vmem_t *vmem_pool; 30 vmem_addr_t vmem_addr; 31 #else 32 dma_addr_t paddr; 33 #endif 34 struct sg_table *sgt; 35 36 /* For objects with DMA memory allocated by GEM CMA */ 37 void *vaddr; 38 }; 39 40 #define to_drm_gem_cma_obj(gem_obj) \ 41 container_of(gem_obj, struct drm_gem_cma_object, base) 42 43 #ifndef CONFIG_MMU 44 #define DRM_GEM_CMA_UNMAPPED_AREA_FOPS \ 45 .get_unmapped_area = drm_gem_cma_get_unmapped_area, 46 #else 47 #define DRM_GEM_CMA_UNMAPPED_AREA_FOPS 48 #endif 49 50 /** 51 * DEFINE_DRM_GEM_CMA_FOPS() - macro to generate file operations for CMA drivers 52 * @name: name for the generated structure 53 * 54 * This macro autogenerates a suitable &struct file_operations for CMA based 55 * drivers, which can be assigned to &drm_driver.fops. Note that this structure 56 * cannot be shared between drivers, because it contains a reference to the 57 * current module using THIS_MODULE. 58 * 59 * Note that the declaration is already marked as static - if you need a 60 * non-static version of this you're probably doing it wrong and will break the 61 * THIS_MODULE reference by accident. 62 */ 63 #define DEFINE_DRM_GEM_CMA_FOPS(name) \ 64 static const struct file_operations name = {\ 65 .owner = THIS_MODULE,\ 66 .open = drm_open,\ 67 .release = drm_release,\ 68 .unlocked_ioctl = drm_ioctl,\ 69 .compat_ioctl = drm_compat_ioctl,\ 70 .poll = drm_poll,\ 71 .read = drm_read,\ 72 .llseek = noop_llseek,\ 73 .mmap = drm_gem_cma_mmap,\ 74 DRM_GEM_CMA_UNMAPPED_AREA_FOPS \ 75 } 76 77 /* free GEM object */ 78 void drm_gem_cma_free_object(struct drm_gem_object *gem_obj); 79 80 /* create memory region for DRM framebuffer */ 81 int drm_gem_cma_dumb_create_internal(struct drm_file *file_priv, 82 struct drm_device *drm, 83 struct drm_mode_create_dumb *args); 84 85 /* create memory region for DRM framebuffer */ 86 int drm_gem_cma_dumb_create(struct drm_file *file_priv, 87 struct drm_device *drm, 88 struct drm_mode_create_dumb *args); 89 90 /* set vm_flags and we can change the VM attribute to other one at here */ 91 #ifndef __NetBSD__ 92 int drm_gem_cma_mmap(struct file *filp, struct vm_area_struct *vma); 93 #endif 94 95 /* allocate physical memory */ 96 struct drm_gem_cma_object *drm_gem_cma_create(struct drm_device *drm, 97 size_t size); 98 99 #ifdef __NetBSD__ 100 extern const struct uvm_pagerops drm_gem_cma_uvm_ops; 101 #else 102 extern const struct vm_operations_struct drm_gem_cma_vm_ops; 103 #endif 104 105 #ifndef CONFIG_MMU 106 unsigned long drm_gem_cma_get_unmapped_area(struct file *filp, 107 unsigned long addr, 108 unsigned long len, 109 unsigned long pgoff, 110 unsigned long flags); 111 #endif 112 113 void drm_gem_cma_print_info(struct drm_printer *p, unsigned int indent, 114 const struct drm_gem_object *obj); 115 116 struct sg_table *drm_gem_cma_prime_get_sg_table(struct drm_gem_object *obj); 117 struct drm_gem_object * 118 drm_gem_cma_prime_import_sg_table(struct drm_device *dev, 119 struct dma_buf_attachment *attach, 120 struct sg_table *sgt); 121 #ifdef __NetBSD__ 122 int drm_gem_cma_prime_mmap(struct drm_gem_object *, off_t *, size_t, int, 123 int *, int *, struct uvm_object **, int *); 124 #else 125 int drm_gem_cma_prime_mmap(struct drm_gem_object *obj, 126 struct vm_area_struct *vma); 127 #endif 128 void *drm_gem_cma_prime_vmap(struct drm_gem_object *obj); 129 void drm_gem_cma_prime_vunmap(struct drm_gem_object *obj, void *vaddr); 130 131 struct drm_gem_object * 132 drm_cma_gem_create_object_default_funcs(struct drm_device *dev, size_t size); 133 134 /** 135 * DRM_GEM_CMA_VMAP_DRIVER_OPS - CMA GEM driver operations ensuring a virtual 136 * address on the buffer 137 * 138 * This macro provides a shortcut for setting the default GEM operations in the 139 * &drm_driver structure for drivers that need the virtual address also on 140 * imported buffers. 141 */ 142 #define DRM_GEM_CMA_VMAP_DRIVER_OPS \ 143 .gem_create_object = drm_cma_gem_create_object_default_funcs, \ 144 .dumb_create = drm_gem_cma_dumb_create, \ 145 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, \ 146 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, \ 147 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table_vmap, \ 148 .gem_prime_mmap = drm_gem_prime_mmap 149 150 struct drm_gem_object * 151 drm_gem_cma_prime_import_sg_table_vmap(struct drm_device *drm, 152 struct dma_buf_attachment *attach, 153 struct sg_table *sgt); 154 155 #endif /* __DRM_GEM_CMA_HELPER_H__ */ 156
Indexes created Tue Oct 21 16:10:11 GMT 2025