drm_gem_cma_helper.h revision 1.2
1 /* $NetBSD: drm_gem_cma_helper.h,v 1.2 2021/12/19 10:29:16 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 #include <sys/vmem.h> 12 13 struct drm_mode_create_dumb; 14 15 /** 16 * struct drm_gem_cma_object - GEM object backed by CMA memory allocations 17 * @base: base GEM object 18 * @paddr: physical address of the backing memory 19 * @sgt: scatter/gather table for imported PRIME buffers. The table can have 20 * more than one entry but they are guaranteed to have contiguous 21 * DMA addresses. 22 * @vaddr: kernel virtual address of the backing memory 23 */ 24 struct drm_gem_cma_object { 25 struct drm_gem_object base; 26 #ifdef __NetBSD__ 27 bus_dma_tag_t dmat; 28 bus_dma_segment_t dmasegs[1]; 29 bus_size_t dmasize; 30 bus_dmamap_t dmamap; 31 vmem_t *vmem_pool; 32 vmem_addr_t vmem_addr; 33 #else 34 dma_addr_t paddr; 35 #endif 36 struct sg_table *sgt; 37 38 /* For objects with DMA memory allocated by GEM CMA */ 39 void *vaddr; 40 }; 41 42 #define to_drm_gem_cma_obj(gem_obj) \ 43 container_of(gem_obj, struct drm_gem_cma_object, base) 44 45 #ifndef CONFIG_MMU 46 #define DRM_GEM_CMA_UNMAPPED_AREA_FOPS \ 47 .get_unmapped_area = drm_gem_cma_get_unmapped_area, 48 #else 49 #define DRM_GEM_CMA_UNMAPPED_AREA_FOPS 50 #endif 51 52 /** 53 * DEFINE_DRM_GEM_CMA_FOPS() - macro to generate file operations for CMA drivers 54 * @name: name for the generated structure 55 * 56 * This macro autogenerates a suitable &struct file_operations for CMA based 57 * drivers, which can be assigned to &drm_driver.fops. Note that this structure 58 * cannot be shared between drivers, because it contains a reference to the 59 * current module using THIS_MODULE. 60 * 61 * Note that the declaration is already marked as static - if you need a 62 * non-static version of this you're probably doing it wrong and will break the 63 * THIS_MODULE reference by accident. 64 */ 65 #define DEFINE_DRM_GEM_CMA_FOPS(name) \ 66 static const struct file_operations name = {\ 67 .owner = THIS_MODULE,\ 68 .open = drm_open,\ 69 .release = drm_release,\ 70 .unlocked_ioctl = drm_ioctl,\ 71 .compat_ioctl = drm_compat_ioctl,\ 72 .poll = drm_poll,\ 73 .read = drm_read,\ 74 .llseek = noop_llseek,\ 75 .mmap = drm_gem_cma_mmap,\ 76 DRM_GEM_CMA_UNMAPPED_AREA_FOPS \ 77 } 78 79 /* free GEM object */ 80 void drm_gem_cma_free_object(struct drm_gem_object *gem_obj); 81 82 /* create memory region for DRM framebuffer */ 83 int drm_gem_cma_dumb_create_internal(struct drm_file *file_priv, 84 struct drm_device *drm, 85 struct drm_mode_create_dumb *args); 86 87 /* create memory region for DRM framebuffer */ 88 int drm_gem_cma_dumb_create(struct drm_file *file_priv, 89 struct drm_device *drm, 90 struct drm_mode_create_dumb *args); 91 92 /* set vm_flags and we can change the VM attribute to other one at here */ 93 #ifndef __NetBSD__ 94 int drm_gem_cma_mmap(struct file *filp, struct vm_area_struct *vma); 95 #endif 96 97 /* allocate physical memory */ 98 struct drm_gem_cma_object *drm_gem_cma_create(struct drm_device *drm, 99 size_t size); 100 101 #ifdef __NetBSD__ 102 extern const struct uvm_pagerops drm_gem_cma_uvm_ops; 103 #else 104 extern const struct vm_operations_struct drm_gem_cma_vm_ops; 105 #endif 106 107 #ifndef CONFIG_MMU 108 unsigned long drm_gem_cma_get_unmapped_area(struct file *filp, 109 unsigned long addr, 110 unsigned long len, 111 unsigned long pgoff, 112 unsigned long flags); 113 #endif 114 115 void drm_gem_cma_print_info(struct drm_printer *p, unsigned int indent, 116 const struct drm_gem_object *obj); 117 118 struct sg_table *drm_gem_cma_prime_get_sg_table(struct drm_gem_object *obj); 119 struct drm_gem_object * 120 drm_gem_cma_prime_import_sg_table(struct drm_device *dev, 121 struct dma_buf_attachment *attach, 122 struct sg_table *sgt); 123 #ifdef __NetBSD__ 124 int drm_gem_cma_prime_mmap(struct drm_gem_object *, off_t *, size_t, int, 125 int *, int *, struct uvm_object **, int *); 126 #else 127 int drm_gem_cma_prime_mmap(struct drm_gem_object *obj, 128 struct vm_area_struct *vma); 129 #endif 130 void *drm_gem_cma_prime_vmap(struct drm_gem_object *obj); 131 void drm_gem_cma_prime_vunmap(struct drm_gem_object *obj, void *vaddr); 132 133 struct drm_gem_object * 134 drm_cma_gem_create_object_default_funcs(struct drm_device *dev, size_t size); 135 136 /** 137 * DRM_GEM_CMA_VMAP_DRIVER_OPS - CMA GEM driver operations ensuring a virtual 138 * address on the buffer 139 * 140 * This macro provides a shortcut for setting the default GEM operations in the 141 * &drm_driver structure for drivers that need the virtual address also on 142 * imported buffers. 143 */ 144 #define DRM_GEM_CMA_VMAP_DRIVER_OPS \ 145 .gem_create_object = drm_cma_gem_create_object_default_funcs, \ 146 .dumb_create = drm_gem_cma_dumb_create, \ 147 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, \ 148 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, \ 149 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table_vmap, \ 150 .gem_prime_mmap = drm_gem_prime_mmap 151 152 struct drm_gem_object * 153 drm_gem_cma_prime_import_sg_table_vmap(struct drm_device *drm, 154 struct dma_buf_attachment *attach, 155 struct sg_table *sgt); 156 157 #endif /* __DRM_GEM_CMA_HELPER_H__ */ 158
Indexes created Sun Oct 19 02:09:48 GMT 2025