1 // SPDX-License-Identifier: GPL-2.0 or MIT 2 /* Copyright 2019 Linaro, Ltd, Rob Herring <robh@kernel.org> */ 3 /* Copyright 2023 Collabora ltd. */ 4 5 #include <linux/dma-buf.h> 6 #include <linux/dma-mapping.h> 7 #include <linux/err.h> 8 #include <linux/slab.h> 9 10 #include <drm/panthor_drm.h> 11 12 #include "panthor_device.h" 13 #include "panthor_gem.h" 14 #include "panthor_mmu.h" 15 16 static void panthor_gem_free_object(struct drm_gem_object *obj) 17 { 18 struct panthor_gem_object *bo = to_panthor_bo(obj); 19 struct drm_gem_object *vm_root_gem = bo->exclusive_vm_root_gem; 20 21 drm_gem_free_mmap_offset(&bo->base.base); 22 mutex_destroy(&bo->gpuva_list_lock); 23 drm_gem_shmem_free(&bo->base); 24 drm_gem_object_put(vm_root_gem); 25 } 26 27 /** 28 * panthor_kernel_bo_destroy() - Destroy a kernel buffer object 29 * @bo: Kernel buffer object to destroy. If NULL or an ERR_PTR(), the destruction 30 * is skipped. 31 */ 32 void panthor_kernel_bo_destroy(struct panthor_kernel_bo *bo) 33 { 34 struct panthor_vm *vm; 35 int ret; 36 37 if (IS_ERR_OR_NULL(bo)) 38 return; 39 40 vm = bo->vm; 41 panthor_kernel_bo_vunmap(bo); 42 43 if (drm_WARN_ON(bo->obj->dev, 44 to_panthor_bo(bo->obj)->exclusive_vm_root_gem != panthor_vm_root_gem(vm))) 45 goto out_free_bo; 46 47 ret = panthor_vm_unmap_range(vm, bo->va_node.start, bo->va_node.size); 48 if (ret) 49 goto out_free_bo; 50 51 panthor_vm_free_va(vm, &bo->va_node); 52 drm_gem_object_put(bo->obj); 53 54 out_free_bo: 55 panthor_vm_put(vm); 56 kfree(bo); 57 } 58 59 /** 60 * panthor_kernel_bo_create() - Create and map a GEM object to a VM 61 * @ptdev: Device. 62 * @vm: VM to map the GEM to. If NULL, the kernel object is not GPU mapped. 63 * @size: Size of the buffer object. 64 * @bo_flags: Combination of drm_panthor_bo_flags flags. 65 * @vm_map_flags: Combination of drm_panthor_vm_bind_op_flags (only those 66 * that are related to map operations). 67 * @gpu_va: GPU address assigned when mapping to the VM. 68 * If gpu_va == PANTHOR_VM_KERNEL_AUTO_VA, the virtual address will be 69 * automatically allocated. 70 * 71 * Return: A valid pointer in case of success, an ERR_PTR() otherwise. 72 */ 73 struct panthor_kernel_bo * 74 panthor_kernel_bo_create(struct panthor_device *ptdev, struct panthor_vm *vm, 75 size_t size, u32 bo_flags, u32 vm_map_flags, 76 u64 gpu_va) 77 { 78 struct drm_gem_shmem_object *obj; 79 struct panthor_kernel_bo *kbo; 80 struct panthor_gem_object *bo; 81 int ret; 82 83 if (drm_WARN_ON(&ptdev->base, !vm)) 84 return ERR_PTR(-EINVAL); 85 86 kbo = kzalloc(sizeof(*kbo), GFP_KERNEL); 87 if (!kbo) 88 return ERR_PTR(-ENOMEM); 89 90 obj = drm_gem_shmem_create(&ptdev->base, size); 91 if (IS_ERR(obj)) { 92 ret = PTR_ERR(obj); 93 goto err_free_bo; 94 } 95 96 bo = to_panthor_bo(&obj->base); 97 kbo->obj = &obj->base; 98 bo->flags = bo_flags; 99 100 /* The system and GPU MMU page size might differ, which becomes a 101 * problem for FW sections that need to be mapped at explicit address 102 * since our PAGE_SIZE alignment might cover a VA range that's 103 * expected to be used for another section. 104 * Make sure we never map more than we need. 105 */ 106 size = ALIGN(size, panthor_vm_page_size(vm)); 107 ret = panthor_vm_alloc_va(vm, gpu_va, size, &kbo->va_node); 108 if (ret) 109 goto err_put_obj; 110 111 ret = panthor_vm_map_bo_range(vm, bo, 0, size, kbo->va_node.start, vm_map_flags); 112 if (ret) 113 goto err_free_va; 114 115 kbo->vm = panthor_vm_get(vm); 116 bo->exclusive_vm_root_gem = panthor_vm_root_gem(vm); 117 drm_gem_object_get(bo->exclusive_vm_root_gem); 118 bo->base.base.resv = bo->exclusive_vm_root_gem->resv; 119 return kbo; 120 121 err_free_va: 122 panthor_vm_free_va(vm, &kbo->va_node); 123 124 err_put_obj: 125 drm_gem_object_put(&obj->base); 126 127 err_free_bo: 128 kfree(kbo); 129 return ERR_PTR(ret); 130 } 131 132 static int panthor_gem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma) 133 { 134 struct panthor_gem_object *bo = to_panthor_bo(obj); 135 136 /* Don't allow mmap on objects that have the NO_MMAP flag set. */ 137 if (bo->flags & DRM_PANTHOR_BO_NO_MMAP) 138 return -EINVAL; 139 140 return drm_gem_shmem_object_mmap(obj, vma); 141 } 142 143 static struct dma_buf * 144 panthor_gem_prime_export(struct drm_gem_object *obj, int flags) 145 { 146 /* We can't export GEMs that have an exclusive VM. */ 147 if (to_panthor_bo(obj)->exclusive_vm_root_gem) 148 return ERR_PTR(-EINVAL); 149 150 return drm_gem_prime_export(obj, flags); 151 } 152 153 static enum drm_gem_object_status panthor_gem_status(struct drm_gem_object *obj) 154 { 155 struct panthor_gem_object *bo = to_panthor_bo(obj); 156 enum drm_gem_object_status res = 0; 157 158 if (bo->base.base.import_attach || bo->base.pages) 159 res |= DRM_GEM_OBJECT_RESIDENT; 160 161 return res; 162 } 163 164 static const struct drm_gem_object_funcs panthor_gem_funcs = { 165 .free = panthor_gem_free_object, 166 .print_info = drm_gem_shmem_object_print_info, 167 .pin = drm_gem_shmem_object_pin, 168 .unpin = drm_gem_shmem_object_unpin, 169 .get_sg_table = drm_gem_shmem_object_get_sg_table, 170 .vmap = drm_gem_shmem_object_vmap, 171 .vunmap = drm_gem_shmem_object_vunmap, 172 .mmap = panthor_gem_mmap, 173 .status = panthor_gem_status, 174 .export = panthor_gem_prime_export, 175 .vm_ops = &drm_gem_shmem_vm_ops, 176 }; 177 178 /** 179 * panthor_gem_create_object - Implementation of driver->gem_create_object. 180 * @ddev: DRM device 181 * @size: Size in bytes of the memory the object will reference 182 * 183 * This lets the GEM helpers allocate object structs for us, and keep 184 * our BO stats correct. 185 */ 186 struct drm_gem_object *panthor_gem_create_object(struct drm_device *ddev, size_t size) 187 { 188 struct panthor_device *ptdev = container_of(ddev, struct panthor_device, base); 189 struct panthor_gem_object *obj; 190 191 obj = kzalloc(sizeof(*obj), GFP_KERNEL); 192 if (!obj) 193 return ERR_PTR(-ENOMEM); 194 195 obj->base.base.funcs = &panthor_gem_funcs; 196 obj->base.map_wc = !ptdev->coherent; 197 mutex_init(&obj->gpuva_list_lock); 198 drm_gem_gpuva_set_lock(&obj->base.base, &obj->gpuva_list_lock); 199 200 return &obj->base.base; 201 } 202 203 /** 204 * panthor_gem_create_with_handle() - Create a GEM object and attach it to a handle. 205 * @file: DRM file. 206 * @ddev: DRM device. 207 * @exclusive_vm: Exclusive VM. Not NULL if the GEM object can't be shared. 208 * @size: Size of the GEM object to allocate. 209 * @flags: Combination of drm_panthor_bo_flags flags. 210 * @handle: Pointer holding the handle pointing to the new GEM object. 211 * 212 * Return: Zero on success 213 */ 214 int 215 panthor_gem_create_with_handle(struct drm_file *file, 216 struct drm_device *ddev, 217 struct panthor_vm *exclusive_vm, 218 u64 *size, u32 flags, u32 *handle) 219 { 220 int ret; 221 struct drm_gem_shmem_object *shmem; 222 struct panthor_gem_object *bo; 223 224 shmem = drm_gem_shmem_create(ddev, *size); 225 if (IS_ERR(shmem)) 226 return PTR_ERR(shmem); 227 228 bo = to_panthor_bo(&shmem->base); 229 bo->flags = flags; 230 231 if (exclusive_vm) { 232 bo->exclusive_vm_root_gem = panthor_vm_root_gem(exclusive_vm); 233 drm_gem_object_get(bo->exclusive_vm_root_gem); 234 bo->base.base.resv = bo->exclusive_vm_root_gem->resv; 235 } 236 237 /* 238 * Allocate an id of idr table where the obj is registered 239 * and handle has the id what user can see. 240 */ 241 ret = drm_gem_handle_create(file, &shmem->base, handle); 242 if (!ret) 243 *size = bo->base.base.size; 244 245 /* drop reference from allocate - handle holds it now. */ 246 drm_gem_object_put(&shmem->base); 247 248 return ret; 249 } 250