1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright © 2019 Intel Corporation 4 */ 5 6 #include <uapi/drm/i915_drm.h> 7 8 #include "intel_memory_region.h" 9 #include "i915_gem_region.h" 10 #include "i915_drv.h" 11 #include "i915_trace.h" 12 13 void i915_gem_object_init_memory_region(struct drm_i915_gem_object *obj, 14 struct intel_memory_region *mem) 15 { 16 obj->mm.region = mem; 17 18 mutex_lock(&mem->objects.lock); 19 list_add(&obj->mm.region_link, &mem->objects.list); 20 mutex_unlock(&mem->objects.lock); 21 } 22 23 void i915_gem_object_release_memory_region(struct drm_i915_gem_object *obj) 24 { 25 struct intel_memory_region *mem = obj->mm.region; 26 27 mutex_lock(&mem->objects.lock); 28 list_del(&obj->mm.region_link); 29 mutex_unlock(&mem->objects.lock); 30 } 31 32 static struct drm_i915_gem_object * 33 __i915_gem_object_create_region(struct intel_memory_region *mem, 34 resource_size_t offset, 35 resource_size_t size, 36 resource_size_t page_size, 37 unsigned int flags) 38 { 39 struct drm_i915_gem_object *obj; 40 resource_size_t default_page_size; 41 int err; 42 43 /* 44 * NB: Our use of resource_size_t for the size stems from using struct 45 * resource for the mem->region. We might need to revisit this in the 46 * future. 47 */ 48 49 GEM_BUG_ON(flags & ~I915_BO_ALLOC_FLAGS); 50 51 if (WARN_ON_ONCE(flags & I915_BO_ALLOC_GPU_ONLY && 52 (flags & I915_BO_ALLOC_CPU_CLEAR || 53 flags & I915_BO_ALLOC_PM_EARLY))) 54 return ERR_PTR(-EINVAL); 55 56 if (!mem) 57 return ERR_PTR(-ENODEV); 58 59 default_page_size = mem->min_page_size; 60 if (page_size) 61 default_page_size = page_size; 62 63 GEM_BUG_ON(!is_power_of_2_u64(default_page_size)); 64 GEM_BUG_ON(default_page_size < PAGE_SIZE); 65 66 size = round_up(size, default_page_size); 67 68 if (default_page_size == size) 69 flags |= I915_BO_ALLOC_CONTIGUOUS; 70 71 GEM_BUG_ON(!size); 72 GEM_BUG_ON(!IS_ALIGNED(size, I915_GTT_MIN_ALIGNMENT)); 73 74 if (i915_gem_object_size_2big(size)) 75 return ERR_PTR(-E2BIG); 76 77 obj = i915_gem_object_alloc(); 78 if (!obj) 79 return ERR_PTR(-ENOMEM); 80 81 /* 82 * Anything smaller than the min_page_size can't be freely inserted into 83 * the GTT, due to alignemnt restrictions. For such special objects, 84 * make sure we force memcpy based suspend-resume. In the future we can 85 * revisit this, either by allowing special mis-aligned objects in the 86 * migration path, or by mapping all of LMEM upfront using cheap 1G 87 * GTT entries. 88 */ 89 if (default_page_size < mem->min_page_size) 90 flags |= I915_BO_ALLOC_PM_EARLY; 91 92 err = mem->ops->init_object(mem, obj, offset, size, page_size, flags); 93 if (err) 94 goto err_object_free; 95 96 trace_i915_gem_object_create(obj); 97 return obj; 98 99 err_object_free: 100 i915_gem_object_free(obj); 101 return ERR_PTR(err); 102 } 103 104 struct drm_i915_gem_object * 105 i915_gem_object_create_region(struct intel_memory_region *mem, 106 resource_size_t size, 107 resource_size_t page_size, 108 unsigned int flags) 109 { 110 return __i915_gem_object_create_region(mem, I915_BO_INVALID_OFFSET, 111 size, page_size, flags); 112 } 113 114 struct drm_i915_gem_object * 115 i915_gem_object_create_region_at(struct intel_memory_region *mem, 116 resource_size_t offset, 117 resource_size_t size, 118 unsigned int flags) 119 { 120 GEM_BUG_ON(offset == I915_BO_INVALID_OFFSET); 121 122 if (GEM_WARN_ON(!IS_ALIGNED(size, mem->min_page_size)) || 123 GEM_WARN_ON(!IS_ALIGNED(offset, mem->min_page_size))) 124 return ERR_PTR(-EINVAL); 125 126 if (range_overflows(offset, size, resource_size(&mem->region))) 127 return ERR_PTR(-EINVAL); 128 129 if (!(flags & I915_BO_ALLOC_GPU_ONLY) && 130 offset + size > mem->io_size && 131 !i915_ggtt_has_aperture(to_gt(mem->i915)->ggtt)) 132 return ERR_PTR(-ENOSPC); 133 134 return __i915_gem_object_create_region(mem, offset, size, 0, 135 flags | I915_BO_ALLOC_CONTIGUOUS); 136 } 137 138 /** 139 * i915_gem_process_region - Iterate over all objects of a region using ops 140 * to process and optionally skip objects 141 * @mr: The memory region 142 * @apply: ops and private data 143 * 144 * This function can be used to iterate over the regions object list, 145 * checking whether to skip objects, and, if not, lock the objects and 146 * process them using the supplied ops. Note that this function temporarily 147 * removes objects from the region list while iterating, so that if run 148 * concurrently with itself may not iterate over all objects. 149 * 150 * Return: 0 if successful, negative error code on failure. 151 */ 152 int i915_gem_process_region(struct intel_memory_region *mr, 153 struct i915_gem_apply_to_region *apply) 154 { 155 const struct i915_gem_apply_to_region_ops *ops = apply->ops; 156 struct drm_i915_gem_object *obj; 157 struct list_head still_in_list; 158 int ret = 0; 159 160 /* 161 * In the future, a non-NULL apply->ww could mean the caller is 162 * already in a locking transaction and provides its own context. 163 */ 164 GEM_WARN_ON(apply->ww); 165 166 INIT_LIST_HEAD(&still_in_list); 167 mutex_lock(&mr->objects.lock); 168 for (;;) { 169 struct i915_gem_ww_ctx ww; 170 171 obj = list_first_entry_or_null(&mr->objects.list, typeof(*obj), 172 mm.region_link); 173 if (!obj) 174 break; 175 176 list_move_tail(&obj->mm.region_link, &still_in_list); 177 if (!kref_get_unless_zero(&obj->base.refcount)) 178 continue; 179 180 /* 181 * Note: Someone else might be migrating the object at this 182 * point. The object's region is not stable until we lock 183 * the object. 184 */ 185 mutex_unlock(&mr->objects.lock); 186 apply->ww = &ww; 187 for_i915_gem_ww(&ww, ret, apply->interruptible) { 188 ret = i915_gem_object_lock(obj, apply->ww); 189 if (ret) 190 continue; 191 192 if (obj->mm.region == mr) 193 ret = ops->process_obj(apply, obj); 194 /* Implicit object unlock */ 195 } 196 197 i915_gem_object_put(obj); 198 mutex_lock(&mr->objects.lock); 199 if (ret) 200 break; 201 } 202 list_splice_tail(&still_in_list, &mr->objects.list); 203 mutex_unlock(&mr->objects.lock); 204 205 return ret; 206 } 207