1 // SPDX-License-Identifier: MIT 2 /* 3 * Copyright © 2019 Intel Corporation 4 */ 5 6 #include "intel_memory_region.h" 7 #include "i915_gem_region.h" 8 #include "i915_drv.h" 9 #include "i915_trace.h" 10 11 void i915_gem_object_init_memory_region(struct drm_i915_gem_object *obj, 12 struct intel_memory_region *mem) 13 { 14 obj->mm.region = mem; 15 16 mutex_lock(&mem->objects.lock); 17 list_add(&obj->mm.region_link, &mem->objects.list); 18 mutex_unlock(&mem->objects.lock); 19 } 20 21 void i915_gem_object_release_memory_region(struct drm_i915_gem_object *obj) 22 { 23 struct intel_memory_region *mem = obj->mm.region; 24 25 mutex_lock(&mem->objects.lock); 26 list_del(&obj->mm.region_link); 27 mutex_unlock(&mem->objects.lock); 28 } 29 30 struct drm_i915_gem_object * 31 i915_gem_object_create_region(struct intel_memory_region *mem, 32 resource_size_t size, 33 resource_size_t page_size, 34 unsigned int flags) 35 { 36 struct drm_i915_gem_object *obj; 37 resource_size_t default_page_size; 38 int err; 39 40 /* 41 * NB: Our use of resource_size_t for the size stems from using struct 42 * resource for the mem->region. We might need to revisit this in the 43 * future. 44 */ 45 46 GEM_BUG_ON(flags & ~I915_BO_ALLOC_FLAGS); 47 48 if (!mem) 49 return ERR_PTR(-ENODEV); 50 51 default_page_size = mem->min_page_size; 52 if (page_size) 53 default_page_size = page_size; 54 55 GEM_BUG_ON(!is_power_of_2_u64(default_page_size)); 56 GEM_BUG_ON(default_page_size < PAGE_SIZE); 57 58 size = round_up(size, default_page_size); 59 60 GEM_BUG_ON(!size); 61 GEM_BUG_ON(!IS_ALIGNED(size, I915_GTT_MIN_ALIGNMENT)); 62 63 if (i915_gem_object_size_2big(size)) 64 return ERR_PTR(-E2BIG); 65 66 obj = i915_gem_object_alloc(); 67 if (!obj) 68 return ERR_PTR(-ENOMEM); 69 70 err = mem->ops->init_object(mem, obj, size, page_size, flags); 71 if (err) 72 goto err_object_free; 73 74 trace_i915_gem_object_create(obj); 75 return obj; 76 77 err_object_free: 78 i915_gem_object_free(obj); 79 return ERR_PTR(err); 80 } 81 82 /** 83 * i915_gem_process_region - Iterate over all objects of a region using ops 84 * to process and optionally skip objects 85 * @mr: The memory region 86 * @apply: ops and private data 87 * 88 * This function can be used to iterate over the regions object list, 89 * checking whether to skip objects, and, if not, lock the objects and 90 * process them using the supplied ops. Note that this function temporarily 91 * removes objects from the region list while iterating, so that if run 92 * concurrently with itself may not iterate over all objects. 93 * 94 * Return: 0 if successful, negative error code on failure. 95 */ 96 int i915_gem_process_region(struct intel_memory_region *mr, 97 struct i915_gem_apply_to_region *apply) 98 { 99 const struct i915_gem_apply_to_region_ops *ops = apply->ops; 100 struct drm_i915_gem_object *obj; 101 struct list_head still_in_list; 102 int ret = 0; 103 104 /* 105 * In the future, a non-NULL apply->ww could mean the caller is 106 * already in a locking transaction and provides its own context. 107 */ 108 GEM_WARN_ON(apply->ww); 109 110 INIT_LIST_HEAD(&still_in_list); 111 mutex_lock(&mr->objects.lock); 112 for (;;) { 113 struct i915_gem_ww_ctx ww; 114 115 obj = list_first_entry_or_null(&mr->objects.list, typeof(*obj), 116 mm.region_link); 117 if (!obj) 118 break; 119 120 list_move_tail(&obj->mm.region_link, &still_in_list); 121 if (!kref_get_unless_zero(&obj->base.refcount)) 122 continue; 123 124 /* 125 * Note: Someone else might be migrating the object at this 126 * point. The object's region is not stable until we lock 127 * the object. 128 */ 129 mutex_unlock(&mr->objects.lock); 130 apply->ww = &ww; 131 for_i915_gem_ww(&ww, ret, apply->interruptible) { 132 ret = i915_gem_object_lock(obj, apply->ww); 133 if (ret) 134 continue; 135 136 if (obj->mm.region == mr) 137 ret = ops->process_obj(apply, obj); 138 /* Implicit object unlock */ 139 } 140 141 i915_gem_object_put(obj); 142 mutex_lock(&mr->objects.lock); 143 if (ret) 144 break; 145 } 146 list_splice_tail(&still_in_list, &mr->objects.list); 147 mutex_unlock(&mr->objects.lock); 148 149 return ret; 150 } 151