1 /* SPDX-License-Identifier: MIT */
3 * Copyright © 2021 Intel Corporation
6 #ifndef __I915_VMA_RESOURCE_H__
7 #define __I915_VMA_RESOURCE_H__
9 #include <linux/dma-fence.h>
10 #include <linux/refcount.h>
13 #include "i915_scatterlist.h"
14 #include "i915_sw_fence.h"
15 #include "intel_runtime_pm.h"
17 struct intel_memory_region;
19 struct i915_page_sizes {
21 * The sg mask of the pages sg_table. i.e the mask of
22 * the lengths for each sg entry.
27 * The gtt page sizes we are allowed to use given the
28 * sg mask and the supported page sizes. This will
29 * express the smallest unit we can use for the whole
30 * object, as well as the larger sizes we may be able
31 * to use opportunistically.
37 * struct i915_vma_bindinfo - Information needed for async bind
38 * only but that can be dropped after the bind has taken place.
39 * Consider making this a separate argument to the bind_vma
40 * op, coalescing with other arguments like vm, stash, cache_level
42 * @pages: The pages sg-table.
43 * @page_sizes: Page sizes of the pages.
44 * @pages_rsgt: Refcounted sg-table when delayed object destruction
45 * is supported. May be NULL.
46 * @readonly: Whether the vma should be bound read-only.
47 * @lmem: Whether the vma points to lmem.
49 struct i915_vma_bindinfo {
50 struct sg_table *pages;
51 struct i915_page_sizes page_sizes;
52 struct i915_refct_sgt *pages_rsgt;
58 * struct i915_vma_resource - Snapshotted unbind information.
59 * @unbind_fence: Fence to mark unbinding complete. Note that this fence
60 * is not considered published until unbind is scheduled, and as such it
61 * is illegal to access this fence before scheduled unbind other than
63 * @lock: The @unbind_fence lock.
64 * @hold_count: Number of holders blocking the fence from finishing.
65 * The vma itself is keeping a hold, which is released when unbind
67 * @work: Work struct for deferred unbind work.
68 * @chain: Pointer to struct i915_sw_fence used to await dependencies.
69 * @rb: Rb node for the vm's pending unbind interval tree.
70 * @__subtree_last: Interval tree private member.
72 * @vm: non-refcounted pointer to the vm. This is for internal use only and
73 * this member is cleared after vm_resource unbind.
74 * @mr: The memory region of the object pointed to by the vma.
75 * @ops: Pointer to the backend i915_vma_ops.
76 * @private: Bind backend private info.
77 * @start: Offset into the address space of bind range start. Note that
78 * this is after any padding that might have been allocated.
79 * @node_size: Size of the allocated range manager node with padding
81 * @vma_size: Bind size.
82 * @guard: The size of guard area preceding and trailing the bind.
83 * @page_sizes_gtt: Resulting page sizes from the bind operation.
84 * @bound_flags: Flags indicating binding status.
85 * @allocated: Backend private data. TODO: Should move into @private.
86 * @immediate_unbind: Unbind can be done immediately and doesn't need to be
87 * deferred to a work item awaiting unsignaled fences. This is a hack.
88 * (dma_fence_work uses a fence flag for this, but this seems slightly
90 * @needs_wakeref: Whether a wakeref is needed during unbind. Since we can't
91 * take a wakeref in the dma-fence signalling critical path, it needs to be
92 * taken when the unbind is scheduled.
93 * @skip_pte_rewrite: During ggtt suspend and vm takedown pte rewriting
94 * needs to be skipped for unbind.
95 * @tlb: pointer for obj->mm.tlb, if async unbind. Otherwise, NULL
97 * The lifetime of a struct i915_vma_resource is from a binding request to
98 * the actual possible asynchronous unbind has completed.
100 struct i915_vma_resource {
101 struct dma_fence unbind_fence;
102 /* See above for description of the lock. */
104 refcount_t hold_count;
105 struct work_struct work;
106 struct i915_sw_fence chain;
109 struct i915_address_space *vm;
110 intel_wakeref_t wakeref;
113 * @bi: Information needed for async bind only but that can be dropped
114 * after the bind has taken place.
116 * Consider making this a separate argument to the bind_vma op,
117 * coalescing with other arguments like vm, stash, cache_level and flags
119 struct i915_vma_bindinfo bi;
121 #if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)
122 struct intel_memory_region *mr;
124 const struct i915_vma_ops *ops;
134 bool immediate_unbind:1;
135 bool needs_wakeref:1;
136 bool skip_pte_rewrite:1;
141 bool i915_vma_resource_hold(struct i915_vma_resource *vma_res,
142 bool *lockdep_cookie);
144 void i915_vma_resource_unhold(struct i915_vma_resource *vma_res,
145 bool lockdep_cookie);
147 struct i915_vma_resource *i915_vma_resource_alloc(void);
149 void i915_vma_resource_free(struct i915_vma_resource *vma_res);
151 struct dma_fence *i915_vma_resource_unbind(struct i915_vma_resource *vma_res,
154 void __i915_vma_resource_init(struct i915_vma_resource *vma_res);
157 * i915_vma_resource_get - Take a reference on a vma resource
158 * @vma_res: The vma resource on which to take a reference.
160 * Return: The @vma_res pointer
162 static inline struct i915_vma_resource
163 *i915_vma_resource_get(struct i915_vma_resource *vma_res)
165 dma_fence_get(&vma_res->unbind_fence);
170 * i915_vma_resource_put - Release a reference to a struct i915_vma_resource
171 * @vma_res: The resource
173 static inline void i915_vma_resource_put(struct i915_vma_resource *vma_res)
175 dma_fence_put(&vma_res->unbind_fence);
179 * i915_vma_resource_init - Initialize a vma resource.
180 * @vma_res: The vma resource to initialize
181 * @vm: Pointer to the vm.
182 * @pages: The pages sg-table.
183 * @page_sizes: Page sizes of the pages.
184 * @pages_rsgt: Pointer to a struct i915_refct_sgt of an object with
185 * delayed destruction.
186 * @readonly: Whether the vma should be bound read-only.
187 * @lmem: Whether the vma points to lmem.
188 * @mr: The memory region of the object the vma points to.
189 * @ops: The backend ops.
190 * @private: Bind backend private info.
191 * @start: Offset into the address space of bind range start after padding.
192 * @node_size: Size of the allocated range manager node minus padding.
194 * @guard: The size of the guard area preceding and trailing the bind.
196 * Initializes a vma resource allocated using i915_vma_resource_alloc().
197 * The reason for having separate allocate and initialize function is that
198 * initialization may need to be performed from under a lock where
199 * allocation is not allowed.
201 static inline void i915_vma_resource_init(struct i915_vma_resource *vma_res,
202 struct i915_address_space *vm,
203 struct sg_table *pages,
204 const struct i915_page_sizes *page_sizes,
205 struct i915_refct_sgt *pages_rsgt,
208 struct intel_memory_region *mr,
209 const struct i915_vma_ops *ops,
216 __i915_vma_resource_init(vma_res);
218 vma_res->bi.pages = pages;
219 vma_res->bi.page_sizes = *page_sizes;
221 vma_res->bi.pages_rsgt = i915_refct_sgt_get(pages_rsgt);
222 vma_res->bi.readonly = readonly;
223 vma_res->bi.lmem = lmem;
224 #if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)
228 vma_res->private = private;
229 vma_res->start = start;
230 vma_res->node_size = node_size;
231 vma_res->vma_size = size;
232 vma_res->guard = guard;
235 static inline void i915_vma_resource_fini(struct i915_vma_resource *vma_res)
237 GEM_BUG_ON(refcount_read(&vma_res->hold_count) != 1);
238 if (vma_res->bi.pages_rsgt)
239 i915_refct_sgt_put(vma_res->bi.pages_rsgt);
240 i915_sw_fence_fini(&vma_res->chain);
243 int i915_vma_resource_bind_dep_sync(struct i915_address_space *vm,
248 int i915_vma_resource_bind_dep_await(struct i915_address_space *vm,
249 struct i915_sw_fence *sw_fence,
255 void i915_vma_resource_bind_dep_sync_all(struct i915_address_space *vm);
257 void i915_vma_resource_module_exit(void);
259 int i915_vma_resource_module_init(void);