summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/i915/i915_vma_resource.h
blob: 06923d1816e7e70ffcb5d6c8d9b1770abbfa3304 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
/* SPDX-License-Identifier: MIT */
/*
 * Copyright © 2021 Intel Corporation
 */

#ifndef __I915_VMA_RESOURCE_H__
#define __I915_VMA_RESOURCE_H__

#include <linux/dma-fence.h>
#include <linux/refcount.h>

#include "i915_gem.h"
#include "i915_scatterlist.h"
#include "i915_sw_fence.h"
#include "intel_runtime_pm.h"

struct intel_memory_region;

struct i915_page_sizes {
	/**
	 * The sg mask of the pages sg_table. i.e the mask of
	 * the lengths for each sg entry.
	 */
	unsigned int phys;

	/**
	 * The gtt page sizes we are allowed to use given the
	 * sg mask and the supported page sizes. This will
	 * express the smallest unit we can use for the whole
	 * object, as well as the larger sizes we may be able
	 * to use opportunistically.
	 */
	unsigned int sg;
};

/**
 * struct i915_vma_resource - Snapshotted unbind information.
 * @unbind_fence: Fence to mark unbinding complete. Note that this fence
 * is not considered published until unbind is scheduled, and as such it
 * is illegal to access this fence before scheduled unbind other than
 * for refcounting.
 * @lock: The @unbind_fence lock.
 * @hold_count: Number of holders blocking the fence from finishing.
 * The vma itself is keeping a hold, which is released when unbind
 * is scheduled.
 * @work: Work struct for deferred unbind work.
 * @chain: Pointer to struct i915_sw_fence used to await dependencies.
 * @rb: Rb node for the vm's pending unbind interval tree.
 * @__subtree_last: Interval tree private member.
 * @vm: non-refcounted pointer to the vm. This is for internal use only and
 * this member is cleared after vm_resource unbind.
 * @mr: The memory region of the object pointed to by the vma.
 * @ops: Pointer to the backend i915_vma_ops.
 * @private: Bind backend private info.
 * @start: Offset into the address space of bind range start.
 * @node_size: Size of the allocated range manager node.
 * @vma_size: Bind size.
 * @page_sizes_gtt: Resulting page sizes from the bind operation.
 * @bound_flags: Flags indicating binding status.
 * @allocated: Backend private data. TODO: Should move into @private.
 * @immediate_unbind: Unbind can be done immediately and doesn't need to be
 * deferred to a work item awaiting unsignaled fences. This is a hack.
 * (dma_fence_work uses a fence flag for this, but this seems slightly
 * cleaner).
 * @needs_wakeref: Whether a wakeref is needed during unbind. Since we can't
 * take a wakeref in the dma-fence signalling critical path, it needs to be
 * taken when the unbind is scheduled.
 * @skip_pte_rewrite: During ggtt suspend and vm takedown pte rewriting
 * needs to be skipped for unbind.
 * @tlb: pointer for obj->mm.tlb, if async unbind. Otherwise, NULL
 *
 * The lifetime of a struct i915_vma_resource is from a binding request to
 * the actual possible asynchronous unbind has completed.
 */
struct i915_vma_resource {
	struct dma_fence unbind_fence;
	/* See above for description of the lock. */
	spinlock_t lock;
	refcount_t hold_count;
	struct work_struct work;
	struct i915_sw_fence chain;
	struct rb_node rb;
	u64 __subtree_last;
	struct i915_address_space *vm;
	intel_wakeref_t wakeref;

	/**
	 * struct i915_vma_bindinfo - Information needed for async bind
	 * only but that can be dropped after the bind has taken place.
	 * Consider making this a separate argument to the bind_vma
	 * op, coalescing with other arguments like vm, stash, cache_level
	 * and flags
	 * @pages: The pages sg-table.
	 * @page_sizes: Page sizes of the pages.
	 * @pages_rsgt: Refcounted sg-table when delayed object destruction
	 * is supported. May be NULL.
	 * @readonly: Whether the vma should be bound read-only.
	 * @lmem: Whether the vma points to lmem.
	 */
	struct i915_vma_bindinfo {
		struct sg_table *pages;
		struct i915_page_sizes page_sizes;
		struct i915_refct_sgt *pages_rsgt;
		bool readonly:1;
		bool lmem:1;
	} bi;

#if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)
	struct intel_memory_region *mr;
#endif
	const struct i915_vma_ops *ops;
	void *private;
	u64 start;
	u64 node_size;
	u64 vma_size;
	u32 page_sizes_gtt;

	u32 bound_flags;
	bool allocated:1;
	bool immediate_unbind:1;
	bool needs_wakeref:1;
	bool skip_pte_rewrite:1;

	u32 *tlb;
};

bool i915_vma_resource_hold(struct i915_vma_resource *vma_res,
			    bool *lockdep_cookie);

void i915_vma_resource_unhold(struct i915_vma_resource *vma_res,
			      bool lockdep_cookie);

struct i915_vma_resource *i915_vma_resource_alloc(void);

void i915_vma_resource_free(struct i915_vma_resource *vma_res);

struct dma_fence *i915_vma_resource_unbind(struct i915_vma_resource *vma_res,
					   u32 *tlb);

void __i915_vma_resource_init(struct i915_vma_resource *vma_res);

/**
 * i915_vma_resource_get - Take a reference on a vma resource
 * @vma_res: The vma resource on which to take a reference.
 *
 * Return: The @vma_res pointer
 */
static inline struct i915_vma_resource
*i915_vma_resource_get(struct i915_vma_resource *vma_res)
{
	dma_fence_get(&vma_res->unbind_fence);
	return vma_res;
}

/**
 * i915_vma_resource_put - Release a reference to a struct i915_vma_resource
 * @vma_res: The resource
 */
static inline void i915_vma_resource_put(struct i915_vma_resource *vma_res)
{
	dma_fence_put(&vma_res->unbind_fence);
}

/**
 * i915_vma_resource_init - Initialize a vma resource.
 * @vma_res: The vma resource to initialize
 * @vm: Pointer to the vm.
 * @pages: The pages sg-table.
 * @page_sizes: Page sizes of the pages.
 * @pages_rsgt: Pointer to a struct i915_refct_sgt of an object with
 * delayed destruction.
 * @readonly: Whether the vma should be bound read-only.
 * @lmem: Whether the vma points to lmem.
 * @mr: The memory region of the object the vma points to.
 * @ops: The backend ops.
 * @private: Bind backend private info.
 * @start: Offset into the address space of bind range start.
 * @node_size: Size of the allocated range manager node.
 * @size: Bind size.
 *
 * Initializes a vma resource allocated using i915_vma_resource_alloc().
 * The reason for having separate allocate and initialize function is that
 * initialization may need to be performed from under a lock where
 * allocation is not allowed.
 */
static inline void i915_vma_resource_init(struct i915_vma_resource *vma_res,
					  struct i915_address_space *vm,
					  struct sg_table *pages,
					  const struct i915_page_sizes *page_sizes,
					  struct i915_refct_sgt *pages_rsgt,
					  bool readonly,
					  bool lmem,
					  struct intel_memory_region *mr,
					  const struct i915_vma_ops *ops,
					  void *private,
					  u64 start,
					  u64 node_size,
					  u64 size)
{
	__i915_vma_resource_init(vma_res);
	vma_res->vm = vm;
	vma_res->bi.pages = pages;
	vma_res->bi.page_sizes = *page_sizes;
	if (pages_rsgt)
		vma_res->bi.pages_rsgt = i915_refct_sgt_get(pages_rsgt);
	vma_res->bi.readonly = readonly;
	vma_res->bi.lmem = lmem;
#if IS_ENABLED(CONFIG_DRM_I915_CAPTURE_ERROR)
	vma_res->mr = mr;
#endif
	vma_res->ops = ops;
	vma_res->private = private;
	vma_res->start = start;
	vma_res->node_size = node_size;
	vma_res->vma_size = size;
}

static inline void i915_vma_resource_fini(struct i915_vma_resource *vma_res)
{
	GEM_BUG_ON(refcount_read(&vma_res->hold_count) != 1);
	if (vma_res->bi.pages_rsgt)
		i915_refct_sgt_put(vma_res->bi.pages_rsgt);
	i915_sw_fence_fini(&vma_res->chain);
}

int i915_vma_resource_bind_dep_sync(struct i915_address_space *vm,
				    u64 first,
				    u64 last,
				    bool intr);

int i915_vma_resource_bind_dep_await(struct i915_address_space *vm,
				     struct i915_sw_fence *sw_fence,
				     u64 first,
				     u64 last,
				     bool intr,
				     gfp_t gfp);

void i915_vma_resource_bind_dep_sync_all(struct i915_address_space *vm);

void i915_vma_resource_module_exit(void);

int i915_vma_resource_module_init(void);

#endif