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
|
// SPDX-License-Identifier: MIT
/*
* Copyright © 2019 Intel Corporation
*/
#include "i915_drv.h"
#include "intel_memory_region.h"
#include "gem/i915_gem_lmem.h"
#include "gem/i915_gem_region.h"
#include "intel_region_lmem.h"
static int init_fake_lmem_bar(struct intel_memory_region *mem)
{
struct drm_i915_private *i915 = mem->i915;
struct i915_ggtt *ggtt = &i915->ggtt;
unsigned long n;
int ret;
/* We want to 1:1 map the mappable aperture to our reserved region */
mem->fake_mappable.start = 0;
mem->fake_mappable.size = resource_size(&mem->region);
mem->fake_mappable.color = I915_COLOR_UNEVICTABLE;
ret = drm_mm_reserve_node(&ggtt->vm.mm, &mem->fake_mappable);
if (ret)
return ret;
mem->remap_addr = dma_map_resource(&i915->drm.pdev->dev,
mem->region.start,
mem->fake_mappable.size,
PCI_DMA_BIDIRECTIONAL,
DMA_ATTR_FORCE_CONTIGUOUS);
if (dma_mapping_error(&i915->drm.pdev->dev, mem->remap_addr)) {
drm_mm_remove_node(&mem->fake_mappable);
return -EINVAL;
}
for (n = 0; n < mem->fake_mappable.size >> PAGE_SHIFT; ++n) {
ggtt->vm.insert_page(&ggtt->vm,
mem->remap_addr + (n << PAGE_SHIFT),
n << PAGE_SHIFT,
I915_CACHE_NONE, 0);
}
mem->region = (struct resource)DEFINE_RES_MEM(mem->remap_addr,
mem->fake_mappable.size);
return 0;
}
static void release_fake_lmem_bar(struct intel_memory_region *mem)
{
if (drm_mm_node_allocated(&mem->fake_mappable))
drm_mm_remove_node(&mem->fake_mappable);
dma_unmap_resource(&mem->i915->drm.pdev->dev,
mem->remap_addr,
mem->fake_mappable.size,
PCI_DMA_BIDIRECTIONAL,
DMA_ATTR_FORCE_CONTIGUOUS);
}
static void
region_lmem_release(struct intel_memory_region *mem)
{
release_fake_lmem_bar(mem);
io_mapping_fini(&mem->iomap);
intel_memory_region_release_buddy(mem);
}
static int
region_lmem_init(struct intel_memory_region *mem)
{
int ret;
if (i915_modparams.fake_lmem_start) {
ret = init_fake_lmem_bar(mem);
GEM_BUG_ON(ret);
}
if (!io_mapping_init_wc(&mem->iomap,
mem->io_start,
resource_size(&mem->region)))
return -EIO;
ret = intel_memory_region_init_buddy(mem);
if (ret)
io_mapping_fini(&mem->iomap);
return ret;
}
const struct intel_memory_region_ops intel_region_lmem_ops = {
.init = region_lmem_init,
.release = region_lmem_release,
.create_object = __i915_gem_lmem_object_create,
};
struct intel_memory_region *
intel_setup_fake_lmem(struct drm_i915_private *i915)
{
struct pci_dev *pdev = i915->drm.pdev;
struct intel_memory_region *mem;
resource_size_t mappable_end;
resource_size_t io_start;
resource_size_t start;
GEM_BUG_ON(i915_ggtt_has_aperture(&i915->ggtt));
GEM_BUG_ON(!i915_modparams.fake_lmem_start);
/* Your mappable aperture belongs to me now! */
mappable_end = pci_resource_len(pdev, 2);
io_start = pci_resource_start(pdev, 2),
start = i915_modparams.fake_lmem_start;
mem = intel_memory_region_create(i915,
start,
mappable_end,
PAGE_SIZE,
io_start,
&intel_region_lmem_ops);
if (!IS_ERR(mem)) {
DRM_INFO("Intel graphics fake LMEM: %pR\n", &mem->region);
DRM_INFO("Intel graphics fake LMEM IO start: %llx\n",
(u64)mem->io_start);
DRM_INFO("Intel graphics fake LMEM size: %llx\n",
(u64)resource_size(&mem->region));
}
return mem;
}
|
