1// SPDX-License-Identifier: MIT
2/*
3 * Copyright © 2019 Intel Corporation
4 */
5
6#include "i915_drv.h"
7#include "intel_memory_region.h"
8#include "gem/i915_gem_lmem.h"
9#include "gem/i915_gem_region.h"
10#include "intel_region_lmem.h"
11
12static int init_fake_lmem_bar(struct intel_memory_region *mem)
13{
14	struct drm_i915_private *i915 = mem->i915;
15	struct i915_ggtt *ggtt = &i915->ggtt;
16	unsigned long n;
17	int ret;
18
19	/* We want to 1:1 map the mappable aperture to our reserved region */
20
21	mem->fake_mappable.start = 0;
22	mem->fake_mappable.size = resource_size(&mem->region);
23	mem->fake_mappable.color = I915_COLOR_UNEVICTABLE;
24
25	ret = drm_mm_reserve_node(&ggtt->vm.mm, &mem->fake_mappable);
26	if (ret)
27		return ret;
28
29	mem->remap_addr = dma_map_resource(&i915->drm.pdev->dev,
30					   mem->region.start,
31					   mem->fake_mappable.size,
32					   PCI_DMA_BIDIRECTIONAL,
33					   DMA_ATTR_FORCE_CONTIGUOUS);
34	if (dma_mapping_error(&i915->drm.pdev->dev, mem->remap_addr)) {
35		drm_mm_remove_node(&mem->fake_mappable);
36		return -EINVAL;
37	}
38
39	for (n = 0; n < mem->fake_mappable.size >> PAGE_SHIFT; ++n) {
40		ggtt->vm.insert_page(&ggtt->vm,
41				     mem->remap_addr + (n << PAGE_SHIFT),
42				     n << PAGE_SHIFT,
43				     I915_CACHE_NONE, 0);
44	}
45
46	mem->region = (struct resource)DEFINE_RES_MEM(mem->remap_addr,
47						      mem->fake_mappable.size);
48
49	return 0;
50}
51
52static void release_fake_lmem_bar(struct intel_memory_region *mem)
53{
54	if (!drm_mm_node_allocated(&mem->fake_mappable))
55		return;
56
57	drm_mm_remove_node(&mem->fake_mappable);
58
59	dma_unmap_resource(&mem->i915->drm.pdev->dev,
60			   mem->remap_addr,
61			   mem->fake_mappable.size,
62			   PCI_DMA_BIDIRECTIONAL,
63			   DMA_ATTR_FORCE_CONTIGUOUS);
64}
65
66static void
67region_lmem_release(struct intel_memory_region *mem)
68{
69	release_fake_lmem_bar(mem);
70	io_mapping_fini(&mem->iomap);
71	intel_memory_region_release_buddy(mem);
72}
73
74static int
75region_lmem_init(struct intel_memory_region *mem)
76{
77	int ret;
78
79	if (mem->i915->params.fake_lmem_start) {
80		ret = init_fake_lmem_bar(mem);
81		GEM_BUG_ON(ret);
82	}
83
84	if (!io_mapping_init_wc(&mem->iomap,
85				mem->io_start,
86				resource_size(&mem->region)))
87		return -EIO;
88
89	ret = intel_memory_region_init_buddy(mem);
90	if (ret)
91		io_mapping_fini(&mem->iomap);
92
93	intel_memory_region_set_name(mem, "local");
94
95	return ret;
96}
97
98const struct intel_memory_region_ops intel_region_lmem_ops = {
99	.init = region_lmem_init,
100	.release = region_lmem_release,
101	.create_object = __i915_gem_lmem_object_create,
102};
103
104struct intel_memory_region *
105intel_setup_fake_lmem(struct drm_i915_private *i915)
106{
107	struct pci_dev *pdev = i915->drm.pdev;
108	struct intel_memory_region *mem;
109	resource_size_t mappable_end;
110	resource_size_t io_start;
111	resource_size_t start;
112
113	GEM_BUG_ON(i915_ggtt_has_aperture(&i915->ggtt));
114	GEM_BUG_ON(!i915->params.fake_lmem_start);
115
116	/* Your mappable aperture belongs to me now! */
117	mappable_end = pci_resource_len(pdev, 2);
118	io_start = pci_resource_start(pdev, 2),
119	start = i915->params.fake_lmem_start;
120
121	mem = intel_memory_region_create(i915,
122					 start,
123					 mappable_end,
124					 PAGE_SIZE,
125					 io_start,
126					 &intel_region_lmem_ops);
127	if (!IS_ERR(mem)) {
128		drm_info(&i915->drm, "Intel graphics fake LMEM: %pR\n",
129			 &mem->region);
130		drm_info(&i915->drm,
131			 "Intel graphics fake LMEM IO start: %llx\n",
132			(u64)mem->io_start);
133		drm_info(&i915->drm, "Intel graphics fake LMEM size: %llx\n",
134			 (u64)resource_size(&mem->region));
135	}
136
137	return mem;
138}
139