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Merge branch 'work.dotdot1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[linux.git] / drivers / gpu / drm / msm / msm_gpummu.c
1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2018 The Linux Foundation. All rights reserved. */
3
4 #include <linux/dma-mapping.h>
5
6 #include "msm_drv.h"
7 #include "msm_mmu.h"
8 #include "adreno/adreno_gpu.h"
9 #include "adreno/a2xx.xml.h"
10
11 struct msm_gpummu {
12         struct msm_mmu base;
13         struct msm_gpu *gpu;
14         dma_addr_t pt_base;
15         uint32_t *table;
16 };
17 #define to_msm_gpummu(x) container_of(x, struct msm_gpummu, base)
18
19 #define GPUMMU_VA_START SZ_16M
20 #define GPUMMU_VA_RANGE (0xfff * SZ_64K)
21 #define GPUMMU_PAGE_SIZE SZ_4K
22 #define TABLE_SIZE (sizeof(uint32_t) * GPUMMU_VA_RANGE / GPUMMU_PAGE_SIZE)
23
24 static int msm_gpummu_attach(struct msm_mmu *mmu)
25 {
26         return 0;
27 }
28
29 static void msm_gpummu_detach(struct msm_mmu *mmu)
30 {
31 }
32
33 static int msm_gpummu_map(struct msm_mmu *mmu, uint64_t iova,
34                 struct sg_table *sgt, unsigned len, int prot)
35 {
36         struct msm_gpummu *gpummu = to_msm_gpummu(mmu);
37         unsigned idx = (iova - GPUMMU_VA_START) / GPUMMU_PAGE_SIZE;
38         struct scatterlist *sg;
39         unsigned prot_bits = 0;
40         unsigned i, j;
41
42         if (prot & IOMMU_WRITE)
43                 prot_bits |= 1;
44         if (prot & IOMMU_READ)
45                 prot_bits |= 2;
46
47         for_each_sg(sgt->sgl, sg, sgt->nents, i) {
48                 dma_addr_t addr = sg->dma_address;
49                 for (j = 0; j < sg->length / GPUMMU_PAGE_SIZE; j++, idx++) {
50                         gpummu->table[idx] = addr | prot_bits;
51                         addr += GPUMMU_PAGE_SIZE;
52                 }
53         }
54
55         /* we can improve by deferring flush for multiple map() */
56         gpu_write(gpummu->gpu, REG_A2XX_MH_MMU_INVALIDATE,
57                 A2XX_MH_MMU_INVALIDATE_INVALIDATE_ALL |
58                 A2XX_MH_MMU_INVALIDATE_INVALIDATE_TC);
59         return 0;
60 }
61
62 static int msm_gpummu_unmap(struct msm_mmu *mmu, uint64_t iova, unsigned len)
63 {
64         struct msm_gpummu *gpummu = to_msm_gpummu(mmu);
65         unsigned idx = (iova - GPUMMU_VA_START) / GPUMMU_PAGE_SIZE;
66         unsigned i;
67
68         for (i = 0; i < len / GPUMMU_PAGE_SIZE; i++, idx++)
69                 gpummu->table[idx] = 0;
70
71         gpu_write(gpummu->gpu, REG_A2XX_MH_MMU_INVALIDATE,
72                 A2XX_MH_MMU_INVALIDATE_INVALIDATE_ALL |
73                 A2XX_MH_MMU_INVALIDATE_INVALIDATE_TC);
74         return 0;
75 }
76
77 static void msm_gpummu_destroy(struct msm_mmu *mmu)
78 {
79         struct msm_gpummu *gpummu = to_msm_gpummu(mmu);
80
81         dma_free_attrs(mmu->dev, TABLE_SIZE, gpummu->table, gpummu->pt_base,
82                 DMA_ATTR_FORCE_CONTIGUOUS);
83
84         kfree(gpummu);
85 }
86
87 static const struct msm_mmu_funcs funcs = {
88                 .attach = msm_gpummu_attach,
89                 .detach = msm_gpummu_detach,
90                 .map = msm_gpummu_map,
91                 .unmap = msm_gpummu_unmap,
92                 .destroy = msm_gpummu_destroy,
93 };
94
95 struct msm_mmu *msm_gpummu_new(struct device *dev, struct msm_gpu *gpu)
96 {
97         struct msm_gpummu *gpummu;
98
99         gpummu = kzalloc(sizeof(*gpummu), GFP_KERNEL);
100         if (!gpummu)
101                 return ERR_PTR(-ENOMEM);
102
103         gpummu->table = dma_alloc_attrs(dev, TABLE_SIZE + 32, &gpummu->pt_base,
104                 GFP_KERNEL | __GFP_ZERO, DMA_ATTR_FORCE_CONTIGUOUS);
105         if (!gpummu->table) {
106                 kfree(gpummu);
107                 return ERR_PTR(-ENOMEM);
108         }
109
110         gpummu->gpu = gpu;
111         msm_mmu_init(&gpummu->base, dev, &funcs);
112
113         return &gpummu->base;
114 }
115
116 void msm_gpummu_params(struct msm_mmu *mmu, dma_addr_t *pt_base,
117                 dma_addr_t *tran_error)
118 {
119         dma_addr_t base = to_msm_gpummu(mmu)->pt_base;
120
121         *pt_base = base;
122         *tran_error = base + TABLE_SIZE; /* 32-byte aligned */
123 }
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