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Merge tag 'for_v5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs
[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 void msm_gpummu_detach(struct msm_mmu *mmu)
25 {
26 }
27
28 static int msm_gpummu_map(struct msm_mmu *mmu, uint64_t iova,
29                 struct sg_table *sgt, size_t len, int prot)
30 {
31         struct msm_gpummu *gpummu = to_msm_gpummu(mmu);
32         unsigned idx = (iova - GPUMMU_VA_START) / GPUMMU_PAGE_SIZE;
33         struct scatterlist *sg;
34         unsigned prot_bits = 0;
35         unsigned i, j;
36
37         if (prot & IOMMU_WRITE)
38                 prot_bits |= 1;
39         if (prot & IOMMU_READ)
40                 prot_bits |= 2;
41
42         for_each_sg(sgt->sgl, sg, sgt->nents, i) {
43                 dma_addr_t addr = sg->dma_address;
44                 for (j = 0; j < sg->length / GPUMMU_PAGE_SIZE; j++, idx++) {
45                         gpummu->table[idx] = addr | prot_bits;
46                         addr += GPUMMU_PAGE_SIZE;
47                 }
48         }
49
50         /* we can improve by deferring flush for multiple map() */
51         gpu_write(gpummu->gpu, REG_A2XX_MH_MMU_INVALIDATE,
52                 A2XX_MH_MMU_INVALIDATE_INVALIDATE_ALL |
53                 A2XX_MH_MMU_INVALIDATE_INVALIDATE_TC);
54         return 0;
55 }
56
57 static int msm_gpummu_unmap(struct msm_mmu *mmu, uint64_t iova, size_t len)
58 {
59         struct msm_gpummu *gpummu = to_msm_gpummu(mmu);
60         unsigned idx = (iova - GPUMMU_VA_START) / GPUMMU_PAGE_SIZE;
61         unsigned i;
62
63         for (i = 0; i < len / GPUMMU_PAGE_SIZE; i++, idx++)
64                 gpummu->table[idx] = 0;
65
66         gpu_write(gpummu->gpu, REG_A2XX_MH_MMU_INVALIDATE,
67                 A2XX_MH_MMU_INVALIDATE_INVALIDATE_ALL |
68                 A2XX_MH_MMU_INVALIDATE_INVALIDATE_TC);
69         return 0;
70 }
71
72 static void msm_gpummu_destroy(struct msm_mmu *mmu)
73 {
74         struct msm_gpummu *gpummu = to_msm_gpummu(mmu);
75
76         dma_free_attrs(mmu->dev, TABLE_SIZE, gpummu->table, gpummu->pt_base,
77                 DMA_ATTR_FORCE_CONTIGUOUS);
78
79         kfree(gpummu);
80 }
81
82 static const struct msm_mmu_funcs funcs = {
83                 .detach = msm_gpummu_detach,
84                 .map = msm_gpummu_map,
85                 .unmap = msm_gpummu_unmap,
86                 .destroy = msm_gpummu_destroy,
87 };
88
89 struct msm_mmu *msm_gpummu_new(struct device *dev, struct msm_gpu *gpu)
90 {
91         struct msm_gpummu *gpummu;
92
93         gpummu = kzalloc(sizeof(*gpummu), GFP_KERNEL);
94         if (!gpummu)
95                 return ERR_PTR(-ENOMEM);
96
97         gpummu->table = dma_alloc_attrs(dev, TABLE_SIZE + 32, &gpummu->pt_base,
98                 GFP_KERNEL | __GFP_ZERO, DMA_ATTR_FORCE_CONTIGUOUS);
99         if (!gpummu->table) {
100                 kfree(gpummu);
101                 return ERR_PTR(-ENOMEM);
102         }
103
104         gpummu->gpu = gpu;
105         msm_mmu_init(&gpummu->base, dev, &funcs);
106
107         return &gpummu->base;
108 }
109
110 void msm_gpummu_params(struct msm_mmu *mmu, dma_addr_t *pt_base,
111                 dma_addr_t *tran_error)
112 {
113         dma_addr_t base = to_msm_gpummu(mmu)->pt_base;
114
115         *pt_base = base;
116         *tran_error = base + TABLE_SIZE; /* 32-byte aligned */
117 }
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