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
11struct 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
24static void msm_gpummu_detach(struct msm_mmu *mmu)
25{
26}
27
28static 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 sg_dma_page_iter dma_iter;
34	unsigned prot_bits = 0;
35
36	if (prot & IOMMU_WRITE)
37		prot_bits |= 1;
38	if (prot & IOMMU_READ)
39		prot_bits |= 2;
40
41	for_each_sgtable_dma_page(sgt, &dma_iter, 0) {
42		dma_addr_t addr = sg_page_iter_dma_address(&dma_iter);
43		int i;
44
45		for (i = 0; i < PAGE_SIZE; i += GPUMMU_PAGE_SIZE)
46			gpummu->table[idx++] = (addr + i) | prot_bits;
47	}
48
49	/* we can improve by deferring flush for multiple map() */
50	gpu_write(gpummu->gpu, REG_A2XX_MH_MMU_INVALIDATE,
51		A2XX_MH_MMU_INVALIDATE_INVALIDATE_ALL |
52		A2XX_MH_MMU_INVALIDATE_INVALIDATE_TC);
53	return 0;
54}
55
56static int msm_gpummu_unmap(struct msm_mmu *mmu, uint64_t iova, size_t len)
57{
58	struct msm_gpummu *gpummu = to_msm_gpummu(mmu);
59	unsigned idx = (iova - GPUMMU_VA_START) / GPUMMU_PAGE_SIZE;
60	unsigned i;
61
62	for (i = 0; i < len / GPUMMU_PAGE_SIZE; i++, idx++)
63                gpummu->table[idx] = 0;
64
65	gpu_write(gpummu->gpu, REG_A2XX_MH_MMU_INVALIDATE,
66		A2XX_MH_MMU_INVALIDATE_INVALIDATE_ALL |
67		A2XX_MH_MMU_INVALIDATE_INVALIDATE_TC);
68	return 0;
69}
70
71static void msm_gpummu_resume_translation(struct msm_mmu *mmu)
72{
73}
74
75static void msm_gpummu_destroy(struct msm_mmu *mmu)
76{
77	struct msm_gpummu *gpummu = to_msm_gpummu(mmu);
78
79	dma_free_attrs(mmu->dev, TABLE_SIZE, gpummu->table, gpummu->pt_base,
80		DMA_ATTR_FORCE_CONTIGUOUS);
81
82	kfree(gpummu);
83}
84
85static const struct msm_mmu_funcs funcs = {
86		.detach = msm_gpummu_detach,
87		.map = msm_gpummu_map,
88		.unmap = msm_gpummu_unmap,
89		.destroy = msm_gpummu_destroy,
90		.resume_translation = msm_gpummu_resume_translation,
91};
92
93struct msm_mmu *msm_gpummu_new(struct device *dev, struct msm_gpu *gpu)
94{
95	struct msm_gpummu *gpummu;
96
97	gpummu = kzalloc(sizeof(*gpummu), GFP_KERNEL);
98	if (!gpummu)
99		return ERR_PTR(-ENOMEM);
100
101	gpummu->table = dma_alloc_attrs(dev, TABLE_SIZE + 32, &gpummu->pt_base,
102		GFP_KERNEL | __GFP_ZERO, DMA_ATTR_FORCE_CONTIGUOUS);
103	if (!gpummu->table) {
104		kfree(gpummu);
105		return ERR_PTR(-ENOMEM);
106	}
107
108	gpummu->gpu = gpu;
109	msm_mmu_init(&gpummu->base, dev, &funcs, MSM_MMU_GPUMMU);
110
111	return &gpummu->base;
112}
113
114void msm_gpummu_params(struct msm_mmu *mmu, dma_addr_t *pt_base,
115		dma_addr_t *tran_error)
116{
117	dma_addr_t base = to_msm_gpummu(mmu)->pt_base;
118
119	*pt_base = base;
120	*tran_error = base + TABLE_SIZE; /* 32-byte aligned */
121}
122