1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2018 The Linux Foundation. All rights reserved. */
4 #include <linux/dma-mapping.h>
8 #include "adreno/adreno_gpu.h"
9 #include "adreno/a2xx.xml.h"
17 #define to_msm_gpummu(x) container_of(x, struct msm_gpummu, base)
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)
24 static void msm_gpummu_detach(struct msm_mmu *mmu)
28 static int msm_gpummu_map(struct msm_mmu *mmu, uint64_t iova,
29 struct sg_table *sgt, size_t len, int prot)
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;
37 if (prot & IOMMU_WRITE)
39 if (prot & IOMMU_READ)
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;
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);
57 static int msm_gpummu_unmap(struct msm_mmu *mmu, uint64_t iova, size_t len)
59 struct msm_gpummu *gpummu = to_msm_gpummu(mmu);
60 unsigned idx = (iova - GPUMMU_VA_START) / GPUMMU_PAGE_SIZE;
63 for (i = 0; i < len / GPUMMU_PAGE_SIZE; i++, idx++)
64 gpummu->table[idx] = 0;
66 gpu_write(gpummu->gpu, REG_A2XX_MH_MMU_INVALIDATE,
67 A2XX_MH_MMU_INVALIDATE_INVALIDATE_ALL |
68 A2XX_MH_MMU_INVALIDATE_INVALIDATE_TC);
72 static void msm_gpummu_destroy(struct msm_mmu *mmu)
74 struct msm_gpummu *gpummu = to_msm_gpummu(mmu);
76 dma_free_attrs(mmu->dev, TABLE_SIZE, gpummu->table, gpummu->pt_base,
77 DMA_ATTR_FORCE_CONTIGUOUS);
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,
89 struct msm_mmu *msm_gpummu_new(struct device *dev, struct msm_gpu *gpu)
91 struct msm_gpummu *gpummu;
93 gpummu = kzalloc(sizeof(*gpummu), GFP_KERNEL);
95 return ERR_PTR(-ENOMEM);
97 gpummu->table = dma_alloc_attrs(dev, TABLE_SIZE + 32, &gpummu->pt_base,
98 GFP_KERNEL | __GFP_ZERO, DMA_ATTR_FORCE_CONTIGUOUS);
101 return ERR_PTR(-ENOMEM);
105 msm_mmu_init(&gpummu->base, dev, &funcs);
107 return &gpummu->base;
110 void msm_gpummu_params(struct msm_mmu *mmu, dma_addr_t *pt_base,
111 dma_addr_t *tran_error)
113 dma_addr_t base = to_msm_gpummu(mmu)->pt_base;
116 *tran_error = base + TABLE_SIZE; /* 32-byte aligned */