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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2018 The Linux Foundation. All rights reserved. */
#include <linux/dma-mapping.h>
#include "msm_drv.h"
#include "msm_mmu.h"
#include "adreno/adreno_gpu.h"
#include "adreno/a2xx.xml.h"
struct msm_gpummu {
struct msm_mmu base;
struct msm_gpu *gpu;
dma_addr_t pt_base;
uint32_t *table;
};
#define to_msm_gpummu(x) container_of(x, struct msm_gpummu, base)
#define GPUMMU_VA_START SZ_16M
#define GPUMMU_VA_RANGE (0xfff * SZ_64K)
#define GPUMMU_PAGE_SIZE SZ_4K
#define TABLE_SIZE (sizeof(uint32_t) * GPUMMU_VA_RANGE / GPUMMU_PAGE_SIZE)
static void msm_gpummu_detach(struct msm_mmu *mmu)
{
}
static int msm_gpummu_map(struct msm_mmu *mmu, uint64_t iova,
struct sg_table *sgt, size_t len, int prot)
{
struct msm_gpummu *gpummu = to_msm_gpummu(mmu);
unsigned idx = (iova - GPUMMU_VA_START) / GPUMMU_PAGE_SIZE;
struct sg_dma_page_iter dma_iter;
unsigned prot_bits = 0;
if (prot & IOMMU_WRITE)
prot_bits |= 1;
if (prot & IOMMU_READ)
prot_bits |= 2;
for_each_sgtable_dma_page(sgt, &dma_iter, 0) {
dma_addr_t addr = sg_page_iter_dma_address(&dma_iter);
int i;
for (i = 0; i < PAGE_SIZE; i += GPUMMU_PAGE_SIZE)
gpummu->table[idx++] = (addr + i) | prot_bits;
}
/* we can improve by deferring flush for multiple map() */
gpu_write(gpummu->gpu, REG_A2XX_MH_MMU_INVALIDATE,
A2XX_MH_MMU_INVALIDATE_INVALIDATE_ALL |
A2XX_MH_MMU_INVALIDATE_INVALIDATE_TC);
return 0;
}
static int msm_gpummu_unmap(struct msm_mmu *mmu, uint64_t iova, size_t len)
{
struct msm_gpummu *gpummu = to_msm_gpummu(mmu);
unsigned idx = (iova - GPUMMU_VA_START) / GPUMMU_PAGE_SIZE;
unsigned i;
for (i = 0; i < len / GPUMMU_PAGE_SIZE; i++, idx++)
gpummu->table[idx] = 0;
gpu_write(gpummu->gpu, REG_A2XX_MH_MMU_INVALIDATE,
A2XX_MH_MMU_INVALIDATE_INVALIDATE_ALL |
A2XX_MH_MMU_INVALIDATE_INVALIDATE_TC);
return 0;
}
static void msm_gpummu_destroy(struct msm_mmu *mmu)
{
struct msm_gpummu *gpummu = to_msm_gpummu(mmu);
dma_free_attrs(mmu->dev, TABLE_SIZE, gpummu->table, gpummu->pt_base,
DMA_ATTR_FORCE_CONTIGUOUS);
kfree(gpummu);
}
static const struct msm_mmu_funcs funcs = {
.detach = msm_gpummu_detach,
.map = msm_gpummu_map,
.unmap = msm_gpummu_unmap,
.destroy = msm_gpummu_destroy,
};
struct msm_mmu *msm_gpummu_new(struct device *dev, struct msm_gpu *gpu)
{
struct msm_gpummu *gpummu;
gpummu = kzalloc(sizeof(*gpummu), GFP_KERNEL);
if (!gpummu)
return ERR_PTR(-ENOMEM);
gpummu->table = dma_alloc_attrs(dev, TABLE_SIZE + 32, &gpummu->pt_base,
GFP_KERNEL | __GFP_ZERO, DMA_ATTR_FORCE_CONTIGUOUS);
if (!gpummu->table) {
kfree(gpummu);
return ERR_PTR(-ENOMEM);
}
gpummu->gpu = gpu;
msm_mmu_init(&gpummu->base, dev, &funcs, MSM_MMU_GPUMMU);
return &gpummu->base;
}
void msm_gpummu_params(struct msm_mmu *mmu, dma_addr_t *pt_base,
dma_addr_t *tran_error)
{
dma_addr_t base = to_msm_gpummu(mmu)->pt_base;
*pt_base = base;
*tran_error = base + TABLE_SIZE; /* 32-byte aligned */
}
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