249 lines
6.5 KiB
C
249 lines
6.5 KiB
C
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/*
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* Copyright (C) 2014 Christian Gmeiner <christian.gmeiner@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/iommu.h>
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#include <linux/platform_device.h>
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#include <linux/sizes.h>
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#include <linux/slab.h>
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#include <linux/dma-mapping.h>
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#include <linux/bitops.h>
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#include "etnaviv_gpu.h"
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#include "etnaviv_mmu.h"
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#include "etnaviv_iommu.h"
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#include "state_hi.xml.h"
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#define PT_SIZE SZ_2M
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#define PT_ENTRIES (PT_SIZE / sizeof(u32))
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#define GPU_MEM_START 0x80000000
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struct etnaviv_iommu_domain_pgtable {
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u32 *pgtable;
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dma_addr_t paddr;
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};
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struct etnaviv_iommu_domain {
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struct iommu_domain domain;
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struct device *dev;
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void *bad_page_cpu;
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dma_addr_t bad_page_dma;
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struct etnaviv_iommu_domain_pgtable pgtable;
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spinlock_t map_lock;
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};
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static struct etnaviv_iommu_domain *to_etnaviv_domain(struct iommu_domain *domain)
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{
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return container_of(domain, struct etnaviv_iommu_domain, domain);
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}
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static int pgtable_alloc(struct etnaviv_iommu_domain_pgtable *pgtable,
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size_t size)
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{
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pgtable->pgtable = dma_alloc_coherent(NULL, size, &pgtable->paddr, GFP_KERNEL);
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if (!pgtable->pgtable)
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return -ENOMEM;
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return 0;
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}
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static void pgtable_free(struct etnaviv_iommu_domain_pgtable *pgtable,
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size_t size)
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{
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dma_free_coherent(NULL, size, pgtable->pgtable, pgtable->paddr);
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}
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static u32 pgtable_read(struct etnaviv_iommu_domain_pgtable *pgtable,
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unsigned long iova)
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{
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/* calcuate index into page table */
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unsigned int index = (iova - GPU_MEM_START) / SZ_4K;
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phys_addr_t paddr;
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paddr = pgtable->pgtable[index];
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return paddr;
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}
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static void pgtable_write(struct etnaviv_iommu_domain_pgtable *pgtable,
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unsigned long iova, phys_addr_t paddr)
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{
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/* calcuate index into page table */
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unsigned int index = (iova - GPU_MEM_START) / SZ_4K;
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pgtable->pgtable[index] = paddr;
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}
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static int __etnaviv_iommu_init(struct etnaviv_iommu_domain *etnaviv_domain)
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{
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u32 *p;
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int ret, i;
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etnaviv_domain->bad_page_cpu = dma_alloc_coherent(etnaviv_domain->dev,
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SZ_4K,
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&etnaviv_domain->bad_page_dma,
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GFP_KERNEL);
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if (!etnaviv_domain->bad_page_cpu)
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return -ENOMEM;
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p = etnaviv_domain->bad_page_cpu;
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for (i = 0; i < SZ_4K / 4; i++)
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*p++ = 0xdead55aa;
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ret = pgtable_alloc(&etnaviv_domain->pgtable, PT_SIZE);
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if (ret < 0) {
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dma_free_coherent(etnaviv_domain->dev, SZ_4K,
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etnaviv_domain->bad_page_cpu,
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etnaviv_domain->bad_page_dma);
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return ret;
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}
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for (i = 0; i < PT_ENTRIES; i++)
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etnaviv_domain->pgtable.pgtable[i] =
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etnaviv_domain->bad_page_dma;
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spin_lock_init(&etnaviv_domain->map_lock);
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return 0;
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}
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static void etnaviv_domain_free(struct iommu_domain *domain)
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{
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struct etnaviv_iommu_domain *etnaviv_domain = to_etnaviv_domain(domain);
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pgtable_free(&etnaviv_domain->pgtable, PT_SIZE);
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dma_free_coherent(etnaviv_domain->dev, SZ_4K,
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etnaviv_domain->bad_page_cpu,
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etnaviv_domain->bad_page_dma);
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kfree(etnaviv_domain);
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}
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static int etnaviv_iommuv1_map(struct iommu_domain *domain, unsigned long iova,
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phys_addr_t paddr, size_t size, int prot)
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{
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struct etnaviv_iommu_domain *etnaviv_domain = to_etnaviv_domain(domain);
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if (size != SZ_4K)
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return -EINVAL;
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spin_lock(&etnaviv_domain->map_lock);
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pgtable_write(&etnaviv_domain->pgtable, iova, paddr);
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spin_unlock(&etnaviv_domain->map_lock);
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return 0;
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}
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static size_t etnaviv_iommuv1_unmap(struct iommu_domain *domain,
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unsigned long iova, size_t size)
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{
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struct etnaviv_iommu_domain *etnaviv_domain = to_etnaviv_domain(domain);
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if (size != SZ_4K)
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return -EINVAL;
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spin_lock(&etnaviv_domain->map_lock);
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pgtable_write(&etnaviv_domain->pgtable, iova,
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etnaviv_domain->bad_page_dma);
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spin_unlock(&etnaviv_domain->map_lock);
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return SZ_4K;
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}
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static phys_addr_t etnaviv_iommu_iova_to_phys(struct iommu_domain *domain,
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dma_addr_t iova)
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{
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struct etnaviv_iommu_domain *etnaviv_domain = to_etnaviv_domain(domain);
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return pgtable_read(&etnaviv_domain->pgtable, iova);
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}
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static size_t etnaviv_iommuv1_dump_size(struct iommu_domain *domain)
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{
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return PT_SIZE;
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}
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static void etnaviv_iommuv1_dump(struct iommu_domain *domain, void *buf)
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{
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struct etnaviv_iommu_domain *etnaviv_domain = to_etnaviv_domain(domain);
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memcpy(buf, etnaviv_domain->pgtable.pgtable, PT_SIZE);
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}
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static struct etnaviv_iommu_ops etnaviv_iommu_ops = {
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.ops = {
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.domain_free = etnaviv_domain_free,
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.map = etnaviv_iommuv1_map,
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.unmap = etnaviv_iommuv1_unmap,
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.iova_to_phys = etnaviv_iommu_iova_to_phys,
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.pgsize_bitmap = SZ_4K,
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},
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.dump_size = etnaviv_iommuv1_dump_size,
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.dump = etnaviv_iommuv1_dump,
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};
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void etnaviv_iommuv1_restore(struct etnaviv_gpu *gpu)
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{
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struct etnaviv_iommu_domain *etnaviv_domain =
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to_etnaviv_domain(gpu->mmu->domain);
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u32 pgtable;
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/* set base addresses */
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gpu_write(gpu, VIVS_MC_MEMORY_BASE_ADDR_RA, gpu->memory_base);
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gpu_write(gpu, VIVS_MC_MEMORY_BASE_ADDR_FE, gpu->memory_base);
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gpu_write(gpu, VIVS_MC_MEMORY_BASE_ADDR_TX, gpu->memory_base);
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gpu_write(gpu, VIVS_MC_MEMORY_BASE_ADDR_PEZ, gpu->memory_base);
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gpu_write(gpu, VIVS_MC_MEMORY_BASE_ADDR_PE, gpu->memory_base);
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/* set page table address in MC */
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pgtable = (u32)etnaviv_domain->pgtable.paddr;
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gpu_write(gpu, VIVS_MC_MMU_FE_PAGE_TABLE, pgtable);
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gpu_write(gpu, VIVS_MC_MMU_TX_PAGE_TABLE, pgtable);
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gpu_write(gpu, VIVS_MC_MMU_PE_PAGE_TABLE, pgtable);
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gpu_write(gpu, VIVS_MC_MMU_PEZ_PAGE_TABLE, pgtable);
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gpu_write(gpu, VIVS_MC_MMU_RA_PAGE_TABLE, pgtable);
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}
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struct iommu_domain *etnaviv_iommuv1_domain_alloc(struct etnaviv_gpu *gpu)
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{
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struct etnaviv_iommu_domain *etnaviv_domain;
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int ret;
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etnaviv_domain = kzalloc(sizeof(*etnaviv_domain), GFP_KERNEL);
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if (!etnaviv_domain)
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return NULL;
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etnaviv_domain->dev = gpu->dev;
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etnaviv_domain->domain.type = __IOMMU_DOMAIN_PAGING;
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etnaviv_domain->domain.ops = &etnaviv_iommu_ops.ops;
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etnaviv_domain->domain.pgsize_bitmap = SZ_4K;
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etnaviv_domain->domain.geometry.aperture_start = GPU_MEM_START;
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etnaviv_domain->domain.geometry.aperture_end = GPU_MEM_START + PT_ENTRIES * SZ_4K - 1;
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ret = __etnaviv_iommu_init(etnaviv_domain);
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if (ret)
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goto out_free;
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return &etnaviv_domain->domain;
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out_free:
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kfree(etnaviv_domain);
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return NULL;
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}
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