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