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linux-next/drivers/gpu/drm/etnaviv/etnaviv_iommu_v2.c
Lucas Stach 9912b4db7b drm/etnaviv: get cmdbuf physical address through the cmdbuf abstraction 
Don't allow IOMMUv2 to peek directly into the cmdbuf, but get the
needed PA through a dedicated function.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
2017-02-02 10:30:27 +01:00

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/*
* Copyright (C) 2016 Etnaviv Project
*
* 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_cmdbuf.h"
#include "etnaviv_gpu.h"
#include "etnaviv_mmu.h"
#include "etnaviv_iommu.h"
#include "state.xml.h"
#include "state_hi.xml.h"
#define MMUv2_PTE_PRESENT BIT(0)
#define MMUv2_PTE_EXCEPTION BIT(1)
#define MMUv2_PTE_WRITEABLE BIT(2)
#define MMUv2_MTLB_MASK 0xffc00000
#define MMUv2_MTLB_SHIFT 22
#define MMUv2_STLB_MASK 0x003ff000
#define MMUv2_STLB_SHIFT 12
#define MMUv2_MAX_STLB_ENTRIES 1024
struct etnaviv_iommuv2_domain {
struct iommu_domain domain;
struct device *dev;
void *bad_page_cpu;
dma_addr_t bad_page_dma;
/* M(aster) TLB aka first level pagetable */
u32 *mtlb_cpu;
dma_addr_t mtlb_dma;
/* S(lave) TLB aka second level pagetable */
u32 *stlb_cpu[1024];
dma_addr_t stlb_dma[1024];
};
static struct etnaviv_iommuv2_domain *to_etnaviv_domain(struct iommu_domain *domain)
{
return container_of(domain, struct etnaviv_iommuv2_domain, domain);
}
static int etnaviv_iommuv2_map(struct iommu_domain *domain, unsigned long iova,
phys_addr_t paddr, size_t size, int prot)
{
struct etnaviv_iommuv2_domain *etnaviv_domain =
to_etnaviv_domain(domain);
int mtlb_entry, stlb_entry;
u32 entry = (u32)paddr | MMUv2_PTE_PRESENT;
if (size != SZ_4K)
return -EINVAL;
if (prot & IOMMU_WRITE)
entry |= MMUv2_PTE_WRITEABLE;
mtlb_entry = (iova & MMUv2_MTLB_MASK) >> MMUv2_MTLB_SHIFT;
stlb_entry = (iova & MMUv2_STLB_MASK) >> MMUv2_STLB_SHIFT;
etnaviv_domain->stlb_cpu[mtlb_entry][stlb_entry] = entry;
return 0;
}
static size_t etnaviv_iommuv2_unmap(struct iommu_domain *domain,
unsigned long iova, size_t size)
{
struct etnaviv_iommuv2_domain *etnaviv_domain =
to_etnaviv_domain(domain);
int mtlb_entry, stlb_entry;
if (size != SZ_4K)
return -EINVAL;
mtlb_entry = (iova & MMUv2_MTLB_MASK) >> MMUv2_MTLB_SHIFT;
stlb_entry = (iova & MMUv2_STLB_MASK) >> MMUv2_STLB_SHIFT;
etnaviv_domain->stlb_cpu[mtlb_entry][stlb_entry] = MMUv2_PTE_EXCEPTION;
return SZ_4K;
}
static phys_addr_t etnaviv_iommuv2_iova_to_phys(struct iommu_domain *domain,
dma_addr_t iova)
{
struct etnaviv_iommuv2_domain *etnaviv_domain =
to_etnaviv_domain(domain);
int mtlb_entry, stlb_entry;
mtlb_entry = (iova & MMUv2_MTLB_MASK) >> MMUv2_MTLB_SHIFT;
stlb_entry = (iova & MMUv2_STLB_MASK) >> MMUv2_STLB_SHIFT;
return etnaviv_domain->stlb_cpu[mtlb_entry][stlb_entry] & ~(SZ_4K - 1);
}
static int etnaviv_iommuv2_init(struct etnaviv_iommuv2_domain *etnaviv_domain)
{
u32 *p;
int ret, i, j;
/* allocate scratch page */
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) {
ret = -ENOMEM;
goto fail_mem;
}
p = etnaviv_domain->bad_page_cpu;
for (i = 0; i < SZ_4K / 4; i++)
*p++ = 0xdead55aa;
etnaviv_domain->mtlb_cpu = dma_alloc_coherent(etnaviv_domain->dev,
SZ_4K,
&etnaviv_domain->mtlb_dma,
GFP_KERNEL);
if (!etnaviv_domain->mtlb_cpu) {
ret = -ENOMEM;
goto fail_mem;
}
/* pre-populate STLB pages (may want to switch to on-demand later) */
for (i = 0; i < MMUv2_MAX_STLB_ENTRIES; i++) {
etnaviv_domain->stlb_cpu[i] =
dma_alloc_coherent(etnaviv_domain->dev,
SZ_4K,
&etnaviv_domain->stlb_dma[i],
GFP_KERNEL);
if (!etnaviv_domain->stlb_cpu[i]) {
ret = -ENOMEM;
goto fail_mem;
}
p = etnaviv_domain->stlb_cpu[i];
for (j = 0; j < SZ_4K / 4; j++)
*p++ = MMUv2_PTE_EXCEPTION;
etnaviv_domain->mtlb_cpu[i] = etnaviv_domain->stlb_dma[i] |
MMUv2_PTE_PRESENT;
}
return 0;
fail_mem:
if (etnaviv_domain->bad_page_cpu)
dma_free_coherent(etnaviv_domain->dev, SZ_4K,
etnaviv_domain->bad_page_cpu,
etnaviv_domain->bad_page_dma);
if (etnaviv_domain->mtlb_cpu)
dma_free_coherent(etnaviv_domain->dev, SZ_4K,
etnaviv_domain->mtlb_cpu,
etnaviv_domain->mtlb_dma);
for (i = 0; i < MMUv2_MAX_STLB_ENTRIES; i++) {
if (etnaviv_domain->stlb_cpu[i])
dma_free_coherent(etnaviv_domain->dev, SZ_4K,
etnaviv_domain->stlb_cpu[i],
etnaviv_domain->stlb_dma[i]);
}
return ret;
}
static void etnaviv_iommuv2_domain_free(struct iommu_domain *domain)
{
struct etnaviv_iommuv2_domain *etnaviv_domain =
to_etnaviv_domain(domain);
int i;
dma_free_coherent(etnaviv_domain->dev, SZ_4K,
etnaviv_domain->bad_page_cpu,
etnaviv_domain->bad_page_dma);
dma_free_coherent(etnaviv_domain->dev, SZ_4K,
etnaviv_domain->mtlb_cpu,
etnaviv_domain->mtlb_dma);
for (i = 0; i < MMUv2_MAX_STLB_ENTRIES; i++) {
if (etnaviv_domain->stlb_cpu[i])
dma_free_coherent(etnaviv_domain->dev, SZ_4K,
etnaviv_domain->stlb_cpu[i],
etnaviv_domain->stlb_dma[i]);
}
vfree(etnaviv_domain);
}
static size_t etnaviv_iommuv2_dump_size(struct iommu_domain *domain)
{
struct etnaviv_iommuv2_domain *etnaviv_domain =
to_etnaviv_domain(domain);
size_t dump_size = SZ_4K;
int i;
for (i = 0; i < MMUv2_MAX_STLB_ENTRIES; i++)
if (etnaviv_domain->mtlb_cpu[i] & MMUv2_PTE_PRESENT)
dump_size += SZ_4K;
return dump_size;
}
static void etnaviv_iommuv2_dump(struct iommu_domain *domain, void *buf)
{
struct etnaviv_iommuv2_domain *etnaviv_domain =
to_etnaviv_domain(domain);
int i;
memcpy(buf, etnaviv_domain->mtlb_cpu, SZ_4K);
buf += SZ_4K;
for (i = 0; i < MMUv2_MAX_STLB_ENTRIES; i++, buf += SZ_4K)
if (etnaviv_domain->mtlb_cpu[i] & MMUv2_PTE_PRESENT)
memcpy(buf, etnaviv_domain->stlb_cpu[i], SZ_4K);
}
static const struct etnaviv_iommu_ops etnaviv_iommu_ops = {
.ops = {
.domain_free = etnaviv_iommuv2_domain_free,
.map = etnaviv_iommuv2_map,
.unmap = etnaviv_iommuv2_unmap,
.iova_to_phys = etnaviv_iommuv2_iova_to_phys,
.pgsize_bitmap = SZ_4K,
},
.dump_size = etnaviv_iommuv2_dump_size,
.dump = etnaviv_iommuv2_dump,
};
void etnaviv_iommuv2_restore(struct etnaviv_gpu *gpu)
{
struct etnaviv_iommuv2_domain *etnaviv_domain =
to_etnaviv_domain(gpu->mmu->domain);
u16 prefetch;
/* If the MMU is already enabled the state is still there. */
if (gpu_read(gpu, VIVS_MMUv2_CONTROL) & VIVS_MMUv2_CONTROL_ENABLE)
return;
prefetch = etnaviv_buffer_config_mmuv2(gpu,
(u32)etnaviv_domain->mtlb_dma,
(u32)etnaviv_domain->bad_page_dma);
etnaviv_gpu_start_fe(gpu, (u32)etnaviv_cmdbuf_get_pa(gpu->buffer),
prefetch);
etnaviv_gpu_wait_idle(gpu, 100);
gpu_write(gpu, VIVS_MMUv2_CONTROL, VIVS_MMUv2_CONTROL_ENABLE);
}
struct iommu_domain *etnaviv_iommuv2_domain_alloc(struct etnaviv_gpu *gpu)
{
struct etnaviv_iommuv2_domain *etnaviv_domain;
int ret;
etnaviv_domain = vzalloc(sizeof(*etnaviv_domain));
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.pgsize_bitmap = SZ_4K;
etnaviv_domain->domain.geometry.aperture_start = 0;
etnaviv_domain->domain.geometry.aperture_end = ~0UL & ~(SZ_4K - 1);
ret = etnaviv_iommuv2_init(etnaviv_domain);
if (ret)
goto out_free;
return &etnaviv_domain->domain;
out_free:
vfree(etnaviv_domain);
return NULL;
}
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