linux/drivers/gpu/drm/etnaviv/etnaviv_mmu.c

415 lines
9.8 KiB
C

/*
* Copyright (C) 2015 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 "common.xml.h"
#include "etnaviv_cmdbuf.h"
#include "etnaviv_drv.h"
#include "etnaviv_gem.h"
#include "etnaviv_gpu.h"
#include "etnaviv_iommu.h"
#include "etnaviv_mmu.h"
static void etnaviv_domain_unmap(struct etnaviv_iommu_domain *domain,
unsigned long iova, size_t size)
{
size_t unmapped_page, unmapped = 0;
size_t pgsize = SZ_4K;
if (!IS_ALIGNED(iova | size, pgsize)) {
pr_err("unaligned: iova 0x%lx size 0x%zx min_pagesz 0x%x\n",
iova, size, pgsize);
return;
}
while (unmapped < size) {
unmapped_page = domain->ops->unmap(domain, iova, pgsize);
if (!unmapped_page)
break;
iova += unmapped_page;
unmapped += unmapped_page;
}
}
static int etnaviv_domain_map(struct etnaviv_iommu_domain *domain,
unsigned long iova, phys_addr_t paddr,
size_t size, int prot)
{
unsigned long orig_iova = iova;
size_t pgsize = SZ_4K;
size_t orig_size = size;
int ret = 0;
if (!IS_ALIGNED(iova | paddr | size, pgsize)) {
pr_err("unaligned: iova 0x%lx pa %pa size 0x%zx min_pagesz 0x%x\n",
iova, &paddr, size, pgsize);
return -EINVAL;
}
while (size) {
ret = domain->ops->map(domain, iova, paddr, pgsize, prot);
if (ret)
break;
iova += pgsize;
paddr += pgsize;
size -= pgsize;
}
/* unroll mapping in case something went wrong */
if (ret)
etnaviv_domain_unmap(domain, orig_iova, orig_size - size);
return ret;
}
static int etnaviv_iommu_map(struct etnaviv_iommu *iommu, u32 iova,
struct sg_table *sgt, unsigned len, int prot)
{
struct etnaviv_iommu_domain *domain = iommu->domain;
struct scatterlist *sg;
unsigned int da = iova;
unsigned int i, j;
int ret;
if (!domain || !sgt)
return -EINVAL;
for_each_sg(sgt->sgl, sg, sgt->nents, i) {
u32 pa = sg_dma_address(sg) - sg->offset;
size_t bytes = sg_dma_len(sg) + sg->offset;
VERB("map[%d]: %08x %08x(%zx)", i, iova, pa, bytes);
ret = etnaviv_domain_map(domain, da, pa, bytes, prot);
if (ret)
goto fail;
da += bytes;
}
return 0;
fail:
da = iova;
for_each_sg(sgt->sgl, sg, i, j) {
size_t bytes = sg_dma_len(sg) + sg->offset;
etnaviv_domain_unmap(domain, da, bytes);
da += bytes;
}
return ret;
}
static void etnaviv_iommu_unmap(struct etnaviv_iommu *iommu, u32 iova,
struct sg_table *sgt, unsigned len)
{
struct etnaviv_iommu_domain *domain = iommu->domain;
struct scatterlist *sg;
unsigned int da = iova;
int i;
for_each_sg(sgt->sgl, sg, sgt->nents, i) {
size_t bytes = sg_dma_len(sg) + sg->offset;
etnaviv_domain_unmap(domain, da, bytes);
VERB("unmap[%d]: %08x(%zx)", i, iova, bytes);
BUG_ON(!PAGE_ALIGNED(bytes));
da += bytes;
}
}
static void etnaviv_iommu_remove_mapping(struct etnaviv_iommu *mmu,
struct etnaviv_vram_mapping *mapping)
{
struct etnaviv_gem_object *etnaviv_obj = mapping->object;
etnaviv_iommu_unmap(mmu, mapping->vram_node.start,
etnaviv_obj->sgt, etnaviv_obj->base.size);
drm_mm_remove_node(&mapping->vram_node);
}
static int etnaviv_iommu_find_iova(struct etnaviv_iommu *mmu,
struct drm_mm_node *node, size_t size)
{
struct etnaviv_vram_mapping *free = NULL;
enum drm_mm_insert_mode mode = DRM_MM_INSERT_LOW;
int ret;
lockdep_assert_held(&mmu->lock);
while (1) {
struct etnaviv_vram_mapping *m, *n;
struct drm_mm_scan scan;
struct list_head list;
bool found;
ret = drm_mm_insert_node_in_range(&mmu->mm, node,
size, 0, 0,
mmu->last_iova, U64_MAX,
mode);
if (ret != -ENOSPC)
break;
/*
* If we did not search from the start of the MMU region,
* try again in case there are free slots.
*/
if (mmu->last_iova) {
mmu->last_iova = 0;
mmu->need_flush = true;
continue;
}
/* Try to retire some entries */
drm_mm_scan_init(&scan, &mmu->mm, size, 0, 0, mode);
found = 0;
INIT_LIST_HEAD(&list);
list_for_each_entry(free, &mmu->mappings, mmu_node) {
/* If this vram node has not been used, skip this. */
if (!free->vram_node.mm)
continue;
/*
* If the iova is pinned, then it's in-use,
* so we must keep its mapping.
*/
if (free->use)
continue;
list_add(&free->scan_node, &list);
if (drm_mm_scan_add_block(&scan, &free->vram_node)) {
found = true;
break;
}
}
if (!found) {
/* Nothing found, clean up and fail */
list_for_each_entry_safe(m, n, &list, scan_node)
BUG_ON(drm_mm_scan_remove_block(&scan, &m->vram_node));
break;
}
/*
* drm_mm does not allow any other operations while
* scanning, so we have to remove all blocks first.
* If drm_mm_scan_remove_block() returns false, we
* can leave the block pinned.
*/
list_for_each_entry_safe(m, n, &list, scan_node)
if (!drm_mm_scan_remove_block(&scan, &m->vram_node))
list_del_init(&m->scan_node);
/*
* Unmap the blocks which need to be reaped from the MMU.
* Clear the mmu pointer to prevent the mapping_get finding
* this mapping.
*/
list_for_each_entry_safe(m, n, &list, scan_node) {
etnaviv_iommu_remove_mapping(mmu, m);
m->mmu = NULL;
list_del_init(&m->mmu_node);
list_del_init(&m->scan_node);
}
mode = DRM_MM_INSERT_EVICT;
/*
* We removed enough mappings so that the new allocation will
* succeed, retry the allocation one more time.
*/
}
return ret;
}
int etnaviv_iommu_map_gem(struct etnaviv_iommu *mmu,
struct etnaviv_gem_object *etnaviv_obj, u32 memory_base,
struct etnaviv_vram_mapping *mapping)
{
struct sg_table *sgt = etnaviv_obj->sgt;
struct drm_mm_node *node;
int ret;
lockdep_assert_held(&etnaviv_obj->lock);
mutex_lock(&mmu->lock);
/* v1 MMU can optimize single entry (contiguous) scatterlists */
if (mmu->version == ETNAVIV_IOMMU_V1 &&
sgt->nents == 1 && !(etnaviv_obj->flags & ETNA_BO_FORCE_MMU)) {
u32 iova;
iova = sg_dma_address(sgt->sgl) - memory_base;
if (iova < 0x80000000 - sg_dma_len(sgt->sgl)) {
mapping->iova = iova;
list_add_tail(&mapping->mmu_node, &mmu->mappings);
ret = 0;
goto unlock;
}
}
node = &mapping->vram_node;
ret = etnaviv_iommu_find_iova(mmu, node, etnaviv_obj->base.size);
if (ret < 0)
goto unlock;
mmu->last_iova = node->start + etnaviv_obj->base.size;
mapping->iova = node->start;
ret = etnaviv_iommu_map(mmu, node->start, sgt, etnaviv_obj->base.size,
ETNAVIV_PROT_READ | ETNAVIV_PROT_WRITE);
if (ret < 0) {
drm_mm_remove_node(node);
goto unlock;
}
list_add_tail(&mapping->mmu_node, &mmu->mappings);
mmu->need_flush = true;
unlock:
mutex_unlock(&mmu->lock);
return ret;
}
void etnaviv_iommu_unmap_gem(struct etnaviv_iommu *mmu,
struct etnaviv_vram_mapping *mapping)
{
WARN_ON(mapping->use);
mutex_lock(&mmu->lock);
/* If the vram node is on the mm, unmap and remove the node */
if (mapping->vram_node.mm == &mmu->mm)
etnaviv_iommu_remove_mapping(mmu, mapping);
list_del(&mapping->mmu_node);
mmu->need_flush = true;
mutex_unlock(&mmu->lock);
}
void etnaviv_iommu_destroy(struct etnaviv_iommu *mmu)
{
drm_mm_takedown(&mmu->mm);
mmu->domain->ops->free(mmu->domain);
kfree(mmu);
}
struct etnaviv_iommu *etnaviv_iommu_new(struct etnaviv_gpu *gpu)
{
enum etnaviv_iommu_version version;
struct etnaviv_iommu *mmu;
mmu = kzalloc(sizeof(*mmu), GFP_KERNEL);
if (!mmu)
return ERR_PTR(-ENOMEM);
if (!(gpu->identity.minor_features1 & chipMinorFeatures1_MMU_VERSION)) {
mmu->domain = etnaviv_iommuv1_domain_alloc(gpu);
version = ETNAVIV_IOMMU_V1;
} else {
mmu->domain = etnaviv_iommuv2_domain_alloc(gpu);
version = ETNAVIV_IOMMU_V2;
}
if (!mmu->domain) {
dev_err(gpu->dev, "Failed to allocate GPU IOMMU domain\n");
kfree(mmu);
return ERR_PTR(-ENOMEM);
}
mmu->gpu = gpu;
mmu->version = version;
mutex_init(&mmu->lock);
INIT_LIST_HEAD(&mmu->mappings);
drm_mm_init(&mmu->mm, mmu->domain->base, mmu->domain->size);
return mmu;
}
void etnaviv_iommu_restore(struct etnaviv_gpu *gpu)
{
if (gpu->mmu->version == ETNAVIV_IOMMU_V1)
etnaviv_iommuv1_restore(gpu);
else
etnaviv_iommuv2_restore(gpu);
}
int etnaviv_iommu_get_suballoc_va(struct etnaviv_gpu *gpu, dma_addr_t paddr,
struct drm_mm_node *vram_node, size_t size,
u32 *iova)
{
struct etnaviv_iommu *mmu = gpu->mmu;
if (mmu->version == ETNAVIV_IOMMU_V1) {
*iova = paddr - gpu->memory_base;
return 0;
} else {
int ret;
mutex_lock(&mmu->lock);
ret = etnaviv_iommu_find_iova(mmu, vram_node, size);
if (ret < 0) {
mutex_unlock(&mmu->lock);
return ret;
}
ret = etnaviv_domain_map(mmu->domain, vram_node->start, paddr,
size, ETNAVIV_PROT_READ);
if (ret < 0) {
drm_mm_remove_node(vram_node);
mutex_unlock(&mmu->lock);
return ret;
}
mmu->last_iova = vram_node->start + size;
gpu->mmu->need_flush = true;
mutex_unlock(&mmu->lock);
*iova = (u32)vram_node->start;
return 0;
}
}
void etnaviv_iommu_put_suballoc_va(struct etnaviv_gpu *gpu,
struct drm_mm_node *vram_node, size_t size,
u32 iova)
{
struct etnaviv_iommu *mmu = gpu->mmu;
if (mmu->version == ETNAVIV_IOMMU_V2) {
mutex_lock(&mmu->lock);
etnaviv_domain_unmap(mmu->domain, iova, size);
drm_mm_remove_node(vram_node);
mutex_unlock(&mmu->lock);
}
}
size_t etnaviv_iommu_dump_size(struct etnaviv_iommu *iommu)
{
return iommu->domain->ops->dump_size(iommu->domain);
}
void etnaviv_iommu_dump(struct etnaviv_iommu *iommu, void *buf)
{
iommu->domain->ops->dump(iommu->domain, buf);
}