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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2015-2018 Etnaviv Project
*/
#include <linux/dma-mapping.h>
#include <linux/scatterlist.h>
#include "common.xml.h"
#include "etnaviv_cmdbuf.h"
#include "etnaviv_drv.h"
#include "etnaviv_gem.h"
#include "etnaviv_gpu.h"
#include "etnaviv_mmu.h"
static void etnaviv_context_unmap(struct etnaviv_iommu_context *context,
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%zx\n",
iova, size, pgsize);
return;
}
while (unmapped < size) {
unmapped_page = context->global->ops->unmap(context, iova,
pgsize);
if (!unmapped_page)
break;
iova += unmapped_page;
unmapped += unmapped_page;
}
}
static int etnaviv_context_map(struct etnaviv_iommu_context *context,
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%zx\n",
iova, &paddr, size, pgsize);
return -EINVAL;
}
while (size) {
ret = context->global->ops->map(context, iova, paddr, pgsize,
prot);
if (ret)
break;
iova += pgsize;
paddr += pgsize;
size -= pgsize;
}
/* unroll mapping in case something went wrong */
if (ret)
etnaviv_context_unmap(context, orig_iova, orig_size - size);
return ret;
}
static int etnaviv_iommu_map(struct etnaviv_iommu_context *context, u32 iova,
struct sg_table *sgt, unsigned len, int prot)
{ struct scatterlist *sg;
unsigned int da = iova;
unsigned int i;
int ret;
if (!context || !sgt)
return -EINVAL;
for_each_sgtable_dma_sg(sgt, sg, 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_context_map(context, da, pa, bytes, prot);
if (ret)
goto fail;
da += bytes;
}
return 0;
fail:
etnaviv_context_unmap(context, iova, da - iova);
return ret;
}
static void etnaviv_iommu_unmap(struct etnaviv_iommu_context *context, u32 iova,
struct sg_table *sgt, unsigned len)
{
struct scatterlist *sg;
unsigned int da = iova;
int i;
for_each_sgtable_dma_sg(sgt, sg, i) {
size_t bytes = sg_dma_len(sg) + sg->offset;
etnaviv_context_unmap(context, 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_context *context,
struct etnaviv_vram_mapping *mapping)
{
struct etnaviv_gem_object *etnaviv_obj = mapping->object;
etnaviv_iommu_unmap(context, 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_context *context,
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(&context->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(&context->mm, node,
size, 0, 0, 0, U64_MAX, mode);
if (ret != -ENOSPC)
break;
/* Try to retire some entries */
drm_mm_scan_init(&scan, &context->mm, size, 0, 0, mode);
found = 0;
INIT_LIST_HEAD(&list);
list_for_each_entry(free, &context->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(context, m);
m->context = 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;
}
static int etnaviv_iommu_insert_exact(struct etnaviv_iommu_context *context,
struct drm_mm_node *node, size_t size, u64 va)
{
return drm_mm_insert_node_in_range(&context->mm, node, size, 0, 0, va,
va + size, DRM_MM_INSERT_LOWEST);
}
int etnaviv_iommu_map_gem(struct etnaviv_iommu_context *context,
struct etnaviv_gem_object *etnaviv_obj, u32 memory_base,
struct etnaviv_vram_mapping *mapping, u64 va)
{
struct sg_table *sgt = etnaviv_obj->sgt;
struct drm_mm_node *node;
int ret;
lockdep_assert_held(&etnaviv_obj->lock);
mutex_lock(&context->lock);
/* v1 MMU can optimize single entry (contiguous) scatterlists */
if (context->global->version == ETNAVIV_IOMMU_V1 &&
sgt->nents == 1 && !(
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