// 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, 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) {
phys_addr_t pa = sg_dma_address(sg) - sg->offset;
size_t bytes = sg_dma_len(sg) + sg->offset;
VERB("map[%d]: %08x %pap(%zx)", i, iova, &pa, bytes);
ret = etnaviv_context_map(context, da, pa, bytes, prot);
if (ret)
goto fail;
da += bytes;
}
context->flush_seq++;
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;
}
context->flush_seq++;
}
static void etnaviv_iommu_remove_mapping(struct etnaviv_iommu_context *context,
struct etnaviv_vram_mapping *mapping)
{
struct etnaviv_gem_object *etnaviv_obj = mapping->object;
lockdep_assert_held(&context->lock);
etnaviv_iommu_unmap(context, mapping->vram_node.start,
etnaviv_obj->sgt, etnaviv_obj->base.size);
drm_mm_remove_node(&mapping->vram_node);
}
void etnaviv_iommu_reap_mapping(struct etnaviv_vram_mapping *mapping)
{
struct etnaviv_iommu_context *context = mapping->context;
lockdep_assert_held(&context->lock);
WARN_ON(mapping->use);
etnaviv_iommu_remove_mapping(context, mapping);
etnaviv_iommu_context_put(mapping->context);
mapping->context = NULL;
list_del_init(&mapping->mmu_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_reap_mapping(m);
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)
{
struct etnaviv_vram_mapping *m, *n;
struct drm_mm_node *scan_node;
LIST_HEAD(scan_list);
int ret;
lockdep_assert_held(&context->lock);
ret = drm_mm_insert_node_in_range(&context->mm, node, size, 0, 0, va,
va + size, DRM_MM_INSERT_LOWEST);
if (ret != -ENOSPC)
return ret;
/*
* When we can't insert the node, due to a existing mapping blocking
* the address space, there are two possible reasons:
* 1. Userspace genuinely messed up and tried to reuse address space
* before the last job using this VMA has finished executing.
* 2. The existing buffer mappings are idle, but the buffers are not
* destroyed yet (likely due to being referenced by another context) in
* which case the mappings will not be cleaned up and we must reap them
* here to make space for the new mapping.
*/
drm_mm_for_each_node_in_range(scan_node, &context->mm, va, va + size) {
m = container_of(scan_node, struct etnaviv_vram_mapping,
vram_node);
if (m->use)
return -ENOSPC;
list_add(&m->scan_node, &scan_list);
}
list_for_each_entry_safe(m, n, &scan_list, scan_node) {
etnaviv_iommu_reap_mapping(m);
list_del_init(&m->scan_node);
}
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 && !(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;
mapping->context = etnaviv_iommu_context_get(context);
list_add_tail(&mapping->mmu_node, &context->mappings);
ret = 0;
goto unlock;
}
}
node = &mapping->vram_node;
if (va)
ret = etnaviv_iommu_insert_exact(context, node,
etnaviv_obj->base.size, va);
else
ret = etnaviv_iommu_find_iova(context, node,
etnaviv_obj->base.size);
if (ret < 0)
goto unlock;
mapping->iova = node->start;
ret = etnaviv_iommu_map(context, node->start, sgt,
ETNAVIV_PROT_READ | ETNAVIV_PROT_WRITE);
if (ret < 0) {
drm_mm_remove_node(node);
goto unlock;
}
mapping->context = etnaviv_iommu_context_get(context);
list_add_tail(&mapping->mmu_node, &context->mappings);
unlock:
mutex_unlock(&context->lock);
return ret;
}
void etnaviv_iommu_unmap_gem(struct etnaviv_iommu_context *context,
struct etnaviv_vram_mapping *mapping)
{
WARN_ON(mapping->use);
mutex_lock(&context->lock);
/* Bail if the mapping has been reaped by another thread */
if (!mapping->context) {
mutex_unlock(&context->lock);
return;
}
/* If the vram node is on the mm, unmap and remove the node */
if (mapping->vram_node.mm == &context->mm)
etnaviv_iommu_remove_mapping(context, mapping);
list_del(&mapping->mmu_node);
mutex_unlock(&context->lock);
etnaviv_iommu_context_put(context);
}
static void etnaviv_iommu_context_free(struct kref *kref)
{
struct etnaviv_iommu_context *context =
container_of(kref, struct etnaviv_iommu_context, refcount);
etnaviv_cmdbuf_suballoc_unmap(context, &context->cmdbuf_mapping);
context->global->ops->free(context);
}
void etnaviv_iommu_context_put(struct etnaviv_iommu_context *context)
{
kref_put(&context->refcount, etnaviv_iommu_context_free);
}
struct etnaviv_iommu_context *
etnaviv_iommu_context_init(struct etnaviv_iommu_global *global,
struct etnaviv_cmdbuf_suballoc *suballoc)
{
struct etnaviv_iommu_context *ctx;
int ret;
if (global->version == ETNAVIV_IOMMU_V1)
ctx = etnaviv_iommuv1_context_alloc(global);
else
ctx = etnaviv_iommuv2_context_alloc(global);
if (!ctx)
return NULL;
ret = etnaviv_cmdbuf_suballoc_map(suballoc, ctx, &ctx->cmdbuf_mapping,
global->memory_base);
if (ret)
goto out_free;
if (global->version == ETNAVIV_IOMMU_V1 &&
ctx->cmdbuf_mapping.iova > 0x80000000) {
dev_err(global->dev,
"command buffer outside valid memory window\n");
goto out_unmap;
}
return ctx;
out_unmap:
etnaviv_cmdbuf_suballoc_unmap(ctx, &ctx->cmdbuf_mapping);
out_free:
global->ops->free(ctx);
return NULL;
}
void etnaviv_iommu_restore(struct etnaviv_gpu *gpu,
struct etnaviv_iommu_context *context)
{
context->global->ops->restore(gpu, context);
}
int etnaviv_iommu_get_suballoc_va(struct etnaviv_iommu_context *context,
struct etnaviv_vram_mapping *mapping,
u32 memory_base, dma_addr_t paddr,
size_t size)
{
mutex_lock(&context->lock);
if (mapping->use > 0) {
mapping->use++;
mutex_unlock(&context->lock);
return 0;
}
/*
* For MMUv1 we don't add the suballoc region to the pagetables, as
* those GPUs can only work with cmdbufs accessed through the linear
* window. Instead we manufacture a mapping to make it look uniform
* to the upper layers.
*/
if (context->global->version == ETNAVIV_IOMMU_V1) {
mapping->iova = paddr - memory_base;
} else {
struct drm_mm_node *node = &mapping->vram_node;
int ret;
ret = etnaviv_iommu_find_iova(context, node, size);
if (ret < 0) {
mutex_unlock(&context->lock);
return ret;
}
mapping->iova = node->start;
ret = etnaviv_context_map(context, node->start, paddr, size,
ETNAVIV_PROT_READ);
if (ret < 0) {
drm_mm_remove_node(node);
mutex_unlock(&context->lock);
return ret;
}
context->flush_seq++;
}
list_add_tail(&mapping->mmu_node, &context->mappings);
mapping->use = 1;
mutex_unlock(&context->lock);
return 0;
}
void etnaviv_iommu_put_suballoc_va(struct etnaviv_iommu_context *context,
struct etnaviv_vram_mapping *mapping)
{
struct drm_mm_node *node = &mapping->vram_node;
mutex_lock(&context->lock);
mapping->use--;
if (mapping->use > 0 || context->global->version == ETNAVIV_IOMMU_V1) {
mutex_unlock(&context->lock);
return;
}
etnaviv_context_unmap(context, node->start, node->size);
drm_mm_remove_node(node);
mutex_unlock(&context->lock);
}
size_t etnaviv_iommu_dump_size(struct etnaviv_iommu_context *context)
{
return context->global->ops->dump_size(context);
}
void etnaviv_iommu_dump(struct etnaviv_iommu_context *context, void *buf)
{
context->global->ops->dump(context, buf);
}
int etnaviv_iommu_global_init(struct etnaviv_gpu *gpu)
{
enum etnaviv_iommu_version version = ETNAVIV_IOMMU_V1;
struct etnaviv_drm_private *priv = gpu->drm->dev_private;
struct etnaviv_iommu_global *global;
struct device *dev = gpu->drm->dev;
if (gpu->identity.minor_features1 & chipMinorFeatures1_MMU_VERSION)
version = ETNAVIV_IOMMU_V2;
if (priv->mmu_global) {
if (priv->mmu_global->version != version) {
dev_err(gpu->dev,
"MMU version doesn't match global version\n");
return -ENXIO;
}
priv->mmu_global->use++;
return 0;
}
global = kzalloc(sizeof(*global), GFP_KERNEL);
if (!global)
return -ENOMEM;
global->bad_page_cpu = dma_alloc_wc(dev, SZ_4K, &global->bad_page_dma,
GFP_KERNEL);
if (!global->bad_page_cpu)
goto free_global;
memset32(global->bad_page_cpu, 0xdead55aa, SZ_4K / sizeof(u32));
if (version == ETNAVIV_IOMMU_V2) {
global->v2.pta_cpu = dma_alloc_wc(dev, ETNAVIV_PTA_SIZE,
&global->v2.pta_dma, GFP_KERNEL);
if (!global->v2.pta_cpu)
goto free_bad_page;
}
global->dev = dev;
global->version = version;
global->use = 1;
mutex_init(&global->lock);
if (version == ETNAVIV_IOMMU_V1)
global->ops = &etnaviv_iommuv1_ops;
else
global->ops = &etnaviv_iommuv2_ops;
priv->mmu_global = global;
return 0;
free_bad_page:
dma_free_wc(dev, SZ_4K, global->bad_page_cpu, global->bad_page_dma);
free_global:
kfree(global);
return -ENOMEM;
}
void etnaviv_iommu_global_fini(struct etnaviv_gpu *gpu)
{
struct etnaviv_drm_private *priv = gpu->drm->dev_private;
struct etnaviv_iommu_global *global = priv->mmu_global;
if (!global)
return;
if (--global->use > 0)
return;
if (global->v2.pta_cpu)
dma_free_wc(global->dev, ETNAVIV_PTA_SIZE,
global->v2.pta_cpu, global->v2.pta_dma);
if (global->bad_page_cpu)
dma_free_wc(global->dev, SZ_4K,
global->bad_page_cpu, global->bad_page_dma);
mutex_destroy(&global->lock);
kfree(global);
priv->mmu_global = NULL;
}
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