Release 4.11 drivers/gpu/drm/vc4/vc4_bo.c
/*
* Copyright © 2015 Broadcom
*
* 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.
*/
/* DOC: VC4 GEM BO management support.
*
* The VC4 GPU architecture (both scanout and rendering) has direct
* access to system memory with no MMU in between. To support it, we
* use the GEM CMA helper functions to allocate contiguous ranges of
* physical memory for our BOs.
*
* Since the CMA allocator is very slow, we keep a cache of recently
* freed BOs around so that the kernel's allocation of objects for 3D
* rendering can return quickly.
*/
#include "vc4_drv.h"
#include "uapi/drm/vc4_drm.h"
static void vc4_bo_stats_dump(struct vc4_dev *vc4)
{
DRM_INFO("num bos allocated: %d\n",
vc4->bo_stats.num_allocated);
DRM_INFO("size bos allocated: %dkb\n",
vc4->bo_stats.size_allocated / 1024);
DRM_INFO("num bos used: %d\n",
vc4->bo_stats.num_allocated - vc4->bo_stats.num_cached);
DRM_INFO("size bos used: %dkb\n",
(vc4->bo_stats.size_allocated -
vc4->bo_stats.size_cached) / 1024);
DRM_INFO("num bos cached: %d\n",
vc4->bo_stats.num_cached);
DRM_INFO("size bos cached: %dkb\n",
vc4->bo_stats.size_cached / 1024);
}
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#ifdef CONFIG_DEBUG_FS
int vc4_bo_stats_debugfs(struct seq_file *m, void *unused)
{
struct drm_info_node *node = (struct drm_info_node *)m->private;
struct drm_device *dev = node->minor->dev;
struct vc4_dev *vc4 = to_vc4_dev(dev);
struct vc4_bo_stats stats;
/* Take a snapshot of the current stats with the lock held. */
mutex_lock(&vc4->bo_lock);
stats = vc4->bo_stats;
mutex_unlock(&vc4->bo_lock);
seq_printf(m, "num bos allocated: %d\n",
stats.num_allocated);
seq_printf(m, "size bos allocated: %dkb\n",
stats.size_allocated / 1024);
seq_printf(m, "num bos used: %d\n",
stats.num_allocated - stats.num_cached);
seq_printf(m, "size bos used: %dkb\n",
(stats.size_allocated - stats.size_cached) / 1024);
seq_printf(m, "num bos cached: %d\n",
stats.num_cached);
seq_printf(m, "size bos cached: %dkb\n",
stats.size_cached / 1024);
return 0;
}
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#endif
static uint32_t bo_page_index(size_t size)
{
return (size / PAGE_SIZE) - 1;
}
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/* Must be called with bo_lock held. */
static void vc4_bo_destroy(struct vc4_bo *bo)
{
struct drm_gem_object *obj = &bo->base.base;
struct vc4_dev *vc4 = to_vc4_dev(obj->dev);
if (bo->validated_shader) {
kfree(bo->validated_shader->texture_samples);
kfree(bo->validated_shader);
bo->validated_shader = NULL;
}
vc4->bo_stats.num_allocated--;
vc4->bo_stats.size_allocated -= obj->size;
drm_gem_cma_free_object(obj);
}
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/* Must be called with bo_lock held. */
static void vc4_bo_remove_from_cache(struct vc4_bo *bo)
{
struct drm_gem_object *obj = &bo->base.base;
struct vc4_dev *vc4 = to_vc4_dev(obj->dev);
vc4->bo_stats.num_cached--;
vc4->bo_stats.size_cached -= obj->size;
list_del(&bo->unref_head);
list_del(&bo->size_head);
}
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static struct list_head *vc4_get_cache_list_for_size(struct drm_device *dev,
size_t size)
{
struct vc4_dev *vc4 = to_vc4_dev(dev);
uint32_t page_index = bo_page_index(size);
if (vc4->bo_cache.size_list_size <= page_index) {
uint32_t new_size = max(vc4->bo_cache.size_list_size * 2,
page_index + 1);
struct list_head *new_list;
uint32_t i;
new_list = kmalloc_array(new_size, sizeof(struct list_head),
GFP_KERNEL);
if (!new_list)
return NULL;
/* Rebase the old cached BO lists to their new list
* head locations.
*/
for (i = 0; i < vc4->bo_cache.size_list_size; i++) {
struct list_head *old_list =
&vc4->bo_cache.size_list[i];
if (list_empty(old_list))
INIT_LIST_HEAD(&new_list[i]);
else
list_replace(old_list, &new_list[i]);
}
/* And initialize the brand new BO list heads. */
for (i = vc4->bo_cache.size_list_size; i < new_size; i++)
INIT_LIST_HEAD(&new_list[i]);
kfree(vc4->bo_cache.size_list);
vc4->bo_cache.size_list = new_list;
vc4->bo_cache.size_list_size = new_size;
}
return &vc4->bo_cache.size_list[page_index];
}
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| Eric Anholt | 221 | 100.00% | 2 | 100.00% |
| Total | 221 | 100.00% | 2 | 100.00% |
static void vc4_bo_cache_purge(struct drm_device *dev)
{
struct vc4_dev *vc4 = to_vc4_dev(dev);
mutex_lock(&vc4->bo_lock);
while (!list_empty(&vc4->bo_cache.time_list)) {
struct vc4_bo *bo = list_last_entry(&vc4->bo_cache.time_list,
struct vc4_bo, unref_head);
vc4_bo_remove_from_cache(bo);
vc4_bo_destroy(bo);
}
mutex_unlock(&vc4->bo_lock);
}
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| Total | 82 | 100.00% | 2 | 100.00% |
static struct vc4_bo *vc4_bo_get_from_cache(struct drm_device *dev,
uint32_t size)
{
struct vc4_dev *vc4 = to_vc4_dev(dev);
uint32_t page_index = bo_page_index(size);
struct vc4_bo *bo = NULL;
size = roundup(size, PAGE_SIZE);
mutex_lock(&vc4->bo_lock);
if (page_index >= vc4->bo_cache.size_list_size)
goto out;
if (list_empty(&vc4->bo_cache.size_list[page_index]))
goto out;
bo = list_first_entry(&vc4->bo_cache.size_list[page_index],
struct vc4_bo, size_head);
vc4_bo_remove_from_cache(bo);
kref_init(&bo->base.base.refcount);
out:
mutex_unlock(&vc4->bo_lock);
return bo;
}
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| Eric Anholt | 139 | 100.00% | 1 | 100.00% |
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/**
* vc4_gem_create_object - Implementation of driver->gem_create_object.
*
* This lets the CMA helpers allocate object structs for us, and keep
* our BO stats correct.
*/
struct drm_gem_object *vc4_create_object(struct drm_device *dev, size_t size)
{
struct vc4_dev *vc4 = to_vc4_dev(dev);
struct vc4_bo *bo;
bo = kzalloc(sizeof(*bo), GFP_KERNEL);
if (!bo)
return ERR_PTR(-ENOMEM);
mutex_lock(&vc4->bo_lock);
vc4->bo_stats.num_allocated++;
vc4->bo_stats.size_allocated += size;
mutex_unlock(&vc4->bo_lock);
return &bo->base.base;
}
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| Total | 94 | 100.00% | 1 | 100.00% |
struct vc4_bo *vc4_bo_create(struct drm_device *dev, size_t unaligned_size,
bool from_cache)
{
size_t size = roundup(unaligned_size, PAGE_SIZE);
struct vc4_dev *vc4 = to_vc4_dev(dev);
struct drm_gem_cma_object *cma_obj;
if (size == 0)
return ERR_PTR(-EINVAL);
/* First, try to get a vc4_bo from the kernel BO cache. */
if (from_cache) {
struct vc4_bo *bo = vc4_bo_get_from_cache(dev, size);
if (bo)
return bo;
}
cma_obj = drm_gem_cma_create(dev, size);
if (IS_ERR(cma_obj)) {
/*
* If we've run out of CMA memory, kill the cache of
* CMA allocations we've got laying around and try again.
*/
vc4_bo_cache_purge(dev);
cma_obj = drm_gem_cma_create(dev, size);
if (IS_ERR(cma_obj)) {
DRM_ERROR("Failed to allocate from CMA:\n");
vc4_bo_stats_dump(vc4);
return ERR_PTR(-ENOMEM);
}
}
return to_vc4_bo(&cma_obj->base);
}
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int vc4_dumb_create(struct drm_file *file_priv,
struct drm_device *dev,
struct drm_mode_create_dumb *args)
{
int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
struct vc4_bo *bo = NULL;
int ret;
if (args->pitch < min_pitch)
args->pitch = min_pitch;
if (args->size < args->pitch * args->height)
args->size = args->pitch * args->height;
bo = vc4_bo_create(dev, args->size, false);
if (IS_ERR(bo))
return PTR_ERR(bo);
ret = drm_gem_handle_create(file_priv, &bo->base.base, &args->handle);
drm_gem_object_unreference_unlocked(&bo->base.base);
return ret;
}
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| Total | 144 | 100.00% | 2 | 100.00% |
/* Must be called with bo_lock held. */
static void vc4_bo_cache_free_old(struct drm_device *dev)
{
struct vc4_dev *vc4 = to_vc4_dev(dev);
unsigned long expire_time = jiffies - msecs_to_jiffies(1000);
while (!list_empty(&vc4->bo_cache.time_list)) {
struct vc4_bo *bo = list_last_entry(&vc4->bo_cache.time_list,
struct vc4_bo, unref_head);
if (time_before(expire_time, bo->free_time)) {
mod_timer(&vc4->bo_cache.time_timer,
round_jiffies_up(jiffies +
msecs_to_jiffies(1000)));
return;
}
vc4_bo_remove_from_cache(bo);
vc4_bo_destroy(bo);
}
}
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| Eric Anholt | 111 | 100.00% | 1 | 100.00% |
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/* Called on the last userspace/kernel unreference of the BO. Returns
* it to the BO cache if possible, otherwise frees it.
*/
void vc4_free_object(struct drm_gem_object *gem_bo)
{
struct drm_device *dev = gem_bo->dev;
struct vc4_dev *vc4 = to_vc4_dev(dev);
struct vc4_bo *bo = to_vc4_bo(gem_bo);
struct list_head *cache_list;
mutex_lock(&vc4->bo_lock);
/* If the object references someone else's memory, we can't cache it.
*/
if (gem_bo->import_attach) {
vc4_bo_destroy(bo);
goto out;
}
/* Don't cache if it was publicly named. */
if (gem_bo->name) {
vc4_bo_destroy(bo);
goto out;
}
cache_list = vc4_get_cache_list_for_size(dev, gem_bo->size);
if (!cache_list) {
vc4_bo_destroy(bo);
goto out;
}
if (bo->validated_shader) {
kfree(bo->validated_shader->texture_samples);
kfree(bo->validated_shader);
bo->validated_shader = NULL;
}
bo->free_time = jiffies;
list_add(&bo->size_head, cache_list);
list_add(&bo->unref_head, &vc4->bo_cache.time_list);
vc4->bo_stats.num_cached++;
vc4->bo_stats.size_cached += gem_bo->size;
vc4_bo_cache_free_old(dev);
out:
mutex_unlock(&vc4->bo_lock);
}
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| Eric Anholt | 205 | 100.00% | 2 | 100.00% |
| Total | 205 | 100.00% | 2 | 100.00% |
static void vc4_bo_cache_time_work(struct work_struct *work)
{
struct vc4_dev *vc4 =
container_of(work, struct vc4_dev, bo_cache.time_work);
struct drm_device *dev = vc4->dev;
mutex_lock(&vc4->bo_lock);
vc4_bo_cache_free_old(dev);
mutex_unlock(&vc4->bo_lock);
}
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static void vc4_bo_cache_time_timer(unsigned long data)
{
struct drm_device *dev = (struct drm_device *)data;
struct vc4_dev *vc4 = to_vc4_dev(dev);
schedule_work(&vc4->bo_cache.time_work);
}
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| Eric Anholt | 42 | 100.00% | 1 | 100.00% |
| Total | 42 | 100.00% | 1 | 100.00% |
struct dma_buf *
vc4_prime_export(struct drm_device *dev, struct drm_gem_object *obj, int flags)
{
struct vc4_bo *bo = to_vc4_bo(obj);
if (bo->validated_shader) {
DRM_ERROR("Attempting to export shader BO\n");
return ERR_PTR(-EINVAL);
}
return drm_gem_prime_export(dev, obj, flags);
}
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| Eric Anholt | 60 | 100.00% | 2 | 100.00% |
| Total | 60 | 100.00% | 2 | 100.00% |
int vc4_mmap(struct file *filp, struct vm_area_struct *vma)
{
struct drm_gem_object *gem_obj;
struct vc4_bo *bo;
int ret;
ret = drm_gem_mmap(filp, vma);
if (ret)
return ret;
gem_obj = vma->vm_private_data;
bo = to_vc4_bo(gem_obj);
if (bo->validated_shader && (vma->vm_flags & VM_WRITE)) {
DRM_ERROR("mmaping of shader BOs for writing not allowed.\n");
return -EINVAL;
}
/*
* Clear the VM_PFNMAP flag that was set by drm_gem_mmap(), and set the
* vm_pgoff (used as a fake buffer offset by DRM) to 0 as we want to map
* the whole buffer.
*/
vma->vm_flags &= ~VM_PFNMAP;
vma->vm_pgoff = 0;
ret = dma_mmap_wc(bo->base.base.dev->dev, vma, bo->base.vaddr,
bo->base.paddr, vma->vm_end - vma->vm_start);
if (ret)
drm_gem_vm_close(vma);
return ret;
}
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| Total | 145 | 100.00% | 3 | 100.00% |
int vc4_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
{
struct vc4_bo *bo = to_vc4_bo(obj);
if (bo->validated_shader && (vma->vm_flags & VM_WRITE)) {
DRM_ERROR("mmaping of shader BOs for writing not allowed.\n");
return -EINVAL;
}
return drm_gem_cma_prime_mmap(obj, vma);
}
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| Eric Anholt | 58 | 100.00% | 2 | 100.00% |
| Total | 58 | 100.00% | 2 | 100.00% |
void *vc4_prime_vmap(struct drm_gem_object *obj)
{
struct vc4_bo *bo = to_vc4_bo(obj);
if (bo->validated_shader) {
DRM_ERROR("mmaping of shader BOs not allowed.\n");
return ERR_PTR(-EINVAL);
}
return drm_gem_cma_prime_vmap(obj);
}
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| Eric Anholt | 47 | 100.00% | 1 | 100.00% |
| Total | 47 | 100.00% | 1 | 100.00% |
int vc4_create_bo_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_vc4_create_bo *args = data;
struct vc4_bo *bo = NULL;
int ret;
/*
* We can't allocate from the BO cache, because the BOs don't
* get zeroed, and that might leak data between users.
*/
bo = vc4_bo_create(dev, args->size, false);
if (IS_ERR(bo))
return PTR_ERR(bo);
ret = drm_gem_handle_create(file_priv, &bo->base.base, &args->handle);
drm_gem_object_unreference_unlocked(&bo->base.base);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Eric Anholt | 95 | 100.00% | 2 | 100.00% |
| Total | 95 | 100.00% | 2 | 100.00% |
int vc4_mmap_bo_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_vc4_mmap_bo *args = data;
struct drm_gem_object *gem_obj;
gem_obj = drm_gem_object_lookup(file_priv, args->handle);
if (!gem_obj) {
DRM_ERROR("Failed to look up GEM BO %d\n", args->handle);
return -EINVAL;
}
/* The mmap offset was set up at BO allocation time. */
args->offset = drm_vma_node_offset_addr(&gem_obj->vma_node);
drm_gem_object_unreference_unlocked(gem_obj);
return 0;
}
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| Eric Anholt | 83 | 100.00% | 2 | 100.00% |
| Total | 83 | 100.00% | 2 | 100.00% |
int
vc4_create_shader_bo_ioctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_vc4_create_shader_bo *args = data;
struct vc4_bo *bo = NULL;
int ret;
if (args->size == 0)
return -EINVAL;
if (args->size % sizeof(u64) != 0)
return -EINVAL;
if (args->flags != 0) {
DRM_INFO("Unknown flags set: 0x%08x\n", args->flags);
return -EINVAL;
}
if (args->pad != 0) {
DRM_INFO("Pad set: 0x%08x\n", args->pad);
return -EINVAL;
}
bo = vc4_bo_create(dev, args->size, true);
if (IS_ERR(bo))
return PTR_ERR(bo);
if (copy_from_user(bo->base.vaddr,
(void __user *)(uintptr_t)args->data,
args->size)) {
ret = -EFAULT;
goto fail;
}
/* Clear the rest of the memory from allocating from the BO
* cache.
*/
memset(bo->base.vaddr + args->size, 0,
bo->base.base.size - args->size);
bo->validated_shader = vc4_validate_shader(&bo->base);
if (!bo->validated_shader) {
ret = -EINVAL;
goto fail;
}
/* We have to create the handle after validation, to avoid
* races for users to do doing things like mmap the shader BO.
*/
ret = drm_gem_handle_create(file_priv, &bo->base.base, &args->handle);
fail:
drm_gem_object_unreference_unlocked(&bo->base.base);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Eric Anholt | 257 | 96.62% | 2 | 66.67% |
| Dan Carpenter | 9 | 3.38% | 1 | 33.33% |
| Total | 266 | 100.00% | 3 | 100.00% |
void vc4_bo_cache_init(struct drm_device *dev)
{
struct vc4_dev *vc4 = to_vc4_dev(dev);
mutex_init(&vc4->bo_lock);
INIT_LIST_HEAD(&vc4->bo_cache.time_list);
INIT_WORK(&vc4->bo_cache.time_work, vc4_bo_cache_time_work);
setup_timer(&vc4->bo_cache.time_timer,
vc4_bo_cache_time_timer,
(unsigned long)dev);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Eric Anholt | 68 | 100.00% | 1 | 100.00% |
| Total | 68 | 100.00% | 1 | 100.00% |
void vc4_bo_cache_destroy(struct drm_device *dev)
{
struct vc4_dev *vc4 = to_vc4_dev(dev);
del_timer(&vc4->bo_cache.time_timer);
cancel_work_sync(&vc4->bo_cache.time_work);
vc4_bo_cache_purge(dev);
if (vc4->bo_stats.num_allocated) {
DRM_ERROR("Destroying BO cache while BOs still allocated:\n");
vc4_bo_stats_dump(vc4);
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Eric Anholt | 65 | 100.00% | 1 | 100.00% |
| Total | 65 | 100.00% | 1 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Eric Anholt | 2570 | 99.54% | 5 | 55.56% |
| Dan Carpenter | 9 | 0.35% | 1 | 11.11% |
| Luis R. Rodriguez | 1 | 0.04% | 1 | 11.11% |
| Baoyou Xie | 1 | 0.04% | 1 | 11.11% |
| Daniel Vetter | 1 | 0.04% | 1 | 11.11% |
| Total | 2582 | 100.00% | 9 | 100.00% |
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