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// SPDX-License-Identifier: GPL-2.0
/* Copyright 2019 Linaro, Ltd, Rob Herring <robh@kernel.org> */
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/dma-buf.h>
#include <linux/dma-mapping.h>
#include <drm/panfrost_drm.h>
#include "panfrost_device.h"
#include "panfrost_gem.h"
#include "panfrost_mmu.h"
/* Called DRM core on the last userspace/kernel unreference of the
* BO.
*/
static void panfrost_gem_free_object(struct drm_gem_object *obj)
{
struct panfrost_gem_object *bo = to_panfrost_bo(obj);
struct panfrost_device *pfdev = obj->dev->dev_private;
/*
* Make sure the BO is no longer inserted in the shrinker list before
* taking care of the destruction itself. If we don't do that we have a
* race condition between this function and what's done in
* panfrost_gem_shrinker_scan().
*/
mutex_lock(&pfdev->shrinker_lock);
list_del_init(&bo->base.madv_list);
mutex_unlock(&pfdev->shrinker_lock);
if (bo->sgts) {
int i;
int n_sgt = bo->base.base.size / SZ_2M;
for (i = 0; i < n_sgt; i++) {
if (bo->sgts[i].sgl) {
dma_unmap_sg(pfdev->dev, bo->sgts[i].sgl,
bo->sgts[i].nents, DMA_BIDIRECTIONAL);
sg_free_table(&bo->sgts[i]);
}
}
kfree(bo->sgts);
}
drm_gem_shmem_free_object(obj);
}
int panfrost_gem_open(struct drm_gem_object *obj, struct drm_file *file_priv)
{
int ret;
size_t size = obj->size;
u64 align;
struct panfrost_gem_object *bo = to_panfrost_bo(obj);
unsigned long color = bo->noexec ? PANFROST_BO_NOEXEC : 0;
struct panfrost_file_priv *priv = file_priv->driver_priv;
/*
* Executable buffers cannot cross a 16MB boundary as the program
* counter is 24-bits. We assume executable buffers will be less than
* 16MB and aligning executable buffers to their size will avoid
* crossing a 16MB boundary.
*/
if (!bo->noexec)
align = size >> PAGE_SHIFT;
else
align = size >= SZ_2M ? SZ_2M >> PAGE_SHIFT : 0;
bo->mmu = &priv->mmu;
spin_lock(&priv->mm_lock);
ret = drm_mm_insert_node_generic(&priv->mm, &bo->node,
size >> PAGE_SHIFT, align, color, 0);
spin_unlock(&priv->mm_lock);
if (ret)
return ret;
if (!bo->is_heap) {
ret = panfrost_mmu_map(bo);
if (ret) {
spin_lock(&priv->mm_lock);
drm_mm_remove_node(&bo->node);
spin_unlock(&priv->mm_lock);
}
}
return ret;
}
void panfrost_gem_close(struct drm_gem_object *obj, struct drm_file *file_priv)
{
struct panfrost_gem_object *bo = to_panfrost_bo(obj);
struct panfrost_file_priv *priv = file_priv->driver_priv;
if (bo->is_mapped)
panfrost_mmu_unmap(bo);
spin_lock(&priv->mm_lock);
if (drm_mm_node_allocated(&bo->node))
drm_mm_remove_node(&bo->node);
spin_unlock(&priv->mm_lock);
}
static int panfrost_gem_pin(struct drm_gem_object *obj)
{
if (to_panfrost_bo(obj)->is_heap)
return -EINVAL;
return drm_gem_shmem_pin(obj);
}
static const struct drm_gem_object_funcs panfrost_gem_funcs = {
.free = panfrost_gem_free_object,
.open = panfrost_gem_open,
.close = panfrost_gem_close,
.print_info = drm_gem_shmem_print_info,
.pin = panfrost_gem_pin,
.unpin = drm_gem_shmem_unpin,
.get_sg_table = drm_gem_shmem_get_sg_table,
.vmap = drm_gem_shmem_vmap,
.vunmap = drm_gem_shmem_vunmap,
.mmap = drm_gem_shmem_mmap,
};
/**
* panfrost_gem_create_object - Implementation of driver->gem_create_object.
* @dev: DRM device
* @size: Size in bytes of the memory the object will reference
*
* This lets the GEM helpers allocate object structs for us, and keep
* our BO stats correct.
*/
struct drm_gem_object *panfrost_gem_create_object(struct drm_device *dev, size_t size)
{
struct panfrost_gem_object *obj;
obj = kzalloc(sizeof(*obj), GFP_KERNEL);
if (!obj)
return NULL;
obj->base.base.funcs = &panfrost_gem_funcs;
return &obj->base.base;
}
struct panfrost_gem_object *
panfrost_gem_create_with_handle(struct drm_file *file_priv,
struct drm_device *dev, size_t size,
u32 flags,
uint32_t *handle)
{
int ret;
struct drm_gem_shmem_object *shmem;
struct panfrost_gem_object *bo;
/* Round up heap allocations to 2MB to keep fault handling simple */
if (flags & PANFROST_BO_HEAP)
size = roundup(size, SZ_2M);
shmem = drm_gem_shmem_create(dev, size);
if (IS_ERR(shmem))
return ERR_CAST(shmem);
bo = to_panfrost_bo(&shmem->base);
bo->noexec = !!(flags & PANFROST_BO_NOEXEC);
bo->is_heap = !!(flags & PANFROST_BO_HEAP);
/*
* Allocate an id of idr table where the obj is registered
* and handle has the id what user can see.
*/
ret = drm_gem_handle_create(file_priv, &shmem->base, handle);
/* drop reference from allocate - handle holds it now. */
drm_gem_object_put_unlocked(&shmem->base);
if (ret)
return ERR_PTR(ret);
return bo;
}
struct drm_gem_object *
panfrost_gem_prime_import_sg_table(struct drm_device *dev,
struct dma_buf_attachment *attach,
struct sg_table *sgt)
{
struct drm_gem_object *obj;
struct panfrost_gem_object *bo;
obj = drm_gem_shmem_prime_import_sg_table(dev, attach, sgt);
if (IS_ERR(obj))
return ERR_CAST(obj);
bo = to_panfrost_bo(obj);
bo->noexec = true;
return obj;
}
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