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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;
if (bo->is_mapped)
panfrost_mmu_unmap(bo);
spin_lock(&pfdev->mm_lock);
drm_mm_remove_node(&bo->node);
spin_unlock(&pfdev->mm_lock);
drm_gem_shmem_free_object(obj);
}
static const struct drm_gem_object_funcs panfrost_gem_funcs = {
.free = panfrost_gem_free_object,
.print_info = drm_gem_shmem_print_info,
.pin = drm_gem_shmem_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,
.vm_ops = &drm_gem_shmem_vm_ops,
};
/**
* 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)
{
int ret;
struct panfrost_device *pfdev = dev->dev_private;
struct panfrost_gem_object *obj;
u64 align;
obj = kzalloc(sizeof(*obj), GFP_KERNEL);
if (!obj)
return NULL;
obj->base.base.funcs = &panfrost_gem_funcs;
size = roundup(size, PAGE_SIZE);
align = size >= SZ_2M ? SZ_2M >> PAGE_SHIFT : 0;
spin_lock(&pfdev->mm_lock);
ret = drm_mm_insert_node_generic(&pfdev->mm, &obj->node,
size >> PAGE_SHIFT, align, 0, 0);
spin_unlock(&pfdev->mm_lock);
if (ret)
goto free_obj;
return &obj->base.base;
free_obj:
kfree(obj);
return ERR_PTR(ret);
}
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 *pobj;
obj = drm_gem_shmem_prime_import_sg_table(dev, attach, sgt);
if (IS_ERR(obj))
return ERR_CAST(obj);
pobj = to_panfrost_bo(obj);
obj->resv = attach->dmabuf->resv;
panfrost_mmu_map(pobj);
return obj;
}
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