mirror of https://gitee.com/openkylin/linux.git
96 lines
2.3 KiB
C
96 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright 2019 Linaro, Ltd, Rob Herring <robh@kernel.org> */
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/dma-buf.h>
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#include <linux/dma-mapping.h>
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#include <drm/panfrost_drm.h>
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#include "panfrost_device.h"
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#include "panfrost_gem.h"
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#include "panfrost_mmu.h"
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/* Called DRM core on the last userspace/kernel unreference of the
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* BO.
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*/
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static void panfrost_gem_free_object(struct drm_gem_object *obj)
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{
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struct panfrost_gem_object *bo = to_panfrost_bo(obj);
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struct panfrost_device *pfdev = obj->dev->dev_private;
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panfrost_mmu_unmap(bo);
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spin_lock(&pfdev->mm_lock);
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drm_mm_remove_node(&bo->node);
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spin_unlock(&pfdev->mm_lock);
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drm_gem_shmem_free_object(obj);
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}
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static const struct drm_gem_object_funcs panfrost_gem_funcs = {
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.free = panfrost_gem_free_object,
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.print_info = drm_gem_shmem_print_info,
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.pin = drm_gem_shmem_pin,
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.unpin = drm_gem_shmem_unpin,
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.get_sg_table = drm_gem_shmem_get_sg_table,
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.vmap = drm_gem_shmem_vmap,
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.vunmap = drm_gem_shmem_vunmap,
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.vm_ops = &drm_gem_shmem_vm_ops,
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};
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/**
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* panfrost_gem_create_object - Implementation of driver->gem_create_object.
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* @dev: DRM device
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* @size: Size in bytes of the memory the object will reference
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*
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* This lets the GEM helpers allocate object structs for us, and keep
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* our BO stats correct.
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*/
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struct drm_gem_object *panfrost_gem_create_object(struct drm_device *dev, size_t size)
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{
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int ret;
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struct panfrost_device *pfdev = dev->dev_private;
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struct panfrost_gem_object *obj;
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obj = kzalloc(sizeof(*obj), GFP_KERNEL);
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if (!obj)
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return NULL;
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obj->base.base.funcs = &panfrost_gem_funcs;
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spin_lock(&pfdev->mm_lock);
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ret = drm_mm_insert_node(&pfdev->mm, &obj->node,
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roundup(size, PAGE_SIZE) >> PAGE_SHIFT);
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spin_unlock(&pfdev->mm_lock);
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if (ret)
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goto free_obj;
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return &obj->base.base;
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free_obj:
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kfree(obj);
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return ERR_PTR(ret);
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}
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struct drm_gem_object *
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panfrost_gem_prime_import_sg_table(struct drm_device *dev,
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struct dma_buf_attachment *attach,
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struct sg_table *sgt)
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{
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struct drm_gem_object *obj;
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struct panfrost_gem_object *pobj;
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obj = drm_gem_shmem_prime_import_sg_table(dev, attach, sgt);
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if (IS_ERR(obj))
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return ERR_CAST(obj);
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pobj = to_panfrost_bo(obj);
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obj->resv = attach->dmabuf->resv;
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panfrost_mmu_map(pobj);
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return obj;
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}
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