drivers/gpu/drm/panfrost/panfrost_gem.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright 2019 Linaro, Ltd, Rob Herring <robh@kernel.org> */
   3
   4 #include <linux/err.h>
   5 #include <linux/slab.h>
   6 #include <linux/dma-buf.h>
   7 #include <linux/dma-mapping.h>
   8
   9 #include <drm/panfrost_drm.h>
  10 #include "panfrost_device.h"
  11 #include "panfrost_gem.h"
  12 #include "panfrost_mmu.h"
  13
  14 /* Called DRM core on the last userspace/kernel unreference of the
  15  * BO.
  16  */
  17 static void panfrost_gem_free_object(struct drm_gem_object *obj)
  18 {
  19         struct panfrost_gem_object *bo = to_panfrost_bo(obj);
  20         struct panfrost_device *pfdev = obj->dev->dev_private;
  21
  22         if (bo->is_mapped)
  23                 panfrost_mmu_unmap(bo);
  24
  25         spin_lock(&pfdev->mm_lock);
  26         drm_mm_remove_node(&bo->node);
  27         spin_unlock(&pfdev->mm_lock);
  28
  29         drm_gem_shmem_free_object(obj);
  30 }
  31
  32 static const struct drm_gem_object_funcs panfrost_gem_funcs = {
  33         .free = panfrost_gem_free_object,
  34         .print_info = drm_gem_shmem_print_info,
  35         .pin = drm_gem_shmem_pin,
  36         .unpin = drm_gem_shmem_unpin,
  37         .get_sg_table = drm_gem_shmem_get_sg_table,
  38         .vmap = drm_gem_shmem_vmap,
  39         .vunmap = drm_gem_shmem_vunmap,
  40         .vm_ops = &drm_gem_shmem_vm_ops,
  41 };
  42
  43 /**
  44  * panfrost_gem_create_object - Implementation of driver->gem_create_object.
  45  * @dev: DRM device
  46  * @size: Size in bytes of the memory the object will reference
  47  *
  48  * This lets the GEM helpers allocate object structs for us, and keep
  49  * our BO stats correct.
  50  */
  51 struct drm_gem_object *panfrost_gem_create_object(struct drm_device *dev, size_t size)
  52 {
  53         int ret;
  54         struct panfrost_device *pfdev = dev->dev_private;
  55         struct panfrost_gem_object *obj;
  56         u64 align;
  57
  58         obj = kzalloc(sizeof(*obj), GFP_KERNEL);
  59         if (!obj)
  60                 return NULL;
  61
  62         obj->base.base.funcs = &panfrost_gem_funcs;
  63
  64         size = roundup(size, PAGE_SIZE);
  65         align = size >= SZ_2M ? SZ_2M >> PAGE_SHIFT : 0;
  66
  67         spin_lock(&pfdev->mm_lock);
  68         ret = drm_mm_insert_node_generic(&pfdev->mm, &obj->node,
  69                                          size >> PAGE_SHIFT, align, 0, 0);
  70         spin_unlock(&pfdev->mm_lock);
  71         if (ret)
  72                 goto free_obj;
  73
  74         return &obj->base.base;
  75
  76 free_obj:
  77         kfree(obj);
  78         return ERR_PTR(ret);
  79 }
  80
  81 struct drm_gem_object *
  82 panfrost_gem_prime_import_sg_table(struct drm_device *dev,
  83                                    struct dma_buf_attachment *attach,
  84                                    struct sg_table *sgt)
  85 {
  86         struct drm_gem_object *obj;
  87         struct panfrost_gem_object *pobj;
  88
  89         obj = drm_gem_shmem_prime_import_sg_table(dev, attach, sgt);
  90         if (IS_ERR(obj))
  91                 return ERR_CAST(obj);
  92
  93         pobj = to_panfrost_bo(obj);
  94
  95         obj->resv = attach->dmabuf->resv;
  96
  97         panfrost_mmu_map(pobj);
  98
  99         return obj;
 100 }