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 panfrost_mmu_unmap(bo); 23 24 spin_lock(&pfdev->mm_lock); 25 drm_mm_remove_node(&bo->node); 26 spin_unlock(&pfdev->mm_lock); 27 28 drm_gem_shmem_free_object(obj); 29 } 30 31 static const struct drm_gem_object_funcs panfrost_gem_funcs = { 32 .free = panfrost_gem_free_object, 33 .print_info = drm_gem_shmem_print_info, 34 .pin = drm_gem_shmem_pin, 35 .unpin = drm_gem_shmem_unpin, 36 .get_sg_table = drm_gem_shmem_get_sg_table, 37 .vmap = drm_gem_shmem_vmap, 38 .vunmap = drm_gem_shmem_vunmap, 39 .vm_ops = &drm_gem_shmem_vm_ops, 40 }; 41 42 /** 43 * panfrost_gem_create_object - Implementation of driver->gem_create_object. 44 * @dev: DRM device 45 * @size: Size in bytes of the memory the object will reference 46 * 47 * This lets the GEM helpers allocate object structs for us, and keep 48 * our BO stats correct. 49 */ 50 struct drm_gem_object *panfrost_gem_create_object(struct drm_device *dev, size_t size) 51 { 52 int ret; 53 struct panfrost_device *pfdev = dev->dev_private; 54 struct panfrost_gem_object *obj; 55 56 obj = kzalloc(sizeof(*obj), GFP_KERNEL); 57 if (!obj) 58 return NULL; 59 60 obj->base.base.funcs = &panfrost_gem_funcs; 61 62 spin_lock(&pfdev->mm_lock); 63 ret = drm_mm_insert_node(&pfdev->mm, &obj->node, 64 roundup(size, PAGE_SIZE) >> PAGE_SHIFT); 65 spin_unlock(&pfdev->mm_lock); 66 if (ret) 67 goto free_obj; 68 69 return &obj->base.base; 70 71 free_obj: 72 kfree(obj); 73 return ERR_PTR(ret); 74 } 75 76 struct drm_gem_object * 77 panfrost_gem_prime_import_sg_table(struct drm_device *dev, 78 struct dma_buf_attachment *attach, 79 struct sg_table *sgt) 80 { 81 struct drm_gem_object *obj; 82 struct panfrost_gem_object *pobj; 83 84 obj = drm_gem_shmem_prime_import_sg_table(dev, attach, sgt); 85 if (IS_ERR(obj)) 86 return ERR_CAST(obj); 87 88 pobj = to_panfrost_bo(obj); 89 90 obj->resv = attach->dmabuf->resv; 91 92 panfrost_mmu_map(pobj); 93 94 return obj; 95 } 96