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![Eric Anholt](/assets/img/avatar_default.png)
VC4 wraps the CMA objects in its own structures, so it needs to do its own teardown (waiting for GPU to finish, updating bo_stats tracking). The other CMA drivers are using drm_gem_cma_free_object as their gem_free_object, so this should be a no-op for them. Signed-off-by: Eric Anholt <eric@anholt.net> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
534 lines
15 KiB
C
534 lines
15 KiB
C
/*
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* drm gem CMA (contiguous memory allocator) helper functions
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*
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* Copyright (C) 2012 Sascha Hauer, Pengutronix
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*
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* Based on Samsung Exynos code
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*
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* Copyright (c) 2011 Samsung Electronics Co., Ltd.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/mutex.h>
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#include <linux/export.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/drmP.h>
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#include <drm/drm.h>
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#include <drm/drm_gem_cma_helper.h>
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#include <drm/drm_vma_manager.h>
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/**
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* DOC: cma helpers
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*
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* The Contiguous Memory Allocator reserves a pool of memory at early boot
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* that is used to service requests for large blocks of contiguous memory.
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*
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* The DRM GEM/CMA helpers use this allocator as a means to provide buffer
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* objects that are physically contiguous in memory. This is useful for
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* display drivers that are unable to map scattered buffers via an IOMMU.
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*/
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/**
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* __drm_gem_cma_create - Create a GEM CMA object without allocating memory
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* @drm: DRM device
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* @size: size of the object to allocate
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*
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* This function creates and initializes a GEM CMA object of the given size,
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* but doesn't allocate any memory to back the object.
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*
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* Returns:
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* A struct drm_gem_cma_object * on success or an ERR_PTR()-encoded negative
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* error code on failure.
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*/
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static struct drm_gem_cma_object *
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__drm_gem_cma_create(struct drm_device *drm, size_t size)
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{
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struct drm_gem_cma_object *cma_obj;
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struct drm_gem_object *gem_obj;
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int ret;
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if (drm->driver->gem_create_object)
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gem_obj = drm->driver->gem_create_object(drm, size);
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else
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gem_obj = kzalloc(sizeof(*cma_obj), GFP_KERNEL);
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if (!gem_obj)
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return ERR_PTR(-ENOMEM);
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cma_obj = container_of(gem_obj, struct drm_gem_cma_object, base);
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ret = drm_gem_object_init(drm, gem_obj, size);
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if (ret)
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goto error;
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ret = drm_gem_create_mmap_offset(gem_obj);
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if (ret) {
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drm_gem_object_release(gem_obj);
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goto error;
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}
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return cma_obj;
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error:
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kfree(cma_obj);
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return ERR_PTR(ret);
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}
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/**
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* drm_gem_cma_create - allocate an object with the given size
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* @drm: DRM device
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* @size: size of the object to allocate
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*
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* This function creates a CMA GEM object and allocates a contiguous chunk of
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* memory as backing store. The backing memory has the writecombine attribute
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* set.
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*
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* Returns:
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* A struct drm_gem_cma_object * on success or an ERR_PTR()-encoded negative
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* error code on failure.
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*/
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struct drm_gem_cma_object *drm_gem_cma_create(struct drm_device *drm,
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size_t size)
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{
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struct drm_gem_cma_object *cma_obj;
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int ret;
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size = round_up(size, PAGE_SIZE);
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cma_obj = __drm_gem_cma_create(drm, size);
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if (IS_ERR(cma_obj))
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return cma_obj;
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cma_obj->vaddr = dma_alloc_writecombine(drm->dev, size,
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&cma_obj->paddr, GFP_KERNEL | __GFP_NOWARN);
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if (!cma_obj->vaddr) {
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dev_err(drm->dev, "failed to allocate buffer with size %zu\n",
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size);
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ret = -ENOMEM;
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goto error;
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}
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return cma_obj;
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error:
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drm->driver->gem_free_object(&cma_obj->base);
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return ERR_PTR(ret);
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}
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EXPORT_SYMBOL_GPL(drm_gem_cma_create);
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/**
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* drm_gem_cma_create_with_handle - allocate an object with the given size and
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* return a GEM handle to it
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* @file_priv: DRM file-private structure to register the handle for
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* @drm: DRM device
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* @size: size of the object to allocate
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* @handle: return location for the GEM handle
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*
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* This function creates a CMA GEM object, allocating a physically contiguous
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* chunk of memory as backing store. The GEM object is then added to the list
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* of object associated with the given file and a handle to it is returned.
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*
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* Returns:
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* A struct drm_gem_cma_object * on success or an ERR_PTR()-encoded negative
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* error code on failure.
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*/
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static struct drm_gem_cma_object *
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drm_gem_cma_create_with_handle(struct drm_file *file_priv,
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struct drm_device *drm, size_t size,
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uint32_t *handle)
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{
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struct drm_gem_cma_object *cma_obj;
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struct drm_gem_object *gem_obj;
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int ret;
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cma_obj = drm_gem_cma_create(drm, size);
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if (IS_ERR(cma_obj))
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return cma_obj;
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gem_obj = &cma_obj->base;
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/*
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* allocate a id of idr table where the obj is registered
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* and handle has the id what user can see.
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*/
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ret = drm_gem_handle_create(file_priv, gem_obj, handle);
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if (ret)
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goto err_handle_create;
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/* drop reference from allocate - handle holds it now. */
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drm_gem_object_unreference_unlocked(gem_obj);
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return cma_obj;
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err_handle_create:
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drm->driver->gem_free_object(gem_obj);
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return ERR_PTR(ret);
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}
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/**
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* drm_gem_cma_free_object - free resources associated with a CMA GEM object
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* @gem_obj: GEM object to free
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*
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* This function frees the backing memory of the CMA GEM object, cleans up the
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* GEM object state and frees the memory used to store the object itself.
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* Drivers using the CMA helpers should set this as their DRM driver's
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* ->gem_free_object() callback.
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*/
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void drm_gem_cma_free_object(struct drm_gem_object *gem_obj)
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{
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struct drm_gem_cma_object *cma_obj;
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cma_obj = to_drm_gem_cma_obj(gem_obj);
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if (cma_obj->vaddr) {
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dma_free_writecombine(gem_obj->dev->dev, cma_obj->base.size,
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cma_obj->vaddr, cma_obj->paddr);
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} else if (gem_obj->import_attach) {
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drm_prime_gem_destroy(gem_obj, cma_obj->sgt);
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}
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drm_gem_object_release(gem_obj);
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kfree(cma_obj);
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}
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EXPORT_SYMBOL_GPL(drm_gem_cma_free_object);
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/**
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* drm_gem_cma_dumb_create_internal - create a dumb buffer object
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* @file_priv: DRM file-private structure to create the dumb buffer for
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* @drm: DRM device
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* @args: IOCTL data
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*
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* This aligns the pitch and size arguments to the minimum required. This is
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* an internal helper that can be wrapped by a driver to account for hardware
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* with more specific alignment requirements. It should not be used directly
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* as the ->dumb_create() callback in a DRM driver.
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*
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* Returns:
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* 0 on success or a negative error code on failure.
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*/
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int drm_gem_cma_dumb_create_internal(struct drm_file *file_priv,
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struct drm_device *drm,
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struct drm_mode_create_dumb *args)
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{
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unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
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struct drm_gem_cma_object *cma_obj;
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if (args->pitch < min_pitch)
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args->pitch = min_pitch;
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if (args->size < args->pitch * args->height)
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args->size = args->pitch * args->height;
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cma_obj = drm_gem_cma_create_with_handle(file_priv, drm, args->size,
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&args->handle);
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return PTR_ERR_OR_ZERO(cma_obj);
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}
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EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_create_internal);
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/**
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* drm_gem_cma_dumb_create - create a dumb buffer object
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* @file_priv: DRM file-private structure to create the dumb buffer for
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* @drm: DRM device
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* @args: IOCTL data
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*
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* This function computes the pitch of the dumb buffer and rounds it up to an
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* integer number of bytes per pixel. Drivers for hardware that doesn't have
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* any additional restrictions on the pitch can directly use this function as
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* their ->dumb_create() callback.
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*
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* For hardware with additional restrictions, drivers can adjust the fields
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* set up by userspace and pass the IOCTL data along to the
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* drm_gem_cma_dumb_create_internal() function.
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*
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* Returns:
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* 0 on success or a negative error code on failure.
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*/
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int drm_gem_cma_dumb_create(struct drm_file *file_priv,
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struct drm_device *drm,
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struct drm_mode_create_dumb *args)
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{
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struct drm_gem_cma_object *cma_obj;
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args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
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args->size = args->pitch * args->height;
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cma_obj = drm_gem_cma_create_with_handle(file_priv, drm, args->size,
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&args->handle);
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return PTR_ERR_OR_ZERO(cma_obj);
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}
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EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_create);
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/**
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* drm_gem_cma_dumb_map_offset - return the fake mmap offset for a CMA GEM
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* object
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* @file_priv: DRM file-private structure containing the GEM object
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* @drm: DRM device
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* @handle: GEM object handle
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* @offset: return location for the fake mmap offset
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*
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* This function look up an object by its handle and returns the fake mmap
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* offset associated with it. Drivers using the CMA helpers should set this
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* as their DRM driver's ->dumb_map_offset() callback.
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*
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* Returns:
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* 0 on success or a negative error code on failure.
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*/
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int drm_gem_cma_dumb_map_offset(struct drm_file *file_priv,
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struct drm_device *drm, u32 handle,
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u64 *offset)
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{
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struct drm_gem_object *gem_obj;
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gem_obj = drm_gem_object_lookup(drm, file_priv, handle);
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if (!gem_obj) {
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dev_err(drm->dev, "failed to lookup GEM object\n");
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return -EINVAL;
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}
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*offset = drm_vma_node_offset_addr(&gem_obj->vma_node);
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drm_gem_object_unreference_unlocked(gem_obj);
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return 0;
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}
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EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_map_offset);
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const struct vm_operations_struct drm_gem_cma_vm_ops = {
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.open = drm_gem_vm_open,
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.close = drm_gem_vm_close,
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};
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EXPORT_SYMBOL_GPL(drm_gem_cma_vm_ops);
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static int drm_gem_cma_mmap_obj(struct drm_gem_cma_object *cma_obj,
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struct vm_area_struct *vma)
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{
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int ret;
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/*
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* Clear the VM_PFNMAP flag that was set by drm_gem_mmap(), and set the
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* vm_pgoff (used as a fake buffer offset by DRM) to 0 as we want to map
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* the whole buffer.
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*/
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vma->vm_flags &= ~VM_PFNMAP;
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vma->vm_pgoff = 0;
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ret = dma_mmap_writecombine(cma_obj->base.dev->dev, vma,
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cma_obj->vaddr, cma_obj->paddr,
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vma->vm_end - vma->vm_start);
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if (ret)
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drm_gem_vm_close(vma);
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return ret;
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}
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/**
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* drm_gem_cma_mmap - memory-map a CMA GEM object
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* @filp: file object
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* @vma: VMA for the area to be mapped
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*
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* This function implements an augmented version of the GEM DRM file mmap
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* operation for CMA objects: In addition to the usual GEM VMA setup it
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* immediately faults in the entire object instead of using on-demaind
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* faulting. Drivers which employ the CMA helpers should use this function
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* as their ->mmap() handler in the DRM device file's file_operations
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* structure.
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*
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* Returns:
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* 0 on success or a negative error code on failure.
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*/
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int drm_gem_cma_mmap(struct file *filp, struct vm_area_struct *vma)
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{
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struct drm_gem_cma_object *cma_obj;
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struct drm_gem_object *gem_obj;
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int ret;
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ret = drm_gem_mmap(filp, vma);
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if (ret)
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return ret;
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gem_obj = vma->vm_private_data;
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cma_obj = to_drm_gem_cma_obj(gem_obj);
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return drm_gem_cma_mmap_obj(cma_obj, vma);
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}
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EXPORT_SYMBOL_GPL(drm_gem_cma_mmap);
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#ifdef CONFIG_DEBUG_FS
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/**
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* drm_gem_cma_describe - describe a CMA GEM object for debugfs
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* @cma_obj: CMA GEM object
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* @m: debugfs file handle
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*
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* This function can be used to dump a human-readable representation of the
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* CMA GEM object into a synthetic file.
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*/
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void drm_gem_cma_describe(struct drm_gem_cma_object *cma_obj,
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struct seq_file *m)
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{
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struct drm_gem_object *obj = &cma_obj->base;
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uint64_t off;
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off = drm_vma_node_start(&obj->vma_node);
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seq_printf(m, "%2d (%2d) %08llx %pad %p %zu",
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obj->name, obj->refcount.refcount.counter,
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off, &cma_obj->paddr, cma_obj->vaddr, obj->size);
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seq_printf(m, "\n");
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}
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EXPORT_SYMBOL_GPL(drm_gem_cma_describe);
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#endif
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/**
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* drm_gem_cma_prime_get_sg_table - provide a scatter/gather table of pinned
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* pages for a CMA GEM object
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* @obj: GEM object
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*
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* This function exports a scatter/gather table suitable for PRIME usage by
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* calling the standard DMA mapping API. Drivers using the CMA helpers should
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* set this as their DRM driver's ->gem_prime_get_sg_table() callback.
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*
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* Returns:
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* A pointer to the scatter/gather table of pinned pages or NULL on failure.
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*/
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struct sg_table *drm_gem_cma_prime_get_sg_table(struct drm_gem_object *obj)
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{
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struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(obj);
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struct sg_table *sgt;
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int ret;
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sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
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if (!sgt)
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return NULL;
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ret = dma_get_sgtable(obj->dev->dev, sgt, cma_obj->vaddr,
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cma_obj->paddr, obj->size);
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if (ret < 0)
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goto out;
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return sgt;
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out:
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kfree(sgt);
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return NULL;
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}
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EXPORT_SYMBOL_GPL(drm_gem_cma_prime_get_sg_table);
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/**
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* drm_gem_cma_prime_import_sg_table - produce a CMA GEM object from another
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* driver's scatter/gather table of pinned pages
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* @dev: device to import into
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* @attach: DMA-BUF attachment
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* @sgt: scatter/gather table of pinned pages
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*
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* This function imports a scatter/gather table exported via DMA-BUF by
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* another driver. Imported buffers must be physically contiguous in memory
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* (i.e. the scatter/gather table must contain a single entry). Drivers that
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* use the CMA helpers should set this as their DRM driver's
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* ->gem_prime_import_sg_table() callback.
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*
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* Returns:
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* A pointer to a newly created GEM object or an ERR_PTR-encoded negative
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* error code on failure.
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*/
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struct drm_gem_object *
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drm_gem_cma_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_cma_object *cma_obj;
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if (sgt->nents != 1)
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return ERR_PTR(-EINVAL);
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/* Create a CMA GEM buffer. */
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cma_obj = __drm_gem_cma_create(dev, attach->dmabuf->size);
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if (IS_ERR(cma_obj))
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return ERR_CAST(cma_obj);
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cma_obj->paddr = sg_dma_address(sgt->sgl);
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cma_obj->sgt = sgt;
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DRM_DEBUG_PRIME("dma_addr = %pad, size = %zu\n", &cma_obj->paddr, attach->dmabuf->size);
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return &cma_obj->base;
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}
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EXPORT_SYMBOL_GPL(drm_gem_cma_prime_import_sg_table);
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/**
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* drm_gem_cma_prime_mmap - memory-map an exported CMA GEM object
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* @obj: GEM object
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* @vma: VMA for the area to be mapped
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*
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* This function maps a buffer imported via DRM PRIME into a userspace
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* process's address space. Drivers that use the CMA helpers should set this
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* as their DRM driver's ->gem_prime_mmap() callback.
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*
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* Returns:
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* 0 on success or a negative error code on failure.
|
|
*/
|
|
int drm_gem_cma_prime_mmap(struct drm_gem_object *obj,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
struct drm_gem_cma_object *cma_obj;
|
|
int ret;
|
|
|
|
ret = drm_gem_mmap_obj(obj, obj->size, vma);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
cma_obj = to_drm_gem_cma_obj(obj);
|
|
return drm_gem_cma_mmap_obj(cma_obj, vma);
|
|
}
|
|
EXPORT_SYMBOL_GPL(drm_gem_cma_prime_mmap);
|
|
|
|
/**
|
|
* drm_gem_cma_prime_vmap - map a CMA GEM object into the kernel's virtual
|
|
* address space
|
|
* @obj: GEM object
|
|
*
|
|
* This function maps a buffer exported via DRM PRIME into the kernel's
|
|
* virtual address space. Since the CMA buffers are already mapped into the
|
|
* kernel virtual address space this simply returns the cached virtual
|
|
* address. Drivers using the CMA helpers should set this as their DRM
|
|
* driver's ->gem_prime_vmap() callback.
|
|
*
|
|
* Returns:
|
|
* The kernel virtual address of the CMA GEM object's backing store.
|
|
*/
|
|
void *drm_gem_cma_prime_vmap(struct drm_gem_object *obj)
|
|
{
|
|
struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(obj);
|
|
|
|
return cma_obj->vaddr;
|
|
}
|
|
EXPORT_SYMBOL_GPL(drm_gem_cma_prime_vmap);
|
|
|
|
/**
|
|
* drm_gem_cma_prime_vunmap - unmap a CMA GEM object from the kernel's virtual
|
|
* address space
|
|
* @obj: GEM object
|
|
* @vaddr: kernel virtual address where the CMA GEM object was mapped
|
|
*
|
|
* This function removes a buffer exported via DRM PRIME from the kernel's
|
|
* virtual address space. This is a no-op because CMA buffers cannot be
|
|
* unmapped from kernel space. Drivers using the CMA helpers should set this
|
|
* as their DRM driver's ->gem_prime_vunmap() callback.
|
|
*/
|
|
void drm_gem_cma_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
|
|
{
|
|
/* Nothing to do */
|
|
}
|
|
EXPORT_SYMBOL_GPL(drm_gem_cma_prime_vunmap);
|