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d46e7ae24b
It is a common operation done by DRM drivers to check the contiguity of the DMA-mapped buffer described by a scatterlist in the sg_table object. Let's add a common helper for this operation. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Reviewed-by: Andrzej Hajda <a.hajda@samsung.com> Reviewed-by: Robin Murphy <robin.murphy@arm.com>
639 lines
19 KiB
C
639 lines
19 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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#include <linux/dma-buf.h>
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#include <linux/dma-mapping.h>
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#include <linux/export.h>
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#include <linux/mm.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <drm/drm.h>
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#include <drm/drm_device.h>
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#include <drm/drm_drv.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_wc(drm->dev, size, &cma_obj->paddr,
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GFP_KERNEL | __GFP_NOWARN);
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if (!cma_obj->vaddr) {
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drm_dbg(drm, "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_gem_object_put(&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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/* drop reference from allocate - handle holds it now. */
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drm_gem_object_put(gem_obj);
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if (ret)
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return ERR_PTR(ret);
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return cma_obj;
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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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* If the buffer is imported and the virtual address is set, it is released.
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* Drivers using the CMA helpers should set this as their
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* &drm_driver.gem_free_object_unlocked 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 (gem_obj->import_attach) {
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if (cma_obj->vaddr)
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dma_buf_vunmap(gem_obj->import_attach->dmabuf, cma_obj->vaddr);
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drm_prime_gem_destroy(gem_obj, cma_obj->sgt);
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} else if (cma_obj->vaddr) {
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dma_free_wc(gem_obj->dev->dev, cma_obj->base.size,
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cma_obj->vaddr, cma_obj->paddr);
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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 their &drm_driver.dumb_create 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_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 &drm_driver.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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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_wc(cma_obj->base.dev->dev, vma, cma_obj->vaddr,
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cma_obj->paddr, 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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* Instead of directly referencing this function, drivers should use the
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* DEFINE_DRM_GEM_CMA_FOPS().macro.
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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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#ifndef CONFIG_MMU
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/**
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* drm_gem_cma_get_unmapped_area - propose address for mapping in noMMU cases
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* @filp: file object
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* @addr: memory address
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* @len: buffer size
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* @pgoff: page offset
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* @flags: memory flags
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*
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* This function is used in noMMU platforms to propose address mapping
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* for a given buffer.
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* It's intended to be used as a direct handler for the struct
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* &file_operations.get_unmapped_area operation.
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*
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* Returns:
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* mapping address on success or a negative error code on failure.
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*/
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unsigned long drm_gem_cma_get_unmapped_area(struct file *filp,
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unsigned long addr,
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unsigned long len,
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unsigned long pgoff,
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unsigned long flags)
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{
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struct drm_gem_cma_object *cma_obj;
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struct drm_gem_object *obj = NULL;
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struct drm_file *priv = filp->private_data;
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struct drm_device *dev = priv->minor->dev;
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struct drm_vma_offset_node *node;
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if (drm_dev_is_unplugged(dev))
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return -ENODEV;
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drm_vma_offset_lock_lookup(dev->vma_offset_manager);
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node = drm_vma_offset_exact_lookup_locked(dev->vma_offset_manager,
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pgoff,
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len >> PAGE_SHIFT);
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if (likely(node)) {
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obj = container_of(node, struct drm_gem_object, vma_node);
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/*
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* When the object is being freed, after it hits 0-refcnt it
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* proceeds to tear down the object. In the process it will
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* attempt to remove the VMA offset and so acquire this
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* mgr->vm_lock. Therefore if we find an object with a 0-refcnt
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* that matches our range, we know it is in the process of being
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* destroyed and will be freed as soon as we release the lock -
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* so we have to check for the 0-refcnted object and treat it as
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* invalid.
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*/
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if (!kref_get_unless_zero(&obj->refcount))
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obj = NULL;
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}
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drm_vma_offset_unlock_lookup(dev->vma_offset_manager);
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if (!obj)
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return -EINVAL;
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if (!drm_vma_node_is_allowed(node, priv)) {
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drm_gem_object_put(obj);
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return -EACCES;
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}
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cma_obj = to_drm_gem_cma_obj(obj);
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drm_gem_object_put(obj);
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return cma_obj->vaddr ? (unsigned long)cma_obj->vaddr : -EINVAL;
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}
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EXPORT_SYMBOL_GPL(drm_gem_cma_get_unmapped_area);
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#endif
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/**
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* drm_gem_cma_print_info() - Print &drm_gem_cma_object info for debugfs
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* @p: DRM printer
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* @indent: Tab indentation level
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* @obj: GEM object
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*
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* This function can be used as the &drm_driver->gem_print_info callback.
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* It prints paddr and vaddr for use in e.g. debugfs output.
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*/
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void drm_gem_cma_print_info(struct drm_printer *p, unsigned int indent,
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const struct drm_gem_object *obj)
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{
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const struct drm_gem_cma_object *cma_obj = to_drm_gem_cma_obj(obj);
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drm_printf_indent(p, indent, "paddr=%pad\n", &cma_obj->paddr);
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drm_printf_indent(p, indent, "vaddr=%p\n", cma_obj->vaddr);
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}
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EXPORT_SYMBOL(drm_gem_cma_print_info);
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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.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 ERR_PTR(-ENOMEM);
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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 ERR_PTR(ret);
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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
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* &drm_driver.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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/* check if the entries in the sg_table are contiguous */
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if (drm_prime_get_contiguous_size(sgt) < attach->dmabuf->size)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
/* Create a CMA GEM buffer. */
|
|
cma_obj = __drm_gem_cma_create(dev, attach->dmabuf->size);
|
|
if (IS_ERR(cma_obj))
|
|
return ERR_CAST(cma_obj);
|
|
|
|
cma_obj->paddr = sg_dma_address(sgt->sgl);
|
|
cma_obj->sgt = sgt;
|
|
|
|
DRM_DEBUG_PRIME("dma_addr = %pad, size = %zu\n", &cma_obj->paddr, attach->dmabuf->size);
|
|
|
|
return &cma_obj->base;
|
|
}
|
|
EXPORT_SYMBOL_GPL(drm_gem_cma_prime_import_sg_table);
|
|
|
|
/**
|
|
* drm_gem_cma_prime_mmap - memory-map an exported CMA GEM object
|
|
* @obj: GEM object
|
|
* @vma: VMA for the area to be mapped
|
|
*
|
|
* This function maps a buffer imported via DRM PRIME into a userspace
|
|
* process's address space. Drivers that use the CMA helpers should set this
|
|
* as their &drm_driver.gem_prime_mmap callback.
|
|
*
|
|
* Returns:
|
|
* 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 &drm_driver.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.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);
|
|
|
|
static const struct drm_gem_object_funcs drm_gem_cma_default_funcs = {
|
|
.free = drm_gem_cma_free_object,
|
|
.print_info = drm_gem_cma_print_info,
|
|
.get_sg_table = drm_gem_cma_prime_get_sg_table,
|
|
.vmap = drm_gem_cma_prime_vmap,
|
|
.vm_ops = &drm_gem_cma_vm_ops,
|
|
};
|
|
|
|
/**
|
|
* drm_gem_cma_create_object_default_funcs - Create a CMA GEM object with a
|
|
* default function table
|
|
* @dev: DRM device
|
|
* @size: Size of the object to allocate
|
|
*
|
|
* This sets the GEM object functions to the default CMA helper functions.
|
|
* This function can be used as the &drm_driver.gem_create_object callback.
|
|
*
|
|
* Returns:
|
|
* A pointer to a allocated GEM object or an error pointer on failure.
|
|
*/
|
|
struct drm_gem_object *
|
|
drm_gem_cma_create_object_default_funcs(struct drm_device *dev, size_t size)
|
|
{
|
|
struct drm_gem_cma_object *cma_obj;
|
|
|
|
cma_obj = kzalloc(sizeof(*cma_obj), GFP_KERNEL);
|
|
if (!cma_obj)
|
|
return NULL;
|
|
|
|
cma_obj->base.funcs = &drm_gem_cma_default_funcs;
|
|
|
|
return &cma_obj->base;
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_cma_create_object_default_funcs);
|
|
|
|
/**
|
|
* drm_gem_cma_prime_import_sg_table_vmap - PRIME import another driver's
|
|
* scatter/gather table and get the virtual address of the buffer
|
|
* @dev: DRM device
|
|
* @attach: DMA-BUF attachment
|
|
* @sgt: Scatter/gather table of pinned pages
|
|
*
|
|
* This function imports a scatter/gather table using
|
|
* drm_gem_cma_prime_import_sg_table() and uses dma_buf_vmap() to get the kernel
|
|
* virtual address. This ensures that a CMA GEM object always has its virtual
|
|
* address set. This address is released when the object is freed.
|
|
*
|
|
* This function can be used as the &drm_driver.gem_prime_import_sg_table
|
|
* callback. The &DRM_GEM_CMA_DRIVER_OPS_VMAP macro provides a shortcut to set
|
|
* the necessary DRM driver operations.
|
|
*
|
|
* Returns:
|
|
* A pointer to a newly created GEM object or an ERR_PTR-encoded negative
|
|
* error code on failure.
|
|
*/
|
|
struct drm_gem_object *
|
|
drm_gem_cma_prime_import_sg_table_vmap(struct drm_device *dev,
|
|
struct dma_buf_attachment *attach,
|
|
struct sg_table *sgt)
|
|
{
|
|
struct drm_gem_cma_object *cma_obj;
|
|
struct drm_gem_object *obj;
|
|
void *vaddr;
|
|
|
|
vaddr = dma_buf_vmap(attach->dmabuf);
|
|
if (!vaddr) {
|
|
DRM_ERROR("Failed to vmap PRIME buffer\n");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
obj = drm_gem_cma_prime_import_sg_table(dev, attach, sgt);
|
|
if (IS_ERR(obj)) {
|
|
dma_buf_vunmap(attach->dmabuf, vaddr);
|
|
return obj;
|
|
}
|
|
|
|
cma_obj = to_drm_gem_cma_obj(obj);
|
|
cma_obj->vaddr = vaddr;
|
|
|
|
return obj;
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_cma_prime_import_sg_table_vmap);
|