634 lines
21 KiB
C
634 lines
21 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Header file for dma buffer sharing framework.
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*
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* Copyright(C) 2011 Linaro Limited. All rights reserved.
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* Author: Sumit Semwal <sumit.semwal@ti.com>
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*
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* Many thanks to linaro-mm-sig list, and specially
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* Arnd Bergmann <arnd@arndb.de>, Rob Clark <rob@ti.com> and
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* Daniel Vetter <daniel@ffwll.ch> for their support in creation and
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* refining of this idea.
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*/
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#ifndef __DMA_BUF_H__
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#define __DMA_BUF_H__
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#include <linux/dma-buf-map.h>
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#include <linux/file.h>
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#include <linux/err.h>
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#include <linux/scatterlist.h>
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#include <linux/list.h>
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#include <linux/dma-mapping.h>
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#include <linux/fs.h>
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#include <linux/dma-fence.h>
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#include <linux/wait.h>
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struct device;
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struct dma_buf;
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struct dma_buf_attachment;
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/**
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* struct dma_buf_ops - operations possible on struct dma_buf
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* @vmap: [optional] creates a virtual mapping for the buffer into kernel
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* address space. Same restrictions as for vmap and friends apply.
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* @vunmap: [optional] unmaps a vmap from the buffer
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*/
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struct dma_buf_ops {
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/**
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* @cache_sgt_mapping:
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*
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* If true the framework will cache the first mapping made for each
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* attachment. This avoids creating mappings for attachments multiple
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* times.
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*/
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bool cache_sgt_mapping;
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/**
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* @attach:
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*
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* This is called from dma_buf_attach() to make sure that a given
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* &dma_buf_attachment.dev can access the provided &dma_buf. Exporters
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* which support buffer objects in special locations like VRAM or
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* device-specific carveout areas should check whether the buffer could
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* be move to system memory (or directly accessed by the provided
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* device), and otherwise need to fail the attach operation.
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*
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* The exporter should also in general check whether the current
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* allocation fulfills the DMA constraints of the new device. If this
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* is not the case, and the allocation cannot be moved, it should also
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* fail the attach operation.
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*
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* Any exporter-private housekeeping data can be stored in the
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* &dma_buf_attachment.priv pointer.
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*
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* This callback is optional.
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*
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* Returns:
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*
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* 0 on success, negative error code on failure. It might return -EBUSY
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* to signal that backing storage is already allocated and incompatible
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* with the requirements of requesting device.
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*/
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int (*attach)(struct dma_buf *, struct dma_buf_attachment *);
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/**
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* @detach:
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*
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* This is called by dma_buf_detach() to release a &dma_buf_attachment.
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* Provided so that exporters can clean up any housekeeping for an
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* &dma_buf_attachment.
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*
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* This callback is optional.
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*/
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void (*detach)(struct dma_buf *, struct dma_buf_attachment *);
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/**
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* @pin:
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*
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* This is called by dma_buf_pin() and lets the exporter know that the
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* DMA-buf can't be moved any more. Ideally, the exporter should
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* pin the buffer so that it is generally accessible by all
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* devices.
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*
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* This is called with the &dmabuf.resv object locked and is mutual
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* exclusive with @cache_sgt_mapping.
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*
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* This is called automatically for non-dynamic importers from
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* dma_buf_attach().
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*
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* Note that similar to non-dynamic exporters in their @map_dma_buf
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* callback the driver must guarantee that the memory is available for
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* use and cleared of any old data by the time this function returns.
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* Drivers which pipeline their buffer moves internally must wait for
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* all moves and clears to complete.
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*
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* Returns:
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*
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* 0 on success, negative error code on failure.
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*/
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int (*pin)(struct dma_buf_attachment *attach);
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/**
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* @unpin:
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*
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* This is called by dma_buf_unpin() and lets the exporter know that the
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* DMA-buf can be moved again.
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*
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* This is called with the dmabuf->resv object locked and is mutual
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* exclusive with @cache_sgt_mapping.
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*
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* This callback is optional.
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*/
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void (*unpin)(struct dma_buf_attachment *attach);
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/**
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* @map_dma_buf:
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*
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* This is called by dma_buf_map_attachment() and is used to map a
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* shared &dma_buf into device address space, and it is mandatory. It
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* can only be called if @attach has been called successfully.
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*
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* This call may sleep, e.g. when the backing storage first needs to be
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* allocated, or moved to a location suitable for all currently attached
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* devices.
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*
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* Note that any specific buffer attributes required for this function
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* should get added to device_dma_parameters accessible via
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* &device.dma_params from the &dma_buf_attachment. The @attach callback
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* should also check these constraints.
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*
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* If this is being called for the first time, the exporter can now
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* choose to scan through the list of attachments for this buffer,
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* collate the requirements of the attached devices, and choose an
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* appropriate backing storage for the buffer.
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*
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* Based on enum dma_data_direction, it might be possible to have
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* multiple users accessing at the same time (for reading, maybe), or
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* any other kind of sharing that the exporter might wish to make
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* available to buffer-users.
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*
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* This is always called with the dmabuf->resv object locked when
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* the dynamic_mapping flag is true.
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*
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* Note that for non-dynamic exporters the driver must guarantee that
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* that the memory is available for use and cleared of any old data by
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* the time this function returns. Drivers which pipeline their buffer
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* moves internally must wait for all moves and clears to complete.
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* Dynamic exporters do not need to follow this rule: For non-dynamic
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* importers the buffer is already pinned through @pin, which has the
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* same requirements. Dynamic importers otoh are required to obey the
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* dma_resv fences.
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*
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* Returns:
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*
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* A &sg_table scatter list of the backing storage of the DMA buffer,
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* already mapped into the device address space of the &device attached
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* with the provided &dma_buf_attachment. The addresses and lengths in
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* the scatter list are PAGE_SIZE aligned.
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*
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* On failure, returns a negative error value wrapped into a pointer.
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* May also return -EINTR when a signal was received while being
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* blocked.
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*
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* Note that exporters should not try to cache the scatter list, or
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* return the same one for multiple calls. Caching is done either by the
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* DMA-BUF code (for non-dynamic importers) or the importer. Ownership
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* of the scatter list is transferred to the caller, and returned by
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* @unmap_dma_buf.
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*/
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struct sg_table * (*map_dma_buf)(struct dma_buf_attachment *,
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enum dma_data_direction);
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/**
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* @unmap_dma_buf:
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*
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* This is called by dma_buf_unmap_attachment() and should unmap and
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* release the &sg_table allocated in @map_dma_buf, and it is mandatory.
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* For static dma_buf handling this might also unpin the backing
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* storage if this is the last mapping of the DMA buffer.
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*/
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void (*unmap_dma_buf)(struct dma_buf_attachment *,
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struct sg_table *,
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enum dma_data_direction);
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/* TODO: Add try_map_dma_buf version, to return immed with -EBUSY
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* if the call would block.
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*/
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/**
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* @release:
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*
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* Called after the last dma_buf_put to release the &dma_buf, and
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* mandatory.
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*/
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void (*release)(struct dma_buf *);
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/**
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* @begin_cpu_access:
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*
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* This is called from dma_buf_begin_cpu_access() and allows the
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* exporter to ensure that the memory is actually coherent for cpu
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* access. The exporter also needs to ensure that cpu access is coherent
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* for the access direction. The direction can be used by the exporter
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* to optimize the cache flushing, i.e. access with a different
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* direction (read instead of write) might return stale or even bogus
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* data (e.g. when the exporter needs to copy the data to temporary
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* storage).
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*
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* Note that this is both called through the DMA_BUF_IOCTL_SYNC IOCTL
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* command for userspace mappings established through @mmap, and also
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* for kernel mappings established with @vmap.
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*
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* This callback is optional.
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*
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* Returns:
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*
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* 0 on success or a negative error code on failure. This can for
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* example fail when the backing storage can't be allocated. Can also
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* return -ERESTARTSYS or -EINTR when the call has been interrupted and
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* needs to be restarted.
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*/
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int (*begin_cpu_access)(struct dma_buf *, enum dma_data_direction);
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/**
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* @end_cpu_access:
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*
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* This is called from dma_buf_end_cpu_access() when the importer is
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* done accessing the CPU. The exporter can use this to flush caches and
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* undo anything else done in @begin_cpu_access.
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*
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* This callback is optional.
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*
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* Returns:
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*
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* 0 on success or a negative error code on failure. Can return
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* -ERESTARTSYS or -EINTR when the call has been interrupted and needs
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* to be restarted.
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*/
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int (*end_cpu_access)(struct dma_buf *, enum dma_data_direction);
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/**
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* @mmap:
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*
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* This callback is used by the dma_buf_mmap() function
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*
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* Note that the mapping needs to be incoherent, userspace is expected
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* to bracket CPU access using the DMA_BUF_IOCTL_SYNC interface.
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*
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* Because dma-buf buffers have invariant size over their lifetime, the
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* dma-buf core checks whether a vma is too large and rejects such
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* mappings. The exporter hence does not need to duplicate this check.
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* Drivers do not need to check this themselves.
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*
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* If an exporter needs to manually flush caches and hence needs to fake
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* coherency for mmap support, it needs to be able to zap all the ptes
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* pointing at the backing storage. Now linux mm needs a struct
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* address_space associated with the struct file stored in vma->vm_file
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* to do that with the function unmap_mapping_range. But the dma_buf
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* framework only backs every dma_buf fd with the anon_file struct file,
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* i.e. all dma_bufs share the same file.
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*
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* Hence exporters need to setup their own file (and address_space)
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* association by setting vma->vm_file and adjusting vma->vm_pgoff in
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* the dma_buf mmap callback. In the specific case of a gem driver the
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* exporter could use the shmem file already provided by gem (and set
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* vm_pgoff = 0). Exporters can then zap ptes by unmapping the
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* corresponding range of the struct address_space associated with their
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* own file.
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*
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* This callback is optional.
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*
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* Returns:
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*
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* 0 on success or a negative error code on failure.
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*/
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int (*mmap)(struct dma_buf *, struct vm_area_struct *vma);
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int (*vmap)(struct dma_buf *dmabuf, struct dma_buf_map *map);
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void (*vunmap)(struct dma_buf *dmabuf, struct dma_buf_map *map);
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};
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/**
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* struct dma_buf - shared buffer object
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*
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* This represents a shared buffer, created by calling dma_buf_export(). The
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* userspace representation is a normal file descriptor, which can be created by
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* calling dma_buf_fd().
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*
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* Shared dma buffers are reference counted using dma_buf_put() and
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* get_dma_buf().
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*
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* Device DMA access is handled by the separate &struct dma_buf_attachment.
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*/
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struct dma_buf {
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/**
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* @size:
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*
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* Size of the buffer; invariant over the lifetime of the buffer.
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*/
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size_t size;
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/**
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* @file:
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*
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* File pointer used for sharing buffers across, and for refcounting.
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* See dma_buf_get() and dma_buf_put().
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*/
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struct file *file;
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/**
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* @attachments:
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*
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* List of dma_buf_attachment that denotes all devices attached,
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* protected by &dma_resv lock @resv.
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*/
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struct list_head attachments;
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/** @ops: dma_buf_ops associated with this buffer object. */
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const struct dma_buf_ops *ops;
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/**
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* @lock:
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*
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* Used internally to serialize list manipulation, attach/detach and
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* vmap/unmap. Note that in many cases this is superseeded by
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* dma_resv_lock() on @resv.
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*/
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struct mutex lock;
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/**
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* @vmapping_counter:
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*
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* Used internally to refcnt the vmaps returned by dma_buf_vmap().
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* Protected by @lock.
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*/
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unsigned vmapping_counter;
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/**
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* @vmap_ptr:
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* The current vmap ptr if @vmapping_counter > 0. Protected by @lock.
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*/
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struct dma_buf_map vmap_ptr;
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/**
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* @exp_name:
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*
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* Name of the exporter; useful for debugging. See the
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* DMA_BUF_SET_NAME IOCTL.
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*/
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const char *exp_name;
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/**
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* @name:
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*
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* Userspace-provided name; useful for accounting and debugging,
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* protected by dma_resv_lock() on @resv and @name_lock for read access.
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*/
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const char *name;
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/** @name_lock: Spinlock to protect name acces for read access. */
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spinlock_t name_lock;
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/**
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* @owner:
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*
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* Pointer to exporter module; used for refcounting when exporter is a
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* kernel module.
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*/
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struct module *owner;
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/** @list_node: node for dma_buf accounting and debugging. */
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struct list_head list_node;
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/** @priv: exporter specific private data for this buffer object. */
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void *priv;
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/**
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* @resv:
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*
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* Reservation object linked to this dma-buf.
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*
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* IMPLICIT SYNCHRONIZATION RULES:
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*
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* Drivers which support implicit synchronization of buffer access as
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* e.g. exposed in `Implicit Fence Poll Support`_ must follow the
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* below rules.
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*
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* - Drivers must add a shared fence through dma_resv_add_shared_fence()
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* for anything the userspace API considers a read access. This highly
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* depends upon the API and window system.
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*
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* - Similarly drivers must set the exclusive fence through
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* dma_resv_add_excl_fence() for anything the userspace API considers
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* write access.
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*
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* - Drivers may just always set the exclusive fence, since that only
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* causes unecessarily synchronization, but no correctness issues.
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*
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* - Some drivers only expose a synchronous userspace API with no
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* pipelining across drivers. These do not set any fences for their
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* access. An example here is v4l.
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*
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* DYNAMIC IMPORTER RULES:
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*
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* Dynamic importers, see dma_buf_attachment_is_dynamic(), have
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* additional constraints on how they set up fences:
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*
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* - Dynamic importers must obey the exclusive fence and wait for it to
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* signal before allowing access to the buffer's underlying storage
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* through the device.
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*
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* - Dynamic importers should set fences for any access that they can't
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* disable immediately from their &dma_buf_attach_ops.move_notify
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* callback.
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*
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* IMPORTANT:
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*
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* All drivers must obey the struct dma_resv rules, specifically the
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* rules for updating fences, see &dma_resv.fence_excl and
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* &dma_resv.fence. If these dependency rules are broken access tracking
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* can be lost resulting in use after free issues.
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*/
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struct dma_resv *resv;
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/** @poll: for userspace poll support */
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wait_queue_head_t poll;
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/** @cb_excl: for userspace poll support */
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/** @cb_shared: for userspace poll support */
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struct dma_buf_poll_cb_t {
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struct dma_fence_cb cb;
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wait_queue_head_t *poll;
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__poll_t active;
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} cb_in, cb_out;
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#ifdef CONFIG_DMABUF_SYSFS_STATS
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/**
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* @sysfs_entry:
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*
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* For exposing information about this buffer in sysfs. See also
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* `DMA-BUF statistics`_ for the uapi this enables.
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*/
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struct dma_buf_sysfs_entry {
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struct kobject kobj;
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struct dma_buf *dmabuf;
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} *sysfs_entry;
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#endif
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};
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/**
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* struct dma_buf_attach_ops - importer operations for an attachment
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*
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* Attachment operations implemented by the importer.
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*/
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struct dma_buf_attach_ops {
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/**
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* @allow_peer2peer:
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*
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* If this is set to true the importer must be able to handle peer
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* resources without struct pages.
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*/
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bool allow_peer2peer;
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/**
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* @move_notify: [optional] notification that the DMA-buf is moving
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*
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* If this callback is provided the framework can avoid pinning the
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* backing store while mappings exists.
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*
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* This callback is called with the lock of the reservation object
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* associated with the dma_buf held and the mapping function must be
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* called with this lock held as well. This makes sure that no mapping
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* is created concurrently with an ongoing move operation.
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*
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* Mappings stay valid and are not directly affected by this callback.
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* But the DMA-buf can now be in a different physical location, so all
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* mappings should be destroyed and re-created as soon as possible.
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*
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* New mappings can be created after this callback returns, and will
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* point to the new location of the DMA-buf.
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*/
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void (*move_notify)(struct dma_buf_attachment *attach);
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};
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/**
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* struct dma_buf_attachment - holds device-buffer attachment data
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* @dmabuf: buffer for this attachment.
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* @dev: device attached to the buffer.
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* @node: list of dma_buf_attachment, protected by dma_resv lock of the dmabuf.
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* @sgt: cached mapping.
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* @dir: direction of cached mapping.
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* @peer2peer: true if the importer can handle peer resources without pages.
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* @priv: exporter specific attachment data.
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* @importer_ops: importer operations for this attachment, if provided
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* dma_buf_map/unmap_attachment() must be called with the dma_resv lock held.
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* @importer_priv: importer specific attachment data.
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*
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|
* This structure holds the attachment information between the dma_buf buffer
|
|
* and its user device(s). The list contains one attachment struct per device
|
|
* attached to the buffer.
|
|
*
|
|
* An attachment is created by calling dma_buf_attach(), and released again by
|
|
* calling dma_buf_detach(). The DMA mapping itself needed to initiate a
|
|
* transfer is created by dma_buf_map_attachment() and freed again by calling
|
|
* dma_buf_unmap_attachment().
|
|
*/
|
|
struct dma_buf_attachment {
|
|
struct dma_buf *dmabuf;
|
|
struct device *dev;
|
|
struct list_head node;
|
|
struct sg_table *sgt;
|
|
enum dma_data_direction dir;
|
|
bool peer2peer;
|
|
const struct dma_buf_attach_ops *importer_ops;
|
|
void *importer_priv;
|
|
void *priv;
|
|
};
|
|
|
|
/**
|
|
* struct dma_buf_export_info - holds information needed to export a dma_buf
|
|
* @exp_name: name of the exporter - useful for debugging.
|
|
* @owner: pointer to exporter module - used for refcounting kernel module
|
|
* @ops: Attach allocator-defined dma buf ops to the new buffer
|
|
* @size: Size of the buffer - invariant over the lifetime of the buffer
|
|
* @flags: mode flags for the file
|
|
* @resv: reservation-object, NULL to allocate default one
|
|
* @priv: Attach private data of allocator to this buffer
|
|
*
|
|
* This structure holds the information required to export the buffer. Used
|
|
* with dma_buf_export() only.
|
|
*/
|
|
struct dma_buf_export_info {
|
|
const char *exp_name;
|
|
struct module *owner;
|
|
const struct dma_buf_ops *ops;
|
|
size_t size;
|
|
int flags;
|
|
struct dma_resv *resv;
|
|
void *priv;
|
|
};
|
|
|
|
/**
|
|
* DEFINE_DMA_BUF_EXPORT_INFO - helper macro for exporters
|
|
* @name: export-info name
|
|
*
|
|
* DEFINE_DMA_BUF_EXPORT_INFO macro defines the &struct dma_buf_export_info,
|
|
* zeroes it out and pre-populates exp_name in it.
|
|
*/
|
|
#define DEFINE_DMA_BUF_EXPORT_INFO(name) \
|
|
struct dma_buf_export_info name = { .exp_name = KBUILD_MODNAME, \
|
|
.owner = THIS_MODULE }
|
|
|
|
/**
|
|
* get_dma_buf - convenience wrapper for get_file.
|
|
* @dmabuf: [in] pointer to dma_buf
|
|
*
|
|
* Increments the reference count on the dma-buf, needed in case of drivers
|
|
* that either need to create additional references to the dmabuf on the
|
|
* kernel side. For example, an exporter that needs to keep a dmabuf ptr
|
|
* so that subsequent exports don't create a new dmabuf.
|
|
*/
|
|
static inline void get_dma_buf(struct dma_buf *dmabuf)
|
|
{
|
|
get_file(dmabuf->file);
|
|
}
|
|
|
|
/**
|
|
* dma_buf_is_dynamic - check if a DMA-buf uses dynamic mappings.
|
|
* @dmabuf: the DMA-buf to check
|
|
*
|
|
* Returns true if a DMA-buf exporter wants to be called with the dma_resv
|
|
* locked for the map/unmap callbacks, false if it doesn't wants to be called
|
|
* with the lock held.
|
|
*/
|
|
static inline bool dma_buf_is_dynamic(struct dma_buf *dmabuf)
|
|
{
|
|
return !!dmabuf->ops->pin;
|
|
}
|
|
|
|
/**
|
|
* dma_buf_attachment_is_dynamic - check if a DMA-buf attachment uses dynamic
|
|
* mappings
|
|
* @attach: the DMA-buf attachment to check
|
|
*
|
|
* Returns true if a DMA-buf importer wants to call the map/unmap functions with
|
|
* the dma_resv lock held.
|
|
*/
|
|
static inline bool
|
|
dma_buf_attachment_is_dynamic(struct dma_buf_attachment *attach)
|
|
{
|
|
return !!attach->importer_ops;
|
|
}
|
|
|
|
struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf,
|
|
struct device *dev);
|
|
struct dma_buf_attachment *
|
|
dma_buf_dynamic_attach(struct dma_buf *dmabuf, struct device *dev,
|
|
const struct dma_buf_attach_ops *importer_ops,
|
|
void *importer_priv);
|
|
void dma_buf_detach(struct dma_buf *dmabuf,
|
|
struct dma_buf_attachment *attach);
|
|
int dma_buf_pin(struct dma_buf_attachment *attach);
|
|
void dma_buf_unpin(struct dma_buf_attachment *attach);
|
|
|
|
struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info);
|
|
|
|
int dma_buf_fd(struct dma_buf *dmabuf, int flags);
|
|
struct dma_buf *dma_buf_get(int fd);
|
|
void dma_buf_put(struct dma_buf *dmabuf);
|
|
|
|
struct sg_table *dma_buf_map_attachment(struct dma_buf_attachment *,
|
|
enum dma_data_direction);
|
|
void dma_buf_unmap_attachment(struct dma_buf_attachment *, struct sg_table *,
|
|
enum dma_data_direction);
|
|
void dma_buf_move_notify(struct dma_buf *dma_buf);
|
|
int dma_buf_begin_cpu_access(struct dma_buf *dma_buf,
|
|
enum dma_data_direction dir);
|
|
int dma_buf_end_cpu_access(struct dma_buf *dma_buf,
|
|
enum dma_data_direction dir);
|
|
|
|
int dma_buf_mmap(struct dma_buf *, struct vm_area_struct *,
|
|
unsigned long);
|
|
int dma_buf_vmap(struct dma_buf *dmabuf, struct dma_buf_map *map);
|
|
void dma_buf_vunmap(struct dma_buf *dmabuf, struct dma_buf_map *map);
|
|
#endif /* __DMA_BUF_H__ */
|