[v2,1/9] dma-buf: move to drivers/dma-buf

Message ID	20140701105708.12718.50675.stgit@patser (mailing list archive)
State	New, archived
Headers	show Return-Path: <dri-devel-bounces@lists.freedesktop.org> Subject: [PATCH v2 1/9] dma-buf: move to drivers/dma-buf To: gregkh@linuxfoundation.org From: Maarten Lankhorst <maarten.lankhorst@canonical.com> Date: Tue, 01 Jul 2014 12:57:08 +0200 Message-ID: <20140701105708.12718.50675.stgit@patser> In-Reply-To: <20140701103432.12718.82795.stgit@patser> References: <20140701103432.12718.82795.stgit@patser> User-Agent: StGit/0.15 MIME-Version: 1.0 Cc: linux-arch@vger.kernel.org, thellstrom@vmware.com, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, ccross@google.com, linux-media@vger.kernel.org Precedence: list Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" <dri-devel-bounces@lists.freedesktop.org>

On 01-07-14 12:57, Maarten Lankhorst wrote: > Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com> It would help to use '-M' option with format-patch for this kind of rework. Regards, Arend > --- > Documentation/DocBook/device-drivers.tmpl | 3 > MAINTAINERS | 4 > drivers/Makefile | 1 > drivers/base/Makefile | 1 > drivers/base/dma-buf.c | 743 ----------------------------- > drivers/base/reservation.c | 39 -- > drivers/dma-buf/Makefile | 1 > drivers/dma-buf/dma-buf.c | 743 +++++++++++++++++++++++++++++ > drivers/dma-buf/reservation.c | 39 ++ > 9 files changed, 787 insertions(+), 787 deletions(-) > delete mode 100644 drivers/base/dma-buf.c > delete mode 100644 drivers/base/reservation.c > create mode 100644 drivers/dma-buf/Makefile > create mode 100644 drivers/dma-buf/dma-buf.c > create mode 100644 drivers/dma-buf/reservation.c > > diff --git a/Documentation/DocBook/device-drivers.tmpl b/Documentation/DocBook/device-drivers.tmpl > index cc63f30de166..ac61ebd92875 100644 > --- a/Documentation/DocBook/device-drivers.tmpl > +++ b/Documentation/DocBook/device-drivers.tmpl > @@ -128,8 +128,7 @@ X!Edrivers/base/interface.c > !Edrivers/base/bus.c > </sect1> > <sect1><title>Device Drivers DMA Management</title> > -!Edrivers/base/dma-buf.c > -!Edrivers/base/reservation.c > +!Edrivers/dma-buf/dma-buf.c > !Iinclude/linux/reservation.h > !Edrivers/base/dma-coherent.c > !Edrivers/base/dma-mapping.c > diff --git a/MAINTAINERS b/MAINTAINERS > index 134483f206e4..c948e53a4ee6 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -2882,8 +2882,8 @@ S: Maintained > L: linux-media@vger.kernel.org > L: dri-devel@lists.freedesktop.org > L: linaro-mm-sig@lists.linaro.org > -F: drivers/base/dma-buf* > -F: include/linux/dma-buf* > +F: drivers/dma-buf/ > +F: include/linux/dma-buf* include/linux/reservation.h > F: Documentation/dma-buf-sharing.txt > T: git git://git.linaro.org/people/sumitsemwal/linux-dma-buf.git > > diff --git a/drivers/Makefile b/drivers/Makefile > index f98b50d8251d..c00337be5351 100644 > --- a/drivers/Makefile > +++ b/drivers/Makefile > @@ -61,6 +61,7 @@ obj-$(CONFIG_FB_INTEL) += video/fbdev/intelfb/ > > obj-$(CONFIG_PARPORT) += parport/ > obj-y += base/ block/ misc/ mfd/ nfc/ > +obj-$(CONFIG_DMA_SHARED_BUFFER) += dma-buf/ > obj-$(CONFIG_NUBUS) += nubus/ > obj-y += macintosh/ > obj-$(CONFIG_IDE) += ide/ > diff --git a/drivers/base/Makefile b/drivers/base/Makefile > index 04b314e0fa51..4aab26ec0292 100644 > --- a/drivers/base/Makefile > +++ b/drivers/base/Makefile > @@ -10,7 +10,6 @@ obj-$(CONFIG_DMA_CMA) += dma-contiguous.o > obj-y += power/ > obj-$(CONFIG_HAS_DMA) += dma-mapping.o > obj-$(CONFIG_HAVE_GENERIC_DMA_COHERENT) += dma-coherent.o > -obj-$(CONFIG_DMA_SHARED_BUFFER) += dma-buf.o reservation.o > obj-$(CONFIG_ISA) += isa.o > obj-$(CONFIG_FW_LOADER) += firmware_class.o > obj-$(CONFIG_NUMA) += node.o > diff --git a/drivers/base/dma-buf.c b/drivers/base/dma-buf.c > deleted file mode 100644 > index 840c7fa80983..000000000000 > --- a/drivers/base/dma-buf.c > +++ /dev/null > @@ -1,743 +0,0 @@ > -/* > - * Framework for buffer objects that can be shared across devices/subsystems. > - * > - * Copyright(C) 2011 Linaro Limited. All rights reserved. > - * Author: Sumit Semwal <sumit.semwal@ti.com> > - * > - * Many thanks to linaro-mm-sig list, and specially > - * Arnd Bergmann <arnd@arndb.de>, Rob Clark <rob@ti.com> and > - * Daniel Vetter <daniel@ffwll.ch> for their support in creation and > - * refining of this idea. > - * > - * This program is free software; you can redistribute it and/or modify it > - * under the terms of the GNU General Public License version 2 as published by > - * the Free Software Foundation. > - * > - * This program is distributed in the hope that it will be useful, but WITHOUT > - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or > - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for > - * more details. > - * > - * You should have received a copy of the GNU General Public License along with > - * this program. If not, see <http://www.gnu.org/licenses/>. > - */ > - > -#include <linux/fs.h> > -#include <linux/slab.h> > -#include <linux/dma-buf.h> > -#include <linux/anon_inodes.h> > -#include <linux/export.h> > -#include <linux/debugfs.h> > -#include <linux/seq_file.h> > - > -static inline int is_dma_buf_file(struct file *); > - > -struct dma_buf_list { > - struct list_head head; > - struct mutex lock; > -}; > - > -static struct dma_buf_list db_list; > - > -static int dma_buf_release(struct inode *inode, struct file *file) > -{ > - struct dma_buf *dmabuf; > - > - if (!is_dma_buf_file(file)) > - return -EINVAL; > - > - dmabuf = file->private_data; > - > - BUG_ON(dmabuf->vmapping_counter); > - > - dmabuf->ops->release(dmabuf); > - > - mutex_lock(&db_list.lock); > - list_del(&dmabuf->list_node); > - mutex_unlock(&db_list.lock); > - > - kfree(dmabuf); > - return 0; > -} > - > -static int dma_buf_mmap_internal(struct file *file, struct vm_area_struct *vma) > -{ > - struct dma_buf *dmabuf; > - > - if (!is_dma_buf_file(file)) > - return -EINVAL; > - > - dmabuf = file->private_data; > - > - /* check for overflowing the buffer's size */ > - if (vma->vm_pgoff + ((vma->vm_end - vma->vm_start) >> PAGE_SHIFT) > > - dmabuf->size >> PAGE_SHIFT) > - return -EINVAL; > - > - return dmabuf->ops->mmap(dmabuf, vma); > -} > - > -static loff_t dma_buf_llseek(struct file *file, loff_t offset, int whence) > -{ > - struct dma_buf *dmabuf; > - loff_t base; > - > - if (!is_dma_buf_file(file)) > - return -EBADF; > - > - dmabuf = file->private_data; > - > - /* only support discovering the end of the buffer, > - but also allow SEEK_SET to maintain the idiomatic > - SEEK_END(0), SEEK_CUR(0) pattern */ > - if (whence == SEEK_END) > - base = dmabuf->size; > - else if (whence == SEEK_SET) > - base = 0; > - else > - return -EINVAL; > - > - if (offset != 0) > - return -EINVAL; > - > - return base + offset; > -} > - > -static const struct file_operations dma_buf_fops = { > - .release = dma_buf_release, > - .mmap = dma_buf_mmap_internal, > - .llseek = dma_buf_llseek, > -}; > - > -/* > - * is_dma_buf_file - Check if struct file* is associated with dma_buf > - */ > -static inline int is_dma_buf_file(struct file *file) > -{ > - return file->f_op == &dma_buf_fops; > -} > - > -/** > - * dma_buf_export_named - Creates a new dma_buf, and associates an anon file > - * with this buffer, so it can be exported. > - * Also connect the allocator specific data and ops to the buffer. > - * Additionally, provide a name string for exporter; useful in debugging. > - * > - * @priv: [in] Attach private data of allocator to this buffer > - * @ops: [in] Attach allocator-defined dma buf ops to the new buffer. > - * @size: [in] Size of the buffer > - * @flags: [in] mode flags for the file. > - * @exp_name: [in] name of the exporting module - useful for debugging. > - * > - * Returns, on success, a newly created dma_buf object, which wraps the > - * supplied private data and operations for dma_buf_ops. On either missing > - * ops, or error in allocating struct dma_buf, will return negative error. > - * > - */ > -struct dma_buf *dma_buf_export_named(void *priv, const struct dma_buf_ops *ops, > - size_t size, int flags, const char *exp_name) > -{ > - struct dma_buf *dmabuf; > - struct file *file; > - > - if (WARN_ON(!priv || !ops > - || !ops->map_dma_buf > - || !ops->unmap_dma_buf > - || !ops->release > - || !ops->kmap_atomic > - || !ops->kmap > - || !ops->mmap)) { > - return ERR_PTR(-EINVAL); > - } > - > - dmabuf = kzalloc(sizeof(struct dma_buf), GFP_KERNEL); > - if (dmabuf == NULL) > - return ERR_PTR(-ENOMEM); > - > - dmabuf->priv = priv; > - dmabuf->ops = ops; > - dmabuf->size = size; > - dmabuf->exp_name = exp_name; > - > - file = anon_inode_getfile("dmabuf", &dma_buf_fops, dmabuf, flags); > - if (IS_ERR(file)) { > - kfree(dmabuf); > - return ERR_CAST(file); > - } > - > - file->f_mode |= FMODE_LSEEK; > - dmabuf->file = file; > - > - mutex_init(&dmabuf->lock); > - INIT_LIST_HEAD(&dmabuf->attachments); > - > - mutex_lock(&db_list.lock); > - list_add(&dmabuf->list_node, &db_list.head); > - mutex_unlock(&db_list.lock); > - > - return dmabuf; > -} > -EXPORT_SYMBOL_GPL(dma_buf_export_named); > - > - > -/** > - * dma_buf_fd - returns a file descriptor for the given dma_buf > - * @dmabuf: [in] pointer to dma_buf for which fd is required. > - * @flags: [in] flags to give to fd > - * > - * On success, returns an associated 'fd'. Else, returns error. > - */ > -int dma_buf_fd(struct dma_buf *dmabuf, int flags) > -{ > - int fd; > - > - if (!dmabuf || !dmabuf->file) > - return -EINVAL; > - > - fd = get_unused_fd_flags(flags); > - if (fd < 0) > - return fd; > - > - fd_install(fd, dmabuf->file); > - > - return fd; > -} > -EXPORT_SYMBOL_GPL(dma_buf_fd); > - > -/** > - * dma_buf_get - returns the dma_buf structure related to an fd > - * @fd: [in] fd associated with the dma_buf to be returned > - * > - * On success, returns the dma_buf structure associated with an fd; uses > - * file's refcounting done by fget to increase refcount. returns ERR_PTR > - * otherwise. > - */ > -struct dma_buf *dma_buf_get(int fd) > -{ > - struct file *file; > - > - file = fget(fd); > - > - if (!file) > - return ERR_PTR(-EBADF); > - > - if (!is_dma_buf_file(file)) { > - fput(file); > - return ERR_PTR(-EINVAL); > - } > - > - return file->private_data; > -} > -EXPORT_SYMBOL_GPL(dma_buf_get); > - > -/** > - * dma_buf_put - decreases refcount of the buffer > - * @dmabuf: [in] buffer to reduce refcount of > - * > - * Uses file's refcounting done implicitly by fput() > - */ > -void dma_buf_put(struct dma_buf *dmabuf) > -{ > - if (WARN_ON(!dmabuf || !dmabuf->file)) > - return; > - > - fput(dmabuf->file); > -} > -EXPORT_SYMBOL_GPL(dma_buf_put); > - > -/** > - * dma_buf_attach - Add the device to dma_buf's attachments list; optionally, > - * calls attach() of dma_buf_ops to allow device-specific attach functionality > - * @dmabuf: [in] buffer to attach device to. > - * @dev: [in] device to be attached. > - * > - * Returns struct dma_buf_attachment * for this attachment; returns ERR_PTR on > - * error. > - */ > -struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf, > - struct device *dev) > -{ > - struct dma_buf_attachment *attach; > - int ret; > - > - if (WARN_ON(!dmabuf || !dev)) > - return ERR_PTR(-EINVAL); > - > - attach = kzalloc(sizeof(struct dma_buf_attachment), GFP_KERNEL); > - if (attach == NULL) > - return ERR_PTR(-ENOMEM); > - > - attach->dev = dev; > - attach->dmabuf = dmabuf; > - > - mutex_lock(&dmabuf->lock); > - > - if (dmabuf->ops->attach) { > - ret = dmabuf->ops->attach(dmabuf, dev, attach); > - if (ret) > - goto err_attach; > - } > - list_add(&attach->node, &dmabuf->attachments); > - > - mutex_unlock(&dmabuf->lock); > - return attach; > - > -err_attach: > - kfree(attach); > - mutex_unlock(&dmabuf->lock); > - return ERR_PTR(ret); > -} > -EXPORT_SYMBOL_GPL(dma_buf_attach); > - > -/** > - * dma_buf_detach - Remove the given attachment from dmabuf's attachments list; > - * optionally calls detach() of dma_buf_ops for device-specific detach > - * @dmabuf: [in] buffer to detach from. > - * @attach: [in] attachment to be detached; is free'd after this call. > - * > - */ > -void dma_buf_detach(struct dma_buf *dmabuf, struct dma_buf_attachment *attach) > -{ > - if (WARN_ON(!dmabuf || !attach)) > - return; > - > - mutex_lock(&dmabuf->lock); > - list_del(&attach->node); > - if (dmabuf->ops->detach) > - dmabuf->ops->detach(dmabuf, attach); > - > - mutex_unlock(&dmabuf->lock); > - kfree(attach); > -} > -EXPORT_SYMBOL_GPL(dma_buf_detach); > - > -/** > - * dma_buf_map_attachment - Returns the scatterlist table of the attachment; > - * mapped into _device_ address space. Is a wrapper for map_dma_buf() of the > - * dma_buf_ops. > - * @attach: [in] attachment whose scatterlist is to be returned > - * @direction: [in] direction of DMA transfer > - * > - * Returns sg_table containing the scatterlist to be returned; returns ERR_PTR > - * on error. > - */ > -struct sg_table *dma_buf_map_attachment(struct dma_buf_attachment *attach, > - enum dma_data_direction direction) > -{ > - struct sg_table *sg_table = ERR_PTR(-EINVAL); > - > - might_sleep(); > - > - if (WARN_ON(!attach || !attach->dmabuf)) > - return ERR_PTR(-EINVAL); > - > - sg_table = attach->dmabuf->ops->map_dma_buf(attach, direction); > - if (!sg_table) > - sg_table = ERR_PTR(-ENOMEM); > - > - return sg_table; > -} > -EXPORT_SYMBOL_GPL(dma_buf_map_attachment); > - > -/** > - * dma_buf_unmap_attachment - unmaps and decreases usecount of the buffer;might > - * deallocate the scatterlist associated. Is a wrapper for unmap_dma_buf() of > - * dma_buf_ops. > - * @attach: [in] attachment to unmap buffer from > - * @sg_table: [in] scatterlist info of the buffer to unmap > - * @direction: [in] direction of DMA transfer > - * > - */ > -void dma_buf_unmap_attachment(struct dma_buf_attachment *attach, > - struct sg_table *sg_table, > - enum dma_data_direction direction) > -{ > - might_sleep(); > - > - if (WARN_ON(!attach || !attach->dmabuf || !sg_table)) > - return; > - > - attach->dmabuf->ops->unmap_dma_buf(attach, sg_table, > - direction); > -} > -EXPORT_SYMBOL_GPL(dma_buf_unmap_attachment); > - > - > -/** > - * dma_buf_begin_cpu_access - Must be called before accessing a dma_buf from the > - * cpu in the kernel context. Calls begin_cpu_access to allow exporter-specific > - * preparations. Coherency is only guaranteed in the specified range for the > - * specified access direction. > - * @dmabuf: [in] buffer to prepare cpu access for. > - * @start: [in] start of range for cpu access. > - * @len: [in] length of range for cpu access. > - * @direction: [in] length of range for cpu access. > - * > - * Can return negative error values, returns 0 on success. > - */ > -int dma_buf_begin_cpu_access(struct dma_buf *dmabuf, size_t start, size_t len, > - enum dma_data_direction direction) > -{ > - int ret = 0; > - > - if (WARN_ON(!dmabuf)) > - return -EINVAL; > - > - if (dmabuf->ops->begin_cpu_access) > - ret = dmabuf->ops->begin_cpu_access(dmabuf, start, len, direction); > - > - return ret; > -} > -EXPORT_SYMBOL_GPL(dma_buf_begin_cpu_access); > - > -/** > - * dma_buf_end_cpu_access - Must be called after accessing a dma_buf from the > - * cpu in the kernel context. Calls end_cpu_access to allow exporter-specific > - * actions. Coherency is only guaranteed in the specified range for the > - * specified access direction. > - * @dmabuf: [in] buffer to complete cpu access for. > - * @start: [in] start of range for cpu access. > - * @len: [in] length of range for cpu access. > - * @direction: [in] length of range for cpu access. > - * > - * This call must always succeed. > - */ > -void dma_buf_end_cpu_access(struct dma_buf *dmabuf, size_t start, size_t len, > - enum dma_data_direction direction) > -{ > - WARN_ON(!dmabuf); > - > - if (dmabuf->ops->end_cpu_access) > - dmabuf->ops->end_cpu_access(dmabuf, start, len, direction); > -} > -EXPORT_SYMBOL_GPL(dma_buf_end_cpu_access); > - > -/** > - * dma_buf_kmap_atomic - Map a page of the buffer object into kernel address > - * space. The same restrictions as for kmap_atomic and friends apply. > - * @dmabuf: [in] buffer to map page from. > - * @page_num: [in] page in PAGE_SIZE units to map. > - * > - * This call must always succeed, any necessary preparations that might fail > - * need to be done in begin_cpu_access. > - */ > -void *dma_buf_kmap_atomic(struct dma_buf *dmabuf, unsigned long page_num) > -{ > - WARN_ON(!dmabuf); > - > - return dmabuf->ops->kmap_atomic(dmabuf, page_num); > -} > -EXPORT_SYMBOL_GPL(dma_buf_kmap_atomic); > - > -/** > - * dma_buf_kunmap_atomic - Unmap a page obtained by dma_buf_kmap_atomic. > - * @dmabuf: [in] buffer to unmap page from. > - * @page_num: [in] page in PAGE_SIZE units to unmap. > - * @vaddr: [in] kernel space pointer obtained from dma_buf_kmap_atomic. > - * > - * This call must always succeed. > - */ > -void dma_buf_kunmap_atomic(struct dma_buf *dmabuf, unsigned long page_num, > - void *vaddr) > -{ > - WARN_ON(!dmabuf); > - > - if (dmabuf->ops->kunmap_atomic) > - dmabuf->ops->kunmap_atomic(dmabuf, page_num, vaddr); > -} > -EXPORT_SYMBOL_GPL(dma_buf_kunmap_atomic); > - > -/** > - * dma_buf_kmap - Map a page of the buffer object into kernel address space. The > - * same restrictions as for kmap and friends apply. > - * @dmabuf: [in] buffer to map page from. > - * @page_num: [in] page in PAGE_SIZE units to map. > - * > - * This call must always succeed, any necessary preparations that might fail > - * need to be done in begin_cpu_access. > - */ > -void *dma_buf_kmap(struct dma_buf *dmabuf, unsigned long page_num) > -{ > - WARN_ON(!dmabuf); > - > - return dmabuf->ops->kmap(dmabuf, page_num); > -} > -EXPORT_SYMBOL_GPL(dma_buf_kmap); > - > -/** > - * dma_buf_kunmap - Unmap a page obtained by dma_buf_kmap. > - * @dmabuf: [in] buffer to unmap page from. > - * @page_num: [in] page in PAGE_SIZE units to unmap. > - * @vaddr: [in] kernel space pointer obtained from dma_buf_kmap. > - * > - * This call must always succeed. > - */ > -void dma_buf_kunmap(struct dma_buf *dmabuf, unsigned long page_num, > - void *vaddr) > -{ > - WARN_ON(!dmabuf); > - > - if (dmabuf->ops->kunmap) > - dmabuf->ops->kunmap(dmabuf, page_num, vaddr); > -} > -EXPORT_SYMBOL_GPL(dma_buf_kunmap); > - > - > -/** > - * dma_buf_mmap - Setup up a userspace mmap with the given vma > - * @dmabuf: [in] buffer that should back the vma > - * @vma: [in] vma for the mmap > - * @pgoff: [in] offset in pages where this mmap should start within the > - * dma-buf buffer. > - * > - * This function adjusts the passed in vma so that it points at the file of the > - * dma_buf operation. It also adjusts the starting pgoff and does bounds > - * checking on the size of the vma. Then it calls the exporters mmap function to > - * set up the mapping. > - * > - * Can return negative error values, returns 0 on success. > - */ > -int dma_buf_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma, > - unsigned long pgoff) > -{ > - struct file *oldfile; > - int ret; > - > - if (WARN_ON(!dmabuf || !vma)) > - return -EINVAL; > - > - /* check for offset overflow */ > - if (pgoff + ((vma->vm_end - vma->vm_start) >> PAGE_SHIFT) < pgoff) > - return -EOVERFLOW; > - > - /* check for overflowing the buffer's size */ > - if (pgoff + ((vma->vm_end - vma->vm_start) >> PAGE_SHIFT) > > - dmabuf->size >> PAGE_SHIFT) > - return -EINVAL; > - > - /* readjust the vma */ > - get_file(dmabuf->file); > - oldfile = vma->vm_file; > - vma->vm_file = dmabuf->file; > - vma->vm_pgoff = pgoff; > - > - ret = dmabuf->ops->mmap(dmabuf, vma); > - if (ret) { > - /* restore old parameters on failure */ > - vma->vm_file = oldfile; > - fput(dmabuf->file); > - } else { > - if (oldfile) > - fput(oldfile); > - } > - return ret; > - > -} > -EXPORT_SYMBOL_GPL(dma_buf_mmap); > - > -/** > - * dma_buf_vmap - Create virtual mapping for the buffer object into kernel > - * address space. Same restrictions as for vmap and friends apply. > - * @dmabuf: [in] buffer to vmap > - * > - * This call may fail due to lack of virtual mapping address space. > - * These calls are optional in drivers. The intended use for them > - * is for mapping objects linear in kernel space for high use objects. > - * Please attempt to use kmap/kunmap before thinking about these interfaces. > - * > - * Returns NULL on error. > - */ > -void *dma_buf_vmap(struct dma_buf *dmabuf) > -{ > - void *ptr; > - > - if (WARN_ON(!dmabuf)) > - return NULL; > - > - if (!dmabuf->ops->vmap) > - return NULL; > - > - mutex_lock(&dmabuf->lock); > - if (dmabuf->vmapping_counter) { > - dmabuf->vmapping_counter++; > - BUG_ON(!dmabuf->vmap_ptr); > - ptr = dmabuf->vmap_ptr; > - goto out_unlock; > - } > - > - BUG_ON(dmabuf->vmap_ptr); > - > - ptr = dmabuf->ops->vmap(dmabuf); > - if (WARN_ON_ONCE(IS_ERR(ptr))) > - ptr = NULL; > - if (!ptr) > - goto out_unlock; > - > - dmabuf->vmap_ptr = ptr; > - dmabuf->vmapping_counter = 1; > - > -out_unlock: > - mutex_unlock(&dmabuf->lock); > - return ptr; > -} > -EXPORT_SYMBOL_GPL(dma_buf_vmap); > - > -/** > - * dma_buf_vunmap - Unmap a vmap obtained by dma_buf_vmap. > - * @dmabuf: [in] buffer to vunmap > - * @vaddr: [in] vmap to vunmap > - */ > -void dma_buf_vunmap(struct dma_buf *dmabuf, void *vaddr) > -{ > - if (WARN_ON(!dmabuf)) > - return; > - > - BUG_ON(!dmabuf->vmap_ptr); > - BUG_ON(dmabuf->vmapping_counter == 0); > - BUG_ON(dmabuf->vmap_ptr != vaddr); > - > - mutex_lock(&dmabuf->lock); > - if (--dmabuf->vmapping_counter == 0) { > - if (dmabuf->ops->vunmap) > - dmabuf->ops->vunmap(dmabuf, vaddr); > - dmabuf->vmap_ptr = NULL; > - } > - mutex_unlock(&dmabuf->lock); > -} > -EXPORT_SYMBOL_GPL(dma_buf_vunmap); > - > -#ifdef CONFIG_DEBUG_FS > -static int dma_buf_describe(struct seq_file *s) > -{ > - int ret; > - struct dma_buf *buf_obj; > - struct dma_buf_attachment *attach_obj; > - int count = 0, attach_count; > - size_t size = 0; > - > - ret = mutex_lock_interruptible(&db_list.lock); > - > - if (ret) > - return ret; > - > - seq_puts(s, "\nDma-buf Objects:\n"); > - seq_puts(s, "size\tflags\tmode\tcount\texp_name\n"); > - > - list_for_each_entry(buf_obj, &db_list.head, list_node) { > - ret = mutex_lock_interruptible(&buf_obj->lock); > - > - if (ret) { > - seq_puts(s, > - "\tERROR locking buffer object: skipping\n"); > - continue; > - } > - > - seq_printf(s, "%08zu\t%08x\t%08x\t%08ld\t%s\n", > - buf_obj->size, > - buf_obj->file->f_flags, buf_obj->file->f_mode, > - (long)(buf_obj->file->f_count.counter), > - buf_obj->exp_name); > - > - seq_puts(s, "\tAttached Devices:\n"); > - attach_count = 0; > - > - list_for_each_entry(attach_obj, &buf_obj->attachments, node) { > - seq_puts(s, "\t"); > - > - seq_printf(s, "%s\n", dev_name(attach_obj->dev)); > - attach_count++; > - } > - > - seq_printf(s, "Total %d devices attached\n\n", > - attach_count); > - > - count++; > - size += buf_obj->size; > - mutex_unlock(&buf_obj->lock); > - } > - > - seq_printf(s, "\nTotal %d objects, %zu bytes\n", count, size); > - > - mutex_unlock(&db_list.lock); > - return 0; > -} > - > -static int dma_buf_show(struct seq_file *s, void *unused) > -{ > - void (*func)(struct seq_file *) = s->private; > - func(s); > - return 0; > -} > - > -static int dma_buf_debug_open(struct inode *inode, struct file *file) > -{ > - return single_open(file, dma_buf_show, inode->i_private); > -} > - > -static const struct file_operations dma_buf_debug_fops = { > - .open = dma_buf_debug_open, > - .read = seq_read, > - .llseek = seq_lseek, > - .release = single_release, > -}; > - > -static struct dentry *dma_buf_debugfs_dir; > - > -static int dma_buf_init_debugfs(void) > -{ > - int err = 0; > - dma_buf_debugfs_dir = debugfs_create_dir("dma_buf", NULL); > - if (IS_ERR(dma_buf_debugfs_dir)) { > - err = PTR_ERR(dma_buf_debugfs_dir); > - dma_buf_debugfs_dir = NULL; > - return err; > - } > - > - err = dma_buf_debugfs_create_file("bufinfo", dma_buf_describe); > - > - if (err) > - pr_debug("dma_buf: debugfs: failed to create node bufinfo\n"); > - > - return err; > -} > - > -static void dma_buf_uninit_debugfs(void) > -{ > - if (dma_buf_debugfs_dir) > - debugfs_remove_recursive(dma_buf_debugfs_dir); > -} > - > -int dma_buf_debugfs_create_file(const char *name, > - int (*write)(struct seq_file *)) > -{ > - struct dentry *d; > - > - d = debugfs_create_file(name, S_IRUGO, dma_buf_debugfs_dir, > - write, &dma_buf_debug_fops); > - > - return PTR_ERR_OR_ZERO(d); > -} > -#else > -static inline int dma_buf_init_debugfs(void) > -{ > - return 0; > -} > -static inline void dma_buf_uninit_debugfs(void) > -{ > -} > -#endif > - > -static int __init dma_buf_init(void) > -{ > - mutex_init(&db_list.lock); > - INIT_LIST_HEAD(&db_list.head); > - dma_buf_init_debugfs(); > - return 0; > -} > -subsys_initcall(dma_buf_init); > - > -static void __exit dma_buf_deinit(void) > -{ > - dma_buf_uninit_debugfs(); > -} > -__exitcall(dma_buf_deinit); > diff --git a/drivers/base/reservation.c b/drivers/base/reservation.c > deleted file mode 100644 > index a73fbf3b8e56..000000000000 > --- a/drivers/base/reservation.c > +++ /dev/null > @@ -1,39 +0,0 @@ > -/* > - * Copyright (C) 2012-2013 Canonical Ltd > - * > - * Based on bo.c which bears the following copyright notice, > - * but is dual licensed: > - * > - * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA > - * All Rights Reserved. > - * > - * Permission is hereby granted, free of charge, to any person obtaining a > - * copy of this software and associated documentation files (the > - * "Software"), to deal in the Software without restriction, including > - * without limitation the rights to use, copy, modify, merge, publish, > - * distribute, sub license, and/or sell copies of the Software, and to > - * permit persons to whom the Software is furnished to do so, subject to > - * the following conditions: > - * > - * The above copyright notice and this permission notice (including the > - * next paragraph) shall be included in all copies or substantial portions > - * of the Software. > - * > - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR > - * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, > - * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL > - * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, > - * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR > - * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE > - * USE OR OTHER DEALINGS IN THE SOFTWARE. > - * > - **************************************************************************/ > -/* > - * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com> > - */ > - > -#include <linux/reservation.h> > -#include <linux/export.h> > - > -DEFINE_WW_CLASS(reservation_ww_class); > -EXPORT_SYMBOL(reservation_ww_class); > diff --git a/drivers/dma-buf/Makefile b/drivers/dma-buf/Makefile > new file mode 100644 > index 000000000000..4a4f4c9bacd0 > --- /dev/null > +++ b/drivers/dma-buf/Makefile > @@ -0,0 +1 @@ > +obj-y := dma-buf.o reservation.o > diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c > new file mode 100644 > index 000000000000..840c7fa80983 > --- /dev/null > +++ b/drivers/dma-buf/dma-buf.c > @@ -0,0 +1,743 @@ > +/* > + * Framework for buffer objects that can be shared across devices/subsystems. > + * > + * Copyright(C) 2011 Linaro Limited. All rights reserved. > + * Author: Sumit Semwal <sumit.semwal@ti.com> > + * > + * Many thanks to linaro-mm-sig list, and specially > + * Arnd Bergmann <arnd@arndb.de>, Rob Clark <rob@ti.com> and > + * Daniel Vetter <daniel@ffwll.ch> for their support in creation and > + * refining of this idea. > + * > + * This program is free software; you can redistribute it and/or modify it > + * under the terms of the GNU General Public License version 2 as published by > + * the Free Software Foundation. > + * > + * This program is distributed in the hope that it will be useful, but WITHOUT > + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or > + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for > + * more details. > + * > + * You should have received a copy of the GNU General Public License along with > + * this program. If not, see <http://www.gnu.org/licenses/>. > + */ > + > +#include <linux/fs.h> > +#include <linux/slab.h> > +#include <linux/dma-buf.h> > +#include <linux/anon_inodes.h> > +#include <linux/export.h> > +#include <linux/debugfs.h> > +#include <linux/seq_file.h> > + > +static inline int is_dma_buf_file(struct file *); > + > +struct dma_buf_list { > + struct list_head head; > + struct mutex lock; > +}; > + > +static struct dma_buf_list db_list; > + > +static int dma_buf_release(struct inode *inode, struct file *file) > +{ > + struct dma_buf *dmabuf; > + > + if (!is_dma_buf_file(file)) > + return -EINVAL; > + > + dmabuf = file->private_data; > + > + BUG_ON(dmabuf->vmapping_counter); > + > + dmabuf->ops->release(dmabuf); > + > + mutex_lock(&db_list.lock); > + list_del(&dmabuf->list_node); > + mutex_unlock(&db_list.lock); > + > + kfree(dmabuf); > + return 0; > +} > + > +static int dma_buf_mmap_internal(struct file *file, struct vm_area_struct *vma) > +{ > + struct dma_buf *dmabuf; > + > + if (!is_dma_buf_file(file)) > + return -EINVAL; > + > + dmabuf = file->private_data; > + > + /* check for overflowing the buffer's size */ > + if (vma->vm_pgoff + ((vma->vm_end - vma->vm_start) >> PAGE_SHIFT) > > + dmabuf->size >> PAGE_SHIFT) > + return -EINVAL; > + > + return dmabuf->ops->mmap(dmabuf, vma); > +} > + > +static loff_t dma_buf_llseek(struct file *file, loff_t offset, int whence) > +{ > + struct dma_buf *dmabuf; > + loff_t base; > + > + if (!is_dma_buf_file(file)) > + return -EBADF; > + > + dmabuf = file->private_data; > + > + /* only support discovering the end of the buffer, > + but also allow SEEK_SET to maintain the idiomatic > + SEEK_END(0), SEEK_CUR(0) pattern */ > + if (whence == SEEK_END) > + base = dmabuf->size; > + else if (whence == SEEK_SET) > + base = 0; > + else > + return -EINVAL; > + > + if (offset != 0) > + return -EINVAL; > + > + return base + offset; > +} > + > +static const struct file_operations dma_buf_fops = { > + .release = dma_buf_release, > + .mmap = dma_buf_mmap_internal, > + .llseek = dma_buf_llseek, > +}; > + > +/* > + * is_dma_buf_file - Check if struct file* is associated with dma_buf > + */ > +static inline int is_dma_buf_file(struct file *file) > +{ > + return file->f_op == &dma_buf_fops; > +} > + > +/** > + * dma_buf_export_named - Creates a new dma_buf, and associates an anon file > + * with this buffer, so it can be exported. > + * Also connect the allocator specific data and ops to the buffer. > + * Additionally, provide a name string for exporter; useful in debugging. > + * > + * @priv: [in] Attach private data of allocator to this buffer > + * @ops: [in] Attach allocator-defined dma buf ops to the new buffer. > + * @size: [in] Size of the buffer > + * @flags: [in] mode flags for the file. > + * @exp_name: [in] name of the exporting module - useful for debugging. > + * > + * Returns, on success, a newly created dma_buf object, which wraps the > + * supplied private data and operations for dma_buf_ops. On either missing > + * ops, or error in allocating struct dma_buf, will return negative error. > + * > + */ > +struct dma_buf *dma_buf_export_named(void *priv, const struct dma_buf_ops *ops, > + size_t size, int flags, const char *exp_name) > +{ > + struct dma_buf *dmabuf; > + struct file *file; > + > + if (WARN_ON(!priv || !ops > + || !ops->map_dma_buf > + || !ops->unmap_dma_buf > + || !ops->release > + || !ops->kmap_atomic > + || !ops->kmap > + || !ops->mmap)) { > + return ERR_PTR(-EINVAL); > + } > + > + dmabuf = kzalloc(sizeof(struct dma_buf), GFP_KERNEL); > + if (dmabuf == NULL) > + return ERR_PTR(-ENOMEM); > + > + dmabuf->priv = priv; > + dmabuf->ops = ops; > + dmabuf->size = size; > + dmabuf->exp_name = exp_name; > + > + file = anon_inode_getfile("dmabuf", &dma_buf_fops, dmabuf, flags); > + if (IS_ERR(file)) { > + kfree(dmabuf); > + return ERR_CAST(file); > + } > + > + file->f_mode |= FMODE_LSEEK; > + dmabuf->file = file; > + > + mutex_init(&dmabuf->lock); > + INIT_LIST_HEAD(&dmabuf->attachments); > + > + mutex_lock(&db_list.lock); > + list_add(&dmabuf->list_node, &db_list.head); > + mutex_unlock(&db_list.lock); > + > + return dmabuf; > +} > +EXPORT_SYMBOL_GPL(dma_buf_export_named); > + > + > +/** > + * dma_buf_fd - returns a file descriptor for the given dma_buf > + * @dmabuf: [in] pointer to dma_buf for which fd is required. > + * @flags: [in] flags to give to fd > + * > + * On success, returns an associated 'fd'. Else, returns error. > + */ > +int dma_buf_fd(struct dma_buf *dmabuf, int flags) > +{ > + int fd; > + > + if (!dmabuf || !dmabuf->file) > + return -EINVAL; > + > + fd = get_unused_fd_flags(flags); > + if (fd < 0) > + return fd; > + > + fd_install(fd, dmabuf->file); > + > + return fd; > +} > +EXPORT_SYMBOL_GPL(dma_buf_fd); > + > +/** > + * dma_buf_get - returns the dma_buf structure related to an fd > + * @fd: [in] fd associated with the dma_buf to be returned > + * > + * On success, returns the dma_buf structure associated with an fd; uses > + * file's refcounting done by fget to increase refcount. returns ERR_PTR > + * otherwise. > + */ > +struct dma_buf *dma_buf_get(int fd) > +{ > + struct file *file; > + > + file = fget(fd); > + > + if (!file) > + return ERR_PTR(-EBADF); > + > + if (!is_dma_buf_file(file)) { > + fput(file); > + return ERR_PTR(-EINVAL); > + } > + > + return file->private_data; > +} > +EXPORT_SYMBOL_GPL(dma_buf_get); > + > +/** > + * dma_buf_put - decreases refcount of the buffer > + * @dmabuf: [in] buffer to reduce refcount of > + * > + * Uses file's refcounting done implicitly by fput() > + */ > +void dma_buf_put(struct dma_buf *dmabuf) > +{ > + if (WARN_ON(!dmabuf || !dmabuf->file)) > + return; > + > + fput(dmabuf->file); > +} > +EXPORT_SYMBOL_GPL(dma_buf_put); > + > +/** > + * dma_buf_attach - Add the device to dma_buf's attachments list; optionally, > + * calls attach() of dma_buf_ops to allow device-specific attach functionality > + * @dmabuf: [in] buffer to attach device to. > + * @dev: [in] device to be attached. > + * > + * Returns struct dma_buf_attachment * for this attachment; returns ERR_PTR on > + * error. > + */ > +struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf, > + struct device *dev) > +{ > + struct dma_buf_attachment *attach; > + int ret; > + > + if (WARN_ON(!dmabuf || !dev)) > + return ERR_PTR(-EINVAL); > + > + attach = kzalloc(sizeof(struct dma_buf_attachment), GFP_KERNEL); > + if (attach == NULL) > + return ERR_PTR(-ENOMEM); > + > + attach->dev = dev; > + attach->dmabuf = dmabuf; > + > + mutex_lock(&dmabuf->lock); > + > + if (dmabuf->ops->attach) { > + ret = dmabuf->ops->attach(dmabuf, dev, attach); > + if (ret) > + goto err_attach; > + } > + list_add(&attach->node, &dmabuf->attachments); > + > + mutex_unlock(&dmabuf->lock); > + return attach; > + > +err_attach: > + kfree(attach); > + mutex_unlock(&dmabuf->lock); > + return ERR_PTR(ret); > +} > +EXPORT_SYMBOL_GPL(dma_buf_attach); > + > +/** > + * dma_buf_detach - Remove the given attachment from dmabuf's attachments list; > + * optionally calls detach() of dma_buf_ops for device-specific detach > + * @dmabuf: [in] buffer to detach from. > + * @attach: [in] attachment to be detached; is free'd after this call. > + * > + */ > +void dma_buf_detach(struct dma_buf *dmabuf, struct dma_buf_attachment *attach) > +{ > + if (WARN_ON(!dmabuf || !attach)) > + return; > + > + mutex_lock(&dmabuf->lock); > + list_del(&attach->node); > + if (dmabuf->ops->detach) > + dmabuf->ops->detach(dmabuf, attach); > + > + mutex_unlock(&dmabuf->lock); > + kfree(attach); > +} > +EXPORT_SYMBOL_GPL(dma_buf_detach); > + > +/** > + * dma_buf_map_attachment - Returns the scatterlist table of the attachment; > + * mapped into _device_ address space. Is a wrapper for map_dma_buf() of the > + * dma_buf_ops. > + * @attach: [in] attachment whose scatterlist is to be returned > + * @direction: [in] direction of DMA transfer > + * > + * Returns sg_table containing the scatterlist to be returned; returns ERR_PTR > + * on error. > + */ > +struct sg_table *dma_buf_map_attachment(struct dma_buf_attachment *attach, > + enum dma_data_direction direction) > +{ > + struct sg_table *sg_table = ERR_PTR(-EINVAL); > + > + might_sleep(); > + > + if (WARN_ON(!attach || !attach->dmabuf)) > + return ERR_PTR(-EINVAL); > + > + sg_table = attach->dmabuf->ops->map_dma_buf(attach, direction); > + if (!sg_table) > + sg_table = ERR_PTR(-ENOMEM); > + > + return sg_table; > +} > +EXPORT_SYMBOL_GPL(dma_buf_map_attachment); > + > +/** > + * dma_buf_unmap_attachment - unmaps and decreases usecount of the buffer;might > + * deallocate the scatterlist associated. Is a wrapper for unmap_dma_buf() of > + * dma_buf_ops. > + * @attach: [in] attachment to unmap buffer from > + * @sg_table: [in] scatterlist info of the buffer to unmap > + * @direction: [in] direction of DMA transfer > + * > + */ > +void dma_buf_unmap_attachment(struct dma_buf_attachment *attach, > + struct sg_table *sg_table, > + enum dma_data_direction direction) > +{ > + might_sleep(); > + > + if (WARN_ON(!attach || !attach->dmabuf || !sg_table)) > + return; > + > + attach->dmabuf->ops->unmap_dma_buf(attach, sg_table, > + direction); > +} > +EXPORT_SYMBOL_GPL(dma_buf_unmap_attachment); > + > + > +/** > + * dma_buf_begin_cpu_access - Must be called before accessing a dma_buf from the > + * cpu in the kernel context. Calls begin_cpu_access to allow exporter-specific > + * preparations. Coherency is only guaranteed in the specified range for the > + * specified access direction. > + * @dmabuf: [in] buffer to prepare cpu access for. > + * @start: [in] start of range for cpu access. > + * @len: [in] length of range for cpu access. > + * @direction: [in] length of range for cpu access. > + * > + * Can return negative error values, returns 0 on success. > + */ > +int dma_buf_begin_cpu_access(struct dma_buf *dmabuf, size_t start, size_t len, > + enum dma_data_direction direction) > +{ > + int ret = 0; > + > + if (WARN_ON(!dmabuf)) > + return -EINVAL; > + > + if (dmabuf->ops->begin_cpu_access) > + ret = dmabuf->ops->begin_cpu_access(dmabuf, start, len, direction); > + > + return ret; > +} > +EXPORT_SYMBOL_GPL(dma_buf_begin_cpu_access); > + > +/** > + * dma_buf_end_cpu_access - Must be called after accessing a dma_buf from the > + * cpu in the kernel context. Calls end_cpu_access to allow exporter-specific > + * actions. Coherency is only guaranteed in the specified range for the > + * specified access direction. > + * @dmabuf: [in] buffer to complete cpu access for. > + * @start: [in] start of range for cpu access. > + * @len: [in] length of range for cpu access. > + * @direction: [in] length of range for cpu access. > + * > + * This call must always succeed. > + */ > +void dma_buf_end_cpu_access(struct dma_buf *dmabuf, size_t start, size_t len, > + enum dma_data_direction direction) > +{ > + WARN_ON(!dmabuf); > + > + if (dmabuf->ops->end_cpu_access) > + dmabuf->ops->end_cpu_access(dmabuf, start, len, direction); > +} > +EXPORT_SYMBOL_GPL(dma_buf_end_cpu_access); > + > +/** > + * dma_buf_kmap_atomic - Map a page of the buffer object into kernel address > + * space. The same restrictions as for kmap_atomic and friends apply. > + * @dmabuf: [in] buffer to map page from. > + * @page_num: [in] page in PAGE_SIZE units to map. > + * > + * This call must always succeed, any necessary preparations that might fail > + * need to be done in begin_cpu_access. > + */ > +void *dma_buf_kmap_atomic(struct dma_buf *dmabuf, unsigned long page_num) > +{ > + WARN_ON(!dmabuf); > + > + return dmabuf->ops->kmap_atomic(dmabuf, page_num); > +} > +EXPORT_SYMBOL_GPL(dma_buf_kmap_atomic); > + > +/** > + * dma_buf_kunmap_atomic - Unmap a page obtained by dma_buf_kmap_atomic. > + * @dmabuf: [in] buffer to unmap page from. > + * @page_num: [in] page in PAGE_SIZE units to unmap. > + * @vaddr: [in] kernel space pointer obtained from dma_buf_kmap_atomic. > + * > + * This call must always succeed. > + */ > +void dma_buf_kunmap_atomic(struct dma_buf *dmabuf, unsigned long page_num, > + void *vaddr) > +{ > + WARN_ON(!dmabuf); > + > + if (dmabuf->ops->kunmap_atomic) > + dmabuf->ops->kunmap_atomic(dmabuf, page_num, vaddr); > +} > +EXPORT_SYMBOL_GPL(dma_buf_kunmap_atomic); > + > +/** > + * dma_buf_kmap - Map a page of the buffer object into kernel address space. The > + * same restrictions as for kmap and friends apply. > + * @dmabuf: [in] buffer to map page from. > + * @page_num: [in] page in PAGE_SIZE units to map. > + * > + * This call must always succeed, any necessary preparations that might fail > + * need to be done in begin_cpu_access. > + */ > +void *dma_buf_kmap(struct dma_buf *dmabuf, unsigned long page_num) > +{ > + WARN_ON(!dmabuf); > + > + return dmabuf->ops->kmap(dmabuf, page_num); > +} > +EXPORT_SYMBOL_GPL(dma_buf_kmap); > + > +/** > + * dma_buf_kunmap - Unmap a page obtained by dma_buf_kmap. > + * @dmabuf: [in] buffer to unmap page from. > + * @page_num: [in] page in PAGE_SIZE units to unmap. > + * @vaddr: [in] kernel space pointer obtained from dma_buf_kmap. > + * > + * This call must always succeed. > + */ > +void dma_buf_kunmap(struct dma_buf *dmabuf, unsigned long page_num, > + void *vaddr) > +{ > + WARN_ON(!dmabuf); > + > + if (dmabuf->ops->kunmap) > + dmabuf->ops->kunmap(dmabuf, page_num, vaddr); > +} > +EXPORT_SYMBOL_GPL(dma_buf_kunmap); > + > + > +/** > + * dma_buf_mmap - Setup up a userspace mmap with the given vma > + * @dmabuf: [in] buffer that should back the vma > + * @vma: [in] vma for the mmap > + * @pgoff: [in] offset in pages where this mmap should start within the > + * dma-buf buffer. > + * > + * This function adjusts the passed in vma so that it points at the file of the > + * dma_buf operation. It also adjusts the starting pgoff and does bounds > + * checking on the size of the vma. Then it calls the exporters mmap function to > + * set up the mapping. > + * > + * Can return negative error values, returns 0 on success. > + */ > +int dma_buf_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma, > + unsigned long pgoff) > +{ > + struct file *oldfile; > + int ret; > + > + if (WARN_ON(!dmabuf || !vma)) > + return -EINVAL; > + > + /* check for offset overflow */ > + if (pgoff + ((vma->vm_end - vma->vm_start) >> PAGE_SHIFT) < pgoff) > + return -EOVERFLOW; > + > + /* check for overflowing the buffer's size */ > + if (pgoff + ((vma->vm_end - vma->vm_start) >> PAGE_SHIFT) > > + dmabuf->size >> PAGE_SHIFT) > + return -EINVAL; > + > + /* readjust the vma */ > + get_file(dmabuf->file); > + oldfile = vma->vm_file; > + vma->vm_file = dmabuf->file; > + vma->vm_pgoff = pgoff; > + > + ret = dmabuf->ops->mmap(dmabuf, vma); > + if (ret) { > + /* restore old parameters on failure */ > + vma->vm_file = oldfile; > + fput(dmabuf->file); > + } else { > + if (oldfile) > + fput(oldfile); > + } > + return ret; > + > +} > +EXPORT_SYMBOL_GPL(dma_buf_mmap); > + > +/** > + * dma_buf_vmap - Create virtual mapping for the buffer object into kernel > + * address space. Same restrictions as for vmap and friends apply. > + * @dmabuf: [in] buffer to vmap > + * > + * This call may fail due to lack of virtual mapping address space. > + * These calls are optional in drivers. The intended use for them > + * is for mapping objects linear in kernel space for high use objects. > + * Please attempt to use kmap/kunmap before thinking about these interfaces. > + * > + * Returns NULL on error. > + */ > +void *dma_buf_vmap(struct dma_buf *dmabuf) > +{ > + void *ptr; > + > + if (WARN_ON(!dmabuf)) > + return NULL; > + > + if (!dmabuf->ops->vmap) > + return NULL; > + > + mutex_lock(&dmabuf->lock); > + if (dmabuf->vmapping_counter) { > + dmabuf->vmapping_counter++; > + BUG_ON(!dmabuf->vmap_ptr); > + ptr = dmabuf->vmap_ptr; > + goto out_unlock; > + } > + > + BUG_ON(dmabuf->vmap_ptr); > + > + ptr = dmabuf->ops->vmap(dmabuf); > + if (WARN_ON_ONCE(IS_ERR(ptr))) > + ptr = NULL; > + if (!ptr) > + goto out_unlock; > + > + dmabuf->vmap_ptr = ptr; > + dmabuf->vmapping_counter = 1; > + > +out_unlock: > + mutex_unlock(&dmabuf->lock); > + return ptr; > +} > +EXPORT_SYMBOL_GPL(dma_buf_vmap); > + > +/** > + * dma_buf_vunmap - Unmap a vmap obtained by dma_buf_vmap. > + * @dmabuf: [in] buffer to vunmap > + * @vaddr: [in] vmap to vunmap > + */ > +void dma_buf_vunmap(struct dma_buf *dmabuf, void *vaddr) > +{ > + if (WARN_ON(!dmabuf)) > + return; > + > + BUG_ON(!dmabuf->vmap_ptr); > + BUG_ON(dmabuf->vmapping_counter == 0); > + BUG_ON(dmabuf->vmap_ptr != vaddr); > + > + mutex_lock(&dmabuf->lock); > + if (--dmabuf->vmapping_counter == 0) { > + if (dmabuf->ops->vunmap) > + dmabuf->ops->vunmap(dmabuf, vaddr); > + dmabuf->vmap_ptr = NULL; > + } > + mutex_unlock(&dmabuf->lock); > +} > +EXPORT_SYMBOL_GPL(dma_buf_vunmap); > + > +#ifdef CONFIG_DEBUG_FS > +static int dma_buf_describe(struct seq_file *s) > +{ > + int ret; > + struct dma_buf *buf_obj; > + struct dma_buf_attachment *attach_obj; > + int count = 0, attach_count; > + size_t size = 0; > + > + ret = mutex_lock_interruptible(&db_list.lock); > + > + if (ret) > + return ret; > + > + seq_puts(s, "\nDma-buf Objects:\n"); > + seq_puts(s, "size\tflags\tmode\tcount\texp_name\n"); > + > + list_for_each_entry(buf_obj, &db_list.head, list_node) { > + ret = mutex_lock_interruptible(&buf_obj->lock); > + > + if (ret) { > + seq_puts(s, > + "\tERROR locking buffer object: skipping\n"); > + continue; > + } > + > + seq_printf(s, "%08zu\t%08x\t%08x\t%08ld\t%s\n", > + buf_obj->size, > + buf_obj->file->f_flags, buf_obj->file->f_mode, > + (long)(buf_obj->file->f_count.counter), > + buf_obj->exp_name); > + > + seq_puts(s, "\tAttached Devices:\n"); > + attach_count = 0; > + > + list_for_each_entry(attach_obj, &buf_obj->attachments, node) { > + seq_puts(s, "\t"); > + > + seq_printf(s, "%s\n", dev_name(attach_obj->dev)); > + attach_count++; > + } > + > + seq_printf(s, "Total %d devices attached\n\n", > + attach_count); > + > + count++; > + size += buf_obj->size; > + mutex_unlock(&buf_obj->lock); > + } > + > + seq_printf(s, "\nTotal %d objects, %zu bytes\n", count, size); > + > + mutex_unlock(&db_list.lock); > + return 0; > +} > + > +static int dma_buf_show(struct seq_file *s, void *unused) > +{ > + void (*func)(struct seq_file *) = s->private; > + func(s); > + return 0; > +} > + > +static int dma_buf_debug_open(struct inode *inode, struct file *file) > +{ > + return single_open(file, dma_buf_show, inode->i_private); > +} > + > +static const struct file_operations dma_buf_debug_fops = { > + .open = dma_buf_debug_open, > + .read = seq_read, > + .llseek = seq_lseek, > + .release = single_release, > +}; > + > +static struct dentry *dma_buf_debugfs_dir; > + > +static int dma_buf_init_debugfs(void) > +{ > + int err = 0; > + dma_buf_debugfs_dir = debugfs_create_dir("dma_buf", NULL); > + if (IS_ERR(dma_buf_debugfs_dir)) { > + err = PTR_ERR(dma_buf_debugfs_dir); > + dma_buf_debugfs_dir = NULL; > + return err; > + } > + > + err = dma_buf_debugfs_create_file("bufinfo", dma_buf_describe); > + > + if (err) > + pr_debug("dma_buf: debugfs: failed to create node bufinfo\n"); > + > + return err; > +} > + > +static void dma_buf_uninit_debugfs(void) > +{ > + if (dma_buf_debugfs_dir) > + debugfs_remove_recursive(dma_buf_debugfs_dir); > +} > + > +int dma_buf_debugfs_create_file(const char *name, > + int (*write)(struct seq_file *)) > +{ > + struct dentry *d; > + > + d = debugfs_create_file(name, S_IRUGO, dma_buf_debugfs_dir, > + write, &dma_buf_debug_fops); > + > + return PTR_ERR_OR_ZERO(d); > +} > +#else > +static inline int dma_buf_init_debugfs(void) > +{ > + return 0; > +} > +static inline void dma_buf_uninit_debugfs(void) > +{ > +} > +#endif > + > +static int __init dma_buf_init(void) > +{ > + mutex_init(&db_list.lock); > + INIT_LIST_HEAD(&db_list.head); > + dma_buf_init_debugfs(); > + return 0; > +} > +subsys_initcall(dma_buf_init); > + > +static void __exit dma_buf_deinit(void) > +{ > + dma_buf_uninit_debugfs(); > +} > +__exitcall(dma_buf_deinit); > diff --git a/drivers/dma-buf/reservation.c b/drivers/dma-buf/reservation.c > new file mode 100644 > index 000000000000..a73fbf3b8e56 > --- /dev/null > +++ b/drivers/dma-buf/reservation.c > @@ -0,0 +1,39 @@ > +/* > + * Copyright (C) 2012-2013 Canonical Ltd > + * > + * Based on bo.c which bears the following copyright notice, > + * but is dual licensed: > + * > + * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA > + * All Rights Reserved. > + * > + * Permission is hereby granted, free of charge, to any person obtaining a > + * copy of this software and associated documentation files (the > + * "Software"), to deal in the Software without restriction, including > + * without limitation the rights to use, copy, modify, merge, publish, > + * distribute, sub license, and/or sell copies of the Software, and to > + * permit persons to whom the Software is furnished to do so, subject to > + * the following conditions: > + * > + * The above copyright notice and this permission notice (including the > + * next paragraph) shall be included in all copies or substantial portions > + * of the Software. > + * > + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR > + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, > + * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL > + * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, > + * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR > + * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE > + * USE OR OTHER DEALINGS IN THE SOFTWARE. > + * > + **************************************************************************/ > +/* > + * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com> > + */ > + > +#include <linux/reservation.h> > +#include <linux/export.h> > + > +DEFINE_WW_CLASS(reservation_ww_class); > +EXPORT_SYMBOL(reservation_ww_class); > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ >

diff --git a/Documentation/DocBook/device-drivers.tmpl b/Documentation/DocBook/device-drivers.tmpl index cc63f30de166..ac61ebd92875 100644 --- a/Documentation/DocBook/device-drivers.tmpl +++ b/Documentation/DocBook/device-drivers.tmpl @@ -128,8 +128,7 @@ X!Edrivers/base/interface.c !Edrivers/base/bus.c </sect1> <sect1><title>Device Drivers DMA Management</title> -!Edrivers/base/dma-buf.c -!Edrivers/base/reservation.c +!Edrivers/dma-buf/dma-buf.c !Iinclude/linux/reservation.h !Edrivers/base/dma-coherent.c !Edrivers/base/dma-mapping.c diff --git a/MAINTAINERS b/MAINTAINERS index 134483f206e4..c948e53a4ee6 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2882,8 +2882,8 @@ S: Maintained L: linux-media@vger.kernel.org L: dri-devel@lists.freedesktop.org L: linaro-mm-sig@lists.linaro.org -F: drivers/base/dma-buf* -F: include/linux/dma-buf* +F: drivers/dma-buf/ +F: include/linux/dma-buf* include/linux/reservation.h F: Documentation/dma-buf-sharing.txt T: git git://git.linaro.org/people/sumitsemwal/linux-dma-buf.git diff --git a/drivers/Makefile b/drivers/Makefile index f98b50d8251d..c00337be5351 100644 --- a/drivers/Makefile +++ b/drivers/Makefile @@ -61,6 +61,7 @@ obj-$(CONFIG_FB_INTEL) += video/fbdev/intelfb/ obj-$(CONFIG_PARPORT) += parport/ obj-y += base/ block/ misc/ mfd/ nfc/ +obj-$(CONFIG_DMA_SHARED_BUFFER) += dma-buf/ obj-$(CONFIG_NUBUS) += nubus/ obj-y += macintosh/ obj-$(CONFIG_IDE) += ide/ diff --git a/drivers/base/Makefile b/drivers/base/Makefile index 04b314e0fa51..4aab26ec0292 100644 --- a/drivers/base/Makefile +++ b/drivers/base/Makefile @@ -10,7 +10,6 @@ obj-$(CONFIG_DMA_CMA) += dma-contiguous.o obj-y += power/ obj-$(CONFIG_HAS_DMA) += dma-mapping.o obj-$(CONFIG_HAVE_GENERIC_DMA_COHERENT) += dma-coherent.o -obj-$(CONFIG_DMA_SHARED_BUFFER) += dma-buf.o reservation.o obj-$(CONFIG_ISA) += isa.o obj-$(CONFIG_FW_LOADER) += firmware_class.o obj-$(CONFIG_NUMA) += node.o diff --git a/drivers/base/dma-buf.c b/drivers/base/dma-buf.c deleted file mode 100644 index 840c7fa80983..000000000000 --- a/drivers/base/dma-buf.c +++ /dev/null @@ -1,743 +0,0 @@ -/* - * Framework for buffer objects that can be shared across devices/subsystems. - * - * Copyright(C) 2011 Linaro Limited. All rights reserved. - * Author: Sumit Semwal <sumit.semwal@ti.com> - * - * Many thanks to linaro-mm-sig list, and specially - * Arnd Bergmann <arnd@arndb.de>, Rob Clark <rob@ti.com> and - * Daniel Vetter <daniel@ffwll.ch> for their support in creation and - * refining of this idea. - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License version 2 as published by - * the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. - * - * You should have received a copy of the GNU General Public License along with - * this program. If not, see <http://www.gnu.org/licenses/>. - */ - -#include <linux/fs.h> -#include <linux/slab.h> -#include <linux/dma-buf.h> -#include <linux/anon_inodes.h> -#include <linux/export.h> -#include <linux/debugfs.h> -#include <linux/seq_file.h> - -static inline int is_dma_buf_file(struct file *); - -struct dma_buf_list { - struct list_head head; - struct mutex lock; -}; - -static struct dma_buf_list db_list; - -static int dma_buf_release(struct inode *inode, struct file *file) -{ - struct dma_buf *dmabuf; - - if (!is_dma_buf_file(file)) - return -EINVAL; - - dmabuf = file->private_data; - - BUG_ON(dmabuf->vmapping_counter); - - dmabuf->ops->release(dmabuf); - - mutex_lock(&db_list.lock); - list_del(&dmabuf->list_node); - mutex_unlock(&db_list.lock); - - kfree(dmabuf); - return 0; -} - -static int dma_buf_mmap_internal(struct file *file, struct vm_area_struct *vma) -{ - struct dma_buf *dmabuf; - - if (!is_dma_buf_file(file)) - return -EINVAL; - - dmabuf = file->private_data; - - /* check for overflowing the buffer's size */ - if (vma->vm_pgoff + ((vma->vm_end - vma->vm_start) >> PAGE_SHIFT) > - dmabuf->size >> PAGE_SHIFT) - return -EINVAL; - - return dmabuf->ops->mmap(dmabuf, vma); -} - -static loff_t dma_buf_llseek(struct file *file, loff_t offset, int whence) -{ - struct dma_buf *dmabuf; - loff_t base; - - if (!is_dma_buf_file(file)) - return -EBADF; - - dmabuf = file->private_data; - - /* only support discovering the end of the buffer, - but also allow SEEK_SET to maintain the idiomatic - SEEK_END(0), SEEK_CUR(0) pattern */ - if (whence == SEEK_END) - base = dmabuf->size; - else if (whence == SEEK_SET) - base = 0; - else - return -EINVAL; - - if (offset != 0) - return -EINVAL; - - return base + offset; -} - -static const struct file_operations dma_buf_fops = { - .release = dma_buf_release, - .mmap = dma_buf_mmap_internal, - .llseek = dma_buf_llseek, -}; - -/* - * is_dma_buf_file - Check if struct file* is associated with dma_buf - */ -static inline int is_dma_buf_file(struct file *file) -{ - return file->f_op == &dma_buf_fops; -} - -/** - * dma_buf_export_named - Creates a new dma_buf, and associates an anon file - * with this buffer, so it can be exported. - * Also connect the allocator specific data and ops to the buffer. - * Additionally, provide a name string for exporter; useful in debugging. - * - * @priv: [in] Attach private data of allocator to this buffer - * @ops: [in] Attach allocator-defined dma buf ops to the new buffer. - * @size: [in] Size of the buffer - * @flags: [in] mode flags for the file. - * @exp_name: [in] name of the exporting module - useful for debugging. - * - * Returns, on success, a newly created dma_buf object, which wraps the - * supplied private data and operations for dma_buf_ops. On either missing - * ops, or error in allocating struct dma_buf, will return negative error. - * - */ -struct dma_buf *dma_buf_export_named(void *priv, const struct dma_buf_ops *ops, - size_t size, int flags, const char *exp_name) -{ - struct dma_buf *dmabuf; - struct file *file; - - if (WARN_ON(!priv || !ops - || !ops->map_dma_buf - || !ops->unmap_dma_buf - || !ops->release - || !ops->kmap_atomic - || !ops->kmap - || !ops->mmap)) { - return ERR_PTR(-EINVAL); - } - - dmabuf = kzalloc(sizeof(struct dma_buf), GFP_KERNEL); - if (dmabuf == NULL) - return ERR_PTR(-ENOMEM); - - dmabuf->priv = priv; - dmabuf->ops = ops; - dmabuf->size = size; - dmabuf->exp_name = exp_name; - - file = anon_inode_getfile("dmabuf", &dma_buf_fops, dmabuf, flags); - if (IS_ERR(file)) { - kfree(dmabuf); - return ERR_CAST(file); - } - - file->f_mode |= FMODE_LSEEK; - dmabuf->file = file; - - mutex_init(&dmabuf->lock); - INIT_LIST_HEAD(&dmabuf->attachments); - - mutex_lock(&db_list.lock); - list_add(&dmabuf->list_node, &db_list.head); - mutex_unlock(&db_list.lock); - - return dmabuf; -} -EXPORT_SYMBOL_GPL(dma_buf_export_named); - - -/** - * dma_buf_fd - returns a file descriptor for the given dma_buf - * @dmabuf: [in] pointer to dma_buf for which fd is required. - * @flags: [in] flags to give to fd - * - * On success, returns an associated 'fd'. Else, returns error. - */ -int dma_buf_fd(struct dma_buf *dmabuf, int flags) -{ - int fd; - - if (!dmabuf || !dmabuf->file) - return -EINVAL; - - fd = get_unused_fd_flags(flags); - if (fd < 0) - return fd; - - fd_install(fd, dmabuf->file); - - return fd; -} -EXPORT_SYMBOL_GPL(dma_buf_fd); - -/** - * dma_buf_get - returns the dma_buf structure related to an fd - * @fd: [in] fd associated with the dma_buf to be returned - * - * On success, returns the dma_buf structure associated with an fd; uses - * file's refcounting done by fget to increase refcount. returns ERR_PTR - * otherwise. - */ -struct dma_buf *dma_buf_get(int fd) -{ - struct file *file; - - file = fget(fd); - - if (!file) - return ERR_PTR(-EBADF); - - if (!is_dma_buf_file(file)) { - fput(file); - return ERR_PTR(-EINVAL); - } - - return file->private_data; -} -EXPORT_SYMBOL_GPL(dma_buf_get); - -/** - * dma_buf_put - decreases refcount of the buffer - * @dmabuf: [in] buffer to reduce refcount of - * - * Uses file's refcounting done implicitly by fput() - */ -void dma_buf_put(struct dma_buf *dmabuf) -{ - if (WARN_ON(!dmabuf || !dmabuf->file)) - return; - - fput(dmabuf->file); -} -EXPORT_SYMBOL_GPL(dma_buf_put); - -/** - * dma_buf_attach - Add the device to dma_buf's attachments list; optionally, - * calls attach() of dma_buf_ops to allow device-specific attach functionality - * @dmabuf: [in] buffer to attach device to. - * @dev: [in] device to be attached. - * - * Returns struct dma_buf_attachment * for this attachment; returns ERR_PTR on - * error. - */ -struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf, - struct device *dev) -{ - struct dma_buf_attachment *attach; - int ret; - - if (WARN_ON(!dmabuf || !dev)) - return ERR_PTR(-EINVAL); - - attach = kzalloc(sizeof(struct dma_buf_attachment), GFP_KERNEL); - if (attach == NULL) - return ERR_PTR(-ENOMEM); - - attach->dev = dev; - attach->dmabuf = dmabuf; - - mutex_lock(&dmabuf->lock); - - if (dmabuf->ops->attach) { - ret = dmabuf->ops->attach(dmabuf, dev, attach); - if (ret) - goto err_attach; - } - list_add(&attach->node, &dmabuf->attachments); - - mutex_unlock(&dmabuf->lock); - return attach; - -err_attach: - kfree(attach); - mutex_unlock(&dmabuf->lock); - return ERR_PTR(ret); -} -EXPORT_SYMBOL_GPL(dma_buf_attach); - -/** - * dma_buf_detach - Remove the given attachment from dmabuf's attachments list; - * optionally calls detach() of dma_buf_ops for device-specific detach - * @dmabuf: [in] buffer to detach from. - * @attach: [in] attachment to be detached; is free'd after this call. - * - */ -void dma_buf_detach(struct dma_buf *dmabuf, struct dma_buf_attachment *attach) -{ - if (WARN_ON(!dmabuf || !attach)) - return; - - mutex_lock(&dmabuf->lock); - list_del(&attach->node); - if (dmabuf->ops->detach) - dmabuf->ops->detach(dmabuf, attach); - - mutex_unlock(&dmabuf->lock); - kfree(attach); -} -EXPORT_SYMBOL_GPL(dma_buf_detach); - -/** - * dma_buf_map_attachment - Returns the scatterlist table of the attachment; - * mapped into _device_ address space. Is a wrapper for map_dma_buf() of the - * dma_buf_ops. - * @attach: [in] attachment whose scatterlist is to be returned - * @direction: [in] direction of DMA transfer - * - * Returns sg_table containing the scatterlist to be returned; returns ERR_PTR - * on error. - */ -struct sg_table *dma_buf_map_attachment(struct dma_buf_attachment *attach, - enum dma_data_direction direction) -{ - struct sg_table *sg_table = ERR_PTR(-EINVAL); - - might_sleep(); - - if (WARN_ON(!attach || !attach->dmabuf)) - return ERR_PTR(-EINVAL); - - sg_table = attach->dmabuf->ops->map_dma_buf(attach, direction); - if (!sg_table) - sg_table = ERR_PTR(-ENOMEM); - - return sg_table; -} -EXPORT_SYMBOL_GPL(dma_buf_map_attachment); - -/** - * dma_buf_unmap_attachment - unmaps and decreases usecount of the buffer;might - * deallocate the scatterlist associated. Is a wrapper for unmap_dma_buf() of - * dma_buf_ops. - * @attach: [in] attachment to unmap buffer from - * @sg_table: [in] scatterlist info of the buffer to unmap - * @direction: [in] direction of DMA transfer - * - */ -void dma_buf_unmap_attachment(struct dma_buf_attachment *attach, - struct sg_table *sg_table, - enum dma_data_direction direction) -{ - might_sleep(); - - if (WARN_ON(!attach || !attach->dmabuf || !sg_table)) - return; - - attach->dmabuf->ops->unmap_dma_buf(attach, sg_table, - direction); -} -EXPORT_SYMBOL_GPL(dma_buf_unmap_attachment); - - -/** - * dma_buf_begin_cpu_access - Must be called before accessing a dma_buf from the - * cpu in the kernel context. Calls begin_cpu_access to allow exporter-specific - * preparations. Coherency is only guaranteed in the specified range for the - * specified access direction. - * @dmabuf: [in] buffer to prepare cpu access for. - * @start: [in] start of range for cpu access. - * @len: [in] length of range for cpu access. - * @direction: [in] length of range for cpu access. - * - * Can return negative error values, returns 0 on success. - */ -int dma_buf_begin_cpu_access(struct dma_buf *dmabuf, size_t start, size_t len, - enum dma_data_direction direction) -{ - int ret = 0; - - if (WARN_ON(!dmabuf)) - return -EINVAL; - - if (dmabuf->ops->begin_cpu_access) - ret = dmabuf->ops->begin_cpu_access(dmabuf, start, len, direction); - - return ret; -} -EXPORT_SYMBOL_GPL(dma_buf_begin_cpu_access); - -/** - * dma_buf_end_cpu_access - Must be called after accessing a dma_buf from the - * cpu in the kernel context. Calls end_cpu_access to allow exporter-specific - * actions. Coherency is only guaranteed in the specified range for the - * specified access direction. - * @dmabuf: [in] buffer to complete cpu access for. - * @start: [in] start of range for cpu access. - * @len: [in] length of range for cpu access. - * @direction: [in] length of range for cpu access. - * - * This call must always succeed. - */ -void dma_buf_end_cpu_access(struct dma_buf *dmabuf, size_t start, size_t len, - enum dma_data_direction direction) -{ - WARN_ON(!dmabuf); - - if (dmabuf->ops->end_cpu_access) - dmabuf->ops->end_cpu_access(dmabuf, start, len, direction); -} -EXPORT_SYMBOL_GPL(dma_buf_end_cpu_access); - -/** - * dma_buf_kmap_atomic - Map a page of the buffer object into kernel address - * space. The same restrictions as for kmap_atomic and friends apply. - * @dmabuf: [in] buffer to map page from. - * @page_num: [in] page in PAGE_SIZE units to map. - * - * This call must always succeed, any necessary preparations that might fail - * need to be done in begin_cpu_access. - */ -void *dma_buf_kmap_atomic(struct dma_buf *dmabuf, unsigned long page_num) -{ - WARN_ON(!dmabuf); - - return dmabuf->ops->kmap_atomic(dmabuf, page_num); -} -EXPORT_SYMBOL_GPL(dma_buf_kmap_atomic); - -/** - * dma_buf_kunmap_atomic - Unmap a page obtained by dma_buf_kmap_atomic. - * @dmabuf: [in] buffer to unmap page from. - * @page_num: [in] page in PAGE_SIZE units to unmap. - * @vaddr: [in] kernel space pointer obtained from dma_buf_kmap_atomic. - * - * This call must always succeed. - */ -void dma_buf_kunmap_atomic(struct dma_buf *dmabuf, unsigned long page_num, - void *vaddr) -{ - WARN_ON(!dmabuf); - - if (dmabuf->ops->kunmap_atomic) - dmabuf->ops->kunmap_atomic(dmabuf, page_num, vaddr); -} -EXPORT_SYMBOL_GPL(dma_buf_kunmap_atomic); - -/** - * dma_buf_kmap - Map a page of the buffer object into kernel address space. The - * same restrictions as for kmap and friends apply. - * @dmabuf: [in] buffer to map page from. - * @page_num: [in] page in PAGE_SIZE units to map. - * - * This call must always succeed, any necessary preparations that might fail - * need to be done in begin_cpu_access. - */ -void *dma_buf_kmap(struct dma_buf *dmabuf, unsigned long page_num) -{ - WARN_ON(!dmabuf); - - return dmabuf->ops->kmap(dmabuf, page_num); -} -EXPORT_SYMBOL_GPL(dma_buf_kmap); - -/** - * dma_buf_kunmap - Unmap a page obtained by dma_buf_kmap. - * @dmabuf: [in] buffer to unmap page from. - * @page_num: [in] page in PAGE_SIZE units to unmap. - * @vaddr: [in] kernel space pointer obtained from dma_buf_kmap. - * - * This call must always succeed. - */ -void dma_buf_kunmap(struct dma_buf *dmabuf, unsigned long page_num, - void *vaddr) -{ - WARN_ON(!dmabuf); - - if (dmabuf->ops->kunmap) - dmabuf->ops->kunmap(dmabuf, page_num, vaddr); -} -EXPORT_SYMBOL_GPL(dma_buf_kunmap); - - -/** - * dma_buf_mmap - Setup up a userspace mmap with the given vma - * @dmabuf: [in] buffer that should back the vma - * @vma: [in] vma for the mmap - * @pgoff: [in] offset in pages where this mmap should start within the - * dma-buf buffer. - * - * This function adjusts the passed in vma so that it points at the file of the - * dma_buf operation. It also adjusts the starting pgoff and does bounds - * checking on the size of the vma. Then it calls the exporters mmap function to - * set up the mapping. - * - * Can return negative error values, returns 0 on success. - */ -int dma_buf_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma, - unsigned long pgoff) -{ - struct file *oldfile; - int ret; - - if (WARN_ON(!dmabuf || !vma)) - return -EINVAL; - - /* check for offset overflow */ - if (pgoff + ((vma->vm_end - vma->vm_start) >> PAGE_SHIFT) < pgoff) - return -EOVERFLOW; - - /* check for overflowing the buffer's size */ - if (pgoff + ((vma->vm_end - vma->vm_start) >> PAGE_SHIFT) > - dmabuf->size >> PAGE_SHIFT) - return -EINVAL; - - /* readjust the vma */ - get_file(dmabuf->file); - oldfile = vma->vm_file; - vma->vm_file = dmabuf->file; - vma->vm_pgoff = pgoff; - - ret = dmabuf->ops->mmap(dmabuf, vma); - if (ret) { - /* restore old parameters on failure */ - vma->vm_file = oldfile; - fput(dmabuf->file); - } else { - if (oldfile) - fput(oldfile); - } - return ret; - -} -EXPORT_SYMBOL_GPL(dma_buf_mmap); - -/** - * dma_buf_vmap - Create virtual mapping for the buffer object into kernel - * address space. Same restrictions as for vmap and friends apply. - * @dmabuf: [in] buffer to vmap - * - * This call may fail due to lack of virtual mapping address space. - * These calls are optional in drivers. The intended use for them - * is for mapping objects linear in kernel space for high use objects. - * Please attempt to use kmap/kunmap before thinking about these interfaces. - * - * Returns NULL on error. - */ -void *dma_buf_vmap(struct dma_buf *dmabuf) -{ - void *ptr; - - if (WARN_ON(!dmabuf)) - return NULL; - - if (!dmabuf->ops->vmap) - return NULL; - - mutex_lock(&dmabuf->lock); - if (dmabuf->vmapping_counter) { - dmabuf->vmapping_counter++; - BUG_ON(!dmabuf->vmap_ptr); - ptr = dmabuf->vmap_ptr; - goto out_unlock; - } - - BUG_ON(dmabuf->vmap_ptr); - - ptr = dmabuf->ops->vmap(dmabuf); - if (WARN_ON_ONCE(IS_ERR(ptr))) - ptr = NULL; - if (!ptr) - goto out_unlock; - - dmabuf->vmap_ptr = ptr; - dmabuf->vmapping_counter = 1; - -out_unlock: - mutex_unlock(&dmabuf->lock); - return ptr; -} -EXPORT_SYMBOL_GPL(dma_buf_vmap); - -/** - * dma_buf_vunmap - Unmap a vmap obtained by dma_buf_vmap. - * @dmabuf: [in] buffer to vunmap - * @vaddr: [in] vmap to vunmap - */ -void dma_buf_vunmap(struct dma_buf *dmabuf, void *vaddr) -{ - if (WARN_ON(!dmabuf)) - return; - - BUG_ON(!dmabuf->vmap_ptr); - BUG_ON(dmabuf->vmapping_counter == 0); - BUG_ON(dmabuf->vmap_ptr != vaddr); - - mutex_lock(&dmabuf->lock); - if (--dmabuf->vmapping_counter == 0) { - if (dmabuf->ops->vunmap) - dmabuf->ops->vunmap(dmabuf, vaddr); - dmabuf->vmap_ptr = NULL; - } - mutex_unlock(&dmabuf->lock); -} -EXPORT_SYMBOL_GPL(dma_buf_vunmap); - -#ifdef CONFIG_DEBUG_FS -static int dma_buf_describe(struct seq_file *s) -{ - int ret; - struct dma_buf *buf_obj; - struct dma_buf_attachment *attach_obj; - int count = 0, attach_count; - size_t size = 0; - - ret = mutex_lock_interruptible(&db_list.lock); - - if (ret) - return ret; - - seq_puts(s, "\nDma-buf Objects:\n"); - seq_puts(s, "size\tflags\tmode\tcount\texp_name\n"); - - list_for_each_entry(buf_obj, &db_list.head, list_node) { - ret = mutex_lock_interruptible(&buf_obj->lock); - - if (ret) { - seq_puts(s, - "\tERROR locking buffer object: skipping\n"); - continue; - } - - seq_printf(s, "%08zu\t%08x\t%08x\t%08ld\t%s\n", - buf_obj->size, - buf_obj->file->f_flags, buf_obj->file->f_mode, - (long)(buf_obj->file->f_count.counter), - buf_obj->exp_name); - - seq_puts(s, "\tAttached Devices:\n"); - attach_count = 0; - - list_for_each_entry(attach_obj, &buf_obj->attachments, node) { - seq_puts(s, "\t"); - - seq_printf(s, "%s\n", dev_name(attach_obj->dev)); - attach_count++; - } - - seq_printf(s, "Total %d devices attached\n\n", - attach_count); - - count++; - size += buf_obj->size; - mutex_unlock(&buf_obj->lock); - } - - seq_printf(s, "\nTotal %d objects, %zu bytes\n", count, size); - - mutex_unlock(&db_list.lock); - return 0; -} - -static int dma_buf_show(struct seq_file *s, void *unused) -{ - void (*func)(struct seq_file *) = s->private; - func(s); - return 0; -} - -static int dma_buf_debug_open(struct inode *inode, struct file *file) -{ - return single_open(file, dma_buf_show, inode->i_private); -} - -static const struct file_operations dma_buf_debug_fops = { - .open = dma_buf_debug_open, - .read = seq_read, - .llseek = seq_lseek, - .release = single_release, -}; - -static struct dentry *dma_buf_debugfs_dir; - -static int dma_buf_init_debugfs(void) -{ - int err = 0; - dma_buf_debugfs_dir = debugfs_create_dir("dma_buf", NULL); - if (IS_ERR(dma_buf_debugfs_dir)) { - err = PTR_ERR(dma_buf_debugfs_dir); - dma_buf_debugfs_dir = NULL; - return err; - } - - err = dma_buf_debugfs_create_file("bufinfo", dma_buf_describe); - - if (err) - pr_debug("dma_buf: debugfs: failed to create node bufinfo\n"); - - return err; -} - -static void dma_buf_uninit_debugfs(void) -{ - if (dma_buf_debugfs_dir) - debugfs_remove_recursive(dma_buf_debugfs_dir); -} - -int dma_buf_debugfs_create_file(const char *name, - int (*write)(struct seq_file *)) -{ - struct dentry *d; - - d = debugfs_create_file(name, S_IRUGO, dma_buf_debugfs_dir, - write, &dma_buf_debug_fops); - - return PTR_ERR_OR_ZERO(d); -} -#else -static inline int dma_buf_init_debugfs(void) -{ - return 0; -} -static inline void dma_buf_uninit_debugfs(void) -{ -} -#endif - -static int __init dma_buf_init(void) -{ - mutex_init(&db_list.lock); - INIT_LIST_HEAD(&db_list.head); - dma_buf_init_debugfs(); - return 0; -} -subsys_initcall(dma_buf_init); - -static void __exit dma_buf_deinit(void) -{ - dma_buf_uninit_debugfs(); -} -__exitcall(dma_buf_deinit); diff --git a/drivers/base/reservation.c b/drivers/base/reservation.c deleted file mode 100644 index a73fbf3b8e56..000000000000 --- a/drivers/base/reservation.c +++ /dev/null @@ -1,39 +0,0 @@ -/* - * Copyright (C) 2012-2013 Canonical Ltd - * - * Based on bo.c which bears the following copyright notice, - * but is dual licensed: - * - * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA - * All Rights Reserved. - * - * Permission is hereby granted, free of charge, to any person obtaining a - * copy of this software and associated documentation files (the - * "Software"), to deal in the Software without restriction, including - * without limitation the rights to use, copy, modify, merge, publish, - * distribute, sub license, and/or sell copies of the Software, and to - * permit persons to whom the Software is furnished to do so, subject to - * the following conditions: - * - * The above copyright notice and this permission notice (including the - * next paragraph) shall be included in all copies or substantial portions - * of the Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR - * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL - * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, - * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR - * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE - * USE OR OTHER DEALINGS IN THE SOFTWARE. - * - **************************************************************************/ -/* - * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com> - */ - -#include <linux/reservation.h> -#include <linux/export.h> - -DEFINE_WW_CLASS(reservation_ww_class); -EXPORT_SYMBOL(reservation_ww_class); diff --git a/drivers/dma-buf/Makefile b/drivers/dma-buf/Makefile new file mode 100644 index 000000000000..4a4f4c9bacd0 --- /dev/null +++ b/drivers/dma-buf/Makefile @@ -0,0 +1 @@ +obj-y := dma-buf.o reservation.o diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c new file mode 100644 index 000000000000..840c7fa80983 --- /dev/null +++ b/drivers/dma-buf/dma-buf.c @@ -0,0 +1,743 @@ +/* + * Framework for buffer objects that can be shared across devices/subsystems. + * + * Copyright(C) 2011 Linaro Limited. All rights reserved. + * Author: Sumit Semwal <sumit.semwal@ti.com> + * + * Many thanks to linaro-mm-sig list, and specially + * Arnd Bergmann <arnd@arndb.de>, Rob Clark <rob@ti.com> and + * Daniel Vetter <daniel@ffwll.ch> for their support in creation and + * refining of this idea. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/fs.h> +#include <linux/slab.h> +#include <linux/dma-buf.h> +#include <linux/anon_inodes.h> +#include <linux/export.h> +#include <linux/debugfs.h> +#include <linux/seq_file.h> + +static inline int is_dma_buf_file(struct file *); + +struct dma_buf_list { + struct list_head head; + struct mutex lock; +}; + +static struct dma_buf_list db_list; + +static int dma_buf_release(struct inode *inode, struct file *file) +{ + struct dma_buf *dmabuf; + + if (!is_dma_buf_file(file)) + return -EINVAL; + + dmabuf = file->private_data; + + BUG_ON(dmabuf->vmapping_counter); + + dmabuf->ops->release(dmabuf); + + mutex_lock(&db_list.lock); + list_del(&dmabuf->list_node); + mutex_unlock(&db_list.lock); + + kfree(dmabuf); + return 0; +} + +static int dma_buf_mmap_internal(struct file *file, struct vm_area_struct *vma) +{ + struct dma_buf *dmabuf; + + if (!is_dma_buf_file(file)) + return -EINVAL; + + dmabuf = file->private_data; + + /* check for overflowing the buffer's size */ + if (vma->vm_pgoff + ((vma->vm_end - vma->vm_start) >> PAGE_SHIFT) > + dmabuf->size >> PAGE_SHIFT) + return -EINVAL; + + return dmabuf->ops->mmap(dmabuf, vma); +} + +static loff_t dma_buf_llseek(struct file *file, loff_t offset, int whence) +{ + struct dma_buf *dmabuf; + loff_t base; + + if (!is_dma_buf_file(file)) + return -EBADF; + + dmabuf = file->private_data; + + /* only support discovering the end of the buffer, + but also allow SEEK_SET to maintain the idiomatic + SEEK_END(0), SEEK_CUR(0) pattern */ + if (whence == SEEK_END) + base = dmabuf->size; + else if (whence == SEEK_SET) + base = 0; + else + return -EINVAL; + + if (offset != 0) + return -EINVAL; + + return base + offset; +} + +static const struct file_operations dma_buf_fops = { + .release = dma_buf_release, + .mmap = dma_buf_mmap_internal, + .llseek = dma_buf_llseek, +}; + +/* + * is_dma_buf_file - Check if struct file* is associated with dma_buf + */ +static inline int is_dma_buf_file(struct file *file) +{ + return file->f_op == &dma_buf_fops; +} + +/** + * dma_buf_export_named - Creates a new dma_buf, and associates an anon file + * with this buffer, so it can be exported. + * Also connect the allocator specific data and ops to the buffer. + * Additionally, provide a name string for exporter; useful in debugging. + * + * @priv: [in] Attach private data of allocator to this buffer + * @ops: [in] Attach allocator-defined dma buf ops to the new buffer. + * @size: [in] Size of the buffer + * @flags: [in] mode flags for the file. + * @exp_name: [in] name of the exporting module - useful for debugging. + * + * Returns, on success, a newly created dma_buf object, which wraps the + * supplied private data and operations for dma_buf_ops. On either missing + * ops, or error in allocating struct dma_buf, will return negative error. + * + */ +struct dma_buf *dma_buf_export_named(void *priv, const struct dma_buf_ops *ops, + size_t size, int flags, const char *exp_name) +{ + struct dma_buf *dmabuf; + struct file *file; + + if (WARN_ON(!priv || !ops + || !ops->map_dma_buf + || !ops->unmap_dma_buf + || !ops->release + || !ops->kmap_atomic + || !ops->kmap + || !ops->mmap)) { + return ERR_PTR(-EINVAL); + } + + dmabuf = kzalloc(sizeof(struct dma_buf), GFP_KERNEL); + if (dmabuf == NULL) + return ERR_PTR(-ENOMEM); + + dmabuf->priv = priv; + dmabuf->ops = ops; + dmabuf->size = size; + dmabuf->exp_name = exp_name; + + file = anon_inode_getfile("dmabuf", &dma_buf_fops, dmabuf, flags); + if (IS_ERR(file)) { + kfree(dmabuf); + return ERR_CAST(file); + } + + file->f_mode |= FMODE_LSEEK; + dmabuf->file = file; + + mutex_init(&dmabuf->lock); + INIT_LIST_HEAD(&dmabuf->attachments); + + mutex_lock(&db_list.lock); + list_add(&dmabuf->list_node, &db_list.head); + mutex_unlock(&db_list.lock); + + return dmabuf; +} +EXPORT_SYMBOL_GPL(dma_buf_export_named); + + +/** + * dma_buf_fd - returns a file descriptor for the given dma_buf + * @dmabuf: [in] pointer to dma_buf for which fd is required. + * @flags: [in] flags to give to fd + * + * On success, returns an associated 'fd'. Else, returns error. + */ +int dma_buf_fd(struct dma_buf *dmabuf, int flags) +{ + int fd; + + if (!dmabuf || !dmabuf->file) + return -EINVAL; + + fd = get_unused_fd_flags(flags); + if (fd < 0) + return fd; + + fd_install(fd, dmabuf->file); + + return fd; +} +EXPORT_SYMBOL_GPL(dma_buf_fd); + +/** + * dma_buf_get - returns the dma_buf structure related to an fd + * @fd: [in] fd associated with the dma_buf to be returned + * + * On success, returns the dma_buf structure associated with an fd; uses + * file's refcounting done by fget to increase refcount. returns ERR_PTR + * otherwise. + */ +struct dma_buf *dma_buf_get(int fd) +{ + struct file *file; + + file = fget(fd); + + if (!file) + return ERR_PTR(-EBADF); + + if (!is_dma_buf_file(file)) { + fput(file); + return ERR_PTR(-EINVAL); + } + + return file->private_data; +} +EXPORT_SYMBOL_GPL(dma_buf_get); + +/** + * dma_buf_put - decreases refcount of the buffer + * @dmabuf: [in] buffer to reduce refcount of + * + * Uses file's refcounting done implicitly by fput() + */ +void dma_buf_put(struct dma_buf *dmabuf) +{ + if (WARN_ON(!dmabuf || !dmabuf->file)) + return; + + fput(dmabuf->file); +} +EXPORT_SYMBOL_GPL(dma_buf_put); + +/** + * dma_buf_attach - Add the device to dma_buf's attachments list; optionally, + * calls attach() of dma_buf_ops to allow device-specific attach functionality + * @dmabuf: [in] buffer to attach device to. + * @dev: [in] device to be attached. + * + * Returns struct dma_buf_attachment * for this attachment; returns ERR_PTR on + * error. + */ +struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf, + struct device *dev) +{ + struct dma_buf_attachment *attach; + int ret; + + if (WARN_ON(!dmabuf || !dev)) + return ERR_PTR(-EINVAL); + + attach = kzalloc(sizeof(struct dma_buf_attachment), GFP_KERNEL); + if (attach == NULL) + return ERR_PTR(-ENOMEM); + + attach->dev = dev; + attach->dmabuf = dmabuf; + + mutex_lock(&dmabuf->lock); + + if (dmabuf->ops->attach) { + ret = dmabuf->ops->attach(dmabuf, dev, attach); + if (ret) + goto err_attach; + } + list_add(&attach->node, &dmabuf->attachments); + + mutex_unlock(&dmabuf->lock); + return attach; + +err_attach: + kfree(attach); + mutex_unlock(&dmabuf->lock); + return ERR_PTR(ret); +} +EXPORT_SYMBOL_GPL(dma_buf_attach); + +/** + * dma_buf_detach - Remove the given attachment from dmabuf's attachments list; + * optionally calls detach() of dma_buf_ops for device-specific detach + * @dmabuf: [in] buffer to detach from. + * @attach: [in] attachment to be detached; is free'd after this call. + * + */ +void dma_buf_detach(struct dma_buf *dmabuf, struct dma_buf_attachment *attach) +{ + if (WARN_ON(!dmabuf || !attach)) + return; + + mutex_lock(&dmabuf->lock); + list_del(&attach->node); + if (dmabuf->ops->detach) + dmabuf->ops->detach(dmabuf, attach); + + mutex_unlock(&dmabuf->lock); + kfree(attach); +} +EXPORT_SYMBOL_GPL(dma_buf_detach); + +/** + * dma_buf_map_attachment - Returns the scatterlist table of the attachment; + * mapped into _device_ address space. Is a wrapper for map_dma_buf() of the + * dma_buf_ops. + * @attach: [in] attachment whose scatterlist is to be returned + * @direction: [in] direction of DMA transfer + * + * Returns sg_table containing the scatterlist to be returned; returns ERR_PTR + * on error. + */ +struct sg_table *dma_buf_map_attachment(struct dma_buf_attachment *attach, + enum dma_data_direction direction) +{ + struct sg_table *sg_table = ERR_PTR(-EINVAL); + + might_sleep(); + + if (WARN_ON(!attach || !attach->dmabuf)) + return ERR_PTR(-EINVAL); + + sg_table = attach->dmabuf->ops->map_dma_buf(attach, direction); + if (!sg_table) + sg_table = ERR_PTR(-ENOMEM); + + return sg_table; +} +EXPORT_SYMBOL_GPL(dma_buf_map_attachment); + +/** + * dma_buf_unmap_attachment - unmaps and decreases usecount of the buffer;might + * deallocate the scatterlist associated. Is a wrapper for unmap_dma_buf() of + * dma_buf_ops. + * @attach: [in] attachment to unmap buffer from + * @sg_table: [in] scatterlist info of the buffer to unmap + * @direction: [in] direction of DMA transfer + * + */ +void dma_buf_unmap_attachment(struct dma_buf_attachment *attach, + struct sg_table *sg_table, + enum dma_data_direction direction) +{ + might_sleep(); + + if (WARN_ON(!attach || !attach->dmabuf || !sg_table)) + return; + + attach->dmabuf->ops->unmap_dma_buf(attach, sg_table, + direction); +} +EXPORT_SYMBOL_GPL(dma_buf_unmap_attachment); + + +/** + * dma_buf_begin_cpu_access - Must be called before accessing a dma_buf from the + * cpu in the kernel context. Calls begin_cpu_access to allow exporter-specific + * preparations. Coherency is only guaranteed in the specified range for the + * specified access direction. + * @dmabuf: [in] buffer to prepare cpu access for. + * @start: [in] start of range for cpu access. + * @len: [in] length of range for cpu access. + * @direction: [in] length of range for cpu access. + * + * Can return negative error values, returns 0 on success. + */ +int dma_buf_begin_cpu_access(struct dma_buf *dmabuf, size_t start, size_t len, + enum dma_data_direction direction) +{ + int ret = 0; + + if (WARN_ON(!dmabuf)) + return -EINVAL; + + if (dmabuf->ops->begin_cpu_access) + ret = dmabuf->ops->begin_cpu_access(dmabuf, start, len, direction); + + return ret; +} +EXPORT_SYMBOL_GPL(dma_buf_begin_cpu_access); + +/** + * dma_buf_end_cpu_access - Must be called after accessing a dma_buf from the + * cpu in the kernel context. Calls end_cpu_access to allow exporter-specific + * actions. Coherency is only guaranteed in the specified range for the + * specified access direction. + * @dmabuf: [in] buffer to complete cpu access for. + * @start: [in] start of range for cpu access. + * @len: [in] length of range for cpu access. + * @direction: [in] length of range for cpu access. + * + * This call must always succeed. + */ +void dma_buf_end_cpu_access(struct dma_buf *dmabuf, size_t start, size_t len, + enum dma_data_direction direction) +{ + WARN_ON(!dmabuf); + + if (dmabuf->ops->end_cpu_access) + dmabuf->ops->end_cpu_access(dmabuf, start, len, direction); +} +EXPORT_SYMBOL_GPL(dma_buf_end_cpu_access); + +/** + * dma_buf_kmap_atomic - Map a page of the buffer object into kernel address + * space. The same restrictions as for kmap_atomic and friends apply. + * @dmabuf: [in] buffer to map page from. + * @page_num: [in] page in PAGE_SIZE units to map. + * + * This call must always succeed, any necessary preparations that might fail + * need to be done in begin_cpu_access. + */ +void *dma_buf_kmap_atomic(struct dma_buf *dmabuf, unsigned long page_num) +{ + WARN_ON(!dmabuf); + + return dmabuf->ops->kmap_atomic(dmabuf, page_num); +} +EXPORT_SYMBOL_GPL(dma_buf_kmap_atomic); + +/** + * dma_buf_kunmap_atomic - Unmap a page obtained by dma_buf_kmap_atomic. + * @dmabuf: [in] buffer to unmap page from. + * @page_num: [in] page in PAGE_SIZE units to unmap. + * @vaddr: [in] kernel space pointer obtained from dma_buf_kmap_atomic. + * + * This call must always succeed. + */ +void dma_buf_kunmap_atomic(struct dma_buf *dmabuf, unsigned long page_num, + void *vaddr) +{ + WARN_ON(!dmabuf); + + if (dmabuf->ops->kunmap_atomic) + dmabuf->ops->kunmap_atomic(dmabuf, page_num, vaddr); +} +EXPORT_SYMBOL_GPL(dma_buf_kunmap_atomic); + +/** + * dma_buf_kmap - Map a page of the buffer object into kernel address space. The + * same restrictions as for kmap and friends apply. + * @dmabuf: [in] buffer to map page from. + * @page_num: [in] page in PAGE_SIZE units to map. + * + * This call must always succeed, any necessary preparations that might fail + * need to be done in begin_cpu_access. + */ +void *dma_buf_kmap(struct dma_buf *dmabuf, unsigned long page_num) +{ + WARN_ON(!dmabuf); + + return dmabuf->ops->kmap(dmabuf, page_num); +} +EXPORT_SYMBOL_GPL(dma_buf_kmap); + +/** + * dma_buf_kunmap - Unmap a page obtained by dma_buf_kmap. + * @dmabuf: [in] buffer to unmap page from. + * @page_num: [in] page in PAGE_SIZE units to unmap. + * @vaddr: [in] kernel space pointer obtained from dma_buf_kmap. + * + * This call must always succeed. + */ +void dma_buf_kunmap(struct dma_buf *dmabuf, unsigned long page_num, + void *vaddr) +{ + WARN_ON(!dmabuf); + + if (dmabuf->ops->kunmap) + dmabuf->ops->kunmap(dmabuf, page_num, vaddr); +} +EXPORT_SYMBOL_GPL(dma_buf_kunmap); + + +/** + * dma_buf_mmap - Setup up a userspace mmap with the given vma + * @dmabuf: [in] buffer that should back the vma + * @vma: [in] vma for the mmap + * @pgoff: [in] offset in pages where this mmap should start within the + * dma-buf buffer. + * + * This function adjusts the passed in vma so that it points at the file of the + * dma_buf operation. It also adjusts the starting pgoff and does bounds + * checking on the size of the vma. Then it calls the exporters mmap function to + * set up the mapping. + * + * Can return negative error values, returns 0 on success. + */ +int dma_buf_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma, + unsigned long pgoff) +{ + struct file *oldfile; + int ret; + + if (WARN_ON(!dmabuf || !vma)) + return -EINVAL; + + /* check for offset overflow */ + if (pgoff + ((vma->vm_end - vma->vm_start) >> PAGE_SHIFT) < pgoff) + return -EOVERFLOW; + + /* check for overflowing the buffer's size */ + if (pgoff + ((vma->vm_end - vma->vm_start) >> PAGE_SHIFT) > + dmabuf->size >> PAGE_SHIFT) + return -EINVAL; + + /* readjust the vma */ + get_file(dmabuf->file); + oldfile = vma->vm_file; + vma->vm_file = dmabuf->file; + vma->vm_pgoff = pgoff; + + ret = dmabuf->ops->mmap(dmabuf, vma); + if (ret) { + /* restore old parameters on failure */ + vma->vm_file = oldfile; + fput(dmabuf->file); + } else { + if (oldfile) + fput(oldfile); + } + return ret; + +} +EXPORT_SYMBOL_GPL(dma_buf_mmap); + +/** + * dma_buf_vmap - Create virtual mapping for the buffer object into kernel + * address space. Same restrictions as for vmap and friends apply. + * @dmabuf: [in] buffer to vmap + * + * This call may fail due to lack of virtual mapping address space. + * These calls are optional in drivers. The intended use for them + * is for mapping objects linear in kernel space for high use objects. + * Please attempt to use kmap/kunmap before thinking about these interfaces. + * + * Returns NULL on error. + */ +void *dma_buf_vmap(struct dma_buf *dmabuf) +{ + void *ptr; + + if (WARN_ON(!dmabuf)) + return NULL; + + if (!dmabuf->ops->vmap) + return NULL; + + mutex_lock(&dmabuf->lock); + if (dmabuf->vmapping_counter) { + dmabuf->vmapping_counter++; + BUG_ON(!dmabuf->vmap_ptr); + ptr = dmabuf->vmap_ptr; + goto out_unlock; + } + + BUG_ON(dmabuf->vmap_ptr); + + ptr = dmabuf->ops->vmap(dmabuf); + if (WARN_ON_ONCE(IS_ERR(ptr))) + ptr = NULL; + if (!ptr) + goto out_unlock; + + dmabuf->vmap_ptr = ptr; + dmabuf->vmapping_counter = 1; + +out_unlock: + mutex_unlock(&dmabuf->lock); + return ptr; +} +EXPORT_SYMBOL_GPL(dma_buf_vmap); + +/** + * dma_buf_vunmap - Unmap a vmap obtained by dma_buf_vmap. + * @dmabuf: [in] buffer to vunmap + * @vaddr: [in] vmap to vunmap + */ +void dma_buf_vunmap(struct dma_buf *dmabuf, void *vaddr) +{ + if (WARN_ON(!dmabuf)) + return; + + BUG_ON(!dmabuf->vmap_ptr); + BUG_ON(dmabuf->vmapping_counter == 0); + BUG_ON(dmabuf->vmap_ptr != vaddr); + + mutex_lock(&dmabuf->lock); + if (--dmabuf->vmapping_counter == 0) { + if (dmabuf->ops->vunmap) + dmabuf->ops->vunmap(dmabuf, vaddr); + dmabuf->vmap_ptr = NULL; + } + mutex_unlock(&dmabuf->lock); +} +EXPORT_SYMBOL_GPL(dma_buf_vunmap); + +#ifdef CONFIG_DEBUG_FS +static int dma_buf_describe(struct seq_file *s) +{ + int ret; + struct dma_buf *buf_obj; + struct dma_buf_attachment *attach_obj; + int count = 0, attach_count; + size_t size = 0; + + ret = mutex_lock_interruptible(&db_list.lock); + + if (ret) + return ret; + + seq_puts(s, "\nDma-buf Objects:\n"); + seq_puts(s, "size\tflags\tmode\tcount\texp_name\n"); + + list_for_each_entry(buf_obj, &db_list.head, list_node) { + ret = mutex_lock_interruptible(&buf_obj->lock); + + if (ret) { + seq_puts(s, + "\tERROR locking buffer object: skipping\n"); + continue; + } + + seq_printf(s, "%08zu\t%08x\t%08x\t%08ld\t%s\n", + buf_obj->size, + buf_obj->file->f_flags, buf_obj->file->f_mode, + (long)(buf_obj->file->f_count.counter), + buf_obj->exp_name); + + seq_puts(s, "\tAttached Devices:\n"); + attach_count = 0; + + list_for_each_entry(attach_obj, &buf_obj->attachments, node) { + seq_puts(s, "\t"); + + seq_printf(s, "%s\n", dev_name(attach_obj->dev)); + attach_count++; + } + + seq_printf(s, "Total %d devices attached\n\n", + attach_count); + + count++; + size += buf_obj->size; + mutex_unlock(&buf_obj->lock); + } + + seq_printf(s, "\nTotal %d objects, %zu bytes\n", count, size); + + mutex_unlock(&db_list.lock); + return 0; +} + +static int dma_buf_show(struct seq_file *s, void *unused) +{ + void (*func)(struct seq_file *) = s->private; + func(s); + return 0; +} + +static int dma_buf_debug_open(struct inode *inode, struct file *file) +{ + return single_open(file, dma_buf_show, inode->i_private); +} + +static const struct file_operations dma_buf_debug_fops = { + .open = dma_buf_debug_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static struct dentry *dma_buf_debugfs_dir; + +static int dma_buf_init_debugfs(void) +{ + int err = 0; + dma_buf_debugfs_dir = debugfs_create_dir("dma_buf", NULL); + if (IS_ERR(dma_buf_debugfs_dir)) { + err = PTR_ERR(dma_buf_debugfs_dir); + dma_buf_debugfs_dir = NULL; + return err; + } + + err = dma_buf_debugfs_create_file("bufinfo", dma_buf_describe); + + if (err) + pr_debug("dma_buf: debugfs: failed to create node bufinfo\n"); + + return err; +} + +static void dma_buf_uninit_debugfs(void) +{ + if (dma_buf_debugfs_dir) + debugfs_remove_recursive(dma_buf_debugfs_dir); +} + +int dma_buf_debugfs_create_file(const char *name, + int (*write)(struct seq_file *)) +{ + struct dentry *d; + + d = debugfs_create_file(name, S_IRUGO, dma_buf_debugfs_dir, + write, &dma_buf_debug_fops); + + return PTR_ERR_OR_ZERO(d); +} +#else +static inline int dma_buf_init_debugfs(void) +{ + return 0; +} +static inline void dma_buf_uninit_debugfs(void) +{ +} +#endif + +static int __init dma_buf_init(void) +{ + mutex_init(&db_list.lock); + INIT_LIST_HEAD(&db_list.head); + dma_buf_init_debugfs(); + return 0; +} +subsys_initcall(dma_buf_init); + +static void __exit dma_buf_deinit(void) +{ + dma_buf_uninit_debugfs(); +} +__exitcall(dma_buf_deinit); diff --git a/drivers/dma-buf/reservation.c b/drivers/dma-buf/reservation.c new file mode 100644 index 000000000000..a73fbf3b8e56 --- /dev/null +++ b/drivers/dma-buf/reservation.c @@ -0,0 +1,39 @@ +/* + * Copyright (C) 2012-2013 Canonical Ltd + * + * Based on bo.c which bears the following copyright notice, + * but is dual licensed: + * + * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA + * All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sub license, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice (including the + * next paragraph) shall be included in all copies or substantial portions + * of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, + * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR + * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE + * USE OR OTHER DEALINGS IN THE SOFTWARE. + * + **************************************************************************/ +/* + * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com> + */ + +#include <linux/reservation.h> +#include <linux/export.h> + +DEFINE_WW_CLASS(reservation_ww_class); +EXPORT_SYMBOL(reservation_ww_class);

[v2,1/9] dma-buf: move to drivers/dma-buf

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