diff options
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/Kconfig | 19 | ||||
| -rw-r--r-- | drivers/base/Makefile | 1 | ||||
| -rw-r--r-- | drivers/base/component.c | 192 | ||||
| -rw-r--r-- | drivers/base/dma-buf.c | 743 | ||||
| -rw-r--r-- | drivers/base/firmware_class.c | 43 | ||||
| -rw-r--r-- | drivers/base/platform.c | 51 | ||||
| -rw-r--r-- | drivers/base/reservation.c | 39 |
7 files changed, 242 insertions, 846 deletions
diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig index 23b8726962af..88500fed3c7a 100644 --- a/drivers/base/Kconfig +++ b/drivers/base/Kconfig @@ -149,15 +149,21 @@ config EXTRA_FIRMWARE_DIR some other directory containing the firmware files. config FW_LOADER_USER_HELPER + bool + +config FW_LOADER_USER_HELPER_FALLBACK bool "Fallback user-helper invocation for firmware loading" depends on FW_LOADER - default y + select FW_LOADER_USER_HELPER help This option enables / disables the invocation of user-helper (e.g. udev) for loading firmware files as a fallback after the direct file loading in kernel fails. The user-mode helper is no longer required unless you have a special firmware file that - resides in a non-standard path. + resides in a non-standard path. Moreover, the udev support has + been deprecated upstream. + + If you are unsure about this, say N here. config DEBUG_DRIVER bool "Driver Core verbose debug messages" @@ -208,6 +214,15 @@ config DMA_SHARED_BUFFER APIs extension; the file's descriptor can then be passed on to other driver. +config FENCE_TRACE + bool "Enable verbose FENCE_TRACE messages" + depends on DMA_SHARED_BUFFER + help + Enable the FENCE_TRACE printks. This will add extra + spam to the console log, but will make it easier to diagnose + lockup related problems for dma-buffers shared across multiple + devices. + config DMA_CMA bool "DMA Contiguous Memory Allocator" depends on HAVE_DMA_CONTIGUOUS && CMA 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/component.c b/drivers/base/component.c index c4778995cd72..f748430bb654 100644 --- a/drivers/base/component.c +++ b/drivers/base/component.c @@ -18,6 +18,15 @@ #include <linux/mutex.h> #include <linux/slab.h> +struct component_match { + size_t alloc; + size_t num; + struct { + void *data; + int (*fn)(struct device *, void *); + } compare[0]; +}; + struct master { struct list_head node; struct list_head components; @@ -25,6 +34,7 @@ struct master { const struct component_master_ops *ops; struct device *dev; + struct component_match *match; }; struct component { @@ -69,6 +79,11 @@ static void component_detach_master(struct master *master, struct component *c) c->master = NULL; } +/* + * Add a component to a master, finding the component via the compare + * function and compare data. This is safe to call for duplicate matches + * and will not result in the same component being added multiple times. + */ int component_master_add_child(struct master *master, int (*compare)(struct device *, void *), void *compare_data) { @@ -76,11 +91,12 @@ int component_master_add_child(struct master *master, int ret = -ENXIO; list_for_each_entry(c, &component_list, node) { - if (c->master) + if (c->master && c->master != master) continue; if (compare(c->dev, compare_data)) { - component_attach_master(master, c); + if (!c->master) + component_attach_master(master, c); ret = 0; break; } @@ -90,6 +106,34 @@ int component_master_add_child(struct master *master, } EXPORT_SYMBOL_GPL(component_master_add_child); +static int find_components(struct master *master) +{ + struct component_match *match = master->match; + size_t i; + int ret = 0; + + if (!match) { + /* + * Search the list of components, looking for components that + * belong to this master, and attach them to the master. + */ + return master->ops->add_components(master->dev, master); + } + + /* + * Scan the array of match functions and attach + * any components which are found to this master. + */ + for (i = 0; i < match->num; i++) { + ret = component_master_add_child(master, + match->compare[i].fn, + match->compare[i].data); + if (ret) + break; + } + return ret; +} + /* Detach all attached components from this master */ static void master_remove_components(struct master *master) { @@ -113,44 +157,44 @@ static void master_remove_components(struct master *master) static int try_to_bring_up_master(struct master *master, struct component *component) { - int ret = 0; + int ret; - if (!master->bound) { - /* - * Search the list of components, looking for components that - * belong to this master, and attach them to the master. - */ - if (master->ops->add_components(master->dev, master)) { - /* Failed to find all components */ - master_remove_components(master); - ret = 0; - goto out; - } + if (master->bound) + return 0; - if (component && component->master != master) { - master_remove_components(master); - ret = 0; - goto out; - } + /* + * Search the list of components, looking for components that + * belong to this master, and attach them to the master. + */ + if (find_components(master)) { + /* Failed to find all components */ + ret = 0; + goto out; + } - if (!devres_open_group(master->dev, NULL, GFP_KERNEL)) { - ret = -ENOMEM; - goto out; - } + if (component && component->master != master) { + ret = 0; + goto out; + } - /* Found all components */ - ret = master->ops->bind(master->dev); - if (ret < 0) { - devres_release_group(master->dev, NULL); - dev_info(master->dev, "master bind failed: %d\n", ret); - master_remove_components(master); - goto out; - } + if (!devres_open_group(master->dev, NULL, GFP_KERNEL)) { + ret = -ENOMEM; + goto out; + } - master->bound = true; - ret = 1; + /* Found all components */ + ret = master->ops->bind(master->dev); + if (ret < 0) { + devres_release_group(master->dev, NULL); + dev_info(master->dev, "master bind failed: %d\n", ret); + goto out; } + + master->bound = true; + return 1; + out: + master_remove_components(master); return ret; } @@ -180,18 +224,89 @@ static void take_down_master(struct master *master) master_remove_components(master); } -int component_master_add(struct device *dev, - const struct component_master_ops *ops) +static size_t component_match_size(size_t num) +{ + return offsetof(struct component_match, compare[num]); +} + +static struct component_match *component_match_realloc(struct device *dev, + struct component_match *match, size_t num) +{ + struct component_match *new; + + if (match && match->alloc == num) + return match; + + new = devm_kmalloc(dev, component_match_size(num), GFP_KERNEL); + if (!new) + return ERR_PTR(-ENOMEM); + + if (match) { + memcpy(new, match, component_match_size(min(match->num, num))); + devm_kfree(dev, match); + } else { + new->num = 0; + } + + new->alloc = num; + + return new; +} + +/* + * Add a component to be matched. + * + * The match array is first created or extended if necessary. + */ +void component_match_add(struct device *dev, struct component_match **matchptr, + int (*compare)(struct device *, void *), void *compare_data) +{ + struct component_match *match = *matchptr; + + if (IS_ERR(match)) + return; + + if (!match || match->num == match->alloc) { + size_t new_size = match ? match->alloc + 16 : 15; + + match = component_match_realloc(dev, match, new_size); + + *matchptr = match; + + if (IS_ERR(match)) + return; + } + + match->compare[match->num].fn = compare; + match->compare[match->num].data = compare_data; + match->num++; +} +EXPORT_SYMBOL(component_match_add); + +int component_master_add_with_match(struct device *dev, + const struct component_master_ops *ops, + struct component_match *match) { struct master *master; int ret; + if (ops->add_components && match) + return -EINVAL; + + if (match) { + /* Reallocate the match array for its true size */ + match = component_match_realloc(dev, match, match->num); + if (IS_ERR(match)) + return PTR_ERR(match); + } + master = kzalloc(sizeof(*master), GFP_KERNEL); if (!master) return -ENOMEM; master->dev = dev; master->ops = ops; + master->match = match; INIT_LIST_HEAD(&master->components); /* Add to the list of available masters. */ @@ -209,6 +324,13 @@ int component_master_add(struct device *dev, return ret < 0 ? ret : 0; } +EXPORT_SYMBOL_GPL(component_master_add_with_match); + +int component_master_add(struct device *dev, + const struct component_master_ops *ops) +{ + return component_master_add_with_match(dev, ops, NULL); +} EXPORT_SYMBOL_GPL(component_master_add); void component_master_del(struct device *dev, 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/firmware_class.c b/drivers/base/firmware_class.c index d276e33880be..124d50ceb116 100644 --- a/drivers/base/firmware_class.c +++ b/drivers/base/firmware_class.c @@ -100,10 +100,16 @@ static inline long firmware_loading_timeout(void) #define FW_OPT_UEVENT (1U << 0) #define FW_OPT_NOWAIT (1U << 1) #ifdef CONFIG_FW_LOADER_USER_HELPER -#define FW_OPT_FALLBACK (1U << 2) +#define FW_OPT_USERHELPER (1U << 2) #else -#define FW_OPT_FALLBACK 0 +#define FW_OPT_USERHELPER 0 #endif +#ifdef CONFIG_FW_LOADER_USER_HELPER_FALLBACK +#define FW_OPT_FALLBACK FW_OPT_USERHELPER +#else +#define FW_OPT_FALLBACK 0 +#endif +#define FW_OPT_NO_WARN (1U << 3) struct firmware_cache { /* firmware_buf instance will be added into the below list */ @@ -279,26 +285,15 @@ static const char * const fw_path[] = { module_param_string(path, fw_path_para, sizeof(fw_path_para), 0644); MODULE_PARM_DESC(path, "customized firmware image search path with a higher priority than default path"); -/* Don't inline this: 'struct kstat' is biggish */ -static noinline_for_stack int fw_file_size(struct file *file) -{ - struct kstat st; - if (vfs_getattr(&file->f_path, &st)) - return -1; - if (!S_ISREG(st.mode)) - return -1; - if (st.size != (int)st.size) - return -1; - return st.size; -} - static int fw_read_file_contents(struct file *file, struct firmware_buf *fw_buf) { int size; char *buf; int rc; - size = fw_file_size(file); + if (!S_ISREG(file_inode(file)->i_mode)) + return -EINVAL; + size = i_size_read(file_inode(file)); if (size <= 0) return -EINVAL; buf = vmalloc(size); @@ -718,7 +713,7 @@ out: static int fw_realloc_buffer(struct firmware_priv *fw_priv, int min_size) { struct firmware_buf *buf = fw_priv->buf; - int pages_needed = ALIGN(min_size, PAGE_SIZE) >> PAGE_SHIFT; + int pages_needed = PAGE_ALIGN(min_size) >> PAGE_SHIFT; /* If the array of pages is too small, grow it... */ if (buf->page_array_size < pages_needed) { @@ -1111,10 +1106,11 @@ _request_firmware(const struct firmware **firmware_p, const char *name, ret = fw_get_filesystem_firmware(device, fw->priv); if (ret) { - if (opt_flags & FW_OPT_FALLBACK) { + if (!(opt_flags & FW_OPT_NO_WARN)) dev_warn(device, - "Direct firmware load failed with error %d\n", - ret); + "Direct firmware load for %s failed with error %d\n", + name, ret); + if (opt_flags & FW_OPT_USERHELPER) { dev_warn(device, "Falling back to user helper\n"); ret = fw_load_from_user_helper(fw, name, device, opt_flags, timeout); @@ -1171,7 +1167,6 @@ request_firmware(const struct firmware **firmware_p, const char *name, } EXPORT_SYMBOL(request_firmware); -#ifdef CONFIG_FW_LOADER_USER_HELPER /** * request_firmware: - load firmware directly without usermode helper * @firmware_p: pointer to firmware image @@ -1188,12 +1183,12 @@ int request_firmware_direct(const struct firmware **firmware_p, { int ret; __module_get(THIS_MODULE); - ret = _request_firmware(firmware_p, name, device, FW_OPT_UEVENT); + ret = _request_firmware(firmware_p, name, device, + FW_OPT_UEVENT | FW_OPT_NO_WARN); module_put(THIS_MODULE); return ret; } EXPORT_SYMBOL_GPL(request_firmware_direct); -#endif /** * release_firmware: - release the resource associated with a firmware image @@ -1277,7 +1272,7 @@ request_firmware_nowait( fw_work->context = context; fw_work->cont = cont; fw_work->opt_flags = FW_OPT_NOWAIT | FW_OPT_FALLBACK | - (uevent ? FW_OPT_UEVENT : 0); + (uevent ? FW_OPT_UEVENT : FW_OPT_USERHELPER); if (!try_module_get(module)) { kfree(fw_work); diff --git a/drivers/base/platform.c b/drivers/base/platform.c index eee48c49f5de..7cc7440b014d 100644 --- a/drivers/base/platform.c +++ b/drivers/base/platform.c @@ -23,6 +23,7 @@ #include <linux/pm_runtime.h> #include <linux/idr.h> #include <linux/acpi.h> +#include <linux/limits.h> #include "base.h" #include "power/power.h" @@ -175,7 +176,7 @@ EXPORT_SYMBOL_GPL(platform_add_devices); struct platform_object { struct platform_device pdev; - char name[1]; + char name[]; }; /** @@ -201,6 +202,7 @@ static void platform_device_release(struct device *dev) kfree(pa->pdev.dev.platform_data); kfree(pa->pdev.mfd_cell); kfree(pa->pdev.resource); + kfree(pa->pdev.driver_override); kfree(pa); } @@ -216,7 +218,7 @@ struct platform_device *platform_device_alloc(const char *name, int id) { struct platform_object *pa; - pa = kzalloc(sizeof(struct platform_object) + strlen(name), GFP_KERNEL); + pa = kzalloc(sizeof(*pa) + strlen(name) + 1, GFP_KERNEL); if (pa) { strcpy(pa->name, name); pa->pdev.name = pa->name; @@ -708,8 +710,49 @@ static ssize_t modalias_show(struct device *dev, struct device_attribute *a, } static DEVICE_ATTR_RO(modalias); +static ssize_t driver_override_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct platform_device *pdev = to_platform_device(dev); + char *driver_override, *old = pdev->driver_override, *cp; + + if (count > PATH_MAX) + return -EINVAL; + + driver_override = kstrndup(buf, count, GFP_KERNEL); + if (!driver_override) + return -ENOMEM; + + cp = strchr(driver_override, '\n'); + if (cp) + *cp = '\0'; + + if (strlen(driver_override)) { + pdev->driver_override = driver_override; + } else { + kfree(driver_override); + pdev->driver_override = NULL; + } + + kfree(old); + + return count; +} + +static ssize_t driver_override_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct platform_device *pdev = to_platform_device(dev); + + return sprintf(buf, "%s\n", pdev->driver_override); +} +static DEVICE_ATTR_RW(driver_override); + + static struct attribute *platform_dev_attrs[] = { &dev_attr_modalias.attr, + &dev_attr_driver_override.attr, NULL, }; ATTRIBUTE_GROUPS(platform_dev); @@ -765,6 +808,10 @@ static int platform_match(struct device *dev, struct device_driver *drv) struct platform_device *pdev = to_platform_device(dev); struct platform_driver *pdrv = to_platform_driver(drv); + /* When driver_override is set, only bind to the matching driver */ + if (pdev->driver_override) + return !strcmp(pdev->driver_override, drv->name); + /* Attempt an OF style match first */ if (of_driver_match_device(dev, drv)) return 1; 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); |