diff options
Diffstat (limited to 'drivers')
35 files changed, 2050 insertions, 774 deletions
diff --git a/drivers/Makefile b/drivers/Makefile index 54bfae1f09a4..ebee55537a05 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-$(CONFIG_IDE) += ide/ diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig index 23b8726962af..88500fed3c7a 100644 --- a/drivers/base/Kconfig +++ b/drivers/base/Kconfig @@ -149,15 +149,21 @@ config EXTRA_FIRMWARE_DIR some other directory containing the firmware files. config FW_LOADER_USER_HELPER + bool + +config FW_LOADER_USER_HELPER_FALLBACK bool "Fallback user-helper invocation for firmware loading" depends on FW_LOADER - default y + select FW_LOADER_USER_HELPER help This option enables / disables the invocation of user-helper (e.g. udev) for loading firmware files as a fallback after the direct file loading in kernel fails. The user-mode helper is no longer required unless you have a special firmware file that - resides in a non-standard path. + resides in a non-standard path. Moreover, the udev support has + been deprecated upstream. + + If you are unsure about this, say N here. config DEBUG_DRIVER bool "Driver Core verbose debug messages" @@ -208,6 +214,15 @@ config DMA_SHARED_BUFFER APIs extension; the file's descriptor can then be passed on to other driver. +config FENCE_TRACE + bool "Enable verbose FENCE_TRACE messages" + depends on DMA_SHARED_BUFFER + help + Enable the FENCE_TRACE printks. This will add extra + spam to the console log, but will make it easier to diagnose + lockup related problems for dma-buffers shared across multiple + devices. + config DMA_CMA bool "DMA Contiguous Memory Allocator" depends on HAVE_DMA_CONTIGUOUS && CMA diff --git a/drivers/base/Makefile b/drivers/base/Makefile index 04b314e0fa51..4aab26ec0292 100644 --- a/drivers/base/Makefile +++ b/drivers/base/Makefile @@ -10,7 +10,6 @@ obj-$(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/firmware_class.c b/drivers/base/firmware_class.c index d276e33880be..da77791793f1 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) { @@ -911,7 +906,9 @@ static int _request_firmware_load(struct firmware_priv *fw_priv, wait_for_completion(&buf->completion); cancel_delayed_work_sync(&fw_priv->timeout_work); - if (!buf->data) + if (is_fw_load_aborted(buf)) + retval = -EAGAIN; + else if (!buf->data) retval = -ENOMEM; device_remove_file(f_dev, &dev_attr_loading); @@ -1111,10 +1108,11 @@ _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 +1169,6 @@ 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 +1185,12 @@ 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 +1274,7 @@ 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 00f2208949d1..ab4f4ce02722 100644 --- a/drivers/base/platform.c +++ b/drivers/base/platform.c @@ -24,6 +24,7 @@ #include <linux/idr.h> #include <linux/acpi.h> #include <linux/clk/clk-conf.h> +#include <linux/limits.h> #include "base.h" #include "power/power.h" @@ -176,7 +177,7 @@ EXPORT_SYMBOL_GPL(platform_add_devices); struct platform_object { struct platform_device pdev; - char name[1]; + char name[]; }; /** @@ -202,6 +203,7 @@ 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); } @@ -217,7 +219,7 @@ 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; @@ -713,8 +715,49 @@ 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); @@ -770,6 +813,10 @@ 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); diff --git a/drivers/bus/brcmstb_gisb.c b/drivers/bus/brcmstb_gisb.c index 6159b7752a64..f2cd6a2d40b4 100644 --- a/drivers/bus/brcmstb_gisb.c +++ b/drivers/bus/brcmstb_gisb.c @@ -212,9 +212,9 @@ static int brcmstb_gisb_arb_probe(struct platform_device *pdev) mutex_init(&gdev->lock); INIT_LIST_HEAD(&gdev->next); - gdev->base = devm_request_and_ioremap(&pdev->dev, r); - if (!gdev->base) - return -ENOMEM; + gdev->base = devm_ioremap_resource(&pdev->dev, r); + if (IS_ERR(gdev->base)) + return PTR_ERR(gdev->base); err = devm_request_irq(&pdev->dev, timeout_irq, brcmstb_gisb_timeout_handler, 0, pdev->name, diff --git a/drivers/dma-buf/Makefile b/drivers/dma-buf/Makefile new file mode 100644 index 000000000000..57a675f90cd0 --- /dev/null +++ b/drivers/dma-buf/Makefile @@ -0,0 +1 @@ +obj-y := dma-buf.o fence.o reservation.o seqno-fence.o diff --git a/drivers/base/dma-buf.c b/drivers/dma-buf/dma-buf.c index 840c7fa80983..f3014c448e1e 100644 --- a/drivers/base/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -25,10 +25,13 @@ #include <linux/fs.h> #include <linux/slab.h> #include <linux/dma-buf.h> +#include <linux/fence.h> #include <linux/anon_inodes.h> #include <linux/export.h> #include <linux/debugfs.h> #include <linux/seq_file.h> +#include <linux/poll.h> +#include <linux/reservation.h> static inline int is_dma_buf_file(struct file *); @@ -50,12 +53,25 @@ static int dma_buf_release(struct inode *inode, struct file *file) BUG_ON(dmabuf->vmapping_counter); + /* + * Any fences that a dma-buf poll can wait on should be signaled + * before releasing dma-buf. This is the responsibility of each + * driver that uses the reservation objects. + * + * If you hit this BUG() it means someone dropped their ref to the + * dma-buf while still having pending operation to the buffer. + */ + BUG_ON(dmabuf->cb_shared.active || dmabuf->cb_excl.active); + dmabuf->ops->release(dmabuf); mutex_lock(&db_list.lock); list_del(&dmabuf->list_node); mutex_unlock(&db_list.lock); + if (dmabuf->resv == (struct reservation_object *)&dmabuf[1]) + reservation_object_fini(dmabuf->resv); + kfree(dmabuf); return 0; } @@ -103,10 +119,141 @@ static loff_t dma_buf_llseek(struct file *file, loff_t offset, int whence) return base + offset; } +static void dma_buf_poll_cb(struct fence *fence, struct fence_cb *cb) +{ + struct dma_buf_poll_cb_t *dcb = (struct dma_buf_poll_cb_t *)cb; + unsigned long flags; + + spin_lock_irqsave(&dcb->poll->lock, flags); + wake_up_locked_poll(dcb->poll, dcb->active); + dcb->active = 0; + spin_unlock_irqrestore(&dcb->poll->lock, flags); +} + +static unsigned int dma_buf_poll(struct file *file, poll_table *poll) +{ + struct dma_buf *dmabuf; + struct reservation_object *resv; + struct reservation_object_list *fobj; + struct fence *fence_excl; + unsigned long events; + unsigned shared_count, seq; + + dmabuf = file->private_data; + if (!dmabuf || !dmabuf->resv) + return POLLERR; + + resv = dmabuf->resv; + + poll_wait(file, &dmabuf->poll, poll); + + events = poll_requested_events(poll) & (POLLIN | POLLOUT); + if (!events) + return 0; + +retry: + seq = read_seqcount_begin(&resv->seq); + rcu_read_lock(); + + fobj = rcu_dereference(resv->fence); + if (fobj) + shared_count = fobj->shared_count; + else + shared_count = 0; + fence_excl = rcu_dereference(resv->fence_excl); + if (read_seqcount_retry(&resv->seq, seq)) { + rcu_read_unlock(); + goto retry; + } + + if (fence_excl && (!(events & POLLOUT) || shared_count == 0)) { + struct dma_buf_poll_cb_t *dcb = &dmabuf->cb_excl; + unsigned long pevents = POLLIN; + + if (shared_count == 0) + pevents |= POLLOUT; + + spin_lock_irq(&dmabuf->poll.lock); + if (dcb->active) { + dcb->active |= pevents; + events &= ~pevents; + } else + dcb->active = pevents; + spin_unlock_irq(&dmabuf->poll.lock); + + if (events & pevents) { + if (!fence_get_rcu(fence_excl)) { + /* force a recheck */ + events &= ~pevents; + dma_buf_poll_cb(NULL, &dcb->cb); + } else if (!fence_add_callback(fence_excl, &dcb->cb, + dma_buf_poll_cb)) { + events &= ~pevents; + fence_put(fence_excl); + } else { + /* + * No callback queued, wake up any additional + * waiters. + */ + fence_put(fence_excl); + dma_buf_poll_cb(NULL, &dcb->cb); + } + } + } + + if ((events & POLLOUT) && shared_count > 0) { + struct dma_buf_poll_cb_t *dcb = &dmabuf->cb_shared; + int i; + + /* Only queue a new callback if no event has fired yet */ + spin_lock_irq(&dmabuf->poll.lock); + if (dcb->active) + events &= ~POLLOUT; + else + dcb->active = POLLOUT; + spin_unlock_irq(&dmabuf->poll.lock); + + if (!(events & POLLOUT)) + goto out; + + for (i = 0; i < shared_count; ++i) { + struct fence *fence = rcu_dereference(fobj->shared[i]); + + if (!fence_get_rcu(fence)) { + /* + * fence refcount dropped to zero, this means + * that fobj has been freed + * + * call dma_buf_poll_cb and force a recheck! + */ + events &= ~POLLOUT; + dma_buf_poll_cb(NULL, &dcb->cb); + break; + } + if (!fence_add_callback(fence, &dcb->cb, + dma_buf_poll_cb)) { + fence_put(fence); + events &= ~POLLOUT; + break; + } + fence_put(fence); + } + + /* No callback queued, wake up any additional waiters. */ + if (i == shared_count) + dma_buf_poll_cb(NULL, &dcb->cb); + } + +out: + rcu_read_unlock(); + return events; +} + static const struct file_operations dma_buf_fops = { .release = dma_buf_release, .mmap = dma_buf_mmap_internal, .llseek = dma_buf_llseek, + .poll = dma_buf_poll, }; /* @@ -128,6 +275,7 @@ static inline int is_dma_buf_file(struct file *file) * @size: [in] Size of the buffer * @flags: [in] mode flags for the file. * @exp_name: [in] name of the exporting module - useful for debugging. + * @resv: [in] reservation-object, NULL to allocate default one. * * Returns, on success, a newly created dma_buf object, which wraps the * supplied private data and operations for dma_buf_ops. On either missing @@ -135,10 +283,17 @@ static inline int is_dma_buf_file(struct file *file) * */ struct dma_buf *dma_buf_export_named(void *priv, const struct dma_buf_ops *ops, - size_t size, int flags, const char *exp_name) + size_t size, int flags, const char *exp_name, + struct reservation_object *resv) { struct dma_buf *dmabuf; struct file *file; + size_t alloc_size = sizeof(struct dma_buf); + if (!resv) + alloc_size += sizeof(struct reservation_object); + else + /* prevent &dma_buf[1] == dma_buf->resv */ + alloc_size += 1; if (WARN_ON(!priv || !ops |