From: Daniel Vetter Date: Wed, 8 Mar 2017 14:12:40 +0000 (+0100) Subject: drm: rename drm_fops.c to drm_file.c X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9acdac68bcdc8c186353e5575a872465e103de74;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git drm: rename drm_fops.c to drm_file.c It's not just file ops, but drm_file stuff in general. This is prep work to extracting a drm_file.h header in the next patch. Reviewed-by: Gustavo Padovan Signed-off-by: Daniel Vetter Link: http://patchwork.freedesktop.org/patch/msgid/20170308141257.12119-8-daniel.vetter@ffwll.ch --- diff --git a/Documentation/gpu/drm-internals.rst b/Documentation/gpu/drm-internals.rst index e35920db1f4c..b00bf8229080 100644 --- a/Documentation/gpu/drm-internals.rst +++ b/Documentation/gpu/drm-internals.rst @@ -298,10 +298,10 @@ over. File Operations --------------- -.. kernel-doc:: drivers/gpu/drm/drm_fops.c +.. kernel-doc:: drivers/gpu/drm/drm_file.c :doc: file operations -.. kernel-doc:: drivers/gpu/drm/drm_fops.c +.. kernel-doc:: drivers/gpu/drm/drm_file.c :export: IOCTLs diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile index 3ee95793d122..eb54ffabacc5 100644 --- a/drivers/gpu/drm/Makefile +++ b/drivers/gpu/drm/Makefile @@ -4,7 +4,7 @@ drm-y := drm_auth.o drm_bufs.o drm_cache.o \ drm_context.o drm_dma.o \ - drm_fops.o drm_gem.o drm_ioctl.o drm_irq.o \ + drm_file.o drm_gem.o drm_ioctl.o drm_irq.o \ drm_lock.o drm_memory.o drm_drv.o \ drm_scatter.o drm_pci.o \ drm_platform.o drm_sysfs.o drm_hashtab.o drm_mm.o \ diff --git a/drivers/gpu/drm/drm_file.c b/drivers/gpu/drm/drm_file.c new file mode 100644 index 000000000000..83e8c96ec4ab --- /dev/null +++ b/drivers/gpu/drm/drm_file.c @@ -0,0 +1,734 @@ +/* + * \author Rickard E. (Rik) Faith + * \author Daryll Strauss + * \author Gareth Hughes + */ + +/* + * Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com + * + * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. + * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. + * 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, sublicense, + * 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 NONINFRINGEMENT. IN NO EVENT SHALL + * VA LINUX SYSTEMS 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. + */ + +#include +#include +#include +#include +#include "drm_legacy.h" +#include "drm_internal.h" +#include "drm_crtc_internal.h" + +/* from BKL pushdown */ +DEFINE_MUTEX(drm_global_mutex); + +/** + * DOC: file operations + * + * Drivers must define the file operations structure that forms the DRM + * userspace API entry point, even though most of those operations are + * implemented in the DRM core. The mandatory functions are drm_open(), + * drm_read(), drm_ioctl() and drm_compat_ioctl() if CONFIG_COMPAT is enabled + * (note that drm_compat_ioctl will be NULL if CONFIG_COMPAT=n). Drivers which + * implement private ioctls that require 32/64 bit compatibility support must + * provide their own .compat_ioctl() handler that processes private ioctls and + * calls drm_compat_ioctl() for core ioctls. + * + * In addition drm_read() and drm_poll() provide support for DRM events. DRM + * events are a generic and extensible means to send asynchronous events to + * userspace through the file descriptor. They are used to send vblank event and + * page flip completions by the KMS API. But drivers can also use it for their + * own needs, e.g. to signal completion of rendering. + * + * The memory mapping implementation will vary depending on how the driver + * manages memory. Legacy drivers will use the deprecated drm_legacy_mmap() + * function, modern drivers should use one of the provided memory-manager + * specific implementations. For GEM-based drivers this is drm_gem_mmap(). + * + * No other file operations are supported by the DRM userspace API. Overall the + * following is an example #file_operations structure:: + * + * static const example_drm_fops = { + * .owner = THIS_MODULE, + * .open = drm_open, + * .release = drm_release, + * .unlocked_ioctl = drm_ioctl, + * .compat_ioctl = drm_compat_ioctl, // NULL if CONFIG_COMPAT=n + * .poll = drm_poll, + * .read = drm_read, + * .llseek = no_llseek, + * .mmap = drm_gem_mmap, + * }; + */ + +static int drm_open_helper(struct file *filp, struct drm_minor *minor); + +static int drm_setup(struct drm_device * dev) +{ + int ret; + + if (dev->driver->firstopen && + drm_core_check_feature(dev, DRIVER_LEGACY)) { + ret = dev->driver->firstopen(dev); + if (ret != 0) + return ret; + } + + ret = drm_legacy_dma_setup(dev); + if (ret < 0) + return ret; + + + DRM_DEBUG("\n"); + return 0; +} + +/** + * drm_open - open method for DRM file + * @inode: device inode + * @filp: file pointer. + * + * This function must be used by drivers as their .open() #file_operations + * method. It looks up the correct DRM device and instantiates all the per-file + * resources for it. + * + * RETURNS: + * + * 0 on success or negative errno value on falure. + */ +int drm_open(struct inode *inode, struct file *filp) +{ + struct drm_device *dev; + struct drm_minor *minor; + int retcode; + int need_setup = 0; + + minor = drm_minor_acquire(iminor(inode)); + if (IS_ERR(minor)) + return PTR_ERR(minor); + + dev = minor->dev; + if (!dev->open_count++) + need_setup = 1; + + /* share address_space across all char-devs of a single device */ + filp->f_mapping = dev->anon_inode->i_mapping; + + retcode = drm_open_helper(filp, minor); + if (retcode) + goto err_undo; + if (need_setup) { + retcode = drm_setup(dev); + if (retcode) + goto err_undo; + } + return 0; + +err_undo: + dev->open_count--; + drm_minor_release(minor); + return retcode; +} +EXPORT_SYMBOL(drm_open); + +/* + * Check whether DRI will run on this CPU. + * + * \return non-zero if the DRI will run on this CPU, or zero otherwise. + */ +static int drm_cpu_valid(void) +{ +#if defined(__sparc__) && !defined(__sparc_v9__) + return 0; /* No cmpxchg before v9 sparc. */ +#endif + return 1; +} + +/* + * Called whenever a process opens /dev/drm. + * + * \param filp file pointer. + * \param minor acquired minor-object. + * \return zero on success or a negative number on failure. + * + * Creates and initializes a drm_file structure for the file private data in \p + * filp and add it into the double linked list in \p dev. + */ +static int drm_open_helper(struct file *filp, struct drm_minor *minor) +{ + struct drm_device *dev = minor->dev; + struct drm_file *priv; + int ret; + + if (filp->f_flags & O_EXCL) + return -EBUSY; /* No exclusive opens */ + if (!drm_cpu_valid()) + return -EINVAL; + if (dev->switch_power_state != DRM_SWITCH_POWER_ON && dev->switch_power_state != DRM_SWITCH_POWER_DYNAMIC_OFF) + return -EINVAL; + + DRM_DEBUG("pid = %d, minor = %d\n", task_pid_nr(current), minor->index); + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + filp->private_data = priv; + priv->filp = filp; + priv->pid = get_pid(task_pid(current)); + priv->minor = minor; + + /* for compatibility root is always authenticated */ + priv->authenticated = capable(CAP_SYS_ADMIN); + priv->lock_count = 0; + + INIT_LIST_HEAD(&priv->lhead); + INIT_LIST_HEAD(&priv->fbs); + mutex_init(&priv->fbs_lock); + INIT_LIST_HEAD(&priv->blobs); + INIT_LIST_HEAD(&priv->pending_event_list); + INIT_LIST_HEAD(&priv->event_list); + init_waitqueue_head(&priv->event_wait); + priv->event_space = 4096; /* set aside 4k for event buffer */ + + mutex_init(&priv->event_read_lock); + + if (drm_core_check_feature(dev, DRIVER_GEM)) + drm_gem_open(dev, priv); + + if (drm_core_check_feature(dev, DRIVER_PRIME)) + drm_prime_init_file_private(&priv->prime); + + if (dev->driver->open) { + ret = dev->driver->open(dev, priv); + if (ret < 0) + goto out_prime_destroy; + } + + if (drm_is_primary_client(priv)) { + ret = drm_master_open(priv); + if (ret) + goto out_close; + } + + mutex_lock(&dev->filelist_mutex); + list_add(&priv->lhead, &dev->filelist); + mutex_unlock(&dev->filelist_mutex); + +#ifdef __alpha__ + /* + * Default the hose + */ + if (!dev->hose) { + struct pci_dev *pci_dev; + pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL); + if (pci_dev) { + dev->hose = pci_dev->sysdata; + pci_dev_put(pci_dev); + } + if (!dev->hose) { + struct pci_bus *b = list_entry(pci_root_buses.next, + struct pci_bus, node); + if (b) + dev->hose = b->sysdata; + } + } +#endif + + return 0; + +out_close: + if (dev->driver->postclose) + dev->driver->postclose(dev, priv); +out_prime_destroy: + if (drm_core_check_feature(dev, DRIVER_PRIME)) + drm_prime_destroy_file_private(&priv->prime); + if (drm_core_check_feature(dev, DRIVER_GEM)) + drm_gem_release(dev, priv); + put_pid(priv->pid); + kfree(priv); + filp->private_data = NULL; + return ret; +} + +static void drm_events_release(struct drm_file *file_priv) +{ + struct drm_device *dev = file_priv->minor->dev; + struct drm_pending_event *e, *et; + unsigned long flags; + + spin_lock_irqsave(&dev->event_lock, flags); + + /* Unlink pending events */ + list_for_each_entry_safe(e, et, &file_priv->pending_event_list, + pending_link) { + list_del(&e->pending_link); + e->file_priv = NULL; + } + + /* Remove unconsumed events */ + list_for_each_entry_safe(e, et, &file_priv->event_list, link) { + list_del(&e->link); + kfree(e); + } + + spin_unlock_irqrestore(&dev->event_lock, flags); +} + +/* + * drm_legacy_dev_reinit + * + * Reinitializes a legacy/ums drm device in it's lastclose function. + */ +static void drm_legacy_dev_reinit(struct drm_device *dev) +{ + if (dev->irq_enabled) + drm_irq_uninstall(dev); + + mutex_lock(&dev->struct_mutex); + + drm_legacy_agp_clear(dev); + + drm_legacy_sg_cleanup(dev); + drm_legacy_vma_flush(dev); + drm_legacy_dma_takedown(dev); + + mutex_unlock(&dev->struct_mutex); + + dev->sigdata.lock = NULL; + + dev->context_flag = 0; + dev->last_context = 0; + dev->if_version = 0; + + DRM_DEBUG("lastclose completed\n"); +} + +/* + * Take down the DRM device. + * + * \param dev DRM device structure. + * + * Frees every resource in \p dev. + * + * \sa drm_device + */ +void drm_lastclose(struct drm_device * dev) +{ + DRM_DEBUG("\n"); + + if (dev->driver->lastclose) + dev->driver->lastclose(dev); + DRM_DEBUG("driver lastclose completed\n"); + + if (drm_core_check_feature(dev, DRIVER_LEGACY)) + drm_legacy_dev_reinit(dev); +} + +/** + * drm_release - release method for DRM file + * @inode: device inode + * @filp: file pointer. + * + * This function must be used by drivers as their .release() #file_operations + * method. It frees any resources associated with the open file, and if this is + * the last open file for the DRM device also proceeds to call drm_lastclose(). + * + * RETURNS: + * + * Always succeeds and returns 0. + */ +int drm_release(struct inode *inode, struct file *filp) +{ + struct drm_file *file_priv = filp->private_data; + struct drm_minor *minor = file_priv->minor; + struct drm_device *dev = minor->dev; + + mutex_lock(&drm_global_mutex); + + DRM_DEBUG("open_count = %d\n", dev->open_count); + + mutex_lock(&dev->filelist_mutex); + list_del(&file_priv->lhead); + mutex_unlock(&dev->filelist_mutex); + + if (dev->driver->preclose) + dev->driver->preclose(dev, file_priv); + + /* ======================================================== + * Begin inline drm_release + */ + + DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n", + task_pid_nr(current), + (long)old_encode_dev(file_priv->minor->kdev->devt), + dev->open_count); + + if (drm_core_check_feature(dev, DRIVER_LEGACY)) + drm_legacy_lock_release(dev, filp); + + if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) + drm_legacy_reclaim_buffers(dev, file_priv); + + drm_events_release(file_priv); + + if (drm_core_check_feature(dev, DRIVER_MODESET)) { + drm_fb_release(file_priv); + drm_property_destroy_user_blobs(dev, file_priv); + } + + if (drm_core_check_feature(dev, DRIVER_GEM)) + drm_gem_release(dev, file_priv); + + drm_legacy_ctxbitmap_flush(dev, file_priv); + + if (drm_is_primary_client(file_priv)) + drm_master_release(file_priv); + + if (dev->driver->postclose) + dev->driver->postclose(dev, file_priv); + + if (drm_core_check_feature(dev, DRIVER_PRIME)) + drm_prime_destroy_file_private(&file_priv->prime); + + WARN_ON(!list_empty(&file_priv->event_list)); + + put_pid(file_priv->pid); + kfree(file_priv); + + /* ======================================================== + * End inline drm_release + */ + + if (!--dev->open_count) { + drm_lastclose(dev); + if (drm_device_is_unplugged(dev)) + drm_put_dev(dev); + } + mutex_unlock(&drm_global_mutex); + + drm_minor_release(minor); + + return 0; +} +EXPORT_SYMBOL(drm_release); + +/** + * drm_read - read method for DRM file + * @filp: file pointer + * @buffer: userspace destination pointer for the read + * @count: count in bytes to read + * @offset: offset to read + * + * This function must be used by drivers as their .read() #file_operations + * method iff they use DRM events for asynchronous signalling to userspace. + * Since events are used by the KMS API for vblank and page flip completion this + * means all modern display drivers must use it. + * + * @offset is ignore, DRM events are read like a pipe. Therefore drivers also + * must set the .llseek() #file_operation to no_llseek(). Polling support is + * provided by drm_poll(). + * + * This function will only ever read a full event. Therefore userspace must + * supply a big enough buffer to fit any event to ensure forward progress. Since + * the maximum event space is currently 4K it's recommended to just use that for + * safety. + * + * RETURNS: + * + * Number of bytes read (always aligned to full events, and can be 0) or a + * negative error code on failure. + */ +ssize_t drm_read(struct file *filp, char __user *buffer, + size_t count, loff_t *offset) +{ + struct drm_file *file_priv = filp->private_data; + struct drm_device *dev = file_priv->minor->dev; + ssize_t ret; + + if (!access_ok(VERIFY_WRITE, buffer, count)) + return -EFAULT; + + ret = mutex_lock_interruptible(&file_priv->event_read_lock); + if (ret) + return ret; + + for (;;) { + struct drm_pending_event *e = NULL; + + spin_lock_irq(&dev->event_lock); + if (!list_empty(&file_priv->event_list)) { + e = list_first_entry(&file_priv->event_list, + struct drm_pending_event, link); + file_priv->event_space += e->event->length; + list_del(&e->link); + } + spin_unlock_irq(&dev->event_lock); + + if (e == NULL) { + if (ret) + break; + + if (filp->f_flags & O_NONBLOCK) { + ret = -EAGAIN; + break; + } + + mutex_unlock(&file_priv->event_read_lock); + ret = wait_event_interruptible(file_priv->event_wait, + !list_empty(&file_priv->event_list)); + if (ret >= 0) + ret = mutex_lock_interruptible(&file_priv->event_read_lock); + if (ret) + return ret; + } else { + unsigned length = e->event->length; + + if (length > count - ret) { +put_back_event: + spin_lock_irq(&dev->event_lock); + file_priv->event_space -= length; + list_add(&e->link, &file_priv->event_list); + spin_unlock_irq(&dev->event_lock); + break; + } + + if (copy_to_user(buffer + ret, e->event, length)) { + if (ret == 0) + ret = -EFAULT; + goto put_back_event; + } + + ret += length; + kfree(e); + } + } + mutex_unlock(&file_priv->event_read_lock); + + return ret; +} +EXPORT_SYMBOL(drm_read); + +/** + * drm_poll - poll method for DRM file + * @filp: file pointer + * @wait: poll waiter table + * + * This function must be used by drivers as their .read() #file_operations + * method iff they use DRM events for asynchronous signalling to userspace. + * Since events are used by the KMS API for vblank and page flip completion this + * means all modern display drivers must use it. + * + * See also drm_read(). + * + * RETURNS: + * + * Mask of POLL flags indicating the current status of the file. + */ +unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait) +{ + struct drm_file *file_priv = filp->private_data; + unsigned int mask = 0; + + poll_wait(filp, &file_priv->event_wait, wait); + + if (!list_empty(&file_priv->event_list)) + mask |= POLLIN | POLLRDNORM; + + return mask; +} +EXPORT_SYMBOL(drm_poll); + +/** + * drm_event_reserve_init_locked - init a DRM event and reserve space for it + * @dev: DRM device + * @file_priv: DRM file private data + * @p: tracking structure for the pending event + * @e: actual event data to deliver to userspace + * + * This function prepares the passed in event for eventual delivery. If the event + * doesn't get delivered (because the IOCTL fails later on, before queuing up + * anything) then the even must be cancelled and freed using + * drm_event_cancel_free(). Successfully initialized events should be sent out + * using drm_send_event() or drm_send_event_locked() to signal completion of the + * asynchronous event to userspace. + * + * If callers embedded @p into a larger structure it must be allocated with + * kmalloc and @p must be the first member element. + * + * This is the locked version of drm_event_reserve_init() for callers which + * already hold &drm_device.event_lock. + * + * RETURNS: + * + * 0 on success or a negative error code on failure. + */ +int drm_event_reserve_init_locked(struct drm_device *dev, + struct drm_file *file_priv, + struct drm_pending_event *p, + struct drm_event *e) +{ + if (file_priv->event_space < e->length) + return -ENOMEM; + + file_priv->event_space -= e->length; + + p->event = e; + list_add(&p->pending_link, &file_priv->pending_event_list); + p->file_priv = file_priv; + + return 0; +} +EXPORT_SYMBOL(drm_event_reserve_init_locked); + +/** + * drm_event_reserve_init - init a DRM event and reserve space for it + * @dev: DRM device + * @file_priv: DRM file private data + * @p: tracking structure for the pending event + * @e: actual event data to deliver to userspace + * + * This function prepares the passed in event for eventual delivery. If the event + * doesn't get delivered (because the IOCTL fails later on, before queuing up + * anything) then the even must be cancelled and freed using + * drm_event_cancel_free(). Successfully initialized events should be sent out + * using drm_send_event() or drm_send_event_locked() to signal completion of the + * asynchronous event to userspace. + * + * If callers embedded @p into a larger structure it must be allocated with + * kmalloc and @p must be the first member element. + * + * Callers which already hold &drm_device.event_lock should use + * drm_event_reserve_init_locked() instead. + * + * RETURNS: + * + * 0 on success or a negative error code on failure. + */ +int drm_event_reserve_init(struct drm_device *dev, + struct drm_file *file_priv, + struct drm_pending_event *p, + struct drm_event *e) +{ + unsigned long flags; + int ret; + + spin_lock_irqsave(&dev->event_lock, flags); + ret = drm_event_reserve_init_locked(dev, file_priv, p, e); + spin_unlock_irqrestore(&dev->event_lock, flags); + + return ret; +} +EXPORT_SYMBOL(drm_event_reserve_init); + +/** + * drm_event_cancel_free - free a DRM event and release it's space + * @dev: DRM device + * @p: tracking structure for the pending event + * + * This function frees the event @p initialized with drm_event_reserve_init() + * and releases any allocated space. + */ +void drm_event_cancel_free(struct drm_device *dev, + struct drm_pending_event *p) +{ + unsigned long flags; + spin_lock_irqsave(&dev->event_lock, flags); + if (p->file_priv) { + p->file_priv->event_space += p->event->length; + list_del(&p->pending_link); + } + spin_unlock_irqrestore(&dev->event_lock, flags); + + if (p->fence) + dma_fence_put(p->fence); + + kfree(p); +} +EXPORT_SYMBOL(drm_event_cancel_free); + +/** + * drm_send_event_locked - send DRM event to file descriptor + * @dev: DRM device + * @e: DRM event to deliver + * + * This function sends the event @e, initialized with drm_event_reserve_init(), + * to its associated userspace DRM file. Callers must already hold + * &drm_device.event_lock, see drm_send_event() for the unlocked version. + * + * Note that the core will take care of unlinking and disarming events when the + * corresponding DRM file is closed. Drivers need not worry about whether the + * DRM file for this event still exists and can call this function upon + * completion of the asynchronous work unconditionally. + */ +void drm_send_event_locked(struct drm_device *dev, struct drm_pending_event *e) +{ + assert_spin_locked(&dev->event_lock); + + if (e->completion) { + complete_all(e->completion); + e->completion_release(e->completion); + e->completion = NULL; + } + + if (e->fence) { + dma_fence_signal(e->fence); + dma_fence_put(e->fence); + } + + if (!e->file_priv) { + kfree(e); + return; + } + + list_del(&e->pending_link); + list_add_tail(&e->link, + &e->file_priv->event_list); + wake_up_interruptible(&e->file_priv->event_wait); +} +EXPORT_SYMBOL(drm_send_event_locked); + +/** + * drm_send_event - send DRM event to file descriptor + * @dev: DRM device + * @e: DRM event to deliver + * + * This function sends the event @e, initialized with drm_event_reserve_init(), + * to its associated userspace DRM file. This function acquires + * &drm_device.event_lock, see drm_send_event_locked() for callers which already + * hold this lock. + * + * Note that the core will take care of unlinking and disarming events when the + * corresponding DRM file is closed. Drivers need not worry about whether the + * DRM file for this event still exists and can call this function upon + * completion of the asynchronous work unconditionally. + */ +void drm_send_event(struct drm_device *dev, struct drm_pending_event *e) +{ + unsigned long irqflags; + + spin_lock_irqsave(&dev->event_lock, irqflags); + drm_send_event_locked(dev, e); + spin_unlock_irqrestore(&dev->event_lock, irqflags); +} +EXPORT_SYMBOL(drm_send_event); diff --git a/drivers/gpu/drm/drm_fops.c b/drivers/gpu/drm/drm_fops.c deleted file mode 100644 index afdf5b147f39..000000000000 --- a/drivers/gpu/drm/drm_fops.c +++ /dev/null @@ -1,737 +0,0 @@ -/* - * \file drm_fops.c - * File operations for DRM - * - * \author Rickard E. (Rik) Faith - * \author Daryll Strauss - * \author Gareth Hughes - */ - -/* - * Created: Mon Jan 4 08:58:31 1999 by faith@valinux.com - * - * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. - * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. - * 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, sublicense, - * 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 NONINFRINGEMENT. IN NO EVENT SHALL - * VA LINUX SYSTEMS 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. - */ - -#include -#include -#include -#include -#include "drm_legacy.h" -#include "drm_internal.h" -#include "drm_crtc_internal.h" - -/* from BKL pushdown */ -DEFINE_MUTEX(drm_global_mutex); - -/** - * DOC: file operations - * - * Drivers must define the file operations structure that forms the DRM - * userspace API entry point, even though most of those operations are - * implemented in the DRM core. The mandatory functions are drm_open(), - * drm_read(), drm_ioctl() and drm_compat_ioctl() if CONFIG_COMPAT is enabled - * (note that drm_compat_ioctl will be NULL if CONFIG_COMPAT=n). Drivers which - * implement private ioctls that require 32/64 bit compatibility support must - * provide their own .compat_ioctl() handler that processes private ioctls and - * calls drm_compat_ioctl() for core ioctls. - * - * In addition drm_read() and drm_poll() provide support for DRM events. DRM - * events are a generic and extensible means to send asynchronous events to - * userspace through the file descriptor. They are used to send vblank event and - * page flip completions by the KMS API. But drivers can also use it for their - * own needs, e.g. to signal completion of rendering. - * - * The memory mapping implementation will vary depending on how the driver - * manages memory. Legacy drivers will use the deprecated drm_legacy_mmap() - * function, modern drivers should use one of the provided memory-manager - * specific implementations. For GEM-based drivers this is drm_gem_mmap(). - * - * No other file operations are supported by the DRM userspace API. Overall the - * following is an example #file_operations structure:: - * - * static const example_drm_fops = { - * .owner = THIS_MODULE, - * .open = drm_open, - * .release = drm_release, - * .unlocked_ioctl = drm_ioctl, - * .compat_ioctl = drm_compat_ioctl, // NULL if CONFIG_COMPAT=n - * .poll = drm_poll, - * .read = drm_read, - * .llseek = no_llseek, - * .mmap = drm_gem_mmap, - * }; - */ - -static int drm_open_helper(struct file *filp, struct drm_minor *minor); - -static int drm_setup(struct drm_device * dev) -{ - int ret; - - if (dev->driver->firstopen && - drm_core_check_feature(dev, DRIVER_LEGACY)) { - ret = dev->driver->firstopen(dev); - if (ret != 0) - return ret; - } - - ret = drm_legacy_dma_setup(dev); - if (ret < 0) - return ret; - - - DRM_DEBUG("\n"); - return 0; -} - -/** - * drm_open - open method for DRM file - * @inode: device inode - * @filp: file pointer. - * - * This function must be used by drivers as their .open() #file_operations - * method. It looks up the correct DRM device and instantiates all the per-file - * resources for it. - * - * RETURNS: - * - * 0 on success or negative errno value on falure. - */ -int drm_open(struct inode *inode, struct file *filp) -{ - struct drm_device *dev; - struct drm_minor *minor; - int retcode; - int need_setup = 0; - - minor = drm_minor_acquire(iminor(inode)); - if (IS_ERR(minor)) - return PTR_ERR(minor); - - dev = minor->dev; - if (!dev->open_count++) - need_setup = 1; - - /* share address_space across all char-devs of a single device */ - filp->f_mapping = dev->anon_inode->i_mapping; - - retcode = drm_open_helper(filp, minor); - if (retcode) - goto err_undo; - if (need_setup) { - retcode = drm_setup(dev); - if (retcode) - goto err_undo; - } - return 0; - -err_undo: - dev->open_count--; - drm_minor_release(minor); - return retcode; -} -EXPORT_SYMBOL(drm_open); - -/* - * Check whether DRI will run on this CPU. - * - * \return non-zero if the DRI will run on this CPU, or zero otherwise. - */ -static int drm_cpu_valid(void) -{ -#if defined(__sparc__) && !defined(__sparc_v9__) - return 0; /* No cmpxchg before v9 sparc. */ -#endif - return 1; -} - -/* - * Called whenever a process opens /dev/drm. - * - * \param filp file pointer. - * \param minor acquired minor-object. - * \return zero on success or a negative number on failure. - * - * Creates and initializes a drm_file structure for the file private data in \p - * filp and add it into the double linked list in \p dev. - */ -static int drm_open_helper(struct file *filp, struct drm_minor *minor) -{ - struct drm_device *dev = minor->dev; - struct drm_file *priv; - int ret; - - if (filp->f_flags & O_EXCL) - return -EBUSY; /* No exclusive opens */ - if (!drm_cpu_valid()) - return -EINVAL; - if (dev->switch_power_state != DRM_SWITCH_POWER_ON && dev->switch_power_state != DRM_SWITCH_POWER_DYNAMIC_OFF) - return -EINVAL; - - DRM_DEBUG("pid = %d, minor = %d\n", task_pid_nr(current), minor->index); - - priv = kzalloc(sizeof(*priv), GFP_KERNEL); - if (!priv) - return -ENOMEM; - - filp->private_data = priv; - priv->filp = filp; - priv->pid = get_pid(task_pid(current)); - priv->minor = minor; - - /* for compatibility root is always authenticated */ - priv->authenticated = capable(CAP_SYS_ADMIN); - priv->lock_count = 0; - - INIT_LIST_HEAD(&priv->lhead); - INIT_LIST_HEAD(&priv->fbs); - mutex_init(&priv->fbs_lock); - INIT_LIST_HEAD(&priv->blobs); - INIT_LIST_HEAD(&priv->pending_event_list); - INIT_LIST_HEAD(&priv->event_list); - init_waitqueue_head(&priv->event_wait); - priv->event_space = 4096; /* set aside 4k for event buffer */ - - mutex_init(&priv->event_read_lock); - - if (drm_core_check_feature(dev, DRIVER_GEM)) - drm_gem_open(dev, priv); - - if (drm_core_check_feature(dev, DRIVER_PRIME)) - drm_prime_init_file_private(&priv->prime); - - if (dev->driver->open) { - ret = dev->driver->open(dev, priv); - if (ret < 0) - goto out_prime_destroy; - } - - if (drm_is_primary_client(priv)) { - ret = drm_master_open(priv); - if (ret) - goto out_close; - } - - mutex_lock(&dev->filelist_mutex); - list_add(&priv->lhead, &dev->filelist); - mutex_unlock(&dev->filelist_mutex); - -#ifdef __alpha__ - /* - * Default the hose - */ - if (!dev->hose) { - struct pci_dev *pci_dev; - pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL); - if (pci_dev) { - dev->hose = pci_dev->sysdata; - pci_dev_put(pci_dev); - } - if (!dev->hose) { - struct pci_bus *b = list_entry(pci_root_buses.next, - struct pci_bus, node); - if (b) - dev->hose = b->sysdata; - } - } -#endif - - return 0; - -out_close: - if (dev->driver->postclose) - dev->driver->postclose(dev, priv); -out_prime_destroy: - if (drm_core_check_feature(dev, DRIVER_PRIME)) - drm_prime_destroy_file_private(&priv->prime); - if (drm_core_check_feature(dev, DRIVER_GEM)) - drm_gem_release(dev, priv); - put_pid(priv->pid); - kfree(priv); - filp->private_data = NULL; - return ret; -} - -static void drm_events_release(struct drm_file *file_priv) -{ - struct drm_device *dev = file_priv->minor->dev; - struct drm_pending_event *e, *et; - unsigned long flags; - - spin_lock_irqsave(&dev->event_lock, flags); - - /* Unlink pending events */ - list_for_each_entry_safe(e, et, &file_priv->pending_event_list, - pending_link) { - list_del(&e->pending_link); - e->file_priv = NULL; - } - - /* Remove unconsumed events */ - list_for_each_entry_safe(e, et, &file_priv->event_list, link) { - list_del(&e->link); - kfree(e); - } - - spin_unlock_irqrestore(&dev->event_lock, flags); -} - -/* - * drm_legacy_dev_reinit - * - * Reinitializes a legacy/ums drm device in it's lastclose function. - */ -static void drm_legacy_dev_reinit(struct drm_device *dev) -{ - if (dev->irq_enabled) - drm_irq_uninstall(dev); - - mutex_lock(&dev->struct_mutex); - - drm_legacy_agp_clear(dev); - - drm_legacy_sg_cleanup(dev); - drm_legacy_vma_flush(dev); - drm_legacy_dma_takedown(dev); - - mutex_unlock(&dev->struct_mutex); - - dev->sigdata.lock = NULL; - - dev->context_flag = 0; - dev->last_context = 0; - dev->if_version = 0; - - DRM_DEBUG("lastclose completed\n"); -} - -/* - * Take down the DRM device. - * - * \param dev DRM device structure. - * - * Frees every resource in \p dev. - * - * \sa drm_device - */ -void drm_lastclose(struct drm_device * dev) -{ - DRM_DEBUG("\n"); - - if (dev->driver->lastclose) - dev->driver->lastclose(dev); - DRM_DEBUG("driver lastclose completed\n"); - - if (drm_core_check_feature(dev, DRIVER_LEGACY)) - drm_legacy_dev_reinit(dev); -} - -/** - * drm_release - release method for DRM file - * @inode: device inode - * @filp: file pointer. - * - * This function must be used by drivers as their .release() #file_operations - * method. It frees any resources associated with the open file, and if this is - * the last open file for the DRM device also proceeds to call drm_lastclose(). - * - * RETURNS: - * - * Always succeeds and returns 0. - */ -int drm_release(struct inode *inode, struct file *filp) -{ - struct drm_file *file_priv = filp->private_data; - struct drm_minor *minor = file_priv->minor; - struct drm_device *dev = minor->dev; - - mutex_lock(&drm_global_mutex); - - DRM_DEBUG("open_count = %d\n", dev->open_count); - - mutex_lock(&dev->filelist_mutex); - list_del(&file_priv->lhead); - mutex_unlock(&dev->filelist_mutex); - - if (dev->driver->preclose) - dev->driver->preclose(dev, file_priv); - - /* ======================================================== - * Begin inline drm_release - */ - - DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n", - task_pid_nr(current), - (long)old_encode_dev(file_priv->minor->kdev->devt), - dev->open_count); - - if (drm_core_check_feature(dev, DRIVER_LEGACY)) - drm_legacy_lock_release(dev, filp); - - if (drm_core_check_feature(dev, DRIVER_HAVE_DMA)) - drm_legacy_reclaim_buffers(dev, file_priv); - - drm_events_release(file_priv); - - if (drm_core_check_feature(dev, DRIVER_MODESET)) { - drm_fb_release(file_priv); - drm_property_destroy_user_blobs(dev, file_priv); - } - - if (drm_core_check_feature(dev, DRIVER_GEM)) - drm_gem_release(dev, file_priv); - - drm_legacy_ctxbitmap_flush(dev, file_priv); - - if (drm_is_primary_client(file_priv)) - drm_master_release(file_priv); - - if (dev->driver->postclose) - dev->driver->postclose(dev, file_priv); - - if (drm_core_check_feature(dev, DRIVER_PRIME)) - drm_prime_destroy_file_private(&file_priv->prime); - - WARN_ON(!list_empty(&file_priv->event_list)); - - put_pid(file_priv->pid); - kfree(file_priv); - - /* ======================================================== - * End inline drm_release - */ - - if (!--dev->open_count) { - drm_lastclose(dev); - if (drm_device_is_unplugged(dev)) - drm_put_dev(dev); - } - mutex_unlock(&drm_global_mutex); - - drm_minor_release(minor); - - return 0; -} -EXPORT_SYMBOL(drm_release); - -/** - * drm_read - read method for DRM file - * @filp: file pointer - * @buffer: userspace destination pointer for the read - * @count: count in bytes to read - * @offset: offset to read - * - * This function must be used by drivers as their .read() #file_operations - * method iff they use DRM events for asynchronous signalling to userspace. - * Since events are used by the KMS API for vblank and page flip completion this - * means all modern display drivers must use it. - * - * @offset is ignore, DRM events are read like a pipe. Therefore drivers also - * must set the .llseek() #file_operation to no_llseek(). Polling support is - * provided by drm_poll(). - * - * This function will only ever read a full event. Therefore userspace must - * supply a big enough buffer to fit any event to ensure forward progress. Since - * the maximum event space is currently 4K it's recommended to just use that for - * safety. - * - * RETURNS: - * - * Number of bytes read (always aligned to full events, and can be 0) or a - * negative error code on failure. - */ -ssize_t drm_read(struct file *filp, char __user *buffer, - size_t count, loff_t *offset) -{ - struct drm_file *file_priv = filp->private_data; - struct drm_device *dev = file_priv->minor->dev; - ssize_t ret; - - if (!access_ok(VERIFY_WRITE, buffer, count)) - return -EFAULT; - - ret = mutex_lock_interruptible(&file_priv->event_read_lock); - if (ret) - return ret; - - for (;;) { - struct drm_pending_event *e = NULL; - - spin_lock_irq(&dev->event_lock); - if (!list_empty(&file_priv->event_list)) { - e = list_first_entry(&file_priv->event_list, - struct drm_pending_event, link); - file_priv->event_space += e->event->length; - list_del(&e->link); - } - spin_unlock_irq(&dev->event_lock); - - if (e == NULL) { - if (ret) - break; - - if (filp->f_flags & O_NONBLOCK) { - ret = -EAGAIN; - break; - } - - mutex_unlock(&file_priv->event_read_lock); - ret = wait_event_interruptible(file_priv->event_wait, - !list_empty(&file_priv->event_list)); - if (ret >= 0) - ret = mutex_lock_interruptible(&file_priv->event_read_lock); - if (ret) - return ret; - } else { - unsigned length = e->event->length; - - if (length > count - ret) { -put_back_event: - spin_lock_irq(&dev->event_lock); - file_priv->event_space -= length; - list_add(&e->link, &file_priv->event_list); - spin_unlock_irq(&dev->event_lock); - break; - } - - if (copy_to_user(buffer + ret, e->event, length)) { - if (ret == 0) - ret = -EFAULT; - goto put_back_event; - } - - ret += length; - kfree(e); - } - } - mutex_unlock(&file_priv->event_read_lock); - - return ret; -} -EXPORT_SYMBOL(drm_read); - -/** - * drm_poll - poll method for DRM file - * @filp: file pointer - * @wait: poll waiter table - * - * This function must be used by drivers as their .read() #file_operations - * method iff they use DRM events for asynchronous signalling to userspace. - * Since events are used by the KMS API for vblank and page flip completion this - * means all modern display drivers must use it. - * - * See also drm_read(). - * - * RETURNS: - * - * Mask of POLL flags indicating the current status of the file. - */ -unsigned int drm_poll(struct file *filp, struct poll_table_struct *wait) -{ - struct drm_file *file_priv = filp->private_data; - unsigned int mask = 0; - - poll_wait(filp, &file_priv->event_wait, wait); - - if (!list_empty(&file_priv->event_list)) - mask |= POLLIN | POLLRDNORM; - - return mask; -} -EXPORT_SYMBOL(drm_poll); - -/** - * drm_event_reserve_init_locked - init a DRM event and reserve space for it - * @dev: DRM device - * @file_priv: DRM file private data - * @p: tracking structure for the pending event - * @e: actual event data to deliver to userspace - * - * This function prepares the passed in event for eventual delivery. If the event - * doesn't get delivered (because the IOCTL fails later on, before queuing up - * anything) then the even must be cancelled and freed using - * drm_event_cancel_free(). Successfully initialized events should be sent out - * using drm_send_event() or drm_send_event_locked() to signal completion of the - * asynchronous event to userspace. - * - * If callers embedded @p into a larger structure it must be allocated with - * kmalloc and @p must be the first member element. - * - * This is the locked version of drm_event_reserve_init() for callers which - * already hold &drm_device.event_lock. - * - * RETURNS: - * - * 0 on success or a negative error code on failure. - */ -int drm_event_reserve_init_locked(struct drm_device *dev, - struct drm_file *file_priv, - struct drm_pending_event *p, - struct drm_event *e) -{ - if (file_priv->event_space < e->length) - return -ENOMEM; - - file_priv->event_space -= e->length; - - p->event = e; - list_add(&p->pending_link, &file_priv->pending_event_list); - p->file_priv = file_priv; - - return 0; -} -EXPORT_SYMBOL(drm_event_reserve_init_locked); - -/** - * drm_event_reserve_init - init a DRM event and reserve space for it - * @dev: DRM device - * @file_priv: DRM file private data - * @p: tracking structure for the pending event - * @e: actual event data to deliver to userspace - * - * This function prepares the passed in event for eventual delivery. If the event - * doesn't get delivered (because the IOCTL fails later on, before queuing up - * anything) then the even must be cancelled and freed using - * drm_event_cancel_free(). Successfully initialized events should be sent out - * using drm_send_event() or drm_send_event_locked() to signal completion of the - * asynchronous event to userspace. - * - * If callers embedded @p into a larger structure it must be allocated with - * kmalloc and @p must be the first member element. - * - * Callers which already hold &drm_device.event_lock should use - * drm_event_reserve_init_locked() instead. - * - * RETURNS: - * - * 0 on success or a negative error code on failure. - */ -int drm_event_reserve_init(struct drm_device *dev, - struct drm_file *file_priv, - struct drm_pending_event *p, - struct drm_event *e) -{ - unsigned long flags; - int ret; - - spin_lock_irqsave(&dev->event_lock, flags); - ret = drm_event_reserve_init_locked(dev, file_priv, p, e); - spin_unlock_irqrestore(&dev->event_lock, flags); - - return ret; -} -EXPORT_SYMBOL(drm_event_reserve_init); - -/** - * drm_event_cancel_free - free a DRM event and release it's space - * @dev: DRM device - * @p: tracking structure for the pending event - * - * This function frees the event @p initialized with drm_event_reserve_init() - * and releases any allocated space. - */ -void drm_event_cancel_free(struct drm_device *dev, - struct drm_pending_event *p) -{ - unsigned long flags; - spin_lock_irqsave(&dev->event_lock, flags); - if (p->file_priv) { - p->file_priv->event_space += p->event->length; - list_del(&p->pending_link); - } - spin_unlock_irqrestore(&dev->event_lock, flags); - - if (p->fence) - dma_fence_put(p->fence); - - kfree(p); -} -EXPORT_SYMBOL(drm_event_cancel_free); - -/** - * drm_send_event_locked - send DRM event to file descriptor - * @dev: DRM device - * @e: DRM event to deliver - * - * This function sends the event @e, initialized with drm_event_reserve_init(), - * to its associated userspace DRM file. Callers must already hold - * &drm_device.event_lock, see drm_send_event() for the unlocked version. - * - * Note that the core will take care of unlinking and disarming events when the - * corresponding DRM file is closed. Drivers need not worry about whether the - * DRM file for this event still exists and can call this function upon - * completion of the asynchronous work unconditionally. - */ -void drm_send_event_locked(struct drm_device *dev, struct drm_pending_event *e) -{ - assert_spin_locked(&dev->event_lock); - - if (e->completion) { - complete_all(e->completion); - e->completion_release(e->completion); - e->completion = NULL; - } - - if (e->fence) { - dma_fence_signal(e->fence); - dma_fence_put(e->fence); - } - - if (!e->file_priv) { - kfree(e); - return; - } - - list_del(&e->pending_link); - list_add_tail(&e->link, - &e->file_priv->event_list); - wake_up_interruptible(&e->file_priv->event_wait); -} -EXPORT_SYMBOL(drm_send_event_locked); - -/** - * drm_send_event - send DRM event to file descriptor - * @dev: DRM device - * @e: DRM event to deliver - * - * This function sends the event @e, initialized with drm_event_reserve_init(), - * to its associated userspace DRM file. This function acquires - * &drm_device.event_lock, see drm_send_event_locked() for callers which already - * hold this lock. - * - * Note that the core will take care of unlinking and disarming events when the - * corresponding DRM file is closed. Drivers need not worry about whether the - * DRM file for this event still exists and can call this function upon - * completion of the asynchronous work unconditionally. - */ -void drm_send_event(struct drm_device *dev, struct drm_pending_event *e) -{ - unsigned long irqflags; - - spin_lock_irqsave(&dev->event_lock, irqflags); - drm_send_event_locked(dev, e); - spin_unlock_irqrestore(&dev->event_lock, irqflags); -} -EXPORT_SYMBOL(drm_send_event); diff --git a/drivers/gpu/drm/drm_internal.h b/drivers/gpu/drm/drm_internal.h index f37388cb2fde..92ff4b9393b1 100644 --- a/drivers/gpu/drm/drm_internal.h +++ b/drivers/gpu/drm/drm_internal.h @@ -24,7 +24,7 @@ #define DRM_IF_MAJOR 1 #define DRM_IF_MINOR 4 -/* drm_fops.c */ +/* drm_file.c */ extern struct mutex drm_global_mutex; void drm_lastclose(struct drm_device *dev); diff --git a/include/drm/drmP.h b/include/drm/drmP.h index 1ad699de8769..826101785876 100644 --- a/include/drm/drmP.h +++ b/include/drm/drmP.h @@ -689,7 +689,7 @@ extern long drm_compat_ioctl(struct file *filp, #endif extern bool drm_ioctl_flags(unsigned int nr, unsigned int *flags); -/* File Operations (drm_fops.c) */ +/* File Operations (drm_file.c) */ int drm_open(struct inode *inode, struct file *filp); ssize_t drm_read(struct file *filp, char __user *buffer, size_t count, loff_t *offset);