diff options
Diffstat (limited to 'drivers/gpu/drm/drm_irq.c')
| -rw-r--r-- | drivers/gpu/drm/drm_irq.c | 464 |
1 files changed, 387 insertions, 77 deletions
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c index 53f0e5a..4091b9e 100644 --- a/drivers/gpu/drm/drm_irq.c +++ b/drivers/gpu/drm/drm_irq.c @@ -63,7 +63,7 @@ int drm_irq_by_busid(struct drm_device *dev, void *data, p->devnum != PCI_SLOT(dev->pdev->devfn) || p->funcnum != PCI_FUNC(dev->pdev->devfn)) return -EINVAL; - p->irq = dev->irq; + p->irq = dev->pdev->irq; DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum, p->irq); @@ -71,25 +71,137 @@ int drm_irq_by_busid(struct drm_device *dev, void *data, return 0; } +static void vblank_disable_fn(unsigned long arg) +{ + struct drm_device *dev = (struct drm_device *)arg; + unsigned long irqflags; + int i; + + if (!dev->vblank_disable_allowed) + return; + + for (i = 0; i < dev->num_crtcs; i++) { + spin_lock_irqsave(&dev->vbl_lock, irqflags); + if (atomic_read(&dev->vblank_refcount[i]) == 0 && + dev->vblank_enabled[i]) { + DRM_DEBUG("disabling vblank on crtc %d\n", i); + dev->last_vblank[i] = + dev->driver->get_vblank_counter(dev, i); + dev->driver->disable_vblank(dev, i); + dev->vblank_enabled[i] = 0; + } + spin_unlock_irqrestore(&dev->vbl_lock, irqflags); + } +} + +static void drm_vblank_cleanup(struct drm_device *dev) +{ + /* Bail if the driver didn't call drm_vblank_init() */ + if (dev->num_crtcs == 0) + return; + + del_timer(&dev->vblank_disable_timer); + + vblank_disable_fn((unsigned long)dev); + + drm_free(dev->vbl_queue, sizeof(*dev->vbl_queue) * dev->num_crtcs, + DRM_MEM_DRIVER); + drm_free(dev->vbl_sigs, sizeof(*dev->vbl_sigs) * dev->num_crtcs, + DRM_MEM_DRIVER); + drm_free(dev->_vblank_count, sizeof(*dev->_vblank_count) * + dev->num_crtcs, DRM_MEM_DRIVER); + drm_free(dev->vblank_refcount, sizeof(*dev->vblank_refcount) * + dev->num_crtcs, DRM_MEM_DRIVER); + drm_free(dev->vblank_enabled, sizeof(*dev->vblank_enabled) * + dev->num_crtcs, DRM_MEM_DRIVER); + drm_free(dev->last_vblank, sizeof(*dev->last_vblank) * dev->num_crtcs, + DRM_MEM_DRIVER); + drm_free(dev->vblank_inmodeset, sizeof(*dev->vblank_inmodeset) * + dev->num_crtcs, DRM_MEM_DRIVER); + + dev->num_crtcs = 0; +} + +int drm_vblank_init(struct drm_device *dev, int num_crtcs) +{ + int i, ret = -ENOMEM; + + setup_timer(&dev->vblank_disable_timer, vblank_disable_fn, + (unsigned long)dev); + spin_lock_init(&dev->vbl_lock); + atomic_set(&dev->vbl_signal_pending, 0); + dev->num_crtcs = num_crtcs; + + dev->vbl_queue = drm_alloc(sizeof(wait_queue_head_t) * num_crtcs, + DRM_MEM_DRIVER); + if (!dev->vbl_queue) + goto err; + + dev->vbl_sigs = drm_alloc(sizeof(struct list_head) * num_crtcs, + DRM_MEM_DRIVER); + if (!dev->vbl_sigs) + goto err; + + dev->_vblank_count = drm_alloc(sizeof(atomic_t) * num_crtcs, + DRM_MEM_DRIVER); + if (!dev->_vblank_count) + goto err; + + dev->vblank_refcount = drm_alloc(sizeof(atomic_t) * num_crtcs, + DRM_MEM_DRIVER); + if (!dev->vblank_refcount) + goto err; + + dev->vblank_enabled = drm_calloc(num_crtcs, sizeof(int), + DRM_MEM_DRIVER); + if (!dev->vblank_enabled) + goto err; + + dev->last_vblank = drm_calloc(num_crtcs, sizeof(u32), DRM_MEM_DRIVER); + if (!dev->last_vblank) + goto err; + + dev->vblank_inmodeset = drm_calloc(num_crtcs, sizeof(int), + DRM_MEM_DRIVER); + if (!dev->vblank_inmodeset) + goto err; + + /* Zero per-crtc vblank stuff */ + for (i = 0; i < num_crtcs; i++) { + init_waitqueue_head(&dev->vbl_queue[i]); + INIT_LIST_HEAD(&dev->vbl_sigs[i]); + atomic_set(&dev->_vblank_count[i], 0); + atomic_set(&dev->vblank_refcount[i], 0); + } + + dev->vblank_disable_allowed = 0; + + return 0; + +err: + drm_vblank_cleanup(dev); + return ret; +} +EXPORT_SYMBOL(drm_vblank_init); + /** * Install IRQ handler. * * \param dev DRM device. - * \param irq IRQ number. * - * Initializes the IRQ related data, and setups drm_device::vbl_queue. Installs the handler, calling the driver + * Initializes the IRQ related data. Installs the handler, calling the driver * \c drm_driver_irq_preinstall() and \c drm_driver_irq_postinstall() functions * before and after the installation. */ -static int drm_irq_install(struct drm_device * dev) +int drm_irq_install(struct drm_device *dev) { - int ret; + int ret = 0; unsigned long sh_flags = 0; if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) return -EINVAL; - if (dev->irq == 0) + if (dev->pdev->irq == 0) return -EINVAL; mutex_lock(&dev->struct_mutex); @@ -107,18 +219,7 @@ static int drm_irq_install(struct drm_device * dev) dev->irq_enabled = 1; mutex_unlock(&dev->struct_mutex); - DRM_DEBUG("irq=%d\n", dev->irq); - - if (drm_core_check_feature(dev, DRIVER_IRQ_VBL)) { - init_waitqueue_head(&dev->vbl_queue); - - spin_lock_init(&dev->vbl_lock); - - INIT_LIST_HEAD(&dev->vbl_sigs); - INIT_LIST_HEAD(&dev->vbl_sigs2); - - dev->vbl_pending = 0; - } + DRM_DEBUG("irq=%d\n", dev->pdev->irq); /* Before installing handler */ dev->driver->irq_preinstall(dev); @@ -127,8 +228,9 @@ static int drm_irq_install(struct drm_device * dev) if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED)) sh_flags = IRQF_SHARED; - ret = request_irq(dev->irq, dev->driver->irq_handler, + ret = request_irq(drm_dev_to_irq(dev), dev->driver->irq_handler, sh_flags, dev->devname, dev); + if (ret < 0) { mutex_lock(&dev->struct_mutex); dev->irq_enabled = 0; @@ -137,10 +239,16 @@ static int drm_irq_install(struct drm_device * dev) } /* After installing handler */ - dev->driver->irq_postinstall(dev); + ret = dev->driver->irq_postinstall(dev); + if (ret < 0) { + mutex_lock(&dev->struct_mutex); + dev->irq_enabled = 0; + mutex_unlock(&dev->struct_mutex); + } - return 0; + return ret; } +EXPORT_SYMBOL(drm_irq_install); /** * Uninstall the IRQ handler. @@ -164,17 +272,18 @@ int drm_irq_uninstall(struct drm_device * dev) if (!irq_enabled) return -EINVAL; - DRM_DEBUG("irq=%d\n", dev->irq); + DRM_DEBUG("irq=%d\n", dev->pdev->irq); dev->driver->irq_uninstall(dev); - free_irq(dev->irq, dev); + free_irq(dev->pdev->irq, dev); + + drm_vblank_cleanup(dev); dev->locked_tasklet_func = NULL; return 0; } - EXPORT_SYMBOL(drm_irq_uninstall); /** @@ -201,7 +310,7 @@ int drm_control(struct drm_device *dev, void *data, if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) return 0; if (dev->if_version < DRM_IF_VERSION(1, 2) && - ctl->irq != dev->irq) + ctl->irq != dev->pdev->irq) return -EINVAL; return drm_irq_install(dev); case DRM_UNINST_HANDLER: @@ -214,6 +323,174 @@ int drm_control(struct drm_device *dev, void *data, } /** + * drm_vblank_count - retrieve "cooked" vblank counter value + * @dev: DRM device + * @crtc: which counter to retrieve + * + * Fetches the "cooked" vblank count value that represents the number of + * vblank events since the system was booted, including lost events due to + * modesetting activity. + */ +u32 drm_vblank_count(struct drm_device *dev, int crtc) +{ + return atomic_read(&dev->_vblank_count[crtc]); +} +EXPORT_SYMBOL(drm_vblank_count); + +/** + * drm_update_vblank_count - update the master vblank counter + * @dev: DRM device + * @crtc: counter to update + * + * Call back into the driver to update the appropriate vblank counter + * (specified by @crtc). Deal with wraparound, if it occurred, and + * update the last read value so we can deal with wraparound on the next + * call if necessary. + * + * Only necessary when going from off->on, to account for frames we + * didn't get an interrupt for. + * + * Note: caller must hold dev->vbl_lock since this reads & writes + * device vblank fields. + */ +static void drm_update_vblank_count(struct drm_device *dev, int crtc) +{ + u32 cur_vblank, diff; + + /* + * Interrupts were disabled prior to this call, so deal with counter + * wrap if needed. + * NOTE! It's possible we lost a full dev->max_vblank_count events + * here if the register is small or we had vblank interrupts off for + * a long time. + */ + cur_vblank = dev->driver->get_vblank_counter(dev, crtc); + diff = cur_vblank - dev->last_vblank[crtc]; + if (cur_vblank < dev->last_vblank[crtc]) { + diff += dev->max_vblank_count; + + DRM_DEBUG("last_vblank[%d]=0x%x, cur_vblank=0x%x => diff=0x%x\n", + crtc, dev->last_vblank[crtc], cur_vblank, diff); + } + + DRM_DEBUG("enabling vblank interrupts on crtc %d, missed %d\n", + crtc, diff); + + atomic_add(diff, &dev->_vblank_count[crtc]); +} + +/** + * drm_vblank_get - get a reference count on vblank events + * @dev: DRM device + * @crtc: which CRTC to own + * + * Acquire a reference count on vblank events to avoid having them disabled + * while in use. + * + * RETURNS + * Zero on success, nonzero on failure. + */ +int drm_vblank_get(struct drm_device *dev, int crtc) +{ + unsigned long irqflags; + int ret = 0; + + spin_lock_irqsave(&dev->vbl_lock, irqflags); + /* Going from 0->1 means we have to enable interrupts again */ + if (atomic_add_return(1, &dev->vblank_refcount[crtc]) == 1 && + !dev->vblank_enabled[crtc]) { + ret = dev->driver->enable_vblank(dev, crtc); + DRM_DEBUG("enabling vblank on crtc %d, ret: %d\n", crtc, ret); + if (ret) + atomic_dec(&dev->vblank_refcount[crtc]); + else { + dev->vblank_enabled[crtc] = 1; + drm_update_vblank_count(dev, crtc); + } + } + spin_unlock_irqrestore(&dev->vbl_lock, irqflags); + + return ret; +} +EXPORT_SYMBOL(drm_vblank_get); + +/** + * drm_vblank_put - give up ownership of vblank events + * @dev: DRM device + * @crtc: which counter to give up + * + * Release ownership of a given vblank counter, turning off interrupts + * if possible. + */ +void drm_vblank_put(struct drm_device *dev, int crtc) +{ + /* Last user schedules interrupt disable */ + if (atomic_dec_and_test(&dev->vblank_refcount[crtc])) + mod_timer(&dev->vblank_disable_timer, jiffies + 5*DRM_HZ); +} +EXPORT_SYMBOL(drm_vblank_put); + +/** + * drm_modeset_ctl - handle vblank event counter changes across mode switch + * @DRM_IOCTL_ARGS: standard ioctl arguments + * + * Applications should call the %_DRM_PRE_MODESET and %_DRM_POST_MODESET + * ioctls around modesetting so that any lost vblank events are accounted for. + * + * Generally the counter will reset across mode sets. If interrupts are + * enabled around this call, we don't have to do anything since the counter + * will have already been incremented. + */ +int drm_modeset_ctl(struct drm_device *dev, void *data, + struct drm_file *file_priv) +{ + struct drm_modeset_ctl *modeset = data; + unsigned long irqflags; + int crtc, ret = 0; + + /* If drm_vblank_init() hasn't been called yet, just no-op */ + if (!dev->num_crtcs) + goto out; + + crtc = modeset->crtc; + if (crtc >= dev->num_crtcs) { + ret = -EINVAL; + goto out; + } + + /* + * To avoid all the problems that might happen if interrupts + * were enabled/disabled around or between these calls, we just + * have the kernel take a reference on the CRTC (just once though + * to avoid corrupting the count if multiple, mismatch calls occur), + * so that interrupts remain enabled in the interim. + */ + switch (modeset->cmd) { + case _DRM_PRE_MODESET: + if (!dev->vblank_inmodeset[crtc]) { + dev->vblank_inmodeset[crtc] = 1; + drm_vblank_get(dev, crtc); + } + break; + case _DRM_POST_MODESET: + if (dev->vblank_inmodeset[crtc]) { + spin_lock_irqsave(&dev->vbl_lock, irqflags); + dev->vblank_disable_allowed = 1; + dev->vblank_inmodeset[crtc] = 0; + spin_unlock_irqrestore(&dev->vbl_lock, irqflags); + drm_vblank_put(dev, crtc); + } + break; + default: + ret = -EINVAL; + break; + } + +out: + return ret; +} + +/** * Wait for VBLANK. * * \param inode device inode. @@ -232,14 +509,14 @@ int drm_control(struct drm_device *dev, void *data, * * If a signal is not requested, then calls vblank_wait(). */ -int drm_wait_vblank(struct drm_device *dev, void *data, struct drm_file *file_priv) +int drm_wait_vblank(struct drm_device *dev, void *data, + struct drm_file *file_priv) { union drm_wait_vblank *vblwait = data; - struct timeval now; int ret = 0; - unsigned int flags, seq; + unsigned int flags, seq, crtc; - if ((!dev->irq) || (!dev->irq_enabled)) + if ((!dev->pdev->irq) || (!dev->irq_enabled)) return -EINVAL; if (vblwait->request.type & @@ -251,13 +528,17 @@ int drm_wait_vblank(struct drm_device *dev, void *data, struct drm_file *file_pr } flags = vblwait->request.type & _DRM_VBLANK_FLAGS_MASK; + crtc = flags & _DRM_VBLANK_SECONDARY ? 1 : 0; - if (!drm_core_check_feature(dev, (flags & _DRM_VBLANK_SECONDARY) ? - DRIVER_IRQ_VBL2 : DRIVER_IRQ_VBL)) + if (crtc >= dev->num_crtcs) return -EINVAL; - seq = atomic_read((flags & _DRM_VBLANK_SECONDARY) ? &dev->vbl_received2 - : &dev->vbl_received); + ret = drm_vblank_get(dev, crtc); + if (ret) { + DRM_ERROR("failed to acquire vblank counter, %d\n", ret); + return ret; + } + seq = drm_vblank_count(dev, crtc); switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) { case _DRM_VBLANK_RELATIVE: @@ -266,7 +547,8 @@ int drm_wait_vblank(struct drm_device *dev, void *data, struct drm_file *file_pr case _DRM_VBLANK_ABSOLUTE: break; default: - return -EINVAL; + ret = -EINVAL; + goto done; } if ((flags & _DRM_VBLANK_NEXTONMISS) && @@ -276,8 +558,7 @@ int drm_wait_vblank(struct drm_device *dev, void *data, struct drm_file *file_pr if (flags & _DRM_VBLANK_SIGNAL) { unsigned long irqflags; - struct list_head *vbl_sigs = (flags & _DRM_VBLANK_SECONDARY) - ? &dev->vbl_sigs2 : &dev->vbl_sigs; + struct list_head *vbl_sigs = &dev->vbl_sigs[crtc]; struct drm_vbl_sig *vbl_sig; spin_lock_irqsave(&dev->vbl_lock, irqflags); @@ -298,22 +579,29 @@ int drm_wait_vblank(struct drm_device *dev, void *data, struct drm_file *file_pr } } - if (dev->vbl_pending >= 100) { + if (atomic_read(&dev->vbl_signal_pending) >= 100) { spin_unlock_irqrestore(&dev->vbl_lock, irqflags); - return -EBUSY; + ret = -EBUSY; + goto done; } - dev->vbl_pending++; - spin_unlock_irqrestore(&dev->vbl_lock, irqflags); - if (! - (vbl_sig = - drm_alloc(sizeof(struct drm_vbl_sig), DRM_MEM_DRIVER))) { - return -ENOMEM; + vbl_sig = drm_calloc(1, sizeof(struct drm_vbl_sig), + DRM_MEM_DRIVER); + if (!vbl_sig) { + ret = -ENOMEM; + goto done; + } + + ret = drm_vblank_get(dev, crtc); + if (ret) { + drm_free(vbl_sig, sizeof(struct drm_vbl_sig), + DRM_MEM_DRIVER); + return ret; } - memset((void *)vbl_sig, 0, sizeof(*vbl_sig)); + atomic_inc(&dev->vbl_signal_pending); vbl_sig->sequence = vblwait->request.sequence; vbl_sig->info.si_signo = vblwait->request.signal; @@ -327,20 +615,29 @@ int drm_wait_vblank(struct drm_device *dev, void *data, struct drm_file *file_pr vblwait->reply.sequence = seq; } else { - if (flags & _DRM_VBLANK_SECONDARY) { - if (dev->driver->vblank_wait2) - ret = dev->driver->vblank_wait2(dev, &vblwait->request.sequence); - } else if (dev->driver->vblank_wait) - ret = - dev->driver->vblank_wait(dev, - &vblwait->request.sequence); - - do_gettimeofday(&now); - vblwait->reply.tval_sec = now.tv_sec; - vblwait->reply.tval_usec = now.tv_usec; + DRM_DEBUG("waiting on vblank count %d, crtc %d\n", + vblwait->request.sequence, crtc); + DRM_WAIT_ON(ret, dev->vbl_queue[crtc], 3 * DRM_HZ, + ((drm_vblank_count(dev, crtc) + - vblwait->request.sequence) <= (1 << 23))); + + if (ret != -EINTR) { + struct timeval now; + + do_gettimeofday(&now); + + vblwait->reply.tval_sec = now.tv_sec; + vblwait->reply.tval_usec = now.tv_usec; + vblwait->reply.sequence = drm_vblank_count(dev, crtc); + DRM_DEBUG("returning %d to client\n", + vblwait->reply.sequence); + } else { + DRM_DEBUG("vblank wait interrupted by signal\n"); + } } - done: +done: + drm_vblank_put(dev, crtc); return ret; } @@ -348,44 +645,57 @@ int drm_wait_vblank(struct drm_device *dev, void *data, struct drm_file *file_pr * Send the VBLANK signals. * * \param dev DRM device. + * \param crtc CRTC where the vblank event occurred * * Sends a signal for each task in drm_device::vbl_sigs and empties the list. * * If a signal is not requested, then calls vblank_wait(). */ -void drm_vbl_send_signals(struct drm_device * dev) +static void drm_vbl_send_signals(struct drm_device *dev, int crtc) { + struct drm_vbl_sig *vbl_sig, *tmp; + struct list_head *vbl_sigs; + unsigned int vbl_seq; unsigned long flags; - int i; spin_lock_irqsave(&dev->vbl_lock, flags); - for (i = 0; i < 2; i++) { - struct drm_vbl_sig *vbl_sig, *tmp; - struct list_head *vbl_sigs = i ? &dev->vbl_sigs2 : &dev->vbl_sigs; - unsigned int vbl_seq = atomic_read(i ? &dev->vbl_received2 : - &dev->vbl_received); + vbl_sigs = &dev->vbl_sigs[crtc]; + vbl_seq = drm_vblank_count(dev, crtc); - list_for_each_entry_safe(vbl_sig, tmp, vbl_sigs, head) { - if ((vbl_seq - vbl_sig->sequence) <= (1 << 23)) { - vbl_sig->info.si_code = vbl_seq; - send_sig_info(vbl_sig->info.si_signo, - &vbl_sig->info, vbl_sig->task); + list_for_each_entry_safe(vbl_sig, tmp, vbl_sigs, head) { + if ((vbl_seq - vbl_sig->sequence) <= (1 << 23)) { + vbl_sig->info.si_code = vbl_seq; + send_sig_info(vbl_sig->info.si_signo, + &vbl_sig->info, vbl_sig->task); - list_del(&vbl_sig->head); - - drm_free(vbl_sig, sizeof(*vbl_sig), - DRM_MEM_DRIVER); + list_del(&vbl_sig->head); - dev->vbl_pending--; - } - } + drm_free(vbl_sig, sizeof(*vbl_sig), + DRM_MEM_DRIVER); + atomic_dec(&dev->vbl_signal_pending); + drm_vblank_put(dev, crtc); + } } spin_unlock_irqrestore(&dev->vbl_lock, flags); } -EXPORT_SYMBOL(drm_vbl_send_signals); +/** + * drm_handle_vblank - handle a vblank event + * @dev: DRM device + * @crtc: where this event occurred + * + * Drivers should call this routine in their vblank interrupt handlers to + * update the vblank counter and send any signals that may be pending. + */ +void drm_handle_vblank(struct drm_device *dev, int crtc) +{ + atomic_inc(&dev->_vblank_count[crtc]); + DRM_WAKEUP(&dev->vbl_queue[crtc]); + drm_vbl_send_signals(dev, crtc); +} +EXPORT_SYMBOL(drm_handle_vblank); /** * Tasklet wrapper function. |
