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204 lines
5.9 KiB
204 lines
5.9 KiB
/* |
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* drm_irq.c IRQ and vblank support |
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* |
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* \author Rickard E. (Rik) Faith <[email protected]> |
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* \author Gareth Hughes <[email protected]> |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a |
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* copy of this software and associated documentation files (the "Software"), |
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* to deal in the Software without restriction, including without limitation |
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* the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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* and/or sell copies of the Software, and to permit persons to whom the |
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* Software is furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice (including the next |
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* paragraph) shall be included in all copies or substantial portions of the |
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* Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR |
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
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* OTHER DEALINGS IN THE SOFTWARE. |
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*/ |
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/* |
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* Created: Fri Mar 19 14:30:16 1999 by [email protected] |
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* |
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* Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. |
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. |
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* All Rights Reserved. |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a |
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* copy of this software and associated documentation files (the "Software"), |
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* to deal in the Software without restriction, including without limitation |
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* the rights to use, copy, modify, merge, publish, distribute, sublicense, |
|
* and/or sell copies of the Software, and to permit persons to whom the |
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* Software is furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice (including the next |
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* paragraph) shall be included in all copies or substantial portions of the |
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* Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR |
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
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* OTHER DEALINGS IN THE SOFTWARE. |
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*/ |
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#include <linux/export.h> |
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#include <linux/interrupt.h> /* For task queue support */ |
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#include <linux/pci.h> |
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#include <linux/vgaarb.h> |
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#include <drm/drm.h> |
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#include <drm/drm_device.h> |
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#include <drm/drm_drv.h> |
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#include <drm/drm_legacy.h> |
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#include <drm/drm_print.h> |
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#include <drm/drm_vblank.h> |
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#include "drm_internal.h" |
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static int drm_legacy_irq_install(struct drm_device *dev, int irq) |
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{ |
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int ret; |
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unsigned long sh_flags = 0; |
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if (irq == 0) |
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return -EINVAL; |
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if (dev->irq_enabled) |
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return -EBUSY; |
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dev->irq_enabled = true; |
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DRM_DEBUG("irq=%d\n", irq); |
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/* Before installing handler */ |
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if (dev->driver->irq_preinstall) |
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dev->driver->irq_preinstall(dev); |
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/* PCI devices require shared interrupts. */ |
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if (dev_is_pci(dev->dev)) |
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sh_flags = IRQF_SHARED; |
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ret = request_irq(irq, dev->driver->irq_handler, |
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sh_flags, dev->driver->name, dev); |
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if (ret < 0) { |
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dev->irq_enabled = false; |
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return ret; |
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} |
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/* After installing handler */ |
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if (dev->driver->irq_postinstall) |
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ret = dev->driver->irq_postinstall(dev); |
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if (ret < 0) { |
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dev->irq_enabled = false; |
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if (drm_core_check_feature(dev, DRIVER_LEGACY)) |
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vga_client_unregister(to_pci_dev(dev->dev)); |
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free_irq(irq, dev); |
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} else { |
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dev->irq = irq; |
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} |
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return ret; |
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} |
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int drm_legacy_irq_uninstall(struct drm_device *dev) |
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{ |
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unsigned long irqflags; |
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bool irq_enabled; |
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int i; |
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irq_enabled = dev->irq_enabled; |
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dev->irq_enabled = false; |
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/* |
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* Wake up any waiters so they don't hang. This is just to paper over |
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* issues for UMS drivers which aren't in full control of their |
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* vblank/irq handling. KMS drivers must ensure that vblanks are all |
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* disabled when uninstalling the irq handler. |
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*/ |
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if (drm_dev_has_vblank(dev)) { |
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spin_lock_irqsave(&dev->vbl_lock, irqflags); |
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for (i = 0; i < dev->num_crtcs; i++) { |
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struct drm_vblank_crtc *vblank = &dev->vblank[i]; |
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if (!vblank->enabled) |
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continue; |
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WARN_ON(drm_core_check_feature(dev, DRIVER_MODESET)); |
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drm_vblank_disable_and_save(dev, i); |
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wake_up(&vblank->queue); |
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} |
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spin_unlock_irqrestore(&dev->vbl_lock, irqflags); |
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} |
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if (!irq_enabled) |
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return -EINVAL; |
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DRM_DEBUG("irq=%d\n", dev->irq); |
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if (drm_core_check_feature(dev, DRIVER_LEGACY)) |
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vga_client_unregister(to_pci_dev(dev->dev)); |
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if (dev->driver->irq_uninstall) |
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dev->driver->irq_uninstall(dev); |
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free_irq(dev->irq, dev); |
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return 0; |
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} |
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EXPORT_SYMBOL(drm_legacy_irq_uninstall); |
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int drm_legacy_irq_control(struct drm_device *dev, void *data, |
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struct drm_file *file_priv) |
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{ |
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struct drm_control *ctl = data; |
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int ret = 0, irq; |
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struct pci_dev *pdev; |
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/* if we haven't irq we fallback for compatibility reasons - |
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* this used to be a separate function in drm_dma.h |
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*/ |
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if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ)) |
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return 0; |
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if (!drm_core_check_feature(dev, DRIVER_LEGACY)) |
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return 0; |
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/* UMS was only ever supported on pci devices. */ |
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if (WARN_ON(!dev_is_pci(dev->dev))) |
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return -EINVAL; |
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switch (ctl->func) { |
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case DRM_INST_HANDLER: |
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pdev = to_pci_dev(dev->dev); |
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irq = pdev->irq; |
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if (dev->if_version < DRM_IF_VERSION(1, 2) && |
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ctl->irq != irq) |
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return -EINVAL; |
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mutex_lock(&dev->struct_mutex); |
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ret = drm_legacy_irq_install(dev, irq); |
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mutex_unlock(&dev->struct_mutex); |
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return ret; |
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case DRM_UNINST_HANDLER: |
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mutex_lock(&dev->struct_mutex); |
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ret = drm_legacy_irq_uninstall(dev); |
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mutex_unlock(&dev->struct_mutex); |
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return ret; |
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default: |
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return -EINVAL; |
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} |
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}
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