69fdf4206a
If the ioctl is not supported on a particular piece of HW/driver combination, report ENOTSUP (aka EOPNOTSUPP) so that it can be easily distinguished from both the lack of the ioctl and from a regular invalid parameter. v2: Across all the kms ioctls we had a mixture of reporting EINVAL, ENODEV and a few ENOTSUPP (most where EINVAL) for a failed drm_core_check_feature(). Update everybody to report ENOTSUPP. v3: ENOTSUPP is an internal errno! It's value (524) does not correspond to a POSIX errno, the one we want is ENOTSUP. However, uapi/asm-generic/errno.h doesn't include ENOTSUP but man errno says "ENOTSUP and EOPNOTSUPP have the same value on Linux, but according to POSIX.1 these error values should be distinct." so use EOPNOTSUPP as its equivalent. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Daniel Vetter <daniel@ffwll.ch> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> #v2 Link: https://patchwork.freedesktop.org/patch/msgid/20180913192050.24812-1-chris@chris-wilson.co.uk
262 lines
8 KiB
C
262 lines
8 KiB
C
/*
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* drm_irq.c IRQ and vblank support
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*
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* \author Rickard E. (Rik) Faith <faith@valinux.com>
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* \author Gareth Hughes <gareth@valinux.com>
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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 faith@valinux.com
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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,
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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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#include <drm/drm_irq.h>
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#include <drm/drmP.h>
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#include <linux/interrupt.h> /* For task queue support */
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#include <linux/vgaarb.h>
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#include <linux/export.h>
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#include "drm_internal.h"
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/**
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* DOC: irq helpers
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*
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* The DRM core provides very simple support helpers to enable IRQ handling on a
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* device through the drm_irq_install() and drm_irq_uninstall() functions. This
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* only supports devices with a single interrupt on the main device stored in
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* &drm_device.dev and set as the device paramter in drm_dev_alloc().
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*
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* These IRQ helpers are strictly optional. Drivers which roll their own only
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* need to set &drm_device.irq_enabled to signal the DRM core that vblank
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* interrupts are working. Since these helpers don't automatically clean up the
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* requested interrupt like e.g. devm_request_irq() they're not really
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* recommended.
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*/
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/**
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* drm_irq_install - install IRQ handler
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* @dev: DRM device
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* @irq: IRQ number to install the handler for
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*
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* Initializes the IRQ related data. Installs the handler, calling the driver
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* &drm_driver.irq_preinstall and &drm_driver.irq_postinstall functions before
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* and after the installation.
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*
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* This is the simplified helper interface provided for drivers with no special
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* needs. Drivers which need to install interrupt handlers for multiple
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* interrupts must instead set &drm_device.irq_enabled to signal the DRM core
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* that vblank interrupts are available.
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*
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* @irq must match the interrupt number that would be passed to request_irq(),
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* if called directly instead of using this helper function.
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*
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* &drm_driver.irq_handler is called to handle the registered interrupt.
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*
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* Returns:
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* Zero on success or a negative error code on failure.
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*/
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int drm_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 (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
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return -EOPNOTSUPP;
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if (irq == 0)
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return -EINVAL;
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/* Driver must have been initialized */
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if (!dev->dev_private)
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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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/* Install handler */
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if (drm_core_check_feature(dev, DRIVER_IRQ_SHARED))
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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_register(dev->pdev, NULL, NULL, NULL);
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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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EXPORT_SYMBOL(drm_irq_install);
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/**
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* drm_irq_uninstall - uninstall the IRQ handler
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* @dev: DRM device
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*
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* Calls the driver's &drm_driver.irq_uninstall function and unregisters the IRQ
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* handler. This should only be called by drivers which used drm_irq_install()
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* to set up their interrupt handler. Other drivers must only reset
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* &drm_device.irq_enabled to false.
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*
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* Note that for kernel modesetting drivers it is a bug if this function fails.
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* The sanity checks are only to catch buggy user modesetting drivers which call
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* the same function through an ioctl.
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*
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* Returns:
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* Zero on success or a negative error code on failure.
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*/
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int drm_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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if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ))
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return -EOPNOTSUPP;
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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 (dev->num_crtcs) {
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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_register(dev->pdev, NULL, NULL, NULL);
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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_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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/* 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->pdev))
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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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irq = dev->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_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_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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