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![Arnd Bergmann](/assets/img/avatar_default.png)
The drm vblank handling uses 'timeval' to store timestamps in either
monotonic or wall-clock time base. In either case, it reads the current
time as a ktime_t in get_drm_timestamp() and converts it from there.
This is a bit suspicious, as users of 'timeval' often suffer from
the time_t overflow in y2038. I have gone through this code and
found that it is unlikely to cause problems here:
- The user space ABI does not use time_t or timeval, but uses
'u32' and 'long' as the types. This means at least that rebuilding
user programs against a new libc with 64-bit time_t does not
change the ABI.
- As of commit c61eef726a
("drm: add support for monotonic vblank
timestamps") in linux-3.8, the monotonic timestamp is the default
and can only get reverted to wall-clock through a module-parameter.
- With the default monotonic timestamps, there is no problem at all.
- The drm_wait_vblank_ioctl() interface is alway safe on 64-bit
architectures, on 32-bit it might overflow the 'long' timestamps
in 2038 with wall-clock timestamps.
- The event handling uses 'u32' seconds, which overflow in 2106
on both 32-bit and 64-bit machines, when wall-clock timestamps
are used.
- The effect of overflowing either of the two is only temporary
(during the overflow, and is likely to keep working again
afterwards. It is likely the same problem as observing a
'settimeofday()' call, which was the reason for moving to the
monotonic timestamps in the first place.
Overall, this seems good enough, so my patch removes the use of
'timeval' from the vblank handling altogether and uses ktime_t
consistently, except for the part where we copy the data to user
space structures in the existing format.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
640 lines
20 KiB
C
640 lines
20 KiB
C
/*
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* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* Copyright (c) 2009-2010, Code Aurora Forum.
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* Copyright 2016 Intel Corp.
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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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#ifndef _DRM_DRV_H_
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#define _DRM_DRV_H_
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#include <linux/list.h>
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#include <linux/irqreturn.h>
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#include <drm/drm_device.h>
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struct drm_file;
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struct drm_gem_object;
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struct drm_master;
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struct drm_minor;
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struct dma_buf_attachment;
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struct drm_display_mode;
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struct drm_mode_create_dumb;
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/* driver capabilities and requirements mask */
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#define DRIVER_USE_AGP 0x1
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#define DRIVER_LEGACY 0x2
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#define DRIVER_PCI_DMA 0x8
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#define DRIVER_SG 0x10
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#define DRIVER_HAVE_DMA 0x20
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#define DRIVER_HAVE_IRQ 0x40
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#define DRIVER_IRQ_SHARED 0x80
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#define DRIVER_GEM 0x1000
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#define DRIVER_MODESET 0x2000
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#define DRIVER_PRIME 0x4000
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#define DRIVER_RENDER 0x8000
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#define DRIVER_ATOMIC 0x10000
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#define DRIVER_KMS_LEGACY_CONTEXT 0x20000
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#define DRIVER_SYNCOBJ 0x40000
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/**
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* struct drm_driver - DRM driver structure
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*
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* This structure represent the common code for a family of cards. There will
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* one drm_device for each card present in this family. It contains lots of
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* vfunc entries, and a pile of those probably should be moved to more
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* appropriate places like &drm_mode_config_funcs or into a new operations
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* structure for GEM drivers.
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*/
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struct drm_driver {
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/**
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* @load:
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*
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* Backward-compatible driver callback to complete
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* initialization steps after the driver is registered. For
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* this reason, may suffer from race conditions and its use is
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* deprecated for new drivers. It is therefore only supported
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* for existing drivers not yet converted to the new scheme.
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* See drm_dev_init() and drm_dev_register() for proper and
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* race-free way to set up a &struct drm_device.
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*
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* This is deprecated, do not use!
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*
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* Returns:
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*
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* Zero on success, non-zero value on failure.
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*/
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int (*load) (struct drm_device *, unsigned long flags);
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/**
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* @open:
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*
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* Driver callback when a new &struct drm_file is opened. Useful for
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* setting up driver-private data structures like buffer allocators,
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* execution contexts or similar things. Such driver-private resources
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* must be released again in @postclose.
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*
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* Since the display/modeset side of DRM can only be owned by exactly
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* one &struct drm_file (see &drm_file.is_master and &drm_device.master)
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* there should never be a need to set up any modeset related resources
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* in this callback. Doing so would be a driver design bug.
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*
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* Returns:
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*
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* 0 on success, a negative error code on failure, which will be
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* promoted to userspace as the result of the open() system call.
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*/
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int (*open) (struct drm_device *, struct drm_file *);
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/**
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* @postclose:
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*
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* One of the driver callbacks when a new &struct drm_file is closed.
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* Useful for tearing down driver-private data structures allocated in
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* @open like buffer allocators, execution contexts or similar things.
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*
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* Since the display/modeset side of DRM can only be owned by exactly
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* one &struct drm_file (see &drm_file.is_master and &drm_device.master)
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* there should never be a need to tear down any modeset related
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* resources in this callback. Doing so would be a driver design bug.
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*/
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void (*postclose) (struct drm_device *, struct drm_file *);
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/**
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* @lastclose:
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*
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* Called when the last &struct drm_file has been closed and there's
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* currently no userspace client for the &struct drm_device.
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*
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* Modern drivers should only use this to force-restore the fbdev
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* framebuffer using drm_fb_helper_restore_fbdev_mode_unlocked().
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* Anything else would indicate there's something seriously wrong.
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* Modern drivers can also use this to execute delayed power switching
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* state changes, e.g. in conjunction with the :ref:`vga_switcheroo`
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* infrastructure.
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*
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* This is called after @postclose hook has been called.
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*
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* NOTE:
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*
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* All legacy drivers use this callback to de-initialize the hardware.
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* This is purely because of the shadow-attach model, where the DRM
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* kernel driver does not really own the hardware. Instead ownershipe is
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* handled with the help of userspace through an inheritedly racy dance
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* to set/unset the VT into raw mode.
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*
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* Legacy drivers initialize the hardware in the @firstopen callback,
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* which isn't even called for modern drivers.
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*/
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void (*lastclose) (struct drm_device *);
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/**
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* @unload:
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*
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* Reverse the effects of the driver load callback. Ideally,
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* the clean up performed by the driver should happen in the
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* reverse order of the initialization. Similarly to the load
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* hook, this handler is deprecated and its usage should be
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* dropped in favor of an open-coded teardown function at the
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* driver layer. See drm_dev_unregister() and drm_dev_put()
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* for the proper way to remove a &struct drm_device.
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*
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* The unload() hook is called right after unregistering
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* the device.
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*
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*/
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void (*unload) (struct drm_device *);
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/**
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* @release:
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*
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* Optional callback for destroying device data after the final
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* reference is released, i.e. the device is being destroyed. Drivers
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* using this callback are responsible for calling drm_dev_fini()
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* to finalize the device and then freeing the struct themselves.
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*/
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void (*release) (struct drm_device *);
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/**
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* @get_vblank_counter:
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*
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* Driver callback for fetching a raw hardware vblank counter for the
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* CRTC specified with the pipe argument. If a device doesn't have a
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* hardware counter, the driver can simply leave the hook as NULL.
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* The DRM core will account for missed vblank events while interrupts
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* where disabled based on system timestamps.
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*
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* Wraparound handling and loss of events due to modesetting is dealt
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* with in the DRM core code, as long as drivers call
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* drm_crtc_vblank_off() and drm_crtc_vblank_on() when disabling or
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* enabling a CRTC.
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*
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* This is deprecated and should not be used by new drivers.
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* Use &drm_crtc_funcs.get_vblank_counter instead.
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*
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* Returns:
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*
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* Raw vblank counter value.
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*/
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u32 (*get_vblank_counter) (struct drm_device *dev, unsigned int pipe);
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/**
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* @enable_vblank:
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*
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* Enable vblank interrupts for the CRTC specified with the pipe
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* argument.
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*
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* This is deprecated and should not be used by new drivers.
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* Use &drm_crtc_funcs.enable_vblank instead.
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*
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* Returns:
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*
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* Zero on success, appropriate errno if the given @crtc's vblank
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* interrupt cannot be enabled.
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*/
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int (*enable_vblank) (struct drm_device *dev, unsigned int pipe);
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/**
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* @disable_vblank:
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*
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* Disable vblank interrupts for the CRTC specified with the pipe
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* argument.
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*
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* This is deprecated and should not be used by new drivers.
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* Use &drm_crtc_funcs.disable_vblank instead.
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*/
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void (*disable_vblank) (struct drm_device *dev, unsigned int pipe);
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/**
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* @get_scanout_position:
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*
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* Called by vblank timestamping code.
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*
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* Returns the current display scanout position from a crtc, and an
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* optional accurate ktime_get() timestamp of when position was
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* measured. Note that this is a helper callback which is only used if a
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* driver uses drm_calc_vbltimestamp_from_scanoutpos() for the
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* @get_vblank_timestamp callback.
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*
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* Parameters:
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*
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* dev:
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* DRM device.
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* pipe:
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* Id of the crtc to query.
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* in_vblank_irq:
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* True when called from drm_crtc_handle_vblank(). Some drivers
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* need to apply some workarounds for gpu-specific vblank irq quirks
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* if flag is set.
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* vpos:
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* Target location for current vertical scanout position.
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* hpos:
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* Target location for current horizontal scanout position.
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* stime:
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* Target location for timestamp taken immediately before
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* scanout position query. Can be NULL to skip timestamp.
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* etime:
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* Target location for timestamp taken immediately after
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* scanout position query. Can be NULL to skip timestamp.
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* mode:
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* Current display timings.
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*
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* Returns vpos as a positive number while in active scanout area.
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* Returns vpos as a negative number inside vblank, counting the number
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* of scanlines to go until end of vblank, e.g., -1 means "one scanline
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* until start of active scanout / end of vblank."
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*
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* Returns:
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*
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* True on success, false if a reliable scanout position counter could
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* not be read out.
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*
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* FIXME:
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*
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* Since this is a helper to implement @get_vblank_timestamp, we should
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* move it to &struct drm_crtc_helper_funcs, like all the other
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* helper-internal hooks.
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*/
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bool (*get_scanout_position) (struct drm_device *dev, unsigned int pipe,
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bool in_vblank_irq, int *vpos, int *hpos,
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ktime_t *stime, ktime_t *etime,
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const struct drm_display_mode *mode);
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/**
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* @get_vblank_timestamp:
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*
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* Called by drm_get_last_vbltimestamp(). Should return a precise
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* timestamp when the most recent VBLANK interval ended or will end.
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*
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* Specifically, the timestamp in @vblank_time should correspond as
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* closely as possible to the time when the first video scanline of
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* the video frame after the end of VBLANK will start scanning out,
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* the time immediately after end of the VBLANK interval. If the
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* @crtc is currently inside VBLANK, this will be a time in the future.
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* If the @crtc is currently scanning out a frame, this will be the
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* past start time of the current scanout. This is meant to adhere
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* to the OpenML OML_sync_control extension specification.
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*
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* Paramters:
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*
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* dev:
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* dev DRM device handle.
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* pipe:
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* crtc for which timestamp should be returned.
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* max_error:
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* Maximum allowable timestamp error in nanoseconds.
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* Implementation should strive to provide timestamp
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* with an error of at most max_error nanoseconds.
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* Returns true upper bound on error for timestamp.
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* vblank_time:
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* Target location for returned vblank timestamp.
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* in_vblank_irq:
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* True when called from drm_crtc_handle_vblank(). Some drivers
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* need to apply some workarounds for gpu-specific vblank irq quirks
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* if flag is set.
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*
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* Returns:
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*
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* True on success, false on failure, which means the core should
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* fallback to a simple timestamp taken in drm_crtc_handle_vblank().
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*
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* FIXME:
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*
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* We should move this hook to &struct drm_crtc_funcs like all the other
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* vblank hooks.
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*/
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bool (*get_vblank_timestamp) (struct drm_device *dev, unsigned int pipe,
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int *max_error,
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ktime_t *vblank_time,
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bool in_vblank_irq);
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/**
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* @irq_handler:
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*
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* Interrupt handler called when using drm_irq_install(). Not used by
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* drivers which implement their own interrupt handling.
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*/
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irqreturn_t(*irq_handler) (int irq, void *arg);
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/**
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* @irq_preinstall:
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*
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* Optional callback used by drm_irq_install() which is called before
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* the interrupt handler is registered. This should be used to clear out
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* any pending interrupts (from e.g. firmware based drives) and reset
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* the interrupt handling registers.
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*/
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void (*irq_preinstall) (struct drm_device *dev);
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/**
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* @irq_postinstall:
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*
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* Optional callback used by drm_irq_install() which is called after
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* the interrupt handler is registered. This should be used to enable
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* interrupt generation in the hardware.
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*/
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int (*irq_postinstall) (struct drm_device *dev);
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/**
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* @irq_uninstall:
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*
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* Optional callback used by drm_irq_uninstall() which is called before
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* the interrupt handler is unregistered. This should be used to disable
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* interrupt generation in the hardware.
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*/
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void (*irq_uninstall) (struct drm_device *dev);
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/**
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* @master_create:
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*
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* Called whenever a new master is created. Only used by vmwgfx.
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*/
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int (*master_create)(struct drm_device *dev, struct drm_master *master);
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/**
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* @master_destroy:
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*
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* Called whenever a master is destroyed. Only used by vmwgfx.
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*/
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void (*master_destroy)(struct drm_device *dev, struct drm_master *master);
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/**
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* @master_set:
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*
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* Called whenever the minor master is set. Only used by vmwgfx.
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*/
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int (*master_set)(struct drm_device *dev, struct drm_file *file_priv,
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bool from_open);
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/**
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* @master_drop:
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*
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* Called whenever the minor master is dropped. Only used by vmwgfx.
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*/
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void (*master_drop)(struct drm_device *dev, struct drm_file *file_priv);
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/**
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* @debugfs_init:
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*
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* Allows drivers to create driver-specific debugfs files.
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*/
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int (*debugfs_init)(struct drm_minor *minor);
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/**
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* @gem_free_object: deconstructor for drm_gem_objects
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*
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* This is deprecated and should not be used by new drivers. Use
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* @gem_free_object_unlocked instead.
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*/
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void (*gem_free_object) (struct drm_gem_object *obj);
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/**
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* @gem_free_object_unlocked: deconstructor for drm_gem_objects
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*
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* This is for drivers which are not encumbered with &drm_device.struct_mutex
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* legacy locking schemes. Use this hook instead of @gem_free_object.
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*/
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void (*gem_free_object_unlocked) (struct drm_gem_object *obj);
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/**
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* @gem_open_object:
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*
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* Driver hook called upon gem handle creation
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*/
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int (*gem_open_object) (struct drm_gem_object *, struct drm_file *);
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/**
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* @gem_close_object:
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*
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* Driver hook called upon gem handle release
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*/
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void (*gem_close_object) (struct drm_gem_object *, struct drm_file *);
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/**
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* @gem_create_object: constructor for gem objects
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*
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* Hook for allocating the GEM object struct, for use by core
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* helpers.
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*/
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struct drm_gem_object *(*gem_create_object)(struct drm_device *dev,
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size_t size);
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/* prime: */
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/**
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* @prime_handle_to_fd:
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*
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* export handle -> fd (see drm_gem_prime_handle_to_fd() helper)
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*/
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int (*prime_handle_to_fd)(struct drm_device *dev, struct drm_file *file_priv,
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uint32_t handle, uint32_t flags, int *prime_fd);
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/**
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* @prime_fd_to_handle:
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*
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* import fd -> handle (see drm_gem_prime_fd_to_handle() helper)
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*/
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int (*prime_fd_to_handle)(struct drm_device *dev, struct drm_file *file_priv,
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int prime_fd, uint32_t *handle);
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/**
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* @gem_prime_export:
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*
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* export GEM -> dmabuf
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*/
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struct dma_buf * (*gem_prime_export)(struct drm_device *dev,
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struct drm_gem_object *obj, int flags);
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/**
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* @gem_prime_import:
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*
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* import dmabuf -> GEM
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*/
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struct drm_gem_object * (*gem_prime_import)(struct drm_device *dev,
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struct dma_buf *dma_buf);
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int (*gem_prime_pin)(struct drm_gem_object *obj);
|
|
void (*gem_prime_unpin)(struct drm_gem_object *obj);
|
|
struct reservation_object * (*gem_prime_res_obj)(
|
|
struct drm_gem_object *obj);
|
|
struct sg_table *(*gem_prime_get_sg_table)(struct drm_gem_object *obj);
|
|
struct drm_gem_object *(*gem_prime_import_sg_table)(
|
|
struct drm_device *dev,
|
|
struct dma_buf_attachment *attach,
|
|
struct sg_table *sgt);
|
|
void *(*gem_prime_vmap)(struct drm_gem_object *obj);
|
|
void (*gem_prime_vunmap)(struct drm_gem_object *obj, void *vaddr);
|
|
int (*gem_prime_mmap)(struct drm_gem_object *obj,
|
|
struct vm_area_struct *vma);
|
|
|
|
/**
|
|
* @dumb_create:
|
|
*
|
|
* This creates a new dumb buffer in the driver's backing storage manager (GEM,
|
|
* TTM or something else entirely) and returns the resulting buffer handle. This
|
|
* handle can then be wrapped up into a framebuffer modeset object.
|
|
*
|
|
* Note that userspace is not allowed to use such objects for render
|
|
* acceleration - drivers must create their own private ioctls for such a use
|
|
* case.
|
|
*
|
|
* Width, height and depth are specified in the &drm_mode_create_dumb
|
|
* argument. The callback needs to fill the handle, pitch and size for
|
|
* the created buffer.
|
|
*
|
|
* Called by the user via ioctl.
|
|
*
|
|
* Returns:
|
|
*
|
|
* Zero on success, negative errno on failure.
|
|
*/
|
|
int (*dumb_create)(struct drm_file *file_priv,
|
|
struct drm_device *dev,
|
|
struct drm_mode_create_dumb *args);
|
|
/**
|
|
* @dumb_map_offset:
|
|
*
|
|
* Allocate an offset in the drm device node's address space to be able to
|
|
* memory map a dumb buffer. GEM-based drivers must use
|
|
* drm_gem_create_mmap_offset() to implement this.
|
|
*
|
|
* Called by the user via ioctl.
|
|
*
|
|
* Returns:
|
|
*
|
|
* Zero on success, negative errno on failure.
|
|
*/
|
|
int (*dumb_map_offset)(struct drm_file *file_priv,
|
|
struct drm_device *dev, uint32_t handle,
|
|
uint64_t *offset);
|
|
/**
|
|
* @dumb_destroy:
|
|
*
|
|
* This destroys the userspace handle for the given dumb backing storage buffer.
|
|
* Since buffer objects must be reference counted in the kernel a buffer object
|
|
* won't be immediately freed if a framebuffer modeset object still uses it.
|
|
*
|
|
* Called by the user via ioctl.
|
|
*
|
|
* Returns:
|
|
*
|
|
* Zero on success, negative errno on failure.
|
|
*/
|
|
int (*dumb_destroy)(struct drm_file *file_priv,
|
|
struct drm_device *dev,
|
|
uint32_t handle);
|
|
|
|
/**
|
|
* @gem_vm_ops: Driver private ops for this object
|
|
*/
|
|
const struct vm_operations_struct *gem_vm_ops;
|
|
|
|
/** @major: driver major number */
|
|
int major;
|
|
/** @minor: driver minor number */
|
|
int minor;
|
|
/** @patchlevel: driver patch level */
|
|
int patchlevel;
|
|
/** @name: driver name */
|
|
char *name;
|
|
/** @desc: driver description */
|
|
char *desc;
|
|
/** @date: driver date */
|
|
char *date;
|
|
|
|
/** @driver_features: driver features */
|
|
u32 driver_features;
|
|
|
|
/**
|
|
* @ioctls:
|
|
*
|
|
* Array of driver-private IOCTL description entries. See the chapter on
|
|
* :ref:`IOCTL support in the userland interfaces
|
|
* chapter<drm_driver_ioctl>` for the full details.
|
|
*/
|
|
|
|
const struct drm_ioctl_desc *ioctls;
|
|
/** @num_ioctls: Number of entries in @ioctls. */
|
|
int num_ioctls;
|
|
|
|
/**
|
|
* @fops:
|
|
*
|
|
* File operations for the DRM device node. See the discussion in
|
|
* :ref:`file operations<drm_driver_fops>` for in-depth coverage and
|
|
* some examples.
|
|
*/
|
|
const struct file_operations *fops;
|
|
|
|
/* Everything below here is for legacy driver, never use! */
|
|
/* private: */
|
|
|
|
/* List of devices hanging off this driver with stealth attach. */
|
|
struct list_head legacy_dev_list;
|
|
int (*firstopen) (struct drm_device *);
|
|
void (*preclose) (struct drm_device *, struct drm_file *file_priv);
|
|
int (*dma_ioctl) (struct drm_device *dev, void *data, struct drm_file *file_priv);
|
|
int (*dma_quiescent) (struct drm_device *);
|
|
int (*context_dtor) (struct drm_device *dev, int context);
|
|
int dev_priv_size;
|
|
};
|
|
|
|
__printf(6, 7)
|
|
void drm_dev_printk(const struct device *dev, const char *level,
|
|
unsigned int category, const char *function_name,
|
|
const char *prefix, const char *format, ...);
|
|
__printf(3, 4)
|
|
void drm_printk(const char *level, unsigned int category,
|
|
const char *format, ...);
|
|
extern unsigned int drm_debug;
|
|
|
|
int drm_dev_init(struct drm_device *dev,
|
|
struct drm_driver *driver,
|
|
struct device *parent);
|
|
void drm_dev_fini(struct drm_device *dev);
|
|
|
|
struct drm_device *drm_dev_alloc(struct drm_driver *driver,
|
|
struct device *parent);
|
|
int drm_dev_register(struct drm_device *dev, unsigned long flags);
|
|
void drm_dev_unregister(struct drm_device *dev);
|
|
|
|
void drm_dev_get(struct drm_device *dev);
|
|
void drm_dev_put(struct drm_device *dev);
|
|
void drm_dev_unref(struct drm_device *dev);
|
|
void drm_put_dev(struct drm_device *dev);
|
|
void drm_dev_unplug(struct drm_device *dev);
|
|
|
|
/**
|
|
* drm_dev_is_unplugged - is a DRM device unplugged
|
|
* @dev: DRM device
|
|
*
|
|
* This function can be called to check whether a hotpluggable is unplugged.
|
|
* Unplugging itself is singalled through drm_dev_unplug(). If a device is
|
|
* unplugged, these two functions guarantee that any store before calling
|
|
* drm_dev_unplug() is visible to callers of this function after it completes
|
|
*/
|
|
static inline int drm_dev_is_unplugged(struct drm_device *dev)
|
|
{
|
|
int ret = atomic_read(&dev->unplugged);
|
|
smp_rmb();
|
|
return ret;
|
|
}
|
|
|
|
|
|
int drm_dev_set_unique(struct drm_device *dev, const char *name);
|
|
|
|
|
|
#endif
|