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![Dave Airlie](/assets/img/avatar_default.png)
Cross-subsystem Changes: devicetree documentation dt-bindings defintions for sun8i (Jernej Skrabec) Core Changes: Consider drivers setting DRIVER_ATOMIC as atomic (Eric Anholt) Improvements for in-kernel clients (Noralf Trønnes) Export and rename drm_crtc_port_mask() (Jernej Skrabec) Driver Changes: v3d: Add looking for GPU scheduler jobs management (Eric Anholt) Add Ilitek ILI9881c panel driver(Maxime Ripard) rockchip: vop: fixup linebuffer mode calc error (Sandy Huang) tinydrm: new driver for ILI9341 display panels (David Lechner) sun4i: Add TCON TOP driver (Jernej Skrabec) -----BEGIN PGP SIGNATURE----- iQIcBAABAgAGBQJbNDKgAAoJEEN0HIUfOBk0+fkP/RLj9BYlPQcxbhXr8Z7fWX2p 6CoTLrfa1AB3kaNFXFdYZBgELFC7pIjcEaRrY+3X9LoLf/KHuxtRsB4MlbLmr8e0 qLaz3lNveVeJsi/8OM3m10lP63groZwOjaSII2dz4V4OFrRWdJ6MSIc7gtHh1Iy6 Gfmj3OlqTGjhBjUpNf1WThIsmb+24r2BbwTNrS1iQnPkQOoBHMu7jMBVa9EhospM riZY3wJNNokLjxdIDEc5g01FnWMHh+Z8EcXIrV2jP52aJkltqFy1fXmPBG21cVtr 1wiC66Flhpxv0yLxGMMulj+NdZwnCEErQqh2A/wYlhOY7sin7Fmk7Y5llhj9pUNy ODRSZrtRRVyLWpfGjwcaSOTcYGk8HHhqU8MoLQagXdV3StoZivlIf2Vh8I7K64Ik k9hc8Ugg/V26FUyY8d4vaXP6suE/ev4oIrZNxKdFDIHPc4/4qp3TCncNeLft4Br6 dg8qZTK47nMyPtEvm/Q+9B3UxZ85sAlPmRW0Ji/bEt06OG11zLcWNd+BuQ8JCAlk aad+H/j/xerpQ6mp6PJ/islN3oevW4gR/x/eKZ3Xdt7RJY/yy4CLsxRuiGsSzY7T XVSXrTuDnn0Judc9oETZAzZZeIhKiq+dqKnifr7imJKmXGxAx04LO0cToIzaOTsM 5gb+TL2IeQtYMfggNcZe =IXNj -----END PGP SIGNATURE----- Merge tag 'drm-misc-next-2018-06-27' of git://anongit.freedesktop.org/drm/drm-misc into drm-next drm-misc-next for 4.19: Cross-subsystem Changes: devicetree documentation dt-bindings defintions for sun8i (Jernej Skrabec) Core Changes: Consider drivers setting DRIVER_ATOMIC as atomic (Eric Anholt) Improvements for in-kernel clients (Noralf Trønnes) Export and rename drm_crtc_port_mask() (Jernej Skrabec) Driver Changes: v3d: Add looking for GPU scheduler jobs management (Eric Anholt) Add Ilitek ILI9881c panel driver(Maxime Ripard) rockchip: vop: fixup linebuffer mode calc error (Sandy Huang) tinydrm: new driver for ILI9341 display panels (David Lechner) sun4i: Add TCON TOP driver (Jernej Skrabec) Signed-off-by: Dave Airlie <airlied@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180628010018.GA10929@juma
150 lines
5 KiB
C
150 lines
5 KiB
C
/*
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* Copyright (c) 2006-2008 Intel Corporation
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* Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
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* Copyright (c) 2008 Red Hat Inc.
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* Copyright (c) 2016 Intel Corporation
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting documentation, and
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* that the name of the copyright holders not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. The copyright holders make no representations
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* about the suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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#include <drm/drmP.h>
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#include <drm/drm_gem.h>
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#include "drm_crtc_internal.h"
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/**
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* DOC: overview
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*
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* The KMS API doesn't standardize backing storage object creation and leaves it
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* to driver-specific ioctls. Furthermore actually creating a buffer object even
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* for GEM-based drivers is done through a driver-specific ioctl - GEM only has
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* a common userspace interface for sharing and destroying objects. While not an
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* issue for full-fledged graphics stacks that include device-specific userspace
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* components (in libdrm for instance), this limit makes DRM-based early boot
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* graphics unnecessarily complex.
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*
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* Dumb objects partly alleviate the problem by providing a standard API to
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* create dumb buffers suitable for scanout, which can then be used to create
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* KMS frame buffers.
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*
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* To support dumb objects drivers must implement the &drm_driver.dumb_create
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* operation. &drm_driver.dumb_destroy defaults to drm_gem_dumb_destroy() if
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* not set and &drm_driver.dumb_map_offset defaults to
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* drm_gem_dumb_map_offset(). See the callbacks for further details.
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*
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* Note that dumb objects may not be used for gpu acceleration, as has been
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* attempted on some ARM embedded platforms. Such drivers really must have
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* a hardware-specific ioctl to allocate suitable buffer objects.
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*/
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int drm_mode_create_dumb(struct drm_device *dev,
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struct drm_mode_create_dumb *args,
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struct drm_file *file_priv)
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{
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u32 cpp, stride, size;
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if (!dev->driver->dumb_create)
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return -ENOSYS;
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if (!args->width || !args->height || !args->bpp)
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return -EINVAL;
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/* overflow checks for 32bit size calculations */
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if (args->bpp > U32_MAX - 8)
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return -EINVAL;
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cpp = DIV_ROUND_UP(args->bpp, 8);
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if (cpp > U32_MAX / args->width)
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return -EINVAL;
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stride = cpp * args->width;
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if (args->height > U32_MAX / stride)
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return -EINVAL;
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/* test for wrap-around */
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size = args->height * stride;
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if (PAGE_ALIGN(size) == 0)
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return -EINVAL;
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/*
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* handle, pitch and size are output parameters. Zero them out to
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* prevent drivers from accidentally using uninitialized data. Since
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* not all existing userspace is clearing these fields properly we
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* cannot reject IOCTL with garbage in them.
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*/
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args->handle = 0;
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args->pitch = 0;
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args->size = 0;
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return dev->driver->dumb_create(file_priv, dev, args);
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}
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int drm_mode_create_dumb_ioctl(struct drm_device *dev,
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void *data, struct drm_file *file_priv)
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{
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return drm_mode_create_dumb(dev, data, file_priv);
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}
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/**
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* drm_mode_mmap_dumb_ioctl - create an mmap offset for a dumb backing storage buffer
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* @dev: DRM device
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* @data: ioctl data
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* @file_priv: DRM file info
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*
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* Allocate an offset in the drm device node's address space to be able to
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* memory map a dumb buffer.
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*
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* Called by the user via ioctl.
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*
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* Returns:
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* Zero on success, negative errno on failure.
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*/
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int drm_mode_mmap_dumb_ioctl(struct drm_device *dev,
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void *data, struct drm_file *file_priv)
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{
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struct drm_mode_map_dumb *args = data;
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if (!dev->driver->dumb_create)
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return -ENOSYS;
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if (dev->driver->dumb_map_offset)
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return dev->driver->dumb_map_offset(file_priv, dev,
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args->handle,
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&args->offset);
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else
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return drm_gem_dumb_map_offset(file_priv, dev, args->handle,
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&args->offset);
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}
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int drm_mode_destroy_dumb(struct drm_device *dev, u32 handle,
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struct drm_file *file_priv)
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{
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if (!dev->driver->dumb_create)
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return -ENOSYS;
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if (dev->driver->dumb_destroy)
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return dev->driver->dumb_destroy(file_priv, dev, handle);
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else
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return drm_gem_dumb_destroy(file_priv, dev, handle);
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}
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int drm_mode_destroy_dumb_ioctl(struct drm_device *dev,
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void *data, struct drm_file *file_priv)
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{
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struct drm_mode_destroy_dumb *args = data;
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return drm_mode_destroy_dumb(dev, args->handle, file_priv);
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}
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