linux-stable/drivers/gpu/drm/drm_dumb_buffers.c
Dave Airlie eab9766931 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)
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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
2018-06-28 13:29:07 +10:00

150 lines
5 KiB
C

/*
* Copyright (c) 2006-2008 Intel Corporation
* Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
* Copyright (c) 2008 Red Hat Inc.
* Copyright (c) 2016 Intel Corporation
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting documentation, and
* that the name of the copyright holders not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. The copyright holders make no representations
* about the suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
#include <drm/drmP.h>
#include <drm/drm_gem.h>
#include "drm_crtc_internal.h"
/**
* DOC: overview
*
* The KMS API doesn't standardize backing storage object creation and leaves it
* to driver-specific ioctls. Furthermore actually creating a buffer object even
* for GEM-based drivers is done through a driver-specific ioctl - GEM only has
* a common userspace interface for sharing and destroying objects. While not an
* issue for full-fledged graphics stacks that include device-specific userspace
* components (in libdrm for instance), this limit makes DRM-based early boot
* graphics unnecessarily complex.
*
* Dumb objects partly alleviate the problem by providing a standard API to
* create dumb buffers suitable for scanout, which can then be used to create
* KMS frame buffers.
*
* To support dumb objects drivers must implement the &drm_driver.dumb_create
* operation. &drm_driver.dumb_destroy defaults to drm_gem_dumb_destroy() if
* not set and &drm_driver.dumb_map_offset defaults to
* drm_gem_dumb_map_offset(). See the callbacks for further details.
*
* Note that dumb objects may not be used for gpu acceleration, as has been
* attempted on some ARM embedded platforms. Such drivers really must have
* a hardware-specific ioctl to allocate suitable buffer objects.
*/
int drm_mode_create_dumb(struct drm_device *dev,
struct drm_mode_create_dumb *args,
struct drm_file *file_priv)
{
u32 cpp, stride, size;
if (!dev->driver->dumb_create)
return -ENOSYS;
if (!args->width || !args->height || !args->bpp)
return -EINVAL;
/* overflow checks for 32bit size calculations */
if (args->bpp > U32_MAX - 8)
return -EINVAL;
cpp = DIV_ROUND_UP(args->bpp, 8);
if (cpp > U32_MAX / args->width)
return -EINVAL;
stride = cpp * args->width;
if (args->height > U32_MAX / stride)
return -EINVAL;
/* test for wrap-around */
size = args->height * stride;
if (PAGE_ALIGN(size) == 0)
return -EINVAL;
/*
* handle, pitch and size are output parameters. Zero them out to
* prevent drivers from accidentally using uninitialized data. Since
* not all existing userspace is clearing these fields properly we
* cannot reject IOCTL with garbage in them.
*/
args->handle = 0;
args->pitch = 0;
args->size = 0;
return dev->driver->dumb_create(file_priv, dev, args);
}
int drm_mode_create_dumb_ioctl(struct drm_device *dev,
void *data, struct drm_file *file_priv)
{
return drm_mode_create_dumb(dev, data, file_priv);
}
/**
* drm_mode_mmap_dumb_ioctl - create an mmap offset for a dumb backing storage buffer
* @dev: DRM device
* @data: ioctl data
* @file_priv: DRM file info
*
* Allocate an offset in the drm device node's address space to be able to
* memory map a dumb buffer.
*
* Called by the user via ioctl.
*
* Returns:
* Zero on success, negative errno on failure.
*/
int drm_mode_mmap_dumb_ioctl(struct drm_device *dev,
void *data, struct drm_file *file_priv)
{
struct drm_mode_map_dumb *args = data;
if (!dev->driver->dumb_create)
return -ENOSYS;
if (dev->driver->dumb_map_offset)
return dev->driver->dumb_map_offset(file_priv, dev,
args->handle,
&args->offset);
else
return drm_gem_dumb_map_offset(file_priv, dev, args->handle,
&args->offset);
}
int drm_mode_destroy_dumb(struct drm_device *dev, u32 handle,
struct drm_file *file_priv)
{
if (!dev->driver->dumb_create)
return -ENOSYS;
if (dev->driver->dumb_destroy)
return dev->driver->dumb_destroy(file_priv, dev, handle);
else
return drm_gem_dumb_destroy(file_priv, dev, handle);
}
int drm_mode_destroy_dumb_ioctl(struct drm_device *dev,
void *data, struct drm_file *file_priv)
{
struct drm_mode_destroy_dumb *args = data;
return drm_mode_destroy_dumb(dev, args->handle, file_priv);
}