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https://gitlab.freedesktop.org/mesa/drm.git
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25e319c1ef
DRM_IOCTL_VIA_DMA_INIT DRM_IOCTL_VIA_CMDBUFFER DRM_IOCTL_VIA_FLUSH
The first ioctl sets up an area in AGP memory that will be used as the ring
buffer. The second ioctl copies a command buffer from user space memory
to the ring buffer. The third ioctl waits for engine idle until it
returns.
The motivation for this patch is to avoid the wait for engine idle call
before each buffer flush in the current DRI driver. With this patch,
the DRI driver can continue to flush its buffer as long as there is
free space in the ring buffer.
This patch adds an additional copy operation on the command buffer. This
buffer copying is necessary to support multiple DRI clients rendering
simultaneously. Otherwise, more CPU time will be spent in the busy loop
waiting for engine idle between DRI context switch. Even in the single
client case, the tradeoff is reasonable in comparision to the kernel
call to check for free buffer space for the client to render directly
to the ring buffer.
71 lines
2.6 KiB
C
71 lines
2.6 KiB
C
/*
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* Copyright 1998-2003 VIA Technologies, Inc. All Rights Reserved.
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* Copyright 2001-2003 S3 Graphics, Inc. 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, sub license,
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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
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* next paragraph) shall be included in all copies or substantial portions
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* of the 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 NON-INFRINGEMENT. IN NO EVENT SHALL
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* VIA, S3 GRAPHICS, 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 OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include <linux/config.h>
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#include "via.h"
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#include "drmP.h"
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#include "via_drm.h"
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#include "via_drv.h"
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#define DRIVER_AUTHOR "VIA"
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#define DRIVER_NAME "via"
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#define DRIVER_DESC "VIA Unichrome"
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#define DRIVER_DATE "20040819"
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#define DRIVER_MAJOR 1
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#define DRIVER_MINOR 4
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#define DRIVER_PATCHLEVEL 0
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#define DRIVER_IOCTLS \
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[DRM_IOCTL_NR(DRM_IOCTL_VIA_ALLOCMEM)] = { via_mem_alloc, 1, 0 }, \
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[DRM_IOCTL_NR(DRM_IOCTL_VIA_FREEMEM)] = { via_mem_free, 1, 0 }, \
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[DRM_IOCTL_NR(DRM_IOCTL_VIA_AGP_INIT)] = { via_agp_init, 1, 0 }, \
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[DRM_IOCTL_NR(DRM_IOCTL_VIA_FB_INIT)] = { via_fb_init, 1, 0 }, \
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[DRM_IOCTL_NR(DRM_IOCTL_VIA_MAP_INIT)] = { via_map_init, 1, 0 }, \
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[DRM_IOCTL_NR(DRM_IOCTL_VIA_DEC_FUTEX)] = { via_decoder_futex, 1, 0}, \
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[DRM_IOCTL_NR(DRM_IOCTL_VIA_DMA_INIT)] = { via_dma_init, 1, 0}, \
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[DRM_IOCTL_NR(DRM_IOCTL_VIA_CMDBUFFER)] = { via_cmdbuffer, 1, 0}, \
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[DRM_IOCTL_NR(DRM_IOCTL_VIA_FLUSH)] = { via_flush_ioctl, 1, 0}
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#define __HAVE_COUNTERS 0
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#include "drm_auth.h"
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#include "drm_agpsupport.h"
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#include "drm_bufs.h"
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#include "drm_context.h"
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#include "drm_dma.h"
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#include "drm_irq.h"
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#include "drm_drawable.h"
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#include "drm_drv.h"
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#include "drm_fops.h"
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#include "drm_init.h"
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#include "drm_ioctl.h"
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#include "drm_lock.h"
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#include "drm_memory.h"
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#include "drm_proc.h"
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#include "drm_vm.h"
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#include "drm_stub.h"
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