renesas/drm.git - libdrm, cloned from git://anongit.freedesktop.org/mesa/drm

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author	Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>	2007-02-11 20:33:57 +0100
committer	Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>	2007-02-13 20:47:30 +0100
commit	e1460426b885ab656e3cda3fd3841d64260434c5 (patch)
tree	1a53dce1fbacbfb0df953fbc8f282eeb335cedf4 /linux-core/README.drm
parent	5bd13c5e15a14d34356f2363c55b1d4c7ca3269a (diff)

Bugzilla Bug #9457

Add refcounting of user waiters to the DRM hardware lock, so that we can use the DRM_LOCK_CONT flag more conservatively. Also add a kernel waiter refcount that if nonzero transfers the lock for the kernel context, when it is released. This is useful when waiting for idle and can be used for very simple fence object driver implementations for the new memory manager. It also resolves the AIGLX startup deadlock for the sis and the via drivers. i810, i830 still require that the hardware lock is really taken so the deadlock remains for those two. I'm not sure about ffb. Anyone familiar with that code?

Diffstat (limited to 'linux-core/README.drm')

0 files changed, 0 insertions, 0 deletions

/* -*- mode: C; c-file-style: "k&r"; tab-width 4; indent-tabs-mode: t; -*- */ /* * Copyright (C) 2013 Rob Clark <robclark@freedesktop.org> * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. * * Authors: * Rob Clark <robclark@freedesktop.org> */ #include "msm_priv.h" static int bo_allocate(struct msm_bo *msm_bo) { struct fd_bo *bo = &msm_bo->base; if (!msm_bo->offset) { struct drm_msm_gem_info req = { .handle = bo->handle, }; int ret; /* if the buffer is already backed by pages then this * doesn't actually do anything (other than giving us * the offset) */ ret = drmCommandWriteRead(bo->dev->fd, DRM_MSM_GEM_INFO, &req, sizeof(req)); if (ret) { ERROR_MSG("alloc failed: %s", strerror(errno)); return ret; } msm_bo->offset = req.offset; } return 0; } static int msm_bo_offset(struct fd_bo *bo, uint64_t *offset) { struct msm_bo *msm_bo = to_msm_bo(bo); int ret = bo_allocate(msm_bo); if (ret) return ret; *offset = msm_bo->offset; return 0; } static int msm_bo_cpu_prep(struct fd_bo *bo, struct fd_pipe *pipe, uint32_t op) { struct drm_msm_gem_cpu_prep req = { .handle = bo->handle, .op = op, };


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