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69de4421bb
We create a bunch of debugfs entries as a side-effect of ttm_global_init() and then never clean them up. This isn't usually a problem because we free the whole debugfs directory on module unload. However, if the global reference count ever goes to zero and then ttm_global_init() is called again, we'll re-create those debugfs entries and debugfs will complain in dmesg that we're creating entries that already exist. This patch fixes this problem by changing the lifetime of the whole TTM debugfs directory to match that of the TTM global state. Signed-off-by: Jason Ekstrand <jason@jlekstrand.net> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20210721152358.2893314-6-jason@jlekstrand.net
78 lines
2.7 KiB
C
78 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 OR MIT */
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/**************************************************************************
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*
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* Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
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* 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
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* 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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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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/*
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* Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
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* Jerome Glisse
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*/
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/pgtable.h>
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#include <linux/sched.h>
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#include <linux/debugfs.h>
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#include <drm/drm_sysfs.h>
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#include <drm/ttm/ttm_caching.h>
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#include "ttm_module.h"
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/**
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* ttm_prot_from_caching - Modify the page protection according to the
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* ttm cacing mode
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* @caching: The ttm caching mode
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* @tmp: The original page protection
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*
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* Return: The modified page protection
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*/
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pgprot_t ttm_prot_from_caching(enum ttm_caching caching, pgprot_t tmp)
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{
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/* Cached mappings need no adjustment */
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if (caching == ttm_cached)
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return tmp;
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#if defined(__i386__) || defined(__x86_64__)
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if (caching == ttm_write_combined)
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tmp = pgprot_writecombine(tmp);
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else if (boot_cpu_data.x86 > 3)
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tmp = pgprot_noncached(tmp);
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#endif
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#if defined(__ia64__) || defined(__arm__) || defined(__aarch64__) || \
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defined(__powerpc__) || defined(__mips__)
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if (caching == ttm_write_combined)
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tmp = pgprot_writecombine(tmp);
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else
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tmp = pgprot_noncached(tmp);
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#endif
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#if defined(__sparc__)
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tmp = pgprot_noncached(tmp);
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#endif
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return tmp;
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}
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MODULE_AUTHOR("Thomas Hellstrom, Jerome Glisse");
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MODULE_DESCRIPTION("TTM memory manager subsystem (for DRM device)");
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MODULE_LICENSE("GPL and additional rights");
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