| 1 |
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| 2 | |
| 3 | *
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| 4 | * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
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| 5 | * All Rights Reserved.
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| 6 | *
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| 7 | * Permission is hereby granted, free of charge, to any person obtaining a
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| 8 | * copy of this software and associated documentation files (the
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| 9 | * "Software"), to deal in the Software without restriction, including
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| 10 | * without limitation the rights to use, copy, modify, merge, publish,
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| 11 | * distribute, sub license, and/or sell copies of the Software, and to
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| 12 | * permit persons to whom the Software is furnished to do so, subject to
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| 13 | * the following conditions:
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| 14 | *
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| 15 | * The above copyright notice and this permission notice (including the
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| 16 | * next paragraph) shall be included in all copies or substantial portions
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| 17 | * of the Software.
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| 18 | *
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| 19 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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| 20 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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| 21 | * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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| 22 | * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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| 23 | * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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| 24 | * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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| 25 | * USE OR OTHER DEALINGS IN THE SOFTWARE.
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| 26 | *
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| 27 | *************************************************************************
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| 28 | |
| 29 | * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
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| 30 | * Jerome Glisse
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| 31 |
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| 32 | #include <linux/module.h>
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| 33 | #include <linux/device.h>
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| 34 | #include <linux/pgtable.h>
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| 35 | #include <linux/sched.h>
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| 36 | #include <linux/debugfs.h>
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| 37 | #include <drm/drm_sysfs.h>
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| 38 | #include <drm/ttm/ttm_caching.h>
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| 39 |
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| 40 | #include "ttm_module.h"
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| 41 |
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| 42 | |
| 43 | * DOC: TTM
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| 44 | *
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| 45 | * TTM is a memory manager for accelerator devices with dedicated memory.
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| 46 | *
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| 47 | * The basic idea is that resources are grouped together in buffer objects of
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| 48 | * certain size and TTM handles lifetime, movement and CPU mappings of those
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| 49 | * objects.
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| 50 | *
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| 51 | * TODO: Add more design background and information here.
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| 52 |
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| 53 |
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| 54 | |
| 55 | * ttm_prot_from_caching - Modify the page protection according to the
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| 56 | * ttm cacing mode
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| 57 | * @caching: The ttm caching mode
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| 58 | * @tmp: The original page protection
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| 59 | *
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| 60 | * Return: The modified page protection
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| 61 |
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| 62 | pgprot_t ttm_prot_from_caching(enum ttm_caching caching, pgprot_t tmp)
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| 63 | {
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| 64 |
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| 65 | if (caching == ttm_cached)
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| 66 | return tmp;
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| 67 |
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| 68 | #if defined(__i386__) || defined(__x86_64__)
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| 69 | if (caching == ttm_write_combined)
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| 70 | tmp = pgprot_writecombine(tmp);
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| 71 | #ifndef CONFIG_UML
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| 72 | else if (boot_cpu_data.x86 > 3)
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| 73 | tmp = pgprot_noncached(tmp);
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| 74 | #endif
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| 75 | #endif
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| 76 | #if defined(__ia64__) || defined(__arm__) || defined(__aarch64__) || \
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| 77 | defined(__powerpc__) || defined(__mips__) || defined(__loongarch__) || \
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| 78 | defined(__riscv)
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| 79 | if (caching == ttm_write_combined)
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| 80 | tmp = pgprot_writecombine(tmp);
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| 81 | else
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| 82 | tmp = pgprot_noncached(tmp);
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| 83 | #endif
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| 84 | #if defined(__sparc__)
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| 85 | tmp = pgprot_noncached(tmp);
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| 86 | #endif
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| 87 | return tmp;
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| 88 | }
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| 89 |
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| 90 | MODULE_AUTHOR("Thomas Hellstrom, Jerome Glisse");
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| 91 | MODULE_DESCRIPTION("TTM memory manager subsystem (for DRM device)");
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| 92 | MODULE_LICENSE("GPL and additional rights");
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