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23baf831a3
MAX_ORDER currently defined as number of orders page allocator supports: user can ask buddy allocator for page order between 0 and MAX_ORDER-1. This definition is counter-intuitive and lead to number of bugs all over the kernel. Change the definition of MAX_ORDER to be inclusive: the range of orders user can ask from buddy allocator is 0..MAX_ORDER now. [kirill@shutemov.name: fix min() warning] Link: https://lkml.kernel.org/r/20230315153800.32wib3n5rickolvh@box [akpm@linux-foundation.org: fix another min_t warning] [kirill@shutemov.name: fixups per Zi Yan] Link: https://lkml.kernel.org/r/20230316232144.b7ic4cif4kjiabws@box.shutemov.name [akpm@linux-foundation.org: fix underlining in docs] Link: https://lore.kernel.org/oe-kbuild-all/202303191025.VRCTk6mP-lkp@intel.com/ Link: https://lkml.kernel.org/r/20230315113133.11326-11-kirill.shutemov@linux.intel.com Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Reviewed-by: Michael Ellerman <mpe@ellerman.id.au> [powerpc] Cc: "Kirill A. Shutemov" <kirill@shutemov.name> Cc: Zi Yan <ziy@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
92 lines
2.8 KiB
C
92 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 OR MIT */
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/*
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* Copyright 2020 Advanced Micro Devices, Inc.
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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, sublicense,
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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 shall be included in
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* all copies or substantial portions 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 NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) 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
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors: Christian König
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*/
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#ifndef _TTM_PAGE_POOL_H_
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#define _TTM_PAGE_POOL_H_
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#include <linux/mmzone.h>
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#include <linux/llist.h>
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#include <linux/spinlock.h>
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#include <drm/ttm/ttm_caching.h>
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struct device;
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struct ttm_tt;
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struct ttm_pool;
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struct ttm_operation_ctx;
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/**
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* struct ttm_pool_type - Pool for a certain memory type
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*
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* @pool: the pool we belong to, might be NULL for the global ones
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* @order: the allocation order our pages have
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* @caching: the caching type our pages have
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* @shrinker_list: our place on the global shrinker list
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* @lock: protection of the page list
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* @pages: the list of pages in the pool
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*/
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struct ttm_pool_type {
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struct ttm_pool *pool;
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unsigned int order;
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enum ttm_caching caching;
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struct list_head shrinker_list;
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spinlock_t lock;
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struct list_head pages;
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};
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/**
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* struct ttm_pool - Pool for all caching and orders
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*
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* @dev: the device we allocate pages for
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* @use_dma_alloc: if coherent DMA allocations should be used
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* @use_dma32: if GFP_DMA32 should be used
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* @caching: pools for each caching/order
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*/
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struct ttm_pool {
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struct device *dev;
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bool use_dma_alloc;
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bool use_dma32;
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struct {
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struct ttm_pool_type orders[MAX_ORDER + 1];
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} caching[TTM_NUM_CACHING_TYPES];
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};
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int ttm_pool_alloc(struct ttm_pool *pool, struct ttm_tt *tt,
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struct ttm_operation_ctx *ctx);
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void ttm_pool_free(struct ttm_pool *pool, struct ttm_tt *tt);
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void ttm_pool_init(struct ttm_pool *pool, struct device *dev,
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bool use_dma_alloc, bool use_dma32);
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void ttm_pool_fini(struct ttm_pool *pool);
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int ttm_pool_debugfs(struct ttm_pool *pool, struct seq_file *m);
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int ttm_pool_mgr_init(unsigned long num_pages);
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void ttm_pool_mgr_fini(void);
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#endif
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