forked from KolibriOS/kolibrios
295 lines
7.0 KiB
C
295 lines
7.0 KiB
C
/*
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* Copyright (c) Red Hat Inc.
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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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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* 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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* Authors: Dave Airlie <airlied@redhat.com>
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* Jerome Glisse <jglisse@redhat.com>
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* Pauli Nieminen <suokkos@gmail.com>
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*/
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/* simple list based uncached page pool
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* - Pool collects resently freed pages for reuse
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* - Use page->lru to keep a free list
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* - doesn't track currently in use pages
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*/
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#define pr_fmt(fmt) "[TTM] " fmt
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#include <linux/list.h>
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#include <linux/spinlock.h>
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//#include <linux/highmem.h>
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//#include <linux/mm_types.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/seq_file.h> /* for seq_printf */
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#include <linux/slab.h>
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//#include <linux/dma-mapping.h>
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#include <linux/atomic.h>
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#include <drm/ttm/ttm_bo_driver.h>
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#include <drm/ttm/ttm_page_alloc.h>
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#ifdef TTM_HAS_AGP
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#include <asm/agp.h>
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#endif
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#define NUM_PAGES_TO_ALLOC (PAGE_SIZE/sizeof(struct page *))
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#define SMALL_ALLOCATION 16
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#define FREE_ALL_PAGES (~0U)
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/* times are in msecs */
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#define PAGE_FREE_INTERVAL 1000
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/**
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* struct ttm_page_pool - Pool to reuse recently allocated uc/wc pages.
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*
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* @lock: Protects the shared pool from concurrnet access. Must be used with
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* irqsave/irqrestore variants because pool allocator maybe called from
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* delayed work.
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* @fill_lock: Prevent concurrent calls to fill.
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* @list: Pool of free uc/wc pages for fast reuse.
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* @gfp_flags: Flags to pass for alloc_page.
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* @npages: Number of pages in pool.
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*/
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struct ttm_page_pool {
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spinlock_t lock;
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bool fill_lock;
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struct list_head list;
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gfp_t gfp_flags;
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unsigned npages;
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char *name;
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unsigned long nfrees;
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unsigned long nrefills;
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};
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/**
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* Limits for the pool. They are handled without locks because only place where
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* they may change is in sysfs store. They won't have immediate effect anyway
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* so forcing serialization to access them is pointless.
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*/
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struct ttm_pool_opts {
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unsigned alloc_size;
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unsigned max_size;
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unsigned small;
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};
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#define NUM_POOLS 4
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/**
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* struct ttm_pool_manager - Holds memory pools for fst allocation
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*
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* Manager is read only object for pool code so it doesn't need locking.
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*
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* @free_interval: minimum number of jiffies between freeing pages from pool.
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* @page_alloc_inited: reference counting for pool allocation.
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* @work: Work that is used to shrink the pool. Work is only run when there is
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* some pages to free.
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* @small_allocation: Limit in number of pages what is small allocation.
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*
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* @pools: All pool objects in use.
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**/
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struct ttm_pool_manager {
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struct kobject kobj;
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struct ttm_pool_opts options;
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union {
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struct ttm_page_pool pools[NUM_POOLS];
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struct {
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struct ttm_page_pool wc_pool;
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struct ttm_page_pool uc_pool;
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struct ttm_page_pool wc_pool_dma32;
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struct ttm_page_pool uc_pool_dma32;
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} ;
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};
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};
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static struct ttm_pool_manager *_manager;
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/**
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* Select the right pool or requested caching state and ttm flags. */
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static struct ttm_page_pool *ttm_get_pool(int flags,
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enum ttm_caching_state cstate)
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{
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int pool_index;
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if (cstate == tt_cached)
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return NULL;
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if (cstate == tt_wc)
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pool_index = 0x0;
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else
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pool_index = 0x1;
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if (flags & TTM_PAGE_FLAG_DMA32)
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pool_index |= 0x2;
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return &_manager->pools[pool_index];
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}
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/* set memory back to wb and free the pages. */
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static void ttm_pages_put(struct page *pages[], unsigned npages)
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{
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unsigned i;
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for (i = 0; i < npages; ++i)
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__free_page(pages[i]);
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}
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static void ttm_pool_update_free_locked(struct ttm_page_pool *pool,
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unsigned freed_pages)
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{
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pool->npages -= freed_pages;
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pool->nfrees += freed_pages;
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}
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/* Put all pages in pages list to correct pool to wait for reuse */
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static void ttm_put_pages(struct page **pages, unsigned npages, int flags,
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enum ttm_caching_state cstate)
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{
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unsigned long irq_flags;
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struct ttm_page_pool *pool = ttm_get_pool(flags, cstate);
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unsigned i;
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if (1) {
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/* No pool for this memory type so free the pages */
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for (i = 0; i < npages; i++) {
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if (pages[i]) {
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__free_page(pages[i]);
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pages[i] = NULL;
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}
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}
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return;
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}
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}
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/*
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* On success pages list will hold count number of correctly
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* cached pages.
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*/
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static int ttm_get_pages(struct page **pages, unsigned npages, int flags,
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enum ttm_caching_state cstate)
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{
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struct ttm_page_pool *pool = ttm_get_pool(flags, cstate);
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struct list_head plist;
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struct page *p = NULL;
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gfp_t gfp_flags = 0;
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unsigned count;
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int r;
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/* No pool for cached pages */
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if (1) {
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for (r = 0; r < npages; ++r) {
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p = alloc_page(gfp_flags);
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if (!p) {
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return -ENOMEM;
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}
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pages[r] = p;
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}
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return 0;
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}
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return 0;
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}
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static void ttm_page_pool_init_locked(struct ttm_page_pool *pool, gfp_t flags,
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char *name)
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{
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spin_lock_init(&pool->lock);
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pool->fill_lock = false;
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INIT_LIST_HEAD(&pool->list);
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pool->npages = pool->nfrees = 0;
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pool->gfp_flags = flags;
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pool->name = name;
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}
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int ttm_page_alloc_init(struct ttm_mem_global *glob, unsigned max_pages)
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{
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int ret;
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WARN_ON(_manager);
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_manager = kzalloc(sizeof(*_manager), GFP_KERNEL);
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_manager->options.max_size = max_pages;
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_manager->options.small = SMALL_ALLOCATION;
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_manager->options.alloc_size = NUM_PAGES_TO_ALLOC;
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return 0;
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}
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void ttm_page_alloc_fini(void)
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{
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int i;
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_manager = NULL;
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}
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int ttm_pool_populate(struct ttm_tt *ttm)
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{
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struct ttm_mem_global *mem_glob = ttm->glob->mem_glob;
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unsigned i;
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int ret;
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if (ttm->state != tt_unpopulated)
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return 0;
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for (i = 0; i < ttm->num_pages; ++i) {
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ret = ttm_get_pages(&ttm->pages[i], 1,
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ttm->page_flags,
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ttm->caching_state);
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if (ret != 0) {
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ttm_pool_unpopulate(ttm);
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return -ENOMEM;
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}
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}
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ttm->state = tt_unbound;
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return 0;
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}
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EXPORT_SYMBOL(ttm_pool_populate);
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void ttm_pool_unpopulate(struct ttm_tt *ttm)
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{
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unsigned i;
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for (i = 0; i < ttm->num_pages; ++i) {
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if (ttm->pages[i]) {
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ttm_put_pages(&ttm->pages[i], 1,
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ttm->page_flags,
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ttm->caching_state);
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}
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}
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ttm->state = tt_unpopulated;
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}
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EXPORT_SYMBOL(ttm_pool_unpopulate);
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