summaryrefslogtreecommitdiffstats
path: root/arch/ia64/kernel/uncached.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/ia64/kernel/uncached.c')
-rw-r--r--arch/ia64/kernel/uncached.c273
1 files changed, 0 insertions, 273 deletions
diff --git a/arch/ia64/kernel/uncached.c b/arch/ia64/kernel/uncached.c
deleted file mode 100644
index a0fec82c56..0000000000
--- a/arch/ia64/kernel/uncached.c
+++ /dev/null
@@ -1,273 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (C) 2001-2008 Silicon Graphics, Inc. All rights reserved.
- *
- * A simple uncached page allocator using the generic allocator. This
- * allocator first utilizes the spare (spill) pages found in the EFI
- * memmap and will then start converting cached pages to uncached ones
- * at a granule at a time. Node awareness is implemented by having a
- * pool of pages per node.
- */
-
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/errno.h>
-#include <linux/string.h>
-#include <linux/efi.h>
-#include <linux/nmi.h>
-#include <linux/genalloc.h>
-#include <linux/gfp.h>
-#include <linux/pgtable.h>
-#include <asm/efi.h>
-#include <asm/page.h>
-#include <asm/pal.h>
-#include <linux/atomic.h>
-#include <asm/tlbflush.h>
-
-struct uncached_pool {
- struct gen_pool *pool;
- struct mutex add_chunk_mutex; /* serialize adding a converted chunk */
- int nchunks_added; /* #of converted chunks added to pool */
- atomic_t status; /* smp called function's return status*/
-};
-
-#define MAX_CONVERTED_CHUNKS_PER_NODE 2
-
-struct uncached_pool uncached_pools[MAX_NUMNODES];
-
-
-static void uncached_ipi_visibility(void *data)
-{
- int status;
- struct uncached_pool *uc_pool = (struct uncached_pool *)data;
-
- status = ia64_pal_prefetch_visibility(PAL_VISIBILITY_PHYSICAL);
- if ((status != PAL_VISIBILITY_OK) &&
- (status != PAL_VISIBILITY_OK_REMOTE_NEEDED))
- atomic_inc(&uc_pool->status);
-}
-
-
-static void uncached_ipi_mc_drain(void *data)
-{
- int status;
- struct uncached_pool *uc_pool = (struct uncached_pool *)data;
-
- status = ia64_pal_mc_drain();
- if (status != PAL_STATUS_SUCCESS)
- atomic_inc(&uc_pool->status);
-}
-
-
-/*
- * Add a new chunk of uncached memory pages to the specified pool.
- *
- * @pool: pool to add new chunk of uncached memory to
- * @nid: node id of node to allocate memory from, or -1
- *
- * This is accomplished by first allocating a granule of cached memory pages
- * and then converting them to uncached memory pages.
- */
-static int uncached_add_chunk(struct uncached_pool *uc_pool, int nid)
-{
- struct page *page;
- int status, i, nchunks_added = uc_pool->nchunks_added;
- unsigned long c_addr, uc_addr;
-
- if (mutex_lock_interruptible(&uc_pool->add_chunk_mutex) != 0)
- return -1; /* interrupted by a signal */
-
- if (uc_pool->nchunks_added > nchunks_added) {
- /* someone added a new chunk while we were waiting */
- mutex_unlock(&uc_pool->add_chunk_mutex);
- return 0;
- }
-
- if (uc_pool->nchunks_added >= MAX_CONVERTED_CHUNKS_PER_NODE) {
- mutex_unlock(&uc_pool->add_chunk_mutex);
- return -1;
- }
-
- /* attempt to allocate a granule's worth of cached memory pages */
-
- page = __alloc_pages_node(nid,
- GFP_KERNEL | __GFP_ZERO | __GFP_THISNODE,
- IA64_GRANULE_SHIFT-PAGE_SHIFT);
- if (!page) {
- mutex_unlock(&uc_pool->add_chunk_mutex);
- return -1;
- }
-
- /* convert the memory pages from cached to uncached */
-
- c_addr = (unsigned long)page_address(page);
- uc_addr = c_addr - PAGE_OFFSET + __IA64_UNCACHED_OFFSET;
-
- /*
- * There's a small race here where it's possible for someone to
- * access the page through /dev/mem halfway through the conversion
- * to uncached - not sure it's really worth bothering about
- */
- for (i = 0; i < (IA64_GRANULE_SIZE / PAGE_SIZE); i++)
- SetPageUncached(&page[i]);
-
- flush_tlb_kernel_range(uc_addr, uc_addr + IA64_GRANULE_SIZE);
-
- status = ia64_pal_prefetch_visibility(PAL_VISIBILITY_PHYSICAL);
- if (status == PAL_VISIBILITY_OK_REMOTE_NEEDED) {
- atomic_set(&uc_pool->status, 0);
- smp_call_function(uncached_ipi_visibility, uc_pool, 1);
- if (atomic_read(&uc_pool->status))
- goto failed;
- } else if (status != PAL_VISIBILITY_OK)
- goto failed;
-
- preempt_disable();
-
- flush_icache_range(uc_addr, uc_addr + IA64_GRANULE_SIZE);
-
- /* flush the just introduced uncached translation from the TLB */
- local_flush_tlb_all();
-
- preempt_enable();
-
- status = ia64_pal_mc_drain();
- if (status != PAL_STATUS_SUCCESS)
- goto failed;
- atomic_set(&uc_pool->status, 0);
- smp_call_function(uncached_ipi_mc_drain, uc_pool, 1);
- if (atomic_read(&uc_pool->status))
- goto failed;
-
- /*
- * The chunk of memory pages has been converted to uncached so now we
- * can add it to the pool.
- */
- status = gen_pool_add(uc_pool->pool, uc_addr, IA64_GRANULE_SIZE, nid);
- if (status)
- goto failed;
-
- uc_pool->nchunks_added++;
- mutex_unlock(&uc_pool->add_chunk_mutex);
- return 0;
-
- /* failed to convert or add the chunk so give it back to the kernel */
-failed:
- for (i = 0; i < (IA64_GRANULE_SIZE / PAGE_SIZE); i++)
- ClearPageUncached(&page[i]);
-
- free_pages(c_addr, IA64_GRANULE_SHIFT-PAGE_SHIFT);
- mutex_unlock(&uc_pool->add_chunk_mutex);
- return -1;
-}
-
-
-/*
- * uncached_alloc_page
- *
- * @starting_nid: node id of node to start with, or -1
- * @n_pages: number of contiguous pages to allocate
- *
- * Allocate the specified number of contiguous uncached pages on the
- * requested node. If not enough contiguous uncached pages are available
- * on the requested node, roundrobin starting with the next higher node.
- */
-unsigned long uncached_alloc_page(int starting_nid, int n_pages)
-{
- unsigned long uc_addr;
- struct uncached_pool *uc_pool;
- int nid;
-
- if (unlikely(starting_nid >= MAX_NUMNODES))
- return 0;
-
- if (starting_nid < 0)
- starting_nid = numa_node_id();
- nid = starting_nid;
-
- do {
- if (!node_state(nid, N_HIGH_MEMORY))
- continue;
- uc_pool = &uncached_pools[nid];
- if (uc_pool->pool == NULL)
- continue;
- do {
- uc_addr = gen_pool_alloc(uc_pool->pool,
- n_pages * PAGE_SIZE);
- if (uc_addr != 0)
- return uc_addr;
- } while (uncached_add_chunk(uc_pool, nid) == 0);
-
- } while ((nid = (nid + 1) % MAX_NUMNODES) != starting_nid);
-
- return 0;
-}
-EXPORT_SYMBOL(uncached_alloc_page);
-
-
-/*
- * uncached_free_page
- *
- * @uc_addr: uncached address of first page to free
- * @n_pages: number of contiguous pages to free
- *
- * Free the specified number of uncached pages.
- */
-void uncached_free_page(unsigned long uc_addr, int n_pages)
-{
- int nid = paddr_to_nid(uc_addr - __IA64_UNCACHED_OFFSET);
- struct gen_pool *pool = uncached_pools[nid].pool;
-
- if (unlikely(pool == NULL))
- return;
-
- if ((uc_addr & (0XFUL << 60)) != __IA64_UNCACHED_OFFSET)
- panic("uncached_free_page invalid address %lx\n", uc_addr);
-
- gen_pool_free(pool, uc_addr, n_pages * PAGE_SIZE);
-}
-EXPORT_SYMBOL(uncached_free_page);
-
-
-/*
- * uncached_build_memmap,
- *
- * @uc_start: uncached starting address of a chunk of uncached memory
- * @uc_end: uncached ending address of a chunk of uncached memory
- * @arg: ignored, (NULL argument passed in on call to efi_memmap_walk_uc())
- *
- * Called at boot time to build a map of pages that can be used for
- * memory special operations.
- */
-static int __init uncached_build_memmap(u64 uc_start, u64 uc_end, void *arg)
-{
- int nid = paddr_to_nid(uc_start - __IA64_UNCACHED_OFFSET);
- struct gen_pool *pool = uncached_pools[nid].pool;
- size_t size = uc_end - uc_start;
-
- touch_softlockup_watchdog();
-
- if (pool != NULL) {
- memset((char *)uc_start, 0, size);
- (void) gen_pool_add(pool, uc_start, size, nid);
- }
- return 0;
-}
-
-
-static int __init uncached_init(void)
-{
- int nid;
-
- for_each_online_node(nid) {
- uncached_pools[nid].pool = gen_pool_create(PAGE_SHIFT, nid);
- mutex_init(&uncached_pools[nid].add_chunk_mutex);
- }
-
- efi_memmap_walk_uc(uncached_build_memmap, NULL);
- return 0;
-}
-
-__initcall(uncached_init);