diff options
Diffstat (limited to 'arch/ia64')
| -rw-r--r-- | arch/ia64/Kconfig | 4 | ||||
| -rw-r--r-- | arch/ia64/kernel/Makefile | 1 | ||||
| -rw-r--r-- | arch/ia64/kernel/efi.c | 32 | ||||
| -rw-r--r-- | arch/ia64/kernel/uncached.c | 246 |
4 files changed, 283 insertions, 0 deletions
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig index 3ad2c4af099..295b5abee72 100644 --- a/arch/ia64/Kconfig +++ b/arch/ia64/Kconfig @@ -50,6 +50,10 @@ config SCHED_NO_NO_OMIT_FRAME_POINTER bool default y +config IA64_UNCACHED_ALLOCATOR + bool + select GENERIC_ALLOCATOR + choice prompt "System type" default IA64_GENERIC diff --git a/arch/ia64/kernel/Makefile b/arch/ia64/kernel/Makefile index c1a02bbc252..4c73d8ba2e3 100644 --- a/arch/ia64/kernel/Makefile +++ b/arch/ia64/kernel/Makefile @@ -20,6 +20,7 @@ obj-$(CONFIG_SMP) += smp.o smpboot.o domain.o obj-$(CONFIG_PERFMON) += perfmon_default_smpl.o obj-$(CONFIG_IA64_CYCLONE) += cyclone.o obj-$(CONFIG_IA64_MCA_RECOVERY) += mca_recovery.o +obj-$(CONFIG_IA64_UNCACHED_ALLOCATOR) += uncached.o mca_recovery-y += mca_drv.o mca_drv_asm.o # The gate DSO image is built using a special linker script. diff --git a/arch/ia64/kernel/efi.c b/arch/ia64/kernel/efi.c index 4a3b1aac43e..179f230816e 100644 --- a/arch/ia64/kernel/efi.c +++ b/arch/ia64/kernel/efi.c @@ -410,6 +410,38 @@ efi_memmap_walk (efi_freemem_callback_t callback, void *arg) } /* + * Walk the EFI memory map to pull out leftover pages in the lower + * memory regions which do not end up in the regular memory map and + * stick them into the uncached allocator + * + * The regular walk function is significantly more complex than the + * uncached walk which means it really doesn't make sense to try and + * marge the two. + */ +void __init +efi_memmap_walk_uc (efi_freemem_callback_t callback) +{ + void *efi_map_start, *efi_map_end, *p; + efi_memory_desc_t *md; + u64 efi_desc_size, start, end; + + efi_map_start = __va(ia64_boot_param->efi_memmap); + efi_map_end = efi_map_start + ia64_boot_param->efi_memmap_size; + efi_desc_size = ia64_boot_param->efi_memdesc_size; + + for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) { + md = p; + if (md->attribute == EFI_MEMORY_UC) { + start = PAGE_ALIGN(md->phys_addr); + end = PAGE_ALIGN((md->phys_addr+(md->num_pages << EFI_PAGE_SHIFT)) & PAGE_MASK); + if ((*callback)(start, end, NULL) < 0) + return; + } + } +} + + +/* * Look for the PAL_CODE region reported by EFI and maps it using an * ITR to enable safe PAL calls in virtual mode. See IA-64 Processor * Abstraction Layer chapter 11 in ADAG diff --git a/arch/ia64/kernel/uncached.c b/arch/ia64/kernel/uncached.c new file mode 100644 index 00000000000..490dfc9ab47 --- /dev/null +++ b/arch/ia64/kernel/uncached.c @@ -0,0 +1,246 @@ +/* + * Copyright (C) 2001-2005 Silicon Graphics, Inc. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of version 2 of the GNU General Public License + * as published by the Free Software Foundation. + * + * 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/slab.h> +#include <linux/efi.h> +#include <linux/genalloc.h> +#include <asm/page.h> +#include <asm/pal.h> +#include <asm/system.h> +#include <asm/pgtable.h> +#include <asm/atomic.h> +#include <asm/tlbflush.h> +#include <asm/sn/arch.h> + +#define DEBUG 0 + +#if DEBUG +#define dprintk printk +#else +#define dprintk(x...) do { } while (0) +#endif + +void __init efi_memmap_walk_uc (efi_freemem_callback_t callback); + +#define MAX_UNCACHED_GRANULES 5 +static int allocated_granules; + +struct gen_pool *uncached_pool[MAX_NUMNODES]; + + +static void uncached_ipi_visibility(void *data) +{ + int status; + + status = ia64_pal_prefetch_visibility(PAL_VISIBILITY_PHYSICAL); + if ((status != PAL_VISIBILITY_OK) && + (status != PAL_VISIBILITY_OK_REMOTE_NEEDED)) + printk(KERN_DEBUG "pal_prefetch_visibility() returns %i on " + "CPU %i\n", status, get_cpu()); +} + + +static void uncached_ipi_mc_drain(void *data) +{ + int status; + status = ia64_pal_mc_drain(); + if (status) + printk(KERN_WARNING "ia64_pal_mc_drain() failed with %i on " + "CPU %i\n", status, get_cpu()); +} + + +static unsigned long +uncached_get_new_chunk(struct gen_pool *poolp) +{ + struct page *page; + void *tmp; + int status, i; + unsigned long addr, node; + + if (allocated_granules >= MAX_UNCACHED_GRANULES) + return 0; + + node = poolp->private; + page = alloc_pages_node(node, GFP_KERNEL | __GFP_ZERO, + IA64_GRANULE_SHIFT-PAGE_SHIFT); + + dprintk(KERN_INFO "get_new_chunk page %p, addr %lx\n", + page, (unsigned long)(page-vmem_map) << PAGE_SHIFT); + + /* + * Do magic if no mem on local node! XXX + */ + if (!page) + return 0; + tmp = page_address(page); + + /* + * 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(tmp, tmp + IA64_GRANULE_SIZE); + + status = ia64_pal_prefetch_visibility(PAL_VISIBILITY_PHYSICAL); + + dprintk(KERN_INFO "pal_prefetch_visibility() returns %i on cpu %i\n", + status, get_cpu()); + + if (!status) { + status = smp_call_function(uncached_ipi_visibility, NULL, 0, 1); + if (status) + printk(KERN_WARNING "smp_call_function failed for " + "uncached_ipi_visibility! (%i)\n", status); + } + + if (ia64_platform_is("sn2")) + sn_flush_all_caches((unsigned long)tmp, IA64_GRANULE_SIZE); + else + flush_icache_range((unsigned long)tmp, + (unsigned long)tmp+IA64_GRANULE_SIZE); + + ia64_pal_mc_drain(); + status = smp_call_function(uncached_ipi_mc_drain, NULL, 0, 1); + if (status) + printk(KERN_WARNING "smp_call_function failed for " + "uncached_ipi_mc_drain! (%i)\n", status); + + addr = (unsigned long)tmp - PAGE_OFFSET + __IA64_UNCACHED_OFFSET; + + allocated_granules++; + return addr; +} + + +/* + * uncached_alloc_page + * + * Allocate 1 uncached page. Allocates on the requested node. If no + * uncached pages are available on the requested node, roundrobin starting + * with higher nodes. + */ +unsigned long +uncached_alloc_page(int nid) +{ + unsigned long maddr; + + maddr = gen_pool_alloc(uncached_pool[nid], PAGE_SIZE); + + dprintk(KERN_DEBUG "uncached_alloc_page returns %lx on node %i\n", + maddr, nid); + + /* + * If no memory is availble on our local node, try the + * remaining nodes in the system. + */ + if (!maddr) { + int i; + + for (i = MAX_NUMNODES - 1; i >= 0; i--) { + if (i == nid || !node_online(i)) + continue; + maddr = gen_pool_alloc(uncached_pool[i], PAGE_SIZE); + dprintk(KERN_DEBUG "uncached_alloc_page alternate search " + "returns %lx on node %i\n", maddr, i); + if (maddr) { + break; + } + } + } + + return maddr; +} +EXPORT_SYMBOL(uncached_alloc_page); + + +/* + * uncached_free_page + * + * Free a single uncached page. + */ +void +uncached_free_page(unsigned long maddr) +{ + int node; + + node = nasid_to_cnodeid(NASID_GET(maddr)); + + dprintk(KERN_DEBUG "uncached_free_page(%lx) on node %i\n", maddr, node); + + if ((maddr & (0XFUL << 60)) != __IA64_UNCACHED_OFFSET) + panic("uncached_free_page invalid address %lx\n", maddr); + + gen_pool_free(uncached_pool[node], maddr, PAGE_SIZE); +} +EXPORT_SYMBOL(uncached_free_page); + + +/* + * uncached_build_memmap, + * + * Called at boot time to build a map of pages that can be used for + * memory special operations. + */ +static int __init +uncached_build_memmap(unsigned long start, unsigned long end, void *arg) +{ + long length; + unsigned long vstart, vend; + int node; + + length = end - start; + vstart = start + __IA64_UNCACHED_OFFSET; + vend = end + __IA64_UNCACHED_OFFSET; + + dprintk(KERN_ERR "uncached_build_memmap(%lx %lx)\n", start, end); + + memset((char *)vstart, 0, length); + + node = nasid_to_cnodeid(NASID_GET(start)); + + for (; vstart < vend ; vstart += PAGE_SIZE) { + dprintk(KERN_INFO "sticking %lx into the pool!\n", vstart); + gen_pool_free(uncached_pool[node], vstart, PAGE_SIZE); + } + + return 0; +} + + +static int __init uncached_init(void) { + int i; + + for (i = 0; i < MAX_NUMNODES; i++) { + if (!node_online(i)) + continue; + uncached_pool[i] = gen_pool_create(0, IA64_GRANULE_SHIFT, + &uncached_get_new_chunk, i); + } + + efi_memmap_walk_uc(uncached_build_memmap); + + return 0; +} + +__initcall(uncached_init); |