/* * Copyright 2010 Tilera Corporation. All Rights Reserved. * *   This program is free software; you can redistribute it and/or *   modify it under the terms of the GNU General Public License *   as published by the Free Software Foundation, version 2. * *   This program is distributed in the hope that it will be useful, but *   WITHOUT ANY WARRANTY; without even the implied warranty of *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or *   NON INFRINGEMENT.  See the GNU General Public License for *   more details. */ #include <linux/sched.h>#include <linux/kernel.h>#include <linux/mmzone.h>#include <linux/bootmem.h>#include <linux/module.h>#include <linux/node.h>#include <linux/cpu.h>#include <linux/ioport.h>#include <linux/irq.h>#include <linux/kexec.h>#include <linux/pci.h>#include <linux/initrd.h>#include <linux/io.h>#include <linux/highmem.h>#include <linux/smp.h>#include <linux/timex.h>#include <asm/setup.h>#include <asm/sections.h>#include <asm/cacheflush.h>#include <asm/pgalloc.h>#include <asm/mmu_context.h>#include <hv/hypervisor.h>#include <arch/interrupts.h> /* <linux/smp.h> doesn't provide this definition. */#ifndef CONFIG_SMP#define setup_max_cpus 1#endif static inline int ABS(int x) { return x >= 0 ? x : -x; } /* Chip information */char chip_model[64] __write_once; struct pglist_data node_data[MAX_NUMNODES] __read_mostly;EXPORT_SYMBOL(node_data); /* We only create bootmem data on node 0. */static bootmem_data_t __initdata node0_bdata; /* Information on the NUMA nodes that we compute early */unsigned long __cpuinitdata node_start_pfn[MAX_NUMNODES];unsigned long __cpuinitdata node_end_pfn[MAX_NUMNODES];unsigned long __initdata node_memmap_pfn[MAX_NUMNODES];unsigned long __initdata node_percpu_pfn[MAX_NUMNODES];unsigned long __initdata node_free_pfn[MAX_NUMNODES]; static unsigned long __initdata node_percpu[MAX_NUMNODES]; #ifdef CONFIG_HIGHMEM/* Page frame index of end of lowmem on each controller. */unsigned long __cpuinitdata node_lowmem_end_pfn[MAX_NUMNODES]; /* Number of pages that can be mapped into lowmem. */static unsigned long __initdata mappable_physpages;#endif /* Data on which physical memory controller corresponds to which NUMA node */int node_controller[MAX_NUMNODES] = { [0 ... MAX_NUMNODES-1] = -1 }; #ifdef CONFIG_HIGHMEM/* Map information from VAs to PAs */unsigned long pbase_map[1 << (32 - HPAGE_SHIFT)]  __write_once __attribute__((aligned(L2_CACHE_BYTES)));EXPORT_SYMBOL(pbase_map); /* Map information from PAs to VAs */void *vbase_map[NR_PA_HIGHBIT_VALUES]  __write_once __attribute__((aligned(L2_CACHE_BYTES)));EXPORT_SYMBOL(vbase_map);#endif /* Node number as a function of the high PA bits */int highbits_to_node[NR_PA_HIGHBIT_VALUES] __write_once;EXPORT_SYMBOL(highbits_to_node); static unsigned int __initdata maxmem_pfn = -1U;static unsigned int __initdata maxnodemem_pfn[MAX_NUMNODES] = {	[0 ... MAX_NUMNODES-1] = -1U};static nodemask_t __initdata isolnodes; #ifdef CONFIG_PCIenum { DEFAULT_PCI_RESERVE_MB = 64 };static unsigned int __initdata pci_reserve_mb = DEFAULT_PCI_RESERVE_MB;unsigned long __initdata pci_reserve_start_pfn = -1U;unsigned long __initdata pci_reserve_end_pfn = -1U;#endif static int __init setup_maxmem(char *str){	long maxmem_mb;	if (str == NULL || strict_strtol(str, 0, &maxmem_mb) != 0 ||	    maxmem_mb == 0)		return -EINVAL; 	maxmem_pfn = (maxmem_mb >> (HPAGE_SHIFT - 20)) <<		(HPAGE_SHIFT - PAGE_SHIFT);	pr_info("Forcing RAM used to no more than %dMB\n",	       maxmem_pfn >> (20 - PAGE_SHIFT));	return 0;}early_param("maxmem", setup_maxmem); static int __init setup_maxnodemem(char *str){	char *endp;	long maxnodemem_mb, node; 	node = str ? simple_strtoul(str, &endp, 0) : INT_MAX;	if (node >= MAX_NUMNODES || *endp != ':' ||	    strict_strtol(endp+1, 0, &maxnodemem_mb) != 0)		return -EINVAL; 	maxnodemem_pfn[node] = (maxnodemem_mb >> (HPAGE_SHIFT - 20)) <<		(HPAGE_SHIFT - PAGE_SHIFT);	pr_info("Forcing RAM used on node %ld to no more than %dMB\n",	       node, maxnodemem_pfn[node] >> (20 - PAGE_SHIFT));	return 0;}early_param("maxnodemem", setup_maxnodemem); static int __init setup_isolnodes(char *str){	char buf[MAX_NUMNODES * 5];	if (str == NULL || nodelist_parse(str, isolnodes) != 0)		return -EINVAL; 	nodelist_scnprintf(buf, sizeof(buf), isolnodes);	pr_info("Set isolnodes value to '%s'\n", buf);	return 0;}early_param("isolnodes", setup_isolnodes); #ifdef CONFIG_PCIstatic int __init setup_pci_reserve(char* str){	unsigned long mb; 	if (str == NULL || strict_strtoul(str, 0, &mb) != 0 ||	    mb > 3 * 1024)		return -EINVAL; 	pci_reserve_mb = mb;	pr_info("Reserving %dMB for PCIE root complex mappings\n",	       pci_reserve_mb);	return 0;}early_param("pci_reserve", setup_pci_reserve);#endif #ifndef __tilegx__/* * vmalloc=size forces the vmalloc area to be exactly 'size' bytes. * This can be used to increase (or decrease) the vmalloc area. */static int __init parse_vmalloc(char *arg){	if (!arg)		return -EINVAL; 	VMALLOC_RESERVE = (memparse(arg, &arg) + PGDIR_SIZE - 1) & PGDIR_MASK; 	/* See validate_va() for more on this test. */	if ((long)_VMALLOC_START >= 0)		early_panic("\"vmalloc=%#lx\" value too large: maximum %#lx\n",			    VMALLOC_RESERVE, _VMALLOC_END - 0x80000000UL); 	return 0;}early_param("vmalloc", parse_vmalloc);#endif #ifdef CONFIG_HIGHMEM/* * Determine for each controller where its lowmem is mapped and how much of * it is mapped there.  On controller zero, the first few megabytes are * already mapped in as code at MEM_SV_INTRPT, so in principle we could * start our data mappings higher up, but for now we don't bother, to avoid * additional confusion. * * One question is whether, on systems with more than 768 Mb and * controllers of different sizes, to map in a proportionate amount of * each one, or to try to map the same amount from each controller. * (E.g. if we have three controllers with 256MB, 1GB, and 256MB * respectively, do we map 256MB from each, or do we map 128 MB, 512 * MB, and 128 MB respectively?)  For now we use a proportionate * solution like the latter. * * The VA/PA mapping demands that we align our decisions at 16 MB * boundaries so that we can rapidly convert VA to PA. */static void *__init setup_pa_va_mapping(void){	unsigned long curr_pages = 0;	unsigned long vaddr = PAGE_OFFSET;	nodemask_t highonlynodes = isolnodes;	int i, j; 	memset(pbase_map, -1, sizeof(pbase_map));	memset(vbase_map, -1, sizeof(vbase_map)); 	/* Node zero cannot be isolated for LOWMEM purposes. */	node_clear(0, highonlynodes); 	/* Count up the number of pages on non-highonlynodes controllers. */	mappable_physpages = 0;	for_each_online_node(i) {		if (!node_isset(i, highonlynodes))			mappable_physpages +=				node_end_pfn[i] - node_start_pfn[i];	} 	for_each_online_node(i) {		unsigned long start = node_start_pfn[i];		unsigned long end = node_end_pfn[i];		unsigned long size = end - start;		unsigned long vaddr_end; 		if (node_isset(i, highonlynodes)) {			/* Mark this controller as having no lowmem. */			node_lowmem_end_pfn[i] = start;			continue;		} 		curr_pages += size;		if (mappable_physpages > MAXMEM_PFN) {			vaddr_end = PAGE_OFFSET +				(((u64)curr_pages * MAXMEM_PFN /				  mappable_physpages)				 << PAGE_SHIFT);		} else {			vaddr_end = PAGE_OFFSET + (curr_pages << PAGE_SHIFT);		}		for (j = 0; vaddr < vaddr_end; vaddr += HPAGE_SIZE, ++j) {			unsigned long this_pfn =				start + (j << HUGETLB_PAGE_ORDER);			pbase_map[vaddr >> HPAGE_SHIFT] = this_pfn;			if (vbase_map[__pfn_to_highbits(this_pfn)] ==			    (void *)-1)				vbase_map[__pfn_to_highbits(this_pfn)] =					(void *)(vaddr & HPAGE_MASK);		}		node_lowmem_end_pfn[i] = start + (j << HUGETLB_PAGE_ORDER);		BUG_ON(node_lowmem_end_pfn[i] > end);	} 	/* Return highest address of any mapped memory. */	return (void *)vaddr;}#endif /* CONFIG_HIGHMEM */ /* * Register our most important memory mappings with the debug stub. * * This is up to 4 mappings for lowmem, one mapping per memory * controller, plus one for our text segment. */static void __cpuinit store_permanent_mappings(void){	int i; 	for_each_online_node(i) {		HV_PhysAddr pa = ((HV_PhysAddr)node_start_pfn[i]) << PAGE_SHIFT;#ifdef CONFIG_HIGHMEM		HV_PhysAddr high_mapped_pa = node_lowmem_end_pfn[i];#else		HV_PhysAddr high_mapped_pa = node_end_pfn[i];#endif 		unsigned long pages = high_mapped_pa - node_start_pfn[i];		HV_VirtAddr addr = (HV_VirtAddr) __va(pa);		hv_store_mapping(addr, pages << PAGE_SHIFT, pa);	} 	hv_store_mapping((HV_VirtAddr)_stext,			 (uint32_t)(_einittext - _stext), 0);} /* * Use hv_inquire_physical() to populate node_{start,end}_pfn[] * and node_online_map, doing suitable sanity-checking. * Also set min_low_pfn, max_low_pfn, and max_pfn. */static void __init setup_memory(void){	int i, j;	int highbits_seen[NR_PA_HIGHBIT_VALUES] = { 0 };#ifdef CONFIG_HIGHMEM	long highmem_pages;#endif#ifndef __tilegx__	int cap;#endif#if defined(CONFIG_HIGHMEM) || defined(__tilegx__)	long lowmem_pages;#endif 	/* We are using a char to hold the cpu_2_node[] mapping */	BUILD_BUG_ON(MAX_NUMNODES > 127); 	/* Discover the ranges of memory available to us */	for (i = 0; ; ++i) {		unsigned long start, size, end, highbits;		HV_PhysAddrRange range = hv_inquire_physical(i);		if (range.size == 0)			break;#ifdef CONFIG_FLATMEM		if (i > 0) {			pr_err("Can't use discontiguous PAs: %#llx..%#llx\n",			       range.size, range.start + range.size);			continue;		}#endif#ifndef __tilegx__		if ((unsigned long)range.start) {			pr_err("Range not at 4GB multiple: %#llx..%#llx\n",			       range.start, range.start + range.size);			continue;		}#endif		if ((range.start & (HPAGE_SIZE-1)) != 0 ||		    (range.size & (HPAGE_SIZE-1)) != 0) {			unsigned long long start_pa = range.start;			unsigned long long orig_size = range.size;			range.start = (start_pa + HPAGE_SIZE - 1) & HPAGE_MASK;			range.size -= (range.start - start_pa);			range.size &= HPAGE_MASK;			pr_err("Range not hugepage-aligned: %#llx..%#llx:"			       " now %#llx-%#llx\n",			       start_pa, start_pa + orig_size,			       range.start, range.start + range.size);		}		highbits = __pa_to_highbits(range.start);		if (highbits >= NR_PA_HIGHBIT_VALUES) {			pr_err("PA high bits too high: %#llx..%#llx\n",			       range.start, range.start + range.size);			continue;		}		if (highbits_seen[highbits]) {			pr_err("Range overlaps in high bits: %#llx..%#llx\n",			       range.start, range.start + range.size);			continue;		}		highbits_seen[highbits] = 1;		if (PFN_DOWN(range.size) > maxnodemem_pfn[i]) {			int max_size = maxnodemem_pfn[i];			if (max_size > 0) {				pr_err("Maxnodemem reduced node %d to"				       " %d pages\n", i, max_size);				range.size = PFN_PHYS(max_size);			} else {				pr_err("Maxnodemem disabled node %d\n", i);				continue;			}		}		if (num_physpages + PFN_DOWN(range.size) > maxmem_pfn) {			int max_size = maxmem_pfn - num_physpages;			if (max_size > 0) {				pr_err("Maxmem reduced node %d to %d pages\n",				       i, max_size);				range.size = PFN_PHYS(max_size);			} else {				pr_err("Maxmem disabled node %d\n", i);				continue;			}		}		if (i >= MAX_NUMNODES) {			pr_err("Too many PA nodes (#%d): %#llx...%#llx\n",			       i, range.size, range.size + range.start);			continue;		} 		start = range.start >> PAGE_SHIFT;		size = range.size >> PAGE_SHIFT;		end = start + size; #ifndef __tilegx__		if (((HV_PhysAddr)end << PAGE_SHIFT) !=		    (range.start + range.size)) {			pr_err("PAs too high to represent: %#llx..%#llx\n",			       range.start, range.start + range.size);			continue;		}#endif#ifdef CONFIG_PCI		/*		 * Blocks that overlap the pci reserved region must		 * have enough space to hold the maximum percpu data		 * region at the top of the range.  If there isn't		 * enough space above the reserved region, just		 * truncate the node.		 */		if (start <= pci_reserve_start_pfn &&		    end > pci_reserve_start_pfn) {			unsigned int per_cpu_size =				__per_cpu_end - __per_cpu_start;			unsigned int percpu_pages =				NR_CPUS * (PFN_UP(per_cpu_size) >> PAGE_SHIFT);			if (end < pci_reserve_end_pfn + percpu_pages) {				end = pci_reserve_start_pfn;				pr_err("PCI mapping region reduced node %d to"				       " %ld pages\n", i, end - start);			}		}#endif 		for (j = __pfn_to_highbits(start);		     j <= __pfn_to_highbits(end - 1); j++)			highbits_to_node[j] = i; 		node_start_pfn[i] = start;		node_end_pfn[i] = end;		node_controller[i] = range.controller;		num_physpages += size;		max_pfn = end; 		/* Mark node as online */		node_set(i, node_online_map);		node_set(i, node_possible_map);	} #ifndef __tilegx__	/*	 * For 4KB pages, mem_map "struct page" data is 1% of the size	 * of the physical memory, so can be quite big (640 MB for	 * four 16G zones).  These structures must be mapped in	 * lowmem, and since we currently cap out at about 768 MB,	 * it's impractical to try to use this much address space.	 * For now, arbitrarily cap the amount of physical memory	 * we're willing to use at 8 million pages (32GB of 4KB pages).	 */	cap = 8 * 1024 * 1024;  /* 8 million pages */	if (num_physpages > cap) {		int num_nodes = num_online_nodes();		int cap_each = cap / num_nodes;		unsigned long dropped_pages = 0;		for (i = 0; i < num_nodes; ++i) {			int size = node_end_pfn[i] - node_start_pfn[i];			if (size > cap_each) {				dropped_pages += (size - cap_each);				node_end_pfn[i] = node_start_pfn[i] + cap_each;			}		}		num_physpages -= dropped_pages;		pr_warning("Only using %ldMB memory;"		       " ignoring %ldMB.\n",		       num_physpages >> (20 - PAGE_SHIFT),		       dropped_pages >> (20 - PAGE_SHIFT));		pr_warning("Consider using a larger page size.\n");	}#endif 	/* Heap starts just above the last loaded address. */	min_low_pfn = PFN_UP((unsigned long)_end - PAGE_OFFSET); #ifdef CONFIG_HIGHMEM	/* Find where we map lowmem from each controller. */	high_memory = setup_pa_va_mapping(); 	/* Set max_low_pfn based on what node 0 can directly address. */	max_low_pfn = node_lowmem_end_pfn[0]; 	lowmem_pages = (mappable_physpages > MAXMEM_PFN) ?		MAXMEM_PFN : mappable_physpages;	highmem_pages = (long) (num_physpages - lowmem_pages); 	pr_notice("%ldMB HIGHMEM available.\n",	       pages_to_mb(highmem_pages > 0 ? highmem_pages : 0));	pr_notice("%ldMB LOWMEM available.\n",			pages_to_mb(lowmem_pages));#else	/* Set max_low_pfn based on what node 0 can directly address. */	max_low_pfn = node_end_pfn[0]; #ifndef __tilegx__	if (node_end_pfn[0] > MAXMEM_PFN) {		pr_warning("Only using %ldMB LOWMEM.\n",		       MAXMEM>>20);		pr_warning("Use a HIGHMEM enabled kernel.\n");		max_low_pfn = MAXMEM_PFN;		max_pfn = MAXMEM_PFN;		num_physpages = MAXMEM_PFN;		node_end_pfn[0] = MAXMEM_PFN;	} else {		pr_notice("%ldMB memory available.\n",

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