cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ip27-memory.c (10033B)


      1/*
      2 * This file is subject to the terms and conditions of the GNU General Public
      3 * License.  See the file "COPYING" in the main directory of this archive
      4 * for more details.
      5 *
      6 * Copyright (C) 2000, 05 by Ralf Baechle (ralf@linux-mips.org)
      7 * Copyright (C) 2000 by Silicon Graphics, Inc.
      8 * Copyright (C) 2004 by Christoph Hellwig
      9 *
     10 * On SGI IP27 the ARC memory configuration data is completely bogus but
     11 * alternate easier to use mechanisms are available.
     12 */
     13#include <linux/init.h>
     14#include <linux/kernel.h>
     15#include <linux/memblock.h>
     16#include <linux/mm.h>
     17#include <linux/mmzone.h>
     18#include <linux/export.h>
     19#include <linux/nodemask.h>
     20#include <linux/swap.h>
     21#include <linux/pfn.h>
     22#include <linux/highmem.h>
     23#include <asm/page.h>
     24#include <asm/pgalloc.h>
     25#include <asm/sections.h>
     26
     27#include <asm/sn/arch.h>
     28#include <asm/sn/agent.h>
     29#include <asm/sn/klconfig.h>
     30
     31#include "ip27-common.h"
     32
     33#define SLOT_PFNSHIFT		(SLOT_SHIFT - PAGE_SHIFT)
     34#define PFN_NASIDSHFT		(NASID_SHFT - PAGE_SHIFT)
     35
     36struct node_data *__node_data[MAX_NUMNODES];
     37
     38EXPORT_SYMBOL(__node_data);
     39
     40static u64 gen_region_mask(void)
     41{
     42	int region_shift;
     43	u64 region_mask;
     44	nasid_t nasid;
     45
     46	region_shift = get_region_shift();
     47	region_mask = 0;
     48	for_each_online_node(nasid)
     49		region_mask |= BIT_ULL(nasid >> region_shift);
     50
     51	return region_mask;
     52}
     53
     54#define rou_rflag	rou_flags
     55
     56static int router_distance;
     57
     58static void router_recurse(klrou_t *router_a, klrou_t *router_b, int depth)
     59{
     60	klrou_t *router;
     61	lboard_t *brd;
     62	int	port;
     63
     64	if (router_a->rou_rflag == 1)
     65		return;
     66
     67	if (depth >= router_distance)
     68		return;
     69
     70	router_a->rou_rflag = 1;
     71
     72	for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
     73		if (router_a->rou_port[port].port_nasid == INVALID_NASID)
     74			continue;
     75
     76		brd = (lboard_t *)NODE_OFFSET_TO_K0(
     77			router_a->rou_port[port].port_nasid,
     78			router_a->rou_port[port].port_offset);
     79
     80		if (brd->brd_type == KLTYPE_ROUTER) {
     81			router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
     82			if (router == router_b) {
     83				if (depth < router_distance)
     84					router_distance = depth;
     85			}
     86			else
     87				router_recurse(router, router_b, depth + 1);
     88		}
     89	}
     90
     91	router_a->rou_rflag = 0;
     92}
     93
     94unsigned char __node_distances[MAX_NUMNODES][MAX_NUMNODES];
     95EXPORT_SYMBOL(__node_distances);
     96
     97static int __init compute_node_distance(nasid_t nasid_a, nasid_t nasid_b)
     98{
     99	klrou_t *router, *router_a = NULL, *router_b = NULL;
    100	lboard_t *brd, *dest_brd;
    101	nasid_t nasid;
    102	int port;
    103
    104	/* Figure out which routers nodes in question are connected to */
    105	for_each_online_node(nasid) {
    106		brd = find_lboard_class((lboard_t *)KL_CONFIG_INFO(nasid),
    107					KLTYPE_ROUTER);
    108
    109		if (!brd)
    110			continue;
    111
    112		do {
    113			if (brd->brd_flags & DUPLICATE_BOARD)
    114				continue;
    115
    116			router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
    117			router->rou_rflag = 0;
    118
    119			for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
    120				if (router->rou_port[port].port_nasid == INVALID_NASID)
    121					continue;
    122
    123				dest_brd = (lboard_t *)NODE_OFFSET_TO_K0(
    124					router->rou_port[port].port_nasid,
    125					router->rou_port[port].port_offset);
    126
    127				if (dest_brd->brd_type == KLTYPE_IP27) {
    128					if (dest_brd->brd_nasid == nasid_a)
    129						router_a = router;
    130					if (dest_brd->brd_nasid == nasid_b)
    131						router_b = router;
    132				}
    133			}
    134
    135		} while ((brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)));
    136	}
    137
    138	if (nasid_a == nasid_b)
    139		return LOCAL_DISTANCE;
    140
    141	if (router_a == router_b)
    142		return LOCAL_DISTANCE + 1;
    143
    144	if (router_a == NULL) {
    145		pr_info("node_distance: router_a NULL\n");
    146		return 255;
    147	}
    148	if (router_b == NULL) {
    149		pr_info("node_distance: router_b NULL\n");
    150		return 255;
    151	}
    152
    153	router_distance = 100;
    154	router_recurse(router_a, router_b, 2);
    155
    156	return LOCAL_DISTANCE + router_distance;
    157}
    158
    159static void __init init_topology_matrix(void)
    160{
    161	nasid_t row, col;
    162
    163	for (row = 0; row < MAX_NUMNODES; row++)
    164		for (col = 0; col < MAX_NUMNODES; col++)
    165			__node_distances[row][col] = -1;
    166
    167	for_each_online_node(row) {
    168		for_each_online_node(col) {
    169			__node_distances[row][col] =
    170				compute_node_distance(row, col);
    171		}
    172	}
    173}
    174
    175static void __init dump_topology(void)
    176{
    177	nasid_t nasid;
    178	lboard_t *brd, *dest_brd;
    179	int port;
    180	int router_num = 0;
    181	klrou_t *router;
    182	nasid_t row, col;
    183
    184	pr_info("************** Topology ********************\n");
    185
    186	pr_info("    ");
    187	for_each_online_node(col)
    188		pr_cont("%02d ", col);
    189	pr_cont("\n");
    190	for_each_online_node(row) {
    191		pr_info("%02d  ", row);
    192		for_each_online_node(col)
    193			pr_cont("%2d ", node_distance(row, col));
    194		pr_cont("\n");
    195	}
    196
    197	for_each_online_node(nasid) {
    198		brd = find_lboard_class((lboard_t *)KL_CONFIG_INFO(nasid),
    199					KLTYPE_ROUTER);
    200
    201		if (!brd)
    202			continue;
    203
    204		do {
    205			if (brd->brd_flags & DUPLICATE_BOARD)
    206				continue;
    207			pr_cont("Router %d:", router_num);
    208			router_num++;
    209
    210			router = (klrou_t *)NODE_OFFSET_TO_K0(NASID_GET(brd), brd->brd_compts[0]);
    211
    212			for (port = 1; port <= MAX_ROUTER_PORTS; port++) {
    213				if (router->rou_port[port].port_nasid == INVALID_NASID)
    214					continue;
    215
    216				dest_brd = (lboard_t *)NODE_OFFSET_TO_K0(
    217					router->rou_port[port].port_nasid,
    218					router->rou_port[port].port_offset);
    219
    220				if (dest_brd->brd_type == KLTYPE_IP27)
    221					pr_cont(" %d", dest_brd->brd_nasid);
    222				if (dest_brd->brd_type == KLTYPE_ROUTER)
    223					pr_cont(" r");
    224			}
    225			pr_cont("\n");
    226
    227		} while ( (brd = find_lboard_class(KLCF_NEXT(brd), KLTYPE_ROUTER)) );
    228	}
    229}
    230
    231static unsigned long __init slot_getbasepfn(nasid_t nasid, int slot)
    232{
    233	return ((unsigned long)nasid << PFN_NASIDSHFT) | (slot << SLOT_PFNSHIFT);
    234}
    235
    236static unsigned long __init slot_psize_compute(nasid_t nasid, int slot)
    237{
    238	lboard_t *brd;
    239	klmembnk_t *banks;
    240	unsigned long size;
    241
    242	/* Find the node board */
    243	brd = find_lboard((lboard_t *)KL_CONFIG_INFO(nasid), KLTYPE_IP27);
    244	if (!brd)
    245		return 0;
    246
    247	/* Get the memory bank structure */
    248	banks = (klmembnk_t *) find_first_component(brd, KLSTRUCT_MEMBNK);
    249	if (!banks)
    250		return 0;
    251
    252	/* Size in _Megabytes_ */
    253	size = (unsigned long)banks->membnk_bnksz[slot/4];
    254
    255	/* hack for 128 dimm banks */
    256	if (size <= 128) {
    257		if (slot % 4 == 0) {
    258			size <<= 20;		/* size in bytes */
    259			return size >> PAGE_SHIFT;
    260		} else
    261			return 0;
    262	} else {
    263		size /= 4;
    264		size <<= 20;
    265		return size >> PAGE_SHIFT;
    266	}
    267}
    268
    269static void __init mlreset(void)
    270{
    271	u64 region_mask;
    272	nasid_t nasid;
    273
    274	master_nasid = get_nasid();
    275
    276	/*
    277	 * Probe for all CPUs - this creates the cpumask and sets up the
    278	 * mapping tables.  We need to do this as early as possible.
    279	 */
    280#ifdef CONFIG_SMP
    281	cpu_node_probe();
    282#endif
    283
    284	init_topology_matrix();
    285	dump_topology();
    286
    287	region_mask = gen_region_mask();
    288
    289	setup_replication_mask();
    290
    291	/*
    292	 * Set all nodes' calias sizes to 8k
    293	 */
    294	for_each_online_node(nasid) {
    295		/*
    296		 * Always have node 0 in the region mask, otherwise
    297		 * CALIAS accesses get exceptions since the hub
    298		 * thinks it is a node 0 address.
    299		 */
    300		REMOTE_HUB_S(nasid, PI_REGION_PRESENT, (region_mask | 1));
    301		REMOTE_HUB_S(nasid, PI_CALIAS_SIZE, PI_CALIAS_SIZE_0);
    302
    303#ifdef LATER
    304		/*
    305		 * Set up all hubs to have a big window pointing at
    306		 * widget 0. Memory mode, widget 0, offset 0
    307		 */
    308		REMOTE_HUB_S(nasid, IIO_ITTE(SWIN0_BIGWIN),
    309			((HUB_PIO_MAP_TO_MEM << IIO_ITTE_IOSP_SHIFT) |
    310			(0 << IIO_ITTE_WIDGET_SHIFT)));
    311#endif
    312	}
    313}
    314
    315static void __init szmem(void)
    316{
    317	unsigned long slot_psize, slot0sz = 0, nodebytes;	/* Hack to detect problem configs */
    318	int slot;
    319	nasid_t node;
    320
    321	for_each_online_node(node) {
    322		nodebytes = 0;
    323		for (slot = 0; slot < MAX_MEM_SLOTS; slot++) {
    324			slot_psize = slot_psize_compute(node, slot);
    325			if (slot == 0)
    326				slot0sz = slot_psize;
    327			/*
    328			 * We need to refine the hack when we have replicated
    329			 * kernel text.
    330			 */
    331			nodebytes += (1LL << SLOT_SHIFT);
    332
    333			if (!slot_psize)
    334				continue;
    335
    336			if ((nodebytes >> PAGE_SHIFT) * (sizeof(struct page)) >
    337						(slot0sz << PAGE_SHIFT)) {
    338				pr_info("Ignoring slot %d onwards on node %d\n",
    339								slot, node);
    340				slot = MAX_MEM_SLOTS;
    341				continue;
    342			}
    343			memblock_add_node(PFN_PHYS(slot_getbasepfn(node, slot)),
    344					  PFN_PHYS(slot_psize), node,
    345					  MEMBLOCK_NONE);
    346		}
    347	}
    348}
    349
    350static void __init node_mem_init(nasid_t node)
    351{
    352	unsigned long slot_firstpfn = slot_getbasepfn(node, 0);
    353	unsigned long slot_freepfn = node_getfirstfree(node);
    354	unsigned long start_pfn, end_pfn;
    355
    356	get_pfn_range_for_nid(node, &start_pfn, &end_pfn);
    357
    358	/*
    359	 * Allocate the node data structures on the node first.
    360	 */
    361	__node_data[node] = __va(slot_freepfn << PAGE_SHIFT);
    362	memset(__node_data[node], 0, PAGE_SIZE);
    363
    364	NODE_DATA(node)->node_start_pfn = start_pfn;
    365	NODE_DATA(node)->node_spanned_pages = end_pfn - start_pfn;
    366
    367	cpumask_clear(&hub_data(node)->h_cpus);
    368
    369	slot_freepfn += PFN_UP(sizeof(struct pglist_data) +
    370			       sizeof(struct hub_data));
    371
    372	memblock_reserve(slot_firstpfn << PAGE_SHIFT,
    373			 ((slot_freepfn - slot_firstpfn) << PAGE_SHIFT));
    374}
    375
    376/*
    377 * A node with nothing.	 We use it to avoid any special casing in
    378 * cpumask_of_node
    379 */
    380static struct node_data null_node = {
    381	.hub = {
    382		.h_cpus = CPU_MASK_NONE
    383	}
    384};
    385
    386/*
    387 * Currently, the intranode memory hole support assumes that each slot
    388 * contains at least 32 MBytes of memory. We assume all bootmem data
    389 * fits on the first slot.
    390 */
    391void __init prom_meminit(void)
    392{
    393	nasid_t node;
    394
    395	mlreset();
    396	szmem();
    397	max_low_pfn = PHYS_PFN(memblock_end_of_DRAM());
    398
    399	for (node = 0; node < MAX_NUMNODES; node++) {
    400		if (node_online(node)) {
    401			node_mem_init(node);
    402			continue;
    403		}
    404		__node_data[node] = &null_node;
    405	}
    406}
    407
    408extern void setup_zero_pages(void);
    409
    410void __init paging_init(void)
    411{
    412	unsigned long zones_size[MAX_NR_ZONES] = {0, };
    413
    414	pagetable_init();
    415	zones_size[ZONE_NORMAL] = max_low_pfn;
    416	free_area_init(zones_size);
    417}
    418
    419void __init mem_init(void)
    420{
    421	high_memory = (void *) __va(get_num_physpages() << PAGE_SHIFT);
    422	memblock_free_all();
    423	setup_zero_pages();	/* This comes from node 0 */
    424}
    425
    426pg_data_t * __init arch_alloc_nodedata(int nid)
    427{
    428	return memblock_alloc(sizeof(pg_data_t), SMP_CACHE_BYTES);
    429}
    430
    431void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
    432{
    433	__node_data[nid] = (struct node_data *)pgdat;
    434}