Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[sfrench/cifs-2.6.git] / arch / ia64 / uv / kernel / setup.c
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  * SGI UV Core Functions
7  *
8  * Copyright (C) 2008 Silicon Graphics, Inc. All rights reserved.
9  */
10
11 #include <linux/acpi.h>
12 #include <linux/efi.h>
13 #include <linux/module.h>
14 #include <linux/percpu.h>
15 #include <asm/uv/uv.h>
16 #include <asm/uv/uv_mmrs.h>
17 #include <asm/uv/uv_hub.h>
18
19 bool ia64_is_uv;
20 EXPORT_SYMBOL_GPL(ia64_is_uv);
21
22 DEFINE_PER_CPU(struct uv_hub_info_s, __uv_hub_info);
23 EXPORT_PER_CPU_SYMBOL_GPL(__uv_hub_info);
24
25 struct redir_addr {
26         unsigned long redirect;
27         unsigned long alias;
28 };
29
30 #define DEST_SHIFT UVH_RH_GAM_ALIAS210_REDIRECT_CONFIG_0_MMR_DEST_BASE_SHFT
31
32 static __initdata struct redir_addr redir_addrs[] = {
33         {UVH_RH_GAM_ALIAS210_REDIRECT_CONFIG_0_MMR, UVH_SI_ALIAS0_OVERLAY_CONFIG},
34         {UVH_RH_GAM_ALIAS210_REDIRECT_CONFIG_1_MMR, UVH_SI_ALIAS1_OVERLAY_CONFIG},
35         {UVH_RH_GAM_ALIAS210_REDIRECT_CONFIG_2_MMR, UVH_SI_ALIAS2_OVERLAY_CONFIG},
36 };
37
38 static __init void get_lowmem_redirect(unsigned long *base, unsigned long *size)
39 {
40         union uvh_si_alias0_overlay_config_u alias;
41         union uvh_rh_gam_alias210_redirect_config_2_mmr_u redirect;
42         int i;
43
44         for (i = 0; i < ARRAY_SIZE(redir_addrs); i++) {
45                 alias.v = uv_read_local_mmr(redir_addrs[i].alias);
46                 if (alias.s.base == 0) {
47                         *size = (1UL << alias.s.m_alias);
48                         redirect.v = uv_read_local_mmr(redir_addrs[i].redirect);
49                         *base = (unsigned long)redirect.s.dest_base << DEST_SHIFT;
50                         return;
51                 }
52         }
53         BUG();
54 }
55
56 void __init uv_probe_system_type(void)
57 {
58         struct acpi_table_rsdp *rsdp;
59         struct acpi_table_xsdt *xsdt;
60
61         if (efi.acpi20 == EFI_INVALID_TABLE_ADDR) {
62                 pr_err("ACPI 2.0 RSDP not found.\n");
63                 return;
64         }
65
66         rsdp = (struct acpi_table_rsdp *)__va(efi.acpi20);
67         if (strncmp(rsdp->signature, ACPI_SIG_RSDP, sizeof(ACPI_SIG_RSDP) - 1)) {
68                 pr_err("ACPI 2.0 RSDP signature incorrect.\n");
69                 return;
70         }
71
72         xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_physical_address);
73         if (strncmp(xsdt->header.signature, ACPI_SIG_XSDT,
74                         sizeof(ACPI_SIG_XSDT) - 1)) {
75                 pr_err("ACPI 2.0 XSDT signature incorrect.\n");
76                 return;
77         }
78
79         if (!strcmp(xsdt->header.oem_id, "SGI") &&
80             !strcmp(xsdt->header.oem_table_id + 4, "UV"))
81                 ia64_is_uv = true;
82 }
83
84 void __init uv_setup(char **cmdline_p)
85 {
86         union uvh_si_addr_map_config_u m_n_config;
87         union uvh_node_id_u node_id;
88         unsigned long gnode_upper;
89         int nid, cpu, m_val, n_val;
90         unsigned long mmr_base, lowmem_redir_base, lowmem_redir_size;
91
92         get_lowmem_redirect(&lowmem_redir_base, &lowmem_redir_size);
93         node_id.v = uv_read_local_mmr(UVH_NODE_ID);
94         m_n_config.v = uv_read_local_mmr(UVH_SI_ADDR_MAP_CONFIG);
95         mmr_base = uv_read_local_mmr(UVH_RH_GAM_MMR_OVERLAY_CONFIG_MMR) &
96                         ~UV_MMR_ENABLE;
97
98         m_val = m_n_config.s.m_skt;
99         n_val = m_n_config.s.n_skt;
100         printk(KERN_DEBUG "UV: global MMR base 0x%lx\n", mmr_base);
101
102         gnode_upper = (((unsigned long)node_id.s.node_id) &
103                        ~((1 << n_val) - 1)) << m_val;
104
105         for_each_present_cpu(cpu) {
106                 nid = cpu_to_node(cpu);
107                 uv_cpu_hub_info(cpu)->lowmem_remap_base = lowmem_redir_base;
108                 uv_cpu_hub_info(cpu)->lowmem_remap_top =
109                         lowmem_redir_base + lowmem_redir_size;
110                 uv_cpu_hub_info(cpu)->m_val = m_val;
111                 uv_cpu_hub_info(cpu)->n_val = n_val;
112                 uv_cpu_hub_info(cpu)->pnode_mask = (1 << n_val) -1;
113                 uv_cpu_hub_info(cpu)->gpa_mask = (1 << (m_val + n_val)) - 1;
114                 uv_cpu_hub_info(cpu)->gnode_upper = gnode_upper;
115                 uv_cpu_hub_info(cpu)->global_mmr_base = mmr_base;
116                 uv_cpu_hub_info(cpu)->coherency_domain_number = 0;/* ZZZ */
117                 printk(KERN_DEBUG "UV cpu %d, nid %d\n", cpu, nid);
118         }
119 }
120