diff options
Diffstat (limited to 'arch/ia64/kernel/palinfo.c')
| -rw-r--r-- | arch/ia64/kernel/palinfo.c | 1023 |
1 files changed, 1023 insertions, 0 deletions
diff --git a/arch/ia64/kernel/palinfo.c b/arch/ia64/kernel/palinfo.c new file mode 100644 index 0000000..25e7c83 --- /dev/null +++ b/arch/ia64/kernel/palinfo.c @@ -0,0 +1,1023 @@ +/* + * palinfo.c + * + * Prints processor specific information reported by PAL. + * This code is based on specification of PAL as of the + * Intel IA-64 Architecture Software Developer's Manual v1.0. + * + * + * Copyright (C) 2000-2001, 2003 Hewlett-Packard Co + * Stephane Eranian <eranian@hpl.hp.com> + * Copyright (C) 2004 Intel Corporation + * Ashok Raj <ashok.raj@intel.com> + * + * 05/26/2000 S.Eranian initial release + * 08/21/2000 S.Eranian updated to July 2000 PAL specs + * 02/05/2001 S.Eranian fixed module support + * 10/23/2001 S.Eranian updated pal_perf_mon_info bug fixes + * 03/24/2004 Ashok Raj updated to work with CPU Hotplug + */ +#include <linux/config.h> +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/proc_fs.h> +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/efi.h> +#include <linux/notifier.h> +#include <linux/cpu.h> +#include <linux/cpumask.h> + +#include <asm/pal.h> +#include <asm/sal.h> +#include <asm/page.h> +#include <asm/processor.h> +#include <linux/smp.h> + +MODULE_AUTHOR("Stephane Eranian <eranian@hpl.hp.com>"); +MODULE_DESCRIPTION("/proc interface to IA-64 PAL"); +MODULE_LICENSE("GPL"); + +#define PALINFO_VERSION "0.5" + +typedef int (*palinfo_func_t)(char*); + +typedef struct { + const char *name; /* name of the proc entry */ + palinfo_func_t proc_read; /* function to call for reading */ + struct proc_dir_entry *entry; /* registered entry (removal) */ +} palinfo_entry_t; + + +/* + * A bunch of string array to get pretty printing + */ + +static char *cache_types[] = { + "", /* not used */ + "Instruction", + "Data", + "Data/Instruction" /* unified */ +}; + +static const char *cache_mattrib[]={ + "WriteThrough", + "WriteBack", + "", /* reserved */ + "" /* reserved */ +}; + +static const char *cache_st_hints[]={ + "Temporal, level 1", + "Reserved", + "Reserved", + "Non-temporal, all levels", + "Reserved", + "Reserved", + "Reserved", + "Reserved" +}; + +static const char *cache_ld_hints[]={ + "Temporal, level 1", + "Non-temporal, level 1", + "Reserved", + "Non-temporal, all levels", + "Reserved", + "Reserved", + "Reserved", + "Reserved" +}; + +static const char *rse_hints[]={ + "enforced lazy", + "eager stores", + "eager loads", + "eager loads and stores" +}; + +#define RSE_HINTS_COUNT ARRAY_SIZE(rse_hints) + +static const char *mem_attrib[]={ + "WB", /* 000 */ + "SW", /* 001 */ + "010", /* 010 */ + "011", /* 011 */ + "UC", /* 100 */ + "UCE", /* 101 */ + "WC", /* 110 */ + "NaTPage" /* 111 */ +}; + +/* + * Take a 64bit vector and produces a string such that + * if bit n is set then 2^n in clear text is generated. The adjustment + * to the right unit is also done. + * + * Input: + * - a pointer to a buffer to hold the string + * - a 64-bit vector + * Ouput: + * - a pointer to the end of the buffer + * + */ +static char * +bitvector_process(char *p, u64 vector) +{ + int i,j; + const char *units[]={ "", "K", "M", "G", "T" }; + + for (i=0, j=0; i < 64; i++ , j=i/10) { + if (vector & 0x1) { + p += sprintf(p, "%d%s ", 1 << (i-j*10), units[j]); + } + vector >>= 1; + } + return p; +} + +/* + * Take a 64bit vector and produces a string such that + * if bit n is set then register n is present. The function + * takes into account consecutive registers and prints out ranges. + * + * Input: + * - a pointer to a buffer to hold the string + * - a 64-bit vector + * Ouput: + * - a pointer to the end of the buffer + * + */ +static char * +bitregister_process(char *p, u64 *reg_info, int max) +{ + int i, begin, skip = 0; + u64 value = reg_info[0]; + + value >>= i = begin = ffs(value) - 1; + + for(; i < max; i++ ) { + + if (i != 0 && (i%64) == 0) value = *++reg_info; + + if ((value & 0x1) == 0 && skip == 0) { + if (begin <= i - 2) + p += sprintf(p, "%d-%d ", begin, i-1); + else + p += sprintf(p, "%d ", i-1); + skip = 1; + begin = -1; + } else if ((value & 0x1) && skip == 1) { + skip = 0; + begin = i; + } + value >>=1; + } + if (begin > -1) { + if (begin < 127) + p += sprintf(p, "%d-127", begin); + else + p += sprintf(p, "127"); + } + + return p; +} + +static int +power_info(char *page) +{ + s64 status; + char *p = page; + u64 halt_info_buffer[8]; + pal_power_mgmt_info_u_t *halt_info =(pal_power_mgmt_info_u_t *)halt_info_buffer; + int i; + + status = ia64_pal_halt_info(halt_info); + if (status != 0) return 0; + + for (i=0; i < 8 ; i++ ) { + if (halt_info[i].pal_power_mgmt_info_s.im == 1) { + p += sprintf(p, "Power level %d:\n" + "\tentry_latency : %d cycles\n" + "\texit_latency : %d cycles\n" + "\tpower consumption : %d mW\n" + "\tCache+TLB coherency : %s\n", i, + halt_info[i].pal_power_mgmt_info_s.entry_latency, + halt_info[i].pal_power_mgmt_info_s.exit_latency, + halt_info[i].pal_power_mgmt_info_s.power_consumption, + halt_info[i].pal_power_mgmt_info_s.co ? "Yes" : "No"); + } else { + p += sprintf(p,"Power level %d: not implemented\n",i); + } + } + return p - page; +} + +static int +cache_info(char *page) +{ + char *p = page; + u64 i, levels, unique_caches; + pal_cache_config_info_t cci; + int j, k; + s64 status; + + if ((status = ia64_pal_cache_summary(&levels, &unique_caches)) != 0) { + printk(KERN_ERR "ia64_pal_cache_summary=%ld\n", status); + return 0; + } + + p += sprintf(p, "Cache levels : %ld\nUnique caches : %ld\n\n", levels, unique_caches); + + for (i=0; i < levels; i++) { + + for (j=2; j >0 ; j--) { + + /* even without unification some level may not be present */ + if ((status=ia64_pal_cache_config_info(i,j, &cci)) != 0) { + continue; + } + p += sprintf(p, + "%s Cache level %lu:\n" + "\tSize : %lu bytes\n" + "\tAttributes : ", + cache_types[j+cci.pcci_unified], i+1, + cci.pcci_cache_size); + + if (cci.pcci_unified) p += sprintf(p, "Unified "); + + p += sprintf(p, "%s\n", cache_mattrib[cci.pcci_cache_attr]); + + p += sprintf(p, + "\tAssociativity : %d\n" + "\tLine size : %d bytes\n" + "\tStride : %d bytes\n", + cci.pcci_assoc, 1<<cci.pcci_line_size, 1<<cci.pcci_stride); + if (j == 1) + p += sprintf(p, "\tStore latency : N/A\n"); + else + p += sprintf(p, "\tStore latency : %d cycle(s)\n", + cci.pcci_st_latency); + + p += sprintf(p, + "\tLoad latency : %d cycle(s)\n" + "\tStore hints : ", cci.pcci_ld_latency); + + for(k=0; k < 8; k++ ) { + if ( cci.pcci_st_hints & 0x1) + p += sprintf(p, "[%s]", cache_st_hints[k]); + cci.pcci_st_hints >>=1; + } + p += sprintf(p, "\n\tLoad hints : "); + + for(k=0; k < 8; k++ ) { + if (cci.pcci_ld_hints & 0x1) + p += sprintf(p, "[%s]", cache_ld_hints[k]); + cci.pcci_ld_hints >>=1; + } + p += sprintf(p, + "\n\tAlias boundary : %d byte(s)\n" + "\tTag LSB : %d\n" + "\tTag MSB : %d\n", + 1<<cci.pcci_alias_boundary, cci.pcci_tag_lsb, + cci.pcci_tag_msb); + + /* when unified, data(j=2) is enough */ + if (cci.pcci_unified) break; + } + } + return p - page; +} + + +static int +vm_info(char *page) +{ + char *p = page; + u64 tr_pages =0, vw_pages=0, tc_pages; + u64 attrib; + pal_vm_info_1_u_t vm_info_1; + pal_vm_info_2_u_t vm_info_2; + pal_tc_info_u_t tc_info; + ia64_ptce_info_t ptce; + const char *sep; + int i, j; + s64 status; + + if ((status = ia64_pal_vm_summary(&vm_info_1, &vm_info_2)) !=0) { + printk(KERN_ERR "ia64_pal_vm_summary=%ld\n", status); + return 0; + } + + + p += sprintf(p, + "Physical Address Space : %d bits\n" + "Virtual Address Space : %d bits\n" + "Protection Key Registers(PKR) : %d\n" + "Implemented bits in PKR.key : %d\n" + "Hash Tag ID : 0x%x\n" + "Size of RR.rid : %d\n", + vm_info_1.pal_vm_info_1_s.phys_add_size, + vm_info_2.pal_vm_info_2_s.impl_va_msb+1, vm_info_1.pal_vm_info_1_s.max_pkr+1, + vm_info_1.pal_vm_info_1_s.key_size, vm_info_1.pal_vm_info_1_s.hash_tag_id, + vm_info_2.pal_vm_info_2_s.rid_size); + + if (ia64_pal_mem_attrib(&attrib) != 0) + return 0; + + p += sprintf(p, "Supported memory attributes : "); + sep = ""; + for (i = 0; i < 8; i++) { + if (attrib & (1 << i)) { + p += sprintf(p, "%s%s", sep, mem_attrib[i]); + sep = ", "; + } + } + p += sprintf(p, "\n"); + + if ((status = ia64_pal_vm_page_size(&tr_pages, &vw_pages)) !=0) { + printk(KERN_ERR "ia64_pal_vm_page_size=%ld\n", status); + return 0; + } + + p += sprintf(p, + "\nTLB walker : %simplemented\n" + "Number of DTR : %d\n" + "Number of ITR : %d\n" + "TLB insertable page sizes : ", + vm_info_1.pal_vm_info_1_s.vw ? "" : "not ", + vm_info_1.pal_vm_info_1_s.max_dtr_entry+1, + vm_info_1.pal_vm_info_1_s.max_itr_entry+1); + + + p = bitvector_process(p, tr_pages); + + p += sprintf(p, "\nTLB purgeable page sizes : "); + + p = bitvector_process(p, vw_pages); + + if ((status=ia64_get_ptce(&ptce)) != 0) { + printk(KERN_ERR "ia64_get_ptce=%ld\n", status); + return 0; + } + + p += sprintf(p, + "\nPurge base address : 0x%016lx\n" + "Purge outer loop count : %d\n" + "Purge inner loop count : %d\n" + "Purge outer loop stride : %d\n" + "Purge inner loop stride : %d\n", + ptce.base, ptce.count[0], ptce.count[1], ptce.stride[0], ptce.stride[1]); + + p += sprintf(p, + "TC Levels : %d\n" + "Unique TC(s) : %d\n", + vm_info_1.pal_vm_info_1_s.num_tc_levels, + vm_info_1.pal_vm_info_1_s.max_unique_tcs); + + for(i=0; i < vm_info_1.pal_vm_info_1_s.num_tc_levels; i++) { + for (j=2; j>0 ; j--) { + tc_pages = 0; /* just in case */ + + + /* even without unification, some levels may not be present */ + if ((status=ia64_pal_vm_info(i,j, &tc_info, &tc_pages)) != 0) { + continue; + } + + p += sprintf(p, + "\n%s Translation Cache Level %d:\n" + "\tHash sets : %d\n" + "\tAssociativity : %d\n" + "\tNumber of entries : %d\n" + "\tFlags : ", + cache_types[j+tc_info.tc_unified], i+1, tc_info.tc_num_sets, + tc_info.tc_associativity, tc_info.tc_num_entries); + + if (tc_info.tc_pf) p += sprintf(p, "PreferredPageSizeOptimized "); + if (tc_info.tc_unified) p += sprintf(p, "Unified "); + if (tc_info.tc_reduce_tr) p += sprintf(p, "TCReduction"); + + p += sprintf(p, "\n\tSupported page sizes: "); + + p = bitvector_process(p, tc_pages); + + /* when unified date (j=2) is enough */ + if (tc_info.tc_unified) break; + } + } + p += sprintf(p, "\n"); + + return p - page; +} + + +static int +register_info(char *page) +{ + char *p = page; + u64 reg_info[2]; + u64 info; + u64 phys_stacked; + pal_hints_u_t hints; + u64 iregs, dregs; + char *info_type[]={ + "Implemented AR(s)", + "AR(s) with read side-effects", + "Implemented CR(s)", + "CR(s) with read side-effects", + }; + + for(info=0; info < 4; info++) { + + if (ia64_pal_register_info(info, ®_info[0], ®_info[1]) != 0) return 0; + + p += sprintf(p, "%-32s : ", info_type[info]); + + p = bitregister_process(p, reg_info, 128); + + p += sprintf(p, "\n"); + } + + if (ia64_pal_rse_info(&phys_stacked, &hints) != 0) return 0; + + p += sprintf(p, + "RSE stacked physical registers : %ld\n" + "RSE load/store hints : %ld (%s)\n", + phys_stacked, hints.ph_data, + hints.ph_data < RSE_HINTS_COUNT ? rse_hints[hints.ph_data]: "(??)"); + + if (ia64_pal_debug_info(&iregs, &dregs)) + return 0; + + p += sprintf(p, + "Instruction debug register pairs : %ld\n" + "Data debug register pairs : %ld\n", iregs, dregs); + + return p - page; +} + +static const char *proc_features[]={ + NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL, + NULL,NULL,NULL,NULL,NULL,NULL,NULL, NULL,NULL, + NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL, + NULL,NULL,NULL,NULL,NULL, NULL,NULL,NULL,NULL, + NULL,NULL,NULL,NULL,NULL, + "XIP,XPSR,XFS implemented", + "XR1-XR3 implemented", + "Disable dynamic predicate prediction", + "Disable processor physical number", + "Disable dynamic data cache prefetch", + "Disable dynamic inst cache prefetch", + "Disable dynamic branch prediction", + NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, + "Disable BINIT on processor time-out", + "Disable dynamic power management (DPM)", + "Disable coherency", + "Disable cache", + "Enable CMCI promotion", + "Enable MCA to BINIT promotion", + "Enable MCA promotion", + "Enable BERR promotion" +}; + + +static int +processor_info(char *page) +{ + char *p = page; + const char **v = proc_features; + u64 avail=1, status=1, control=1; + int i; + s64 ret; + + if ((ret=ia64_pal_proc_get_features(&avail, &status, &control)) != 0) return 0; + + for(i=0; i < 64; i++, v++,avail >>=1, status >>=1, control >>=1) { + if ( ! *v ) continue; + p += sprintf(p, "%-40s : %s%s %s\n", *v, + avail & 0x1 ? "" : "NotImpl", + avail & 0x1 ? (status & 0x1 ? "On" : "Off"): "", + avail & 0x1 ? (control & 0x1 ? "Ctrl" : "NoCtrl"): ""); + } + return p - page; +} + +static const char *bus_features[]={ + NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL, + NULL,NULL,NULL,NULL,NULL,NULL,NULL, NULL,NULL, + NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL, + NULL,NULL, + "Request Bus Parking", + "Bus Lock Mask", + "Enable Half Transfer", + NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, + NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, + NULL, NULL, NULL, NULL, + "Enable Cache Line Repl. Shared", + "Enable Cache Line Repl. Exclusive", + "Disable Transaction Queuing", + "Disable Response Error Checking", + "Disable Bus Error Checking", + "Disable Bus Requester Internal Error Signalling", + "Disable Bus Requester Error Signalling", + "Disable Bus Initialization Event Checking", + "Disable Bus Initialization Event Signalling", + "Disable Bus Address Error Checking", + "Disable Bus Address Error Signalling", + "Disable Bus Data Error Checking" +}; + + +static int +bus_info(char *page) +{ + char *p = page; + const char **v = bus_features; + pal_bus_features_u_t av, st, ct; + u64 avail, status, control; + int i; + s64 ret; + + if ((ret=ia64_pal_bus_get_features(&av, &st, &ct)) != 0) return 0; + + avail = av.pal_bus_features_val; + status = st.pal_bus_features_val; + control = ct.pal_bus_features_val; + + for(i=0; i < 64; i++, v++, avail >>=1, status >>=1, control >>=1) { + if ( ! *v ) continue; + p += sprintf(p, "%-48s : %s%s %s\n", *v, + avail & 0x1 ? "" : "NotImpl", + avail & 0x1 ? (status & 0x1 ? "On" : "Off"): "", + avail & 0x1 ? (control & 0x1 ? "Ctrl" : "NoCtrl"): ""); + } + return p - page; +} + +static int +version_info(char *page) +{ + pal_version_u_t min_ver, cur_ver; + char *p = page; + + /* The PAL_VERSION call is advertised as being able to support + * both physical and virtual mode calls. This seems to be a documentation + * bug rather than firmware bug. In fact, it does only support physical mode. + * So now the code reflects this fact and the pal_version() has been updated + * accordingly. + */ + if (ia64_pal_version(&min_ver, &cur_ver) != 0) return 0; + + p += sprintf(p, + "PAL_vendor : 0x%02x (min=0x%02x)\n" + "PAL_A : %x.%x.%x (min=%x.%x.%x)\n" + "PAL_B : %x.%x.%x (min=%x.%x.%x)\n", + cur_ver.pal_version_s.pv_pal_vendor, min_ver.pal_version_s.pv_pal_vendor, + + cur_ver.pal_version_s.pv_pal_a_model>>4, + cur_ver.pal_version_s.pv_pal_a_model&0xf, cur_ver.pal_version_s.pv_pal_a_rev, + min_ver.pal_version_s.pv_pal_a_model>>4, + min_ver.pal_version_s.pv_pal_a_model&0xf, min_ver.pal_version_s.pv_pal_a_rev, + + cur_ver.pal_version_s.pv_pal_b_model>>4, + cur_ver.pal_version_s.pv_pal_b_model&0xf, cur_ver.pal_version_s.pv_pal_b_rev, + min_ver.pal_version_s.pv_pal_b_model>>4, + min_ver.pal_version_s.pv_pal_b_model&0xf, min_ver.pal_version_s.pv_pal_b_rev); + return p - page; +} + +static int +perfmon_info(char *page) +{ + char *p = page; + u64 pm_buffer[16]; + pal_perf_mon_info_u_t pm_info; + + if (ia64_pal_perf_mon_info(pm_buffer, &pm_info) != 0) return 0; + + p += sprintf(p, + "PMC/PMD pairs : %d\n" + "Counter width : %d bits\n" + "Cycle event number : %d\n" + "Retired event number : %d\n" + "Implemented PMC : ", + pm_info.pal_perf_mon_info_s.generic, pm_info.pal_perf_mon_info_s.width, + pm_info.pal_perf_mon_info_s.cycles, pm_info.pal_perf_mon_info_s.retired); + + p = bitregister_process(p, pm_buffer, 256); + p += sprintf(p, "\nImplemented PMD : "); + p = bitregister_process(p, pm_buffer+4, 256); + p += sprintf(p, "\nCycles count capable : "); + p = bitregister_process(p, pm_buffer+8, 256); + p += sprintf(p, "\nRetired bundles count capable : "); + +#ifdef CONFIG_ITANIUM + /* + * PAL_PERF_MON_INFO reports that only PMC4 can be used to count CPU_CYCLES + * which is wrong, both PMC4 and PMD5 support it. + */ + if (pm_buffer[12] == 0x10) pm_buffer[12]=0x30; +#endif + + p = bitregister_process(p, pm_buffer+12, 256); + + p += sprintf(p, "\n"); + + return p - page; +} + +static int +frequency_info(char *page) +{ + char *p = page; + struct pal_freq_ratio proc, itc, bus; + u64 base; + + if (ia64_pal_freq_base(&base) == -1) + p += sprintf(p, "Output clock : not implemented\n"); + else + p += sprintf(p, "Output clock : %ld ticks/s\n", base); + + if (ia64_pal_freq_ratios(&proc, &bus, &itc) != 0) return 0; + + p += sprintf(p, + "Processor/Clock ratio : %ld/%ld\n" + "Bus/Clock ratio : %ld/%ld\n" + "ITC/Clock ratio : %ld/%ld\n", + proc.num, proc.den, bus.num, bus.den, itc.num, itc.den); + + return p - page; +} + +static int +tr_info(char *page) +{ + char *p = page; + s64 status; + pal_tr_valid_u_t tr_valid; + u64 tr_buffer[4]; + pal_vm_info_1_u_t vm_info_1; + pal_vm_info_2_u_t vm_info_2; + u64 i, j; + u64 max[3], pgm; + struct ifa_reg { + u64 valid:1; + u64 ig:11; + u64 vpn:52; + } *ifa_reg; + struct itir_reg { + u64 rv1:2; + u64 ps:6; + u64 key:24; + u64 rv2:32; + } *itir_reg; + struct gr_reg { + u64 p:1; + u64 rv1:1; + u64 ma:3; + u64 a:1; + u64 d:1; + u64 pl:2; + u64 ar:3; + u64 ppn:38; + u64 rv2:2; + u64 ed:1; + u64 ig:11; + } *gr_reg; + struct rid_reg { + u64 ig1:1; + u64 rv1:1; + u64 ig2:6; + u64 rid:24; + u64 rv2:32; + } *rid_reg; + + if ((status = ia64_pal_vm_summary(&vm_info_1, &vm_info_2)) !=0) { + printk(KERN_ERR "ia64_pal_vm_summary=%ld\n", status); + return 0; + } + max[0] = vm_info_1.pal_vm_info_1_s.max_itr_entry+1; + max[1] = vm_info_1.pal_vm_info_1_s.max_dtr_entry+1; + + for (i=0; i < 2; i++ ) { + for (j=0; j < max[i]; j++) { + + status = ia64_pal_tr_read(j, i, tr_buffer, &tr_valid); + if (status != 0) { + printk(KERN_ERR "palinfo: pal call failed on tr[%lu:%lu]=%ld\n", + i, j, status); + continue; + } + + ifa_reg = (struct ifa_reg *)&tr_buffer[2]; + + if (ifa_reg->valid == 0) continue; + + gr_reg = (struct gr_reg *)tr_buffer; + itir_reg = (struct itir_reg *)&tr_buffer[1]; + rid_reg = (struct rid_reg *)&tr_buffer[3]; + + pgm = -1 << (itir_reg->ps - 12); + p += sprintf(p, + "%cTR%lu: av=%d pv=%d dv=%d mv=%d\n" + "\tppn : 0x%lx\n" + "\tvpn : 0x%lx\n" + "\tps : ", + "ID"[i], j, + tr_valid.pal_tr_valid_s.access_rights_valid, + tr_valid.pal_tr_valid_s.priv_level_valid, + tr_valid.pal_tr_valid_s.dirty_bit_valid, + tr_valid.pal_tr_valid_s.mem_attr_valid, + (gr_reg->ppn & pgm)<< 12, (ifa_reg->vpn & pgm)<< 12); + + p = bitvector_process(p, 1<< itir_reg->ps); + + p += sprintf(p, + "\n\tpl : %d\n" + "\tar : %d\n" + "\trid : %x\n" + "\tp : %d\n" + "\tma : %d\n" + "\td : %d\n", + gr_reg->pl, gr_reg->ar, rid_reg->rid, gr_reg->p, gr_reg->ma, + gr_reg->d); + } + } + return p - page; +} + + + +/* + * List {name,function} pairs for every entry in /proc/palinfo/cpu* + */ +static palinfo_entry_t palinfo_entries[]={ + { "version_info", version_info, }, + { "vm_info", vm_info, }, + { "cache_info", cache_info, }, + { "power_info", power_info, }, + { "register_info", register_info, }, + { "processor_info", processor_info, }, + { "perfmon_info", perfmon_info, }, + { "frequency_info", frequency_info, }, + { "bus_info", bus_info }, + { "tr_info", tr_info, } +}; + +#define NR_PALINFO_ENTRIES (int) ARRAY_SIZE(palinfo_entries) + +/* + * this array is used to keep track of the proc entries we create. This is + * required in the module mode when we need to remove all entries. The procfs code + * does not do recursion of deletion + * + * Notes: + * - +1 accounts for the cpuN directory entry in /proc/pal + */ +#define NR_PALINFO_PROC_ENTRIES (NR_CPUS*(NR_PALINFO_ENTRIES+1)) + +static struct proc_dir_entry *palinfo_proc_entries[NR_PALINFO_PROC_ENTRIES]; +static struct proc_dir_entry *palinfo_dir; + +/* + * This data structure is used to pass which cpu,function is being requested + * It must fit in a 64bit quantity to be passed to the proc callback routine + * + * In SMP mode, when we get a request for another CPU, we must call that + * other CPU using IPI and wait for the result before returning. + */ +typedef union { + u64 value; + struct { + unsigned req_cpu: 32; /* for which CPU this info is */ + unsigned func_id: 32; /* which function is requested */ + } pal_func_cpu; +} pal_func_cpu_u_t; + +#define req_cpu pal_func_cpu.req_cpu +#define func_id pal_func_cpu.func_id + +#ifdef CONFIG_SMP + +/* + * used to hold information about final function to call + */ +typedef struct { + palinfo_func_t func; /* pointer to function to call */ + char *page; /* buffer to store results */ + int ret; /* return value from call */ +} palinfo_smp_data_t; + + +/* + * this function does the actual final call and he called + * from the smp code, i.e., this is the palinfo callback routine + */ +static void +palinfo_smp_call(void *info) +{ + palinfo_smp_data_t *data = (palinfo_smp_data_t *)info; + if (data == NULL) { + printk(KERN_ERR "palinfo: data pointer is NULL\n"); + data->ret = 0; /* no output */ + return; + } + /* does this actual call */ + data->ret = (*data->func)(data->page); +} + +/* + * function called to trigger the IPI, we need to access a remote CPU + * Return: + * 0 : error or nothing to output + * otherwise how many bytes in the "page" buffer were written + */ +static +int palinfo_handle_smp(pal_func_cpu_u_t *f, char *page) +{ + palinfo_smp_data_t ptr; + int ret; + + ptr.func = palinfo_entries[f->func_id].proc_read; + ptr.page = page; + ptr.ret = 0; /* just in case */ + + + /* will send IPI to other CPU and wait for completion of remote call */ + if ((ret=smp_call_function_single(f->req_cpu, palinfo_smp_call, &ptr, 0, 1))) { + printk(KERN_ERR "palinfo: remote CPU call from %d to %d on function %d: " + "error %d\n", smp_processor_id(), f->req_cpu, f->func_id, ret); + return 0; + } + return ptr.ret; +} +#else /* ! CONFIG_SMP */ +static +int palinfo_handle_smp(pal_func_cpu_u_t *f, char *page) +{ + printk(KERN_ERR "palinfo: should not be called with non SMP kernel\n"); + return 0; +} +#endif /* CONFIG_SMP */ + +/* + * Entry point routine: all calls go through this function + */ +static int +palinfo_read_entry(char *page, char **start, off_t off, int count, int *eof, void *data) +{ + int len=0; + pal_func_cpu_u_t *f = (pal_func_cpu_u_t *)&data; + + /* + * in SMP mode, we may need to call another CPU to get correct + * information. PAL, by definition, is processor specific + */ + if (f->req_cpu == get_cpu()) + len = (*palinfo_entries[f->func_id].proc_read)(page); + else + len = palinfo_handle_smp(f, page); + + put_cpu(); + + if (len <= off+count) *eof = 1; + + *start = page + off; + len -= off; + + if (len>count) len = count; + if (len<0) len = 0; + + return len; +} + +static void +create_palinfo_proc_entries(unsigned int cpu) +{ +# define CPUSTR "cpu%d" + + pal_func_cpu_u_t f; + struct proc_dir_entry **pdir; + struct proc_dir_entry *cpu_dir; + int j; + char cpustr[sizeof(CPUSTR)]; + + + /* + * we keep track of created entries in a depth-first order for + * cleanup purposes. Each entry is stored into palinfo_proc_entries + */ + sprintf(cpustr,CPUSTR, cpu); + + cpu_dir = proc_mkdir(cpustr, palinfo_dir); + + f.req_cpu = cpu; + + /* + * Compute the location to store per cpu entries + * We dont store the top level entry in this list, but + * remove it finally after removing all cpu entries. + */ + pdir = &palinfo_proc_entries[cpu*(NR_PALINFO_ENTRIES+1)]; + *pdir++ = cpu_dir; + for (j=0; j < NR_PALINFO_ENTRIES; j++) { + f.func_id = j; + *pdir = create_proc_read_entry( + palinfo_entries[j].name, 0, cpu_dir, + palinfo_read_entry, (void *)f.value); + if (*pdir) + (*pdir)->owner = THIS_MODULE; + pdir++; + } +} + +static void +remove_palinfo_proc_entries(unsigned int hcpu) +{ + int j; + struct proc_dir_entry *cpu_dir, **pdir; + + pdir = &palinfo_proc_entries[hcpu*(NR_PALINFO_ENTRIES+1)]; + cpu_dir = *pdir; + *pdir++=NULL; + for (j=0; j < (NR_PALINFO_ENTRIES); j++) { + if ((*pdir)) { + remove_proc_entry ((*pdir)->name, cpu_dir); + *pdir ++= NULL; + } + } + + if (cpu_dir) { + remove_proc_entry(cpu_dir->name, palinfo_dir); + } +} + +static int __devinit palinfo_cpu_callback(struct notifier_block *nfb, + unsigned long action, + void *hcpu) +{ + unsigned int hotcpu = (unsigned long)hcpu; + + switch (action) { + case CPU_ONLINE: + create_palinfo_proc_entries(hotcpu); + break; +#ifdef CONFIG_HOTPLUG_CPU + case CPU_DEAD: + remove_palinfo_proc_entries(hotcpu); + break; +#endif + } + return NOTIFY_OK; +} + +static struct notifier_block palinfo_cpu_notifier = +{ + .notifier_call = palinfo_cpu_callback, + .priority = 0, +}; + +static int __init +palinfo_init(void) +{ + int i = 0; + + printk(KERN_INFO "PAL Information Facility v%s\n", PALINFO_VERSION); + palinfo_dir = proc_mkdir("pal", NULL); + + /* Create palinfo dirs in /proc for all online cpus */ + for_each_online_cpu(i) { + create_palinfo_proc_entries(i); + } + + /* Register for future delivery via notify registration */ + register_cpu_notifier(&palinfo_cpu_notifier); + + return 0; +} + +static void __exit +palinfo_exit(void) +{ + int i = 0; + + /* remove all nodes: depth first pass. Could optimize this */ + for_each_online_cpu(i) { + remove_palinfo_proc_entries(i); + } + + /* + * Remove the top level entry finally + */ + remove_proc_entry(palinfo_dir->name, NULL); + + /* + * Unregister from cpu notifier callbacks + */ + unregister_cpu_notifier(&palinfo_cpu_notifier); +} + +module_init(palinfo_init); +module_exit(palinfo_exit); |
