diff options
Diffstat (limited to 'arch/ia64/sn/kernel/sn2/sn_hwperf.c')
| -rw-r--r-- | arch/ia64/sn/kernel/sn2/sn_hwperf.c | 690 |
1 files changed, 690 insertions, 0 deletions
diff --git a/arch/ia64/sn/kernel/sn2/sn_hwperf.c b/arch/ia64/sn/kernel/sn2/sn_hwperf.c new file mode 100644 index 000000000000..197356460ee1 --- /dev/null +++ b/arch/ia64/sn/kernel/sn2/sn_hwperf.c @@ -0,0 +1,690 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2004-2005 Silicon Graphics, Inc. All rights reserved. + * + * SGI Altix topology and hardware performance monitoring API. + * Mark Goodwin <markgw@sgi.com>. + * + * Creates /proc/sgi_sn/sn_topology (read-only) to export + * info about Altix nodes, routers, CPUs and NumaLink + * interconnection/topology. + * + * Also creates a dynamic misc device named "sn_hwperf" + * that supports an ioctl interface to call down into SAL + * to discover hw objects, topology and to read/write + * memory mapped registers, e.g. for performance monitoring. + * The "sn_hwperf" device is registered only after the procfs + * file is first opened, i.e. only if/when it's needed. + * + * This API is used by SGI Performance Co-Pilot and other + * tools, see http://oss.sgi.com/projects/pcp + */ + +#include <linux/fs.h> +#include <linux/slab.h> +#include <linux/vmalloc.h> +#include <linux/seq_file.h> +#include <linux/miscdevice.h> +#include <linux/cpumask.h> +#include <linux/smp_lock.h> +#include <linux/nodemask.h> +#include <asm/processor.h> +#include <asm/topology.h> +#include <asm/smp.h> +#include <asm/semaphore.h> +#include <asm/segment.h> +#include <asm/uaccess.h> +#include <asm/sal.h> +#include <asm/sn/io.h> +#include <asm/sn/sn_sal.h> +#include <asm/sn/module.h> +#include <asm/sn/geo.h> +#include <asm/sn/sn2/sn_hwperf.h> + +static void *sn_hwperf_salheap = NULL; +static int sn_hwperf_obj_cnt = 0; +static nasid_t sn_hwperf_master_nasid = INVALID_NASID; +static int sn_hwperf_init(void); +static DECLARE_MUTEX(sn_hwperf_init_mutex); + +static int sn_hwperf_enum_objects(int *nobj, struct sn_hwperf_object_info **ret) +{ + int e; + u64 sz; + struct sn_hwperf_object_info *objbuf = NULL; + + if ((e = sn_hwperf_init()) < 0) { + printk("sn_hwperf_init failed: err %d\n", e); + goto out; + } + + sz = sn_hwperf_obj_cnt * sizeof(struct sn_hwperf_object_info); + if ((objbuf = (struct sn_hwperf_object_info *) vmalloc(sz)) == NULL) { + printk("sn_hwperf_enum_objects: vmalloc(%d) failed\n", (int)sz); + e = -ENOMEM; + goto out; + } + + e = ia64_sn_hwperf_op(sn_hwperf_master_nasid, SN_HWPERF_ENUM_OBJECTS, + 0, sz, (u64) objbuf, 0, 0, NULL); + if (e != SN_HWPERF_OP_OK) { + e = -EINVAL; + vfree(objbuf); + } + +out: + *nobj = sn_hwperf_obj_cnt; + *ret = objbuf; + return e; +} + +static int sn_hwperf_geoid_to_cnode(char *location) +{ + int cnode; + geoid_t geoid; + moduleid_t module_id; + char type; + int rack, slot, slab; + int this_rack, this_slot, this_slab; + + if (sscanf(location, "%03d%c%02d#%d", &rack, &type, &slot, &slab) != 4) + return -1; + + for (cnode = 0; cnode < numionodes; cnode++) { + geoid = cnodeid_get_geoid(cnode); + module_id = geo_module(geoid); + this_rack = MODULE_GET_RACK(module_id); + this_slot = MODULE_GET_BPOS(module_id); + this_slab = geo_slab(geoid); + if (rack == this_rack && slot == this_slot && slab == this_slab) + break; + } + + return cnode < numionodes ? cnode : -1; +} + +static int sn_hwperf_obj_to_cnode(struct sn_hwperf_object_info * obj) +{ + if (!obj->sn_hwp_this_part) + return -1; + return sn_hwperf_geoid_to_cnode(obj->location); +} + +static int sn_hwperf_generic_ordinal(struct sn_hwperf_object_info *obj, + struct sn_hwperf_object_info *objs) +{ + int ordinal; + struct sn_hwperf_object_info *p; + + for (ordinal=0, p=objs; p != obj; p++) { + if (SN_HWPERF_FOREIGN(p)) + continue; + if (SN_HWPERF_SAME_OBJTYPE(p, obj)) + ordinal++; + } + + return ordinal; +} + +static const char *slabname_node = "node"; /* SHub asic */ +static const char *slabname_ionode = "ionode"; /* TIO asic */ +static const char *slabname_router = "router"; /* NL3R or NL4R */ +static const char *slabname_other = "other"; /* unknown asic */ + +static const char *sn_hwperf_get_slabname(struct sn_hwperf_object_info *obj, + struct sn_hwperf_object_info *objs, int *ordinal) +{ + int isnode; + const char *slabname = slabname_other; + + if ((isnode = SN_HWPERF_IS_NODE(obj)) || SN_HWPERF_IS_IONODE(obj)) { + slabname = isnode ? slabname_node : slabname_ionode; + *ordinal = sn_hwperf_obj_to_cnode(obj); + } + else { + *ordinal = sn_hwperf_generic_ordinal(obj, objs); + if (SN_HWPERF_IS_ROUTER(obj)) + slabname = slabname_router; + } + + return slabname; +} + +static int sn_topology_show(struct seq_file *s, void *d) +{ + int sz; + int pt; + int e; + int i; + int j; + const char *slabname; + int ordinal; + cpumask_t cpumask; + char slice; + struct cpuinfo_ia64 *c; + struct sn_hwperf_port_info *ptdata; + struct sn_hwperf_object_info *p; + struct sn_hwperf_object_info *obj = d; /* this object */ + struct sn_hwperf_object_info *objs = s->private; /* all objects */ + + if (obj == objs) { + seq_printf(s, "# sn_topology version 1\n"); + seq_printf(s, "# objtype ordinal location partition" + " [attribute value [, ...]]\n"); + } + + if (SN_HWPERF_FOREIGN(obj)) { + /* private in another partition: not interesting */ + return 0; + } + + for (i = 0; obj->name[i]; i++) { + if (obj->name[i] == ' ') + obj->name[i] = '_'; + } + + slabname = sn_hwperf_get_slabname(obj, objs, &ordinal); + seq_printf(s, "%s %d %s %s asic %s", slabname, ordinal, obj->location, + obj->sn_hwp_this_part ? "local" : "shared", obj->name); + + if (!SN_HWPERF_IS_NODE(obj) && !SN_HWPERF_IS_IONODE(obj)) + seq_putc(s, '\n'); + else { + seq_printf(s, ", nasid 0x%x", cnodeid_to_nasid(ordinal)); + for (i=0; i < numionodes; i++) { + seq_printf(s, i ? ":%d" : ", dist %d", + node_distance(ordinal, i)); + } + seq_putc(s, '\n'); + + /* + * CPUs on this node, if any + */ + cpumask = node_to_cpumask(ordinal); + for_each_online_cpu(i) { + if (cpu_isset(i, cpumask)) { + slice = 'a' + cpuid_to_slice(i); + c = cpu_data(i); + seq_printf(s, "cpu %d %s%c local" + " freq %luMHz, arch ia64", + i, obj->location, slice, + c->proc_freq / 1000000); + for_each_online_cpu(j) { + seq_printf(s, j ? ":%d" : ", dist %d", + node_distance( + cpuid_to_cnodeid(i), + cpuid_to_cnodeid(j))); + } + seq_putc(s, '\n'); + } + } + } + + if (obj->ports) { + /* + * numalink ports + */ + sz = obj->ports * sizeof(struct sn_hwperf_port_info); + if ((ptdata = vmalloc(sz)) == NULL) + return -ENOMEM; + e = ia64_sn_hwperf_op(sn_hwperf_master_nasid, + SN_HWPERF_ENUM_PORTS, obj->id, sz, + (u64) ptdata, 0, 0, NULL); + if (e != SN_HWPERF_OP_OK) + return -EINVAL; + for (ordinal=0, p=objs; p != obj; p++) { + if (!SN_HWPERF_FOREIGN(p)) + ordinal += p->ports; + } + for (pt = 0; pt < obj->ports; pt++) { + for (p = objs, i = 0; i < sn_hwperf_obj_cnt; i++, p++) { + if (ptdata[pt].conn_id == p->id) { + break; + } + } + seq_printf(s, "numalink %d %s-%d", + ordinal+pt, obj->location, ptdata[pt].port); + + if (i >= sn_hwperf_obj_cnt) { + /* no connection */ + seq_puts(s, " local endpoint disconnected" + ", protocol unknown\n"); + continue; + } + + if (obj->sn_hwp_this_part && p->sn_hwp_this_part) + /* both ends local to this partition */ + seq_puts(s, " local"); + else if (!obj->sn_hwp_this_part && !p->sn_hwp_this_part) + /* both ends of the link in foreign partiton */ + seq_puts(s, " foreign"); + else + /* link straddles a partition */ + seq_puts(s, " shared"); + + /* + * Unlikely, but strictly should query the LLP config + * registers because an NL4R can be configured to run + * NL3 protocol, even when not talking to an NL3 router. + * Ditto for node-node. + */ + seq_printf(s, " endpoint %s-%d, protocol %s\n", + p->location, ptdata[pt].conn_port, + (SN_HWPERF_IS_NL3ROUTER(obj) || + SN_HWPERF_IS_NL3ROUTER(p)) ? "LLP3" : "LLP4"); + } + vfree(ptdata); + } + + return 0; +} + +static void *sn_topology_start(struct seq_file *s, loff_t * pos) +{ + struct sn_hwperf_object_info *objs = s->private; + + if (*pos < sn_hwperf_obj_cnt) + return (void *)(objs + *pos); + + return NULL; +} + +static void *sn_topology_next(struct seq_file *s, void *v, loff_t * pos) +{ + ++*pos; + return sn_topology_start(s, pos); +} + +static void sn_topology_stop(struct seq_file *m, void *v) +{ + return; +} + +/* + * /proc/sgi_sn/sn_topology, read-only using seq_file + */ +static struct seq_operations sn_topology_seq_ops = { + .start = sn_topology_start, + .next = sn_topology_next, + .stop = sn_topology_stop, + .show = sn_topology_show +}; + +struct sn_hwperf_op_info { + u64 op; + struct sn_hwperf_ioctl_args *a; + void *p; + int *v0; + int ret; +}; + +static void sn_hwperf_call_sal(void *info) +{ + struct sn_hwperf_op_info *op_info = info; + int r; + + r = ia64_sn_hwperf_op(sn_hwperf_master_nasid, op_info->op, + op_info->a->arg, op_info->a->sz, + (u64) op_info->p, 0, 0, op_info->v0); + op_info->ret = r; +} + +static int sn_hwperf_op_cpu(struct sn_hwperf_op_info *op_info) +{ + u32 cpu; + u32 use_ipi; + int r = 0; + cpumask_t save_allowed; + + cpu = (op_info->a->arg & SN_HWPERF_ARG_CPU_MASK) >> 32; + use_ipi = op_info->a->arg & SN_HWPERF_ARG_USE_IPI_MASK; + op_info->a->arg &= SN_HWPERF_ARG_OBJID_MASK; + + if (cpu != SN_HWPERF_ARG_ANY_CPU) { + if (cpu >= num_online_cpus() || !cpu_online(cpu)) { + r = -EINVAL; + goto out; + } + } + + if (cpu == SN_HWPERF_ARG_ANY_CPU || cpu == get_cpu()) { + /* don't care, or already on correct cpu */ + sn_hwperf_call_sal(op_info); + } + else { + if (use_ipi) { + /* use an interprocessor interrupt to call SAL */ + smp_call_function_single(cpu, sn_hwperf_call_sal, + op_info, 1, 1); + } + else { + /* migrate the task before calling SAL */ + save_allowed = current->cpus_allowed; + set_cpus_allowed(current, cpumask_of_cpu(cpu)); + sn_hwperf_call_sal(op_info); + set_cpus_allowed(current, save_allowed); + } + } + r = op_info->ret; + +out: + return r; +} + +/* map SAL hwperf error code to system error code */ +static int sn_hwperf_map_err(int hwperf_err) +{ + int e; + + switch(hwperf_err) { + case SN_HWPERF_OP_OK: + e = 0; + break; + + case SN_HWPERF_OP_NOMEM: + e = -ENOMEM; + break; + + case SN_HWPERF_OP_NO_PERM: + e = -EPERM; + break; + + case SN_HWPERF_OP_IO_ERROR: + e = -EIO; + break; + + case SN_HWPERF_OP_BUSY: + case SN_HWPERF_OP_RECONFIGURE: + e = -EAGAIN; + break; + + case SN_HWPERF_OP_INVAL: + default: + e = -EINVAL; + break; + } + + return e; +} + +/* + * ioctl for "sn_hwperf" misc device + */ +static int +sn_hwperf_ioctl(struct inode *in, struct file *fp, u32 op, u64 arg) +{ + struct sn_hwperf_ioctl_args a; + struct cpuinfo_ia64 *cdata; + struct sn_hwperf_object_info *objs; + struct sn_hwperf_object_info *cpuobj; + struct sn_hwperf_op_info op_info; + void *p = NULL; + int nobj; + char slice; + int node; + int r; + int v0; + int i; + int j; + + unlock_kernel(); + + /* only user requests are allowed here */ + if ((op & SN_HWPERF_OP_MASK) < 10) { + r = -EINVAL; + goto error; + } + r = copy_from_user(&a, (const void __user *)arg, + sizeof(struct sn_hwperf_ioctl_args)); + if (r != 0) { + r = -EFAULT; + goto error; + } + + /* + * Allocate memory to hold a kernel copy of the user buffer. The + * buffer contents are either copied in or out (or both) of user + * space depending on the flags encoded in the requested operation. + */ + if (a.ptr) { + p = vmalloc(a.sz); + if (!p) { + r = -ENOMEM; + goto error; + } + } + + if (op & SN_HWPERF_OP_MEM_COPYIN) { + r = copy_from_user(p, (const void __user *)a.ptr, a.sz); + if (r != 0) { + r = -EFAULT; + goto error; + } + } + + switch (op) { + case SN_HWPERF_GET_CPU_INFO: + if (a.sz == sizeof(u64)) { + /* special case to get size needed */ + *(u64 *) p = (u64) num_online_cpus() * + sizeof(struct sn_hwperf_object_info); + } else + if (a.sz < num_online_cpus() * sizeof(struct sn_hwperf_object_info)) { + r = -ENOMEM; + goto error; + } else + if ((r = sn_hwperf_enum_objects(&nobj, &objs)) == 0) { + memset(p, 0, a.sz); + for (i = 0; i < nobj; i++) { + node = sn_hwperf_obj_to_cnode(objs + i); + for_each_online_cpu(j) { + if (node != cpu_to_node(j)) + continue; + cpuobj = (struct sn_hwperf_object_info *) p + j; + slice = 'a' + cpuid_to_slice(j); + cdata = cpu_data(j); + cpuobj->id = j; + snprintf(cpuobj->name, + sizeof(cpuobj->name), + "CPU %luMHz %s", + cdata->proc_freq / 1000000, + cdata->vendor); + snprintf(cpuobj->location, + sizeof(cpuobj->location), + "%s%c", objs[i].location, + slice); + } + } + + vfree(objs); + } + break; + + case SN_HWPERF_GET_NODE_NASID: + if (a.sz != sizeof(u64) || + (node = a.arg) < 0 || node >= numionodes) { + r = -EINVAL; + goto error; + } + *(u64 *)p = (u64)cnodeid_to_nasid(node); + break; + + case SN_HWPERF_GET_OBJ_NODE: + if (a.sz != sizeof(u64) || a.arg < 0) { + r = -EINVAL; + goto error; + } + if ((r = sn_hwperf_enum_objects(&nobj, &objs)) == 0) { + if (a.arg >= nobj) { + r = -EINVAL; + vfree(objs); + goto error; + } + if (objs[(i = a.arg)].id != a.arg) { + for (i = 0; i < nobj; i++) { + if (objs[i].id == a.arg) + break; + } + } + if (i == nobj) { + r = -EINVAL; + vfree(objs); + goto error; + } + *(u64 *)p = (u64)sn_hwperf_obj_to_cnode(objs + i); + vfree(objs); + } + break; + + case SN_HWPERF_GET_MMRS: + case SN_HWPERF_SET_MMRS: + case SN_HWPERF_OBJECT_DISTANCE: + op_info.p = p; + op_info.a = &a; + op_info.v0 = &v0; + op_info.op = op; + r = sn_hwperf_op_cpu(&op_info); + if (r) { + r = sn_hwperf_map_err(r); + goto error; + } + break; + + default: + /* all other ops are a direct SAL call */ + r = ia64_sn_hwperf_op(sn_hwperf_master_nasid, op, + a.arg, a.sz, (u64) p, 0, 0, &v0); + if (r) { + r = sn_hwperf_map_err(r); + goto error; + } + a.v0 = v0; + break; + } + + if (op & SN_HWPERF_OP_MEM_COPYOUT) { + r = copy_to_user((void __user *)a.ptr, p, a.sz); + if (r != 0) { + r = -EFAULT; + goto error; + } + } + +error: + vfree(p); + + lock_kernel(); + return r; +} + +static struct file_operations sn_hwperf_fops = { + .ioctl = sn_hwperf_ioctl, +}; + +static struct miscdevice sn_hwperf_dev = { + MISC_DYNAMIC_MINOR, + "sn_hwperf", + &sn_hwperf_fops +}; + +static int sn_hwperf_init(void) +{ + u64 v; + int salr; + int e = 0; + + /* single threaded, once-only initialization */ + down(&sn_hwperf_init_mutex); + if (sn_hwperf_salheap) { + up(&sn_hwperf_init_mutex); + return e; + } + + /* + * The PROM code needs a fixed reference node. For convenience the + * same node as the console I/O is used. + */ + sn_hwperf_master_nasid = (nasid_t) ia64_sn_get_console_nasid(); + + /* + * Request the needed size and install the PROM scratch area. + * The PROM keeps various tracking bits in this memory area. + */ + salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid, + (u64) SN_HWPERF_GET_HEAPSIZE, 0, + (u64) sizeof(u64), (u64) &v, 0, 0, NULL); + if (salr != SN_HWPERF_OP_OK) { + e = -EINVAL; + goto out; + } + + if ((sn_hwperf_salheap = vmalloc(v)) == NULL) { + e = -ENOMEM; + goto out; + } + salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid, + SN_HWPERF_INSTALL_HEAP, 0, v, + (u64) sn_hwperf_salheap, 0, 0, NULL); + if (salr != SN_HWPERF_OP_OK) { + e = -EINVAL; + goto out; + } + + salr = ia64_sn_hwperf_op(sn_hwperf_master_nasid, + SN_HWPERF_OBJECT_COUNT, 0, + sizeof(u64), (u64) &v, 0, 0, NULL); + if (salr != SN_HWPERF_OP_OK) { + e = -EINVAL; + goto out; + } + sn_hwperf_obj_cnt = (int)v; + +out: + if (e < 0 && sn_hwperf_salheap) { + vfree(sn_hwperf_salheap); + sn_hwperf_salheap = NULL; + sn_hwperf_obj_cnt = 0; + } + + if (!e) { + /* + * Register a dynamic misc device for ioctl. Platforms + * supporting hotplug will create /dev/sn_hwperf, else + * user can to look up the minor number in /proc/misc. + */ + if ((e = misc_register(&sn_hwperf_dev)) != 0) { + printk(KERN_ERR "sn_hwperf_init: misc register " + "for \"sn_hwperf\" failed, err %d\n", e); + } + } + + up(&sn_hwperf_init_mutex); + return e; +} + +int sn_topology_open(struct inode *inode, struct file *file) +{ + int e; + struct seq_file *seq; + struct sn_hwperf_object_info *objbuf; + int nobj; + + if ((e = sn_hwperf_enum_objects(&nobj, &objbuf)) == 0) { + e = seq_open(file, &sn_topology_seq_ops); + seq = file->private_data; + seq->private = objbuf; + } + + return e; +} + +int sn_topology_release(struct inode *inode, struct file *file) +{ + struct seq_file *seq = file->private_data; + + vfree(seq->private); + return seq_release(inode, file); +} |