| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Hypervisor supplied "24x7" performance counter support |
| * |
| * Author: Cody P Schafer <cody@linux.vnet.ibm.com> |
| * Copyright 2014 IBM Corporation. |
| */ |
| |
| #define pr_fmt(fmt) "hv-24x7: " fmt |
| |
| #include <linux/perf_event.h> |
| #include <linux/rbtree.h> |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/vmalloc.h> |
| |
| #include <asm/cputhreads.h> |
| #include <asm/firmware.h> |
| #include <asm/hvcall.h> |
| #include <asm/io.h> |
| #include <linux/byteorder/generic.h> |
| |
| #include <asm/rtas.h> |
| #include "hv-24x7.h" |
| #include "hv-24x7-catalog.h" |
| #include "hv-common.h" |
| |
| /* Version of the 24x7 hypervisor API that we should use in this machine. */ |
| static int interface_version; |
| |
| /* Whether we have to aggregate result data for some domains. */ |
| static bool aggregate_result_elements; |
| |
| static cpumask_t hv_24x7_cpumask; |
| |
| static bool domain_is_valid(unsigned int domain) |
| { |
| switch (domain) { |
| #define DOMAIN(n, v, x, c) \ |
| case HV_PERF_DOMAIN_##n: \ |
| /* fall through */ |
| #include "hv-24x7-domains.h" |
| #undef DOMAIN |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| static bool is_physical_domain(unsigned int domain) |
| { |
| switch (domain) { |
| #define DOMAIN(n, v, x, c) \ |
| case HV_PERF_DOMAIN_##n: \ |
| return c; |
| #include "hv-24x7-domains.h" |
| #undef DOMAIN |
| default: |
| return false; |
| } |
| } |
| |
| /* |
| * The Processor Module Information system parameter allows transferring |
| * of certain processor module information from the platform to the OS. |
| * Refer PAPR+ document to get parameter token value as '43'. |
| */ |
| |
| #define PROCESSOR_MODULE_INFO 43 |
| |
| static u32 phys_sockets; /* Physical sockets */ |
| static u32 phys_chipspersocket; /* Physical chips per socket*/ |
| static u32 phys_coresperchip; /* Physical cores per chip */ |
| |
| /* |
| * read_24x7_sys_info() |
| * Retrieve the number of sockets and chips per socket and cores per |
| * chip details through the get-system-parameter rtas call. |
| */ |
| void read_24x7_sys_info(void) |
| { |
| int call_status, len, ntypes; |
| |
| spin_lock(&rtas_data_buf_lock); |
| |
| /* |
| * Making system parameter: chips and sockets and cores per chip |
| * default to 1. |
| */ |
| phys_sockets = 1; |
| phys_chipspersocket = 1; |
| phys_coresperchip = 1; |
| |
| call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1, |
| NULL, |
| PROCESSOR_MODULE_INFO, |
| __pa(rtas_data_buf), |
| RTAS_DATA_BUF_SIZE); |
| |
| if (call_status != 0) { |
| pr_err("Error calling get-system-parameter %d\n", |
| call_status); |
| } else { |
| len = be16_to_cpup((__be16 *)&rtas_data_buf[0]); |
| if (len < 8) |
| goto out; |
| |
| ntypes = be16_to_cpup((__be16 *)&rtas_data_buf[2]); |
| |
| if (!ntypes) |
| goto out; |
| |
| phys_sockets = be16_to_cpup((__be16 *)&rtas_data_buf[4]); |
| phys_chipspersocket = be16_to_cpup((__be16 *)&rtas_data_buf[6]); |
| phys_coresperchip = be16_to_cpup((__be16 *)&rtas_data_buf[8]); |
| } |
| |
| out: |
| spin_unlock(&rtas_data_buf_lock); |
| } |
| |
| /* Domains for which more than one result element are returned for each event. */ |
| static bool domain_needs_aggregation(unsigned int domain) |
| { |
| return aggregate_result_elements && |
| (domain == HV_PERF_DOMAIN_PHYS_CORE || |
| (domain >= HV_PERF_DOMAIN_VCPU_HOME_CORE && |
| domain <= HV_PERF_DOMAIN_VCPU_REMOTE_NODE)); |
| } |
| |
| static const char *domain_name(unsigned int domain) |
| { |
| if (!domain_is_valid(domain)) |
| return NULL; |
| |
| switch (domain) { |
| case HV_PERF_DOMAIN_PHYS_CHIP: return "Physical Chip"; |
| case HV_PERF_DOMAIN_PHYS_CORE: return "Physical Core"; |
| case HV_PERF_DOMAIN_VCPU_HOME_CORE: return "VCPU Home Core"; |
| case HV_PERF_DOMAIN_VCPU_HOME_CHIP: return "VCPU Home Chip"; |
| case HV_PERF_DOMAIN_VCPU_HOME_NODE: return "VCPU Home Node"; |
| case HV_PERF_DOMAIN_VCPU_REMOTE_NODE: return "VCPU Remote Node"; |
| } |
| |
| WARN_ON_ONCE(domain); |
| return NULL; |
| } |
| |
| static bool catalog_entry_domain_is_valid(unsigned int domain) |
| { |
| /* POWER8 doesn't support virtual domains. */ |
| if (interface_version == 1) |
| return is_physical_domain(domain); |
| else |
| return domain_is_valid(domain); |
| } |
| |
| /* |
| * TODO: Merging events: |
| * - Think of the hcall as an interface to a 4d array of counters: |
| * - x = domains |
| * - y = indexes in the domain (core, chip, vcpu, node, etc) |
| * - z = offset into the counter space |
| * - w = lpars (guest vms, "logical partitions") |
| * - A single request is: x,y,y_last,z,z_last,w,w_last |
| * - this means we can retrieve a rectangle of counters in y,z for a single x. |
| * |
| * - Things to consider (ignoring w): |
| * - input cost_per_request = 16 |
| * - output cost_per_result(ys,zs) = 8 + 8 * ys + ys * zs |
| * - limited number of requests per hcall (must fit into 4K bytes) |
| * - 4k = 16 [buffer header] - 16 [request size] * request_count |
| * - 255 requests per hcall |
| * - sometimes it will be more efficient to read extra data and discard |
| */ |
| |
| /* |
| * Example usage: |
| * perf stat -e 'hv_24x7/domain=2,offset=8,vcpu=0,lpar=0xffffffff/' |
| */ |
| |
| /* u3 0-6, one of HV_24X7_PERF_DOMAIN */ |
| EVENT_DEFINE_RANGE_FORMAT(domain, config, 0, 3); |
| /* u16 */ |
| EVENT_DEFINE_RANGE_FORMAT(core, config, 16, 31); |
| EVENT_DEFINE_RANGE_FORMAT(chip, config, 16, 31); |
| EVENT_DEFINE_RANGE_FORMAT(vcpu, config, 16, 31); |
| /* u32, see "data_offset" */ |
| EVENT_DEFINE_RANGE_FORMAT(offset, config, 32, 63); |
| /* u16 */ |
| EVENT_DEFINE_RANGE_FORMAT(lpar, config1, 0, 15); |
| |
| EVENT_DEFINE_RANGE(reserved1, config, 4, 15); |
| EVENT_DEFINE_RANGE(reserved2, config1, 16, 63); |
| EVENT_DEFINE_RANGE(reserved3, config2, 0, 63); |
| |
| static struct attribute *format_attrs[] = { |
| &format_attr_domain.attr, |
| &format_attr_offset.attr, |
| &format_attr_core.attr, |
| &format_attr_chip.attr, |
| &format_attr_vcpu.attr, |
| &format_attr_lpar.attr, |
| NULL, |
| }; |
| |
| static const struct attribute_group format_group = { |
| .name = "format", |
| .attrs = format_attrs, |
| }; |
| |
| static struct attribute_group event_group = { |
| .name = "events", |
| /* .attrs is set in init */ |
| }; |
| |
| static struct attribute_group event_desc_group = { |
| .name = "event_descs", |
| /* .attrs is set in init */ |
| }; |
| |
| static struct attribute_group event_long_desc_group = { |
| .name = "event_long_descs", |
| /* .attrs is set in init */ |
| }; |
| |
| static struct kmem_cache *hv_page_cache; |
| |
| static DEFINE_PER_CPU(int, hv_24x7_txn_flags); |
| static DEFINE_PER_CPU(int, hv_24x7_txn_err); |
| |
| struct hv_24x7_hw { |
| struct perf_event *events[255]; |
| }; |
| |
| static DEFINE_PER_CPU(struct hv_24x7_hw, hv_24x7_hw); |
| |
| /* |
| * request_buffer and result_buffer are not required to be 4k aligned, |
| * but are not allowed to cross any 4k boundary. Aligning them to 4k is |
| * the simplest way to ensure that. |
| */ |
| #define H24x7_DATA_BUFFER_SIZE 4096 |
| static DEFINE_PER_CPU(char, hv_24x7_reqb[H24x7_DATA_BUFFER_SIZE]) __aligned(4096); |
| static DEFINE_PER_CPU(char, hv_24x7_resb[H24x7_DATA_BUFFER_SIZE]) __aligned(4096); |
| |
| static unsigned int max_num_requests(int interface_version) |
| { |
| return (H24x7_DATA_BUFFER_SIZE - sizeof(struct hv_24x7_request_buffer)) |
| / H24x7_REQUEST_SIZE(interface_version); |
| } |
| |
| static char *event_name(struct hv_24x7_event_data *ev, int *len) |
| { |
| *len = be16_to_cpu(ev->event_name_len) - 2; |
| return (char *)ev->remainder; |
| } |
| |
| static char *event_desc(struct hv_24x7_event_data *ev, int *len) |
| { |
| unsigned int nl = be16_to_cpu(ev->event_name_len); |
| __be16 *desc_len = (__be16 *)(ev->remainder + nl - 2); |
| |
| *len = be16_to_cpu(*desc_len) - 2; |
| return (char *)ev->remainder + nl; |
| } |
| |
| static char *event_long_desc(struct hv_24x7_event_data *ev, int *len) |
| { |
| unsigned int nl = be16_to_cpu(ev->event_name_len); |
| __be16 *desc_len_ = (__be16 *)(ev->remainder + nl - 2); |
| unsigned int desc_len = be16_to_cpu(*desc_len_); |
| __be16 *long_desc_len = (__be16 *)(ev->remainder + nl + desc_len - 2); |
| |
| *len = be16_to_cpu(*long_desc_len) - 2; |
| return (char *)ev->remainder + nl + desc_len; |
| } |
| |
| static bool event_fixed_portion_is_within(struct hv_24x7_event_data *ev, |
| void *end) |
| { |
| void *start = ev; |
| |
| return (start + offsetof(struct hv_24x7_event_data, remainder)) < end; |
| } |
| |
| /* |
| * Things we don't check: |
| * - padding for desc, name, and long/detailed desc is required to be '\0' |
| * bytes. |
| * |
| * Return NULL if we pass end, |
| * Otherwise return the address of the byte just following the event. |
| */ |
| static void *event_end(struct hv_24x7_event_data *ev, void *end) |
| { |
| void *start = ev; |
| __be16 *dl_, *ldl_; |
| unsigned int dl, ldl; |
| unsigned int nl = be16_to_cpu(ev->event_name_len); |
| |
| if (nl < 2) { |
| pr_debug("%s: name length too short: %d", __func__, nl); |
| return NULL; |
| } |
| |
| if (start + nl > end) { |
| pr_debug("%s: start=%p + nl=%u > end=%p", |
| __func__, start, nl, end); |
| return NULL; |
| } |
| |
| dl_ = (__be16 *)(ev->remainder + nl - 2); |
| if (!IS_ALIGNED((uintptr_t)dl_, 2)) |
| pr_warn("desc len not aligned %p", dl_); |
| dl = be16_to_cpu(*dl_); |
| if (dl < 2) { |
| pr_debug("%s: desc len too short: %d", __func__, dl); |
| return NULL; |
| } |
| |
| if (start + nl + dl > end) { |
| pr_debug("%s: (start=%p + nl=%u + dl=%u)=%p > end=%p", |
| __func__, start, nl, dl, start + nl + dl, end); |
| return NULL; |
| } |
| |
| ldl_ = (__be16 *)(ev->remainder + nl + dl - 2); |
| if (!IS_ALIGNED((uintptr_t)ldl_, 2)) |
| pr_warn("long desc len not aligned %p", ldl_); |
| ldl = be16_to_cpu(*ldl_); |
| if (ldl < 2) { |
| pr_debug("%s: long desc len too short (ldl=%u)", |
| __func__, ldl); |
| return NULL; |
| } |
| |
| if (start + nl + dl + ldl > end) { |
| pr_debug("%s: start=%p + nl=%u + dl=%u + ldl=%u > end=%p", |
| __func__, start, nl, dl, ldl, end); |
| return NULL; |
| } |
| |
| return start + nl + dl + ldl; |
| } |
| |
| static long h_get_24x7_catalog_page_(unsigned long phys_4096, |
| unsigned long version, unsigned long index) |
| { |
| pr_devel("h_get_24x7_catalog_page(0x%lx, %lu, %lu)", |
| phys_4096, version, index); |
| |
| WARN_ON(!IS_ALIGNED(phys_4096, 4096)); |
| |
| return plpar_hcall_norets(H_GET_24X7_CATALOG_PAGE, |
| phys_4096, version, index); |
| } |
| |
| static long h_get_24x7_catalog_page(char page[], u64 version, u32 index) |
| { |
| return h_get_24x7_catalog_page_(virt_to_phys(page), |
| version, index); |
| } |
| |
| /* |
| * Each event we find in the catalog, will have a sysfs entry. Format the |
| * data for this sysfs entry based on the event's domain. |
| * |
| * Events belonging to the Chip domain can only be monitored in that domain. |
| * i.e the domain for these events is a fixed/knwon value. |
| * |
| * Events belonging to the Core domain can be monitored either in the physical |
| * core or in one of the virtual CPU domains. So the domain value for these |
| * events must be specified by the user (i.e is a required parameter). Format |
| * the Core events with 'domain=?' so the perf-tool can error check required |
| * parameters. |
| * |
| * NOTE: For the Core domain events, rather than making domain a required |
| * parameter we could default it to PHYS_CORE and allowe users to |
| * override the domain to one of the VCPU domains. |
| * |
| * However, this can make the interface a little inconsistent. |
| * |
| * If we set domain=2 (PHYS_CHIP) and allow user to override this field |
| * the user may be tempted to also modify the "offset=x" field in which |
| * can lead to confusing usage. Consider the HPM_PCYC (offset=0x18) and |
| * HPM_INST (offset=0x20) events. With: |
| * |
| * perf stat -e hv_24x7/HPM_PCYC,offset=0x20/ |
| * |
| * we end up monitoring HPM_INST, while the command line has HPM_PCYC. |
| * |
| * By not assigning a default value to the domain for the Core events, |
| * we can have simple guidelines: |
| * |
| * - Specifying values for parameters with "=?" is required. |
| * |
| * - Specifying (i.e overriding) values for other parameters |
| * is undefined. |
| */ |
| static char *event_fmt(struct hv_24x7_event_data *event, unsigned int domain) |
| { |
| const char *sindex; |
| const char *lpar; |
| const char *domain_str; |
| char buf[8]; |
| |
| switch (domain) { |
| case HV_PERF_DOMAIN_PHYS_CHIP: |
| snprintf(buf, sizeof(buf), "%d", domain); |
| domain_str = buf; |
| lpar = "0x0"; |
| sindex = "chip"; |
| break; |
| case HV_PERF_DOMAIN_PHYS_CORE: |
| domain_str = "?"; |
| lpar = "0x0"; |
| sindex = "core"; |
| break; |
| default: |
| domain_str = "?"; |
| lpar = "?"; |
| sindex = "vcpu"; |
| } |
| |
| return kasprintf(GFP_KERNEL, |
| "domain=%s,offset=0x%x,%s=?,lpar=%s", |
| domain_str, |
| be16_to_cpu(event->event_counter_offs) + |
| be16_to_cpu(event->event_group_record_offs), |
| sindex, |
| lpar); |
| } |
| |
| /* Avoid trusting fw to NUL terminate strings */ |
| static char *memdup_to_str(char *maybe_str, int max_len, gfp_t gfp) |
| { |
| return kasprintf(gfp, "%.*s", max_len, maybe_str); |
| } |
| |
| static ssize_t device_show_string(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct dev_ext_attribute *d; |
| |
| d = container_of(attr, struct dev_ext_attribute, attr); |
| |
| return sprintf(buf, "%s\n", (char *)d->var); |
| } |
| |
| static ssize_t cpumask_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| return cpumap_print_to_pagebuf(true, buf, &hv_24x7_cpumask); |
| } |
| |
| static ssize_t sockets_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| return sprintf(buf, "%d\n", phys_sockets); |
| } |
| |
| static ssize_t chipspersocket_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| return sprintf(buf, "%d\n", phys_chipspersocket); |
| } |
| |
| static ssize_t coresperchip_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| return sprintf(buf, "%d\n", phys_coresperchip); |
| } |
| |
| static struct attribute *device_str_attr_create_(char *name, char *str) |
| { |
| struct dev_ext_attribute *attr = kzalloc(sizeof(*attr), GFP_KERNEL); |
| |
| if (!attr) |
| return NULL; |
| |
| sysfs_attr_init(&attr->attr.attr); |
| |
| attr->var = str; |
| attr->attr.attr.name = name; |
| attr->attr.attr.mode = 0444; |
| attr->attr.show = device_show_string; |
| |
| return &attr->attr.attr; |
| } |
| |
| /* |
| * Allocate and initialize strings representing event attributes. |
| * |
| * NOTE: The strings allocated here are never destroyed and continue to |
| * exist till shutdown. This is to allow us to create as many events |
| * from the catalog as possible, even if we encounter errors with some. |
| * In case of changes to error paths in future, these may need to be |
| * freed by the caller. |
| */ |
| static struct attribute *device_str_attr_create(char *name, int name_max, |
| int name_nonce, |
| char *str, size_t str_max) |
| { |
| char *n; |
| char *s = memdup_to_str(str, str_max, GFP_KERNEL); |
| struct attribute *a; |
| |
| if (!s) |
| return NULL; |
| |
| if (!name_nonce) |
| n = kasprintf(GFP_KERNEL, "%.*s", name_max, name); |
| else |
| n = kasprintf(GFP_KERNEL, "%.*s__%d", name_max, name, |
| name_nonce); |
| if (!n) |
| goto out_s; |
| |
| a = device_str_attr_create_(n, s); |
| if (!a) |
| goto out_n; |
| |
| return a; |
| out_n: |
| kfree(n); |
| out_s: |
| kfree(s); |
| return NULL; |
| } |
| |
| static struct attribute *event_to_attr(unsigned int ix, |
| struct hv_24x7_event_data *event, |
| unsigned int domain, |
| int nonce) |
| { |
| int event_name_len; |
| char *ev_name, *a_ev_name, *val; |
| struct attribute *attr; |
| |
| if (!domain_is_valid(domain)) { |
| pr_warn("catalog event %u has invalid domain %u\n", |
| ix, domain); |
| return NULL; |
| } |
| |
| val = event_fmt(event, domain); |
| if (!val) |
| return NULL; |
| |
| ev_name = event_name(event, &event_name_len); |
| if (!nonce) |
| a_ev_name = kasprintf(GFP_KERNEL, "%.*s", |
| (int)event_name_len, ev_name); |
| else |
| a_ev_name = kasprintf(GFP_KERNEL, "%.*s__%d", |
| (int)event_name_len, ev_name, nonce); |
| |
| if (!a_ev_name) |
| goto out_val; |
| |
| attr = device_str_attr_create_(a_ev_name, val); |
| if (!attr) |
| goto out_name; |
| |
| return attr; |
| out_name: |
| kfree(a_ev_name); |
| out_val: |
| kfree(val); |
| return NULL; |
| } |
| |
| static struct attribute *event_to_desc_attr(struct hv_24x7_event_data *event, |
| int nonce) |
| { |
| int nl, dl; |
| char *name = event_name(event, &nl); |
| char *desc = event_desc(event, &dl); |
| |
| /* If there isn't a description, don't create the sysfs file */ |
| if (!dl) |
| return NULL; |
| |
| return device_str_attr_create(name, nl, nonce, desc, dl); |
| } |
| |
| static struct attribute * |
| event_to_long_desc_attr(struct hv_24x7_event_data *event, int nonce) |
| { |
| int nl, dl; |
| char *name = event_name(event, &nl); |
| char *desc = event_long_desc(event, &dl); |
| |
| /* If there isn't a description, don't create the sysfs file */ |
| if (!dl) |
| return NULL; |
| |
| return device_str_attr_create(name, nl, nonce, desc, dl); |
| } |
| |
| static int event_data_to_attrs(unsigned int ix, struct attribute **attrs, |
| struct hv_24x7_event_data *event, int nonce) |
| { |
| *attrs = event_to_attr(ix, event, event->domain, nonce); |
| if (!*attrs) |
| return -1; |
| |
| return 0; |
| } |
| |
| /* */ |
| struct event_uniq { |
| struct rb_node node; |
| const char *name; |
| int nl; |
| unsigned int ct; |
| unsigned int domain; |
| }; |
| |
| static int memord(const void *d1, size_t s1, const void *d2, size_t s2) |
| { |
| if (s1 < s2) |
| return 1; |
| if (s1 > s2) |
| return -1; |
| |
| return memcmp(d1, d2, s1); |
| } |
| |
| static int ev_uniq_ord(const void *v1, size_t s1, unsigned int d1, |
| const void *v2, size_t s2, unsigned int d2) |
| { |
| int r = memord(v1, s1, v2, s2); |
| |
| if (r) |
| return r; |
| if (d1 > d2) |
| return 1; |
| if (d2 > d1) |
| return -1; |
| return 0; |
| } |
| |
| static int event_uniq_add(struct rb_root *root, const char *name, int nl, |
| unsigned int domain) |
| { |
| struct rb_node **new = &(root->rb_node), *parent = NULL; |
| struct event_uniq *data; |
| |
| /* Figure out where to put new node */ |
| while (*new) { |
| struct event_uniq *it; |
| int result; |
| |
| it = rb_entry(*new, struct event_uniq, node); |
| result = ev_uniq_ord(name, nl, domain, it->name, it->nl, |
| it->domain); |
| |
| parent = *new; |
| if (result < 0) |
| new = &((*new)->rb_left); |
| else if (result > 0) |
| new = &((*new)->rb_right); |
| else { |
| it->ct++; |
| pr_info("found a duplicate event %.*s, ct=%u\n", nl, |
| name, it->ct); |
| return it->ct; |
| } |
| } |
| |
| data = kmalloc(sizeof(*data), GFP_KERNEL); |
| if (!data) |
| return -ENOMEM; |
| |
| *data = (struct event_uniq) { |
| .name = name, |
| .nl = nl, |
| .ct = 0, |
| .domain = domain, |
| }; |
| |
| /* Add new node and rebalance tree. */ |
| rb_link_node(&data->node, parent, new); |
| rb_insert_color(&data->node, root); |
| |
| /* data->ct */ |
| return 0; |
| } |
| |
| static void event_uniq_destroy(struct rb_root *root) |
| { |
| /* |
| * the strings we point to are in the giant block of memory filled by |
| * the catalog, and are freed separately. |
| */ |
| struct event_uniq *pos, *n; |
| |
| rbtree_postorder_for_each_entry_safe(pos, n, root, node) |
| kfree(pos); |
| } |
| |
| |
| /* |
| * ensure the event structure's sizes are self consistent and don't cause us to |
| * read outside of the event |
| * |
| * On success, return the event length in bytes. |
| * Otherwise, return -1 (and print as appropriate). |
| */ |
| static ssize_t catalog_event_len_validate(struct hv_24x7_event_data *event, |
| size_t event_idx, |
| size_t event_data_bytes, |
| size_t event_entry_count, |
| size_t offset, void *end) |
| { |
| ssize_t ev_len; |
| void *ev_end, *calc_ev_end; |
| |
| if (offset >= event_data_bytes) |
| return -1; |
| |
| if (event_idx >= event_entry_count) { |
| pr_devel("catalog event data has %zu bytes of padding after last event\n", |
| event_data_bytes - offset); |
| return -1; |
| } |
| |
| if (!event_fixed_portion_is_within(event, end)) { |
| pr_warn("event %zu fixed portion is not within range\n", |
| event_idx); |
| return -1; |
| } |
| |
| ev_len = be16_to_cpu(event->length); |
| |
| if (ev_len % 16) |
| pr_info("event %zu has length %zu not divisible by 16: event=%pK\n", |
| event_idx, ev_len, event); |
| |
| ev_end = (__u8 *)event + ev_len; |
| if (ev_end > end) { |
| pr_warn("event %zu has .length=%zu, ends after buffer end: ev_end=%pK > end=%pK, offset=%zu\n", |
| event_idx, ev_len, ev_end, end, |
| offset); |
| return -1; |
| } |
| |
| calc_ev_end = event_end(event, end); |
| if (!calc_ev_end) { |
| pr_warn("event %zu has a calculated length which exceeds buffer length %zu: event=%pK end=%pK, offset=%zu\n", |
| event_idx, event_data_bytes, event, end, |
| offset); |
| return -1; |
| } |
| |
| if (calc_ev_end > ev_end) { |
| pr_warn("event %zu exceeds its own length: event=%pK, end=%pK, offset=%zu, calc_ev_end=%pK\n", |
| event_idx, event, ev_end, offset, calc_ev_end); |
| return -1; |
| } |
| |
| return ev_len; |
| } |
| |
| /* |
| * Return true incase of invalid or dummy events with names like RESERVED* |
| */ |
| static bool ignore_event(const char *name) |
| { |
| return strncmp(name, "RESERVED", 8) == 0; |
| } |
| |
| #define MAX_4K (SIZE_MAX / 4096) |
| |
| static int create_events_from_catalog(struct attribute ***events_, |
| struct attribute ***event_descs_, |
| struct attribute ***event_long_descs_) |
| { |
| long hret; |
| size_t catalog_len, catalog_page_len, event_entry_count, |
| event_data_len, event_data_offs, |
| event_data_bytes, junk_events, event_idx, event_attr_ct, i, |
| attr_max, event_idx_last, desc_ct, long_desc_ct; |
| ssize_t ct, ev_len; |
| uint64_t catalog_version_num; |
| struct attribute **events, **event_descs, **event_long_descs; |
| struct hv_24x7_catalog_page_0 *page_0 = |
| kmem_cache_alloc(hv_page_cache, GFP_KERNEL); |
| void *page = page_0; |
| void *event_data, *end; |
| struct hv_24x7_event_data *event; |
| struct rb_root ev_uniq = RB_ROOT; |
| int ret = 0; |
| |
| if (!page) { |
| ret = -ENOMEM; |
| goto e_out; |
| } |
| |
| hret = h_get_24x7_catalog_page(page, 0, 0); |
| if (hret) { |
| ret = -EIO; |
| goto e_free; |
| } |
| |
| catalog_version_num = be64_to_cpu(page_0->version); |
| catalog_page_len = be32_to_cpu(page_0->length); |
| |
| if (MAX_4K < catalog_page_len) { |
| pr_err("invalid page count: %zu\n", catalog_page_len); |
| ret = -EIO; |
| goto e_free; |
| } |
| |
| catalog_len = catalog_page_len * 4096; |
| |
| event_entry_count = be16_to_cpu(page_0->event_entry_count); |
| event_data_offs = be16_to_cpu(page_0->event_data_offs); |
| event_data_len = be16_to_cpu(page_0->event_data_len); |
| |
| pr_devel("cv %llu cl %zu eec %zu edo %zu edl %zu\n", |
| catalog_version_num, catalog_len, |
| event_entry_count, event_data_offs, event_data_len); |
| |
| if ((MAX_4K < event_data_len) |
| || (MAX_4K < event_data_offs) |
| || (MAX_4K - event_data_offs < event_data_len)) { |
| pr_err("invalid event data offs %zu and/or len %zu\n", |
| event_data_offs, event_data_len); |
| ret = -EIO; |
| goto e_free; |
| } |
| |
| if ((event_data_offs + event_data_len) > catalog_page_len) { |
| pr_err("event data %zu-%zu does not fit inside catalog 0-%zu\n", |
| event_data_offs, |
| event_data_offs + event_data_len, |
| catalog_page_len); |
| ret = -EIO; |
| goto e_free; |
| } |
| |
| if (SIZE_MAX - 1 < event_entry_count) { |
| pr_err("event_entry_count %zu is invalid\n", event_entry_count); |
| ret = -EIO; |
| goto e_free; |
| } |
| |
| event_data_bytes = event_data_len * 4096; |
| |
| /* |
| * event data can span several pages, events can cross between these |
| * pages. Use vmalloc to make this easier. |
| */ |
| event_data = vmalloc(event_data_bytes); |
| if (!event_data) { |
| pr_err("could not allocate event data\n"); |
| ret = -ENOMEM; |
| goto e_free; |
| } |
| |
| end = event_data + event_data_bytes; |
| |
| /* |
| * using vmalloc_to_phys() like this only works if PAGE_SIZE is |
| * divisible by 4096 |
| */ |
| BUILD_BUG_ON(PAGE_SIZE % 4096); |
| |
| for (i = 0; i < event_data_len; i++) { |
| hret = h_get_24x7_catalog_page_( |
| vmalloc_to_phys(event_data + i * 4096), |
| catalog_version_num, |
| i + event_data_offs); |
| if (hret) { |
| pr_err("Failed to get event data in page %zu: rc=%ld\n", |
| i + event_data_offs, hret); |
| ret = -EIO; |
| goto e_event_data; |
| } |
| } |
| |
| /* |
| * scan the catalog to determine the number of attributes we need, and |
| * verify it at the same time. |
| */ |
| for (junk_events = 0, event = event_data, event_idx = 0, attr_max = 0; |
| ; |
| event_idx++, event = (void *)event + ev_len) { |
| size_t offset = (void *)event - (void *)event_data; |
| char *name; |
| int nl; |
| |
| ev_len = catalog_event_len_validate(event, event_idx, |
| event_data_bytes, |
| event_entry_count, |
| offset, end); |
| if (ev_len < 0) |
| break; |
| |
| name = event_name(event, &nl); |
| |
| if (ignore_event(name)) { |
| junk_events++; |
| continue; |
| } |
| if (event->event_group_record_len == 0) { |
| pr_devel("invalid event %zu (%.*s): group_record_len == 0, skipping\n", |
| event_idx, nl, name); |
| junk_events++; |
| continue; |
| } |
| |
| if (!catalog_entry_domain_is_valid(event->domain)) { |
| pr_info("event %zu (%.*s) has invalid domain %d\n", |
| event_idx, nl, name, event->domain); |
| junk_events++; |
| continue; |
| } |
| |
| attr_max++; |
| } |
| |
| event_idx_last = event_idx; |
| if (event_idx_last != event_entry_count) |
| pr_warn("event buffer ended before listed # of events were parsed (got %zu, wanted %zu, junk %zu)\n", |
| event_idx_last, event_entry_count, junk_events); |
| |
| events = kmalloc_array(attr_max + 1, sizeof(*events), GFP_KERNEL); |
| if (!events) { |
| ret = -ENOMEM; |
| goto e_event_data; |
| } |
| |
| event_descs = kmalloc_array(event_idx + 1, sizeof(*event_descs), |
| GFP_KERNEL); |
| if (!event_descs) { |
| ret = -ENOMEM; |
| goto e_event_attrs; |
| } |
| |
| event_long_descs = kmalloc_array(event_idx + 1, |
| sizeof(*event_long_descs), GFP_KERNEL); |
| if (!event_long_descs) { |
| ret = -ENOMEM; |
| goto e_event_descs; |
| } |
| |
| /* Iterate over the catalog filling in the attribute vector */ |
| for (junk_events = 0, event_attr_ct = 0, desc_ct = 0, long_desc_ct = 0, |
| event = event_data, event_idx = 0; |
| event_idx < event_idx_last; |
| event_idx++, ev_len = be16_to_cpu(event->length), |
| event = (void *)event + ev_len) { |
| char *name; |
| int nl; |
| int nonce; |
| /* |
| * these are the only "bad" events that are intermixed and that |
| * we can ignore without issue. make sure to skip them here |
| */ |
| if (event->event_group_record_len == 0) |
| continue; |
| if (!catalog_entry_domain_is_valid(event->domain)) |
| continue; |
| |
| name = event_name(event, &nl); |
| if (ignore_event(name)) |
| continue; |
| |
| nonce = event_uniq_add(&ev_uniq, name, nl, event->domain); |
| ct = event_data_to_attrs(event_idx, events + event_attr_ct, |
| event, nonce); |
| if (ct < 0) { |
| pr_warn("event %zu (%.*s) creation failure, skipping\n", |
| event_idx, nl, name); |
| junk_events++; |
| } else { |
| event_attr_ct++; |
| event_descs[desc_ct] = event_to_desc_attr(event, nonce); |
| if (event_descs[desc_ct]) |
| desc_ct++; |
| event_long_descs[long_desc_ct] = |
| event_to_long_desc_attr(event, nonce); |
| if (event_long_descs[long_desc_ct]) |
| long_desc_ct++; |
| } |
| } |
| |
| pr_info("read %zu catalog entries, created %zu event attrs (%zu failures), %zu descs\n", |
| event_idx, event_attr_ct, junk_events, desc_ct); |
| |
| events[event_attr_ct] = NULL; |
| event_descs[desc_ct] = NULL; |
| event_long_descs[long_desc_ct] = NULL; |
| |
| event_uniq_destroy(&ev_uniq); |
| vfree(event_data); |
| kmem_cache_free(hv_page_cache, page); |
| |
| *events_ = events; |
| *event_descs_ = event_descs; |
| *event_long_descs_ = event_long_descs; |
| return 0; |
| |
| e_event_descs: |
| kfree(event_descs); |
| e_event_attrs: |
| kfree(events); |
| e_event_data: |
| vfree(event_data); |
| e_free: |
| kmem_cache_free(hv_page_cache, page); |
| e_out: |
| *events_ = NULL; |
| *event_descs_ = NULL; |
| *event_long_descs_ = NULL; |
| return ret; |
| } |
| |
| static ssize_t catalog_read(struct file *filp, struct kobject *kobj, |
| struct bin_attribute *bin_attr, char *buf, |
| loff_t offset, size_t count) |
| { |
| long hret; |
| ssize_t ret = 0; |
| size_t catalog_len = 0, catalog_page_len = 0; |
| loff_t page_offset = 0; |
| loff_t offset_in_page; |
| size_t copy_len; |
| uint64_t catalog_version_num = 0; |
| void *page = kmem_cache_alloc(hv_page_cache, GFP_USER); |
| struct hv_24x7_catalog_page_0 *page_0 = page; |
| |
| if (!page) |
| return -ENOMEM; |
| |
| hret = h_get_24x7_catalog_page(page, 0, 0); |
| if (hret) { |
| ret = -EIO; |
| goto e_free; |
| } |
| |
| catalog_version_num = be64_to_cpu(page_0->version); |
| catalog_page_len = be32_to_cpu(page_0->length); |
| catalog_len = catalog_page_len * 4096; |
| |
| page_offset = offset / 4096; |
| offset_in_page = offset % 4096; |
| |
| if (page_offset >= catalog_page_len) |
| goto e_free; |
| |
| if (page_offset != 0) { |
| hret = h_get_24x7_catalog_page(page, catalog_version_num, |
| page_offset); |
| if (hret) { |
| ret = -EIO; |
| goto e_free; |
| } |
| } |
| |
| copy_len = 4096 - offset_in_page; |
| if (copy_len > count) |
| copy_len = count; |
| |
| memcpy(buf, page+offset_in_page, copy_len); |
| ret = copy_len; |
| |
| e_free: |
| if (hret) |
| pr_err("h_get_24x7_catalog_page(ver=%lld, page=%lld) failed:" |
| " rc=%ld\n", |
| catalog_version_num, page_offset, hret); |
| kmem_cache_free(hv_page_cache, page); |
| |
| pr_devel("catalog_read: offset=%lld(%lld) count=%zu " |
| "catalog_len=%zu(%zu) => %zd\n", offset, page_offset, |
| count, catalog_len, catalog_page_len, ret); |
| |
| return ret; |
| } |
| |
| static ssize_t domains_show(struct device *dev, struct device_attribute *attr, |
| char *page) |
| { |
| int d, n, count = 0; |
| const char *str; |
| |
| for (d = 0; d < HV_PERF_DOMAIN_MAX; d++) { |
| str = domain_name(d); |
| if (!str) |
| continue; |
| |
| n = sprintf(page, "%d: %s\n", d, str); |
| if (n < 0) |
| break; |
| |
| count += n; |
| page += n; |
| } |
| return count; |
| } |
| |
| #define PAGE_0_ATTR(_name, _fmt, _expr) \ |
| static ssize_t _name##_show(struct device *dev, \ |
| struct device_attribute *dev_attr, \ |
| char *buf) \ |
| { \ |
| long hret; \ |
| ssize_t ret = 0; \ |
| void *page = kmem_cache_alloc(hv_page_cache, GFP_USER); \ |
| struct hv_24x7_catalog_page_0 *page_0 = page; \ |
| if (!page) \ |
| return -ENOMEM; \ |
| hret = h_get_24x7_catalog_page(page, 0, 0); \ |
| if (hret) { \ |
| ret = -EIO; \ |
| goto e_free; \ |
| } \ |
| ret = sprintf(buf, _fmt, _expr); \ |
| e_free: \ |
| kmem_cache_free(hv_page_cache, page); \ |
| return ret; \ |
| } \ |
| static DEVICE_ATTR_RO(_name) |
| |
| PAGE_0_ATTR(catalog_version, "%lld\n", |
| (unsigned long long)be64_to_cpu(page_0->version)); |
| PAGE_0_ATTR(catalog_len, "%lld\n", |
| (unsigned long long)be32_to_cpu(page_0->length) * 4096); |
| static BIN_ATTR_RO(catalog, 0/* real length varies */); |
| static DEVICE_ATTR_RO(domains); |
| static DEVICE_ATTR_RO(sockets); |
| static DEVICE_ATTR_RO(chipspersocket); |
| static DEVICE_ATTR_RO(coresperchip); |
| static DEVICE_ATTR_RO(cpumask); |
| |
| static struct bin_attribute *if_bin_attrs[] = { |
| &bin_attr_catalog, |
| NULL, |
| }; |
| |
| static struct attribute *cpumask_attrs[] = { |
| &dev_attr_cpumask.attr, |
| NULL, |
| }; |
| |
| static const struct attribute_group cpumask_attr_group = { |
| .attrs = cpumask_attrs, |
| }; |
| |
| static struct attribute *if_attrs[] = { |
| &dev_attr_catalog_len.attr, |
| &dev_attr_catalog_version.attr, |
| &dev_attr_domains.attr, |
| &dev_attr_sockets.attr, |
| &dev_attr_chipspersocket.attr, |
| &dev_attr_coresperchip.attr, |
| NULL, |
| }; |
| |
| static const struct attribute_group if_group = { |
| .name = "interface", |
| .bin_attrs = if_bin_attrs, |
| .attrs = if_attrs, |
| }; |
| |
| static const struct attribute_group *attr_groups[] = { |
| &format_group, |
| &event_group, |
| &event_desc_group, |
| &event_long_desc_group, |
| &if_group, |
| &cpumask_attr_group, |
| NULL, |
| }; |
| |
| /* |
| * Start the process for a new H_GET_24x7_DATA hcall. |
| */ |
| static void init_24x7_request(struct hv_24x7_request_buffer *request_buffer, |
| struct hv_24x7_data_result_buffer *result_buffer) |
| { |
| |
| memset(request_buffer, 0, H24x7_DATA_BUFFER_SIZE); |
| memset(result_buffer, 0, H24x7_DATA_BUFFER_SIZE); |
| |
| request_buffer->interface_version = interface_version; |
| /* memset above set request_buffer->num_requests to 0 */ |
| } |
| |
| /* |
| * Commit (i.e perform) the H_GET_24x7_DATA hcall using the data collected |
| * by 'init_24x7_request()' and 'add_event_to_24x7_request()'. |
| */ |
| static int make_24x7_request(struct hv_24x7_request_buffer *request_buffer, |
| struct hv_24x7_data_result_buffer *result_buffer) |
| { |
| long ret; |
| |
| /* |
| * NOTE: Due to variable number of array elements in request and |
| * result buffer(s), sizeof() is not reliable. Use the actual |
| * allocated buffer size, H24x7_DATA_BUFFER_SIZE. |
| */ |
| ret = plpar_hcall_norets(H_GET_24X7_DATA, |
| virt_to_phys(request_buffer), H24x7_DATA_BUFFER_SIZE, |
| virt_to_phys(result_buffer), H24x7_DATA_BUFFER_SIZE); |
| |
| if (ret) { |
| struct hv_24x7_request *req; |
| |
| req = request_buffer->requests; |
| pr_notice_ratelimited("hcall failed: [%d %#x %#x %d] => ret 0x%lx (%ld) detail=0x%x failing ix=%x\n", |
| req->performance_domain, req->data_offset, |
| req->starting_ix, req->starting_lpar_ix, |
| ret, ret, result_buffer->detailed_rc, |
| result_buffer->failing_request_ix); |
| return -EIO; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Add the given @event to the next slot in the 24x7 request_buffer. |
| * |
| * Note that H_GET_24X7_DATA hcall allows reading several counters' |
| * values in a single HCALL. We expect the caller to add events to the |
| * request buffer one by one, make the HCALL and process the results. |
| */ |
| static int add_event_to_24x7_request(struct perf_event *event, |
| struct hv_24x7_request_buffer *request_buffer) |
| { |
| u16 idx; |
| int i; |
| size_t req_size; |
| struct hv_24x7_request *req; |
| |
| if (request_buffer->num_requests >= |
| max_num_requests(request_buffer->interface_version)) { |
| pr_devel("Too many requests for 24x7 HCALL %d\n", |
| request_buffer->num_requests); |
| return -EINVAL; |
| } |
| |
| switch (event_get_domain(event)) { |
| case HV_PERF_DOMAIN_PHYS_CHIP: |
| idx = event_get_chip(event); |
| break; |
| case HV_PERF_DOMAIN_PHYS_CORE: |
| idx = event_get_core(event); |
| break; |
| default: |
| idx = event_get_vcpu(event); |
| } |
| |
| req_size = H24x7_REQUEST_SIZE(request_buffer->interface_version); |
| |
| i = request_buffer->num_requests++; |
| req = (void *) request_buffer->requests + i * req_size; |
| |
| req->performance_domain = event_get_domain(event); |
| req->data_size = cpu_to_be16(8); |
| req->data_offset = cpu_to_be32(event_get_offset(event)); |
| req->starting_lpar_ix = cpu_to_be16(event_get_lpar(event)); |
| req->max_num_lpars = cpu_to_be16(1); |
| req->starting_ix = cpu_to_be16(idx); |
| req->max_ix = cpu_to_be16(1); |
| |
| if (request_buffer->interface_version > 1) { |
| if (domain_needs_aggregation(req->performance_domain)) |
| req->max_num_thread_groups = -1; |
| else if (req->performance_domain != HV_PERF_DOMAIN_PHYS_CHIP) { |
| req->starting_thread_group_ix = idx % 2; |
| req->max_num_thread_groups = 1; |
| } |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * get_count_from_result - get event count from all result elements in result |
| * |
| * If the event corresponding to this result needs aggregation of the result |
| * element values, then this function does that. |
| * |
| * @event: Event associated with @res. |
| * @resb: Result buffer containing @res. |
| * @res: Result to work on. |
| * @countp: Output variable containing the event count. |
| * @next: Optional output variable pointing to the next result in @resb. |
| */ |
| static int get_count_from_result(struct perf_event *event, |
| struct hv_24x7_data_result_buffer *resb, |
| struct hv_24x7_result *res, u64 *countp, |
| struct hv_24x7_result **next) |
| { |
| u16 num_elements = be16_to_cpu(res->num_elements_returned); |
| u16 data_size = be16_to_cpu(res->result_element_data_size); |
| unsigned int data_offset; |
| void *element_data; |
| int i; |
| u64 count; |
| |
| /* |
| * We can bail out early if the result is empty. |
| */ |
| if (!num_elements) { |
| pr_debug("Result of request %hhu is empty, nothing to do\n", |
| res->result_ix); |
| |
| if (next) |
| *next = (struct hv_24x7_result *) res->elements; |
| |
| return -ENODATA; |
| } |
| |
| /* |
| * Since we always specify 1 as the maximum for the smallest resource |
| * we're requesting, there should to be only one element per result. |
| * Except when an event needs aggregation, in which case there are more. |
| */ |
| if (num_elements != 1 && |
| !domain_needs_aggregation(event_get_domain(event))) { |
| pr_err("Error: result of request %hhu has %hu elements\n", |
| res->result_ix, num_elements); |
| |
| return -EIO; |
| } |
| |
| if (data_size != sizeof(u64)) { |
| pr_debug("Error: result of request %hhu has data of %hu bytes\n", |
| res->result_ix, data_size); |
| |
| return -ENOTSUPP; |
| } |
| |
| if (resb->interface_version == 1) |
| data_offset = offsetof(struct hv_24x7_result_element_v1, |
| element_data); |
| else |
| data_offset = offsetof(struct hv_24x7_result_element_v2, |
| element_data); |
| |
| /* Go through the result elements in the result. */ |
| for (i = count = 0, element_data = res->elements + data_offset; |
| i < num_elements; |
| i++, element_data += data_size + data_offset) |
| count += be64_to_cpu(*((u64 *) element_data)); |
| |
| *countp = count; |
| |
| /* The next result is after the last result element. */ |
| if (next) |
| *next = element_data - data_offset; |
| |
| return 0; |
| } |
| |
| static int single_24x7_request(struct perf_event *event, u64 *count) |
| { |
| int ret; |
| struct hv_24x7_request_buffer *request_buffer; |
| struct hv_24x7_data_result_buffer *result_buffer; |
| |
| BUILD_BUG_ON(sizeof(*request_buffer) > 4096); |
| BUILD_BUG_ON(sizeof(*result_buffer) > 4096); |
| |
| request_buffer = (void *)get_cpu_var(hv_24x7_reqb); |
| result_buffer = (void *)get_cpu_var(hv_24x7_resb); |
| |
| init_24x7_request(request_buffer, result_buffer); |
| |
| ret = add_event_to_24x7_request(event, request_buffer); |
| if (ret) |
| goto out; |
| |
| ret = make_24x7_request(request_buffer, result_buffer); |
| if (ret) |
| goto out; |
| |
| /* process result from hcall */ |
| ret = get_count_from_result(event, result_buffer, |
| result_buffer->results, count, NULL); |
| |
| out: |
| put_cpu_var(hv_24x7_reqb); |
| put_cpu_var(hv_24x7_resb); |
| return ret; |
| } |
| |
| |
| static int h_24x7_event_init(struct perf_event *event) |
| { |
| struct hv_perf_caps caps; |
| unsigned int domain; |
| unsigned long hret; |
| u64 ct; |
| |
| /* Not our event */ |
| if (event->attr.type != event->pmu->type) |
| return -ENOENT; |
| |
| /* Unused areas must be 0 */ |
| if (event_get_reserved1(event) || |
| event_get_reserved2(event) || |
| event_get_reserved3(event)) { |
| pr_devel("reserved set when forbidden 0x%llx(0x%llx) 0x%llx(0x%llx) 0x%llx(0x%llx)\n", |
| event->attr.config, |
| event_get_reserved1(event), |
| event->attr.config1, |
| event_get_reserved2(event), |
| event->attr.config2, |
| event_get_reserved3(event)); |
| return -EINVAL; |
| } |
| |
| /* no branch sampling */ |
| if (has_branch_stack(event)) |
| return -EOPNOTSUPP; |
| |
| /* offset must be 8 byte aligned */ |
| if (event_get_offset(event) % 8) { |
| pr_devel("bad alignment\n"); |
| return -EINVAL; |
| } |
| |
| domain = event_get_domain(event); |
| if (domain >= HV_PERF_DOMAIN_MAX) { |
| pr_devel("invalid domain %d\n", domain); |
| return -EINVAL; |
| } |
| |
| hret = hv_perf_caps_get(&caps); |
| if (hret) { |
| pr_devel("could not get capabilities: rc=%ld\n", hret); |
| return -EIO; |
| } |
| |
| /* Physical domains & other lpars require extra capabilities */ |
| if (!caps.collect_privileged && (is_physical_domain(domain) || |
| (event_get_lpar(event) != event_get_lpar_max()))) { |
| pr_devel("hv permissions disallow: is_physical_domain:%d, lpar=0x%llx\n", |
| is_physical_domain(domain), |
| event_get_lpar(event)); |
| return -EACCES; |
| } |
| |
| /* Get the initial value of the counter for this event */ |
| if (single_24x7_request(event, &ct)) { |
| pr_devel("test hcall failed\n"); |
| return -EIO; |
| } |
| (void)local64_xchg(&event->hw.prev_count, ct); |
| |
| return 0; |
| } |
| |
| static u64 h_24x7_get_value(struct perf_event *event) |
| { |
| u64 ct; |
| |
| if (single_24x7_request(event, &ct)) |
| /* We checked this in event init, shouldn't fail here... */ |
| return 0; |
| |
| return ct; |
| } |
| |
| static void update_event_count(struct perf_event *event, u64 now) |
| { |
| s64 prev; |
| |
| prev = local64_xchg(&event->hw.prev_count, now); |
| local64_add(now - prev, &event->count); |
| } |
| |
| static void h_24x7_event_read(struct perf_event *event) |
| { |
| u64 now; |
| struct hv_24x7_request_buffer *request_buffer; |
| struct hv_24x7_hw *h24x7hw; |
| int txn_flags; |
| |
| txn_flags = __this_cpu_read(hv_24x7_txn_flags); |
| |
| /* |
| * If in a READ transaction, add this counter to the list of |
| * counters to read during the next HCALL (i.e commit_txn()). |
| * If not in a READ transaction, go ahead and make the HCALL |
| * to read this counter by itself. |
| */ |
| |
| if (txn_flags & PERF_PMU_TXN_READ) { |
| int i; |
| int ret; |
| |
| if (__this_cpu_read(hv_24x7_txn_err)) |
| return; |
| |
| request_buffer = (void *)get_cpu_var(hv_24x7_reqb); |
| |
| ret = add_event_to_24x7_request(event, request_buffer); |
| if (ret) { |
| __this_cpu_write(hv_24x7_txn_err, ret); |
| } else { |
| /* |
| * Associate the event with the HCALL request index, |
| * so ->commit_txn() can quickly find/update count. |
| */ |
| i = request_buffer->num_requests - 1; |
| |
| h24x7hw = &get_cpu_var(hv_24x7_hw); |
| h24x7hw->events[i] = event; |
| put_cpu_var(h24x7hw); |
| } |
| |
| put_cpu_var(hv_24x7_reqb); |
| } else { |
| now = h_24x7_get_value(event); |
| update_event_count(event, now); |
| } |
| } |
| |
| static void h_24x7_event_start(struct perf_event *event, int flags) |
| { |
| if (flags & PERF_EF_RELOAD) |
| local64_set(&event->hw.prev_count, h_24x7_get_value(event)); |
| } |
| |
| static void h_24x7_event_stop(struct perf_event *event, int flags) |
| { |
| h_24x7_event_read(event); |
| } |
| |
| static int h_24x7_event_add(struct perf_event *event, int flags) |
| { |
| if (flags & PERF_EF_START) |
| h_24x7_event_start(event, flags); |
| |
| return 0; |
| } |
| |
| /* |
| * 24x7 counters only support READ transactions. They are |
| * always counting and dont need/support ADD transactions. |
| * Cache the flags, but otherwise ignore transactions that |
| * are not PERF_PMU_TXN_READ. |
| */ |
| static void h_24x7_event_start_txn(struct pmu *pmu, unsigned int flags) |
| { |
| struct hv_24x7_request_buffer *request_buffer; |
| struct hv_24x7_data_result_buffer *result_buffer; |
| |
| /* We should not be called if we are already in a txn */ |
| WARN_ON_ONCE(__this_cpu_read(hv_24x7_txn_flags)); |
| |
| __this_cpu_write(hv_24x7_txn_flags, flags); |
| if (flags & ~PERF_PMU_TXN_READ) |
| return; |
| |
| request_buffer = (void *)get_cpu_var(hv_24x7_reqb); |
| result_buffer = (void *)get_cpu_var(hv_24x7_resb); |
| |
| init_24x7_request(request_buffer, result_buffer); |
| |
| put_cpu_var(hv_24x7_resb); |
| put_cpu_var(hv_24x7_reqb); |
| } |
| |
| /* |
| * Clean up transaction state. |
| * |
| * NOTE: Ignore state of request and result buffers for now. |
| * We will initialize them during the next read/txn. |
| */ |
| static void reset_txn(void) |
| { |
| __this_cpu_write(hv_24x7_txn_flags, 0); |
| __this_cpu_write(hv_24x7_txn_err, 0); |
| } |
| |
| /* |
| * 24x7 counters only support READ transactions. They are always counting |
| * and dont need/support ADD transactions. Clear ->txn_flags but otherwise |
| * ignore transactions that are not of type PERF_PMU_TXN_READ. |
| * |
| * For READ transactions, submit all pending 24x7 requests (i.e requests |
| * that were queued by h_24x7_event_read()), to the hypervisor and update |
| * the event counts. |
| */ |
| static int h_24x7_event_commit_txn(struct pmu *pmu) |
| { |
| struct hv_24x7_request_buffer *request_buffer; |
| struct hv_24x7_data_result_buffer *result_buffer; |
| struct hv_24x7_result *res, *next_res; |
| u64 count; |
| int i, ret, txn_flags; |
| struct hv_24x7_hw *h24x7hw; |
| |
| txn_flags = __this_cpu_read(hv_24x7_txn_flags); |
| WARN_ON_ONCE(!txn_flags); |
| |
| ret = 0; |
| if (txn_flags & ~PERF_PMU_TXN_READ) |
| goto out; |
| |
| ret = __this_cpu_read(hv_24x7_txn_err); |
| if (ret) |
| goto out; |
| |
| request_buffer = (void *)get_cpu_var(hv_24x7_reqb); |
| result_buffer = (void *)get_cpu_var(hv_24x7_resb); |
| |
| ret = make_24x7_request(request_buffer, result_buffer); |
| if (ret) |
| goto put_reqb; |
| |
| h24x7hw = &get_cpu_var(hv_24x7_hw); |
| |
| /* Go through results in the result buffer to update event counts. */ |
| for (i = 0, res = result_buffer->results; |
| i < result_buffer->num_results; i++, res = next_res) { |
| struct perf_event *event = h24x7hw->events[res->result_ix]; |
| |
| ret = get_count_from_result(event, result_buffer, res, &count, |
| &next_res); |
| if (ret) |
| break; |
| |
| update_event_count(event, count); |
| } |
| |
| put_cpu_var(hv_24x7_hw); |
| |
| put_reqb: |
| put_cpu_var(hv_24x7_resb); |
| put_cpu_var(hv_24x7_reqb); |
| out: |
| reset_txn(); |
| return ret; |
| } |
| |
| /* |
| * 24x7 counters only support READ transactions. They are always counting |
| * and dont need/support ADD transactions. However, regardless of type |
| * of transaction, all we need to do is cleanup, so we don't have to check |
| * the type of transaction. |
| */ |
| static void h_24x7_event_cancel_txn(struct pmu *pmu) |
| { |
| WARN_ON_ONCE(!__this_cpu_read(hv_24x7_txn_flags)); |
| reset_txn(); |
| } |
| |
| static struct pmu h_24x7_pmu = { |
| .task_ctx_nr = perf_invalid_context, |
| |
| .name = "hv_24x7", |
| .attr_groups = attr_groups, |
| .event_init = h_24x7_event_init, |
| .add = h_24x7_event_add, |
| .del = h_24x7_event_stop, |
| .start = h_24x7_event_start, |
| .stop = h_24x7_event_stop, |
| .read = h_24x7_event_read, |
| .start_txn = h_24x7_event_start_txn, |
| .commit_txn = h_24x7_event_commit_txn, |
| .cancel_txn = h_24x7_event_cancel_txn, |
| .capabilities = PERF_PMU_CAP_NO_EXCLUDE, |
| }; |
| |
| static int ppc_hv_24x7_cpu_online(unsigned int cpu) |
| { |
| if (cpumask_empty(&hv_24x7_cpumask)) |
| cpumask_set_cpu(cpu, &hv_24x7_cpumask); |
| |
| return 0; |
| } |
| |
| static int ppc_hv_24x7_cpu_offline(unsigned int cpu) |
| { |
| int target; |
| |
| /* Check if exiting cpu is used for collecting 24x7 events */ |
| if (!cpumask_test_and_clear_cpu(cpu, &hv_24x7_cpumask)) |
| return 0; |
| |
| /* Find a new cpu to collect 24x7 events */ |
| target = cpumask_last(cpu_active_mask); |
| |
| if (target < 0 || target >= nr_cpu_ids) { |
| pr_err("hv_24x7: CPU hotplug init failed\n"); |
| return -1; |
| } |
| |
| /* Migrate 24x7 events to the new target */ |
| cpumask_set_cpu(target, &hv_24x7_cpumask); |
| perf_pmu_migrate_context(&h_24x7_pmu, cpu, target); |
| |
| return 0; |
| } |
| |
| static int hv_24x7_cpu_hotplug_init(void) |
| { |
| return cpuhp_setup_state(CPUHP_AP_PERF_POWERPC_HV_24x7_ONLINE, |
| "perf/powerpc/hv_24x7:online", |
| ppc_hv_24x7_cpu_online, |
| ppc_hv_24x7_cpu_offline); |
| } |
| |
| static int hv_24x7_init(void) |
| { |
| int r; |
| unsigned long hret; |
| struct hv_perf_caps caps; |
| |
| if (!firmware_has_feature(FW_FEATURE_LPAR)) { |
| pr_debug("not a virtualized system, not enabling\n"); |
| return -ENODEV; |
| } else if (!cur_cpu_spec->oprofile_cpu_type) |
| return -ENODEV; |
| |
| /* POWER8 only supports v1, while POWER9 only supports v2. */ |
| if (!strcmp(cur_cpu_spec->oprofile_cpu_type, "ppc64/power8")) |
| interface_version = 1; |
| else { |
| interface_version = 2; |
| |
| /* SMT8 in POWER9 needs to aggregate result elements. */ |
| if (threads_per_core == 8) |
| aggregate_result_elements = true; |
| } |
| |
| hret = hv_perf_caps_get(&caps); |
| if (hret) { |
| pr_debug("could not obtain capabilities, not enabling, rc=%ld\n", |
| hret); |
| return -ENODEV; |
| } |
| |
| hv_page_cache = kmem_cache_create("hv-page-4096", 4096, 4096, 0, NULL); |
| if (!hv_page_cache) |
| return -ENOMEM; |
| |
| /* sampling not supported */ |
| h_24x7_pmu.capabilities |= PERF_PMU_CAP_NO_INTERRUPT; |
| |
| r = create_events_from_catalog(&event_group.attrs, |
| &event_desc_group.attrs, |
| &event_long_desc_group.attrs); |
| |
| if (r) |
| return r; |
| |
| /* init cpuhotplug */ |
| r = hv_24x7_cpu_hotplug_init(); |
| if (r) |
| return r; |
| |
| r = perf_pmu_register(&h_24x7_pmu, h_24x7_pmu.name, -1); |
| if (r) |
| return r; |
| |
| read_24x7_sys_info(); |
| |
| return 0; |
| } |
| |
| device_initcall(hv_24x7_init); |