--- /dev/null
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Auxtrace support for s390 CPU measurement sampling facility
+ *
+ * Copyright IBM Corp. 2018
+ * Author(s): Hendrik Brueckner <brueckner@linux.ibm.com>
+ * Thomas Richter <tmricht@linux.ibm.com>
+ */
+#ifndef S390_CPUMSF_KERNEL_H
+#define S390_CPUMSF_KERNEL_H
+
+#define S390_CPUMSF_PAGESZ 4096 /* Size of sample block units */
+#define S390_CPUMSF_DIAG_DEF_FIRST 0x8001 /* Diagnostic entry lowest id */
+
+struct hws_basic_entry {
+ unsigned int def:16; /* 0-15 Data Entry Format */
+ unsigned int R:4; /* 16-19 reserved */
+ unsigned int U:4; /* 20-23 Number of unique instruct. */
+ unsigned int z:2; /* zeros */
+ unsigned int T:1; /* 26 PSW DAT mode */
+ unsigned int W:1; /* 27 PSW wait state */
+ unsigned int P:1; /* 28 PSW Problem state */
+ unsigned int AS:2; /* 29-30 PSW address-space control */
+ unsigned int I:1; /* 31 entry valid or invalid */
+ unsigned int CL:2; /* 32-33 Configuration Level */
+ unsigned int:14;
+ unsigned int prim_asn:16; /* primary ASN */
+ unsigned long long ia; /* Instruction Address */
+ unsigned long long gpp; /* Guest Program Parameter */
+ unsigned long long hpp; /* Host Program Parameter */
+};
+
+struct hws_diag_entry {
+ unsigned int def:16; /* 0-15 Data Entry Format */
+ unsigned int R:15; /* 16-19 and 20-30 reserved */
+ unsigned int I:1; /* 31 entry valid or invalid */
+ u8 data[]; /* Machine-dependent sample data */
+};
+
+struct hws_combined_entry {
+ struct hws_basic_entry basic; /* Basic-sampling data entry */
+ struct hws_diag_entry diag; /* Diagnostic-sampling data entry */
+};
+
+struct hws_trailer_entry {
+ union {
+ struct {
+ unsigned int f:1; /* 0 - Block Full Indicator */
+ unsigned int a:1; /* 1 - Alert request control */
+ unsigned int t:1; /* 2 - Timestamp format */
+ unsigned int:29; /* 3 - 31: Reserved */
+ unsigned int bsdes:16; /* 32-47: size of basic SDE */
+ unsigned int dsdes:16; /* 48-63: size of diagnostic SDE */
+ };
+ unsigned long long flags; /* 0 - 64: All indicators */
+ };
+ unsigned long long overflow; /* 64 - sample Overflow count */
+ unsigned char timestamp[16]; /* 16 - 31 timestamp */
+ unsigned long long reserved1; /* 32 -Reserved */
+ unsigned long long reserved2; /* */
+ union { /* 48 - reserved for programming use */
+ struct {
+ unsigned long long clock_base:1; /* in progusage2 */
+ unsigned long long progusage1:63;
+ unsigned long long progusage2;
+ };
+ unsigned long long progusage[2];
+ };
+};
+
+#endif
#include "debug.h"
#include "auxtrace.h"
#include "s390-cpumsf.h"
+#include "s390-cpumsf-kernel.h"
struct s390_cpumsf {
struct auxtrace auxtrace;
struct machine *machine;
u32 auxtrace_type;
u32 pmu_type;
+ u16 machine_type;
};
+/* Display s390 CPU measurement facility basic-sampling data entry */
+static bool s390_cpumsf_basic_show(const char *color, size_t pos,
+ struct hws_basic_entry *basic)
+{
+ if (basic->def != 1) {
+ pr_err("Invalid AUX trace basic entry [%#08zx]\n", pos);
+ return false;
+ }
+ color_fprintf(stdout, color, " [%#08zx] Basic Def:%04x Inst:%#04x"
+ " %c%c%c%c AS:%d ASN:%#04x IA:%#018llx\n"
+ "\t\tCL:%d HPP:%#018llx GPP:%#018llx\n",
+ pos, basic->def, basic->U,
+ basic->T ? 'T' : ' ',
+ basic->W ? 'W' : ' ',
+ basic->P ? 'P' : ' ',
+ basic->I ? 'I' : ' ',
+ basic->AS, basic->prim_asn, basic->ia, basic->CL,
+ basic->hpp, basic->gpp);
+ return true;
+}
+
+/* Display s390 CPU measurement facility diagnostic-sampling data entry */
+static bool s390_cpumsf_diag_show(const char *color, size_t pos,
+ struct hws_diag_entry *diag)
+{
+ if (diag->def < S390_CPUMSF_DIAG_DEF_FIRST) {
+ pr_err("Invalid AUX trace diagnostic entry [%#08zx]\n", pos);
+ return false;
+ }
+ color_fprintf(stdout, color, " [%#08zx] Diag Def:%04x %c\n",
+ pos, diag->def, diag->I ? 'I' : ' ');
+ return true;
+}
+
+/* Return TOD timestamp contained in an trailer entry */
+static unsigned long long trailer_timestamp(struct hws_trailer_entry *te)
+{
+ /* te->t set: TOD in STCKE format, bytes 8-15
+ * to->t not set: TOD in STCK format, bytes 0-7
+ */
+ unsigned long long ts;
+
+ memcpy(&ts, &te->timestamp[te->t], sizeof(ts));
+ return ts;
+}
+
+/* Display s390 CPU measurement facility trailer entry */
+static bool s390_cpumsf_trailer_show(const char *color, size_t pos,
+ struct hws_trailer_entry *te)
+{
+ if (te->bsdes != sizeof(struct hws_basic_entry)) {
+ pr_err("Invalid AUX trace trailer entry [%#08zx]\n", pos);
+ return false;
+ }
+ color_fprintf(stdout, color, " [%#08zx] Trailer %c%c%c bsdes:%d"
+ " dsdes:%d Overflow:%lld Time:%#llx\n"
+ "\t\tC:%d TOD:%#lx 1:%#llx 2:%#llx\n",
+ pos,
+ te->f ? 'F' : ' ',
+ te->a ? 'A' : ' ',
+ te->t ? 'T' : ' ',
+ te->bsdes, te->dsdes, te->overflow,
+ trailer_timestamp(te), te->clock_base, te->progusage2,
+ te->progusage[0], te->progusage[1]);
+ return true;
+}
+
+/* Test a sample data block. It must be 4KB or a multiple thereof in size and
+ * 4KB page aligned. Each sample data page has a trailer entry at the
+ * end which contains the sample entry data sizes.
+ *
+ * Return true if the sample data block passes the checks and set the
+ * basic set entry size and diagnostic set entry size.
+ *
+ * Return false on failure.
+ *
+ * Note: Old hardware does not set the basic or diagnostic entry sizes
+ * in the trailer entry. Use the type number instead.
+ */
+static bool s390_cpumsf_validate(int machine_type,
+ unsigned char *buf, size_t len,
+ unsigned short *bsdes,
+ unsigned short *dsdes)
+{
+ struct hws_basic_entry *basic = (struct hws_basic_entry *)buf;
+ struct hws_trailer_entry *te;
+
+ *dsdes = *bsdes = 0;
+ if (len & (S390_CPUMSF_PAGESZ - 1)) /* Illegal size */
+ return false;
+ if (basic->def != 1) /* No basic set entry, must be first */
+ return false;
+ /* Check for trailer entry at end of SDB */
+ te = (struct hws_trailer_entry *)(buf + S390_CPUMSF_PAGESZ
+ - sizeof(*te));
+ *bsdes = te->bsdes;
+ *dsdes = te->dsdes;
+ if (!te->bsdes && !te->dsdes) {
+ /* Very old hardware, use CPUID */
+ switch (machine_type) {
+ case 2097:
+ case 2098:
+ *dsdes = 64;
+ *bsdes = 32;
+ break;
+ case 2817:
+ case 2818:
+ *dsdes = 74;
+ *bsdes = 32;
+ break;
+ case 2827:
+ case 2828:
+ *dsdes = 85;
+ *bsdes = 32;
+ break;
+ default:
+ /* Illegal trailer entry */
+ return false;
+ }
+ }
+ return true;
+}
+
+/* Return true if there is room for another entry */
+static bool s390_cpumsf_reached_trailer(size_t entry_sz, size_t pos)
+{
+ size_t payload = S390_CPUMSF_PAGESZ - sizeof(struct hws_trailer_entry);
+
+ if (payload - (pos & (S390_CPUMSF_PAGESZ - 1)) < entry_sz)
+ return false;
+ return true;
+}
+
+/* Dump an auxiliary buffer. These buffers are multiple of
+ * 4KB SDB pages.
+ */
+static void s390_cpumsf_dump(struct s390_cpumsf *sf,
+ unsigned char *buf, size_t len)
+{
+ const char *color = PERF_COLOR_BLUE;
+ struct hws_basic_entry *basic;
+ struct hws_diag_entry *diag;
+ size_t pos = 0;
+ unsigned short bsdes, dsdes;
+
+ color_fprintf(stdout, color,
+ ". ... s390 AUX data: size %zu bytes\n",
+ len);
+
+ if (!s390_cpumsf_validate(sf->machine_type, buf, len, &bsdes,
+ &dsdes)) {
+ pr_err("Invalid AUX trace data block size:%zu"
+ " (type:%d bsdes:%hd dsdes:%hd)\n",
+ len, sf->machine_type, bsdes, dsdes);
+ return;
+ }
+
+ /* s390 kernel always returns 4KB blocks fully occupied,
+ * no partially filled SDBs.
+ */
+ while (pos < len) {
+ /* Handle Basic entry */
+ basic = (struct hws_basic_entry *)(buf + pos);
+ if (s390_cpumsf_basic_show(color, pos, basic))
+ pos += bsdes;
+ else
+ return;
+
+ /* Handle Diagnostic entry */
+ diag = (struct hws_diag_entry *)(buf + pos);
+ if (s390_cpumsf_diag_show(color, pos, diag))
+ pos += dsdes;
+ else
+ return;
+
+ /* Check for trailer entry */
+ if (!s390_cpumsf_reached_trailer(bsdes + dsdes, pos)) {
+ /* Show trailer entry */
+ struct hws_trailer_entry te;
+
+ pos = (pos + S390_CPUMSF_PAGESZ)
+ & ~(S390_CPUMSF_PAGESZ - 1);
+ pos -= sizeof(te);
+ memcpy(&te, buf + pos, sizeof(te));
+ /* Set descriptor sizes in case of old hardware
+ * where these values are not set.
+ */
+ te.bsdes = bsdes;
+ te.dsdes = dsdes;
+ if (s390_cpumsf_trailer_show(color, pos, &te))
+ pos += sizeof(te);
+ else
+ return;
+ }
+ }
+}
+
+static void s390_cpumsf_dump_event(struct s390_cpumsf *sf, unsigned char *buf,
+ size_t len)
+{
+ printf(".\n");
+ s390_cpumsf_dump(sf, buf, len);
+}
+
static int
s390_cpumsf_process_event(struct perf_session *session __maybe_unused,
union perf_event *event __maybe_unused,
}
static int
-s390_cpumsf_process_auxtrace_event(struct perf_session *session __maybe_unused,
+s390_cpumsf_process_auxtrace_event(struct perf_session *session,
union perf_event *event __maybe_unused,
struct perf_tool *tool __maybe_unused)
{
+ struct s390_cpumsf *sf = container_of(session->auxtrace,
+ struct s390_cpumsf,
+ auxtrace);
+
+ int fd = perf_data__fd(session->data);
+ struct auxtrace_buffer *buffer;
+ off_t data_offset;
+ int err;
+
+ if (perf_data__is_pipe(session->data)) {
+ data_offset = 0;
+ } else {
+ data_offset = lseek(fd, 0, SEEK_CUR);
+ if (data_offset == -1)
+ return -errno;
+ }
+
+ err = auxtrace_queues__add_event(&sf->queues, session, event,
+ data_offset, &buffer);
+ if (err)
+ return err;
+
+ /* Dump here after copying piped trace out of the pipe */
+ if (dump_trace) {
+ if (auxtrace_buffer__get_data(buffer, fd)) {
+ s390_cpumsf_dump_event(sf, buffer->data,
+ buffer->size);
+ auxtrace_buffer__put_data(buffer);
+ }
+ }
return 0;
}
free(sf);
}
+static int s390_cpumsf_get_type(const char *cpuid)
+{
+ int ret, family = 0;
+
+ ret = sscanf(cpuid, "%*[^,],%u", &family);
+ return (ret == 1) ? family : 0;
+}
+
int s390_cpumsf_process_auxtrace_info(union perf_event *event,
struct perf_session *session)
{
sf->machine = &session->machines.host; /* No kvm support */
sf->auxtrace_type = auxtrace_info->type;
sf->pmu_type = PERF_TYPE_RAW;
+ sf->machine_type = s390_cpumsf_get_type(session->evlist->env->cpuid);
sf->auxtrace.process_event = s390_cpumsf_process_event;
sf->auxtrace.process_auxtrace_event = s390_cpumsf_process_auxtrace_event;
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