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authorSai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>2020-01-16 13:32:36 -0800
committerShuah Khan <skhan@linuxfoundation.org>2020-02-10 18:38:08 -0700
commit1d3f08687d76c0a80be35bbab6d64b1a8f2730e8 (patch)
tree52ca1e9b31c7bfb627d5b20c6391a20a456904b0
parent591a6e8588fc1dbdc04355e8ad7b0be43d221c9c (diff)
selftests/resctrl: Read memory bandwidth from perf IMC counter and from resctrl file system
Total memory bandwidth can be monitored from perf IMC counter and from resctrl file system. Later the two will be compared to verify the total memory bandwidth read from resctrl is correct. Signed-off-by: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com> Co-developed-by: Babu Moger <babu.moger@amd.com> Signed-off-by: Babu Moger <babu.moger@amd.com> Co-developed-by: Fenghua Yu <fenghua.yu@intel.com> Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
-rw-r--r--tools/testing/selftests/resctrl/resctrl_val.c117
1 files changed, 117 insertions, 0 deletions
diff --git a/tools/testing/selftests/resctrl/resctrl_val.c b/tools/testing/selftests/resctrl/resctrl_val.c
new file mode 100644
index 000000000000..0ca4c9252516
--- /dev/null
+++ b/tools/testing/selftests/resctrl/resctrl_val.c
@@ -0,0 +1,117 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Memory bandwidth monitoring and allocation library
+ *
+ * Copyright (C) 2018 Intel Corporation
+ *
+ * Authors:
+ * Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>,
+ * Fenghua Yu <fenghua.yu@intel.com>
+ */
+#include "resctrl.h"
+
+#define UNCORE_IMC "uncore_imc"
+#define READ_FILE_NAME "events/cas_count_read"
+#define WRITE_FILE_NAME "events/cas_count_write"
+#define DYN_PMU_PATH "/sys/bus/event_source/devices"
+#define SCALE 0.00006103515625
+#define MAX_IMCS 20
+#define MAX_TOKENS 5
+#define READ 0
+#define WRITE 1
+#define CON_MON_MBM_LOCAL_BYTES_PATH \
+ "%s/%s/mon_groups/%s/mon_data/mon_L3_%02d/mbm_local_bytes"
+
+#define CON_MBM_LOCAL_BYTES_PATH \
+ "%s/%s/mon_data/mon_L3_%02d/mbm_local_bytes"
+
+#define MON_MBM_LOCAL_BYTES_PATH \
+ "%s/mon_groups/%s/mon_data/mon_L3_%02d/mbm_local_bytes"
+
+#define MBM_LOCAL_BYTES_PATH \
+ "%s/mon_data/mon_L3_%02d/mbm_local_bytes"
+
+struct membw_read_format {
+ __u64 value; /* The value of the event */
+ __u64 time_enabled; /* if PERF_FORMAT_TOTAL_TIME_ENABLED */
+ __u64 time_running; /* if PERF_FORMAT_TOTAL_TIME_RUNNING */
+ __u64 id; /* if PERF_FORMAT_ID */
+};
+
+struct imc_counter_config {
+ __u32 type;
+ __u64 event;
+ __u64 umask;
+ struct perf_event_attr pe;
+ struct membw_read_format return_value;
+ int fd;
+};
+
+static struct imc_counter_config imc_counters_config[MAX_IMCS][2];
+
+void membw_initialize_perf_event_attr(int i, int j)
+{
+ memset(&imc_counters_config[i][j].pe, 0,
+ sizeof(struct perf_event_attr));
+ imc_counters_config[i][j].pe.type = imc_counters_config[i][j].type;
+ imc_counters_config[i][j].pe.size = sizeof(struct perf_event_attr);
+ imc_counters_config[i][j].pe.disabled = 1;
+ imc_counters_config[i][j].pe.inherit = 1;
+ imc_counters_config[i][j].pe.exclude_guest = 0;
+ imc_counters_config[i][j].pe.config =
+ imc_counters_config[i][j].umask << 8 |
+ imc_counters_config[i][j].event;
+ imc_counters_config[i][j].pe.sample_type = PERF_SAMPLE_IDENTIFIER;
+ imc_counters_config[i][j].pe.read_format =
+ PERF_FORMAT_TOTAL_TIME_ENABLED | PERF_FORMAT_TOTAL_TIME_RUNNING;
+}
+
+void membw_ioctl_perf_event_ioc_reset_enable(int i, int j)
+{
+ ioctl(imc_counters_config[i][j].fd, PERF_EVENT_IOC_RESET, 0);
+ ioctl(imc_counters_config[i][j].fd, PERF_EVENT_IOC_ENABLE, 0);
+}
+
+void membw_ioctl_perf_event_ioc_disable(int i, int j)
+{
+ ioctl(imc_counters_config[i][j].fd, PERF_EVENT_IOC_DISABLE, 0);
+}
+
+/*
+ * get_event_and_umask: Parse config into event and umask
+ * @cas_count_cfg: Config
+ * @count: iMC number
+ * @op: Operation (read/write)
+ */
+void get_event_and_umask(char *cas_count_cfg, int count, bool op)
+{
+ char *token[MAX_TOKENS];
+ int i = 0;
+
+ strcat(cas_count_cfg, ",");
+ token[0] = strtok(cas_count_cfg, "=,");
+
+ for (i = 1; i < MAX_TOKENS; i++)
+ token[i] = strtok(NULL, "=,");
+
+ for (i = 0; i < MAX_TOKENS; i++) {
+ if (!token[i])
+ break;
+ if (strcmp(token[i], "event") == 0) {
+ if (op == READ)
+ imc_counters_config[count][READ].event =
+ strtol(token[i + 1], NULL, 16);
+ else
+ imc_counters_config[count][WRITE].event =
+ strtol(token[i + 1], NULL, 16);
+ }
+ if (strcmp(token[i], "umask") == 0) {
+ if (op == READ)
+ imc_counters_config[count][READ].umask =
+ strtol(token[i + 1], NULL, 16);
+ else
+ imc_counters_config[count][WRITE].umask =
+ strtol(token[i + 1], NULL, 16);
+ }
+ }
+}