Update Linux to v5.10.109
Sourced from [1]
[1] https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.10.109.tar.xz
Change-Id: I19bca9fc6762d4e63bcf3e4cba88bbe560d9c76c
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/tools/testing/selftests/resctrl/cache.c b/tools/testing/selftests/resctrl/cache.c
new file mode 100644
index 0000000..5922cc1
--- /dev/null
+++ b/tools/testing/selftests/resctrl/cache.c
@@ -0,0 +1,272 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <stdint.h>
+#include "resctrl.h"
+
+struct read_format {
+ __u64 nr; /* The number of events */
+ struct {
+ __u64 value; /* The value of the event */
+ } values[2];
+};
+
+static struct perf_event_attr pea_llc_miss;
+static struct read_format rf_cqm;
+static int fd_lm;
+char llc_occup_path[1024];
+
+static void initialize_perf_event_attr(void)
+{
+ pea_llc_miss.type = PERF_TYPE_HARDWARE;
+ pea_llc_miss.size = sizeof(struct perf_event_attr);
+ pea_llc_miss.read_format = PERF_FORMAT_GROUP;
+ pea_llc_miss.exclude_kernel = 1;
+ pea_llc_miss.exclude_hv = 1;
+ pea_llc_miss.exclude_idle = 1;
+ pea_llc_miss.exclude_callchain_kernel = 1;
+ pea_llc_miss.inherit = 1;
+ pea_llc_miss.exclude_guest = 1;
+ pea_llc_miss.disabled = 1;
+}
+
+static void ioctl_perf_event_ioc_reset_enable(void)
+{
+ ioctl(fd_lm, PERF_EVENT_IOC_RESET, 0);
+ ioctl(fd_lm, PERF_EVENT_IOC_ENABLE, 0);
+}
+
+static int perf_event_open_llc_miss(pid_t pid, int cpu_no)
+{
+ fd_lm = perf_event_open(&pea_llc_miss, pid, cpu_no, -1,
+ PERF_FLAG_FD_CLOEXEC);
+ if (fd_lm == -1) {
+ perror("Error opening leader");
+ ctrlc_handler(0, NULL, NULL);
+ return -1;
+ }
+
+ return 0;
+}
+
+static int initialize_llc_perf(void)
+{
+ memset(&pea_llc_miss, 0, sizeof(struct perf_event_attr));
+ memset(&rf_cqm, 0, sizeof(struct read_format));
+
+ /* Initialize perf_event_attr structures for HW_CACHE_MISSES */
+ initialize_perf_event_attr();
+
+ pea_llc_miss.config = PERF_COUNT_HW_CACHE_MISSES;
+
+ rf_cqm.nr = 1;
+
+ return 0;
+}
+
+static int reset_enable_llc_perf(pid_t pid, int cpu_no)
+{
+ int ret = 0;
+
+ ret = perf_event_open_llc_miss(pid, cpu_no);
+ if (ret < 0)
+ return ret;
+
+ /* Start counters to log values */
+ ioctl_perf_event_ioc_reset_enable();
+
+ return 0;
+}
+
+/*
+ * get_llc_perf: llc cache miss through perf events
+ * @cpu_no: CPU number that the benchmark PID is binded to
+ *
+ * Perf events like HW_CACHE_MISSES could be used to validate number of
+ * cache lines allocated.
+ *
+ * Return: =0 on success. <0 on failure.
+ */
+static int get_llc_perf(unsigned long *llc_perf_miss)
+{
+ __u64 total_misses;
+
+ /* Stop counters after one span to get miss rate */
+
+ ioctl(fd_lm, PERF_EVENT_IOC_DISABLE, 0);
+
+ if (read(fd_lm, &rf_cqm, sizeof(struct read_format)) == -1) {
+ perror("Could not get llc misses through perf");
+
+ return -1;
+ }
+
+ total_misses = rf_cqm.values[0].value;
+
+ close(fd_lm);
+
+ *llc_perf_miss = total_misses;
+
+ return 0;
+}
+
+/*
+ * Get LLC Occupancy as reported by RESCTRL FS
+ * For CQM,
+ * 1. If con_mon grp and mon grp given, then read from mon grp in
+ * con_mon grp
+ * 2. If only con_mon grp given, then read from con_mon grp
+ * 3. If both not given, then read from root con_mon grp
+ * For CAT,
+ * 1. If con_mon grp given, then read from it
+ * 2. If con_mon grp not given, then read from root con_mon grp
+ *
+ * Return: =0 on success. <0 on failure.
+ */
+static int get_llc_occu_resctrl(unsigned long *llc_occupancy)
+{
+ FILE *fp;
+
+ fp = fopen(llc_occup_path, "r");
+ if (!fp) {
+ perror("Failed to open results file");
+
+ return errno;
+ }
+ if (fscanf(fp, "%lu", llc_occupancy) <= 0) {
+ perror("Could not get llc occupancy");
+ fclose(fp);
+
+ return -1;
+ }
+ fclose(fp);
+
+ return 0;
+}
+
+/*
+ * print_results_cache: the cache results are stored in a file
+ * @filename: file that stores the results
+ * @bm_pid: child pid that runs benchmark
+ * @llc_value: perf miss value /
+ * llc occupancy value reported by resctrl FS
+ *
+ * Return: 0 on success. non-zero on failure.
+ */
+static int print_results_cache(char *filename, int bm_pid,
+ unsigned long llc_value)
+{
+ FILE *fp;
+
+ if (strcmp(filename, "stdio") == 0 || strcmp(filename, "stderr") == 0) {
+ printf("Pid: %d \t LLC_value: %lu\n", bm_pid,
+ llc_value);
+ } else {
+ fp = fopen(filename, "a");
+ if (!fp) {
+ perror("Cannot open results file");
+
+ return errno;
+ }
+ fprintf(fp, "Pid: %d \t llc_value: %lu\n", bm_pid, llc_value);
+ fclose(fp);
+ }
+
+ return 0;
+}
+
+int measure_cache_vals(struct resctrl_val_param *param, int bm_pid)
+{
+ unsigned long llc_perf_miss = 0, llc_occu_resc = 0, llc_value = 0;
+ int ret;
+
+ /*
+ * Measure cache miss from perf.
+ */
+ if (!strncmp(param->resctrl_val, CAT_STR, sizeof(CAT_STR))) {
+ ret = get_llc_perf(&llc_perf_miss);
+ if (ret < 0)
+ return ret;
+ llc_value = llc_perf_miss;
+ }
+
+ /*
+ * Measure llc occupancy from resctrl.
+ */
+ if (!strncmp(param->resctrl_val, CQM_STR, sizeof(CQM_STR))) {
+ ret = get_llc_occu_resctrl(&llc_occu_resc);
+ if (ret < 0)
+ return ret;
+ llc_value = llc_occu_resc;
+ }
+ ret = print_results_cache(param->filename, bm_pid, llc_value);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+/*
+ * cache_val: execute benchmark and measure LLC occupancy resctrl
+ * and perf cache miss for the benchmark
+ * @param: parameters passed to cache_val()
+ *
+ * Return: 0 on success. non-zero on failure.
+ */
+int cat_val(struct resctrl_val_param *param)
+{
+ int malloc_and_init_memory = 1, memflush = 1, operation = 0, ret = 0;
+ char *resctrl_val = param->resctrl_val;
+ pid_t bm_pid;
+
+ if (strcmp(param->filename, "") == 0)
+ sprintf(param->filename, "stdio");
+
+ bm_pid = getpid();
+
+ /* Taskset benchmark to specified cpu */
+ ret = taskset_benchmark(bm_pid, param->cpu_no);
+ if (ret)
+ return ret;
+
+ /* Write benchmark to specified con_mon grp, mon_grp in resctrl FS*/
+ ret = write_bm_pid_to_resctrl(bm_pid, param->ctrlgrp, param->mongrp,
+ resctrl_val);
+ if (ret)
+ return ret;
+
+ if (!strncmp(resctrl_val, CAT_STR, sizeof(CAT_STR))) {
+ ret = initialize_llc_perf();
+ if (ret)
+ return ret;
+ }
+
+ /* Test runs until the callback setup() tells the test to stop. */
+ while (1) {
+ if (!strncmp(resctrl_val, CAT_STR, sizeof(CAT_STR))) {
+ ret = param->setup(1, param);
+ if (ret) {
+ ret = 0;
+ break;
+ }
+ ret = reset_enable_llc_perf(bm_pid, param->cpu_no);
+ if (ret)
+ break;
+
+ if (run_fill_buf(param->span, malloc_and_init_memory,
+ memflush, operation, resctrl_val)) {
+ fprintf(stderr, "Error-running fill buffer\n");
+ ret = -1;
+ break;
+ }
+
+ sleep(1);
+ ret = measure_cache_vals(param, bm_pid);
+ if (ret)
+ break;
+ } else {
+ break;
+ }
+ }
+
+ return ret;
+}