Re: [PATCH 7/7] selftests/thermel/intel: Add test to read workload hint

[srinivas pandruvada <srinivas.pandruvada@linux.intel.com>]

On Wed, 2023-06-21 at 14:30 +0000, Zhang, Rui wrote:
> On Tue, 2023-06-20 at 16:01 -0700, Srinivas Pandruvada wrote:
> > Some SoCs have in built firmware support to classify current
> > running
> > workload and pass to OS for making power management decisions.
> > 
> > This test program waits for notification of workload type change
> > and prints. This program can be used to test this feature and also
> > allows other user space programs to use as a reference.
> > 
> > Signed-off-by: Srinivas Pandruvada
> > <srinivas.pandruvada@linux.intel.com>
> > ---
> >  .../testing/selftests/thermal/intel/Makefile  |  16 +++
> >  .../thermal/intel/workload_hint_test.c        | 114
> > ++++++++++++++++++
> >  2 files changed, 130 insertions(+)
> >  create mode 100644 tools/testing/selftests/thermal/intel/Makefile
> >  create mode 100644
> > tools/testing/selftests/thermal/intel/workload_hint_test.c
> > 
> > diff --git a/tools/testing/selftests/thermal/intel/Makefile
> > b/tools/testing/selftests/thermal/intel/Makefile
> > new file mode 100644
> > index 000000000000..02459e271ef7
> > --- /dev/null
> > +++ b/tools/testing/selftests/thermal/intel/Makefile
> > @@ -0,0 +1,16 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +ifndef CROSS_COMPILE
> > +uname_M := $(shell uname -m 2>/dev/null || echo not)
> > +ARCH ?= $(shell echo $(uname_M) | sed -e s/i.86/x86/ -e
> > s/x86_64/x86/)
> > +
> > +ifeq ($(ARCH),x86)
> > +TEST_PROGS := workload_hint_test
> > +
> > +all: $(TEST_PROGS)
> > +
> > +include ../../lib.mk
> > +
> > +clean:
> > +       rm -fr $(TEST_PROGS)
> > +endif
> > +endif
> > diff --git
> > a/tools/testing/selftests/thermal/intel/workload_hint_test.c
> > b/tools/testing/selftests/thermal/intel/workload_hint_test.c
> > new file mode 100644
> > index 000000000000..69a48a8ccbb4
> > --- /dev/null
> > +++ b/tools/testing/selftests/thermal/intel/workload_hint_test.c
> > @@ -0,0 +1,114 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +
> > +#define _GNU_SOURCE
> > +
> > +#include <stdio.h>
> > +#include <string.h>
> > +#include <stdlib.h>
> > +#include <unistd.h>
> > +#include <fcntl.h>
> > +#include <poll.h>
> > +
> > +#define WORKLOAD_NOTIFICATION_DELAY_ATTRIBUTE
> > "/sys/bus/pci/devices/0000:00:04.0/workload_hint/notification_delay
> > _m
> > s"
> > +#define WORKLOAD_ENABLE_ATTRIBUTE
> > "/sys/bus/pci/devices/0000:00:04.0/workload_hint/workload_hint_enab
> > le
> > "
> > +#define WORKLOAD_TYPE_INDEX_ATTRIBUTE 
> > "/sys/bus/pci/devices/0000:00:04.0/workload_hint/workload_type_inde
> > x"
> > +
> > +static const char * const workload_types[] = {
> > +       "idle",
> > +       "battery_life",
> > +       "sustained",
> > +       "bursty",
> > +       NULL
> > +};
> > +
> > +#define WORKLOAD_TYPE_MAX_INDEX        3
> > +
> > +int main(int argc, char **argv) {
> > +       struct pollfd ufd;
> > +       char index_str[4];
> > +       int fd, ret, index;
> > +       int delay = 0;
> > +
> > +       if (argc > 1) {
> > +               char delay_str[64];
> > +
> > +               sscanf(argv[1], "%d", &delay);
> > +               printf("Setting notification delay to %d ms\n",
> > delay);
> > +
> > +               if (delay < 0)
> > +                       exit(1);
> > +
> > +               sprintf(delay_str, "%s\n", argv[1]);
> > +
> > +               if ((fd =
> > open(WORKLOAD_NOTIFICATION_DELAY_ATTRIBUTE,
> > O_RDWR)) < 0) {
> > +                       perror("Unable to open workload
> > notification
> > delay\n");
> > +                       exit(1);
> > +               }
> > +
> > +               if (write(fd, delay_str, strlen(delay_str)) < 0) {
> > +                       perror("Can't set delay\n");
> > +                       exit(1);
> > +               }
> > +
> > +               close(fd);
> > +
> > +       }
> > +
> > +       /* Enable feature via sysfs knob */
> > +       if ((fd = open(WORKLOAD_ENABLE_ATTRIBUTE, O_RDWR)) < 0) {
> > +               perror("Unable to open workload type feature enable
> > file\n");
> > +               exit(1);
> > +       }
> > +
> > +       if (write(fd, "1\n", 2) < 0) {
> > +               perror("Can' enable workload hints\n");
> > +               exit(1);
> > +       }
> > +
> > +       close(fd);
> 
> This enables WORKLOAD_ENABLE_ATTRIBUTE without disabling it again.
> As a test program, maybe we can add a timeout, and stop polling &
> disable the WORKLOAD_ENABLE_ATTRIBUTE after the timeout?
> 
We can or use signal to catch ctrl-c and do disable.

Thanks,
Srinivas

> thanks,
> rui
> > +
> > +       while (1) {
> > +               if ((fd = open(WORKLOAD_TYPE_INDEX_ATTRIBUTE,
> > O_RDONLY)) < 0) {
> > +                       perror("Unable to open workload type
> > file\n");
> > +                       exit(1);
> > +               }
> > +
> > +               if ((lseek(fd, 0L, SEEK_SET)) < 0) {
> > +                       fprintf(stderr, "Failed to set pointer to
> > beginning\n");
> > +                       exit(1);
> > +               }
> > +
> > +               if (read(fd, index_str, sizeof(index_str)) < 0) {
> > +                       fprintf(stderr, "Failed to read from:%s\n",
> > +                       WORKLOAD_TYPE_INDEX_ATTRIBUTE);
> > +                       exit(1);
> > +               }
> > +
> > +               ufd.fd = fd;
> > +               ufd.events = POLLPRI;
> > +
> > +               if ((ret = poll(&ufd, 1, -1)) < 0) {
> > +                       perror("poll error");
> > +                       exit(1);
> > +               } else if (ret == 0) {
> > +                       printf("Poll Timeout\n");
> > +               } else {
> > +                       if ((lseek(fd, 0L, SEEK_SET)) < 0) {
> > +                               fprintf(stderr, "Failed to set
> > pointer to beginning\n");
> > +                               exit(1);
> > +                       }
> > +
> > +                       if (read(fd, index_str, sizeof(index_str))
> > <
> > 0) {
> > +                               exit(0);
> > +                       }
> > +
> > +                       sscanf(index_str, "%d", &index);
> > +                       if (index > WORKLOAD_TYPE_MAX_INDEX)
> > +                               printf("Invalid workload type
> > index\n");
> > +                       else
> > +                               printf("workload type:%s\n",
> > workload_types[index]);
> > +               }
> > +
> > +               close(fd);
> > +       }
> > +}
>