On Wed, Mar 13, 2019 at 11:02:18PM +0530, Anshuman Gupta wrote:
> From: Jyoti Yadav <jyoti.r.yadav@xxxxxxxxx>
>
> dmc_loaded() will be used by new test i915_pm_dc.c which will validate
> Display C States. So moving the same to igt_pm library.
> Introduced igt_disable_runtime_pm() inorder to disable runtime suspend
> for the function which support dc9.
>
> v2: Simplify the comment section.
> v3: Remove . from the subject line.
> v4: Rebased, resolve conflicts in pm_rpm.c
> Included patch set version change log.
> v5: Listing actual change in patch set changelog to make review easier.
> v6: igt's lib added support for disabling runtime suspend, change in commit log.
> rebased due to test name pm_rpm changed to i915_pm_rpm.
>
> Signed-off-by: Jyoti Yadav <jyoti.r.yadav@xxxxxxxxx>
> Signed-off-by: Anshuman Gupta <anshuman.gupta@xxxxxxxxx>
> ---
> lib/igt_pm.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
> lib/igt_pm.h | 2 ++
> tests/i915/i915_pm_rpm.c | 17 +----------------
> 3 files changed, 50 insertions(+), 16 deletions(-)
>
> diff --git a/lib/igt_pm.c b/lib/igt_pm.c
> index 4902723..0ed566f 100644
> --- a/lib/igt_pm.c
> +++ b/lib/igt_pm.c
> @@ -38,6 +38,7 @@
> #include "drmtest.h"
> #include "igt_pm.h"
> #include "igt_aux.h"
> +#include "igt_sysfs.h"
>
> /**
> * SECTION:igt_pm
> @@ -486,6 +487,7 @@ void igt_restore_runtime_pm(void)
> igt_pm_audio_restore_runtime_pm();
> }
>
> +
Extra w/s.
> static void __igt_pm_runtime_exit_handler(int sig)
> {
> __igt_restore_runtime_pm();
> @@ -577,6 +579,24 @@ bool igt_setup_runtime_pm(void)
> return true;
> }
>
> +bool igt_disable_runtime_pm(void)
> +{
> + int fd;
> + ssize_t size;
> + char buf[6];
> +
This being a library function it should make sure that the original
value of POWER_DIR/control has been saved. For instance by asserting
that igt_setup_runtime_pm() has been called previously.
> + /* We know we support runtime PM, let's try to disable it now. */
> + fd = open(POWER_DIR "/control", O_RDWR);
> + igt_assert_f(fd >= 0, "Can't open " POWER_DIR "/control\n");
> + size = write(fd, "on\n", 3);
> + igt_assert(size == 3);
> + lseek(fd, 0, SEEK_SET);
> + size = read(fd, buf, ARRAY_SIZE(buf));
> + igt_assert(size == 3);
> + igt_assert(strncmp(buf, "on\n", 3) == 0);
> + close(fd);
> + return true;
> +}
> /**
> * igt_get_runtime_pm_status:
> *
> @@ -620,3 +640,30 @@ bool igt_wait_for_pm_status(enum igt_runtime_pm_status status)
> {
> return igt_wait(igt_get_runtime_pm_status() == status, 10000, 100);
> }
> +
> +/**
> + * dmc_loaded:
> + * @debugfs: fd to the debugfs dir.
> +
> + * Check whether DMC FW is loaded or not. DMC FW is require for few Display C
> + * states like DC5 and DC6. FW does the Context Save and Restore during Display
> + * C States entry and exit.
> + *
> + * Returns:
> + * True if DMC FW is loaded otherwise false.
> + */
> +bool igt_pm_dmc_loaded(int debugfs)
> +{
> + igt_require(debugfs != -1);
> + char buf[15];
> + int len;
> +
> + len = igt_sysfs_read(debugfs, "i915_dmc_info", buf, sizeof(buf) - 1);
> + if (len < 0)
> + return true; /* no CSR support, no DMC requirement */
> +
> + buf[len] = '\0';
> +
> + igt_info("DMC: %s\n", buf);
> + return strstr(buf, "fw loaded: yes");
> +}
> diff --git a/lib/igt_pm.h b/lib/igt_pm.h
> index 10cc679..6c4617a 100644
> --- a/lib/igt_pm.h
> +++ b/lib/igt_pm.h
> @@ -47,8 +47,10 @@ enum igt_runtime_pm_status {
> };
>
> bool igt_setup_runtime_pm(void);
> +bool igt_disable_runtime_pm(void);
> void igt_restore_runtime_pm(void);
> enum igt_runtime_pm_status igt_get_runtime_pm_status(void);
> bool igt_wait_for_pm_status(enum igt_runtime_pm_status status);
> +bool igt_pm_dmc_loaded(int debugfs);
>
> #endif /* IGT_PM_H */
> diff --git a/tests/i915/i915_pm_rpm.c b/tests/i915/i915_pm_rpm.c
> index be296f5..2d7cb5e 100644
> --- a/tests/i915/i915_pm_rpm.c
> +++ b/tests/i915/i915_pm_rpm.c
> @@ -710,21 +710,6 @@ static void setup_pc8(void)
> has_pc8 = true;
> }
>
> -static bool dmc_loaded(void)
> -{
> - char buf[15];
> - int len;
> -
> - len = igt_sysfs_read(debugfs, "i915_dmc_info", buf, sizeof(buf) - 1);
> - if (len < 0)
> - return true; /* no CSR support, no DMC requirement */
> -
> - buf[len] = '\0';
> -
> - igt_info("DMC: %s\n", buf);
> - return strstr(buf, "fw loaded: yes");
> -}
> -
> static void dump_file(int dir, const char *filename)
> {
> char *contents;
> @@ -761,7 +746,7 @@ static bool setup_environment(void)
> igt_info("Runtime PM support: %d\n", has_runtime_pm);
> igt_info("PC8 residency support: %d\n", has_pc8);
> igt_require(has_runtime_pm);
> - igt_require(dmc_loaded());
> + igt_require(igt_pm_dmc_loaded(debugfs));
>
> out:
> disable_all_screens(&ms_data);
> --
> 2.7.4
>
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