[PATCH i-g-t] i915/guc: Disable i915_pm_rps when SLPC is enabled

[Vivi, Rodrigo]

On Thu, 2022-08-18 at 13:42 -0700, Vinay Belgaumkar wrote:
> These tests were specifically designed for host Turbo. Skip
> them when SLPC is enabled as they fail frequently. We will look
> to keep adding to SLPC test coverage with these scenarios.
> 
> Bug: https://gitlab.freedesktop.org/drm/intel/-/issues/3963
> Bug: https://gitlab.freedesktop.org/drm/intel/issues/4016
> Bug: https://gitlab.freedesktop.org/drm/intel/issues/5468
> Bug: https://gitlab.freedesktop.org/drm/intel/issues/5831
> 
> Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
> Signed-off-by: Vinay Belgaumkar <vinay.belgaumkar at intel.com>

Ideally we should add other api tests and cases to validate the
expected slpc flow.
But this could be done in a follow-up work since right now it is
important to merge
the fix for the performance regression without the ignore_efficient
freq.

So,
Reviewed-by: Rodrigo Vivi <rodrigo.vivi at intel.com>

> ---
>  lib/igt_pm.c             | 15 +++++++++++++++
>  lib/igt_pm.h             |  1 +
>  tests/i915/i915_pm_rps.c | 29 ++++++++++++++++++++++++-----
>  3 files changed, 40 insertions(+), 5 deletions(-)
> 
> diff --git a/lib/igt_pm.c b/lib/igt_pm.c
> index 6ebbad33..79bd6e2a 100644
> --- a/lib/igt_pm.c
> +++ b/lib/igt_pm.c
> @@ -1202,3 +1202,18 @@ void
> igt_pm_print_pci_card_runtime_status(void)
>                 igt_pm_print_pci_dev_runtime_status(__pci_dev_pwrattr
> [i].pci_dev);
>         }
>  }
> +
> +bool i915_is_slpc_enabled(int fd)
> +{
> +       int debugfs_fd = igt_debugfs_dir(fd);
> +       char buf[4096];
> +       int len;
> +
> +       igt_require(debugfs_fd != -1);
> +
> +       len = igt_debugfs_simple_read(debugfs_fd,
> "gt/uc/guc_slpc_info", buf, sizeof(buf));
> +       if (len < 0)
> +               return false;
> +       else
> +               return strstr(buf, "SLPC state: running");
> +}
> diff --git a/lib/igt_pm.h b/lib/igt_pm.h
> index f28b6ebf..cbbde12b 100644
> --- a/lib/igt_pm.h
> +++ b/lib/igt_pm.h
> @@ -79,5 +79,6 @@ void igt_pm_enable_pci_card_runtime_pm(struct
> pci_device *root,
>  void igt_pm_setup_pci_card_runtime_pm(struct pci_device *pci_dev);
>  void igt_pm_restore_pci_card_runtime_pm(void);
>  void igt_pm_print_pci_card_runtime_status(void);
> +bool i915_is_slpc_enabled(int fd);
>  
>  #endif /* IGT_PM_H */
> diff --git a/tests/i915/i915_pm_rps.c b/tests/i915/i915_pm_rps.c
> index d06ade27..cce07009 100644
> --- a/tests/i915/i915_pm_rps.c
> +++ b/tests/i915/i915_pm_rps.c
> @@ -914,35 +914,54 @@ igt_main
>                 igt_install_exit_handler(pm_rps_exit_handler);
>         }
>  
> -       igt_subtest("basic-api")
> +       igt_subtest("basic-api") {
> +               igt_skip_on_f(i915_is_slpc_enabled(drm_fd),
> +                             "This subtest is not supported when
> SLPC is enabled");
>                 min_max_config(basic_check, false);
> +       }
>  
>         /* Verify the constraints, check if we can reach idle */
> -       igt_subtest("min-max-config-idle")
> +       igt_subtest("min-max-config-idle") {
> +               igt_skip_on_f(i915_is_slpc_enabled(drm_fd),
> +                             "This subtest is not supported when
> SLPC is enabled");
>                 min_max_config(idle_check, true);
> +       }
>  
>         /* Verify the constraints with high load, check if we can
> reach max */
>         igt_subtest("min-max-config-loaded") {
> +               igt_skip_on_f(i915_is_slpc_enabled(drm_fd),
> +                             "This subtest is not supported when
> SLPC is enabled");
>                 load_helper_run(HIGH);
>                 min_max_config(loaded_check, false);
>                 load_helper_stop();
>         }
>  
>         /* Checks if we achieve boost using gem_wait */
> -       igt_subtest("waitboost")
> +       igt_subtest("waitboost") {
> +               igt_skip_on_f(i915_is_slpc_enabled(drm_fd),
> +                             "This subtest is not supported when
> SLPC is enabled");
>                 waitboost(drm_fd, false);
> +       }
>  
>         igt_describe("Check if the order of fences does not affect
> waitboosting");
> -       igt_subtest("fence-order")
> +       igt_subtest("fence-order") {
> +               igt_skip_on_f(i915_is_slpc_enabled(drm_fd),
> +                             "This subtest is not supported when
> SLPC is enabled");
>                 fence_order(drm_fd);
> +       }
>  
>         igt_describe("Check if context reuse does not affect
> waitboosting");
> -       igt_subtest("engine-order")
> +       igt_subtest("engine-order") {
> +               igt_skip_on_f(i915_is_slpc_enabled(drm_fd),
> +                             "This subtest is not supported when
> SLPC is enabled");
>                 engine_order(drm_fd);
> +       }
>  
>         /* Test boost frequency after GPU reset */
>         igt_subtest("reset") {
>                 igt_hang_t hang = igt_allow_hang(drm_fd, 0, 0);
> +               igt_skip_on_f(i915_is_slpc_enabled(drm_fd),
> +                             "This subtest is not supported when
> SLPC is enabled");
>                 waitboost(drm_fd, true);
>                 igt_disallow_hang(drm_fd, hang);
>         }