On Thu, Dec 08, 2016 at 03:02:19PM -0800, anushasr wrote:
> From: Peter Antoine <peter.antoine@xxxxxxxxx>
>
> This patch will allow for getparams to return the status of the HuC.
> As the HuC has to be validated by the GuC this patch uses the validated
> status to show when the HuC is loaded and ready for use. You cannot use
> the loaded status as with the GuC as the HuC is verified after it is
> loaded and is not usable until it is verified.
>
> v2: removed the forewakes as the registers are already force-woken.
> (T.Ursulin)
> v4: rebased.
> v5: rebased on top of drm-tip.
> v6: rebased. Removed any reference to intel_huc.h
>
> Signed-off-by: Peter Antoine <peter.antoine@xxxxxxxxx>
> Reviewed-by: Arkadiusz Hiler <arkadiusz.hiler@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_drv.c | 4 ++++
> drivers/gpu/drm/i915/intel_huc_loader.c | 12 ++++++++++++
> drivers/gpu/drm/i915/intel_uc.h | 1 +
> include/uapi/drm/i915_drm.h | 1 +
> 4 files changed, 18 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index 85a47c2..6be06a27 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -49,6 +49,7 @@
> #include "i915_trace.h"
> #include "i915_vgpu.h"
> #include "intel_drv.h"
> +#include "intel_uc.h"
>
> static struct drm_driver driver;
>
> @@ -349,6 +350,9 @@ static int i915_getparam(struct drm_device *dev, void *data,
> */
> value = 1;
> break;
> + case I915_PARAM_HAS_HUC:
> + value = intel_is_huc_valid(dev_priv);
> + break;
Why did you put it here? It breaks the pattern of case statements.
> default:
> DRM_DEBUG("Unknown parameter %d\n", param->param);
> return -EINVAL;
> diff --git a/drivers/gpu/drm/i915/intel_huc_loader.c b/drivers/gpu/drm/i915/intel_huc_loader.c
> index 96fc727..6704cc8 100644
> --- a/drivers/gpu/drm/i915/intel_huc_loader.c
> +++ b/drivers/gpu/drm/i915/intel_huc_loader.c
> @@ -289,3 +289,15 @@ void intel_huc_fini(struct drm_device *dev)
> huc_fw->fetch_status = UC_FIRMWARE_NONE;
> }
>
> +/**
> + * intel_is_huc_valid() - Check to see if the HuC is fully loaded.
> + * @dev_priv: drm device to check.
> + *
> + * This function will return true if the guc has been loaded and
> + * has valid firmware. The simplest way of doing this is to check
> + * if the HuC has been validated, if so it must have been loaded.
> + */
> +int intel_is_huc_valid(struct drm_i915_private *dev_priv)
bool
> +{
> + return ((I915_READ(HUC_STATUS2) & HUC_FW_VERIFIED) != 0);
(brackets (because (brackets)))
But what I really wanted to ask... Does this register access require the
device to be awake and powered?
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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