[PATCH 6/6] drm/i915/uc/gsc: Add a gsc_info debugfs

[Teres Alexis, Alan Previn]

On Fri, 2023-05-05 at 09:04 -0700, Ceraolo Spurio, Daniele wrote:
> Add a new debugfs to dump information about the GSC. This includes:
alan:snip
Actually everything looks good except for a couple of questions + asks - hope we can close on this patch in next rev.

> 
> - the FW path and SW tracking status;
> - the release, security and compatibility versions;
> - the HECI1 status registers.
> 
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_gsc_fw.c b/drivers/gpu/drm/i915/gt/uc/intel_gsc_fw.c
> index 0b6dcd982b14..3014e982aab2 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_gsc_fw.c
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_gsc_fw.c
> @@ -12,36 +12,31 @@
>  #include "intel_gsc_fw.h"
>  #include "intel_gsc_meu_headers.h"
>  #include "intel_gsc_uc_heci_cmd_submit.h"
> -
> -#define GSC_FW_STATUS_REG			_MMIO(0x116C40)
> -#define GSC_FW_CURRENT_STATE			REG_GENMASK(3, 0)
> -#define   GSC_FW_CURRENT_STATE_RESET		0
> -#define   GSC_FW_PROXY_STATE_NORMAL		5
> -#define GSC_FW_INIT_COMPLETE_BIT		REG_BIT(9)
> +#include "i915_reg.h"
>  
alan:snip
 
alan: btw, just to be consistent with other top-level "intel_foo_is..." checking functions,
why don't we take the runtime wakeref inside the following functions and make it easier for any callers?
(just like what we do for "intel_huc_is_authenticated"):
    static bool gsc_is_in_reset(struct intel_uncore *uncore)
    bool intel_gsc_uc_fw_proxy_init_done(struct intel_gsc_uc *gsc)
    bool intel_gsc_uc_fw_init_done(struct intel_gsc_uc *gsc)


> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_gsc_uc.c b/drivers/gpu/drm/i915/gt/uc/intel_gsc_uc.c
> index 2ae693b01b49..5475e95d61c6 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_gsc_uc.c
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_gsc_uc.c
> @@ -9,8 +9,9 @@
>  #include "gt/intel_gt_print.h"
>  #include "intel_gsc_uc.h"
alan: nit: not this patch's fault, alphabetically, intel_gsc_uc.h is after intel_gsc_proxy.h
>  #include "intel_gsc_fw.h"
> -#include "i915_drv.h"
>  #include "intel_gsc_proxy.h"
> +#include "i915_drv.h"
> +#include "i915_reg.h"
>  
>  static void gsc_work(struct work_struct *work)
>  {
> @@ -301,3 +302,46 @@ void intel_gsc_uc_load_start(struct intel_gsc_uc *gsc)
>   	queue_work(gsc->wq, &gsc->work);
>  }
> +
alan: btw, why are we putting intel_gsc_uc_load_status in intel_gsc_uc.c if the only caller is gsc_uc's debugfs?
why not just make it a static in there? unless u plan to call it from "err_print_uc" - then can we add that in next rev?

> +void intel_gsc_uc_load_status(struct intel_gsc_uc *gsc, struct drm_printer *p)
> +{
> +	struct intel_gt *gt = gsc_uc_to_gt(gsc);
> +	struct intel_uncore *uncore = gt->uncore;
> +	intel_wakeref_t wakeref;
> +
> +	if (!intel_gsc_uc_is_supported(gsc)) {
alan: this was already checked in caller so we'll never get here. i think we should remove the check in the caller, let below msg appear.
> +		drm_printf(p, "GSC not supported\n");
> +		return;
> +	}
alan:snip



> +			drm_printf(p, "HECI1 FWSTST%u = 0x%08x\n", i, status);
alan:nit: do you we could add those additional shim regs? (seemed useful in recent offline debugs).
alan:snip

> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_gsc_uc_debugfs.c b/drivers/gpu/drm/i915/gt/uc/intel_gsc_uc_debugfs.c
> new file mode 100644
> index 000000000000..da9f96b72291
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_gsc_uc_debugfs.c
> @@ -0,0 +1,38 @@
> +// SPDX-License-Identifier: MIT
> +/*
> + * Copyright © 2020 Intel Corporation
alan:2023?

alan:snip

> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_gsc_uc_debugfs.h b/drivers/gpu/drm/i915/gt/uc/intel_gsc_uc_debugfs.h
> new file mode 100644
> index 000000000000..c405e5574253
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_gsc_uc_debugfs.h
> @@ -0,0 +1,14 @@
> +/* SPDX-License-Identifier: MIT */
> +/*
> + * Copyright © 2020 Intel Corporation
alan:2023?
alan:snip

> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_huc.c b/drivers/gpu/drm/i915/gt/uc/intel_huc.c
alan:snip

 
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc_debugfs.c b/drivers/gpu/drm/i915/gt/uc/intel_uc_debugfs.c
> index 2f93cc4e408a..6d541c866edb 100644
alan:snip