[PATCH v5 4/7] drm/i915/huc: differentiate the 2 steps of the MTL HuC auth flow
John Harrison
john.c.harrison at intel.com
Thu Jun 1 20:40:07 UTC 2023
On 5/31/2023 16:54, Daniele Ceraolo Spurio wrote:
> Before we add the second step of the MTL HuC auth (via GSC), we need to
> have the ability to differentiate between them. To do so, the huc
> authentication check is duplicated for GuC and GSC auth, with
> GSC-enabled binaries being considered fully authenticated only after
> the GSC auth step.
>
> To report the difference between the 2 auth steps, a new case is added
> to the HuC getparam. This way, the clear media driver can start
> submitting before full auth, as partial auth is enough for those
> workloads.
>
> v2: fix authentication status check for DG2
>
> v3: add a better comment at the top of the HuC file to explain the
> different approaches to load and auth (John)
>
> v4: update call to intel_huc_is_authenticated in the pxp code to check
> for GSC authentication
>
> v5: drop references to meu and esclamation mark in huc_auth print (John)
>
> Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
> Cc: Alan Previn <alan.previn.teres.alexis at intel.com>
> Cc: John Harrison <John.C.Harrison at Intel.com>
> Reviewed-by: Alan Previn <alan.previn.teres.alexis at intel.com> #v2
Reviewed-by: John Harrison <John.C.Harrison at Intel.com>
> ---
> drivers/gpu/drm/i915/gt/uc/intel_huc.c | 111 ++++++++++++++++-----
> drivers/gpu/drm/i915/gt/uc/intel_huc.h | 16 ++-
> drivers/gpu/drm/i915/gt/uc/intel_huc_fw.c | 4 +-
> drivers/gpu/drm/i915/i915_reg.h | 3 +
> drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.c | 2 +-
> include/uapi/drm/i915_drm.h | 3 +-
> 6 files changed, 104 insertions(+), 35 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_huc.c b/drivers/gpu/drm/i915/gt/uc/intel_huc.c
> index 27c5e41fa84c..73efdb027082 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_huc.c
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_huc.c
> @@ -10,6 +10,7 @@
> #include "intel_huc.h"
> #include "intel_huc_print.h"
> #include "i915_drv.h"
> +#include "i915_reg.h"
>
> #include <linux/device/bus.h>
> #include <linux/mei_aux.h>
> @@ -22,15 +23,23 @@
> * capabilities by adding HuC specific commands to batch buffers.
> *
> * The kernel driver is only responsible for loading the HuC firmware and
> - * triggering its security authentication, which is performed by the GuC on
> - * older platforms and by the GSC on newer ones. For the GuC to correctly
> - * perform the authentication, the HuC binary must be loaded before the GuC one.
> + * triggering its security authentication. This is done differently depending
> + * on the platform:
> + * - older platforms (from Gen9 to most Gen12s): the load is performed via DMA
> + * and the authentication via GuC
> + * - DG2: load and authentication are both performed via GSC.
> + * - MTL and newer platforms: the load is performed via DMA (same as with
> + * not-DG2 older platforms), while the authentication is done in 2-steps,
> + * a first auth for clear-media workloads via GuC and a second one for all
> + * workloads via GSC.
> + * On platforms where the GuC does the authentication, to correctly do so the
> + * HuC binary must be loaded before the GuC one.
> * Loading the HuC is optional; however, not using the HuC might negatively
> * impact power usage and/or performance of media workloads, depending on the
> * use-cases.
> * HuC must be reloaded on events that cause the WOPCM to lose its contents
> - * (S3/S4, FLR); GuC-authenticated HuC must also be reloaded on GuC/GT reset,
> - * while GSC-managed HuC will survive that.
> + * (S3/S4, FLR); on older platforms the HuC must also be reloaded on GuC/GT
> + * reset, while on newer ones it will survive that.
> *
> * See https://github.com/intel/media-driver for the latest details on HuC
> * functionality.
> @@ -106,7 +115,7 @@ static enum hrtimer_restart huc_delayed_load_timer_callback(struct hrtimer *hrti
> {
> struct intel_huc *huc = container_of(hrtimer, struct intel_huc, delayed_load.timer);
>
> - if (!intel_huc_is_authenticated(huc)) {
> + if (!intel_huc_is_authenticated(huc, INTEL_HUC_AUTH_BY_GSC)) {
> if (huc->delayed_load.status == INTEL_HUC_WAITING_ON_GSC)
> huc_notice(huc, "timed out waiting for MEI GSC\n");
> else if (huc->delayed_load.status == INTEL_HUC_WAITING_ON_PXP)
> @@ -124,7 +133,7 @@ static void huc_delayed_load_start(struct intel_huc *huc)
> {
> ktime_t delay;
>
> - GEM_BUG_ON(intel_huc_is_authenticated(huc));
> + GEM_BUG_ON(intel_huc_is_authenticated(huc, INTEL_HUC_AUTH_BY_GSC));
>
> /*
> * On resume we don't have to wait for MEI-GSC to be re-probed, but we
> @@ -284,13 +293,23 @@ void intel_huc_init_early(struct intel_huc *huc)
> }
>
> if (GRAPHICS_VER(i915) >= 11) {
> - huc->status.reg = GEN11_HUC_KERNEL_LOAD_INFO;
> - huc->status.mask = HUC_LOAD_SUCCESSFUL;
> - huc->status.value = HUC_LOAD_SUCCESSFUL;
> + huc->status[INTEL_HUC_AUTH_BY_GUC].reg = GEN11_HUC_KERNEL_LOAD_INFO;
> + huc->status[INTEL_HUC_AUTH_BY_GUC].mask = HUC_LOAD_SUCCESSFUL;
> + huc->status[INTEL_HUC_AUTH_BY_GUC].value = HUC_LOAD_SUCCESSFUL;
> } else {
> - huc->status.reg = HUC_STATUS2;
> - huc->status.mask = HUC_FW_VERIFIED;
> - huc->status.value = HUC_FW_VERIFIED;
> + huc->status[INTEL_HUC_AUTH_BY_GUC].reg = HUC_STATUS2;
> + huc->status[INTEL_HUC_AUTH_BY_GUC].mask = HUC_FW_VERIFIED;
> + huc->status[INTEL_HUC_AUTH_BY_GUC].value = HUC_FW_VERIFIED;
> + }
> +
> + if (IS_DG2(i915)) {
> + huc->status[INTEL_HUC_AUTH_BY_GSC].reg = GEN11_HUC_KERNEL_LOAD_INFO;
> + huc->status[INTEL_HUC_AUTH_BY_GSC].mask = HUC_LOAD_SUCCESSFUL;
> + huc->status[INTEL_HUC_AUTH_BY_GSC].value = HUC_LOAD_SUCCESSFUL;
> + } else {
> + huc->status[INTEL_HUC_AUTH_BY_GSC].reg = HECI_FWSTS5(MTL_GSC_HECI1_BASE);
> + huc->status[INTEL_HUC_AUTH_BY_GSC].mask = HECI_FWSTS5_HUC_AUTH_DONE;
> + huc->status[INTEL_HUC_AUTH_BY_GSC].value = HECI_FWSTS5_HUC_AUTH_DONE;
> }
> }
>
> @@ -397,28 +416,38 @@ void intel_huc_suspend(struct intel_huc *huc)
> delayed_huc_load_complete(huc);
> }
>
> -int intel_huc_wait_for_auth_complete(struct intel_huc *huc)
> +static const char *auth_mode_string(struct intel_huc *huc,
> + enum intel_huc_authentication_type type)
> +{
> + bool partial = huc->fw.has_gsc_headers && type == INTEL_HUC_AUTH_BY_GUC;
> +
> + return partial ? "clear media" : "all workloads";
> +}
> +
> +int intel_huc_wait_for_auth_complete(struct intel_huc *huc,
> + enum intel_huc_authentication_type type)
> {
> struct intel_gt *gt = huc_to_gt(huc);
> int ret;
>
> ret = __intel_wait_for_register(gt->uncore,
> - huc->status.reg,
> - huc->status.mask,
> - huc->status.value,
> + huc->status[type].reg,
> + huc->status[type].mask,
> + huc->status[type].value,
> 2, 50, NULL);
>
> /* mark the load process as complete even if the wait failed */
> delayed_huc_load_complete(huc);
>
> if (ret) {
> - huc_err(huc, "firmware not verified %pe\n", ERR_PTR(ret));
> + huc_err(huc, "firmware not verified for %s: %pe\n",
> + auth_mode_string(huc, type), ERR_PTR(ret));
> intel_uc_fw_change_status(&huc->fw, INTEL_UC_FIRMWARE_LOAD_FAIL);
> return ret;
> }
>
> intel_uc_fw_change_status(&huc->fw, INTEL_UC_FIRMWARE_RUNNING);
> - huc_info(huc, "authenticated!\n");
> + huc_info(huc, "authenticated for %s\n", auth_mode_string(huc, type));
> return 0;
> }
>
> @@ -458,7 +487,7 @@ int intel_huc_auth(struct intel_huc *huc)
> }
>
> /* Check authentication status, it should be done by now */
> - ret = intel_huc_wait_for_auth_complete(huc);
> + ret = intel_huc_wait_for_auth_complete(huc, INTEL_HUC_AUTH_BY_GUC);
> if (ret)
> goto fail;
>
> @@ -469,16 +498,29 @@ int intel_huc_auth(struct intel_huc *huc)
> return ret;
> }
>
> -bool intel_huc_is_authenticated(struct intel_huc *huc)
> +bool intel_huc_is_authenticated(struct intel_huc *huc,
> + enum intel_huc_authentication_type type)
> {
> struct intel_gt *gt = huc_to_gt(huc);
> intel_wakeref_t wakeref;
> u32 status = 0;
>
> with_intel_runtime_pm(gt->uncore->rpm, wakeref)
> - status = intel_uncore_read(gt->uncore, huc->status.reg);
> + status = intel_uncore_read(gt->uncore, huc->status[type].reg);
>
> - return (status & huc->status.mask) == huc->status.value;
> + return (status & huc->status[type].mask) == huc->status[type].value;
> +}
> +
> +static bool huc_is_fully_authenticated(struct intel_huc *huc)
> +{
> + struct intel_uc_fw *huc_fw = &huc->fw;
> +
> + if (!huc_fw->has_gsc_headers)
> + return intel_huc_is_authenticated(huc, INTEL_HUC_AUTH_BY_GUC);
> + else if (intel_huc_is_loaded_by_gsc(huc) || HAS_ENGINE(huc_to_gt(huc), GSC0))
> + return intel_huc_is_authenticated(huc, INTEL_HUC_AUTH_BY_GSC);
> + else
> + return false;
> }
>
> /**
> @@ -493,7 +535,9 @@ bool intel_huc_is_authenticated(struct intel_huc *huc)
> */
> int intel_huc_check_status(struct intel_huc *huc)
> {
> - switch (__intel_uc_fw_status(&huc->fw)) {
> + struct intel_uc_fw *huc_fw = &huc->fw;
> +
> + switch (__intel_uc_fw_status(huc_fw)) {
> case INTEL_UC_FIRMWARE_NOT_SUPPORTED:
> return -ENODEV;
> case INTEL_UC_FIRMWARE_DISABLED:
> @@ -510,7 +554,17 @@ int intel_huc_check_status(struct intel_huc *huc)
> break;
> }
>
> - return intel_huc_is_authenticated(huc);
> + /*
> + * GSC-enabled binaries loaded via DMA are first partially
> + * authenticated by GuC and then fully authenticated by GSC
> + */
> + if (huc_is_fully_authenticated(huc))
> + return 1; /* full auth */
> + else if (huc_fw->has_gsc_headers && !intel_huc_is_loaded_by_gsc(huc) &&
> + intel_huc_is_authenticated(huc, INTEL_HUC_AUTH_BY_GUC))
> + return 2; /* clear media only */
> + else
> + return 0;
> }
>
> static bool huc_has_delayed_load(struct intel_huc *huc)
> @@ -524,7 +578,10 @@ void intel_huc_update_auth_status(struct intel_huc *huc)
> if (!intel_uc_fw_is_loadable(&huc->fw))
> return;
>
> - if (intel_huc_is_authenticated(huc))
> + if (!huc->fw.has_gsc_headers)
> + return;
> +
> + if (huc_is_fully_authenticated(huc))
> intel_uc_fw_change_status(&huc->fw,
> INTEL_UC_FIRMWARE_RUNNING);
> else if (huc_has_delayed_load(huc))
> @@ -557,5 +614,5 @@ void intel_huc_load_status(struct intel_huc *huc, struct drm_printer *p)
>
> with_intel_runtime_pm(gt->uncore->rpm, wakeref)
> drm_printf(p, "HuC status: 0x%08x\n",
> - intel_uncore_read(gt->uncore, huc->status.reg));
> + intel_uncore_read(gt->uncore, huc->status[INTEL_HUC_AUTH_BY_GUC].reg));
> }
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_huc.h b/drivers/gpu/drm/i915/gt/uc/intel_huc.h
> index 112f0dce4702..3f6aa7c37abc 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_huc.h
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_huc.h
> @@ -22,6 +22,12 @@ enum intel_huc_delayed_load_status {
> INTEL_HUC_DELAYED_LOAD_ERROR,
> };
>
> +enum intel_huc_authentication_type {
> + INTEL_HUC_AUTH_BY_GUC = 0,
> + INTEL_HUC_AUTH_BY_GSC,
> + INTEL_HUC_AUTH_MAX_MODES
> +};
> +
> struct intel_huc {
> /* Generic uC firmware management */
> struct intel_uc_fw fw;
> @@ -31,7 +37,7 @@ struct intel_huc {
> i915_reg_t reg;
> u32 mask;
> u32 value;
> - } status;
> + } status[INTEL_HUC_AUTH_MAX_MODES];
>
> struct {
> struct i915_sw_fence fence;
> @@ -49,10 +55,12 @@ int intel_huc_init(struct intel_huc *huc);
> void intel_huc_fini(struct intel_huc *huc);
> void intel_huc_suspend(struct intel_huc *huc);
> int intel_huc_auth(struct intel_huc *huc);
> -int intel_huc_wait_for_auth_complete(struct intel_huc *huc);
> +int intel_huc_wait_for_auth_complete(struct intel_huc *huc,
> + enum intel_huc_authentication_type type);
> +bool intel_huc_is_authenticated(struct intel_huc *huc,
> + enum intel_huc_authentication_type type);
> int intel_huc_check_status(struct intel_huc *huc);
> void intel_huc_update_auth_status(struct intel_huc *huc);
> -bool intel_huc_is_authenticated(struct intel_huc *huc);
>
> void intel_huc_register_gsc_notifier(struct intel_huc *huc, const struct bus_type *bus);
> void intel_huc_unregister_gsc_notifier(struct intel_huc *huc, const struct bus_type *bus);
> @@ -81,7 +89,7 @@ static inline bool intel_huc_is_loaded_by_gsc(const struct intel_huc *huc)
> static inline bool intel_huc_wait_required(struct intel_huc *huc)
> {
> return intel_huc_is_used(huc) && intel_huc_is_loaded_by_gsc(huc) &&
> - !intel_huc_is_authenticated(huc);
> + !intel_huc_is_authenticated(huc, INTEL_HUC_AUTH_BY_GSC);
> }
>
> void intel_huc_load_status(struct intel_huc *huc, struct drm_printer *p);
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_huc_fw.c b/drivers/gpu/drm/i915/gt/uc/intel_huc_fw.c
> index 89a887d33b77..ac2ae5f5011e 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_huc_fw.c
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_huc_fw.c
> @@ -161,7 +161,7 @@ int intel_huc_fw_load_and_auth_via_gsc(struct intel_huc *huc)
> * component gets re-bound and this function called again. If so, just
> * mark the HuC as loaded.
> */
> - if (intel_huc_is_authenticated(huc)) {
> + if (intel_huc_is_authenticated(huc, INTEL_HUC_AUTH_BY_GSC)) {
> intel_uc_fw_change_status(&huc->fw, INTEL_UC_FIRMWARE_RUNNING);
> return 0;
> }
> @@ -174,7 +174,7 @@ int intel_huc_fw_load_and_auth_via_gsc(struct intel_huc *huc)
>
> intel_uc_fw_change_status(&huc->fw, INTEL_UC_FIRMWARE_TRANSFERRED);
>
> - return intel_huc_wait_for_auth_complete(huc);
> + return intel_huc_wait_for_auth_complete(huc, INTEL_HUC_AUTH_BY_GSC);
> }
>
> /**
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 0523418129c5..8ed7c39c2b30 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -941,6 +941,9 @@
> #define HECI_H_GS1(base) _MMIO((base) + 0xc4c)
> #define HECI_H_GS1_ER_PREP REG_BIT(0)
>
> +#define HECI_FWSTS5(base) _MMIO((base) + 0xc68)
> +#define HECI_FWSTS5_HUC_AUTH_DONE (1 << 19)
> +
> #define HSW_GTT_CACHE_EN _MMIO(0x4024)
> #define GTT_CACHE_EN_ALL 0xF0007FFF
> #define GEN7_WR_WATERMARK _MMIO(0x4028)
> diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.c b/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.c
> index 8dc41de3f6f7..016bd8fad89d 100644
> --- a/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.c
> +++ b/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.c
> @@ -196,7 +196,7 @@ bool intel_pxp_gsccs_is_ready_for_sessions(struct intel_pxp *pxp)
> * gsc-proxy init flow (the last set of dependencies that
> * are out of order) will suffice.
> */
> - if (intel_huc_is_authenticated(&pxp->ctrl_gt->uc.huc) &&
> + if (intel_huc_is_authenticated(&pxp->ctrl_gt->uc.huc, INTEL_HUC_AUTH_BY_GSC) &&
> intel_gsc_uc_fw_proxy_init_done(&pxp->ctrl_gt->uc.gsc))
> return true;
>
> diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
> index f31dfacde601..a1848e806059 100644
> --- a/include/uapi/drm/i915_drm.h
> +++ b/include/uapi/drm/i915_drm.h
> @@ -674,7 +674,8 @@ typedef struct drm_i915_irq_wait {
> * If the IOCTL is successful, the returned parameter will be set to one of the
> * following values:
> * * 0 if HuC firmware load is not complete,
> - * * 1 if HuC firmware is authenticated and running.
> + * * 1 if HuC firmware is loaded and fully authenticated,
> + * * 2 if HuC firmware is loaded and authenticated for clear media only
> */
> #define I915_PARAM_HUC_STATUS 42
>
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