diff options
Diffstat (limited to 'drivers/gpu/drm/i915/gt/uc/intel_uc.h')
| -rw-r--r-- | drivers/gpu/drm/i915/gt/uc/intel_uc.h | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc.h b/drivers/gpu/drm/i915/gt/uc/intel_uc.h index 2ce993ceb60a..a41aaf353f88 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_uc.h +++ b/drivers/gpu/drm/i915/gt/uc/intel_uc.h @@ -40,6 +40,27 @@ void intel_uc_runtime_suspend(struct intel_uc *uc); int intel_uc_resume(struct intel_uc *uc); int intel_uc_runtime_resume(struct intel_uc *uc); +/* + * We need to know as early as possible if we're going to use GuC or not to + * take the correct setup paths. Additionally, once we've started loading the + * GuC, it is unsafe to keep executing without it because some parts of the HW, + * a subset of which is not cleaned on GT reset, will start expecting the GuC FW + * to be running. + * To solve both these requirements, we commit to using the microcontrollers if + * the relevant modparam is set and the blobs are found on the system. At this + * stage, the only thing that can stop us from attempting to load the blobs on + * the HW and use them is a fundamental issue (e.g. no memory for our + * structures); if we hit such a problem during driver load we're broken even + * without GuC, so there is no point in trying to fall back. + * + * Given the above, we can be in one of 4 states, with the last one implying + * we're committed to using the microcontroller: + * - Not supported: not available in HW and/or firmware not defined. + * - Supported: available in HW and firmware defined. + * - Wanted: supported + enabled in modparam. + * - In use: wanted + firmware found on the system and successfully fetched. + */ + #define __uc_state_checker(x, state, required) \ static inline bool intel_uc_##state##_##x(struct intel_uc *uc) \ { \ @@ -48,7 +69,8 @@ static inline bool intel_uc_##state##_##x(struct intel_uc *uc) \ #define uc_state_checkers(x) \ __uc_state_checker(x, supports, supported) \ -__uc_state_checker(x, uses, enabled) +__uc_state_checker(x, wants, wanted) \ +__uc_state_checker(x, uses, used) uc_state_checkers(guc); uc_state_checkers(huc); |