diff options
| author | Nirmoy Das <nirmoy.das@intel.com> | 2023-09-28 15:00:12 +0200 |
|---|---|---|
| committer | Nirmoy Das <nirmoy.das@intel.com> | 2023-09-29 09:11:46 +0200 |
| commit | 42a71bbaeef2888d3c7a0fe2c7c23c2a399bbf41 (patch) | |
| tree | 2969645c701c3b975787b2a8abe3fac93ad56bff | |
| parent | 03d681412b38558aefe4fb0f46e36efa94bb21ef (diff) | |
drm/i915: Introduce intel_gt_mcr_lock_sanitize()
Implement intel_gt_mcr_lock_sanitize() to provide a mechanism
for cleaning the steer semaphore when absolutely necessary.
v2: remove unnecessary lock(Andi, Matt)
improve the kernel doc(Matt)
s/intel_gt_mcr_lock_clear/intel_gt_mcr_lock_sanitize
Signed-off-by: Nirmoy Das <nirmoy.das@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230928130015.6758-1-nirmoy.das@intel.com
| -rw-r--r-- | drivers/gpu/drm/i915/gt/intel_gt_mcr.c | 22 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/gt/intel_gt_mcr.h | 1 |
2 files changed, 23 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_mcr.c b/drivers/gpu/drm/i915/gt/intel_gt_mcr.c index bf4a933de03a..326c2ed1d99b 100644 --- a/drivers/gpu/drm/i915/gt/intel_gt_mcr.c +++ b/drivers/gpu/drm/i915/gt/intel_gt_mcr.c @@ -420,6 +420,28 @@ void intel_gt_mcr_unlock(struct intel_gt *gt, unsigned long flags) } /** + * intel_gt_mcr_lock_sanitize - Sanitize MCR steering lock + * @gt: GT structure + * + * This will be used to sanitize the initial status of the hardware lock + * during driver load and resume since there won't be any concurrent access + * from other agents at those times, but it's possible that boot firmware + * may have left the lock in a bad state. + * + */ +void intel_gt_mcr_lock_sanitize(struct intel_gt *gt) +{ + /* + * This gets called at load/resume time, so we shouldn't be + * racing with other driver threads grabbing the mcr lock. + */ + lockdep_assert_not_held(>->mcr_lock); + + if (GRAPHICS_VER_FULL(gt->i915) >= IP_VER(12, 70)) + intel_uncore_write_fw(gt->uncore, MTL_STEER_SEMAPHORE, 0x1); +} + +/** * intel_gt_mcr_read - read a specific instance of an MCR register * @gt: GT structure * @reg: the MCR register to read diff --git a/drivers/gpu/drm/i915/gt/intel_gt_mcr.h b/drivers/gpu/drm/i915/gt/intel_gt_mcr.h index 41684495b7da..01ac565a56a4 100644 --- a/drivers/gpu/drm/i915/gt/intel_gt_mcr.h +++ b/drivers/gpu/drm/i915/gt/intel_gt_mcr.h @@ -11,6 +11,7 @@ void intel_gt_mcr_init(struct intel_gt *gt); void intel_gt_mcr_lock(struct intel_gt *gt, unsigned long *flags); void intel_gt_mcr_unlock(struct intel_gt *gt, unsigned long flags); +void intel_gt_mcr_lock_sanitize(struct intel_gt *gt); u32 intel_gt_mcr_read(struct intel_gt *gt, i915_mcr_reg_t reg, |