Re: [Intel-gfx] [PATCH v2 2/5] drm/i915/gt: Pass gt rather than uncore to lowest-level reads/writes

[Balasubramani Vivekanandan <balasubramani.vivekanandan@intel.com>]

On 28.11.2022 15:30, Matt Roper wrote:
> Passing the GT rather than uncore to the lowest level MCR read and write
> functions will make it easier to introduce dedicated MCR locking in a
> following patch.
> 
> Signed-off-by: Matt Roper <matthew.d.roper@intel.com>

Reviewed-by: Balasubramani Vivekanandan <balasubramani.vivekanandan@intel.com>

Regards,
Bala

> ---
>  drivers/gpu/drm/i915/gt/intel_gt_mcr.c | 18 ++++++++++--------
>  1 file changed, 10 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gt/intel_gt_mcr.c b/drivers/gpu/drm/i915/gt/intel_gt_mcr.c
> index ea86c1ab5dc5..f4484bb18ec9 100644
> --- a/drivers/gpu/drm/i915/gt/intel_gt_mcr.c
> +++ b/drivers/gpu/drm/i915/gt/intel_gt_mcr.c
> @@ -221,7 +221,7 @@ static i915_reg_t mcr_reg_cast(const i915_mcr_reg_t mcr)
>  
>  /*
>   * rw_with_mcr_steering_fw - Access a register with specific MCR steering
> - * @uncore: pointer to struct intel_uncore
> + * @gt: GT to read register from
>   * @reg: register being accessed
>   * @rw_flag: FW_REG_READ for read access or FW_REG_WRITE for write access
>   * @group: group number (documented as "sliceid" on older platforms)
> @@ -232,10 +232,11 @@ static i915_reg_t mcr_reg_cast(const i915_mcr_reg_t mcr)
>   *
>   * Caller needs to make sure the relevant forcewake wells are up.
>   */
> -static u32 rw_with_mcr_steering_fw(struct intel_uncore *uncore,
> +static u32 rw_with_mcr_steering_fw(struct intel_gt *gt,
>  				   i915_mcr_reg_t reg, u8 rw_flag,
>  				   int group, int instance, u32 value)
>  {
> +	struct intel_uncore *uncore = gt->uncore;
>  	u32 mcr_mask, mcr_ss, mcr, old_mcr, val = 0;
>  
>  	lockdep_assert_held(&uncore->lock);
> @@ -308,11 +309,12 @@ static u32 rw_with_mcr_steering_fw(struct intel_uncore *uncore,
>  	return val;
>  }
>  
> -static u32 rw_with_mcr_steering(struct intel_uncore *uncore,
> +static u32 rw_with_mcr_steering(struct intel_gt *gt,
>  				i915_mcr_reg_t reg, u8 rw_flag,
>  				int group, int instance,
>  				u32 value)
>  {
> +	struct intel_uncore *uncore = gt->uncore;
>  	enum forcewake_domains fw_domains;
>  	u32 val;
>  
> @@ -325,7 +327,7 @@ static u32 rw_with_mcr_steering(struct intel_uncore *uncore,
>  	spin_lock_irq(&uncore->lock);
>  	intel_uncore_forcewake_get__locked(uncore, fw_domains);
>  
> -	val = rw_with_mcr_steering_fw(uncore, reg, rw_flag, group, instance, value);
> +	val = rw_with_mcr_steering_fw(gt, reg, rw_flag, group, instance, value);
>  
>  	intel_uncore_forcewake_put__locked(uncore, fw_domains);
>  	spin_unlock_irq(&uncore->lock);
> @@ -347,7 +349,7 @@ u32 intel_gt_mcr_read(struct intel_gt *gt,
>  		      i915_mcr_reg_t reg,
>  		      int group, int instance)
>  {
> -	return rw_with_mcr_steering(gt->uncore, reg, FW_REG_READ, group, instance, 0);
> +	return rw_with_mcr_steering(gt, reg, FW_REG_READ, group, instance, 0);
>  }
>  
>  /**
> @@ -364,7 +366,7 @@ u32 intel_gt_mcr_read(struct intel_gt *gt,
>  void intel_gt_mcr_unicast_write(struct intel_gt *gt, i915_mcr_reg_t reg, u32 value,
>  				int group, int instance)
>  {
> -	rw_with_mcr_steering(gt->uncore, reg, FW_REG_WRITE, group, instance, value);
> +	rw_with_mcr_steering(gt, reg, FW_REG_WRITE, group, instance, value);
>  }
>  
>  /**
> @@ -588,7 +590,7 @@ u32 intel_gt_mcr_read_any_fw(struct intel_gt *gt, i915_mcr_reg_t reg)
>  	for (type = 0; type < NUM_STEERING_TYPES; type++) {
>  		if (reg_needs_read_steering(gt, reg, type)) {
>  			get_nonterminated_steering(gt, type, &group, &instance);
> -			return rw_with_mcr_steering_fw(gt->uncore, reg,
> +			return rw_with_mcr_steering_fw(gt, reg,
>  						       FW_REG_READ,
>  						       group, instance, 0);
>  		}
> @@ -615,7 +617,7 @@ u32 intel_gt_mcr_read_any(struct intel_gt *gt, i915_mcr_reg_t reg)
>  	for (type = 0; type < NUM_STEERING_TYPES; type++) {
>  		if (reg_needs_read_steering(gt, reg, type)) {
>  			get_nonterminated_steering(gt, type, &group, &instance);
> -			return rw_with_mcr_steering(gt->uncore, reg,
> +			return rw_with_mcr_steering(gt, reg,
>  						    FW_REG_READ,
>  						    group, instance, 0);
>  		}
> -- 
> 2.38.1
>