Re: [Intel-gfx] [PATCH 5/6] drm/i915/uncore: Drop gen11 mmio read handlers

[Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxxxxxxx>]

On 10/09/2021 06:33, Matt Roper wrote:
> Consolidate down to just a single 'fwtable' implementation.  For reads
> we don't need to worry about shadow tables.  Also, the
> NEEDS_FORCE_WAKE() check we previously had in the fwtable implementation
> can be dropped --- if a register is outside that range on one of the old
> platforms, then it won't belong to any forcewake range and 0 will be
> returned anyway.
>
> Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
> ---
>   drivers/gpu/drm/i915/intel_uncore.c | 45 +++++++++++------------------
>   1 file changed, 17 insertions(+), 28 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
> index c181e74fbf43..95398cb69722 100644
> --- a/drivers/gpu/drm/i915/intel_uncore.c
> +++ b/drivers/gpu/drm/i915/intel_uncore.c
> @@ -935,14 +935,6 @@ static const struct intel_forcewake_range __vlv_fw_ranges[] = {
>   };
>   
>   #define __fwtable_reg_read_fw_domains(uncore, offset) \
> -({ \
> -	enum forcewake_domains __fwd = 0; \
> -	if (NEEDS_FORCE_WAKE((offset))) \
> -		__fwd = find_fw_domain(uncore, offset); \
> -	__fwd; \
> -})
> -
> -#define __gen11_fwtable_reg_read_fw_domains(uncore, offset) \
>   	find_fw_domain(uncore, offset)

Looks like you can drop this macro and just call find_fw_domain or you 
think there is value to keep it?

Regards,

Tvrtko

>   
>   /* *Must* be sorted by offset! See intel_shadow_table_check(). */
> @@ -1577,33 +1569,30 @@ static inline void __force_wake_auto(struct intel_uncore *uncore,
>   		___force_wake_auto(uncore, fw_domains);
>   }
>   
> -#define __gen_read(func, x) \
> +#define __gen_fwtable_read(x) \
>   static u##x \
> -func##_read##x(struct intel_uncore *uncore, i915_reg_t reg, bool trace) { \
> +fwtable_read##x(struct intel_uncore *uncore, i915_reg_t reg, bool trace) \
> +{ \
>   	enum forcewake_domains fw_engine; \
>   	GEN6_READ_HEADER(x); \
> -	fw_engine = __##func##_reg_read_fw_domains(uncore, offset); \
> +	fw_engine = __fwtable_reg_read_fw_domains(uncore, offset); \
>   	if (fw_engine) \
>   		__force_wake_auto(uncore, fw_engine); \
>   	val = __raw_uncore_read##x(uncore, reg); \
>   	GEN6_READ_FOOTER; \
>   }
>   
> -#define __gen_reg_read_funcs(func) \
> -static enum forcewake_domains \
> -func##_reg_read_fw_domains(struct intel_uncore *uncore, i915_reg_t reg) { \
> -	return __##func##_reg_read_fw_domains(uncore, i915_mmio_reg_offset(reg)); \
> -} \
> -\
> -__gen_read(func, 8) \
> -__gen_read(func, 16) \
> -__gen_read(func, 32) \
> -__gen_read(func, 64)
> +static enum forcewake_domains
> +fwtable_reg_read_fw_domains(struct intel_uncore *uncore, i915_reg_t reg) {
> +	return __fwtable_reg_read_fw_domains(uncore, i915_mmio_reg_offset(reg));
> +}
>   
> -__gen_reg_read_funcs(gen11_fwtable);
> -__gen_reg_read_funcs(fwtable);
> +__gen_fwtable_read(8)
> +__gen_fwtable_read(16)
> +__gen_fwtable_read(32)
> +__gen_fwtable_read(64)
>   
> -#undef __gen_reg_read_funcs
> +#undef __gen_fwtable_read
>   #undef GEN6_READ_FOOTER
>   #undef GEN6_READ_HEADER
>   
> @@ -2069,22 +2058,22 @@ static int uncore_forcewake_init(struct intel_uncore *uncore)
>   		ASSIGN_FW_DOMAINS_TABLE(uncore, __dg2_fw_ranges);
>   		ASSIGN_SHADOW_TABLE(uncore, gen12_shadowed_regs);
>   		ASSIGN_WRITE_MMIO_VFUNCS(uncore, fwtable);
> -		ASSIGN_READ_MMIO_VFUNCS(uncore, gen11_fwtable);
> +		ASSIGN_READ_MMIO_VFUNCS(uncore, fwtable);
>   	} else if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 50)) {
>   		ASSIGN_FW_DOMAINS_TABLE(uncore, __xehp_fw_ranges);
>   		ASSIGN_SHADOW_TABLE(uncore, gen12_shadowed_regs);
>   		ASSIGN_WRITE_MMIO_VFUNCS(uncore, fwtable);
> -		ASSIGN_READ_MMIO_VFUNCS(uncore, gen11_fwtable);
> +		ASSIGN_READ_MMIO_VFUNCS(uncore, fwtable);
>   	} else if (GRAPHICS_VER(i915) >= 12) {
>   		ASSIGN_FW_DOMAINS_TABLE(uncore, __gen12_fw_ranges);
>   		ASSIGN_SHADOW_TABLE(uncore, gen12_shadowed_regs);
>   		ASSIGN_WRITE_MMIO_VFUNCS(uncore, fwtable);
> -		ASSIGN_READ_MMIO_VFUNCS(uncore, gen11_fwtable);
> +		ASSIGN_READ_MMIO_VFUNCS(uncore, fwtable);
>   	} else if (GRAPHICS_VER(i915) == 11) {
>   		ASSIGN_FW_DOMAINS_TABLE(uncore, __gen11_fw_ranges);
>   		ASSIGN_SHADOW_TABLE(uncore, gen11_shadowed_regs);
>   		ASSIGN_WRITE_MMIO_VFUNCS(uncore, fwtable);
> -		ASSIGN_READ_MMIO_VFUNCS(uncore, gen11_fwtable);
> +		ASSIGN_READ_MMIO_VFUNCS(uncore, fwtable);
>   	} else if (IS_GRAPHICS_VER(i915, 9, 10)) {
>   		ASSIGN_FW_DOMAINS_TABLE(uncore, __gen9_fw_ranges);
>   		ASSIGN_SHADOW_TABLE(uncore, gen8_shadowed_regs);