Re: [PATCH v2 1/6] drm/i915/uncore: Convert gen6/gen7 read operations to fwtable

[Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxxxxxxx>]

On 10/09/2021 21:10, Matt Roper wrote:
> On gen6-gen8 (except vlv/chv) we don't use a forcewake lookup table; we
> simply check whether the register offset is < 0x40000, and return
> FORCEWAKE_RENDER if it is.  To prepare for upcoming refactoring, let's
> define a single-entry forcewake table from [0x0, 0x3ffff] and switch
> these platforms over to use the fwtable reader functions.
>
> v2:
>   - Drop __gen6_reg_read_fw_domains which is no longer used.  (Tvrtko)
>
> Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxxxxxxx>
> Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
> ---
>   drivers/gpu/drm/i915/intel_uncore.c | 21 ++++++++-------------
>   1 file changed, 8 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
> index f9767054dbdf..8c09af1e9f7a 100644
> --- a/drivers/gpu/drm/i915/intel_uncore.c
> +++ b/drivers/gpu/drm/i915/intel_uncore.c
> @@ -853,16 +853,6 @@ void assert_forcewakes_active(struct intel_uncore *uncore,
>   /* We give fast paths for the really cool registers */
>   #define NEEDS_FORCE_WAKE(reg) ((reg) < 0x40000)
>   
> -#define __gen6_reg_read_fw_domains(uncore, offset) \
> -({ \
> -	enum forcewake_domains __fwd; \
> -	if (NEEDS_FORCE_WAKE(offset)) \
> -		__fwd = FORCEWAKE_RENDER; \
> -	else \
> -		__fwd = 0; \
> -	__fwd; \
> -})
> -
>   static int fw_range_cmp(u32 offset, const struct intel_forcewake_range *entry)
>   {
>   	if (offset < entry->start)
> @@ -1064,6 +1054,10 @@ gen6_reg_write_fw_domains(struct intel_uncore *uncore, i915_reg_t reg)
>   	__fwd; \
>   })
>   
> +static const struct intel_forcewake_range __gen6_fw_ranges[] = {
> +	GEN_FW_RANGE(0x0, 0x3ffff, FORCEWAKE_RENDER),
> +};
> +
>   /* *Must* be sorted by offset ranges! See intel_fw_table_check(). */
>   static const struct intel_forcewake_range __chv_fw_ranges[] = {
>   	GEN_FW_RANGE(0x2000, 0x3fff, FORCEWAKE_RENDER),
> @@ -1623,7 +1617,6 @@ __gen_read(func, 64)
>   
>   __gen_reg_read_funcs(gen11_fwtable);
>   __gen_reg_read_funcs(fwtable);
> -__gen_reg_read_funcs(gen6);
>   
>   #undef __gen_reg_read_funcs
>   #undef GEN6_READ_FOOTER
> @@ -2111,15 +2104,17 @@ static int uncore_forcewake_init(struct intel_uncore *uncore)
>   		ASSIGN_WRITE_MMIO_VFUNCS(uncore, fwtable);
>   		ASSIGN_READ_MMIO_VFUNCS(uncore, fwtable);
>   	} else if (GRAPHICS_VER(i915) == 8) {
> +		ASSIGN_FW_DOMAINS_TABLE(uncore, __gen6_fw_ranges);
>   		ASSIGN_WRITE_MMIO_VFUNCS(uncore, gen8);
> -		ASSIGN_READ_MMIO_VFUNCS(uncore, gen6);
> +		ASSIGN_READ_MMIO_VFUNCS(uncore, fwtable);
>   	} else if (IS_VALLEYVIEW(i915)) {
>   		ASSIGN_FW_DOMAINS_TABLE(uncore, __vlv_fw_ranges);
>   		ASSIGN_WRITE_MMIO_VFUNCS(uncore, gen6);
>   		ASSIGN_READ_MMIO_VFUNCS(uncore, fwtable);
>   	} else if (IS_GRAPHICS_VER(i915, 6, 7)) {
> +		ASSIGN_FW_DOMAINS_TABLE(uncore, __gen6_fw_ranges);
>   		ASSIGN_WRITE_MMIO_VFUNCS(uncore, gen6);
> -		ASSIGN_READ_MMIO_VFUNCS(uncore, gen6);
> +		ASSIGN_READ_MMIO_VFUNCS(uncore, fwtable);
>   	}
>   
>   	uncore->pmic_bus_access_nb.notifier_call = i915_pmic_bus_access_notifier;

Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>

Regards,

Tvrtko