linux-kernel - Re: [PATCH v2 2/2] net: ipa: fix v3.1 resource limit masks

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Message-ID: <1b3438b9c5c33eeae0f648843ab0eb10@somainline.org>
Date:   Tue, 25 Oct 2022 23:03:07 +0300
From:   Jami Kettunen <jami.kettunen@...ainline.org>
To:     Caleb Connolly <caleb.connolly@...aro.org>
Cc:     Alex Elder <elder@...aro.org>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Alex Elder <elder@...nel.org>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v2 2/2] net: ipa: fix v3.1 resource limit masks

On 25.10.2022 00:03, Caleb Connolly wrote:
> The resource group limits for IPA v3.1 mistakenly used 6 bit wide mask
> values, when the hardware actually uses 8. Out of range values were
> silently ignored before, so the IPA worked as expected. However the
> new generalised register definitions introduce stricter checking here,
> they now cause some splats and result in the value 0 being written
> instead. Fix the limit bitmask widths so that the correct values can be
> written.
> 
> Fixes: 1c418c4a929c ("net: ipa: define resource group/type IPA register 
> fields")
> Signed-off-by: Caleb Connolly <caleb.connolly@...aro.org>

Tested-by: Jami Kettunen <jami.kettunen@...ainline.org>

> ---
>  drivers/net/ipa/reg/ipa_reg-v3.1.c | 96 ++++++++++--------------------
>  1 file changed, 32 insertions(+), 64 deletions(-)
> 
> diff --git a/drivers/net/ipa/reg/ipa_reg-v3.1.c
> b/drivers/net/ipa/reg/ipa_reg-v3.1.c
> index 116b27717e3d..0d002c3c38a2 100644
> --- a/drivers/net/ipa/reg/ipa_reg-v3.1.c
> +++ b/drivers/net/ipa/reg/ipa_reg-v3.1.c
> @@ -127,112 +127,80 @@ static const u32 ipa_reg_counter_cfg_fmask[] = {
>  IPA_REG_FIELDS(COUNTER_CFG, counter_cfg, 0x000001f0);
> 
>  static const u32 ipa_reg_src_rsrc_grp_01_rsrc_type_fmask[] = {
> -	[X_MIN_LIM]					= GENMASK(5, 0),
> -						/* Bits 6-7 reserved */
> -	[X_MAX_LIM]					= GENMASK(13, 8),
> -						/* Bits 14-15 reserved */
> -	[Y_MIN_LIM]					= GENMASK(21, 16),
> -						/* Bits 22-23 reserved */
> -	[Y_MAX_LIM]					= GENMASK(29, 24),
> -						/* Bits 30-31 reserved */
> +	[X_MIN_LIM]					= GENMASK(7, 0),
> +	[X_MAX_LIM]					= GENMASK(15, 8),
> +	[Y_MIN_LIM]					= GENMASK(23, 16),
> +	[Y_MAX_LIM]					= GENMASK(31, 24),
>  };
> 
>  IPA_REG_STRIDE_FIELDS(SRC_RSRC_GRP_01_RSRC_TYPE, 
> src_rsrc_grp_01_rsrc_type,
>  		      0x00000400, 0x0020);
> 
>  static const u32 ipa_reg_src_rsrc_grp_23_rsrc_type_fmask[] = {
> -	[X_MIN_LIM]					= GENMASK(5, 0),
> -						/* Bits 6-7 reserved */
> -	[X_MAX_LIM]					= GENMASK(13, 8),
> -						/* Bits 14-15 reserved */
> -	[Y_MIN_LIM]					= GENMASK(21, 16),
> -						/* Bits 22-23 reserved */
> -	[Y_MAX_LIM]					= GENMASK(29, 24),
> -						/* Bits 30-31 reserved */
> +	[X_MIN_LIM]					= GENMASK(7, 0),
> +	[X_MAX_LIM]					= GENMASK(15, 8),
> +	[Y_MIN_LIM]					= GENMASK(23, 16),
> +	[Y_MAX_LIM]					= GENMASK(31, 24),
>  };
> 
>  IPA_REG_STRIDE_FIELDS(SRC_RSRC_GRP_23_RSRC_TYPE, 
> src_rsrc_grp_23_rsrc_type,
>  		      0x00000404, 0x0020);
> 
>  static const u32 ipa_reg_src_rsrc_grp_45_rsrc_type_fmask[] = {
> -	[X_MIN_LIM]					= GENMASK(5, 0),
> -						/* Bits 6-7 reserved */
> -	[X_MAX_LIM]					= GENMASK(13, 8),
> -						/* Bits 14-15 reserved */
> -	[Y_MIN_LIM]					= GENMASK(21, 16),
> -						/* Bits 22-23 reserved */
> -	[Y_MAX_LIM]					= GENMASK(29, 24),
> -						/* Bits 30-31 reserved */
> +	[X_MIN_LIM]					= GENMASK(7, 0),
> +	[X_MAX_LIM]					= GENMASK(15, 8),
> +	[Y_MIN_LIM]					= GENMASK(23, 16),
> +	[Y_MAX_LIM]					= GENMASK(31, 24),
>  };
> 
>  IPA_REG_STRIDE_FIELDS(SRC_RSRC_GRP_45_RSRC_TYPE, 
> src_rsrc_grp_45_rsrc_type,
>  		      0x00000408, 0x0020);
> 
>  static const u32 ipa_reg_src_rsrc_grp_67_rsrc_type_fmask[] = {
> -	[X_MIN_LIM]					= GENMASK(5, 0),
> -						/* Bits 6-7 reserved */
> -	[X_MAX_LIM]					= GENMASK(13, 8),
> -						/* Bits 14-15 reserved */
> -	[Y_MIN_LIM]					= GENMASK(21, 16),
> -						/* Bits 22-23 reserved */
> -	[Y_MAX_LIM]					= GENMASK(29, 24),
> -						/* Bits 30-31 reserved */
> +	[X_MIN_LIM]					= GENMASK(7, 0),
> +	[X_MAX_LIM]					= GENMASK(15, 8),
> +	[Y_MIN_LIM]					= GENMASK(23, 16),
> +	[Y_MAX_LIM]					= GENMASK(31, 24),
>  };
> 
>  IPA_REG_STRIDE_FIELDS(SRC_RSRC_GRP_67_RSRC_TYPE, 
> src_rsrc_grp_67_rsrc_type,
>  		      0x0000040c, 0x0020);
> 
>  static const u32 ipa_reg_dst_rsrc_grp_01_rsrc_type_fmask[] = {
> -	[X_MIN_LIM]					= GENMASK(5, 0),
> -						/* Bits 6-7 reserved */
> -	[X_MAX_LIM]					= GENMASK(13, 8),
> -						/* Bits 14-15 reserved */
> -	[Y_MIN_LIM]					= GENMASK(21, 16),
> -						/* Bits 22-23 reserved */
> -	[Y_MAX_LIM]					= GENMASK(29, 24),
> -						/* Bits 30-31 reserved */
> +	[X_MIN_LIM]					= GENMASK(7, 0),
> +	[X_MAX_LIM]					= GENMASK(15, 8),
> +	[Y_MIN_LIM]					= GENMASK(23, 16),
> +	[Y_MAX_LIM]					= GENMASK(31, 24),
>  };
> 
>  IPA_REG_STRIDE_FIELDS(DST_RSRC_GRP_01_RSRC_TYPE, 
> dst_rsrc_grp_01_rsrc_type,
>  		      0x00000500, 0x0020);
> 
>  static const u32 ipa_reg_dst_rsrc_grp_23_rsrc_type_fmask[] = {
> -	[X_MIN_LIM]					= GENMASK(5, 0),
> -						/* Bits 6-7 reserved */
> -	[X_MAX_LIM]					= GENMASK(13, 8),
> -						/* Bits 14-15 reserved */
> -	[Y_MIN_LIM]					= GENMASK(21, 16),
> -						/* Bits 22-23 reserved */
> -	[Y_MAX_LIM]					= GENMASK(29, 24),
> -						/* Bits 30-31 reserved */
> +	[X_MIN_LIM]					= GENMASK(7, 0),
> +	[X_MAX_LIM]					= GENMASK(15, 8),
> +	[Y_MIN_LIM]					= GENMASK(23, 16),
> +	[Y_MAX_LIM]					= GENMASK(31, 24),
>  };
> 
>  IPA_REG_STRIDE_FIELDS(DST_RSRC_GRP_23_RSRC_TYPE, 
> dst_rsrc_grp_23_rsrc_type,
>  		      0x00000504, 0x0020);
> 
>  static const u32 ipa_reg_dst_rsrc_grp_45_rsrc_type_fmask[] = {
> -	[X_MIN_LIM]					= GENMASK(5, 0),
> -						/* Bits 6-7 reserved */
> -	[X_MAX_LIM]					= GENMASK(13, 8),
> -						/* Bits 14-15 reserved */
> -	[Y_MIN_LIM]					= GENMASK(21, 16),
> -						/* Bits 22-23 reserved */
> -	[Y_MAX_LIM]					= GENMASK(29, 24),
> -						/* Bits 30-31 reserved */
> +	[X_MIN_LIM]					= GENMASK(7, 0),
> +	[X_MAX_LIM]					= GENMASK(15, 8),
> +	[Y_MIN_LIM]					= GENMASK(23, 16),
> +	[Y_MAX_LIM]					= GENMASK(31, 24),
>  };
> 
>  IPA_REG_STRIDE_FIELDS(DST_RSRC_GRP_45_RSRC_TYPE, 
> dst_rsrc_grp_45_rsrc_type,
>  		      0x00000508, 0x0020);
> 
>  static const u32 ipa_reg_dst_rsrc_grp_67_rsrc_type_fmask[] = {
> -	[X_MIN_LIM]					= GENMASK(5, 0),
> -						/* Bits 6-7 reserved */
> -	[X_MAX_LIM]					= GENMASK(13, 8),
> -						/* Bits 14-15 reserved */
> -	[Y_MIN_LIM]					= GENMASK(21, 16),
> -						/* Bits 22-23 reserved */
> -	[Y_MAX_LIM]					= GENMASK(29, 24),
> -						/* Bits 30-31 reserved */
> +	[X_MIN_LIM]					= GENMASK(7, 0),
> +	[X_MAX_LIM]					= GENMASK(15, 8),
> +	[Y_MIN_LIM]					= GENMASK(23, 16),
> +	[Y_MAX_LIM]					= GENMASK(31, 24),
>  };
> 
>  IPA_REG_STRIDE_FIELDS(DST_RSRC_GRP_67_RSRC_TYPE, 
> dst_rsrc_grp_67_rsrc_type,