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Tue, 20 Jun 2023 18:02:28 +0000 Date: Tue, 20 Jun 2023 11:02:26 -0700 From: Lucas De Marchi To: Andy Shevchenko CC: Jani Nikula , Andrew Morton , , Kevin Brodsky , , , Christian =?utf-8?B?S8O2bmln?= , Alex Deucher , "Thomas Gleixner" , Masahiro Yamada , Subject: Re: [Intel-xe] [PATCH 2/3] linux/bits.h: Add fixed-width GENMASK and BIT macros Message-ID: References: <20230509051403.2748545-3-lucas.demarchi@intel.com> <87pm75kd0h.fsf@intel.com> <87mt29kc34.fsf@intel.com> <875y7igph5.fsf@intel.com> Content-Type: text/plain; charset="us-ascii"; format=flowed Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: MW4PR03CA0328.namprd03.prod.outlook.com (2603:10b6:303:dd::33) To CY5PR11MB6139.namprd11.prod.outlook.com (2603:10b6:930:29::17) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY5PR11MB6139:EE_|SN7PR11MB7114:EE_ X-MS-Office365-Filtering-Correlation-Id: f57df83b-56ce-4115-e33b-08db71b882ce X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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>> > > > u64 y = GENMASK_ULL(); >> > > > >> > > > No? Then use in your code either x or y. Note that I assume that the parameters >> > > > to GENMASK*() are built-time constants. Is it the case for you? >> > > >> > > What's wrong with wanting to define macros with specific size, depending >> > > on e.g. hardware registers instead of build size? >> > >> > Nothing, but I think the problem is smaller than it's presented. >> >> not sure about big/small problem you are talking about. It's a problem >> for when the *device* register is a 32b fixed width, which is >> independent from the CPU you are running on. We also have registers that >> are u16 and u64. Having fixed-width GENMASK and BIT helps avoiding >> mistakes like below. Just to use one example, the diff below builds >> fine on my 64b machine, yet it's obviously wrong: >> >> $ git diff diff --git a/drivers/gpu/drm/i915/gt/intel_gt_mcr.c >> b/drivers/gpu/drm/i915/gt/intel_gt_mcr.c >> index 0b414eae1683..692a0ad9a768 100644 >> --- a/drivers/gpu/drm/i915/gt/intel_gt_mcr.c >> +++ b/drivers/gpu/drm/i915/gt/intel_gt_mcr.c >> @@ -261,8 +261,8 @@ static u32 rw_with_mcr_steering_fw(struct intel_gt *gt, >> * No need to save old steering reg value. >> */ >> intel_uncore_write_fw(uncore, MTL_MCR_SELECTOR, >> - REG_FIELD_PREP(MTL_MCR_GROUPID, group) | >> - REG_FIELD_PREP(MTL_MCR_INSTANCEID, instance) | >> + FIELD_PREP(MTL_MCR_GROUPID, group) | >> + FIELD_PREP(MTL_MCR_INSTANCEID, instance) | >> (rw_flag == FW_REG_READ ? GEN11_MCR_MULTICAST : 0)); >> } else if (GRAPHICS_VER(uncore->i915) >= 11) { >> mcr_mask = GEN11_MCR_SLICE_MASK | GEN11_MCR_SUBSLICE_MASK; >> diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h b/drivers/gpu/drm/i915/gt/intel_gt_regs.h >> index 718cb2c80f79..c42bc2900c6a 100644 >> --- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h >> +++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h >> @@ -80,8 +80,8 @@ >> #define GEN11_MCR_SLICE_MASK GEN11_MCR_SLICE(0xf) >> #define GEN11_MCR_SUBSLICE(subslice) (((subslice) & 0x7) << 24) >> #define GEN11_MCR_SUBSLICE_MASK GEN11_MCR_SUBSLICE(0x7) >> -#define MTL_MCR_GROUPID REG_GENMASK(11, 8) >> -#define MTL_MCR_INSTANCEID REG_GENMASK(3, 0) >> +#define MTL_MCR_GROUPID GENMASK(32, 8) >> +#define MTL_MCR_INSTANCEID GENMASK(3, 0) >> #define IPEIR_I965 _MMIO(0x2064) >> #define IPEHR_I965 _MMIO(0x2068) >> >> If the driver didn't support 32b CPUs, this would even go unnoticed. > >So, what does prevent you from using GENMASK_ULL()? nothing is preventing me to write the wrong code, which is what we are trying to solve. GENMASK_ULL() would generate the wrong code as that particular register is 32b, not 64b, on the GPU. > >Another point, you may teach GENMASK() to issue a warning if hi and/or lo >bigger than BITS_PER_LONG. Which varies depending on the CPU you are building for, so it misses the point. GENMASK_U32/GENMASK_U16/GENMASK_U8 and BIT counterparts would emit a warning if hi is bigger than _exactly_ 32, 16 or 8, regardless of the CPU you built the code for. Lucas De Marchi > >I still don't see the usefulness of that churn. > >> Lucas De Marchi >> >> > And there are already header for bitfields with a lot of helpers >> > for (similar) cases if not yours. >> > >> > > What would you use for printk format if you wanted to to print >> > > GENMASK()? >> > >> > %lu, no? > >-- >With Best Regards, >Andy Shevchenko > >