From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Summers, Stuart" Subject: Re: [CI 5/5] drm/i915: Expand subslice mask Date: Wed, 29 May 2019 15:58:52 +0000 Message-ID: References: <20190524154022.13575-1-stuart.summers@intel.com> <20190524154022.13575-6-stuart.summers@intel.com> <87r28h489e.fsf@intel.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1070661411==" Return-path: Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by gabe.freedesktop.org (Postfix) with ESMTPS id 9F88A6E0AE for ; Wed, 29 May 2019 15:58:55 +0000 (UTC) In-Reply-To: <87r28h489e.fsf@intel.com> Content-Language: en-US List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" To: "intel-gfx@lists.freedesktop.org" , "jani.nikula@linux.intel.com" List-Id: intel-gfx@lists.freedesktop.org --===============1070661411== Content-Language: en-US Content-Type: multipart/signed; micalg=sha-1; protocol="application/x-pkcs7-signature"; boundary="=-S7Bwzuuddl50g1HOySRK" --=-S7Bwzuuddl50g1HOySRK Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2019-05-29 at 17:58 +0300, Jani Nikula wrote: > On Fri, 24 May 2019, Stuart Summers wrote: > > Currently, the subslice_mask runtime parameter is stored as an > > array of subslices per slice. Expand the subslice mask array to > > better match what is presented to userspace through the > > I915_QUERY_TOPOLOGY_INFO ioctl. The index into this array is > > then calculated: > > slice * subslice stride + subslice index / 8 > >=20 > > v2: fix spacing in set_sseu_info args > > use set_sseu_info to initialize sseu data when building > > device status in debugfs > > rename variables in intel_engine_types.h to avoid checkpatch > > warnings > > v3: update headers in intel_sseu.h > > v4: add const to some sseu_dev_info variables > > use sseu->eu_stride for EU stride calculations > > v5: address review comments from Tvrtko and Daniele > > v6: remove extra space in intel_sseu_get_subslices > > return the correct subslice enable in for_each_instdone > > add GEM_BUG_ON to ensure user doesn't pass invalid ss_mask size > > use printk formatted string for subslice mask > > v7: remove string.h header and rebase > >=20 > > Cc: Daniele Ceraolo Spurio > > Cc: Lionel Landwerlin > > Acked-by: Lionel Landwerlin > > Reviewed-by: Daniele Ceraolo Spurio < > > daniele.ceraolospurio@intel.com> > > Signed-off-by: Stuart Summers >=20 > As this patch uncovered a latent issue in 1e40d4aea57b > ("drm/i915/cnl: > Implement WaProgramMgsrForCorrectSliceSpecificMmioReads") and got > reverted, I'll take the opportunity to comment. I acknowledge the > revert > is shooting the messenger a bit, and this will smell like maintainer > bikeshedding. I have no problem reworking regressions my series caused :) I just wasn't aware there was an issue when merging. >=20 > Now, the first reaction looking at the commit was, it does not fare > well > on the "if a bisect landed on this commit, how happy would I be" > scale. >=20 > While it's mostly refactoring, it could be chopped up to several > logical > and obvious steps. For example, add intel_sseu_set_info() first with > no > other changes. Add ss_stride and eu_stride to struct sseu_dev_info > separately. Add intel_sseu_get_subslices() but don't expand yet, make > it > just sseu->subslice_mask[s] first. And so on, you get the idea, a > series > of small non-functional changes followed by patches with functional > changes that stand out. Indeed patches 1-4 did this fine. This is good general feedback, thanks. I'll split this up when reposting. >=20 > It's easy on the reviewer, it's easy on whoever git blames years down > the line. Trust me, we will. >=20 > And it would be the commit adding intel_sseu_get_subslices(), or the > one > adding the GEM_BUG_ON()s into it, that would blow up 1e40d4aea57b > ("drm/i915/cnl: Implement > WaProgramMgsrForCorrectSliceSpecificMmioReads"). >=20 > One more note below. >=20 > > @@ -461,7 +461,9 @@ static int i915_getparam_ioctl(struct > > drm_device *dev, void *data, > > return -ENODEV; > > break; > > case I915_PARAM_SUBSLICE_MASK: > > - value =3D sseu->subslice_mask[0]; > > + /* Only copy bits from the first slice */ > > + memcpy(&value, sseu->subslice_mask, > > + min(sseu->ss_stride, (u8)sizeof(value))); >=20 > Frankly I'd rather see this written in self-evident code without the > comment. Sure, I'll take a look. Thanks for the comments! 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