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10<div class="header">
11 <h1>The Mesa 3D Graphics Library</h1>
12</div>
13
14<iframe src="contents.html"></iframe>
15<div class="content">
16
17<h1>Submitting patches</h1>
18
19
20<ul>
21<li><a href="#guidelines">Basic guidelines</a>
22<li><a href="#formatting">Patch formatting</a>
23<li><a href="#testing">Testing Patches</a>
24<li><a href="#mailing">Mailing Patches</a>
25<li><a href="#reviewing">Reviewing Patches</a>
26<li><a href="#nominations">Nominating a commit for a stable branch</a>
27<li><a href="#criteria">Criteria for accepting patches to the stable branch</a>
Emil Velikovf9cdfa32017-02-13 19:23:39 +0000[diff] [blame]28<li><a href="#backports">Sending backports for the stable branch</a>
Timothy Arcerie260bfe2016-11-21 16:30:12 +0000[diff] [blame]29<li><a href="#gittips">Git tips</a>
Emil Velikov259e65c2016-11-16 00:20:56 +0000[diff] [blame]30</ul>
31
32<h2 id="guidelines">Basic guidelines</h2>
33
34<ul>
35<li>Patches should not mix code changes with code formatting changes (except,
36perhaps, in very trivial cases.)
37<li>Code patches should follow Mesa
38<a href="codingstyle.html" target="_parent">coding conventions</a>.
39<li>Whenever possible, patches should only effect individual Mesa/Gallium
40components.
41<li>Patches should never introduce build breaks and should be bisectable (see
42<code>git bisect</code>.)
43<li>Patches should be properly <a href="#formatting">formatted</a>.
44<li>Patches should be sufficiently <a href="#testing">tested</a> before submitting.
Andres Gomez28158c32016-11-28 18:47:42 +0200[diff] [blame]45<li>Patches should be submitted to <a href="#mailing">mesa-dev</a>
Emil Velikov259e65c2016-11-16 00:20:56 +0000[diff] [blame]46for <a href="#reviewing">review</a> using <code>git send-email</code>.
47
48</ul>
49
50<h2 id="formatting">Patch formatting</h2>
51
52<ul>
53<li>Lines should be limited to 75 characters or less so that git logs
54displayed in 80-column terminals avoid line wrapping. Note that git
55log uses 4 spaces of indentation (4 + 75 &lt; 80).
56<li>The first line should be a short, concise summary of the change prefixed
57with a module name. Examples:
58<pre>
59 mesa: Add support for querying GL_VERTEX_ATTRIB_ARRAY_LONG
60
61 gallium: add PIPE_CAP_DEVICE_RESET_STATUS_QUERY
62
63 i965: Fix missing type in local variable declaration.
64</pre>
65<li>Subsequent patch comments should describe the change in more detail,
66if needed. For example:
67<pre>
68 i965: Remove end-of-thread SEND alignment code.
69
70 This was present in Eric's initial implementation of the compaction code
71 for Sandybridge (commit 077d01b6). There is no documentation saying this
72 is necessary, and removing it causes no regressions in piglit on any
73 platform.
74</pre>
75<li>A "Signed-off-by:" line is not required, but not discouraged either.
Emil Velikov99266ec2017-02-11 12:08:34 +0000[diff] [blame]76<li>If a patch addresses a bugzilla issue, that should be noted in the
Emil Velikov259e65c2016-11-16 00:20:56 +0000[diff] [blame]77patch comment. For example:
78<pre>
79 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=89689
80</pre>
Emil Velikova40ebe72017-02-13 19:23:41 +0000[diff] [blame]81<li>If a patch addresses a issue introduced with earlier commit, that should be
82noted in the patch comment. For example:
83<pre>
84 Fixes: d7b3707c612 "util/disk_cache: use stat() to check if entry is a directory"
85</pre>
Emil Velikov259e65c2016-11-16 00:20:56 +0000[diff] [blame]86<li>If there have been several revisions to a patch during the review
87process, they should be noted such as in this example:
88<pre>
89 st/mesa: add ARB_texture_stencil8 support (v4)
90
91 if we support stencil texturing, enable texture_stencil8
92 there is no requirement to support native S8 for this,
93 the texture can be converted to x24s8 fine.
94
95 v2: fold fixes from Marek in:
96 a) put S8 last in the list
97 b) fix renderable to always test for d/s renderable
98 fixup the texture case to use a stencil only format
99 for picking the format for the texture view.
100 v3: hit fallback for getteximage
101 v4: put s8 back in front, it shouldn't get picked now (Ilia)
102</pre>
103<li>If someone tested your patch, document it with a line like this:
104<pre>
105 Tested-by: Joe Hacker &lt;jhacker@foo.com&gt;
106</pre>
107<li>If the patch was reviewed (usually the case) or acked by someone,
108that should be documented with:
109<pre>
110 Reviewed-by: Joe Hacker &lt;jhacker@foo.com&gt;
111 Acked-by: Joe Hacker &lt;jhacker@foo.com&gt;
112</pre>
George Kyriazisba28f212016-11-28 17:35:26 +0000[diff] [blame]113<li>If sending later revision of a patch, add all the tags - ack, r-b,
Eric Engestromfae5e1d2016-11-29 11:40:55 +0000[diff] [blame]114Cc: mesa-stable and/or other. This provides reviewers with quick feedback if the
George Kyriazisba28f212016-11-28 17:35:26 +0000[diff] [blame]115patch has already been reviewed.
Emil Velikova2283b52016-11-21 17:53:33 +0000[diff] [blame]116<li>In order for your patch to reach the prospective reviewer easier/faster,
117use the script scripts/get_reviewer.pl to get a list of individuals and include
118them in the CC list.
119<br>
120Please use common sense and do <strong>not</strong> blindly add everyone.
121<br>
122<pre>
Eric Engestrom077879c2017-02-26 23:58:03 +0000[diff] [blame]123 $ scripts/get_reviewer.pl --help # to get the help screen
Emil Velikova2283b52016-11-21 17:53:33 +0000[diff] [blame]124 $ scripts/get_reviewer.pl -f src/egl/drivers/dri2/platform_android.c
125 Rob Herring <robh@kernel.org> (reviewer:ANDROID EGL SUPPORT,added_lines:188/700=27%,removed_lines:58/283=20%)
126 Tomasz Figa <tfiga@chromium.org> (reviewer:ANDROID EGL SUPPORT,authored:12/41=29%,added_lines:308/700=44%,removed_lines:115/283=41%)
127 Emil Velikov <emil.l.velikov@gmail.com> (authored:13/41=32%,removed_lines:76/283=27%)
128</pre>
Emil Velikov259e65c2016-11-16 00:20:56 +0000[diff] [blame]129</ul>
130
131
132
133<h2 id="testing">Testing Patches</h2>
134
135<p>
136It should go without saying that patches must be tested. In general,
137do whatever testing is prudent.
138</p>
139
140<p>
141You should always run the Mesa test suite before submitting patches.
142The test suite can be run using the 'make check' command. All tests
143must pass before patches will be accepted, this may mean you have
144to update the tests themselves.
145</p>
146
147<p>
148Whenever possible and applicable, test the patch with
Eric Engestrom30cf9ff2017-02-09 02:10:17 +0000[diff] [blame]149<a href="https://piglit.freedesktop.org">Piglit</a> and/or
Emil Velikov259e65c2016-11-16 00:20:56 +0000[diff] [blame]150<a href="https://android.googlesource.com/platform/external/deqp/">dEQP</a>
151to check for regressions.
152</p>
153
Eric Engestrom81557af2017-09-15 17:10:57 +0000[diff] [blame]154<p>
155As mentioned at the begining, patches should be bisectable.
156A good way to test this is to make use of the `git rebase` command,
157to run your tests on each commit. Assuming your branch is based off
158<code>origin/master</code>, you can run:
159<pre>
160$ git rebase --interactive --exec "make check" origin/master
161</pre>
162replacing <code>"make check"</code> with whatever other test you want to
163run.
164</p>
165
Emil Velikov259e65c2016-11-16 00:20:56 +0000[diff] [blame]166
167<h2 id="mailing">Mailing Patches</h2>
168
169<p>
170Patches should be sent to the mesa-dev mailing list for review:
171<a href="https://lists.freedesktop.org/mailman/listinfo/mesa-dev">
Emil Velikovb571c072016-11-16 11:54:54 +0000[diff] [blame]172mesa-dev@lists.freedesktop.org</a>.
Emil Velikov259e65c2016-11-16 00:20:56 +0000[diff] [blame]173When submitting a patch make sure to use
174<a href="https://git-scm.com/docs/git-send-email">git send-email</a>
175rather than attaching patches to emails. Sending patches as
176attachments prevents people from being able to provide in-line review
177comments.
178</p>
179
180<p>
181When submitting follow-up patches you can use --in-reply-to to make v2, v3,
182etc patches show up as replies to the originals. This usually works well
183when you're sending out updates to individual patches (as opposed to
184re-sending the whole series). Using --in-reply-to makes
185it harder for reviewers to accidentally review old patches.
186</p>
187
188<p>
189When submitting follow-up patches you should also login to
190<a href="https://patchwork.freedesktop.org">patchwork</a> and change the
191state of your old patches to Superseded.
192</p>
193
Eric Engestrom0adc9832017-03-22 15:55:28 +0000[diff] [blame]194<p>
195Some companies' mail server automatically append a legal disclaimer,
196usually containing something along the lines of "The information in this
197email is confidential" and "distribution is strictly prohibited".<br/>
198These legal notices prevent us from being able to accept your patch,
199rendering the whole process pointless. Please make sure these are
200disabled before sending your patches. (Note that you may need to contact
201your email administrator for this.)
202</p>
203
Emil Velikov259e65c2016-11-16 00:20:56 +0000[diff] [blame]204<h2 id="reviewing">Reviewing Patches</h2>
205
206<p>
207When you've reviewed a patch on the mailing list, please be unambiguous
208about your review. That is, state either
Emil Velikovb571c072016-11-16 11:54:54 +0000[diff] [blame]209</p>
Emil Velikov259e65c2016-11-16 00:20:56 +0000[diff] [blame]210<pre>
211 Reviewed-by: Joe Hacker &lt;jhacker@foo.com&gt;
212</pre>
213or
214<pre>
215 Acked-by: Joe Hacker &lt;jhacker@foo.com&gt;
216</pre>
Emil Velikovb571c072016-11-16 11:54:54 +0000[diff] [blame]217<p>
Emil Velikov259e65c2016-11-16 00:20:56 +0000[diff] [blame]218Rather than saying just "LGTM" or "Seems OK".
219</p>
220
221<p>
222If small changes are suggested, it's OK to say something like:
Emil Velikovb571c072016-11-16 11:54:54 +0000[diff] [blame]223</p>
Emil Velikov259e65c2016-11-16 00:20:56 +0000[diff] [blame]224<pre>
225 With the above fixes, Reviewed-by: Joe Hacker &lt;jhacker@foo.com&gt;
226</pre>
Emil Velikovb571c072016-11-16 11:54:54 +0000[diff] [blame]227<p>
Emil Velikov259e65c2016-11-16 00:20:56 +0000[diff] [blame]228which tells the patch author that the patch can be committed, as long
229as the issues are resolved first.
230</p>
231
232
233<h2 id="nominations">Nominating a commit for a stable branch</h2>
234
235<p>
Emil Velikov99266ec2017-02-11 12:08:34 +0000[diff] [blame]236There are three ways to nominate a patch for inclusion in the stable branch and
Emil Velikov07384462016-11-16 11:51:50 +0000[diff] [blame]237release.
238</p>
239<ul>
240<li> By adding the Cc: mesa-stable@ tag as described below.
241<li> Sending the commit ID (as seen in master branch) to the mesa-stable@ mailing list.
242<li> Forwarding the patch from the mesa-dev@ mailing list.
243</li>
244</ul>
245<p>
246Note: resending patch identical to one on mesa-dev@ or one that differs only
247by the extra mesa-stable@ tag is <strong>not</strong> recommended.
248</p>
Eric Engestrom10f5e0d2018-01-12 15:10:28 +0000[diff] [blame]249<p>
250If you are not the author of the original patch, please Cc: them in your
251nomination request.
252</p>
Emil Velikov07384462016-11-16 11:51:50 +0000[diff] [blame]253
254
255<h3 id="thetag">The stable tag</h3>
256
257<p>
Emil Velikov259e65c2016-11-16 00:20:56 +0000[diff] [blame]258If you want a commit to be applied to a stable branch,
259you should add an appropriate note to the commit message.
260</p>
261
262<p>
263Here are some examples of such a note:
264</p>
265<ul>
266 <li>CC: &lt;mesa-stable@lists.freedesktop.org&gt;</li>
Emil Velikov259e65c2016-11-16 00:20:56 +0000[diff] [blame]267</ul>
268
269Simply adding the CC to the mesa-stable list address is adequate to nominate
Emil Velikov9e4248b2017-02-13 19:23:40 +0000[diff] [blame]270the commit for all the active stable branches. If the commit is not applicable
271for said branch the stable-release manager will reply stating so.
Emil Velikov259e65c2016-11-16 00:20:56 +0000[diff] [blame]272
273This "CC" syntax for patch nomination will cause patches to automatically be
274copied to the mesa-stable@ mailing list when you use "git send-email" to send
Emil Velikov07384462016-11-16 11:51:50 +0000[diff] [blame]275patches to the mesa-dev@ mailing list. If you prefer using --suppress-cc that
Emil Velikov99266ec2017-02-11 12:08:34 +0000[diff] [blame]276won't have any negative effect on the patch nomination.
Emil Velikov259e65c2016-11-16 00:20:56 +0000[diff] [blame]277
Emil Velikov0715ba42016-12-05 16:11:21 +0000[diff] [blame]278<p>
279Note: by removing the tag [as the commit is pushed] the patch is
280<strong>explicitly</strong> rejected from inclusion in the stable branch(es).
281<br>
282Thus, drop the line <strong>only</strong> if you want to cancel the nomination.
283</p>
284
Bas Nieuwenhuizen566f2ed2017-04-14 23:39:15 +0200[diff] [blame]285Alternatively, if one uses the "Fixes" tag as described in the "Patch formatting"
286section, it nominates a commit for all active stable branches that include the
287commit that is referred to.
288
Emil Velikov259e65c2016-11-16 00:20:56 +0000[diff] [blame]289<h2 id="criteria">Criteria for accepting patches to the stable branch</h2>
290
291Mesa has a designated release manager for each stable branch, and the release
Emil Velikovd7e0ff02017-02-13 19:23:38 +0000[diff] [blame]292manager is the only developer that should be pushing changes to these branches.
293Everyone else should nominate patches using the mechanism described above.
Emil Velikov259e65c2016-11-16 00:20:56 +0000[diff] [blame]294
Emil Velikovd7e0ff02017-02-13 19:23:38 +0000[diff] [blame]295The following rules define which patches are accepted and which are not. The
296stable-release manager is also given broad discretion in rejecting patches
297that have been nominated.
298
299<ul>
300 <li>Patch must conform with the <a href="#guidelines">Basic guidelines</a></li>
301
302 <li>Patch must have landed in master first. In case where the original
303 patch is too large and/or otherwise contradicts with the rules set within, a
304 backport is appropriate.</li>
305
306 <li>It must not introduce a regression - be that build or runtime wise.
307
308 Note: If the regression is due to faulty piglit/dEQP/CTS/other test the
309 latter must be fixed first. A reference to the offending test(s) and
310 respective fix(es) should be provided in the nominated patch.</li>
311
312 <li>Patch cannot be larger than 100 lines.</li>
313
314 <li>Patches that move code around with no functional change should be
315 rejected.</li>
316
317 <li>Patch must be a bug fix and not a new feature.
318
319 Note: An exception to this rule, are hardware-enabling "features". For
Emil Velikovf9cdfa32017-02-13 19:23:39 +0000[diff] [blame]320 example, <a href="#backports">backports</a> of new code to support a
321 newly-developed hardware product can be accepted if they can be reasonably
322 determined not to have effects on other hardware.</li>
Emil Velikovd7e0ff02017-02-13 19:23:38 +0000[diff] [blame]323
324 <li>Patch must be reviewed, For example, the commit message has Reviewed-by,
325 Signed-off-by, or Tested-by tags from someone but the author.</li>
326
327 <li>Performance patches are considered only if they provide information
328 about the hardware, program in question and observed improvement. Use numbers
329 to represent your measurements.</li>
330</ul>
331
332If the patch complies with the rules it will be
333<a href="releasing.html#pickntest">cherry-picked</a>. Alternatively the release
334manager will reply to the patch in question stating why the patch has been
335rejected or would request a backport.
336
337A summary of all the picked/rejected patches will be presented in the
338<a href="releasing.html#prerelease">pre-release</a> announcement.
Emil Velikov259e65c2016-11-16 00:20:56 +0000[diff] [blame]339
340The stable-release manager may at times need to force-push changes to the
341stable branches, for example, to drop a previously-picked patch that was later
342identified as causing a regression). These force-pushes may cause changes to
343be lost from the stable branch if developers push things directly. Consider
344yourself warned.
345
Emil Velikovf9cdfa32017-02-13 19:23:39 +0000[diff] [blame]346<h2 id="backports">Sending backports for the stable branch</h2>
347By default merge conflicts are resolved by the stable-release manager. In which
348case he/she should provide a comment about the changes required, alongside the
349<code>Conflicts</code> section. Summary of which will be provided in the
350<a href="releasing.html#prerelease">pre-release</a> announcement.
351<br>
352Developers are interested in sending backports are recommended to use either a
353<code>[BACKPORT #branch]</code> subject prefix or provides similar information
354within the commit summary.
355
Timothy Arcerie260bfe2016-11-21 16:30:12 +0000[diff] [blame]356<h2 id="gittips">Git tips</h2>
357
358<ul>
Emil Velikov6dae5be2016-11-28 17:40:04 +0000[diff] [blame]359<li><code>git rebase -i ...</code> is your friend. Don't be afraid to use it.
360<li>Apply a fixup to commit FOO.
361<pre>
362 git add ...
363 git commit --fixup=FOO
364 git rebase -i --autosquash ...
365</pre>
Timothy Arcerie260bfe2016-11-21 16:30:12 +0000[diff] [blame]366<li>Test for build breakage between patches e.g last 8 commits.
367<pre>
368 git rebase -i --exec="make -j4" HEAD~8
369</pre>
370<li>Sets the default mailing address for your repo.
371<pre>
372 git config --local sendemail.to mesa-dev@lists.freedesktop.org
373</pre>
374<li> Add version to subject line of patch series in this case for the last 8
375commits before sending.
376<pre>
377 git send-email --subject-prefix="PATCH v4" HEAD~8
378 git send-email -v4 @~8 # shorter version, inherited from git format-patch
379</pre>
Emil Velikova2283b52016-11-21 17:53:33 +0000[diff] [blame]380<li> Configure git to use the get_reviewer.pl script interactively. Thus you
381can avoid adding the world to the CC list.
382<pre>
383 git config sendemail.cccmd "./scripts/get_reviewer.pl -i"
384</pre>
Timothy Arcerie260bfe2016-11-21 16:30:12 +0000[diff] [blame]385</ul>
386
Emil Velikov259e65c2016-11-16 00:20:56 +0000[diff] [blame]387
388</div>
389</body>
390</html>