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Tue, 10 Dec 2024 00:16:47 -0800 (PST) Received: from localhost ([31.210.180.118]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-435a3d54930sm5443635e9.0.2024.12.10.00.16.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Dec 2024 00:16:46 -0800 (PST) Date: Tue, 10 Dec 2024 10:16:44 +0200 From: Efraim Flashner <efraim@HIDDEN> To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@HIDDEN> Subject: Re: bug#74731: guix/cpu should parse /sys/devices/system/cpu/modalias Message-ID: <Z1f47NtnZ1zFZZ0m@3900XT> Mail-Followup-To: Efraim Flashner <efraim@HIDDEN>, Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@HIDDEN>, 74731 <at> debbugs.gnu.org References: <Z1VKB38Jsaw-RKtG@3900XT> <87jzc8lpv1.fsf@HIDDEN> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="w/OVG1VbdlyG0qaf" Content-Disposition: inline In-Reply-To: <87jzc8lpv1.fsf@HIDDEN> X-PGP-Key-ID: 0x41AAE7DCCA3D8351 X-PGP-Key: https://flashner.co.il/~efraim/efraim_flashner.asc X-PGP-Fingerprint: A28B F40C 3E55 1372 662D 14F7 41AA E7DC CA3D 8351 X-Spam-Score: 0.3 (/) X-Debbugs-Envelope-To: 74731 Cc: 74731 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -0.7 (/) --w/OVG1VbdlyG0qaf Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Dec 09, 2024 at 06:37:22PM +0100, Ludovic Court=C3=A8s wrote: > Hello, >=20 > Efraim Flashner <efraim@HIDDEN> skribis: >=20 > > I saw a post by Marcan=C2=B9 of Asahi Linux the other day about not par= sing > > /proc/cpuinfo and remembered that's what we're doing in (guix cpu). >=20 > I believe it initially mimicked what GCC does for =E2=80=98-march=3Dnativ= e=E2=80=99, but > it does seem to be less exhaustive than /sys/devices/cpu/modalias. >=20 > I wonder if there are version/portability issues with the latter. I've been thinking more about it over the past few days. I think ultimately we need to match both parts; the kernel interfaces with the hardware and knows (or at least should know) exactly what the hardware can support, and gcc (or the other compilers) need to support optimizing for those hardware bits specifically. Also, parsing /proc/cpuinfo is already reading what the kernel says it supports, except in an incomplete manner. Starting with x86_64 (and i686), I think we keep GCC's definition of what each sub-architecture is but parse the modalias file instead of parsing cpuinfo. I already have some code to parse modalias and some ideas for just reusing the math bits from the kernel (it looks like ((11*32)+28) for zen2) to adjust the if-flags to match the numerical equivalent of the feature. For x86_64 the kernel does have a policy of reusing flags if they've been deprecated and unused long enough, but hopefully that won't be a problem, even with some of our older LTS kernels. I think for the start it would make most sense to read modalias in addition to cpuinfo, sort based on the data in modialis, and then fallback to cpuinfo if it doesn't match. This helps for architectures without the modalias file (like riscv64), and I don't know what the Hurd provides, but I'd be surprised if it had the same modalias file for parsing. I'll try to work on it a bit over the coming days. --=20 Efraim Flashner <efraim@HIDDEN> =D7=90=D7=A4=D7=A8=D7=99=D7=9D = =D7=A4=D7=9C=D7=A9=D7=A0=D7=A8 GPG key =3D A28B F40C 3E55 1372 662D 14F7 41AA E7DC CA3D 8351 Confidentiality cannot be guaranteed on emails sent or received unencrypted --w/OVG1VbdlyG0qaf Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEEoov0DD5VE3JmLRT3Qarn3Mo9g1EFAmdX+OgACgkQQarn3Mo9 g1G2jRAAnYuWeGCFeYgO+WL1sNmFesRh+LiBqSHxeV4bftENKPBtD0VqR4VX3FtE hoUdgHl44b0hs8wpK6EW+ISQCMOSNyCooyviEUVA0KM7VAJ3ysuOb4YbbfZ+EYx0 TaCg0xFd+op2tpKzi7M/zmV4LHgmNi4G6ak+W1eLKe/mmj4Sv/BhbsRJy+z6h3Ai eA79OJYGWoYBZ0YvH0oZkTlUl/Hfp2ovEArLBYvCF6jhujcjgBi9opxG62iscMDV r5NCGMsW8cDTNhFSeNMgT6hG09CK84/4w1NI+b13lWTcKwwAP1RNntCH8Xp5pR8o ZVX4jkjdDh4xAmQBj07Cv2BYP+PHaazWUe6QVKMqO5SAnADA5v1KDFaKmkzuy0pu 3AvT77jwgC6LgVaLjgVrlnuyzSyYYB0hVsoW0NFzntU8l/jza+DXBGM+r6aKVUeU U4xnRYJ3NMhGVcIf2TbtjPfWa11IukptJxRkgrqMqpTLK3vuE4w5PRvVDkIX98I4 PdM/hZW0GQsxscIQCZMiFY1UJurG5WySHZS/GtI5Ec3tofyKJZhtA7eseogM/cwh pcowalrsjlLWenS69/UuYobfGCwgt6jPNhpRmXIM6LZ1Z728L9Ok3RJc7CCuNuM9 oFRTYcLt7Oh66Y7sm2u35llz37uSclnURBWb8HDVjo69vtHSmdA= =34Y0 -----END PGP SIGNATURE----- --w/OVG1VbdlyG0qaf--
bug-guix@HIDDEN:bug#74731; Package guix.
Full text available.Received: (at submit) by debbugs.gnu.org; 9 Dec 2024 17:37:29 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Mon Dec 09 12:37:29 2024 Received: from localhost ([127.0.0.1]:55465 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1tKhhI-0001fO-Lh for submit <at> debbugs.gnu.org; Mon, 09 Dec 2024 12:37:29 -0500 Received: from lists.gnu.org ([209.51.188.17]:50716) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <ludo@HIDDEN>) id 1tKhhF-0001fC-Sv for submit <at> debbugs.gnu.org; Mon, 09 Dec 2024 12:37:27 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <ludo@HIDDEN>) id 1tKhhF-0007Bk-54 for bug-guix@HIDDEN; Mon, 09 Dec 2024 12:37:25 -0500 Received: from fencepost.gnu.org ([2001:470:142:3::e]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <ludo@HIDDEN>) id 1tKhhE-0007hr-Lg; Mon, 09 Dec 2024 12:37:24 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=MIME-Version:Date:References:In-Reply-To:Subject:To: From; bh=fr0Vi6FaKLl2XCzXGyTtPjRwjKQBYLdBWzPyoG7vpSs=; b=jj1G2UuCsam323FTHZoA pXBA7cIJrc2AMv/YtA22jDR2oWmaw2d5Fqg/wkr0UALWO+dhqwxLXq/fnsNYyzpnt1wlEM78P8efi M/NVADHMsd/TbXFnrjytKDQEI5HVF1qk4xLfNAfsRgiLKgN4hv2nZagnhIh3ZEGWE0YXyAhadIDLY 01VhXkYQ+Am4AaVO5MHjn0qGaMs22xsbxzIQlKbl+YKdL46+K4tOGhy3XDjf5tj5HZL0k4JOZL3oE KER3BemfTI6kFzj5jR3Jcuj2QfHZU92i6uVp4KSSV/4I/cO2RYB+3GK7g0WCvuO9eDI3F4+IJVuxM cT3XrPUAlU6g4Q==; From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN> To: Efraim Flashner <efraim@HIDDEN> Subject: Re: bug#74731: guix/cpu should parse /sys/devices/system/cpu/modalias In-Reply-To: <Z1VKB38Jsaw-RKtG@3900XT> (Efraim Flashner's message of "Sun, 8 Dec 2024 09:25:59 +0200") References: <Z1VKB38Jsaw-RKtG@3900XT> Date: Mon, 09 Dec 2024 18:37:22 +0100 Message-ID: <87jzc8lpv1.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: submit Cc: bug-guix@HIDDEN X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -3.3 (---) Hello, Efraim Flashner <efraim@HIDDEN> skribis: > I saw a post by Marcan=C2=B9 of Asahi Linux the other day about not parsi= ng > /proc/cpuinfo and remembered that's what we're doing in (guix cpu). I believe it initially mimicked what GCC does for =E2=80=98-march=3Dnative= =E2=80=99, but it does seem to be less exhaustive than /sys/devices/cpu/modalias. I wonder if there are version/portability issues with the latter. Ludo=E2=80=99.
bug-guix@HIDDEN:bug#74731; Package guix.
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Sat, 07 Dec 2024 23:26:03 -0800 (PST) Received: from localhost ([31.210.180.118]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3861ecf4087sm9500029f8f.5.2024.12.07.23.26.01 for <bug-guix@HIDDEN> (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 07 Dec 2024 23:26:02 -0800 (PST) Date: Sun, 8 Dec 2024 09:25:59 +0200 From: Efraim Flashner <efraim@HIDDEN> To: bug-guix@HIDDEN Subject: guix/cpu should parse /sys/devices/system/cpu/modalias Message-ID: <Z1VKB38Jsaw-RKtG@3900XT> Mail-Followup-To: Efraim Flashner <efraim@HIDDEN>, bug-guix@HIDDEN MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="cQe8am69YhIDeLD5" Content-Disposition: inline X-PGP-Key-ID: 0x41AAE7DCCA3D8351 X-PGP-Key: https://flashner.co.il/~efraim/efraim_flashner.asc X-PGP-Fingerprint: A28B F40C 3E55 1372 662D 14F7 41AA E7DC CA3D 8351 Received-SPF: pass client-ip=2a00:1450:4864:20::331; envelope-from=efraim.flashner@HIDDEN; helo=mail-wm1-x331.google.com X-Spam_score_int: -19 X-Spam_score: -2.0 X-Spam_bar: -- X-Spam_report: (-2.0 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.001, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-Spam-Score: -1.1 (-) X-Debbugs-Envelope-To: submit X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -2.1 (--) --cQe8am69YhIDeLD5 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable I saw a post by Marcan=C2=B9 of Asahi Linux the other day about not parsing /proc/cpuinfo and remembered that's what we're doing in (guix cpu). I've included a couple of dumps below and some notes regarding future implementation: // My machine (ins)efraim@3900XT ~$ cat /sys/devices/system/cpu/modalias cpu:type:x86,ven0002fam0017mod0071:feature:,0000,0001,0002,0003,0004,0005,0= 006,0007,0008,0009,000B,000C,000D,000E,000F,0010,0011,0013,0017,0018,0019,0= 01A,001C,0020,0021,0022,0023,0024,0025,0026,0027,0028,0029,002B,002C,002D,0= 02E,002F,0030,0031,0034,0036,0037,0038,0039,003A,003B,003D,0064,0068,006E,0= 070,0074,0075,0076,0078,0079,007A,007C,007D,0080,0081,0083,0089,008C,008D,0= 093,0094,0095,0096,0097,0099,009A,009B,009C,009D,009E,00C0,00C1,00C3,00C4,0= 0C5,00C6,00C7,00C8,00C9,00CA,00CC,00CD,00D1,00D6,00D7,00D8,00DA,00DC,00DD,0= 0DE,00E2,00E4,00E6,00E8,00EA,00ED,00F0,00F1,00F2,00F3,00F5,00FA,00FB,00FC,0= 10F,0120,0123,0125,0127,0128,012C,012F,0132,0133,0134,0137,0138,013D,0140,0= 141,0142,0160,0161,0162,0163,0165,016C,016E,016F,0170,0178,017C,01A0,01A1,0= 1A2,01A4,01A6,01A9,01AA,01AC,01AD,01AF,01B2,01B3,01B8,01C2,01E0,01E1,01E2,0= 1E3,01E4,01E5,01E6,01E7,01EA,01EB,01EC,01ED,01EF,01F0,01F1,01F4,0202,0216,0= 220,0221,0223,0224,0261,0262,0263,0270,0282,029C // Berlin, aka ci.guix.gnu.org (ins)efraim@berlin ~$ cat /sys/devices/system/cpu/modalias cpu:type:x86,ven0002fam0017mod0001:feature:,0000,0001,0002,0003,0004,0005,0= 006,0007,0008,0009,000B,000C,000D,000E,000F,0010,0011,0013,0017,0018,0019,0= 01A,001C,0020,0021,0022,0023,0024,0025,0026,0027,0028,0029,002B,002C,002D,0= 02E,002F,0030,0031,0034,0036,0037,0038,0039,003A,003B,003D,0064,0068,006E,0= 070,0074,0075,0078,0079,007A,007B,007C,007D,0080,0081,0083,0089,008C,008D,0= 093,0094,0096,0097,0099,009A,009B,009C,009D,009E,00C0,00C1,00C2,00C3,00C4,0= 0C5,00C6,00C7,00C8,00C9,00CC,00CD,00D1,00D6,00D7,00D8,00DA,00DC,00DD,00E2,0= 0E8,00EA,00ED,00F1,00F3,00F5,00F8,00FA,00FC,010F,0120,0123,0125,0127,0128,0= 132,0133,0134,0137,013D,0140,0141,0142,0143,0165,016C,016E,016F,0170,0178,0= 17F,01A0,01A1,01A2,01AC,01C2,01E0,01E1,01E2,01E3,01E4,01E5,01E6,01E7,01EA,0= 1EB,01EC,01ED,01EF,01F0,0220,0221,0223,0224,0261,0262,0263,0282,029C // pine64, kickstarter addition (ins)efraim@3900XT ~$ ssh pine64 cat /sys/devices/system/cpu/modalias cpu:type:aarch64:feature:,0000,0001,0002,0003,0004,0005,0006,0007,000B // rock64 (ins)efraim@3900XT ~$ ssh rock64 cat /sys/devices/system/cpu/modalias cpu:type:aarch64:feature:,0000,0001,0002,0003,0004,0005,0006,0007,000B // raspberry pi 5b (ins)efraim@3900XT ~$ ssh ubuntu.unicorn-typhon.ts.net cat /sys/devices/sys= tem/cpu/modalias efraim@HIDDEN: Permission denied (publickey). (ins)efraim@3900XT ~$ ssh ubuntu@HIDDEN cat /sys/devi= ces/system/cpu/modalias cpu:type:aarch64:feature:,0000,0001,0002,0003,0004,0005,0006,0007,0008,0009= ,000A,000B,000C,000F,0010,0014 // power9 machine from OSU for ci.guix.gnu.org (ins)efraim@3900XT ~$ ssh guixp9 cat /sys/devices/system/cpu/modalias cpu:type:power9:feature:,0001,0006,0007,0008,000A,000D,000E,001A,001B,001C,= 001E,001F,0034,0035,0036,0037,0039,003A,003B,003C,003D,003F // rpi 1b (ins)efraim@3900XT ~$ ssh 192.168.68.50 cat /sys/devices/system/cpu/modalias cpu:type:v6l:feature:,0001,0002,0004,0006,0007,0008,000F // hifive unmatched, riscv64 (ins)efraim@3900XT ~$ ssh 192.168.68.51 cat /sys/devices/system/cpu/modalias cat: /sys/devices/system/cpu/modalias: No such file or directory // macbook 4,1 I think (ins)efraim@3900XT ~$ ssh israel.unicorn-typhon.ts.net cat /sys/devices/sys= tem/cpu/modalias cpu:type:x86,ven0000fam0006mod0017:feature:,0000,0001,0002,0003,0004,0005,0= 006,0007,0008,0009,000B,000C,000D,000E,000F,0010,0011,0013,0015,0016,0017,0= 018,0019,001A,001C,001D,001F,002B,0034,003D,0068,006B,006C,006D,006F,0070,0= 072,0074,0075,0079,007C,0080,0082,0083,0084,0085,0087,0088,0089,008D,008E,0= 08F,0093,00C0,00EB,00ED,00F3,00FD,00FF,0100,0101,0102,0104,0165,016C,0172,0= 1C0 arch/x86/include/asm/cpufeatures.h list of CPU features for x86 and x86_64 I haven't been able to find the table for other architectures yet. =C2=B9 https://social.treehouse.systems/@marcan/113548772069263164 --=20 Efraim Flashner <efraim@HIDDEN> =D7=90=D7=A4=D7=A8=D7=99=D7=9D = =D7=A4=D7=9C=D7=A9=D7=A0=D7=A8 GPG key =3D A28B F40C 3E55 1372 662D 14F7 41AA E7DC CA3D 8351 Confidentiality cannot be guaranteed on emails sent or received unencrypted --cQe8am69YhIDeLD5 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEEoov0DD5VE3JmLRT3Qarn3Mo9g1EFAmdVSgMACgkQQarn3Mo9 g1F0DxAAr0NcsqlfxewgCVd0TsOaPOkT5YPAHDVxZU7SRRoUi/G8dWVnYW3njh5a FGyxfUwKElpDgfz9xUOfP1J/dw3iaktW7Bzd/pY7vL8ZpaIeaft0HzVBLX2dHF3q lwExnBcDq08S53k6RuJyNr7GvOTw7jfN+Ss7AWOGEOWBOJ6Fa41wmnEdiHth1v5X PuTlWeeRVWU5WKE/OgNMmuoqSrKXzu6ImOl6S3mjXf4MkEFdd2f2KXv1xiJpuikb 7VdnGeRvxCnqvrDxKaxf+gxhzNLN4uM9ZrjFxRpcFpVx6oighUmavIB+AgmLhi1c PGGPB0NJRuP7qVHf7/wssQEsVzTjBoHIKmZf15E1T7EVxBoXvnJAwN1x0ZGRqzFK ODIMoGUpu2/TqU+M37kWOfxkWABwN1ioylRas1duL5L/wwVnN/5JCu04PdHq+K5Z zxpUiqCIOjNeu2U/Hma3rmAZ3hp3N1kXcrqtPAiYFHE2y7mgnT5vfjnmpeHYsjWM RCcgpoKThbLHgDACDIPxUfEzKqiZl7tvft5T5W9HRA26AOKleiPTYSry8EmlfH1M A/ByfX1SWvYPvdqN7Zrzn4tndDU3i3wpnKIXIMBbs7Dlts1TANPQm5vfSy1+OOAc ywSYg7/Q2jm6OWqPfdgokfs9mQcUs8CJ5GnZS0M60Du7cqjw4cQ= =zBN/ -----END PGP SIGNATURE----- --cQe8am69YhIDeLD5--
Efraim Flashner <efraim@HIDDEN>:bug-guix@HIDDEN.
Full text available.bug-guix@HIDDEN:bug#74731; Package guix.
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