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Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by BN1PEPF00004689.mail.protection.outlook.com (10.167.243.134) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.8093.14 via Frontend Transport; Fri, 25 Oct 2024 19:31:27 +0000 Received: from AUS-P9-MLIMONCI.xilinx.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Fri, 25 Oct 2024 14:31:24 -0500 From: Mario Limonciello To: Hans de Goede , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= CC: "Rafael J . Wysocki" , Len Brown , Maximilian Luz , Lee Chun-Yi , "Shyam Sundar S K" , Corentin Chary , "Luke D . Jones" , Ike Panhc , Henrique de Moraes Holschuh , "Alexis Belmonte" , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , Ai Chao , Gergo Koteles , open list , "open list:ACPI" , "open list:MICROSOFT SURFACE PLATFORM PROFILE DRIVER" , "open list:THINKPAD ACPI EXTRAS DRIVER" , Mark Pearson , Matthew Schwartz , Mario Limonciello Subject: [PATCH 7/8] ACPI: platform_profile: Add support for multiple handlers Date: Fri, 25 Oct 2024 14:30:54 -0500 Message-ID: <20241025193055.2235-8-mario.limonciello@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241025193055.2235-1-mario.limonciello@amd.com> References: <20241025193055.2235-1-mario.limonciello@amd.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN1PEPF00004689:EE_|DM4PR12MB7694:EE_ X-MS-Office365-Filtering-Correlation-Id: 8b7c0259-3995-4fa2-d020-08dcf52b9ed9 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|36860700013|7416014|1800799024|82310400026; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?FRo7iDhYkeFv/Z9mOomfQLeeg3o9sfS/DBoE5HS210kpkZoewUrXkr/3mve5?= =?us-ascii?Q?R/WBKE65c9ye8Vt4yieU4ESPGmzMNkxEAGhh3LXSQBNknql1Mrb6QcmTShQ0?= =?us-ascii?Q?fgoBrAgibEOTaTq6VCnhVIc/9kVb1LA1qrSLAzkSC1EyJ+3JPZtVYZJVaJEC?= =?us-ascii?Q?TkaSaFOtvStfsVNt7hwOxVTX2wbDaY3pqOM86JWQ4I8TxFnmj5ICvbihh8U7?= =?us-ascii?Q?i5FrcekvlXu4BoTGs3N2T1mq6EAtga1EtfwagGI+9WUTnRQTthzmSNl2x/ZW?= =?us-ascii?Q?aPYBGly4RacGkXT6koyjCtHS+lKpNetcJH9qZcWxExYqQ1TMZDBuxl0NpBBt?= =?us-ascii?Q?fYrZI3aWUHTlaGhe69YH9nMDaEZupevPZFEt7x1fh+NXNT1LR8+oo4omtm4B?= =?us-ascii?Q?ntgs0olWBACoIVHmHVmjdHL9fSrVWI7r3t/bGIOEulj+bnJN9vDvIq+S4+b9?= =?us-ascii?Q?Oy7SC4Cs+AgX8n/9YkVfDYzQgnS97A2poTc/mihRaUNV0PzQRNJL95SenqK2?= =?us-ascii?Q?Efr/oGEsrbqXVzwC1wEnFV5gh/qFGjRxMD3tefULRzGCbeyOXS8cE2l872Uv?= =?us-ascii?Q?th3IQIm6Z+7coPmK2CN3JdkU7a7Kl26ufrcufDlVSkNyQ/5fSeHii7z9Ol8a?= =?us-ascii?Q?X+Y80H9pk87hvBsH2EigUef03OGKogoo1KgDUggos1X3kr6ld1AnnO+737Z5?= =?us-ascii?Q?GPqUa+zv4btIFvr73hl7H6ocTYiVN5bShLHJEwJYpj5qOQifR9nYYUop7cDM?= =?us-ascii?Q?yyzX8BXOh747DAzEAfA8uZiJoGKfaK8jpo1dYM4zNdKahDEWsOGhk9o1pTr+?= =?us-ascii?Q?XlAMnA6LsqXnrBot0ymGDyAUDn9ZPHuH4OS4X/gv1pscp2Ya5eop/O2VXH3t?= =?us-ascii?Q?2g60872m9qW+IXaGSwr1XwmR52K879XRU0IZkSl6qXbaQzRWYaMdsXoRBC6o?= =?us-ascii?Q?e5JQ0Xwm9RoZxmhWJNh+LKyk8IcDCIrrNOi/OjyWQIzPYxtrJvNJS5gVcScC?= =?us-ascii?Q?2+MI7D08rk6yZR+zQXgL6C+CGlzCOogjSwef/A5hJrHQLxgsyp02N7ie2aEr?= =?us-ascii?Q?UPuYsqOG+5D8CYedcklEN67+k5bwLBOnl2grHgWlCrbQP8Ckrw6wwNtjTViG?= =?us-ascii?Q?aYnKx5W0kgmk24Mj4gez/xwW4AARE3BVBuRlYXjGHwm1c49o0XhwnJCWVP63?= =?us-ascii?Q?HnvcMMgxNes6lFBAGHEZ3MSgJ6ojBt2//DMJI5r2VFhTCDVME6FeOyPuzi4G?= =?us-ascii?Q?sBvYX+YCnSueJ5ZQpHAvQsC5a+At1WWYX4zyQggstMbXn1waOFiXjPXS07hJ?= =?us-ascii?Q?X/OPG35+lNZeeiKKxmF/WUvq8ERPIU2uo9k3m53qhN8bgbNoXTcA3nmA3Lwq?= =?us-ascii?Q?2dIP/3d6vQBA/qpIqy59Opvz/L5YQV9oCR1GZLNPPpmPMrgquw=3D=3D?= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(376014)(36860700013)(7416014)(1800799024)(82310400026);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Oct 2024 19:31:27.6616 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8b7c0259-3995-4fa2-d020-08dcf52b9ed9 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN1PEPF00004689.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB7694 Content-Type: text/plain; charset="utf-8" Multiple drivers may attempt to register platform profile handlers, but only one may be registered and the behavior is non-deterministic for which one wins. It's mostly controlled by probing order. This can be problematic if one driver changes CPU settings and another driver notifies the EC for changing fan curves. Modify the ACPI platform profile handler to let multiple drivers register platform profile handlers and abstract this detail from userspace. From userspace perspective the user will see profiles available across both drivers. However to avoid chaos only allow changing to profiles that are common in both drivers. If any problems occur when changing profiles for any driver, then revert back to the previous profile. Tested-by: Matthew Schwartz Signed-off-by: Mario Limonciello --- drivers/acpi/platform_profile.c | 203 ++++++++++++++++++-------------- 1 file changed, 117 insertions(+), 86 deletions(-) diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profil= e.c index 091ca6941a925..915e3c49f0b5f 100644 --- a/drivers/acpi/platform_profile.c +++ b/drivers/acpi/platform_profile.c @@ -9,7 +9,6 @@ #include #include =20 -static struct platform_profile_handler *cur_profile; static LIST_HEAD(platform_profile_handler_list); static DEFINE_MUTEX(profile_lock); =20 @@ -36,26 +35,26 @@ static ssize_t platform_profile_choices_show(struct dev= ice *dev, struct device_attribute *attr, char *buf) { + struct platform_profile_handler *handler; + unsigned long seen =3D 0; int len =3D 0; - int err, i; - - err =3D mutex_lock_interruptible(&profile_lock); - if (err) - return err; - - if (!cur_profile) { - mutex_unlock(&profile_lock); - return -ENODEV; + int i; + + scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &profile_lock) { + list_for_each_entry(handler, &platform_profile_handler_list, list) { + for_each_set_bit(i, handler->choices, PLATFORM_PROFILE_LAST) { + if (seen & BIT(i)) + continue; + if (len =3D=3D 0) + len +=3D sysfs_emit_at(buf, len, "%s", profile_names[i]); + else + len +=3D sysfs_emit_at(buf, len, " %s", profile_names[i]); + seen |=3D BIT(i); + } + } } =20 - for_each_set_bit(i, cur_profile->choices, PLATFORM_PROFILE_LAST) { - if (len =3D=3D 0) - len +=3D sysfs_emit_at(buf, len, "%s", profile_names[i]); - else - len +=3D sysfs_emit_at(buf, len, " %s", profile_names[i]); - } len +=3D sysfs_emit_at(buf, len, "\n"); - mutex_unlock(&profile_lock); return len; } =20 @@ -64,22 +63,20 @@ static ssize_t platform_profile_show(struct device *dev, char *buf) { enum platform_profile_option profile =3D PLATFORM_PROFILE_BALANCED; + struct platform_profile_handler *handler; int err; =20 - err =3D mutex_lock_interruptible(&profile_lock); - if (err) - return err; =20 - if (!cur_profile) { - mutex_unlock(&profile_lock); - return -ENODEV; + scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &profile_lock) { + if (!platform_profile_is_registered()) + return -ENODEV; + list_for_each_entry(handler, &platform_profile_handler_list, list) { + err =3D handler->profile_get(handler, &profile); + if (err) + return err; + } } =20 - err =3D cur_profile->profile_get(cur_profile, &profile); - mutex_unlock(&profile_lock); - if (err) - return err; - /* Check that profile is valid index */ if (WARN_ON((profile < 0) || (profile >=3D ARRAY_SIZE(profile_names)))) return -EIO; @@ -91,37 +88,48 @@ static ssize_t platform_profile_store(struct device *de= v, struct device_attribute *attr, const char *buf, size_t count) { + struct platform_profile_handler *handler; + enum platform_profile_option profile; int err, i; =20 - err =3D mutex_lock_interruptible(&profile_lock); - if (err) - return err; - - if (!cur_profile) { - mutex_unlock(&profile_lock); - return -ENODEV; - } - /* Scan for a matching profile */ i =3D sysfs_match_string(profile_names, buf); if (i < 0) { - mutex_unlock(&profile_lock); return -EINVAL; } =20 - /* Check that platform supports this profile choice */ - if (!test_bit(i, cur_profile->choices)) { - mutex_unlock(&profile_lock); - return -EOPNOTSUPP; + scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &profile_lock) { + if (!platform_profile_is_registered()) + return -ENODEV; + + /* Check that all handlers support this profile choice */ + list_for_each_entry(handler, &platform_profile_handler_list, list) { + if (!test_bit(i, handler->choices)) + return -EOPNOTSUPP; + + /* save the profile so that it can be reverted if necessary */ + err =3D handler->profile_get(handler, &profile); + if (err) + return err; + } + + list_for_each_entry(handler, &platform_profile_handler_list, list) { + err =3D handler->profile_set(handler, i); + if (err) { + pr_err("Failed to set profile for handler %s\n", handler->name); + break; + } + } + if (err) { + list_for_each_entry_continue_reverse(handler, &platform_profile_handler= _list, list) { + if (handler->profile_set(handler, profile)) + pr_err("Failed to revert profile for handler %s\n", handler->name); + } + return err; + } } =20 - err =3D cur_profile->profile_set(cur_profile, i); - if (!err) - sysfs_notify(acpi_kobj, NULL, "platform_profile"); - - mutex_unlock(&profile_lock); - if (err) - return err; + sysfs_notify(acpi_kobj, NULL, "platform_profile"); return count; } =20 @@ -140,7 +148,8 @@ static const struct attribute_group platform_profile_gr= oup =3D { =20 void platform_profile_notify(void) { - if (!cur_profile) + guard(mutex)(&profile_lock); + if (!platform_profile_is_registered()) return; sysfs_notify(acpi_kobj, NULL, "platform_profile"); } @@ -148,40 +157,65 @@ EXPORT_SYMBOL_GPL(platform_profile_notify); =20 int platform_profile_cycle(void) { + struct platform_profile_handler *handler; enum platform_profile_option profile; - enum platform_profile_option next; + enum platform_profile_option next =3D PLATFORM_PROFILE_LAST; + enum platform_profile_option next2 =3D PLATFORM_PROFILE_LAST; int err; =20 - err =3D mutex_lock_interruptible(&profile_lock); - if (err) - return err; - - if (!cur_profile) { - mutex_unlock(&profile_lock); - return -ENODEV; - } - - err =3D cur_profile->profile_get(cur_profile, &profile); - if (err) { - mutex_unlock(&profile_lock); - return err; - } - - next =3D find_next_bit_wrap(cur_profile->choices, PLATFORM_PROFILE_LAST, - profile + 1); - - if (WARN_ON(next =3D=3D PLATFORM_PROFILE_LAST)) { - mutex_unlock(&profile_lock); - return -EINVAL; + scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &profile_lock) { + /* first pass, make sure all handlers agree on the definition of "next" = profile */ + list_for_each_entry(handler, &platform_profile_handler_list, list) { + + err =3D handler->profile_get(handler, &profile); + if (err) + return err; + + if (next =3D=3D PLATFORM_PROFILE_LAST) + next =3D find_next_bit_wrap(handler->choices, + PLATFORM_PROFILE_LAST, + profile + 1); + else + next2 =3D find_next_bit_wrap(handler->choices, + PLATFORM_PROFILE_LAST, + profile + 1); + + if (WARN_ON(next =3D=3D PLATFORM_PROFILE_LAST)) + return -EINVAL; + + if (next2 =3D=3D PLATFORM_PROFILE_LAST) + continue; + + if (next !=3D next2) { + pr_warn("Next profile to cycle to is ambiguous between platform_profil= e handlers\n"); + return -EINVAL; + } + next =3D next2; + } + + /* + * Second pass: apply "next" to each handler + * If any failures occur unwind and revert all back to the original prof= ile + */ + list_for_each_entry(handler, &platform_profile_handler_list, list) { + err =3D handler->profile_set(handler, next); + if (err) { + pr_err("Failed to set profile for handler %s\n", handler->name); + break; + } + } + if (err) { + list_for_each_entry_continue_reverse(handler, &platform_profile_handler= _list, list) { + err =3D handler->profile_set(handler, profile); + if (err) + pr_err("Failed to revert profile for handler %s\n", handler->name); + } + } } =20 - err =3D cur_profile->profile_set(cur_profile, next); - mutex_unlock(&profile_lock); - - if (!err) - sysfs_notify(acpi_kobj, NULL, "platform_profile"); + sysfs_notify(acpi_kobj, NULL, "platform_profile"); =20 - return err; + return 0; } EXPORT_SYMBOL_GPL(platform_profile_cycle); =20 @@ -190,21 +224,19 @@ int platform_profile_register(struct platform_profile= _handler *pprof) int err; =20 guard(mutex)(&profile_lock); - /* We can only have one active profile */ - if (cur_profile) - return -EEXIST; =20 /* Sanity check the profile handler field are set */ if (!pprof || bitmap_empty(pprof->choices, PLATFORM_PROFILE_LAST) || !pprof->profile_set || !pprof->profile_get) return -EINVAL; =20 - err =3D sysfs_create_group(acpi_kobj, &platform_profile_group); - if (err) - return err; + if (!platform_profile_is_registered()) { + err =3D sysfs_create_group(acpi_kobj, &platform_profile_group); + if (err) + return err; + } list_add_tail(&pprof->list, &platform_profile_handler_list); =20 - cur_profile =3D pprof; return 0; } EXPORT_SYMBOL_GPL(platform_profile_register); @@ -215,7 +247,6 @@ int platform_profile_remove(struct platform_profile_han= dler *pprof) =20 list_del(&pprof->list); =20 - cur_profile =3D NULL; if (!platform_profile_is_registered()) sysfs_remove_group(acpi_kobj, &platform_profile_group); =20 --=20 2.43.0