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Wysocki" , CC: Mika Westerberg , , , , , "Mario Limonciello" Subject: [PATCH v3 2/3] ACPI: bus: Allow negotiating OSC capabilities Date: Mon, 28 Feb 2022 12:14:45 -0600 Message-ID: <20220228181446.1975420-2-mario.limonciello@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220228181446.1975420-1-mario.limonciello@amd.com> References: <20220228181446.1975420-1-mario.limonciello@amd.com> MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] 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-Office365-Filtering-Correlation-Id: 9d957138-1fdb-46e4-d8be-08d9fae6886b X-MS-TrafficTypeDiagnostic: SN1PR12MB2559:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 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:(13230001)(4636009)(46966006)(40470700004)(36840700001)(2906002)(8676002)(110136005)(4326008)(70586007)(70206006)(508600001)(8936002)(5660300002)(6666004)(2616005)(1076003)(36756003)(54906003)(316002)(44832011)(81166007)(16526019)(336012)(186003)(47076005)(426003)(36860700001)(83380400001)(26005)(82310400004)(86362001)(40460700003)(356005)(36900700001); DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Feb 2022 18:17:08.7202 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9d957138-1fdb-46e4-d8be-08d9fae6886b 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: BN8NAM11FT016.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN1PR12MB2559 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Currently when capabilities have been masked by firmware during a negotiation with OSC_QUERY_ENABLE set they're silently ignored by the caller. If the caller calls `acpi_run_osc` again without query set and the same capabilities, then they instead get a failure possibly leading to downstream problems. So instead when query is set return AE_SUPPORT which callers can then use for determining that capabilities were masked. Signed-off-by: Mario Limonciello --- Changes from v2->v3: * Add kernel doc for the acpi_run_osc function * Correct a logic error drivers/acpi/bus.c | 26 ++++++++++++++++++++------ 1 file changed, 20 insertions(+), 6 deletions(-) diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c index 07f604832fd6..81647591ec27 100644 --- a/drivers/acpi/bus.c +++ b/drivers/acpi/bus.c @@ -184,6 +184,18 @@ static void acpi_print_osc_error(acpi_handle handle, pr_debug("\n"); } +/** + * acpi_run_osc - Evaluate the _OSC method for a given ACPI handle + * @handle: ACPI handle containing _OSC to evaluate + * @context: A structure specifying UUID, revision, and buffer for data + * + * Used for negotiating with firmware the capabilities that will be used + * by the OSPM. Although the return type is acpi_status, the ACPI_SUCCESS + * macro can not be used to determine whether to free the buffer of + * returned data. + * + * The buffer must be freed when this function returns AE_OK or AE_SUCCESS. + */ acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context) { acpi_status status; @@ -243,16 +255,19 @@ acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context) acpi_print_osc_error(handle, context, "_OSC invalid revision"); if (errors & OSC_CAPABILITIES_MASK_ERROR) { + acpi_print_osc_error(handle, context, "_OSC capabilities masked"); if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD] - & OSC_QUERY_ENABLE) - goto out_success; - status = AE_SUPPORT; - goto out_kfree; + & OSC_QUERY_ENABLE) { + status = AE_SUPPORT; + goto out_masked; + } } status = AE_ERROR; goto out_kfree; } -out_success: + + status = AE_OK; +out_masked: context->ret.length = out_obj->buffer.length; context->ret.pointer = kmemdup(out_obj->buffer.pointer, context->ret.length, GFP_KERNEL); @@ -260,7 +275,6 @@ acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context) status = AE_NO_MEMORY; goto out_kfree; } - status = AE_OK; out_kfree: kfree(output.pointer);