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Miller" , , Subject: [PATCH v2 7/9] crypto: ccp: Add support for ringing a platform doorbell Date: Thu, 2 Mar 2023 13:42:30 -0600 Message-ID: <20230302194235.1724-8-mario.limonciello@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230302194235.1724-1-mario.limonciello@amd.com> References: <20230302194235.1724-1-mario.limonciello@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain 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-TrafficTypeDiagnostic: BN8NAM11FT026:EE_|BL3PR12MB6475:EE_ X-MS-Office365-Filtering-Correlation-Id: 1096de2f-4834-4269-c8e0-08db1b56620c 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:(13230025)(4636009)(136003)(396003)(346002)(376002)(39860400002)(451199018)(40470700004)(36840700001)(46966006)(478600001)(110136005)(83380400001)(6636002)(316002)(54906003)(426003)(86362001)(7696005)(2616005)(82310400005)(36860700001)(336012)(81166007)(47076005)(26005)(36756003)(966005)(186003)(82740400003)(16526019)(356005)(1076003)(40460700003)(6666004)(40480700001)(2906002)(70206006)(8936002)(44832011)(5660300002)(41300700001)(4326008)(70586007)(8676002)(36900700001)(134885004);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Mar 2023 19:43:22.8887 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1096de2f-4834-4269-c8e0-08db1b56620c 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: BN8NAM11FT026.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL3PR12MB6475 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Some platforms support using a doorbell to communicate. Export this feature for other drivers to utilize as well. Link: https://lore.kernel.org/linux-i2c/20220916131854.687371-3-jsd@semihalf.com/ Suggested-by: Jan Dabros Signed-off-by: Mario Limonciello --- v1->v2: * New patch --- drivers/crypto/ccp/platform-access.c | 47 ++++++++++++++++++++++++++++ drivers/crypto/ccp/sp-dev.h | 1 + include/linux/psp-platform-access.h | 15 +++++++++ include/linux/psp.h | 3 ++ 4 files changed, 66 insertions(+) diff --git a/drivers/crypto/ccp/platform-access.c b/drivers/crypto/ccp/platform-access.c index af3a1e97abfe..0763389a2814 100644 --- a/drivers/crypto/ccp/platform-access.c +++ b/drivers/crypto/ccp/platform-access.c @@ -135,6 +135,53 @@ int psp_send_platform_access_msg(enum psp_platform_access_msg msg, } EXPORT_SYMBOL_GPL(psp_send_platform_access_msg); +int psp_ring_platform_doorbell(enum psp_platform_access_msg msg) +{ + struct psp_device *psp = psp_get_master_device(); + struct psp_platform_access_device *pa_dev; + u32 __iomem *drbl; + u32 drbl_reg; + int ret; + + if (!psp || !psp->platform_access_data) + return -ENODEV; + + pa_dev = psp->platform_access_data; + drbl = psp->io_regs + pa_dev->vdata->doorbell_reg; + + if (!drbl) + return -ENODEV; + + mutex_lock(&pa_dev->mutex); + + if (check_recovery(drbl)) { + dev_dbg(psp->dev, "in recovery\n"); + ret = -EBUSY; + goto unlock; + } + + if (wait_cmd(drbl)) { + dev_dbg(psp->dev, "not done processing command\n"); + ret = -EBUSY; + goto unlock; + } + + drbl_reg = FIELD_PREP(PSP_DRBL_MSG, msg) | PSP_DRBL_RING; + iowrite32(drbl_reg, drbl); + + if (wait_cmd(drbl)) { + ret = -ETIMEDOUT; + goto unlock; + } + + ret = 0; +unlock: + mutex_unlock(&pa_dev->mutex); + + return ret; +} +EXPORT_SYMBOL_GPL(psp_ring_platform_doorbell); + void platform_access_dev_destroy(struct psp_device *psp) { struct psp_platform_access_device *pa_dev = psp->platform_access_data; diff --git a/drivers/crypto/ccp/sp-dev.h b/drivers/crypto/ccp/sp-dev.h index 5ec6c219a731..87c0b9350bc2 100644 --- a/drivers/crypto/ccp/sp-dev.h +++ b/drivers/crypto/ccp/sp-dev.h @@ -54,6 +54,7 @@ struct tee_vdata { }; struct platform_access_vdata { + const unsigned int doorbell_reg; const unsigned int cmdresp_reg; const unsigned int cmdbuff_addr_lo_reg; const unsigned int cmdbuff_addr_hi_reg; diff --git a/include/linux/psp-platform-access.h b/include/linux/psp-platform-access.h index f5a03cd11f10..1e1d0e077cec 100644 --- a/include/linux/psp-platform-access.h +++ b/include/linux/psp-platform-access.h @@ -35,6 +35,21 @@ struct psp_request { */ int psp_send_platform_access_msg(enum psp_platform_access_msg, struct psp_request *req); +/** + * psp_ring_platform_doorbell() - Ring platform doorbell + * + * This function is intended to be used by drivers outside of ccp to ring the + * platform doorbell with a message. + * + * Returns: + * 0: success + * -%EBUSY: mailbox in recovery or in use + * -%ENODEV: driver not bound with PSP device + * -%ETIMEDOUT: request timed out + * -%EIO: unknown error (see kernel log) + */ +int psp_ring_platform_doorbell(enum psp_platform_access_msg); + /** * psp_check_platform_access_status() - Checks whether platform features is ready * diff --git a/include/linux/psp.h b/include/linux/psp.h index d3424790a70e..92e60aeef21e 100644 --- a/include/linux/psp.h +++ b/include/linux/psp.h @@ -23,4 +23,7 @@ #define PSP_CMDRESP_RECOVERY BIT(30) #define PSP_CMDRESP_RESP BIT(31) +#define PSP_DRBL_MSG PSP_CMDRESP_CMD +#define PSP_DRBL_RING BIT(0) + #endif /* __PSP_H */ -- 2.34.1