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Fri, 10 Mar 2023 15:22:31 -0600 From: Mario Limonciello To: =?utf-8?b?SmFuIETEhWJyb8Wb?= , Grzegorz Bernacki , , , , Jarkko Nikula , Andy Shevchenko , Mika Westerberg CC: , Mario Limonciello , "Tom Lendacky" , , Subject: [PATCH v4 6/8] i2c: designware: Use PCI PSP driver for communication Date: Fri, 10 Mar 2023 15:19:49 -0600 Message-ID: <20230310211954.2490-7-mario.limonciello@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230310211954.2490-1-mario.limonciello@amd.com> References: <20230310211954.2490-1-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-TrafficTypeDiagnostic: DM6NAM11FT070:EE_|IA1PR12MB8359:EE_ X-MS-Office365-Filtering-Correlation-Id: 8bd8f7c2-2074-439e-b79b-08db21ad8fb3 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)(39860400002)(376002)(136003)(396003)(346002)(451199018)(36840700001)(46966006)(40470700004)(82310400005)(82740400003)(36860700001)(6666004)(83380400001)(47076005)(426003)(36756003)(478600001)(110136005)(54906003)(81166007)(356005)(316002)(40460700003)(336012)(186003)(2616005)(26005)(40480700001)(1076003)(16526019)(7696005)(5660300002)(2906002)(44832011)(70206006)(41300700001)(8676002)(70586007)(8936002)(86362001)(4326008)(36900700001);DIR:OUT;SFP:1101; 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Also the mailbox that is utilized for communication with the PSP may have other consumers in the kernel, so it's better to make all communication go through a single driver. Acked-by: Tom Lendacky Signed-off-by: Mario Limonciello Acked-by: Jarkko Nikula --- v3->v4: * Pick up tags v1->v2: * Fix Kconfig to use imply * Use IS_REACHABLE --- drivers/i2c/busses/Kconfig | 2 +- drivers/i2c/busses/i2c-designware-amdpsp.c | 142 ++------------------ drivers/i2c/busses/i2c-designware-core.h | 1 - drivers/i2c/busses/i2c-designware-platdrv.c | 1 - include/linux/psp-platform-access.h | 1 + 5 files changed, 11 insertions(+), 136 deletions(-) diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index 25eb4e8fd22f..d53bf716f97d 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -566,9 +566,9 @@ config I2C_DESIGNWARE_PLATFORM config I2C_DESIGNWARE_AMDPSP bool "AMD PSP I2C semaphore support" - depends on X86_MSR depends on ACPI depends on I2C_DESIGNWARE_PLATFORM + imply CRYPTO_DEV_SP_PSP help This driver enables managed host access to the selected I2C bus shared between AMD CPU and AMD PSP. diff --git a/drivers/i2c/busses/i2c-designware-amdpsp.c b/drivers/i2c/busses/i2c-designware-amdpsp.c index 652e6b64bd5f..105584abcf8f 100644 --- a/drivers/i2c/busses/i2c-designware-amdpsp.c +++ b/drivers/i2c/busses/i2c-designware-amdpsp.c @@ -1,11 +1,8 @@ // SPDX-License-Identifier: GPL-2.0 -#include -#include #include -#include +#include #include -#include #include #include @@ -13,23 +10,15 @@ #include "i2c-designware-core.h" #define MSR_AMD_PSP_ADDR 0xc00110a2 -#define PSP_MBOX_OFFSET 0x10570 -#define PSP_CMD_TIMEOUT_US (500 * USEC_PER_MSEC) #define PSP_I2C_RESERVATION_TIME_MS 100 -#define PSP_I2C_REQ_BUS_CMD 0x64 #define PSP_I2C_REQ_RETRY_CNT 400 #define PSP_I2C_REQ_RETRY_DELAY_US (25 * USEC_PER_MSEC) #define PSP_I2C_REQ_STS_OK 0x0 #define PSP_I2C_REQ_STS_BUS_BUSY 0x1 #define PSP_I2C_REQ_STS_INV_PARAM 0x3 -struct psp_req_buffer_hdr { - u32 total_size; - u32 status; -}; - enum psp_i2c_req_type { PSP_I2C_REQ_ACQUIRE, PSP_I2C_REQ_RELEASE, @@ -41,119 +30,12 @@ struct psp_i2c_req { enum psp_i2c_req_type type; }; -struct psp_mbox { - u32 cmd_fields; - u64 i2c_req_addr; -} __packed; - static DEFINE_MUTEX(psp_i2c_access_mutex); static unsigned long psp_i2c_sem_acquired; -static void __iomem *mbox_iomem; static u32 psp_i2c_access_count; static bool psp_i2c_mbox_fail; static struct device *psp_i2c_dev; -/* - * Implementation of PSP-x86 i2c-arbitration mailbox introduced for AMD Cezanne - * family of SoCs. - */ - -static int psp_get_mbox_addr(unsigned long *mbox_addr) -{ - unsigned long long psp_mmio; - - if (rdmsrl_safe(MSR_AMD_PSP_ADDR, &psp_mmio)) - return -EIO; - - *mbox_addr = (unsigned long)(psp_mmio + PSP_MBOX_OFFSET); - - return 0; -} - -static int psp_mbox_probe(void) -{ - unsigned long mbox_addr; - int ret; - - ret = psp_get_mbox_addr(&mbox_addr); - if (ret) - return ret; - - mbox_iomem = ioremap(mbox_addr, sizeof(struct psp_mbox)); - if (!mbox_iomem) - return -ENOMEM; - - return 0; -} - -/* Recovery field should be equal 0 to start sending commands */ -static int psp_check_mbox_recovery(struct psp_mbox __iomem *mbox) -{ - u32 tmp; - - tmp = readl(&mbox->cmd_fields); - - return FIELD_GET(PSP_CMDRESP_RECOVERY, tmp); -} - -static int psp_wait_cmd(struct psp_mbox __iomem *mbox) -{ - u32 tmp, expected; - - /* Expect mbox_cmd to be cleared and the response bit to be set by PSP */ - expected = FIELD_PREP(PSP_CMDRESP_RESP, 1); - - /* - * Check for readiness of PSP mailbox in a tight loop in order to - * process further as soon as command was consumed. - */ - return readl_poll_timeout(&mbox->cmd_fields, tmp, (tmp == expected), - 0, PSP_CMD_TIMEOUT_US); -} - -/* Status equal to 0 means that PSP succeed processing command */ -static u32 psp_check_mbox_sts(struct psp_mbox __iomem *mbox) -{ - u32 cmd_reg; - - cmd_reg = readl(&mbox->cmd_fields); - - return FIELD_GET(PSP_CMDRESP_STS, cmd_reg); -} - -static int psp_send_cmd(struct psp_i2c_req *req) -{ - struct psp_mbox __iomem *mbox = mbox_iomem; - phys_addr_t req_addr; - u32 cmd_reg; - - if (psp_check_mbox_recovery(mbox)) - return -EIO; - - if (psp_wait_cmd(mbox)) - return -EBUSY; - - /* - * Fill mailbox with address of command-response buffer, which will be - * used for sending i2c requests as well as reading status returned by - * PSP. Use physical address of buffer, since PSP will map this region. - */ - req_addr = __psp_pa((void *)req); - writeq(req_addr, &mbox->i2c_req_addr); - - /* Write command register to trigger processing */ - cmd_reg = FIELD_PREP(PSP_CMDRESP_CMD, PSP_I2C_REQ_BUS_CMD); - writel(cmd_reg, &mbox->cmd_fields); - - if (psp_wait_cmd(mbox)) - return -ETIMEDOUT; - - if (psp_check_mbox_sts(mbox)) - return -EIO; - - return 0; -} - /* Helper to verify status returned by PSP */ static int check_i2c_req_sts(struct psp_i2c_req *req) { @@ -182,10 +64,10 @@ static int psp_send_check_i2c_req(struct psp_i2c_req *req) * 2. i2c-requests - PSP refuses to grant i2c arbitration to x86 for too * long. * In order to distinguish between these two in error handling code, all - * errors on the first level (returned by psp_send_cmd) are shadowed by + * errors on the first level (returned by psp_send_platform_access_msg) are shadowed by * -EIO. */ - if (psp_send_cmd(req)) + if (psp_send_platform_access_msg(PSP_I2C_REQ_BUS_CMD, (struct psp_request *)req)) return -EIO; return check_i2c_req_sts(req); @@ -202,7 +84,7 @@ static int psp_send_i2c_req(enum psp_i2c_req_type i2c_req_type) if (!req) return -ENOMEM; - req->hdr.total_size = sizeof(*req); + req->hdr.payload_size = sizeof(*req); req->type = i2c_req_type; start = jiffies; @@ -381,7 +263,8 @@ static const struct i2c_lock_operations i2c_dw_psp_lock_ops = { int i2c_dw_amdpsp_probe_lock_support(struct dw_i2c_dev *dev) { - int ret; + if (!IS_REACHABLE(CRYPTO_DEV_CCP_DD)) + return -ENODEV; if (!dev) return -ENODEV; @@ -393,11 +276,10 @@ int i2c_dw_amdpsp_probe_lock_support(struct dw_i2c_dev *dev) if (psp_i2c_dev) return -EEXIST; - psp_i2c_dev = dev->dev; + if (psp_check_platform_access_status()) + return -EPROBE_DEFER; - ret = psp_mbox_probe(); - if (ret) - return ret; + psp_i2c_dev = dev->dev; dev_info(psp_i2c_dev, "I2C bus managed by AMD PSP\n"); @@ -411,9 +293,3 @@ int i2c_dw_amdpsp_probe_lock_support(struct dw_i2c_dev *dev) return 0; } - -/* Unmap area used as a mailbox with PSP */ -void i2c_dw_amdpsp_remove_lock_support(struct dw_i2c_dev *dev) -{ - iounmap(mbox_iomem); -} diff --git a/drivers/i2c/busses/i2c-designware-core.h b/drivers/i2c/busses/i2c-designware-core.h index 050d8c63ad3c..c5d87aae39c6 100644 --- a/drivers/i2c/busses/i2c-designware-core.h +++ b/drivers/i2c/busses/i2c-designware-core.h @@ -383,7 +383,6 @@ int i2c_dw_baytrail_probe_lock_support(struct dw_i2c_dev *dev); #if IS_ENABLED(CONFIG_I2C_DESIGNWARE_AMDPSP) int i2c_dw_amdpsp_probe_lock_support(struct dw_i2c_dev *dev); -void i2c_dw_amdpsp_remove_lock_support(struct dw_i2c_dev *dev); #endif int i2c_dw_validate_speed(struct dw_i2c_dev *dev); diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c index 74182db03a88..89ad88c54754 100644 --- a/drivers/i2c/busses/i2c-designware-platdrv.c +++ b/drivers/i2c/busses/i2c-designware-platdrv.c @@ -214,7 +214,6 @@ static const struct i2c_dw_semaphore_callbacks i2c_dw_semaphore_cb_table[] = { #ifdef CONFIG_I2C_DESIGNWARE_AMDPSP { .probe = i2c_dw_amdpsp_probe_lock_support, - .remove = i2c_dw_amdpsp_remove_lock_support, }, #endif {} diff --git a/include/linux/psp-platform-access.h b/include/linux/psp-platform-access.h index 977df5cfd494..f5a03cd11f10 100644 --- a/include/linux/psp-platform-access.h +++ b/include/linux/psp-platform-access.h @@ -7,6 +7,7 @@ enum psp_platform_access_msg { PSP_CMD_NONE = 0x0, + PSP_I2C_REQ_BUS_CMD = 0x64, }; struct psp_req_buffer_hdr {