From patchwork Wed Nov 23 20:46:15 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Sibi Sankar X-Patchwork-Id: 13054285 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2F5E6C46467 for ; Wed, 23 Nov 2022 20:48:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240089AbiKWUst (ORCPT ); Wed, 23 Nov 2022 15:48:49 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43382 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236833AbiKWUq4 (ORCPT ); Wed, 23 Nov 2022 15:46:56 -0500 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8A8D911474; Wed, 23 Nov 2022 12:46:54 -0800 (PST) Received: from pps.filterd (m0279863.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 2ANEIit1017538; Wed, 23 Nov 2022 20:46:47 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type : content-transfer-encoding; s=qcppdkim1; bh=z6f87EZDKH9K0rqUrHMwlq6wu1chU5yeC2DfnK3QVUg=; b=S4e19Qyx1zHjsQn+1o7JHBbJUky+PA17vgPqxtq0lzlZq2uxDgsq5OZbAgeLfF/UISSB SRdicKggsJ2gfX6VKb3uuaQ2nCJmcygGDL0urgo8UXnktYCZf5OApOu9SYuyxSSwGxnF 2kx3wuKOVWXmW4hiVaKjl5LuHSn1uzelenIDI2tYsWC7EkHW81k9m01e4OwtikTUmJjM QveblFH7xwqIRfDM5Nr1uirFXurVLbjw5kxzoEjTAaAhn2ee8YAla/EPinhy/bkr/1Q3 PKLT0zu/yTCETPHbieTJh8Fb5EImcbpVvSePLRSzlM6uKlnEZWyuRcnA3IU4pdncrGaj Wg== Received: from nalasppmta03.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3m0vmw5h4q-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 23 Nov 2022 20:46:47 +0000 Received: from nalasex01a.na.qualcomm.com (nalasex01a.na.qualcomm.com [10.47.209.196]) by NALASPPMTA03.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 2ANKkkMx014513 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 23 Nov 2022 20:46:46 GMT Received: from blr-ubuntu-87.ap.qualcomm.com (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.36; Wed, 23 Nov 2022 12:46:42 -0800 From: Sibi Sankar To: CC: , , , , , , , , , , Sibi Sankar Subject: [PATCH V5 2/2] firmware: qcom: scm: Add wait-queue handling logic Date: Thu, 24 Nov 2022 02:16:15 +0530 Message-ID: <20221123204615.25358-3-quic_sibis@quicinc.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20221123204615.25358-1-quic_sibis@quicinc.com> References: <20221123204615.25358-1-quic_sibis@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nalasex01a.na.qualcomm.com (10.47.209.196) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: Db5Ry2OJSIlAGz62MuUIA-cAvUO8jPKX X-Proofpoint-GUID: Db5Ry2OJSIlAGz62MuUIA-cAvUO8jPKX X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.895,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-11-23_11,2022-11-23_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 malwarescore=0 spamscore=0 mlxlogscore=999 priorityscore=1501 clxscore=1015 suspectscore=0 phishscore=0 impostorscore=0 adultscore=0 bulkscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2210170000 definitions=main-2211230153 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org From: Guru Das Srinagesh When the firmware (FW) supports multiple requests per VM, multiple requests from the same/different VM can reach the firmware at the same time. Since the firmware currently being used has limited resources, it guards them with a resource lock and puts requests on a wait-queue internally and signals to HLOS that it is doing so. It does this by returning a new return value in addition to success or error: SCM_WAITQ_SLEEP. A sleeping SCM call can be woken up by an interrupt that the FW raises. 1) SCM_WAITQ_SLEEP: When an SCM call receives this return value instead of success or error, FW has placed this call on a wait-queue and has signalled HLOS to put it to non-interruptible sleep. Along with this return value, FW also passes to HLOS `wq_ctx` - a unique number (UID) identifying the wait-queue that it has put the call on, internally. This is to help HLOS with its own bookkeeping to wake this sleeping call later. Additionally, FW also passes to HLOS `smc_call_ctx` - a UID identifying the SCM call thus being put to sleep. This is also for HLOS' bookkeeping to wake this call up later. These two additional values are passed via the a1 and a2 registers. N.B.: The "ctx" in the above UID names = "context". The handshake mechanism that HLOS uses to talk to FW about wait-queue operations involves two new SMC calls. 1) get_wq_ctx(): Arguments: None Returns: wq_ctx, flags, more_pending Get the wait-queue context, and wake up either one or all of the sleeping SCM calls associated with that wait-queue. Additionally, repeat this if there are more wait-queues that are ready to have their requests woken up (`more_pending`). 2) wq_resume(smc_call_ctx): Arguments: smc_call_ctx HLOS needs to issue this in response to receiving an IRQ, passing to FW the same smc_call_ctx that FW receives from HLOS via the get_wq_ctx() call. (The mechanism to wake a SMC call back up is described in detail below) VM_1 VM_2 Firmware │ │ │ │ │ │ │ │ │ │ │ │ │ REQUEST_1 │ │ ├────────────────────────┼─────────────────────────────────┤ │ │ │ │ │ ┌──┼──┐ │ │ │ │ │ │ │ REQUEST_2 │ │ │ │ ├──────────────────────────────┼──┤ │ │ │ │ │ │Resource │ │ │ │ │is busy │ │ {WQ_SLEEP} │ │ │ │ │◄─────────────────────────────┼──┤ │ │ │ wq_ctx, smc_call_ctx │ │ │ │ │ └──┼──┘ │ REQUEST_1 COMPLETE │ │ │◄───────────────────────┼─────────────────────────────────┤ │ │ │ │ │ IRQ │ │ │◄─-------------------------------│ │ │ │ │ │ get_wq_ctx() │ │ ├────────────────────────────────►│ │ │ │ │ │ │ │ │◄────────────────────────────────┤ │ │ wq_ctx, flags, and │ │ │ more_pending │ │ │ │ │ │ │ │ │ wq_resume(smc_call_ctx) │ │ ├────────────────────────────────►│ │ │ │ │ │ │ │ │ REQUEST_2 COMPLETE │ │ │◄────────────────────────────────┤ │ │ │ │ │ │ With the exception of get_wq_ctx(), the other SMC call wq_resume() can return WQ_SLEEP (these nested rounds of WQ_SLEEP are not shown in the above diagram for the sake of simplicity). Therefore, introduce a new do-while loop to handle multiple WQ_SLEEP return values for the same parent SCM call. Request Completion in the above diagram refers to either a success return value (zero) or error (and not SMC_WAITQ_SLEEP) Also add the interrupt handler that wakes up a sleeping SCM call. Signed-off-by: Guru Das Srinagesh Co-developed-by: Sibi Sankar Signed-off-by: Sibi Sankar --- v5: - Handle the wake_one/wake_all flags [Guru] - Rename flag handler to qcom_scm_waitq_wakeup [Bjorn] - Resume scm call can return ebusy as well handle that scenario by retrying the original smc call and not the resume call v4: - platform_set_drvdata will be used by __scm_smc_do_quirk_handle_waitq to get access to scm struct from device so retain it - Use a single completion as it satisfies all of the current usecases [Bjorn] - Inline scm_get_wq_ctx [Bjorn] - Convert all pr_err to dev_err [Bjorn] - Handle idr_destroy in a thread safe manner [Bjorn] - Misc. Style fixes [Bjorn] v3: - Fixup irq handling so as not to affect SoCs without the interrupt. - Fix warnings reported by kernel test-bot. drivers/firmware/qcom_scm-smc.c | 97 +++++++++++++++++++++++++-- drivers/firmware/qcom_scm.c | 115 +++++++++++++++++++++++++++++++- drivers/firmware/qcom_scm.h | 9 +++ 3 files changed, 213 insertions(+), 8 deletions(-) diff --git a/drivers/firmware/qcom_scm-smc.c b/drivers/firmware/qcom_scm-smc.c index d111833364ba..385615d76e94 100644 --- a/drivers/firmware/qcom_scm-smc.c +++ b/drivers/firmware/qcom_scm-smc.c @@ -52,29 +52,108 @@ static void __scm_smc_do_quirk(const struct arm_smccc_args *smc, } while (res->a0 == QCOM_SCM_INTERRUPTED); } -static void __scm_smc_do(const struct arm_smccc_args *smc, - struct arm_smccc_res *res, bool atomic) +static void fill_wq_resume_args(struct arm_smccc_args *resume, u32 smc_call_ctx) { - int retry_count = 0; + memset(resume->args, 0, sizeof(resume->args[0]) * ARRAY_SIZE(resume->args)); + + resume->args[0] = ARM_SMCCC_CALL_VAL(ARM_SMCCC_STD_CALL, + ARM_SMCCC_SMC_64, ARM_SMCCC_OWNER_SIP, + SCM_SMC_FNID(QCOM_SCM_SVC_WAITQ, QCOM_SCM_WAITQ_RESUME)); + + resume->args[1] = QCOM_SCM_ARGS(1); + + resume->args[2] = smc_call_ctx; +} + +int scm_get_wq_ctx(u32 *wq_ctx, u32 *flags, u32 *more_pending) +{ + int ret; + struct arm_smccc_args get_wq_ctx = {0}; + struct arm_smccc_res get_wq_res; + + get_wq_ctx.args[0] = ARM_SMCCC_CALL_VAL(ARM_SMCCC_STD_CALL, + ARM_SMCCC_SMC_64, ARM_SMCCC_OWNER_SIP, + SCM_SMC_FNID(QCOM_SCM_SVC_WAITQ, QCOM_SCM_WAITQ_GET_WQ_CTX)); + + /* Guaranteed to return only success or error, no WAITQ_* */ + __scm_smc_do_quirk(&get_wq_ctx, &get_wq_res); + ret = get_wq_res.a0; + if (ret) + return ret; + + *wq_ctx = get_wq_res.a1; + *flags = get_wq_res.a2; + *more_pending = get_wq_res.a3; + + return 0; +} + +static int __scm_smc_do_quirk_handle_waitq(struct device *dev, struct arm_smccc_args *waitq, + struct arm_smccc_res *res) +{ + struct qcom_scm *scm; + struct completion *wq = NULL; + struct arm_smccc_args resume; + u32 wq_ctx, smc_call_ctx, flags; + struct arm_smccc_args *smc = waitq; + + do { + __scm_smc_do_quirk(smc, res); + + if (res->a0 == QCOM_SCM_WAITQ_SLEEP) { + wq_ctx = res->a1; + smc_call_ctx = res->a2; + flags = res->a3; + + if (!dev) + return -EPROBE_DEFER; + + scm = dev_get_drvdata(dev); + wq = qcom_scm_lookup_wq(scm, wq_ctx); + if (IS_ERR_OR_NULL(wq)) { + dev_err(dev, "No waitqueue found for wq_ctx %d: %ld\n", + wq_ctx, PTR_ERR(wq)); + return PTR_ERR(wq) ? : -EINVAL; + } + + wait_for_completion(wq); + fill_wq_resume_args(&resume, smc_call_ctx); + smc = &resume; + wq = NULL; + } + } while (res->a0 == QCOM_SCM_WAITQ_SLEEP); + + return 0; +} + +static int __scm_smc_do(struct device *dev, struct arm_smccc_args *smc, + struct arm_smccc_res *res, bool atomic) +{ + int ret, retry_count = 0; if (atomic) { __scm_smc_do_quirk(smc, res); - return; + return 0; } do { mutex_lock(&qcom_scm_lock); - __scm_smc_do_quirk(smc, res); + ret = __scm_smc_do_quirk_handle_waitq(dev, smc, res); mutex_unlock(&qcom_scm_lock); + if (ret) + return ret; + if (res->a0 == QCOM_SCM_V2_EBUSY) { if (retry_count++ > QCOM_SCM_EBUSY_MAX_RETRY) break; msleep(QCOM_SCM_EBUSY_WAIT_MS); } } while (res->a0 == QCOM_SCM_V2_EBUSY); + + return 0; } @@ -83,7 +162,7 @@ int __scm_smc_call(struct device *dev, const struct qcom_scm_desc *desc, struct qcom_scm_res *res, bool atomic) { int arglen = desc->arginfo & 0xf; - int i; + int i, ret; dma_addr_t args_phys = 0; void *args_virt = NULL; size_t alloc_len; @@ -135,13 +214,17 @@ int __scm_smc_call(struct device *dev, const struct qcom_scm_desc *desc, smc.args[SCM_SMC_LAST_REG_IDX] = args_phys; } - __scm_smc_do(&smc, &smc_res, atomic); + /* ret error check follows after args_virt cleanup*/ + ret = __scm_smc_do(dev, &smc, &smc_res, atomic); if (args_virt) { dma_unmap_single(dev, args_phys, alloc_len, DMA_TO_DEVICE); kfree(args_virt); } + if (ret) + return ret; + if (res) { res->result[0] = smc_res.a1; res->result[1] = smc_res.a2; diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c index cdbfe54c8146..396080138eaa 100644 --- a/drivers/firmware/qcom_scm.c +++ b/drivers/firmware/qcom_scm.c @@ -3,7 +3,9 @@ * Copyright (C) 2015 Linaro Ltd. */ #include +#include #include +#include #include #include #include @@ -13,9 +15,12 @@ #include #include #include +#include #include #include #include +#include +#include #include #include "qcom_scm.h" @@ -27,12 +32,20 @@ module_param(download_mode, bool, 0); #define SCM_HAS_IFACE_CLK BIT(1) #define SCM_HAS_BUS_CLK BIT(2) +struct qcom_scm_waitq { + struct idr idr; + /* control access to IDR */ + spinlock_t idr_lock; + struct completion waitq_comp; +}; + struct qcom_scm { struct device *dev; struct clk *core_clk; struct clk *iface_clk; struct clk *bus_clk; struct icc_path *path; + struct qcom_scm_waitq waitq; struct reset_controller_dev reset; /* control access to the interconnect path */ @@ -63,6 +76,9 @@ static const u8 qcom_scm_cpu_warm_bits[QCOM_SCM_BOOT_MAX_CPUS] = { BIT(2), BIT(1), BIT(4), BIT(6) }; +#define QCOM_SMC_WAITQ_FLAG_WAKE_ONE BIT(0) +#define QCOM_SMC_WAITQ_FLAG_WAKE_ALL BIT(1) + static const char * const qcom_scm_convention_names[] = { [SMC_CONVENTION_UNKNOWN] = "unknown", [SMC_CONVENTION_ARM_32] = "smc arm 32", @@ -1325,11 +1341,82 @@ bool qcom_scm_is_available(void) } EXPORT_SYMBOL(qcom_scm_is_available); +struct completion *qcom_scm_lookup_wq(struct qcom_scm *scm, u32 wq_ctx) +{ + int err; + unsigned long flags; + u32 wq_ctx_idr = wq_ctx; + struct completion *wq = NULL; + + spin_lock_irqsave(&scm->waitq.idr_lock, flags); + wq = idr_find(&scm->waitq.idr, wq_ctx); + if (wq) + goto out; + + wq = &scm->waitq.waitq_comp; + + err = idr_alloc_u32(&scm->waitq.idr, wq, &wq_ctx_idr, + U32_MAX, GFP_ATOMIC); + if (err < 0) + wq = ERR_PTR(err); + +out: + spin_unlock_irqrestore(&scm->waitq.idr_lock, flags); + return wq; +} + +static int qcom_scm_waitq_wakeup(struct qcom_scm *scm, unsigned int wq_ctx, bool wake_all) +{ + struct completion *wq_to_wake; + + wq_to_wake = qcom_scm_lookup_wq(scm, wq_ctx); + if (IS_ERR_OR_NULL(wq_to_wake)) { + dev_err(scm->dev, "No waitqueue found for wq_ctx %d: %ld\n", + wq_ctx, PTR_ERR(wq_to_wake)); + return PTR_ERR(wq_to_wake) ? : -EINVAL; + } + + if (wake_all) + complete_all(wq_to_wake); + else + complete(wq_to_wake); + + return 0; +} + +static irqreturn_t qcom_scm_irq_handler(int irq, void *data) +{ + int ret; + struct qcom_scm *scm = data; + u32 wq_ctx, flags, more_pending = 0; + + do { + ret = scm_get_wq_ctx(&wq_ctx, &flags, &more_pending); + if (ret) { + dev_err(scm->dev, "GET_WQ_CTX SMC call failed: %d\n", ret); + goto out; + } + + if (flags != QCOM_SMC_WAITQ_FLAG_WAKE_ONE && + flags != QCOM_SMC_WAITQ_FLAG_WAKE_ALL) { + dev_err(scm->dev, "Invalid flags found for wq_ctx: %u\n", flags); + goto out; + } + + ret = qcom_scm_waitq_wakeup(scm, wq_ctx, !!(flags & QCOM_SMC_WAITQ_FLAG_WAKE_ALL)); + if (ret) + goto out; + } while (more_pending); + +out: + return IRQ_HANDLED; +} + static int qcom_scm_probe(struct platform_device *pdev) { struct qcom_scm *scm; unsigned long clks; - int ret; + int irq, ret; scm = devm_kzalloc(&pdev->dev, sizeof(*scm), GFP_KERNEL); if (!scm) @@ -1399,9 +1486,29 @@ static int qcom_scm_probe(struct platform_device *pdev) if (ret) return ret; + platform_set_drvdata(pdev, scm); + __scm = scm; __scm->dev = &pdev->dev; + spin_lock_init(&__scm->waitq.idr_lock); + idr_init(&__scm->waitq.idr); + init_completion(&__scm->waitq.waitq_comp); + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + if (irq != -ENXIO) + return irq; + } else { + ret = devm_request_threaded_irq(__scm->dev, irq, NULL, qcom_scm_irq_handler, + IRQF_ONESHOT, "qcom-scm", __scm); + if (ret < 0) { + dev_err(scm->dev, "Failed to request qcom-scm irq: %d\n", ret); + idr_destroy(&__scm->waitq.idr); + return ret; + } + } + __get_convention(); /* @@ -1417,6 +1524,12 @@ static int qcom_scm_probe(struct platform_device *pdev) static void qcom_scm_shutdown(struct platform_device *pdev) { + unsigned long flags; + + spin_lock_irqsave(&__scm->waitq.idr_lock, flags); + idr_destroy(&__scm->waitq.idr); + spin_unlock_irqrestore(&__scm->waitq.idr_lock, flags); + /* Clean shutdown, disable download mode to allow normal restart */ if (download_mode) qcom_scm_set_download_mode(false); diff --git a/drivers/firmware/qcom_scm.h b/drivers/firmware/qcom_scm.h index db3d08a01209..323cb49d4976 100644 --- a/drivers/firmware/qcom_scm.h +++ b/drivers/firmware/qcom_scm.h @@ -60,6 +60,10 @@ struct qcom_scm_res { u64 result[MAX_QCOM_SCM_RETS]; }; +struct qcom_scm; +extern struct completion *qcom_scm_lookup_wq(struct qcom_scm *scm, u32 wq_ctx); +extern int scm_get_wq_ctx(u32 *wq_ctx, u32 *flags, u32 *more_pending); + #define SCM_SMC_FNID(s, c) ((((s) & 0xFF) << 8) | ((c) & 0xFF)) extern int __scm_smc_call(struct device *dev, const struct qcom_scm_desc *desc, enum qcom_scm_convention qcom_convention, @@ -129,6 +133,10 @@ extern int scm_legacy_call(struct device *dev, const struct qcom_scm_desc *desc, #define QCOM_SCM_SMMU_CONFIG_ERRATA1 0x03 #define QCOM_SCM_SMMU_CONFIG_ERRATA1_CLIENT_ALL 0x02 +#define QCOM_SCM_SVC_WAITQ 0x24 +#define QCOM_SCM_WAITQ_RESUME 0x02 +#define QCOM_SCM_WAITQ_GET_WQ_CTX 0x03 + /* common error codes */ #define QCOM_SCM_V2_EBUSY -12 #define QCOM_SCM_ENOMEM -5 @@ -137,6 +145,7 @@ extern int scm_legacy_call(struct device *dev, const struct qcom_scm_desc *desc, #define QCOM_SCM_EINVAL_ARG -2 #define QCOM_SCM_ERROR -1 #define QCOM_SCM_INTERRUPTED 1 +#define QCOM_SCM_WAITQ_SLEEP 2 static inline int qcom_scm_remap_error(int err) {