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[103.229.16.4]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3341be383b4sm15846936a91.27.2025.09.28.23.27.27 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 28 Sep 2025 23:27:31 -0700 (PDT) Message-ID: <20ac1a08-1c44-49e6-beae-6bf7bb36ee4b@oss.qualcomm.com> Date: Mon, 29 Sep 2025 14:27:24 +0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 5/6] remoteproc: qcom: pas: Add late attach support for subsystems To: Zhongqiu Han , Bjorn Andersson , Mathieu Poirier , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Manivannan Sadhasivam , Konrad Dybcio Cc: linux-arm-msm@vger.kernel.org, linux-remoteproc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, aiqun.yu@oss.qualcomm.com, tingwei.zhang@oss.qualcomm.com, trilok.soni@oss.qualcomm.com, yijie.yang@oss.qualcomm.com, Gokul krishna Krishnakumar References: <20250924-knp-remoteproc-v1-0-611bf7be8329@oss.qualcomm.com> <20250924-knp-remoteproc-v1-5-611bf7be8329@oss.qualcomm.com> Content-Language: en-US From: Jingyi Wang In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Proofpoint-GUID: FORj4IWs4CL4214aWsMvRWhc-6rB_LhT X-Authority-Analysis: v=2.4 cv=O4g0fR9W c=1 sm=1 tr=0 ts=68da26d5 cx=c_pps a=0uOsjrqzRL749jD1oC5vDA==:117 a=nuhDOHQX5FNHPW3J6Bj6AA==:17 a=IkcTkHD0fZMA:10 a=yJojWOMRYYMA:10 a=EUspDBNiAAAA:8 a=HOk5XYdhHCy6_sCauzoA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=mQ_c8vxmzFEMiUWkPHU9:22 X-Proofpoint-ORIG-GUID: FORj4IWs4CL4214aWsMvRWhc-6rB_LhT X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwOTI3MDAwMSBTYWx0ZWRfX5wHK8wcJ3cCB BDv3p+RmhzFPDLdNUU5dleHLxYLTGaXwyZUTmmCyDKo5uNDS5L0qE5HCQuJiVP6S7k1OP3KAgAX R7iERB8GonUXPCGM0Z3F6wGMqECVVhAYwThWwyN6FhCIbgL6GLvmC7fMTpbWfhTOdmX2NUBF54d RycZhUtYE2RoiQtNYXftjEhrisxgbT4Zy04T9ljAYnGRDYqIusZnSyytRtqFS6fE2wDMSKLcA5l Pn3ZSIekot24mOPxxuNkYd1cq875ZI4KscEiA16jlVApwpMRj9VFBANOuO9vm5RxMKK91sdUxEH LMGmq32VV/P9nFasX1hu7GLzKOxOBFQRV6ZPH4eES8xj3/eJtUHjOU7uLK152QmXaR+up90KLsq 4ECW7f/WeNth/tqn42JXvupEW3oK9A== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1117,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-09-29_02,2025-09-29_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 phishscore=0 clxscore=1015 priorityscore=1501 lowpriorityscore=0 spamscore=0 impostorscore=0 bulkscore=0 suspectscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2509150000 definitions=main-2509270001 On 9/25/2025 1:56 PM, Zhongqiu Han wrote: > On 9/25/2025 7:37 AM, Jingyi Wang wrote: >> From: Gokul krishna Krishnakumar >> >> Subsystems can be brought out of reset by entities such as >> bootloaders. Before attaching such subsystems, it is important to >> check the state of the subsystem. This patch adds support to attach >> to a subsystem by ensuring that the subsystem is in a sane state by >> reading SMP2P bits and pinging the subsystem. >> >> Signed-off-by: Gokul krishna Krishnakumar >> Co-developed-by: Jingyi Wang >> Signed-off-by: Jingyi Wang >> --- >>   drivers/remoteproc/qcom_q6v5.c      | 89 ++++++++++++++++++++++++++++++++++++- >>   drivers/remoteproc/qcom_q6v5.h      | 14 +++++- >>   drivers/remoteproc/qcom_q6v5_adsp.c |  2 +- >>   drivers/remoteproc/qcom_q6v5_mss.c  |  2 +- >>   drivers/remoteproc/qcom_q6v5_pas.c  | 61 ++++++++++++++++++++++++- >>   5 files changed, 163 insertions(+), 5 deletions(-) >> >> diff --git a/drivers/remoteproc/qcom_q6v5.c b/drivers/remoteproc/qcom_q6v5.c >> index 4ee5e67a9f03..cba05e1d6d52 100644 >> --- a/drivers/remoteproc/qcom_q6v5.c >> +++ b/drivers/remoteproc/qcom_q6v5.c >> @@ -94,6 +94,9 @@ static irqreturn_t q6v5_wdog_interrupt(int irq, void *data) >>       size_t len; >>       char *msg; >>   +    if (q6v5->early_boot) >> +        complete(&q6v5->subsys_booted); >> + >>       /* Sometimes the stop triggers a watchdog rather than a stop-ack */ >>       if (!q6v5->running) { >>           complete(&q6v5->stop_done); >> @@ -118,6 +121,9 @@ static irqreturn_t q6v5_fatal_interrupt(int irq, void *data) >>       size_t len; >>       char *msg; >>   +    if (q6v5->early_boot) >> +        complete(&q6v5->subsys_booted); >> + >>       if (!q6v5->running) >>           return IRQ_HANDLED; >>   @@ -139,6 +145,9 @@ static irqreturn_t q6v5_ready_interrupt(int irq, void *data) >>         complete(&q6v5->start_done); >>   +    if (q6v5->early_boot) >> +        complete(&q6v5->subsys_booted); >> + >>       return IRQ_HANDLED; >>   } >>   @@ -170,6 +179,9 @@ static irqreturn_t q6v5_handover_interrupt(int irq, void *data) >>       if (q6v5->handover) >>           q6v5->handover(q6v5); >>   +    if (q6v5->early_boot) >> +        complete(&q6v5->subsys_booted); >> + >>       icc_set_bw(q6v5->path, 0, 0); >>         q6v5->handover_issued = true; >> @@ -232,6 +244,77 @@ unsigned long qcom_q6v5_panic(struct qcom_q6v5 *q6v5) >>   } >>   EXPORT_SYMBOL_GPL(qcom_q6v5_panic); >>   +static irqreturn_t q6v5_pong_interrupt(int irq, void *data) >> +{ >> +    struct qcom_q6v5 *q6v5 = data; >> + >> +    complete(&q6v5->ping_done); >> + >> +    return IRQ_HANDLED; >> +} >> + >> +int qcom_q6v5_ping_subsystem(struct qcom_q6v5 *q6v5) >> +{ >> +    int ret; >> +    int ping_failed = 0; >> + >> +    reinit_completion(&q6v5->ping_done); >> + >> +    /* Set master kernel Ping bit */ >> +    ret = qcom_smem_state_update_bits(q6v5->ping_state, >> +                      BIT(q6v5->ping_bit), BIT(q6v5->ping_bit)); >> +    if (ret) { >> +        dev_err(q6v5->dev, "Failed to update ping bits\n"); >> +        return ret; >> +    } >> + >> +    ret = wait_for_completion_timeout(&q6v5->ping_done, msecs_to_jiffies(PING_TIMEOUT)); >> +    if (!ret) { >> +        ping_failed = -ETIMEDOUT; >> +        dev_err(q6v5->dev, "Failed to get back pong\n"); >> +    } >> + >> +    /* Clear ping bit master kernel */ >> +    ret = qcom_smem_state_update_bits(q6v5->ping_state, BIT(q6v5->ping_bit), 0); >> +    if (ret) { >> +        pr_err("Failed to clear master kernel bits\n"); >> +        return ret; >> +    } >> + >> +    if (ping_failed) >> +        return ping_failed; >> + >> +    return 0; >> +} >> +EXPORT_SYMBOL_GPL(qcom_q6v5_ping_subsystem); >> + >> +int qcom_q6v5_ping_subsystem_init(struct qcom_q6v5 *q6v5, struct platform_device *pdev) >> +{ >> +    int ret = -ENODEV; >> + >> +    q6v5->ping_state = devm_qcom_smem_state_get(&pdev->dev, "ping", &q6v5->ping_bit); >> +    if (IS_ERR(q6v5->ping_state)) { >> +        dev_err(&pdev->dev, "failed to acquire smem state %ld\n", >> +            PTR_ERR(q6v5->ping_state)); >> +        return ret; >> +    } >> + >> +    q6v5->pong_irq = platform_get_irq_byname(pdev, "pong"); >> +    if (q6v5->pong_irq < 0) >> +        return q6v5->pong_irq; >> + >> +    ret = devm_request_threaded_irq(&pdev->dev, q6v5->pong_irq, NULL, >> +                    q6v5_pong_interrupt, IRQF_TRIGGER_RISING | IRQF_ONESHOT, >> +                    "q6v5 pong", q6v5); >> +    if (ret) >> +        dev_err(&pdev->dev, "failed to acquire pong IRQ\n"); >> + >> +    init_completion(&q6v5->ping_done); > > Hello Jingyi, > > Since no IRQF_NO_AUTOEN flag is passed to devm_request_threaded_irq(), > the IRQ may be enabled immediately after registration. > If the thread_fn q6v5_pong_interrupt runs before > init_completion(&q6v5->ping_done) is called, it may lead to accessing an > uninitialized completion structure ? > > Hi Zhongqiu, q6v5_pong_interrupt will only trigger after we call qcom_q6v5_ping_subsystem, which must be called after this function. Thanks, Jingyi >> + >> +    return ret; >> +} >> +EXPORT_SYMBOL_GPL(qcom_q6v5_ping_subsystem_init); >> + >>   /** >>    * qcom_q6v5_init() - initializer of the q6v5 common struct >>    * @q6v5:    handle to be initialized >> @@ -245,7 +328,7 @@ EXPORT_SYMBOL_GPL(qcom_q6v5_panic); >>    */ >>   int qcom_q6v5_init(struct qcom_q6v5 *q6v5, struct platform_device *pdev, >>              struct rproc *rproc, int crash_reason, const char *load_state, >> -           void (*handover)(struct qcom_q6v5 *q6v5)) >> +           bool early_boot, void (*handover)(struct qcom_q6v5 *q6v5)) >>   { >>       int ret; >>   @@ -253,10 +336,14 @@ int qcom_q6v5_init(struct qcom_q6v5 *q6v5, struct platform_device *pdev, >>       q6v5->dev = &pdev->dev; >>       q6v5->crash_reason = crash_reason; >>       q6v5->handover = handover; >> +    q6v5->early_boot = early_boot; >>         init_completion(&q6v5->start_done); >>       init_completion(&q6v5->stop_done); >>   +    if (early_boot) >> +        init_completion(&q6v5->subsys_booted); >> + >>       q6v5->wdog_irq = platform_get_irq_byname(pdev, "wdog"); >>       if (q6v5->wdog_irq < 0) >>           return q6v5->wdog_irq; >> diff --git a/drivers/remoteproc/qcom_q6v5.h b/drivers/remoteproc/qcom_q6v5.h >> index 5a859c41896e..8a227bf70d7e 100644 >> --- a/drivers/remoteproc/qcom_q6v5.h >> +++ b/drivers/remoteproc/qcom_q6v5.h >> @@ -12,27 +12,35 @@ struct rproc; >>   struct qcom_smem_state; >>   struct qcom_sysmon; >>   +#define PING_TIMEOUT 500 /* in milliseconds */ >> +#define PING_TEST_WAIT 500 /* in milliseconds */ >> + >>   struct qcom_q6v5 { >>       struct device *dev; >>       struct rproc *rproc; >>         struct qcom_smem_state *state; >> +    struct qcom_smem_state *ping_state; >>       struct qmp *qmp; >>         struct icc_path *path; >>         unsigned stop_bit; >> +    unsigned int ping_bit; >>         int wdog_irq; >>       int fatal_irq; >>       int ready_irq; >>       int handover_irq; >>       int stop_irq; >> +    int pong_irq; >>         bool handover_issued; >>         struct completion start_done; >>       struct completion stop_done; >> +    struct completion subsys_booted; >> +    struct completion ping_done; >>         int crash_reason; >>   @@ -40,11 +48,13 @@ struct qcom_q6v5 { >>         const char *load_state; >>       void (*handover)(struct qcom_q6v5 *q6v5); >> + >> +    bool early_boot; >>   }; >>     int qcom_q6v5_init(struct qcom_q6v5 *q6v5, struct platform_device *pdev, >>              struct rproc *rproc, int crash_reason, const char *load_state, >> -           void (*handover)(struct qcom_q6v5 *q6v5)); >> +           bool early_boot, void (*handover)(struct qcom_q6v5 *q6v5)); >>   void qcom_q6v5_deinit(struct qcom_q6v5 *q6v5); >>     int qcom_q6v5_prepare(struct qcom_q6v5 *q6v5); >> @@ -52,5 +62,7 @@ int qcom_q6v5_unprepare(struct qcom_q6v5 *q6v5); >>   int qcom_q6v5_request_stop(struct qcom_q6v5 *q6v5, struct qcom_sysmon *sysmon); >>   int qcom_q6v5_wait_for_start(struct qcom_q6v5 *q6v5, int timeout); >>   unsigned long qcom_q6v5_panic(struct qcom_q6v5 *q6v5); >> +int qcom_q6v5_ping_subsystem(struct qcom_q6v5 *q6v5); >> +int qcom_q6v5_ping_subsystem_init(struct qcom_q6v5 *q6v5, struct platform_device *pdev); >>     #endif >> diff --git a/drivers/remoteproc/qcom_q6v5_adsp.c b/drivers/remoteproc/qcom_q6v5_adsp.c >> index e98b7e03162c..1576b435b921 100644 >> --- a/drivers/remoteproc/qcom_q6v5_adsp.c >> +++ b/drivers/remoteproc/qcom_q6v5_adsp.c >> @@ -717,7 +717,7 @@ static int adsp_probe(struct platform_device *pdev) >>           goto disable_pm; >>         ret = qcom_q6v5_init(&adsp->q6v5, pdev, rproc, desc->crash_reason_smem, >> -                 desc->load_state, qcom_adsp_pil_handover); >> +                 desc->load_state, false, qcom_adsp_pil_handover); >>       if (ret) >>           goto disable_pm; >>   diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c >> index 0c0199fb0e68..04e577541c8f 100644 >> --- a/drivers/remoteproc/qcom_q6v5_mss.c >> +++ b/drivers/remoteproc/qcom_q6v5_mss.c >> @@ -2156,7 +2156,7 @@ static int q6v5_probe(struct platform_device *pdev) >>       qproc->has_mba_logs = desc->has_mba_logs; >>         ret = qcom_q6v5_init(&qproc->q6v5, pdev, rproc, MPSS_CRASH_REASON_SMEM, "modem", >> -                 qcom_msa_handover); >> +                 false, qcom_msa_handover); >>       if (ret) >>           goto detach_proxy_pds; >>   diff --git a/drivers/remoteproc/qcom_q6v5_pas.c b/drivers/remoteproc/qcom_q6v5_pas.c >> index 55a7da801183..99163e48a76a 100644 >> --- a/drivers/remoteproc/qcom_q6v5_pas.c >> +++ b/drivers/remoteproc/qcom_q6v5_pas.c >> @@ -35,6 +35,8 @@ >>     #define MAX_ASSIGN_COUNT 3 >>   +#define EARLY_BOOT_RETRY_INTERVAL_MS 5000 >> + >>   struct qcom_pas_data { >>       int crash_reason_smem; >>       const char *firmware_name; >> @@ -58,6 +60,7 @@ struct qcom_pas_data { >>       int region_assign_count; >>       bool region_assign_shared; >>       int region_assign_vmid; >> +    bool early_boot; >>   }; >>     struct qcom_pas { >> @@ -430,6 +433,51 @@ static unsigned long qcom_pas_panic(struct rproc *rproc) >>       return qcom_q6v5_panic(&pas->q6v5); >>   } >>   +static int qcom_pas_attach(struct rproc *rproc) >> +{ >> +    int ret; >> +    struct qcom_pas *adsp = rproc->priv; >> +    bool ready_state; >> +    bool crash_state; >> + >> +    if (!adsp->q6v5.early_boot) >> +        return -EINVAL; >> + >> +    ret = irq_get_irqchip_state(adsp->q6v5.fatal_irq, >> +                    IRQCHIP_STATE_LINE_LEVEL, &crash_state); >> + >> +    if (crash_state) { >> +        dev_err(adsp->dev, "Sub system has crashed before driver probe\n"); >> +        adsp->rproc->state = RPROC_CRASHED; >> +        return -EINVAL; >> +    } >> + >> +    ret = irq_get_irqchip_state(adsp->q6v5.ready_irq, >> +                    IRQCHIP_STATE_LINE_LEVEL, &ready_state); >> + >> +    if (ready_state) { >> +        dev_info(adsp->dev, "Sub system has boot-up before driver probe\n"); >> +        adsp->rproc->state = RPROC_DETACHED; >> +    } else { >> +        ret = wait_for_completion_timeout(&adsp->q6v5.subsys_booted, >> +                          msecs_to_jiffies(EARLY_BOOT_RETRY_INTERVAL_MS)); >> +        if (!ret) { >> +            dev_err(adsp->dev, "Timeout on waiting for subsystem interrupt\n"); >> +            return -ETIMEDOUT; >> +        } >> +    } >> + >> +    ret = qcom_q6v5_ping_subsystem(&adsp->q6v5); >> +    if (ret) { >> +        dev_err(adsp->dev, "Failed to ping subsystem, assuming device crashed\n"); >> +        rproc->state = RPROC_CRASHED; >> +        return ret; >> +    } >> + >> +    adsp->q6v5.running = true; >> +    return ret; >> +} >> + >>   static const struct rproc_ops qcom_pas_ops = { >>       .unprepare = qcom_pas_unprepare, >>       .start = qcom_pas_start, >> @@ -438,6 +486,7 @@ static const struct rproc_ops qcom_pas_ops = { >>       .parse_fw = qcom_register_dump_segments, >>       .load = qcom_pas_load, >>       .panic = qcom_pas_panic, >> +    .attach = qcom_pas_attach, >>   }; >>     static const struct rproc_ops qcom_pas_minidump_ops = { >> @@ -760,7 +809,7 @@ static int qcom_pas_probe(struct platform_device *pdev) >>       pas->proxy_pd_count = ret; >>         ret = qcom_q6v5_init(&pas->q6v5, pdev, rproc, desc->crash_reason_smem, >> -                 desc->load_state, qcom_pas_handover); >> +                 desc->load_state, desc->early_boot, qcom_pas_handover); >>       if (ret) >>           goto detach_proxy_pds; >>   @@ -774,6 +823,16 @@ static int qcom_pas_probe(struct platform_device *pdev) >>       } >>         qcom_add_ssr_subdev(rproc, &pas->ssr_subdev, desc->ssr_name); >> + >> +    if (pas->q6v5.early_boot) { >> +        ret = qcom_q6v5_ping_subsystem_init(&pas->q6v5, pdev); >> +        if (ret) >> +            dev_err(&pdev->dev, >> +                "Unable to find ping/pong bits, falling back to firmware load\n"); >> +        else >> +            pas->rproc->state = RPROC_DETACHED; >> +    } >> + >>       ret = rproc_add(rproc); >>       if (ret) >>           goto remove_ssr_sysmon; >> > >