From patchwork Wed Jan 4 01:15:23 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rob Barnes X-Patchwork-Id: 13088131 Received: from mail-pj1-f74.google.com (mail-pj1-f74.google.com [209.85.216.74]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4AF6B7F for ; Wed, 4 Jan 2023 01:15:29 +0000 (UTC) Received: by mail-pj1-f74.google.com with SMTP id o36-20020a17090a0a2700b00226b4e9895aso99651pjo.8 for ; Tue, 03 Jan 2023 17:15:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=mtD8husdIdX8frEf87nd1VCmyju2z3AAnwArL0f2tyQ=; b=Q7S++mu/KIn18rahpCG9MwKvaZ9uHew8s0cbLbJbebMmMd9u9iEwBVWMh9l5vquXUg q0ttNr9bvEJEXMhsqmtkrwa+z5iymltBuj6AK/T40tt4kZmAh3FRgcq11HtXJ1u5shN1 V1xlrJAHdDjnP303txqESGoiwuXpklvksk9UIIcM6ZRRW6sOWyAmFs2T1dhR7+Sk5YcH VzKmX36TtSXCbOnhEvbObgXsmDlpu6teqHVNTbF8tMKcoEMGx+DWuh5xvrQAvWXg0Kr/ 2OQGkDDO0nR6F2beZU32KKPuvEPaU0lpshckOUNnlOw/X1A7bUI1Sg54Xst0JGIwHumI 53xw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=mtD8husdIdX8frEf87nd1VCmyju2z3AAnwArL0f2tyQ=; b=Bv7S4gL8wsrRtzk7ctpiPZGJXnOemetbTR2D6oWVT2bt42/344u73kqoP1Qb+Va5tX 22eG68D/UcwGPUmH2MGDwAMg83qNI3mxQS6OIai5jcSVb0/Jk3qqCPu69V9TyoOUnSLi kvxrWNi6ZzZ3AixhJB9eXaaZu3AYuGsFQIRomNHV2TiWvY9kQnclJYwBABUKPlxI2krp hu4YR16nIpCBPK/AL0O0Grw6YR01kEfbaLMAGxF+hs6p1gQPVaXg1rI3qgzWK+Mluw95 +2O1F9BUHLrtO4HcN1MXF4L3Mww72wPZOwqFqn0W6UgSL93MP8fJqgew/8Iv3kje0+Tu AU+w== X-Gm-Message-State: AFqh2kof4ny3tNTDqMse7Jh/Z2cThV2DRlvaBQyncXX+90AQXuhig603 JQRx+gVXPgyAXoYvbHx6by/XyhQNg0anJ+U= X-Google-Smtp-Source: AMrXdXuwLpGlApYoxwzl8NZqS+fhRZdhxTeBTrJkIe/NFknBjsLe50Lyfk6qQwpyi4OT4ignAqtCIQqdWqAZ+co= X-Received: from robbarnes3.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:6451]) (user=robbarnes job=sendgmr) by 2002:a17:90a:e586:b0:221:684a:d076 with SMTP id g6-20020a17090ae58600b00221684ad076mr4131093pjz.4.1672794928809; Tue, 03 Jan 2023 17:15:28 -0800 (PST) Date: Wed, 4 Jan 2023 01:15:23 +0000 In-Reply-To: <20230104011524.369764-1-robbarnes@google.com> Precedence: bulk X-Mailing-List: chrome-platform@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20230104011524.369764-1-robbarnes@google.com> X-Mailer: git-send-email 2.39.0.314.g84b9a713c41-goog Message-ID: <20230104011524.369764-2-robbarnes@google.com> Subject: [PATCH v3 1/2] platform/chrome: cros_ec: Poll EC log on EC panic From: Rob Barnes To: groeck@chromium.org, pmalani@chromium.org Cc: chrome-platform@lists.linux.dev, linux-kernel@vger.kernel.org, dtor@chromium.org, Rob Barnes Add handler for CrOS EC panic events. When a panic is reported, immediately poll for EC log. This should result in the log leading to the EC panic being preserved. ACPI_NOTIFY_CROS_EC_PANIC is defined in coreboot at https://review.coreboot.org/plugins/gitiles/coreboot/+/refs/heads/master/src/ec/google/chromeec/acpi/ec.asl Signed-off-by: Rob Barnes Reviewed-by: Prashant Malani --- Changelog since v1: - Split into two patches - Moved panic handle before mkbp loop - Switched to dev_emerg message drivers/platform/chrome/cros_ec_debugfs.c | 23 +++++++++++++++++++++ drivers/platform/chrome/cros_ec_lpc.c | 7 +++++++ include/linux/platform_data/cros_ec_proto.h | 9 ++++++++ 3 files changed, 39 insertions(+) diff --git a/drivers/platform/chrome/cros_ec_debugfs.c b/drivers/platform/chrome/cros_ec_debugfs.c index 21d973fc6be2..34f7b46f8761 100644 --- a/drivers/platform/chrome/cros_ec_debugfs.c +++ b/drivers/platform/chrome/cros_ec_debugfs.c @@ -49,6 +49,7 @@ struct cros_ec_debugfs { struct delayed_work log_poll_work; /* EC panicinfo */ struct debugfs_blob_wrapper panicinfo_blob; + struct notifier_block notifier_panic; }; /* @@ -437,6 +438,22 @@ static int cros_ec_create_panicinfo(struct cros_ec_debugfs *debug_info) return ret; } +static int cros_ec_debugfs_panic_event(struct notifier_block *nb, + unsigned long queued_during_suspend, void *_notify) +{ + struct cros_ec_debugfs *debug_info = + container_of(nb, struct cros_ec_debugfs, notifier_panic); + + if (debug_info->log_buffer.buf) { + /* Force log poll work to run immediately */ + mod_delayed_work(debug_info->log_poll_work.wq, &debug_info->log_poll_work, 0); + /* Block until log poll work finishes */ + flush_delayed_work(&debug_info->log_poll_work); + } + + return NOTIFY_DONE; +} + static int cros_ec_debugfs_probe(struct platform_device *pd) { struct cros_ec_dev *ec = dev_get_drvdata(pd->dev.parent); @@ -473,6 +490,12 @@ static int cros_ec_debugfs_probe(struct platform_device *pd) debugfs_create_u16("suspend_timeout_ms", 0664, debug_info->dir, &ec->ec_dev->suspend_timeout_ms); + debug_info->notifier_panic.notifier_call = cros_ec_debugfs_panic_event; + ret = blocking_notifier_chain_register(&ec->ec_dev->panic_notifier, + &debug_info->notifier_panic); + if (ret) + goto remove_debugfs; + ec->debug_info = debug_info; dev_set_drvdata(&pd->dev, ec); diff --git a/drivers/platform/chrome/cros_ec_lpc.c b/drivers/platform/chrome/cros_ec_lpc.c index 7fc8f82280ac..5738f1d25091 100644 --- a/drivers/platform/chrome/cros_ec_lpc.c +++ b/drivers/platform/chrome/cros_ec_lpc.c @@ -320,6 +320,13 @@ static void cros_ec_lpc_acpi_notify(acpi_handle device, u32 value, void *data) ec_dev->last_event_time = cros_ec_get_time_ns(); + if (value == ACPI_NOTIFY_CROS_EC_PANIC) { + dev_emerg(ec_dev->dev, "CrOS EC Panic Reported. Shutdown is imminent!"); + blocking_notifier_call_chain(&ec_dev->panic_notifier, 0, ec_dev); + /* Do not query for other events after a panic is reported */ + return; + } + if (ec_dev->mkbp_event_supported) do { ret = cros_ec_get_next_event(ec_dev, NULL, diff --git a/include/linux/platform_data/cros_ec_proto.h b/include/linux/platform_data/cros_ec_proto.h index e43107e0bee1..7fb2196f99b0 100644 --- a/include/linux/platform_data/cros_ec_proto.h +++ b/include/linux/platform_data/cros_ec_proto.h @@ -41,6 +41,13 @@ #define EC_MAX_REQUEST_OVERHEAD 1 #define EC_MAX_RESPONSE_OVERHEAD 32 +/* + * EC panic is not covered by the standard (0-F) ACPI notify values. + * Arbitrarily choosing B0 to notify ec panic, which is in the 84-BF + * device specific ACPI notify range. + */ +#define ACPI_NOTIFY_CROS_EC_PANIC 0xB0 + /* * Command interface between EC and AP, for LPC, I2C and SPI interfaces. */ @@ -176,6 +183,8 @@ struct cros_ec_device { /* The platform devices used by the mfd driver */ struct platform_device *ec; struct platform_device *pd; + + struct blocking_notifier_head panic_notifier; }; /**