Received: by 2002:a25:4158:0:0:0:0:0 with SMTP id o85csp5341289yba; Wed, 10 Apr 2019 17:32:22 -0700 (PDT) X-Google-Smtp-Source: APXvYqyYyfqDrSiXnPQXdcJsR3sZIswRItlMQT479koOdJUyUq+s00aQpYP2bsENkkGE2juAXeG7 X-Received: by 2002:a63:1a1b:: with SMTP id a27mr43398077pga.59.1554942742226; Wed, 10 Apr 2019 17:32:22 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1554942742; cv=none; d=google.com; s=arc-20160816; b=08MEmacCH0h0oJnz6AUrnPx9vE43HRe1gbfcRawmafKw/2R2rHvolpIQMGv0+lzQvr O2TJJ9IZiFtRhBbGJbuHkS5IBmWINwwkf2XTpB4RRwm5lqxU2tYSPVTbpze+cmxVwpWR 4Aqs0+xoR5DOt+2/+0BR/+FFVNhPcNrm6V7rHUeBnkQcd3C0sX6hS5UCWMgcQ+kmUuZZ JTe3B73zWEOZruEJUhRHfGCCNP3cy2PySVyFqXd2PBw5BQik/vpfZ/d9kyliK0q82uH4 kncyamb6qAjYJ9BTT2FsaMG+2tikTk2++FqL3PR6bL8oygWkLYihEjjRZZ/2mkq0OA5M 3E6w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:cc:to:from:subject:references :mime-version:message-id:in-reply-to:date:dkim-signature; bh=tsOWk2cVWqbBlMNxvPpaOSii7DDKlJ5eds47veVZ5KM=; b=i2eePtkP0J/BGlqeGKVudRCSNfb1MeLi23b4MjMXtE9JXcufBNR/myTGVsTRrfJ7F7 kph5VgQIiWgJWvViC4Ijak8cy/ODf1UsP4EIg2AUy7hbqLP/hXNceERKtYaJ2yjRtNOZ Vnj9ELDachrtrrWV1rjoqLt6WzrRkPirJlzsgTL94ueiEjqV23wNJHIiDSR3+TmgBd7l Rqpl0poFkC91WCyJ5HASSMgz24cJgJyuM8AaTE8Xk/mOzJkA3iacgdndGiS0xIfWJor2 3sdMN8uaAvPNSWitycL1hmjGZijqeum6wWVX/+tKWbaydkU+hiOuXQfYBOeZI5+IYxYy smng== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@google.com header.s=20161025 header.b=Gc1AGrfH; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id r39si34518825pld.10.2019.04.10.17.32.06; Wed, 10 Apr 2019 17:32:22 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20161025 header.b=Gc1AGrfH; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726831AbfDKAb2 (ORCPT + 99 others); Wed, 10 Apr 2019 20:31:28 -0400 Received: from mail-oi1-f201.google.com ([209.85.167.201]:55932 "EHLO mail-oi1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726096AbfDKAb1 (ORCPT ); Wed, 10 Apr 2019 20:31:27 -0400 Received: by mail-oi1-f201.google.com with SMTP id l6so2016258oii.22 for ; Wed, 10 Apr 2019 17:31:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=tsOWk2cVWqbBlMNxvPpaOSii7DDKlJ5eds47veVZ5KM=; b=Gc1AGrfHtVEdt/uHs01OPStQPQCYN6qaHN1oY/cjLV2bKFFqZQf4e1t7977JwYfRSM rFdmT2qevcipgUzD0EXxYNOhT5Qcpm5D6qS/YYMxe4FFzwsxa42Vbm1oTgMNw43qTt72 a809VWZJ3wS5mN5p69tH9w4cetJ40amBjI8N2HBK4OEzWLhp+LPsCK60uWlgo1NkmsHi cXF376uoGHbkvoGDJOQ97GMkmyueVks6nQLRYJr+Bfi3Ed0LbREaMgiQL8VbGPl7a0AG h2JpKVXfD+NxYHd1GXpBYSptR5QuZQSJDurdpRoXLWqeAvrI0YCAhSwNKdOdYKtQdQ9a 370A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=tsOWk2cVWqbBlMNxvPpaOSii7DDKlJ5eds47veVZ5KM=; b=attoTH0x4MRd+dG7tHG97BnryBU+dt7gHNTQHfzkuEdMk1XaAGQ074MNNc0mSsDUd+ 3LN5eNwLrfe9+Yelj9Iz6nBADfrHLqHrNcQhEBM+WmypA688hAXoPqtrlgRwcQop7Yyt DQyihGZjJio4waf2OZ1VUh/KLNzDT7b9j++SeLGvSFvkMn5PF3UqyjpAn2Ek0RdSqtw4 IoKHy5orxNO9QJgJ1xFSt+AsQQPzujI8u71xNjMv1AYMO4bXpggWoi3iytpxmCF4Rbdu 3+IfvO5zq6bQcwxE5SUinrxy2Hyvkb/MdU8WLDx3TaVt5wq0Wy220tDIuNXVgjYgNuY/ 2TVQ== X-Gm-Message-State: APjAAAVxLx+2wBdACSQUPjlOd695Wo0DrNGPwTgvVuyohmyRoULiL9Rv re3TptDCqHwYky6Prfm1XhkDgKUSyWma X-Received: by 2002:aca:abd7:: with SMTP id u206mr3966902oie.36.1554942686486; Wed, 10 Apr 2019 17:31:26 -0700 (PDT) Date: Wed, 10 Apr 2019 17:31:06 -0700 In-Reply-To: <20190411003107.52044-1-rajatja@google.com> Message-Id: <20190411003107.52044-2-rajatja@google.com> Mime-Version: 1.0 References: <20190313222124.229371-1-rajatja@google.com> <20190411003107.52044-1-rajatja@google.com> X-Mailer: git-send-email 2.21.0.392.gf8f6787159e-goog Subject: [PATCH v4 2/3] platform/x86: intel_pmc_core: Allow to dump debug registers on S0ix failure From: Rajat Jain To: Rajneesh Bhardwaj , Vishwanath Somayaji , Darren Hart , Andy Shevchenko , platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org, Rafael J , Srinivas Pandruvada Cc: Rajat Jain , furquan@google.com, evgreen@google.com, rajatxjain@gmail.com Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add a module parameter which when enabled, will check on resume, if the last S0ix attempt was successful. If not, the driver would warn and provide helpful debug information (which gets latched during the failed suspend attempt) to debug the S0ix failure. This information is very useful to debug S0ix failures. Specially since the latched debug information will be lost (over-written) if the system attempts to go into runtime (or imminent) S0ix again after that failed suspend attempt. Signed-off-by: Rajat Jain --- v4: Use 1 condition per if statement, rename some functions. v3: No changes v2: Use pm_suspend_via_firmware() to enable the check only for S0ix drivers/platform/x86/intel_pmc_core.c | 93 +++++++++++++++++++++++++++ drivers/platform/x86/intel_pmc_core.h | 7 ++ 2 files changed, 100 insertions(+) diff --git a/drivers/platform/x86/intel_pmc_core.c b/drivers/platform/x86/intel_pmc_core.c index 8da886e17681..b1f099de5cb3 100644 --- a/drivers/platform/x86/intel_pmc_core.c +++ b/drivers/platform/x86/intel_pmc_core.c @@ -20,6 +20,7 @@ #include #include #include +#include #include #include @@ -920,6 +921,97 @@ static int pmc_core_remove(struct platform_device *pdev) return 0; } +#ifdef CONFIG_PM_SLEEP + +static bool warn_on_s0ix_failures; +module_param(warn_on_s0ix_failures, bool, 0644); +MODULE_PARM_DESC(warn_on_s0ix_failures, "Check and warn for S0ix failures"); + +static int pmc_core_suspend(struct device *dev) +{ + struct pmc_dev *pmcdev = dev_get_drvdata(dev); + + pmcdev->check_counters = false; + + /* No warnings on S0ix failures */ + if (!warn_on_s0ix_failures) + return 0; + + /* Check if the syspend will actually use S0ix */ + if (pm_suspend_via_firmware()) + return 0; + + /* Save PC10 and S0ix residency for checking later */ + if (!rdmsrl_safe(MSR_PKG_C10_RESIDENCY, &pmcdev->pc10_counter) && + !pmc_core_dev_state_get(pmcdev, &pmcdev->s0ix_counter)) + pmcdev->check_counters = true; + + return 0; +} + +static inline bool pmc_core_is_pc10_failed(struct pmc_dev *pmcdev) +{ + u64 pc10_counter; + + if (!rdmsrl_safe(MSR_PKG_C10_RESIDENCY, &pc10_counter) && + pc10_counter == pmcdev->pc10_counter) + return true; + + return false; +} + +static inline bool pmc_core_is_s0ix_failed(struct pmc_dev *pmcdev) +{ + u64 s0ix_counter; + + if (!pmc_core_dev_state_get(pmcdev, &s0ix_counter) && + s0ix_counter == pmcdev->s0ix_counter) + return true; + + return false; +} + +static int pmc_core_resume(struct device *dev) +{ + struct pmc_dev *pmcdev = dev_get_drvdata(dev); + + if (!pmcdev->check_counters) + return 0; + + if (pmc_core_is_pc10_failed(pmcdev)) { + dev_info(dev, "PC10 entry had failed (PC10 cnt=0x%llx)\n", + pmcdev->pc10_counter); + } else if (pmc_core_is_s0ix_failed(pmcdev)) { + + const struct pmc_bit_map **maps = pmcdev->map->slps0_dbg_maps; + const struct pmc_bit_map *map; + int offset = pmcdev->map->slps0_dbg_offset; + u32 data; + + dev_warn(dev, "S0ix entry had failed (S0ix cnt=%llu)\n", + pmcdev->s0ix_counter); + while (*maps) { + map = *maps; + data = pmc_core_reg_read(pmcdev, offset); + offset += 4; + while (map->name) { + dev_warn(dev, "SLP_S0_DBG: %-32s\tState: %s\n", + map->name, + data & map->bit_mask ? "Yes" : "No"); + ++map; + } + ++maps; + } + } + return 0; +} + +#endif + +static const struct dev_pm_ops pmc_core_pm_ops = { + SET_LATE_SYSTEM_SLEEP_PM_OPS(pmc_core_suspend, pmc_core_resume) +}; + static const struct acpi_device_id pmc_core_acpi_ids[] = { {"INT33A1", 0}, /* _HID for Intel Power Engine, _CID PNP0D80*/ { } @@ -930,6 +1022,7 @@ static struct platform_driver pmc_core_driver = { .driver = { .name = "pmc_core", .acpi_match_table = ACPI_PTR(pmc_core_acpi_ids), + .pm = &pmc_core_pm_ops, }, .probe = pmc_core_probe, .remove = pmc_core_remove, diff --git a/drivers/platform/x86/intel_pmc_core.h b/drivers/platform/x86/intel_pmc_core.h index 88d9c0653a5f..fdee5772e532 100644 --- a/drivers/platform/x86/intel_pmc_core.h +++ b/drivers/platform/x86/intel_pmc_core.h @@ -241,6 +241,9 @@ struct pmc_reg_map { * @pmc_xram_read_bit: flag to indicate whether PMC XRAM shadow registers * used to read MPHY PG and PLL status are available * @mutex_lock: mutex to complete one transcation + * @check_counters: On resume, check if counters are getting incremented + * @pc10_counter: PC10 residency counter + * @s0ix_counter: S0ix residency (step adjusted) * * pmc_dev contains info about power management controller device. */ @@ -253,6 +256,10 @@ struct pmc_dev { #endif /* CONFIG_DEBUG_FS */ int pmc_xram_read_bit; struct mutex lock; /* generic mutex lock for PMC Core */ + + bool check_counters; /* Check for counter increments on resume */ + u64 pc10_counter; + u64 s0ix_counter; }; #endif /* PMC_CORE_H */ -- 2.21.0.392.gf8f6787159e-goog