From patchwork Sat Apr 17 03:12:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "David E. Box" X-Patchwork-Id: 12209469 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 68240C43600 for ; Sat, 17 Apr 2021 03:12:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 483A2610E6 for ; Sat, 17 Apr 2021 03:12:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235662AbhDQDNS (ORCPT ); Fri, 16 Apr 2021 23:13:18 -0400 Received: from mga06.intel.com ([134.134.136.31]:34209 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235608AbhDQDNQ (ORCPT ); Fri, 16 Apr 2021 23:13:16 -0400 IronPort-SDR: 8Wc11i9n9O7RRcaCUt6yMwdxnrSgtB4EJANX+ZeYZ4sjiwwVB4np3kgr/OXKVoqPyxp16RBxzJ DRJZQqvrIBLg== X-IronPort-AV: E=McAfee;i="6200,9189,9956"; a="256455866" X-IronPort-AV: E=Sophos;i="5.82,228,1613462400"; d="scan'208";a="256455866" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Apr 2021 20:12:50 -0700 IronPort-SDR: N6FH7MiD98g5cQmt2SjRa/GEAA/bg+vGb3V+JwHpcucmt5xTvOqLqApzAwZwqOCN32kH0He75O HPkD6Is8Pmlg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.82,228,1613462400"; d="scan'208";a="616120799" Received: from linux.intel.com ([10.54.29.200]) by fmsmga005.fm.intel.com with ESMTP; 16 Apr 2021 20:12:49 -0700 Received: from debox1-desk2.jf.intel.com (debox1-desk2.jf.intel.com [10.54.75.16]) by linux.intel.com (Postfix) with ESMTP id BD50458090C; Fri, 16 Apr 2021 20:12:49 -0700 (PDT) From: "David E. Box" To: irenic.rajneesh@gmail.com, david.e.box@linux.intel.com, hdegoede@redhat.com, mgross@linux.intel.com, gayatri.kammela@intel.com Cc: platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH V2 7/9] platform/x86: intel_pmc_core: Add option to set/clear LPM mode Date: Fri, 16 Apr 2021 20:12:50 -0700 Message-Id: <20210417031252.3020837-8-david.e.box@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210417031252.3020837-1-david.e.box@linux.intel.com> References: <20210417031252.3020837-1-david.e.box@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: platform-driver-x86@vger.kernel.org By default the Low Power Mode (LPM or sub-state) status registers will latch condition status on every entry into Package C10. This is configurable in the PMC to allow latching on any achievable sub-state. Add a debugfs file to support this. Also add the option to clear the status registers to 0. Clearing the status registers before testing removes ambiguity around when the current values were set. The new file, latch_lpm_mode, looks like this: [c10] S0i2.0 S0i3.0 S0i2.1 S0i3.1 S0i3.2 clear Signed-off-by: David E. Box Reviewed-by: Hans de Goede --- V2: - Rebase on Tamar/Tomas global reset patch that already adds Extended Test Register 3 - In write function, make sure count is 1 less than buffer to reserve space for '\0' - Use sysfs_streq to properly compare the input string drivers/platform/x86/intel_pmc_core.c | 112 ++++++++++++++++++++++++++ drivers/platform/x86/intel_pmc_core.h | 20 +++++ 2 files changed, 132 insertions(+) diff --git a/drivers/platform/x86/intel_pmc_core.c b/drivers/platform/x86/intel_pmc_core.c index 684f13f0c4a5..97cf3384c4c0 100644 --- a/drivers/platform/x86/intel_pmc_core.c +++ b/drivers/platform/x86/intel_pmc_core.c @@ -586,6 +586,7 @@ static const struct pmc_reg_map tgl_reg_map = { .ltr_ignore_max = TGL_NUM_IP_IGN_ALLOWED, .lpm_num_maps = TGL_LPM_NUM_MAPS, .lpm_res_counter_step_x2 = TGL_PMC_LPM_RES_COUNTER_STEP_X2, + .lpm_sts_latch_en_offset = TGL_LPM_STS_LATCH_EN_OFFSET, .lpm_en_offset = TGL_LPM_EN_OFFSET, .lpm_priority_offset = TGL_LPM_PRI_OFFSET, .lpm_residency_offset = TGL_LPM_RESIDENCY_OFFSET, @@ -1321,6 +1322,114 @@ static int pmc_core_substate_req_regs_show(struct seq_file *s, void *unused) } DEFINE_SHOW_ATTRIBUTE(pmc_core_substate_req_regs); +static int pmc_core_lpm_latch_mode_show(struct seq_file *s, void *unused) +{ + struct pmc_dev *pmcdev = s->private; + bool c10; + u32 reg; + int idx, mode; + + reg = pmc_core_reg_read(pmcdev, pmcdev->map->lpm_sts_latch_en_offset); + if (reg & LPM_STS_LATCH_MODE) { + seq_puts(s, "c10"); + c10 = false; + } else { + seq_puts(s, "[c10]"); + c10 = true; + } + + pmc_for_each_mode(idx, mode, pmcdev) { + if ((BIT(mode) & reg) && !c10) + seq_printf(s, " [%s]", pmc_lpm_modes[mode]); + else + seq_printf(s, " %s", pmc_lpm_modes[mode]); + } + + seq_puts(s, " clear\n"); + + return 0; +} + +static ssize_t pmc_core_lpm_latch_mode_write(struct file *file, + const char __user *userbuf, + size_t count, loff_t *ppos) +{ + struct seq_file *s = file->private_data; + struct pmc_dev *pmcdev = s->private; + bool clear = false, c10 = false; + unsigned char buf[8]; + size_t ret; + int idx, m, mode; + u32 reg; + + if (count > sizeof(buf) - 1) + return -EINVAL; + + ret = simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, userbuf, count); + if (ret < 0) + return ret; + + buf[count] = '\0'; + + /* + * Allowed strings are: + * Any enabled substate, e.g. 'S0i2.0' + * 'c10' + * 'clear' + */ + mode = sysfs_match_string(pmc_lpm_modes, buf); + + /* Check string matches enabled mode */ + pmc_for_each_mode(idx, m, pmcdev) + if (mode == m) + break; + + if (mode != m || mode < 0) { + if (sysfs_streq(buf, "clear")) + clear = true; + else if (sysfs_streq(buf, "c10")) + c10 = true; + else + return -EINVAL; + } + + if (clear) { + mutex_lock(&pmcdev->lock); + + reg = pmc_core_reg_read(pmcdev, pmcdev->map->etr3_offset); + reg |= ETR3_CLEAR_LPM_EVENTS; + pmc_core_reg_write(pmcdev, pmcdev->map->etr3_offset, reg); + + mutex_unlock(&pmcdev->lock); + + return count; + } + + if (c10) { + mutex_lock(&pmcdev->lock); + + reg = pmc_core_reg_read(pmcdev, pmcdev->map->lpm_sts_latch_en_offset); + reg &= ~LPM_STS_LATCH_MODE; + pmc_core_reg_write(pmcdev, pmcdev->map->lpm_sts_latch_en_offset, reg); + + mutex_unlock(&pmcdev->lock); + + return count; + } + + /* + * For LPM mode latching we set the latch enable bit and selected mode + * and clear everything else. + */ + reg = LPM_STS_LATCH_MODE | BIT(mode); + mutex_lock(&pmcdev->lock); + pmc_core_reg_write(pmcdev, pmcdev->map->lpm_sts_latch_en_offset, reg); + mutex_unlock(&pmcdev->lock); + + return count; +} +DEFINE_PMC_CORE_ATTR_WRITE(pmc_core_lpm_latch_mode); + static int pmc_core_pkgc_show(struct seq_file *s, void *unused) { struct pmc_dev *pmcdev = s->private; @@ -1439,6 +1548,9 @@ static void pmc_core_dbgfs_register(struct pmc_dev *pmcdev) debugfs_create_file("substate_live_status_registers", 0444, pmcdev->dbgfs_dir, pmcdev, &pmc_core_substate_l_sts_regs_fops); + debugfs_create_file("lpm_latch_mode", 0644, + pmcdev->dbgfs_dir, pmcdev, + &pmc_core_lpm_latch_mode_fops); } if (pmcdev->lpm_req_regs) { diff --git a/drivers/platform/x86/intel_pmc_core.h b/drivers/platform/x86/intel_pmc_core.h index 64fb368f40f6..c45805671c4a 100644 --- a/drivers/platform/x86/intel_pmc_core.h +++ b/drivers/platform/x86/intel_pmc_core.h @@ -189,6 +189,7 @@ enum ppfear_regs { #define LPM_MAX_NUM_MODES 8 #define GET_X2_COUNTER(v) ((v) >> 1) +#define LPM_STS_LATCH_MODE BIT(31) #define TGL_NUM_IP_IGN_ALLOWED 22 #define TGL_PMC_SLP_S0_RES_COUNTER_STEP 0x7A @@ -197,6 +198,7 @@ enum ppfear_regs { /* * Tigerlake Power Management Controller register offsets */ +#define TGL_LPM_STS_LATCH_EN_OFFSET 0x1C34 #define TGL_LPM_EN_OFFSET 0x1C78 #define TGL_LPM_RESIDENCY_OFFSET 0x1C80 @@ -211,6 +213,9 @@ enum ppfear_regs { #define ETR3_CF9GR BIT(20) #define ETR3_CF9LOCK BIT(31) +/* Extended Test Mode Register LPM bits (TGL and later */ +#define ETR3_CLEAR_LPM_EVENTS BIT(28) + const char *pmc_lpm_modes[] = { "S0i2.0", "S0i2.1", @@ -271,6 +276,7 @@ struct pmc_reg_map { /* Low Power Mode registers */ const int lpm_num_maps; const int lpm_res_counter_step_x2; + const u32 lpm_sts_latch_en_offset; const u32 lpm_en_offset; const u32 lpm_priority_offset; const u32 lpm_residency_offset; @@ -319,4 +325,18 @@ struct pmc_dev { i < pmcdev->num_lpm_modes; \ i++, mode = pmcdev->lpm_en_modes[i]) +#define DEFINE_PMC_CORE_ATTR_WRITE(__name) \ +static int __name ## _open(struct inode *inode, struct file *file) \ +{ \ + return single_open(file, __name ## _show, inode->i_private); \ +} \ + \ +static const struct file_operations __name ## _fops = { \ + .owner = THIS_MODULE, \ + .open = __name ## _open, \ + .read = seq_read, \ + .write = __name ## _write, \ + .release = single_release, \ +} + #endif /* PMC_CORE_H */