From patchwork Tue Aug 25 08:18:54 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Adrian Hunter X-Patchwork-Id: 11735125 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 47BE1109B for ; Tue, 25 Aug 2020 08:19:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 356302071E for ; Tue, 25 Aug 2020 08:19:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728599AbgHYITe (ORCPT ); Tue, 25 Aug 2020 04:19:34 -0400 Received: from mga18.intel.com ([134.134.136.126]:61045 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725924AbgHYITd (ORCPT ); Tue, 25 Aug 2020 04:19:33 -0400 IronPort-SDR: z5OEt4tTDHvp9pTl2LN67ZRv3cKJoip/E3Q1Tmc4KkNzZlR1Pi/wg/OzlcE5GmVl6gOQAaRa+7 DfdVBZ2LO4qQ== X-IronPort-AV: E=McAfee;i="6000,8403,9723"; a="143728909" X-IronPort-AV: E=Sophos;i="5.76,351,1592895600"; d="scan'208";a="143728909" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Aug 2020 01:19:30 -0700 IronPort-SDR: 14pHFxSM1Xk8lRdRpWgAS8Jn3WeAa4x706y7+MpfaoUG2UWvuXW9BY/7zAlkjmy0RWZ4kFjmgG HH45A2y+OOKg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.76,351,1592895600"; d="scan'208";a="336432480" Received: from ahunter-desktop.fi.intel.com ([10.237.72.73]) by FMSMGA003.fm.intel.com with ESMTP; 25 Aug 2020 01:19:28 -0700 From: Adrian Hunter To: "Martin K . Petersen" , "James E . J . Bottomley" Cc: linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, Alim Akhtar , Avri Altman Subject: [PATCH] scsi: ufs-pci: Add LTR support for Intel controllers Date: Tue, 25 Aug 2020 11:18:54 +0300 Message-Id: <20200825081854.7222-1-adrian.hunter@intel.com> X-Mailer: git-send-email 2.17.1 Organization: Intel Finland Oy, Registered Address: PL 281, 00181 Helsinki, Business Identity Code: 0357606 - 4, Domiciled in Helsinki Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Intel host controllers support the setting of latency tolerance. Accordingly, implement the PM QoS ->set_latency_tolerance() callback. The raw register values are also exposed via debugfs. Signed-off-by: Adrian Hunter Reviewed-by: Avri Altman --- drivers/scsi/ufs/ufshcd-pci.c | 122 +++++++++++++++++++++++++++++++++- 1 file changed, 120 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/ufs/ufshcd-pci.c b/drivers/scsi/ufs/ufshcd-pci.c index 5a95a7bfbab0..e10f05013ae6 100644 --- a/drivers/scsi/ufs/ufshcd-pci.c +++ b/drivers/scsi/ufs/ufshcd-pci.c @@ -13,6 +13,14 @@ #include "ufshcd.h" #include #include +#include +#include + +struct intel_host { + u32 active_ltr; + u32 idle_ltr; + struct dentry *debugfs_root; +}; static int ufs_intel_disable_lcc(struct ufs_hba *hba) { @@ -44,20 +52,129 @@ static int ufs_intel_link_startup_notify(struct ufs_hba *hba, return err; } +#define INTEL_ACTIVELTR 0x804 +#define INTEL_IDLELTR 0x808 + +#define INTEL_LTR_REQ BIT(15) +#define INTEL_LTR_SCALE_MASK GENMASK(11, 10) +#define INTEL_LTR_SCALE_1US (2 << 10) +#define INTEL_LTR_SCALE_32US (3 << 10) +#define INTEL_LTR_VALUE_MASK GENMASK(9, 0) + +static void intel_cache_ltr(struct ufs_hba *hba) +{ + struct intel_host *host = ufshcd_get_variant(hba); + + host->active_ltr = readl(hba->mmio_base + INTEL_ACTIVELTR); + host->idle_ltr = readl(hba->mmio_base + INTEL_IDLELTR); +} + +static void intel_ltr_set(struct device *dev, s32 val) +{ + struct ufs_hba *hba = dev_get_drvdata(dev); + struct intel_host *host = ufshcd_get_variant(hba); + u32 ltr; + + pm_runtime_get_sync(dev); + + /* + * Program latency tolerance (LTR) accordingly what has been asked + * by the PM QoS layer or disable it in case we were passed + * negative value or PM_QOS_LATENCY_ANY. + */ + ltr = readl(hba->mmio_base + INTEL_ACTIVELTR); + + if (val == PM_QOS_LATENCY_ANY || val < 0) { + ltr &= ~INTEL_LTR_REQ; + } else { + ltr |= INTEL_LTR_REQ; + ltr &= ~INTEL_LTR_SCALE_MASK; + ltr &= ~INTEL_LTR_VALUE_MASK; + + if (val > INTEL_LTR_VALUE_MASK) { + val >>= 5; + if (val > INTEL_LTR_VALUE_MASK) + val = INTEL_LTR_VALUE_MASK; + ltr |= INTEL_LTR_SCALE_32US | val; + } else { + ltr |= INTEL_LTR_SCALE_1US | val; + } + } + + if (ltr == host->active_ltr) + goto out; + + writel(ltr, hba->mmio_base + INTEL_ACTIVELTR); + writel(ltr, hba->mmio_base + INTEL_IDLELTR); + + /* Cache the values into intel_host structure */ + intel_cache_ltr(hba); +out: + pm_runtime_put(dev); +} + +static void ufs_intel_ltr_expose(struct ufs_hba *hba) +{ + struct intel_host *host = ufshcd_get_variant(hba); + struct dentry *dir = host->debugfs_root; + struct device *dev = hba->dev; + + dev->power.set_latency_tolerance = intel_ltr_set; + dev_pm_qos_expose_latency_tolerance(dev); + + intel_cache_ltr(hba); + + debugfs_create_x32("active_ltr", 0444, dir, &host->active_ltr); + debugfs_create_x32("idle_ltr", 0444, dir, &host->idle_ltr); +} + +static void ufs_intel_ltr_hide(struct ufs_hba *hba) +{ + struct device *dev = hba->dev; + + dev_pm_qos_hide_latency_tolerance(dev); + dev->power.set_latency_tolerance = NULL; +} + +static int ufs_intel_common_init(struct ufs_hba *hba) +{ + struct device *dev = hba->dev; + struct intel_host *host; + + host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL); + if (!host) + return -ENOMEM; + ufshcd_set_variant(hba, host); + host->debugfs_root = debugfs_create_dir(dev_name(dev), NULL); + ufs_intel_ltr_expose(hba); + return 0; +} + +static void ufs_intel_common_exit(struct ufs_hba *hba) +{ + struct intel_host *host = ufshcd_get_variant(hba); + + debugfs_remove_recursive(host->debugfs_root); + ufs_intel_ltr_hide(hba); +} + static int ufs_intel_ehl_init(struct ufs_hba *hba) { hba->quirks |= UFSHCD_QUIRK_BROKEN_AUTO_HIBERN8; - return 0; + return ufs_intel_common_init(hba); } static struct ufs_hba_variant_ops ufs_intel_cnl_hba_vops = { .name = "intel-pci", + .init = ufs_intel_common_init, + .exit = ufs_intel_common_exit, .link_startup_notify = ufs_intel_link_startup_notify, }; static struct ufs_hba_variant_ops ufs_intel_ehl_hba_vops = { .name = "intel-pci", .init = ufs_intel_ehl_init, + .exit = ufs_intel_common_exit, .link_startup_notify = ufs_intel_link_startup_notify, }; @@ -162,6 +279,8 @@ ufshcd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) return err; } + pci_set_drvdata(pdev, hba); + hba->vops = (struct ufs_hba_variant_ops *)id->driver_data; err = ufshcd_init(hba, mmio_base, pdev->irq); @@ -171,7 +290,6 @@ ufshcd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) return err; } - pci_set_drvdata(pdev, hba); pm_runtime_put_noidle(&pdev->dev); pm_runtime_allow(&pdev->dev);