Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934186AbdDFLmR (ORCPT ); Thu, 6 Apr 2017 07:42:17 -0400 Received: from bh-25.webhostbox.net ([208.91.199.152]:47363 "EHLO bh-25.webhostbox.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933847AbdDFLmJ (ORCPT ); Thu, 6 Apr 2017 07:42:09 -0400 Subject: Re: [PATCH v6 4/6] watchdog: iTCO_wdt: Add PMC specific noreboot update api To: Kuppuswamy Sathyanarayanan , andy@infradead.org, qipeng.zha@intel.com, dvhart@infradead.org References: <3e7ca77c-2be5-5f89-f51f-faaca9f2d9ac@linux.intel.com> <686dfb634cc072d66080f6983900eefde8d85b5e.1491428146.git.sathyanarayanan.kuppuswamy@linux.intel.com> Cc: wim@iguana.be, sathyaosid@gmail.com, david.e.box@linux.intel.com, rajneesh.bhardwaj@intel.com, platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org, linux-watchdog@vger.kernel.org From: Guenter Roeck Message-ID: <7c48df01-b641-40d9-95d3-8724d34f5c8d@roeck-us.net> Date: Thu, 6 Apr 2017 04:42:04 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.5.1 MIME-Version: 1.0 In-Reply-To: <686dfb634cc072d66080f6983900eefde8d85b5e.1491428146.git.sathyanarayanan.kuppuswamy@linux.intel.com> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-Authenticated_sender: linux@roeck-us.net X-OutGoing-Spam-Status: No, score=-1.0 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - bh-25.webhostbox.net X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - roeck-us.net X-Get-Message-Sender-Via: bh-25.webhostbox.net: authenticated_id: linux@roeck-us.net X-Authenticated-Sender: bh-25.webhostbox.net: linux@roeck-us.net X-Source: X-Source-Args: X-Source-Dir: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4979 Lines: 132 On 04/05/2017 03:54 PM, Kuppuswamy Sathyanarayanan wrote: > In some SoCs, setting noreboot bit needs modification to > PMC GC registers. But not all PMC drivers allow other drivers > to memory map their GC region. This could create mem request > conflict in watchdog driver. So this patch adds facility to allow > PMC drivers to pass noreboot update function to watchdog > drivers via platform data. > > Signed-off-by: Kuppuswamy Sathyanarayanan > Acked-by: Guenter Roeck > --- > drivers/watchdog/iTCO_wdt.c | 20 ++++++++++++++------ > include/linux/platform_data/itco_wdt.h | 4 ++++ > 2 files changed, 18 insertions(+), 6 deletions(-) > > Changes since v5: > * Added priv_data to pass private data to no_reboot_bit update function. > * Changed update_noreboot_flag() to update_no_reboot_bit > > Changes since v4: > * Fixed some style issues. > * used false for 0 and true for 1 in update_noreboot_flag function. > > Changes since v3: > * Rebased on top of latest. > > Changes since v2: > * Removed use of PMC API's directly in watchdog driver. > * Added update_noreboot_flag to handle no IPC PMC compatibility > issue mentioned by Guenter. > > diff --git a/drivers/watchdog/iTCO_wdt.c b/drivers/watchdog/iTCO_wdt.c > index d8768a2..3f00029 100644 > --- a/drivers/watchdog/iTCO_wdt.c > +++ b/drivers/watchdog/iTCO_wdt.c > @@ -106,6 +106,8 @@ struct iTCO_wdt_private { > struct pci_dev *pci_dev; > /* whether or not the watchdog has been suspended */ > bool suspended; > + /* no reboot API private data */ > + void *no_reboot_priv; > /* no reboot update function pointer */ > int (*update_no_reboot_bit)(void *p, bool set); > }; > @@ -225,6 +227,8 @@ void iTCO_wdt_no_reboot_bit_setup(struct iTCO_wdt_private *p) > p->update_no_reboot_bit = update_no_reboot_bit_pci; > else > p->update_no_reboot_bit = update_no_reboot_bit_def; > + > + p->no_reboot_priv = p; > } > > static int iTCO_wdt_start(struct watchdog_device *wd_dev) > @@ -237,7 +241,7 @@ static int iTCO_wdt_start(struct watchdog_device *wd_dev) > iTCO_vendor_pre_start(p->smi_res, wd_dev->timeout); > > /* disable chipset's NO_REBOOT bit */ > - if (p->update_no_reboot_bit(p, false)) { > + if (p->update_no_reboot_bit(p->no_reboot_priv, false)) { > spin_unlock(&p->io_lock); > pr_err("failed to reset NO_REBOOT flag, reboot disabled by hardware/BIOS\n"); > return -EIO; > @@ -278,7 +282,7 @@ static int iTCO_wdt_stop(struct watchdog_device *wd_dev) > val = inw(TCO1_CNT(p)); > > /* Set the NO_REBOOT bit to prevent later reboots, just for sure */ > - p->update_no_reboot_bit(p, true); > + p->update_no_reboot_bit(p->no_reboot_priv, true); > > spin_unlock(&p->io_lock); > > @@ -442,14 +446,18 @@ static int iTCO_wdt_probe(struct platform_device *pdev) > > p->iTCO_version = pdata->version; > p->pci_dev = to_pci_dev(dev->parent); > + p->no_reboot_priv = pdata->no_reboot_priv; > This is really only for the if case below, and would be wrong otherwise. > - iTCO_wdt_no_reboot_bit_setup(p); > + if (pdata->update_no_reboot_bit) > + p->update_no_reboot_bit = pdata->update_no_reboot_bit; Can you move that initialization here ? Or, even better, pass pdata to iTCO_wdt_no_reboot_bit_setup() and initialize it there. > + else > + iTCO_wdt_no_reboot_bit_setup(p); > > /* > * Get the Memory-Mapped GCS or PMC register, we need it for the > * NO_REBOOT flag (TCO v2 and v3). > */ > - if (p->iTCO_version >= 2) { > + if (p->iTCO_version >= 2 && !pdata->update_no_reboot_bit) { > p->gcs_pmc_res = platform_get_resource(pdev, > IORESOURCE_MEM, > ICH_RES_MEM_GCS_PMC); > @@ -459,14 +467,14 @@ static int iTCO_wdt_probe(struct platform_device *pdev) > } > > /* Check chipset's NO_REBOOT bit */ > - if (p->update_no_reboot_bit(p, false) && > + if (p->update_no_reboot_bit(p->no_reboot_priv, false) && > iTCO_vendor_check_noreboot_on()) { > pr_info("unable to reset NO_REBOOT flag, device disabled by hardware/BIOS\n"); > return -ENODEV; /* Cannot reset NO_REBOOT bit */ > } > > /* Set the NO_REBOOT bit to prevent later reboots, just for sure */ > - p->update_no_reboot_bit(p, true); > + p->update_no_reboot_bit(p->no_reboot_priv, true); > > /* The TCO logic uses the TCO_EN bit in the SMI_EN register */ > if (!devm_request_region(dev, p->smi_res->start, > diff --git a/include/linux/platform_data/itco_wdt.h b/include/linux/platform_data/itco_wdt.h > index f16542c..0e95527 100644 > --- a/include/linux/platform_data/itco_wdt.h > +++ b/include/linux/platform_data/itco_wdt.h > @@ -14,6 +14,10 @@ > struct itco_wdt_platform_data { > char name[32]; > unsigned int version; > + /* private data to be passed to update_no_reboot_bit API */ > + void *no_reboot_priv; > + /* pointer for platform specific no reboot update function */ > + int (*update_no_reboot_bit)(void *priv, bool set); > }; > > #endif /* _ITCO_WDT_H_ */ >