From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 97C181624D5 for ; Fri, 24 Jul 2026 06:18:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=13.77.154.182 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784873881; cv=none; b=CgnQ8vtGVJl5P2eeDLo34mUvJZx9s6uQxz9DWivvoIfBKzLIZw4uhMZelU/rchdXa/fyHTqXFCpF0KxMbC5AdYNf6iUbpBokoo2kFDNBQpXPZICwpvMnQRm5DsRdUDq/mR+voMSWPI/+ni/bl67bffCwnM8Lb4FP0WCfDi9FnI0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784873881; c=relaxed/simple; bh=3pzif61tBllFFHCoSxkScHCSpVyeAX74O/w+I7N/Xs4=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=GHsNKTHRjYjtVH2pymJkcC254imrHzTQxjF/CIqInT3XxNmpKh0s+VN1BFTV+EnqLiWjEgjL4T2H1dA4P6P9iX3gCDxURFxw6kFUeSNWlqp3Fltr0uk4xYR+K4vado0eyQWFRD68XkaCZdaoOhrMJGj8d2LXgFtFKG1TeXtk90E= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com; spf=pass smtp.mailfrom=linux.microsoft.com; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b=gBhaVe/S; arc=none smtp.client-ip=13.77.154.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="gBhaVe/S" Received: from [10.94.177.11] (unknown [4.194.122.162]) by linux.microsoft.com (Postfix) with ESMTPSA id DA37620B7167; Thu, 23 Jul 2026 23:17:44 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com DA37620B7167 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1784873866; bh=VRpv6T+siWNkBqHSEcPyaMCGolHAkyNsTUU37plUbXY=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=gBhaVe/Sk1p4a1zqY0SbQg8TLSuQnOjOB5KIeLVAOVZHYPYvKbPLmsaF8C2l0u20p o46dth0yF+OnENkT91WMDrO/ynuDq5c4AOr4oUowOEdK50w3np62qsEOrGDdFooS75 tO6oQ8NG1vpBijXTdXIEvPVxmkcZzEbjRLa3UVRs= Message-ID: <976333d5-01d5-433a-ad02-56d6b1249af3@linux.microsoft.com> Date: Fri, 24 Jul 2026 11:47:57 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/4] firmware: xilinx: Release all peripheral devices from firmware To: Jay Buddhabhatti , michal.simek@amd.com, git@amd.com Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <20260723124841.2567827-1-jay.buddhabhatti@amd.com> <20260723124841.2567827-3-jay.buddhabhatti@amd.com> Content-Language: en-US From: Prasanna Kumar T S M In-Reply-To: <20260723124841.2567827-3-jay.buddhabhatti@amd.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 23-07-2026 18:18, Jay Buddhabhatti wrote: > During a kexec restart, only the kernel is reloaded while devices > allocated in firmware persist, causing state mismatches between the > kernel and firmware. > > Introduce PM_DEV_ALL_PERIPH node ID (0x18224FFFU) to release all > peripheral devices during kexec. On graceful restarts, this happens in > zynqmp_firmware_shutdown(). On crash kernel restarts, it happens in > zynqmp_firmware_probe() of the reloaded kernel. > > Releasing all peripherals depends on firmware support for the > PM_DEV_ALL_PERIPH node ID. On firmware that does not implement it (the > feature check reports a version below PM_API_VERSION_3) the release is > skipped and a warning such as "Bulk device release is not supported by > firmware" is logged, e.g. on Versal NET firmware that predates this API. > > Signed-off-by: Jay Buddhabhatti > --- > drivers/firmware/xilinx/zynqmp.c | 15 ++++++++++++++- > include/linux/firmware/xlnx-zynqmp.h | 4 ++++ > 2 files changed, 18 insertions(+), 1 deletion(-) > > diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c > index 95ffd8f33ce9..64d2109eefd2 100644 > --- a/drivers/firmware/xilinx/zynqmp.c > +++ b/drivers/firmware/xilinx/zynqmp.c > @@ -2070,7 +2070,7 @@ ATTRIBUTE_GROUPS(zynqmp_firmware); > * zynqmp_clear_pm_state() - Clear subsystem state > * @dev: Device pointer used for logging > * > - * Clears PM specific data in TF-A. > + * Clears PM specific data in TF-A and firmware. > * > * Return: Returns status, either success or error > */ > @@ -2097,6 +2097,19 @@ static int zynqmp_clear_pm_state(struct device *dev) > dev_warn(dev, "TF_A_CLEAR_PM_STATE is not supported in TF-A: %d\n", ret); > ret = 0; > } > + > + /* Check if the firmware supports the PM_DEV_ALL_PERIPH node ID */ > + ret = do_feature_check_call(PM_RELEASE_NODE); > + if (ret >= 0 && ((ret & FIRMWARE_VERSION_MASK) >= PM_API_VERSION_3)) { > + /* Attempt to release all peripheral devices via firmware */ > + ret = zynqmp_pm_release_node(PM_DEV_ALL_PERIPH); > + if (ret) > + dev_err(dev, "Failed to release all peripheral devices: %d\n", ret); > + } else { > + dev_warn(dev, > + "Bulk device release is not supported by firmware: %d\n", ret); > + ret = 0; > + } > } > > return ret; > diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h > index baaa88b0b197..ac39e5492961 100644 > --- a/include/linux/firmware/xlnx-zynqmp.h > +++ b/include/linux/firmware/xlnx-zynqmp.h > @@ -50,6 +50,7 @@ > /* PM API versions */ > #define PM_API_VERSION_1 1 > #define PM_API_VERSION_2 2 > +#define PM_API_VERSION_3 3 > > #define PM_PINCTRL_PARAM_SET_VERSION 2 > > @@ -145,6 +146,9 @@ > #define XPM_EVENT_ERROR_MASK_NOC_NCR BIT(13) > #define XPM_EVENT_ERROR_MASK_NOC_CR BIT(12) > > +/* Node ID for all peripheral devices */ > +#define PM_DEV_ALL_PERIPH 0x18224FFFU > + > enum pm_module_id { > PM_MODULE_ID = 0x0, > XPM_MODULE_ID = 0x2, Looks good to me. Reviewed-by: Prasanna Kumar T S M