From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3BD8C297A40 for ; Tue, 29 Apr 2025 09:31:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.10 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745919103; cv=none; b=Ikemf3Kv6U+qM0mZZgect5dp20oLVqjlMkSsQf8MDLMQ5DRmOyKdf5hpL0TaD63o14UVRb/7FNGCffLVjx+IS8vLKM9k4QcziCAoEhTifTzRbas0K9sSB6yZr9Tka60i28blt5zu5uE+DMMhY8PaWJ1g0dSUqR4JUWzrxotWnLc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1745919103; c=relaxed/simple; bh=JSp33XGPTyatueK4o6jd84vVu0TKMpsc3F+Uq/MAUeo=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=L3LNsZtYZGTDgcCyVhkDHdKspsanD1xcHCYr08Bik6STVxXJmYyFPmMMWKaT+0deJlbvaKhHZUcXeEYJSVXuQ2OHhs/l4HFMbGdSaa6GSlbKs0pPyGXhLUaMvQ23j40ltwm9YqU0GT9G6/gcspq7TpjGf+wsenygpefd9Zz9BfA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=cWUqEJV2; arc=none smtp.client-ip=198.175.65.10 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="cWUqEJV2" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1745919102; x=1777455102; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=JSp33XGPTyatueK4o6jd84vVu0TKMpsc3F+Uq/MAUeo=; b=cWUqEJV2SZJGt59J/Mdi8jwzN/1M47mRWli2V9TxdNEE7guyEZAoEJax KE+bQ+iG6km6edOSH0OcDDXUAg/jLNPY1VlVJsWkdMfaZ1iD0/DKQ8pcw 460rSn607H6fUlsJ2DSAa4E1Jx0wya715/ElSotVtJpVveH/i0vwGxDyU nrWAO1vB8Wg/AczzTs5tMoyWH4vIDYb8t5WlrOxVBfAS036Rk/ergOQv1 18szxXe2jEEsOiRXDm7RqWLnEw5eQoiOB071BkwjgO041dWMPNQMPlqEF 1uBU3NArZmrRd1zC8MyHD1LfC+jQdup/7hnNPgUD/9GOS5vbIpsBM1kWZ A==; X-CSE-ConnectionGUID: wooKWWgIQFmEixdnIyz/tg== X-CSE-MsgGUID: 8jLJqeUwQYStNEsMlqAikA== X-IronPort-AV: E=McAfee;i="6700,10204,11417"; a="64950251" X-IronPort-AV: E=Sophos;i="6.15,248,1739865600"; d="scan'208";a="64950251" Received: from fmviesa008.fm.intel.com ([10.60.135.148]) by orvoesa102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Apr 2025 02:31:41 -0700 X-CSE-ConnectionGUID: vSTcVcNKRbqprzBtYgZZqQ== X-CSE-MsgGUID: EItLiXMqRMC9ILIgbEryWQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.15,248,1739865600"; d="scan'208";a="134086830" Received: from black.fi.intel.com ([10.237.72.28]) by fmviesa008.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Apr 2025 02:31:35 -0700 Date: Tue, 29 Apr 2025 12:31:32 +0300 From: Raag Jadav To: Alexander Usyskin Cc: Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Lucas De Marchi , Thomas =?iso-8859-1?Q?Hellstr=F6m?= , Rodrigo Vivi , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Jani Nikula , Joonas Lahtinen , Tvrtko Ursulin , Karthik Poosa , Reuven Abliyev , Oren Weil , linux-mtd@lists.infradead.org, intel-xe@lists.freedesktop.org, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org, Tomas Winkler Subject: Re: [PATCH v9 02/12] mtd: add driver for intel graphics non-volatile memory device Message-ID: References: <20250424132536.3043825-1-alexander.usyskin@intel.com> <20250424132536.3043825-3-alexander.usyskin@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250424132536.3043825-3-alexander.usyskin@intel.com> On Thu, Apr 24, 2025 at 04:25:26PM +0300, Alexander Usyskin wrote: > Add auxiliary driver for intel discrete graphics > non-volatile memory device. ... > +static int intel_dg_mtd_probe(struct auxiliary_device *aux_dev, > + const struct auxiliary_device_id *aux_dev_id) > +{ > + struct intel_dg_nvm_dev *invm = auxiliary_dev_to_intel_dg_nvm_dev(aux_dev); > + struct device *device; > + struct intel_dg_nvm *nvm; > + unsigned int nregions; > + unsigned int i, n; > + char *name; Perhaps move this to the loop it is being used in? > + int ret; > + > + device = &aux_dev->dev; > + > + /* count available regions */ > + for (nregions = 0, i = 0; i < INTEL_DG_NVM_REGIONS; i++) { > + if (invm->regions[i].name) > + nregions++; > + } > + > + if (!nregions) { > + dev_err(device, "no regions defined\n"); > + return -ENODEV; > + } > + > + nvm = kzalloc(struct_size(nvm, regions, nregions), GFP_KERNEL); > + if (!nvm) > + return -ENOMEM; > + > + kref_init(&nvm->refcnt); > + > + nvm->nregions = nregions; Is this assignment useful? > + for (n = 0, i = 0; i < INTEL_DG_NVM_REGIONS; i++) { > + if (!invm->regions[i].name) > + continue; > + > + name = kasprintf(GFP_KERNEL, "%s.%s", > + dev_name(&aux_dev->dev), invm->regions[i].name); > + if (!name) > + continue; > + nvm->regions[n].name = name; > + nvm->regions[n].id = i; > + n++; > + } > + nvm->nregions = n; /* in case where kasprintf fail */ Considering kasprintf failure, should we move forward if n == 0? > + nvm->base = devm_ioremap_resource(device, &invm->bar); > + if (IS_ERR(nvm->base)) { > + dev_err(device, "mmio not mapped\n"); Is this useful? Perhaps the helper already does it for us. > + ret = PTR_ERR(nvm->base); > + goto err; > + } > + > + dev_set_drvdata(&aux_dev->dev, nvm); > + > + return 0; > + > +err: > + kref_put(&nvm->refcnt, intel_dg_nvm_release); > + return ret; > +} > + > +static void intel_dg_mtd_remove(struct auxiliary_device *aux_dev) > +{ > + struct intel_dg_nvm *nvm = dev_get_drvdata(&aux_dev->dev); > + > + if (!nvm) > + return; Are we expecting this? > + dev_set_drvdata(&aux_dev->dev, NULL); Do we need this? > + kref_put(&nvm->refcnt, intel_dg_nvm_release); > +} > + > +static const struct auxiliary_device_id intel_dg_mtd_id_table[] = { > + { > + .name = "i915.nvm", > + }, > + { > + .name = "xe.nvm", > + }, > + { > + /* sentinel */ > + } > +}; > +MODULE_DEVICE_TABLE(auxiliary, intel_dg_mtd_id_table); > + > +static struct auxiliary_driver intel_dg_mtd_driver = { > + .probe = intel_dg_mtd_probe, > + .remove = intel_dg_mtd_remove, > + .driver = { > + /* auxiliary_driver_register() sets .name to be the modname */ > + }, > + .id_table = intel_dg_mtd_id_table > +}; > + Nit: Redundant blank line. > +module_auxiliary_driver(intel_dg_mtd_driver); > + > +MODULE_LICENSE("GPL"); > +MODULE_AUTHOR("Intel Corporation"); > +MODULE_DESCRIPTION("Intel DGFX MTD driver"); > diff --git a/include/linux/intel_dg_nvm_aux.h b/include/linux/intel_dg_nvm_aux.h > new file mode 100644 > index 000000000000..68df634c994c > --- /dev/null > +++ b/include/linux/intel_dg_nvm_aux.h > @@ -0,0 +1,27 @@ > +/* SPDX-License-Identifier: MIT */ > +/* > + * Copyright(c) 2019-2025, Intel Corporation. All rights reserved. > + */ > + > +#ifndef __INTEL_DG_NVM_AUX_H__ > +#define __INTEL_DG_NVM_AUX_H__ > + > +#include Missing types.h, container_of.h > +#define INTEL_DG_NVM_REGIONS 13 > + > +struct intel_dg_nvm_region { > + const char *name; > +}; > + > +struct intel_dg_nvm_dev { > + struct auxiliary_device aux_dev; > + bool writable_override; > + struct resource bar; > + const struct intel_dg_nvm_region *regions; > +}; > + > +#define auxiliary_dev_to_intel_dg_nvm_dev(auxiliary_dev) \ > + container_of(auxiliary_dev, struct intel_dg_nvm_dev, aux_dev) > + > +#endif /* __INTEL_DG_NVM_AUX_H__ */ > -- > 2.43.0 >