From nobody Thu Oct 9 16:42:20 2025 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.9]) (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 A4B5D2E9732 for ; Tue, 17 Jun 2025 15:05:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.9 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750172738; cv=none; b=M3RWBPj1R0dEks/0lHyycp4na/6rT43AabDzyM9712u9VaQSDMVGRD2eZhqxrDA8XxfS6zpjW0ht2wKMJVAXuDbyDe854vimRPg4ALS5ihqk1jiXoRY3IrSMWUt6/sEpyA31gJ9ZYjujtjGcdpAkW+iDEEvL1wDViko1GYKo6h4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750172738; c=relaxed/simple; bh=whBs2iAagZKltqwmIXWaToW4Srekvx9gqm0G/7aOwhc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=k7zB0JGrFDz5gmplP6D8gnrcVMrUCF+YUziwMB20Vb029WYtp+iBQjYcHRuXtCLlaVaE8wMO+itx0KyP1XYSsUBjEd+of9sXNsXjQeGZEKKzZmghvf8EDOf5mKGo2tJ+idiUvy44XaSQg19PUPgbFVjTLxDdWRUECPO+BjThoNA= 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=YjZ75WEW; arc=none smtp.client-ip=192.198.163.9 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="YjZ75WEW" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1750172737; x=1781708737; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=whBs2iAagZKltqwmIXWaToW4Srekvx9gqm0G/7aOwhc=; b=YjZ75WEWMSyusE5PPF/QhyiexgsFrrY2h09x7hDFGyRz0VbN2+WdDgTE hQBclWf4lm2ASpFU4XxHxaEewWer8aNt9Pr2h5RRyb9jG7UneaWhZpQu6 5u1nSUPIEwptHivovvNSj8b2Pe3zr+Rxfk5gDXLeBIqAdCjKr5qt8Mpga mPxSb0nPHYD3wuzxERc1l+U9nKhhdf8gXdNMUayxJwonIG9O2Y+36h0fJ JrXM+V3Xa5RPY2h+/YcBy82KH657E3sLJmHVGxJbgqSgnxhf01BExBuWJ ExXc/VzQn5HvEukTLNwlQuO9RbbX7N3tDCjkCtwgwjB1dd4XYNYlTisIC Q==; X-CSE-ConnectionGUID: o1dTaVOXRiet3RDTkAIZAg== X-CSE-MsgGUID: hXaFlvIeRHOy6/NjqoQBvw== X-IronPort-AV: E=McAfee;i="6800,10657,11467"; a="63008738" X-IronPort-AV: E=Sophos;i="6.16,243,1744095600"; d="scan'208";a="63008738" Received: from fmviesa003.fm.intel.com ([10.60.135.143]) by fmvoesa103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jun 2025 08:05:37 -0700 X-CSE-ConnectionGUID: kdMoRDLJTxGzpmGblCnDKw== X-CSE-MsgGUID: Eeux6R3QT4+Zehgvx1wkWA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.16,243,1744095600"; d="scan'208";a="152672151" Received: from sannilnx-dsk.jer.intel.com ([10.12.231.107]) by fmviesa003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jun 2025 08:05:30 -0700 From: Alexander Usyskin To: Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , Lucas De Marchi , =?UTF-8?q?Thomas=20Hellstr=C3=B6m?= , Rodrigo Vivi , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Jani Nikula , Joonas Lahtinen , Tvrtko Ursulin , Karthik Poosa , Raag Jadav Cc: Reuven Abliyev , 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, Alexander Usyskin , Tomas Winkler Subject: [PATCH v14 1/8] mtd: add driver for intel graphics non-volatile memory device Date: Tue, 17 Jun 2025 17:51:51 +0300 Message-ID: <20250617145159.3803852-2-alexander.usyskin@intel.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250617145159.3803852-1-alexander.usyskin@intel.com> References: <20250617145159.3803852-1-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-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add auxiliary driver for intel discrete graphics non-volatile memory device. CC: Lucas De Marchi Reviewed-by: Raag Jadav Reviewed-by: Rodrigo Vivi Acked-by: Miquel Raynal Co-developed-by: Tomas Winkler Signed-off-by: Tomas Winkler Signed-off-by: Alexander Usyskin --- MAINTAINERS | 7 ++ drivers/mtd/devices/Kconfig | 11 +++ drivers/mtd/devices/Makefile | 1 + drivers/mtd/devices/mtd_intel_dg.c | 134 +++++++++++++++++++++++++++++ include/linux/intel_dg_nvm_aux.h | 30 +++++++ 5 files changed, 183 insertions(+) create mode 100644 drivers/mtd/devices/mtd_intel_dg.c create mode 100644 include/linux/intel_dg_nvm_aux.h diff --git a/MAINTAINERS b/MAINTAINERS index 7e7515a412e9..521730530243 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -12086,6 +12086,13 @@ L: linux-kernel@vger.kernel.org S: Supported F: arch/x86/include/asm/intel-family.h =20 +INTEL DISCRETE GRAPHICS NVM MTD DRIVER +M: Alexander Usyskin +L: linux-mtd@lists.infradead.org +S: Supported +F: drivers/mtd/devices/mtd_intel_dg.c +F: include/linux/intel_dg_nvm_aux.h + INTEL DRM DISPLAY FOR XE AND I915 DRIVERS M: Jani Nikula M: Rodrigo Vivi diff --git a/drivers/mtd/devices/Kconfig b/drivers/mtd/devices/Kconfig index aed653ce8fa2..46cebde79f34 100644 --- a/drivers/mtd/devices/Kconfig +++ b/drivers/mtd/devices/Kconfig @@ -183,6 +183,17 @@ config MTD_POWERNV_FLASH platforms from Linux. This device abstracts away the firmware interface for flash access. =20 +config MTD_INTEL_DG + tristate "Intel Discrete Graphics non-volatile memory driver" + depends on AUXILIARY_BUS + depends on MTD + help + This provides an MTD device to access Intel Discrete Graphics + non-volatile memory. + + To compile this driver as a module, choose M here: the module + will be called mtd-intel-dg. + comment "Disk-On-Chip Device Drivers" =20 config MTD_DOCG3 diff --git a/drivers/mtd/devices/Makefile b/drivers/mtd/devices/Makefile index d11eb2b8b6f8..9fe4ce9cffde 100644 --- a/drivers/mtd/devices/Makefile +++ b/drivers/mtd/devices/Makefile @@ -18,6 +18,7 @@ obj-$(CONFIG_MTD_SST25L) +=3D sst25l.o obj-$(CONFIG_MTD_BCM47XXSFLASH) +=3D bcm47xxsflash.o obj-$(CONFIG_MTD_ST_SPI_FSM) +=3D st_spi_fsm.o obj-$(CONFIG_MTD_POWERNV_FLASH) +=3D powernv_flash.o +obj-$(CONFIG_MTD_INTEL_DG) +=3D mtd_intel_dg.o =20 =20 CFLAGS_docg3.o +=3D -I$(src) diff --git a/drivers/mtd/devices/mtd_intel_dg.c b/drivers/mtd/devices/mtd_i= ntel_dg.c new file mode 100644 index 000000000000..c2d0dbfb0378 --- /dev/null +++ b/drivers/mtd/devices/mtd_intel_dg.c @@ -0,0 +1,134 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright(c) 2019-2025, Intel Corporation. All rights reserved. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +struct intel_dg_nvm { + struct kref refcnt; + void __iomem *base; + size_t size; + unsigned int nregions; + struct { + const char *name; + u8 id; + u64 offset; + u64 size; + } regions[] __counted_by(nregions); +}; + +static void intel_dg_nvm_release(struct kref *kref) +{ + struct intel_dg_nvm *nvm =3D container_of(kref, struct intel_dg_nvm, refc= nt); + int i; + + pr_debug("freeing intel_dg nvm\n"); + for (i =3D 0; i < nvm->nregions; i++) + kfree(nvm->regions[i].name); + kfree(nvm); +} + +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 =3D auxiliary_dev_to_intel_dg_nvm_dev(aux_d= ev); + struct intel_dg_nvm *nvm; + struct device *device; + unsigned int nregions; + unsigned int i, n; + int ret; + + device =3D &aux_dev->dev; + + /* count available regions */ + for (nregions =3D 0, i =3D 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 =3D kzalloc(struct_size(nvm, regions, nregions), GFP_KERNEL); + if (!nvm) + return -ENOMEM; + + kref_init(&nvm->refcnt); + + for (n =3D 0, i =3D 0; i < INTEL_DG_NVM_REGIONS; i++) { + if (!invm->regions[i].name) + continue; + + char *name =3D kasprintf(GFP_KERNEL, "%s.%s", + dev_name(&aux_dev->dev), invm->regions[i].name); + if (!name) + continue; + nvm->regions[n].name =3D name; + nvm->regions[n].id =3D i; + n++; + } + nvm->nregions =3D n; /* in case where kasprintf fail */ + + nvm->base =3D devm_ioremap_resource(device, &invm->bar); + if (IS_ERR(nvm->base)) { + ret =3D 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 =3D dev_get_drvdata(&aux_dev->dev); + + if (!nvm) + return; + + dev_set_drvdata(&aux_dev->dev, NULL); + + kref_put(&nvm->refcnt, intel_dg_nvm_release); +} + +static const struct auxiliary_device_id intel_dg_mtd_id_table[] =3D { + { + .name =3D "i915.nvm", + }, + { + .name =3D "xe.nvm", + }, + { + /* sentinel */ + } +}; +MODULE_DEVICE_TABLE(auxiliary, intel_dg_mtd_id_table); + +static struct auxiliary_driver intel_dg_mtd_driver =3D { + .probe =3D intel_dg_mtd_probe, + .remove =3D intel_dg_mtd_remove, + .driver =3D { + /* auxiliary_driver_register() sets .name to be the modname */ + }, + .id_table =3D intel_dg_mtd_id_table +}; +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..00b6c1301bd8 --- /dev/null +++ b/include/linux/intel_dg_nvm_aux.h @@ -0,0 +1,30 @@ +/* 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 +#include +#include +#include + +#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__ */ --=20 2.43.0