From patchwork Fri Dec 9 21:45:20 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: matthew.gerlach@linux.intel.com X-Patchwork-Id: 633461 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5E518C4167B for ; Fri, 9 Dec 2022 21:45:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230094AbiLIVpd (ORCPT ); Fri, 9 Dec 2022 16:45:33 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39354 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229989AbiLIVpE (ORCPT ); Fri, 9 Dec 2022 16:45:04 -0500 Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E41603D381; Fri, 9 Dec 2022 13:45:02 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1670622303; x=1702158303; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=mwMQmcynqENJ3y9naQPa+ubp3a09jXnV9/AxFHnqRKo=; b=eEyHE4BqpIBEmztxPevIm5xRhUVH7m8UPktBJ668ZE9kyvr637QJ1c9A FrlNKBRLvtFgCaq7E4T1eS4bIi1aYDTxrO0q/kIA5/Zw5jPvEY1Xm4QD+ Jvw9ihpSmKuS5s9oGMIo/93zbD5CqcUJc8gZWYu+2fPj2FJcY35DSPZ2z vdBzR8AGQsC30EJikr3AdDuQFKugW7OZkeomckac8pO2jElOQ0tH3i3d6 c3ACwzdKgndUTgANAB3yytAIb++0ADsp8V6pcQ2G7jkGo9HX3in0veQ0i yqFbutys3PUcw+F0Ipu0g/xP5HOhdXOHZj9ijMKv8Ls19W7GeiwtiLFWY A==; X-IronPort-AV: E=McAfee;i="6500,9779,10556"; a="300975530" X-IronPort-AV: E=Sophos;i="5.96,232,1665471600"; d="scan'208";a="300975530" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Dec 2022 13:45:01 -0800 X-IronPort-AV: E=McAfee;i="6500,9779,10556"; a="711031688" X-IronPort-AV: E=Sophos;i="5.96,232,1665471600"; d="scan'208";a="711031688" Received: from rhweight-wrk1.ra.intel.com ([137.102.106.139]) by fmsmga008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Dec 2022 13:45:00 -0800 From: matthew.gerlach@linux.intel.com To: hao.wu@intel.com, yilun.xu@intel.com, russell.h.weight@intel.com, basheer.ahmed.muddebihal@intel.com, trix@redhat.com, mdf@kernel.org, linux-fpga@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, tianfei.zhang@intel.com, corbet@lwn.net, gregkh@linuxfoundation.org, linux-serial@vger.kernel.org, jirislaby@kernel.org, geert+renesas@glider.be, andriy.shevchenko@linux.intel.com, niklas.soderlund+renesas@ragnatech.se, macro@orcam.me.uk, johan@kernel.org, lukas@wunner.de, ilpo.jarvinen@linux.intel.com, marpagan@redhat.com Cc: Matthew Gerlach Subject: [PATCH v6 1/4] Documentation: fpga: dfl: Add documentation for DFHv1 Date: Fri, 9 Dec 2022 13:45:20 -0800 Message-Id: <20221209214523.3484193-2-matthew.gerlach@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221209214523.3484193-1-matthew.gerlach@linux.intel.com> References: <20221209214523.3484193-1-matthew.gerlach@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org From: Matthew Gerlach Add documentation describing the extensions provided by Version 1 of the Device Feature Header (DFHv1). Signed-off-by: Matthew Gerlach Reviewed-by: Ilpo Järvinen --- v5: use neested list for field descriptions clean up prose add reviewed-by and comments from Ilpo Järvinen v4: Remove marketing speak and separate v0 and v1 descriptions. Fix errors reported by "make htmldocs". v3: no change v2: s/GUILD/GUID/ add picture --- Documentation/fpga/dfl.rst | 103 +++++++++++++++++++++++++++++++++++++ 1 file changed, 103 insertions(+) diff --git a/Documentation/fpga/dfl.rst b/Documentation/fpga/dfl.rst index 15b670926084..606b4b070c33 100644 --- a/Documentation/fpga/dfl.rst +++ b/Documentation/fpga/dfl.rst @@ -561,6 +561,109 @@ new DFL feature via UIO direct access, its feature id should be added to the driver's id_table. +Device Feature Header - Version 0 +=========================================== +Version 0 (DFHv0) is the original version of the Device Feature Header. +The format of DFHv0 is shown below:: + + +-----------------------------------------------------------------------+ + |63 Type 60|59 DFH VER 52|51 Rsvd 41|40 EOL|39 Next 16|15 VER 12|11 ID 0| 0x00 + +-----------------------------------------------------------------------+ + |63 GUID_L 0| 0x08 + +-----------------------------------------------------------------------+ + |63 GUID_H 0| 0x10 + +-----------------------------------------------------------------------+ + +- Offset 0x00 + + * Type - The type of DFH (e.g. FME, AFU, or private feature). + * DFH VER - The version of the DFH. + * Rsvd - Currently unused. + * EOL - Set if this DFH is the end of the Device Feature List (DFL). + * Next - The offset of the next DFH in the DFL from the start of the DFH. If EOL is set, Next is the size of MMIO ofthe last feature in the list. + * ID - The ID of the feature if Type is private feature. + +- Offset 0x08 + + * GUID_L - Least significant 64 bits of a 128 bit Globally Unique Identifier (present only if Type is FME or AFU). + +- Offset 0x10 + + * GUID_H - Most significant 64 bits of a 128 bit Globally Unique Identifier (present only if Type is FME or AFU). + + +Device Feature Header - Version 1 +=========================================== +Version 1 (DFHv1) of the Device Feature Header adds the following functionality: + +* Provides a standardized mechanism for features to describe parameters/capabilities to software. +* Standardize the use of a GUID for all DFHv1 types. +* Decouples the location of the DFH from the register space of the feature itself. + +The format of Version 1 of the Device Feature Header (DFH) is shown below:: + + +-----------------------------------------------------------------------+ + |63 Type 60|59 DFH VER 52|51 Rsvd 41|40 EOL|39 Next 16|15 VER 12|11 ID 0| 0x00 + +-----------------------------------------------------------------------+ + |63 GUID_L 0| 0x08 + +-----------------------------------------------------------------------+ + |63 GUID_H 0| 0x10 + +-----------------------------------------------------------------------+ + |63 Reg Address/Offset 1| Rel 0| 0x18 + +-----------------------------------------------------------------------+ + |63 Reg Size 32|Params 31|30 Group 16|15 Instance 0| 0x20 + +-----------------------------------------------------------------------+ + |63 Next 35|34RSV33|EOP32|31 Param Version 16|15 Param ID 0| 0x28 + +-----------------------------------------------------------------------+ + |63 Parameter Data 0| 0x30 + +-----------------------------------------------------------------------+ + + ... + + +-----------------------------------------------------------------------+ + |63 Next 35|34RSV33|EOP32|31 Param Version 16|15 Param ID 0| + +-----------------------------------------------------------------------+ + |63 Parameter Data 0| + +-----------------------------------------------------------------------+ + +- Offset 0x00 + + * Type - The type of DFH (e.g. FME, AFU, or private feature). + * DFH VER - The version of the DFH. + * Rsvd - Currently unused. + * EOL - Set if this DFH is the end of the Device Feature List (DFL). + * Next - The offset of the next DFH in the DFL from the start of the DFH. + * ID - The ID of the feature if Type is private feature. + +- Offset 0x08 + + * GUID_L - Least significant 64 bits of a 128 bit Globally Unique Identifier. + +- Offset 0x10 + + * GUID_H - Most significant 64 bits of a 128 bit Globally Unique Identifier. + +- Offset 0x18 + + * Reg Address/Offset - If Rel bit is set, then the value is the high 63 bits of a 16 bit aligned absolute address of the feature's registers. If Rel bit is clear, then the value is the offset from the start of the DFH of the feature's registers. + +- Offset 0x20 + + * Reg Size - Size of feature's register set in bytes. + * Params - Set if DFH has a list of parameter blocks. + * Group - Id of group if feature is part of a group. + * Instance - Id of instance of feature within a group. + +- Offset 0x28 if feature has parameters + + * Next - Offset to the next parameter block in 8 byte words. If EOP set, size in 8 byte words of last parameter. + * Param Version - Version of Param ID. + * Param ID - ID of parameter. + +- Offset 0x30 + + * Parameter Data - Parameter data whose size and format is defined by version and ID of the parameter. + Open discussion =============== FME driver exports one ioctl (DFL_FPGA_FME_PORT_PR) for partial reconfiguration From patchwork Fri Dec 9 21:45:21 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: matthew.gerlach@linux.intel.com X-Patchwork-Id: 632853 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BF0E5C4332F for ; Fri, 9 Dec 2022 21:45:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230101AbiLIVpe (ORCPT ); Fri, 9 Dec 2022 16:45:34 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39614 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229995AbiLIVpE (ORCPT ); Fri, 9 Dec 2022 16:45:04 -0500 Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 293503D388; Fri, 9 Dec 2022 13:45:04 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1670622304; x=1702158304; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=+Troux3plCX6Y7bEBUpvaNT3RYvxGKTZirOxEMP6luE=; b=F3zquobitMngiZSbxEo4KanY6JtWTI6QwlsMjUxbxq2UhTRCoeUr+zcz C/q6b2SMrnh9fx7qR7cExxD9XbH+Jzu5b/wN40q+Al+KfYRvshzMy8e2Q SLZFzzMtalQghiqNEL4esA+ubbpBgZQDYKgDv6cELxKajHlDQeZU4h4Dr cAfEIBSAXimVtmrVoREGC4NK2PWIVreSrVLs6dtAobyOkMpZFTzPmeloZ Atf8wRmBhAbIgVPOd5iZEO7qg4nDYwsAygSYDADB+vStbSD7EQUwusHVM scvpX7kaRr6akeBkUCd3mfhJTuX4w2JJfEAOgfk6jxFfMtPF76dD8yNYD Q==; X-IronPort-AV: E=McAfee;i="6500,9779,10556"; a="300975543" X-IronPort-AV: E=Sophos;i="5.96,232,1665471600"; d="scan'208";a="300975543" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Dec 2022 13:45:03 -0800 X-IronPort-AV: E=McAfee;i="6500,9779,10556"; a="711031700" X-IronPort-AV: E=Sophos;i="5.96,232,1665471600"; d="scan'208";a="711031700" Received: from rhweight-wrk1.ra.intel.com ([137.102.106.139]) by fmsmga008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Dec 2022 13:45:01 -0800 From: matthew.gerlach@linux.intel.com To: hao.wu@intel.com, yilun.xu@intel.com, russell.h.weight@intel.com, basheer.ahmed.muddebihal@intel.com, trix@redhat.com, mdf@kernel.org, linux-fpga@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, tianfei.zhang@intel.com, corbet@lwn.net, gregkh@linuxfoundation.org, linux-serial@vger.kernel.org, jirislaby@kernel.org, geert+renesas@glider.be, andriy.shevchenko@linux.intel.com, niklas.soderlund+renesas@ragnatech.se, macro@orcam.me.uk, johan@kernel.org, lukas@wunner.de, ilpo.jarvinen@linux.intel.com, marpagan@redhat.com Cc: Basheer Ahmed Muddebihal , Matthew Gerlach Subject: [PATCH v6 2/4] fpga: dfl: Add DFHv1 Register Definitions Date: Fri, 9 Dec 2022 13:45:21 -0800 Message-Id: <20221209214523.3484193-3-matthew.gerlach@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221209214523.3484193-1-matthew.gerlach@linux.intel.com> References: <20221209214523.3484193-1-matthew.gerlach@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org From: Basheer Ahmed Muddebihal This patch adds the definitions for DFHv1 header and related register bitfields. Signed-off-by: Basheer Ahmed Muddebihal Co-developed-by: Matthew Gerlach Signed-off-by: Matthew Gerlach Reviewed-by: Ilpo Järvinen --- v6: remove parameter definitions from include/linux/dfl.h v5: consistently use fields for parameter data s/EOL/EOP/ to match doc remove unneeded mask added Co-developed-by v4: s/MSIX/MSI_X/g move kerneldoc to implementation don't change copyright date v3: keep DFHv1 definitions "hidden" in drivers/fpga/dfl.h v2: clean up whitespace and one line comments remove extra space in commit use uniform number of digits in constants don't change copyright date because of removed content --- drivers/fpga/dfl.h | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/drivers/fpga/dfl.h b/drivers/fpga/dfl.h index 06cfcd5e84bb..fc59f33367ee 100644 --- a/drivers/fpga/dfl.h +++ b/drivers/fpga/dfl.h @@ -74,11 +74,43 @@ #define DFH_REVISION GENMASK_ULL(15, 12) /* Feature revision */ #define DFH_NEXT_HDR_OFST GENMASK_ULL(39, 16) /* Offset to next DFH */ #define DFH_EOL BIT_ULL(40) /* End of list */ +#define DFH_VERSION GENMASK_ULL(59, 52) /* DFH version */ #define DFH_TYPE GENMASK_ULL(63, 60) /* Feature type */ #define DFH_TYPE_AFU 1 #define DFH_TYPE_PRIVATE 3 #define DFH_TYPE_FIU 4 +/* + * DFHv1 Register Offset definitons + * In DHFv1, DFH + GUID + CSR_START + CSR_SIZE_GROUP + PARAM_HDR + PARAM_DATA + * as common header registers + */ +#define DFHv1_CSR_ADDR 0x18 /* CSR Register start address */ +#define DFHv1_CSR_SIZE_GRP 0x20 /* Size of Reg Block and Group/tag */ +#define DFHv1_PARAM_HDR 0x28 /* Optional First Param header */ + +/* + * CSR Rel Bit, 1'b0 = relative (offset from feature DFH start), + * 1'b1 = absolute (ARM or other non-PCIe use) + */ +#define DFHv1_CSR_ADDR_REL BIT_ULL(0) + +/* CSR Header Register Bit Definitions */ +#define DFHv1_CSR_ADDR_MASK GENMASK_ULL(63, 1) /* 63:1 of CSR address */ + +/* CSR SIZE Goup Register Bit Definitions */ +#define DFHv1_CSR_SIZE_GRP_INSTANCE_ID GENMASK_ULL(15, 0) /* Enumeration instantiated IP */ +#define DFHv1_CSR_SIZE_GRP_GROUPING_ID GENMASK_ULL(30, 16) /* Group Features/interfaces */ +#define DFHv1_CSR_SIZE_GRP_HAS_PARAMS BIT_ULL(31) /* Presence of Parameters */ +#define DFHv1_CSR_SIZE_GRP_SIZE GENMASK_ULL(63, 32) /* Size of CSR Block in bytes */ + +/* PARAM Header Register Bit Definitions */ +#define DFHv1_PARAM_HDR_ID GENMASK_ULL(15, 0) /* Id of this Param */ +#define DFHv1_PARAM_HDR_VER GENMASK_ULL(31, 16) /* Version Param */ +#define DFHv1_PARAM_HDR_NEXT_OFFSET GENMASK_ULL(63, 35) /* Offset of next Param */ +#define DFHv1_PARAM_HDR_NEXT_EOP BIT_ULL(32) +#define DFHv1_PARAM_DATA 0x08 /* Offset of Param data from Param header */ + /* Next AFU Register Bitfield */ #define NEXT_AFU_NEXT_DFH_OFST GENMASK_ULL(23, 0) /* Offset to next AFU */ From patchwork Fri Dec 9 21:45:22 2022 Content-Type: text/plain; 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09 Dec 2022 13:45:03 -0800 From: matthew.gerlach@linux.intel.com To: hao.wu@intel.com, yilun.xu@intel.com, russell.h.weight@intel.com, basheer.ahmed.muddebihal@intel.com, trix@redhat.com, mdf@kernel.org, linux-fpga@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, tianfei.zhang@intel.com, corbet@lwn.net, gregkh@linuxfoundation.org, linux-serial@vger.kernel.org, jirislaby@kernel.org, geert+renesas@glider.be, andriy.shevchenko@linux.intel.com, niklas.soderlund+renesas@ragnatech.se, macro@orcam.me.uk, johan@kernel.org, lukas@wunner.de, ilpo.jarvinen@linux.intel.com, marpagan@redhat.com Cc: Matthew Gerlach Subject: [PATCH v6 3/4] fpga: dfl: add basic support for DFHv1 Date: Fri, 9 Dec 2022 13:45:22 -0800 Message-Id: <20221209214523.3484193-4-matthew.gerlach@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221209214523.3484193-1-matthew.gerlach@linux.intel.com> References: <20221209214523.3484193-1-matthew.gerlach@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org From: Matthew Gerlach Version 1 of the Device Feature Header (DFH) definition adds functionality to the DFL bus. A DFHv1 header may have one or more parameter blocks that further describes the HW to SW. Add support to the DFL bus to parse the MSI-X parameter. The location of a feature's register set is explicitly described in DFHv1 and can be relative to the base of the DFHv1 or an absolute address. Parse the location and pass the information to DFL driver. Signed-off-by: Matthew Gerlach Reviewed-by: Ilpo Järvinen --- v6: move MSI_X parameter definitions to drivers/fpga/dfl.h v5: update field names fix find_param/dfh_get_psize clean up mmio_res assignments use u64* instead of void* use FIELD_GET instead of masking v4: s/MSIX/MSI_X move kernel doc to implementation use structure assignment fix decode of absolute address clean up comment in parse_feature_irqs remove use of csr_res v3: remove unneeded blank line use clearer variable name pass finfo into parse_feature_irqs() refactor code for better indentation use switch statement for irq parsing squash in code parsing register location v2: fix kernel doc clarify use of DFH_VERSION field --- drivers/fpga/dfl.c | 234 ++++++++++++++++++++++++++++++++++---------- drivers/fpga/dfl.h | 9 ++ include/linux/dfl.h | 4 + 3 files changed, 196 insertions(+), 51 deletions(-) diff --git a/drivers/fpga/dfl.c b/drivers/fpga/dfl.c index b9aae85ba930..df63c96bcbfc 100644 --- a/drivers/fpga/dfl.c +++ b/drivers/fpga/dfl.c @@ -342,6 +342,8 @@ static void release_dfl_dev(struct device *dev) if (ddev->mmio_res.parent) release_resource(&ddev->mmio_res); + kfree(ddev->params); + ida_free(&dfl_device_ida, ddev->id); kfree(ddev->irqs); kfree(ddev); @@ -380,7 +382,16 @@ dfl_dev_add(struct dfl_feature_platform_data *pdata, ddev->type = feature_dev_id_type(pdev); ddev->feature_id = feature->id; ddev->revision = feature->revision; + ddev->dfh_version = feature->dfh_version; ddev->cdev = pdata->dfl_cdev; + if (feature->param_size) { + ddev->params = kmemdup(feature->params, feature->param_size, GFP_KERNEL); + if (!ddev->params) { + ret = -ENOMEM; + goto put_dev; + } + ddev->param_size = feature->param_size; + } /* add mmio resource */ parent_res = &pdev->resource[feature->resource_index]; @@ -708,20 +719,27 @@ struct build_feature_devs_info { * struct dfl_feature_info - sub feature info collected during feature dev build * * @fid: id of this sub feature. + * @revision: revision of this sub feature + * @dfh_version: version of Device Feature Header (DFH) * @mmio_res: mmio resource of this sub feature. * @ioaddr: mapped base address of mmio resource. * @node: node in sub_features linked list. * @irq_base: start of irq index in this sub feature. * @nr_irqs: number of irqs of this sub feature. + * @param_size: size DFH parameters. + * @params: DFH parameter data. */ struct dfl_feature_info { u16 fid; u8 revision; + u8 dfh_version; struct resource mmio_res; void __iomem *ioaddr; struct list_head node; unsigned int irq_base; unsigned int nr_irqs; + unsigned int param_size; + u64 params[]; }; static void dfl_fpga_cdev_add_port_dev(struct dfl_fpga_cdev *cdev, @@ -797,7 +815,17 @@ static int build_info_commit_dev(struct build_feature_devs_info *binfo) feature->dev = fdev; feature->id = finfo->fid; feature->revision = finfo->revision; + feature->dfh_version = finfo->dfh_version; + if (finfo->param_size) { + feature->params = devm_kmemdup(binfo->dev, + finfo->params, finfo->param_size, + GFP_KERNEL); + if (!feature->params) + return -ENOMEM; + + feature->param_size = finfo->param_size; + } /* * the FIU header feature has some fundamental functions (sriov * set, port enable/disable) needed for the dfl bus device and @@ -934,56 +962,105 @@ static u16 feature_id(u64 value) return 0; } +static u64 *find_param(u64 *params, resource_size_t max, int param_id) +{ + u64 *end = params + max / sizeof(u64); + u64 v, next; + + while (params < end) { + v = *params; + if (param_id == FIELD_GET(DFHv1_PARAM_HDR_ID, v)) + return params; + + next = FIELD_GET(DFHv1_PARAM_HDR_NEXT_OFFSET, v); + params += next; + if (FIELD_GET(DFHv1_PARAM_HDR_NEXT_EOP, v)) + break; + } + + return NULL; +} + +/** + * dfh_find_param() - find data for the given parameter id + * @dfl_dev: dfl device + * @param: id of dfl parameter + * + * Return: pointer to parameter header on success, NULL otherwise. + */ +u64 *dfh_find_param(struct dfl_device *dfl_dev, int param_id) +{ + return find_param(dfl_dev->params, dfl_dev->param_size, param_id); +} +EXPORT_SYMBOL_GPL(dfh_find_param); + static int parse_feature_irqs(struct build_feature_devs_info *binfo, - resource_size_t ofst, u16 fid, - unsigned int *irq_base, unsigned int *nr_irqs) + resource_size_t ofst, struct dfl_feature_info *finfo) { void __iomem *base = binfo->ioaddr + ofst; unsigned int i, ibase, inr = 0; + void *params = finfo->params; enum dfl_id_type type; + u16 fid = finfo->fid; int virq; + u64 *p; u64 v; - type = feature_dev_id_type(binfo->feature_dev); + switch (finfo->dfh_version) { + case 0: + /* + * DFHv0 only provides MMIO resource information for each feature + * in the DFL header. There is no generic interrupt information. + * Instead, features with interrupt functionality provide + * the information in feature specific registers. + */ + type = feature_dev_id_type(binfo->feature_dev); + if (type == PORT_ID) { + switch (fid) { + case PORT_FEATURE_ID_UINT: + v = readq(base + PORT_UINT_CAP); + ibase = FIELD_GET(PORT_UINT_CAP_FST_VECT, v); + inr = FIELD_GET(PORT_UINT_CAP_INT_NUM, v); + break; + case PORT_FEATURE_ID_ERROR: + v = readq(base + PORT_ERROR_CAP); + ibase = FIELD_GET(PORT_ERROR_CAP_INT_VECT, v); + inr = FIELD_GET(PORT_ERROR_CAP_SUPP_INT, v); + break; + } + } else if (type == FME_ID) { + switch (fid) { + case FME_FEATURE_ID_GLOBAL_ERR: + v = readq(base + FME_ERROR_CAP); + ibase = FIELD_GET(FME_ERROR_CAP_INT_VECT, v); + inr = FIELD_GET(FME_ERROR_CAP_SUPP_INT, v); + break; + } + } + break; - /* - * Ideally DFL framework should only read info from DFL header, but - * current version DFL only provides mmio resources information for - * each feature in DFL Header, no field for interrupt resources. - * Interrupt resource information is provided by specific mmio - * registers of each private feature which supports interrupt. So in - * order to parse and assign irq resources, DFL framework has to look - * into specific capability registers of these private features. - * - * Once future DFL version supports generic interrupt resource - * information in common DFL headers, the generic interrupt parsing - * code will be added. But in order to be compatible to old version - * DFL, the driver may still fall back to these quirks. - */ - if (type == PORT_ID) { - switch (fid) { - case PORT_FEATURE_ID_UINT: - v = readq(base + PORT_UINT_CAP); - ibase = FIELD_GET(PORT_UINT_CAP_FST_VECT, v); - inr = FIELD_GET(PORT_UINT_CAP_INT_NUM, v); - break; - case PORT_FEATURE_ID_ERROR: - v = readq(base + PORT_ERROR_CAP); - ibase = FIELD_GET(PORT_ERROR_CAP_INT_VECT, v); - inr = FIELD_GET(PORT_ERROR_CAP_SUPP_INT, v); + case 1: + /* + * DFHv1 provides interrupt resource information in DFHv1 + * parameter blocks. + */ + p = find_param(params, finfo->param_size, DFHv1_PARAM_ID_MSI_X); + if (!p) break; - } - } else if (type == FME_ID) { - if (fid == FME_FEATURE_ID_GLOBAL_ERR) { - v = readq(base + FME_ERROR_CAP); - ibase = FIELD_GET(FME_ERROR_CAP_INT_VECT, v); - inr = FIELD_GET(FME_ERROR_CAP_SUPP_INT, v); - } + + p++; + ibase = FIELD_GET(DFHv1_PARAM_MSI_X_STARTV, *p); + inr = FIELD_GET(DFHv1_PARAM_MSI_X_NUMV, *p); + break; + + default: + dev_warn(binfo->dev, "unexpected DFH version %d\n", finfo->dfh_version); + break; } if (!inr) { - *irq_base = 0; - *nr_irqs = 0; + finfo->irq_base = 0; + finfo->nr_irqs = 0; return 0; } @@ -1006,12 +1083,37 @@ static int parse_feature_irqs(struct build_feature_devs_info *binfo, } } - *irq_base = ibase; - *nr_irqs = inr; + finfo->irq_base = ibase; + finfo->nr_irqs = inr; return 0; } +static int dfh_get_psize(void __iomem *dfh_base, resource_size_t max) +{ + int size = 0; + u64 v, next; + + if (!FIELD_GET(DFHv1_CSR_SIZE_GRP_HAS_PARAMS, + readq(dfh_base + DFHv1_CSR_SIZE_GRP))) + return 0; + + while (size + DFHv1_PARAM_HDR < max) { + v = readq(dfh_base + DFHv1_PARAM_HDR + size); + + next = FIELD_GET(DFHv1_PARAM_HDR_NEXT_OFFSET, v); + if (!next) + return -EINVAL; + + size += next * sizeof(u64); + + if (FIELD_GET(DFHv1_PARAM_HDR_NEXT_EOP, v)) + return size; + } + + return -ENOENT; +} + /* * when create sub feature instances, for private features, it doesn't need * to provide resource size and feature id as they could be read from DFH @@ -1023,39 +1125,69 @@ static int create_feature_instance(struct build_feature_devs_info *binfo, resource_size_t ofst, resource_size_t size, u16 fid) { - unsigned int irq_base, nr_irqs; struct dfl_feature_info *finfo; + resource_size_t start, end; + int dfh_psize = 0; u8 revision = 0; + u64 v, addr_off; + u8 dfh_ver = 0; int ret; - u64 v; if (fid != FEATURE_ID_AFU) { v = readq(binfo->ioaddr + ofst); revision = FIELD_GET(DFH_REVISION, v); - + dfh_ver = FIELD_GET(DFH_VERSION, v); /* read feature size and id if inputs are invalid */ size = size ? size : feature_size(v); fid = fid ? fid : feature_id(v); + if (dfh_ver == 1) { + dfh_psize = dfh_get_psize(binfo->ioaddr + ofst, size); + if (dfh_psize < 0) { + dev_err(binfo->dev, + "failed to read size of DFHv1 parameters %d\n", + dfh_psize); + return dfh_psize; + } + dev_dbg(binfo->dev, "dfhv1_psize %d\n", dfh_psize); + } } if (binfo->len - ofst < size) return -EINVAL; - ret = parse_feature_irqs(binfo, ofst, fid, &irq_base, &nr_irqs); - if (ret) - return ret; - - finfo = kzalloc(sizeof(*finfo), GFP_KERNEL); + finfo = kzalloc(sizeof(*finfo) + dfh_psize, GFP_KERNEL); if (!finfo) return -ENOMEM; + memcpy_fromio(finfo->params, binfo->ioaddr + ofst + DFHv1_PARAM_HDR, dfh_psize); + finfo->param_size = dfh_psize; + finfo->fid = fid; finfo->revision = revision; - finfo->mmio_res.start = binfo->start + ofst; - finfo->mmio_res.end = finfo->mmio_res.start + size - 1; + finfo->dfh_version = dfh_ver; + if (dfh_ver == 1) { + v = readq(binfo->ioaddr + ofst + DFHv1_CSR_ADDR); + addr_off = FIELD_GET(DFHv1_CSR_ADDR_MASK, v); + if (FIELD_GET(DFHv1_CSR_ADDR_REL, v)) + start = addr_off << 1; + else + start = binfo->start + ofst + addr_off; + + v = readq(binfo->ioaddr + ofst + DFHv1_CSR_SIZE_GRP); + end = start + FIELD_GET(DFHv1_CSR_SIZE_GRP_SIZE, v) - 1; + } else { + start = binfo->start + ofst; + end = start + size - 1; + } finfo->mmio_res.flags = IORESOURCE_MEM; - finfo->irq_base = irq_base; - finfo->nr_irqs = nr_irqs; + finfo->mmio_res.start = start; + finfo->mmio_res.end = end; + + ret = parse_feature_irqs(binfo, ofst, finfo); + if (ret) { + kfree(finfo); + return ret; + } list_add_tail(&finfo->node, &binfo->sub_features); binfo->feature_num++; diff --git a/drivers/fpga/dfl.h b/drivers/fpga/dfl.h index fc59f33367ee..a21065cec04e 100644 --- a/drivers/fpga/dfl.h +++ b/drivers/fpga/dfl.h @@ -111,6 +111,10 @@ #define DFHv1_PARAM_HDR_NEXT_EOP BIT_ULL(32) #define DFHv1_PARAM_DATA 0x08 /* Offset of Param data from Param header */ +#define DFHv1_PARAM_ID_MSI_X 0x1 +#define DFHv1_PARAM_MSI_X_NUMV GENMASK_ULL(63, 32) +#define DFHv1_PARAM_MSI_X_STARTV GENMASK_ULL(31, 0) + /* Next AFU Register Bitfield */ #define NEXT_AFU_NEXT_DFH_OFST GENMASK_ULL(23, 0) /* Offset to next AFU */ @@ -272,11 +276,14 @@ struct dfl_feature_irq_ctx { * @ops: ops of this sub feature. * @ddev: ptr to the dfl device of this sub feature. * @priv: priv data of this feature. + * @param_size: size of dfh parameters + * @params: point to memory copy of dfh parameters */ struct dfl_feature { struct platform_device *dev; u16 id; u8 revision; + u8 dfh_version; int resource_index; void __iomem *ioaddr; struct dfl_feature_irq_ctx *irq_ctx; @@ -284,6 +291,8 @@ struct dfl_feature { const struct dfl_feature_ops *ops; struct dfl_device *ddev; void *priv; + unsigned int param_size; + void *params; }; #define FEATURE_DEV_ID_UNUSED (-1) diff --git a/include/linux/dfl.h b/include/linux/dfl.h index 431636a0dc78..a9b7ae84e5fd 100644 --- a/include/linux/dfl.h +++ b/include/linux/dfl.h @@ -39,9 +39,12 @@ struct dfl_device { u16 type; u16 feature_id; u8 revision; + u8 dfh_version; struct resource mmio_res; int *irqs; unsigned int num_irqs; + unsigned int param_size; + void *params; struct dfl_fpga_cdev *cdev; const struct dfl_device_id *id_entry; }; @@ -84,4 +87,5 @@ void dfl_driver_unregister(struct dfl_driver *dfl_drv); module_driver(__dfl_driver, dfl_driver_register, \ dfl_driver_unregister) +u64 *dfh_find_param(struct dfl_device *dfl_dev, int param); #endif /* __LINUX_DFL_H */ From patchwork Fri Dec 9 21:45:23 2022 Content-Type: text/plain; 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09 Dec 2022 13:45:04 -0800 From: matthew.gerlach@linux.intel.com To: hao.wu@intel.com, yilun.xu@intel.com, russell.h.weight@intel.com, basheer.ahmed.muddebihal@intel.com, trix@redhat.com, mdf@kernel.org, linux-fpga@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, tianfei.zhang@intel.com, corbet@lwn.net, gregkh@linuxfoundation.org, linux-serial@vger.kernel.org, jirislaby@kernel.org, geert+renesas@glider.be, andriy.shevchenko@linux.intel.com, niklas.soderlund+renesas@ragnatech.se, macro@orcam.me.uk, johan@kernel.org, lukas@wunner.de, ilpo.jarvinen@linux.intel.com, marpagan@redhat.com Cc: Matthew Gerlach Subject: [PATCH v6 4/4] tty: serial: 8250: add DFL bus driver for Altera 16550. Date: Fri, 9 Dec 2022 13:45:23 -0800 Message-Id: <20221209214523.3484193-5-matthew.gerlach@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221209214523.3484193-1-matthew.gerlach@linux.intel.com> References: <20221209214523.3484193-1-matthew.gerlach@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org From: Matthew Gerlach Add a Device Feature List (DFL) bus driver for the Altera 16550 implementation of UART. Signed-off-by: Matthew Gerlach Reviewed-by: Ilpo Järvinen --- v6: move driver specific parameter definitions to limit scope v5: removed unneeded blank line removed unneeded includes included device.h and types.h removed unneeded local variable remove calls to dev_dbg memset -> { } remove space after period explicitly include used headers remove redundant Inc from Copyright fix format specifier v4: use dev_err_probe() everywhere that is appropriate clean up noise change error messages to use the word, unsupported tried again to sort Makefile and KConfig better reorder probe function for easier error handling use new dfh_find_param API v3: use passed in location of registers use cleaned up functions for parsing parameters v2: clean up error messages alphabetize header files fix 'missing prototype' error by making function static tried to sort Makefile and Kconfig better --- drivers/tty/serial/8250/8250_dfl.c | 154 +++++++++++++++++++++++++++++ drivers/tty/serial/8250/Kconfig | 12 +++ drivers/tty/serial/8250/Makefile | 1 + 3 files changed, 167 insertions(+) create mode 100644 drivers/tty/serial/8250/8250_dfl.c diff --git a/drivers/tty/serial/8250/8250_dfl.c b/drivers/tty/serial/8250/8250_dfl.c new file mode 100644 index 000000000000..606279d420e0 --- /dev/null +++ b/drivers/tty/serial/8250/8250_dfl.c @@ -0,0 +1,154 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Driver for FPGA UART + * + * Copyright (C) 2022 Intel Corporation. + * + * Authors: + * Ananda Ravuri + * Matthew Gerlach + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#define DFHv1_PARAM_ID_CLK_FRQ 0x2 +#define DFHv1_PARAM_ID_FIFO_LEN 0x3 + +#define DFHv1_PARAM_ID_REG_LAYOUT 0x4 +#define DFHv1_PARAM_REG_LAYOUT_WIDTH GENMASK_ULL(63, 32) +#define DFHv1_PARAM_REG_LAYOUT_SHIFT GENMASK_ULL(31, 0) + +struct dfl_uart { + int line; +}; + +static int dfl_uart_get_params(struct dfl_device *dfl_dev, struct uart_8250_port *uart) +{ + struct device *dev = &dfl_dev->dev; + u32 reg_width; + u64 fifo_len; + u64 *p; + + p = dfh_find_param(dfl_dev, DFHv1_PARAM_ID_CLK_FRQ); + if (!p) + return dev_err_probe(dev, -EINVAL, "missing CLK_FRQ param\n"); + + p++; + uart->port.uartclk = *p; + + p = dfh_find_param(dfl_dev, DFHv1_PARAM_ID_FIFO_LEN); + if (!p) + return dev_err_probe(dev, -EINVAL, "missing FIFO_LEN param\n"); + + p++; + fifo_len = *p; + switch (fifo_len) { + case 32: + uart->port.type = PORT_ALTR_16550_F32; + break; + + case 64: + uart->port.type = PORT_ALTR_16550_F64; + break; + + case 128: + uart->port.type = PORT_ALTR_16550_F128; + break; + + default: + return dev_err_probe(dev, -EINVAL, "unsupported FIFO_LEN %llu\n", fifo_len); + } + + p = dfh_find_param(dfl_dev, DFHv1_PARAM_ID_REG_LAYOUT); + if (!p) + return dev_err_probe(dev, -EINVAL, "missing REG_LAYOUT param\n"); + + p++; + uart->port.regshift = FIELD_GET(DFHv1_PARAM_REG_LAYOUT_SHIFT, *p); + reg_width = FIELD_GET(DFHv1_PARAM_REG_LAYOUT_WIDTH, *p); + switch (reg_width) { + case 4: + uart->port.iotype = UPIO_MEM32; + break; + + case 2: + uart->port.iotype = UPIO_MEM16; + break; + + default: + return dev_err_probe(dev, -EINVAL, "unsupported reg-width %u\n", reg_width); + + } + + return 0; +} + +static int dfl_uart_probe(struct dfl_device *dfl_dev) +{ + struct device *dev = &dfl_dev->dev; + struct uart_8250_port uart = { }; + struct dfl_uart *dfluart; + int ret; + + uart.port.flags = UPF_IOREMAP; + uart.port.mapbase = dfl_dev->mmio_res.start; + uart.port.mapsize = resource_size(&dfl_dev->mmio_res); + + ret = dfl_uart_get_params(dfl_dev, &uart); + if (ret < 0) + return dev_err_probe(dev, ret, "failed uart feature walk\n"); + + if (dfl_dev->num_irqs == 1) + uart.port.irq = dfl_dev->irqs[0]; + + dfluart = devm_kzalloc(dev, sizeof(*dfluart), GFP_KERNEL); + if (!dfluart) + return -ENOMEM; + + dfluart->line = serial8250_register_8250_port(&uart); + if (dfluart->line < 0) + return dev_err_probe(dev, dfluart->line, "unable to register 8250 port.\n"); + + dev_set_drvdata(dev, dfluart); + + return 0; +} + +static void dfl_uart_remove(struct dfl_device *dfl_dev) +{ + struct dfl_uart *dfluart = dev_get_drvdata(&dfl_dev->dev); + + serial8250_unregister_port(dfluart->line); +} + +#define FME_FEATURE_ID_UART 0x24 + +static const struct dfl_device_id dfl_uart_ids[] = { + { FME_ID, FME_FEATURE_ID_UART }, + { } +}; +MODULE_DEVICE_TABLE(dfl, dfl_uart_ids); + +static struct dfl_driver dfl_uart_driver = { + .drv = { + .name = "dfl-uart", + }, + .id_table = dfl_uart_ids, + .probe = dfl_uart_probe, + .remove = dfl_uart_remove, +}; +module_dfl_driver(dfl_uart_driver); + +MODULE_DESCRIPTION("DFL Intel UART driver"); +MODULE_AUTHOR("Intel Corporation"); +MODULE_LICENSE("GPL"); diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig index b0f62345bc84..08af2acd4645 100644 --- a/drivers/tty/serial/8250/Kconfig +++ b/drivers/tty/serial/8250/Kconfig @@ -370,6 +370,18 @@ config SERIAL_8250_FSL erratum for Freescale 16550 UARTs in the 8250 driver. It also enables support for ACPI enumeration. +config SERIAL_8250_DFL + tristate "DFL bus driver for Altera 16550 UART" + depends on SERIAL_8250 && FPGA_DFL + help + This option enables support for a Device Feature List (DFL) bus + driver for the Altera 16650 UART. One or more Altera 16650 UARTs + can be instantiated in a FPGA and then be discovered during + enumeration of the DFL bus. + + To compile this driver as a module, chose M here: the + module will be called 8250_dfl. + config SERIAL_8250_DW tristate "Support for Synopsys DesignWare 8250 quirks" depends on SERIAL_8250 diff --git a/drivers/tty/serial/8250/Makefile b/drivers/tty/serial/8250/Makefile index 1615bfdde2a0..4e1a32812683 100644 --- a/drivers/tty/serial/8250/Makefile +++ b/drivers/tty/serial/8250/Makefile @@ -28,6 +28,7 @@ obj-$(CONFIG_SERIAL_8250_EXAR_ST16C554) += 8250_exar_st16c554.o obj-$(CONFIG_SERIAL_8250_HUB6) += 8250_hub6.o obj-$(CONFIG_SERIAL_8250_FSL) += 8250_fsl.o obj-$(CONFIG_SERIAL_8250_MEN_MCB) += 8250_men_mcb.o +obj-$(CONFIG_SERIAL_8250_DFL) += 8250_dfl.o obj-$(CONFIG_SERIAL_8250_DW) += 8250_dw.o obj-$(CONFIG_SERIAL_8250_EM) += 8250_em.o obj-$(CONFIG_SERIAL_8250_IOC3) += 8250_ioc3.o