From patchwork Tue Sep 6 19:04:25 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: matthew.gerlach@linux.intel.com X-Patchwork-Id: 603300 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 9B91EECAAA1 for ; Tue, 6 Sep 2022 19:04:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229785AbiIFTEe (ORCPT ); Tue, 6 Sep 2022 15:04:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51388 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229717AbiIFTEa (ORCPT ); Tue, 6 Sep 2022 15:04:30 -0400 Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3AFDA6146; Tue, 6 Sep 2022 12:04:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1662491065; x=1694027065; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=ICHPytA3pO1SwHmblkHrU9c7giwKu6jTGgG0MhX7gT0=; b=MtbNYrgRUd2hSeawg8wOIPwwkhSZe6o65izj/vwR4GTpK0XkQP0k0PC7 9DE8FVsgq3a7GLeA3Y5PR1yhV4uLdQNYN1Cx3ZAn61b0icprfYZpyozih mBIZKKiRt57+1nBIabrADQDJMFf4cyDHQe5RkxXRSqWBgcy0B4S9aWW8U 9tnnA9LrokrDmOHPZ+nPhYYDVe5w+ozq1nHKjnklYLHkon+RA0FCpYU0T ZKlZc0ljs9FwxPFT+VtzcLhMNi4jqZt4io2g9iTlJllJs7+kE/O0RNjRZ gxDfZgjM6qSK3vIdfZ9C6TioSx0C2egX27rGooCR21b5pi/OBvzDY+NWu Q==; X-IronPort-AV: E=McAfee;i="6500,9779,10462"; a="283677339" X-IronPort-AV: E=Sophos;i="5.93,294,1654585200"; d="scan'208";a="283677339" Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Sep 2022 12:04:18 -0700 X-IronPort-AV: E=Sophos;i="5.93,294,1654585200"; d="scan'208";a="789782551" Received: from rhweight-wrk1.ra.intel.com ([137.102.106.43]) by orsmga005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Sep 2022 12:04:18 -0700 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, phil.edworthy@renesas.com, macro@orcam.me.uk, johan@kernel.org, lukas@wunner.de Cc: Matthew Gerlach Subject: [PATCH v1 4/5] fpga: dfl: add generic support for MSIX interrupts Date: Tue, 6 Sep 2022 12:04:25 -0700 Message-Id: <20220906190426.3139760-5-matthew.gerlach@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220906190426.3139760-1-matthew.gerlach@linux.intel.com> References: <20220906190426.3139760-1-matthew.gerlach@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org From: Matthew Gerlach Define and use a DFHv1 parameter to add generic support for MSIX interrupts for DFL devices. Signed-off-by: Matthew Gerlach --- drivers/fpga/dfl.c | 59 +++++++++++++++++++++++++++++++++------------ include/linux/dfl.h | 13 ++++++++++ 2 files changed, 57 insertions(+), 15 deletions(-) diff --git a/drivers/fpga/dfl.c b/drivers/fpga/dfl.c index b9aae85ba930..17f704dc8483 100644 --- a/drivers/fpga/dfl.c +++ b/drivers/fpga/dfl.c @@ -941,25 +941,11 @@ static int parse_feature_irqs(struct build_feature_devs_info *binfo, void __iomem *base = binfo->ioaddr + ofst; unsigned int i, ibase, inr = 0; enum dfl_id_type type; - int virq; + int virq, off; u64 v; type = feature_dev_id_type(binfo->feature_dev); - /* - * 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: @@ -981,6 +967,28 @@ static int parse_feature_irqs(struct build_feature_devs_info *binfo, } } + if (fid != FEATURE_ID_AFU && fid != PORT_FEATURE_ID_ERROR && + fid != PORT_FEATURE_ID_UINT && fid != FME_FEATURE_ID_GLOBAL_ERR) { + v = readq(base); + v = FIELD_GET(DFH_VERSION, v); + + if (v == 1) { + v = readq(base + DFHv1_CSR_SIZE_GRP); + if (FIELD_GET(DFHv1_CSR_SIZE_GRP_HAS_PARAMS, v)) { + off = dfl_find_param(base + DFHv1_PARAM_HDR, ofst, + DFHv1_PARAM_ID_MSIX); + if (off >= 0) { + ibase = readl(base + DFHv1_PARAM_HDR + + off + DFHv1_PARAM_MSIX_STARTV); + inr = readl(base + DFHv1_PARAM_HDR + + off + DFHv1_PARAM_MSIX_NUMV); + dev_dbg(binfo->dev, "%s start %d num %d fid 0x%x\n", + __func__, ibase, inr, fid); + } + } + } + } + if (!inr) { *irq_base = 0; *nr_irqs = 0; @@ -1879,6 +1887,27 @@ long dfl_feature_ioctl_set_irq(struct platform_device *pdev, } EXPORT_SYMBOL_GPL(dfl_feature_ioctl_set_irq); +int dfl_find_param(void __iomem *base, resource_size_t max, int param) +{ + int off = 0; + u64 v, next; + + while (off < max) { + v = readq(base + off); + if (param == FIELD_GET(DFHv1_PARAM_HDR_ID, v)) + return off; + + next = FIELD_GET(DFHv1_PARAM_HDR_NEXT_OFFSET, v); + if (!next) + break; + + off += next; + } + + return -ENOENT; +} +EXPORT_SYMBOL_GPL(dfl_find_param); + static void __exit dfl_fpga_exit(void) { dfl_chardev_uinit(); diff --git a/include/linux/dfl.h b/include/linux/dfl.h index 61bcf20c1bc8..5652879ab48e 100644 --- a/include/linux/dfl.h +++ b/include/linux/dfl.h @@ -69,6 +69,10 @@ #define DFHv1_PARAM_HDR_VERSION GENMASK_ULL(31, 16) /* Version Param */ #define DFHv1_PARAM_HDR_NEXT_OFFSET GENMASK_ULL(63, 32) /* Offset of next Param */ +#define DFHv1_PARAM_ID_MSIX 0x1 +#define DFHv1_PARAM_MSIX_STARTV 0x8 +#define DFHv1_PARAM_MSIX_NUMV 0xc + /** * enum dfl_id_type - define the DFL FIU types */ @@ -142,4 +146,13 @@ void dfl_driver_unregister(struct dfl_driver *dfl_drv); module_driver(__dfl_driver, dfl_driver_register, \ dfl_driver_unregister) +/* + * dfl_find_param() - find the offset of the given parameter + * @base: base pointer to start of dfl parameters in DFH + * @max: maximum offset to search + * @param: id of dfl parameter + * + * Return: positive offset on success, negative error code otherwise. + */ +int dfl_find_param(void __iomem *base, resource_size_t max, int param); #endif /* __LINUX_DFL_H */