From patchwork Fri Feb 14 15:35:26 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cristian Marussi X-Patchwork-Id: 11382547 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 9957C13A4 for ; Fri, 14 Feb 2020 15:37:34 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 7361C2467B for ; Fri, 14 Feb 2020 15:37:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="RN+avMFv" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7361C2467B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=y8yita2hSDEii/2p5lCM4iLYuaRnfjEGW5Il0lYY6bU=; b=RN+avMFvtl8bw9Yien3t3GXNMk CE9peXed2NAb0ZyVxg665knL7thOEp3BoJU+Krui8O4bLCxUQpwatc1LTk/YwXGG+eaZJJxnOMIBz zGqfF9oIHWC90yMXbcmWCuR2AKtvVmB9OjapbVLT8tOWwO3AvtYr21QRX8gs5UvLjL2hXtNYbNNbQ nb+ViHi4PgwiU+8QYcZ4KLRz6tbtEut7P1k21vVL/k+EEzebjzH9NagAt74M7h3+9LYJRbAFt/UfW p7t9zbhCTAa25ijphHl6Jmj34fH61E0jGvFbnBPmeu5Myaw/MKmK5aXhAfmi9eMsDj9lxflMbjMYh J6ZZ4r8w==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1j2d21-0002Zj-9U; Fri, 14 Feb 2020 15:37:29 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1j2d14-0001gx-Qd for linux-arm-kernel@lists.infradead.org; Fri, 14 Feb 2020 15:36:33 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 5F8F311D4; Fri, 14 Feb 2020 07:36:30 -0800 (PST) Received: from e120937-lin.cambridge.arm.com (e120937-lin.cambridge.arm.com [10.1.197.50]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 603CB3F68E; Fri, 14 Feb 2020 07:36:29 -0800 (PST) From: Cristian Marussi To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [RFC PATCH v2 04/13] firmware: arm_scmi: Add support for notifications message processing Date: Fri, 14 Feb 2020 15:35:26 +0000 Message-Id: <20200214153535.32046-5-cristian.marussi@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200214153535.32046-1-cristian.marussi@arm.com> References: <20200214153535.32046-1-cristian.marussi@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200214_073630_990910_AFD82F3D X-CRM114-Status: GOOD ( 12.28 ) X-Spam-Score: -2.3 (--) X-Spam-Report: SpamAssassin version 3.4.3 on bombadil.infradead.org summary: Content analysis details: (-2.3 points) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at https://www.dnswl.org/, medium trust [217.140.110.172 listed in list.dnswl.org] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jonathan.Cameron@Huawei.com, cristian.marussi@arm.com, james.quinlan@broadcom.com, lukasz.luba@arm.com, sudeep.holla@arm.com MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org From: Sudeep Holla Add the mechanisms to distinguish notifications from delayed responses and to properly fetch notification messages upon reception: notifications processing does not continue further after the fetch phase. Signed-off-by: Sudeep Holla [Reworked/renamed scmi_handle_xfer_delayed_resp()] Signed-off-by: Cristian Marussi --- V1 --> V2 - switch the notif/delayed_resp message processing logic to use new transport independent layer methods - reviewed logic of scmi_handle_xfer_delayed_resp() while renaming it as scmi_handle_response() - properly relocated tracer points --- drivers/firmware/arm_scmi/driver.c | 84 +++++++++++++++++++++++------- 1 file changed, 64 insertions(+), 20 deletions(-) diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c index efb660c34b57..868cc36a07c9 100644 --- a/drivers/firmware/arm_scmi/driver.c +++ b/drivers/firmware/arm_scmi/driver.c @@ -202,29 +202,42 @@ __scmi_xfer_put(struct scmi_xfers_info *minfo, struct scmi_xfer *xfer) spin_unlock_irqrestore(&minfo->xfer_lock, flags); } -/** - * scmi_rx_callback() - callback for receiving messages - * - * @cinfo: SCMI channel info - * @msg_hdr: Message header - * - * Processes one received message to appropriate transfer information and - * signals completion of the transfer. - * - * NOTE: This function will be invoked in IRQ context, hence should be - * as optimal as possible. - */ -void scmi_rx_callback(struct scmi_chan_info *cinfo, u32 msg_hdr) +static void scmi_handle_notification(struct scmi_chan_info *cinfo, u32 msg_hdr) { - struct scmi_info *info = handle_to_scmi_info(cinfo->handle); - struct scmi_xfers_info *minfo = &info->tx_minfo; - u16 xfer_id = MSG_XTRACT_TOKEN(msg_hdr); - u8 msg_type = MSG_XTRACT_TYPE(msg_hdr); - struct device *dev = cinfo->dev; struct scmi_xfer *xfer; + struct device *dev = cinfo->dev; + struct scmi_info *info = handle_to_scmi_info(cinfo->handle); + struct scmi_xfers_info *minfo = &info->rx_minfo; + + xfer = scmi_xfer_get(cinfo->handle, minfo); + if (IS_ERR(xfer)) { + dev_err(dev, "failed to get free message slot (%ld)\n", + PTR_ERR(xfer)); + info->desc->ops->clear_notification(cinfo); + return; + } + + unpack_scmi_header(msg_hdr, &xfer->hdr); + scmi_dump_header_dbg(dev, &xfer->hdr); + info->desc->ops->fetch_notification(cinfo, info->desc->max_msg_size, + xfer); + + trace_scmi_rx_done(xfer->transfer_id, xfer->hdr.id, + xfer->hdr.protocol_id, xfer->hdr.seq, + MSG_TYPE_NOTIFICATION); - if (msg_type == MSG_TYPE_NOTIFICATION) - return; /* Notifications not yet supported */ + __scmi_xfer_put(minfo, xfer); + + info->desc->ops->clear_notification(cinfo); +} + +static void scmi_handle_response(struct scmi_chan_info *cinfo, + u16 xfer_id, u8 msg_type) +{ + struct scmi_xfer *xfer; + struct device *dev = cinfo->dev; + struct scmi_info *info = handle_to_scmi_info(cinfo->handle); + struct scmi_xfers_info *minfo = &info->tx_minfo; /* Are we even expecting this? */ if (!test_bit(xfer_id, minfo->xfer_alloc_table)) { @@ -248,6 +261,37 @@ void scmi_rx_callback(struct scmi_chan_info *cinfo, u32 msg_hdr) complete(&xfer->done); } +/** + * scmi_rx_callback() - callback for receiving messages + * + * @cinfo: SCMI channel info + * @msg_hdr: Message header + * + * Processes one received message to appropriate transfer information and + * signals completion of the transfer. + * + * NOTE: This function will be invoked in IRQ context, hence should be + * as optimal as possible. + */ +void scmi_rx_callback(struct scmi_chan_info *cinfo, u32 msg_hdr) +{ + u16 xfer_id = MSG_XTRACT_TOKEN(msg_hdr); + u8 msg_type = MSG_XTRACT_TYPE(msg_hdr); + + switch (msg_type) { + case MSG_TYPE_NOTIFICATION: + scmi_handle_notification(cinfo, msg_hdr); + break; + case MSG_TYPE_COMMAND: + case MSG_TYPE_DELAYED_RESP: + scmi_handle_response(cinfo, xfer_id, msg_type); + break; + default: + WARN_ONCE(1, "received unknown msg_type:%d\n", msg_type); + break; + } +} + /** * scmi_xfer_put() - Release a transmit message *