From patchwork Tue Feb 9 19:29:48 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Mark Cave-Ayland X-Patchwork-Id: 12078997 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 29651C433DB for ; Tue, 9 Feb 2021 19:44:14 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 812F964EDC for ; Tue, 9 Feb 2021 19:44:13 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 812F964EDC Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ilande.co.uk Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:54420 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1l9Yvk-0002Hf-98 for qemu-devel@archiver.kernel.org; Tue, 09 Feb 2021 14:44:12 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:57464) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1l9YjT-0004ap-Ek for qemu-devel@nongnu.org; Tue, 09 Feb 2021 14:31:31 -0500 Received: from mail.ilande.co.uk ([2001:41c9:1:41f::167]:56848 helo=mail.default.ilande.uk0.bigv.io) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1l9YjR-0002N6-SY for qemu-devel@nongnu.org; Tue, 09 Feb 2021 14:31:31 -0500 Received: from host109-153-84-1.range109-153.btcentralplus.com ([109.153.84.1] helo=kentang.home) by mail.default.ilande.uk0.bigv.io with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1l9Yjk-0007pt-O3; Tue, 09 Feb 2021 19:31:53 +0000 From: Mark Cave-Ayland To: qemu-devel@nongnu.org, pbonzini@redhat.com, fam@euphon.net, laurent@vivier.eu Date: Tue, 9 Feb 2021 19:29:48 +0000 Message-Id: <20210209193018.31339-13-mark.cave-ayland@ilande.co.uk> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210209193018.31339-1-mark.cave-ayland@ilande.co.uk> References: <20210209193018.31339-1-mark.cave-ayland@ilande.co.uk> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 109.153.84.1 X-SA-Exim-Mail-From: mark.cave-ayland@ilande.co.uk Subject: [PATCH v2 12/42] esp: remove dma_counter from ESPState X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on mail.default.ilande.uk0.bigv.io) Received-SPF: pass client-ip=2001:41c9:1:41f::167; envelope-from=mark.cave-ayland@ilande.co.uk; helo=mail.default.ilande.uk0.bigv.io X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" The value of dma_counter is set once at the start of the transfer and remains the same until the transfer is complete. This allows the check in esp_transfer_data to be simplified since dma_left will always be non-zero until the transfer is completed. Signed-off-by: Mark Cave-Ayland Reviewed-by: Philippe Mathieu-Daudé Reviewed-by: Laurent Vivier --- hw/scsi/esp.c | 4 +--- include/hw/scsi/esp.h | 3 --- 2 files changed, 1 insertion(+), 6 deletions(-) diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c index 02b7876394..6c495b29c0 100644 --- a/hw/scsi/esp.c +++ b/hw/scsi/esp.c @@ -229,7 +229,6 @@ static void do_busid_cmd(ESPState *s, uint8_t *buf, uint8_t busid) if (datalen != 0) { s->rregs[ESP_RSTAT] = STAT_TC; s->dma_left = 0; - s->dma_counter = 0; if (datalen > 0) { s->rregs[ESP_RSTAT] |= STAT_DI; } else { @@ -543,7 +542,7 @@ void esp_transfer_data(SCSIRequest *req, uint32_t len) s->async_buf = scsi_req_get_buf(req); if (s->dma_left) { esp_do_dma(s); - } else if (s->dma_counter != 0 && s->ti_size <= 0) { + } else if (s->ti_size <= 0) { /* * If this was the last part of a DMA transfer then the * completion interrupt is deferred to here. @@ -562,7 +561,6 @@ static void handle_ti(ESPState *s) } dmalen = esp_get_tc(s); - s->dma_counter = dmalen; if (s->do_cmd) { minlen = (dmalen < ESP_CMDBUF_SZ) ? dmalen : ESP_CMDBUF_SZ; diff --git a/include/hw/scsi/esp.h b/include/hw/scsi/esp.h index 7d92471c5b..b313ef27f2 100644 --- a/include/hw/scsi/esp.h +++ b/include/hw/scsi/esp.h @@ -50,9 +50,6 @@ struct ESPState { /* The amount of data left in the current DMA transfer. */ uint32_t dma_left; - /* The size of the current DMA transfer. Zero if no transfer is in - progress. */ - uint32_t dma_counter; int dma_enabled; uint32_t async_len;