From patchwork Tue Sep 8 21:17:52 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Felix Fietkau X-Patchwork-Id: 259315 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=-12.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY,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 2DDFBC43461 for ; Tue, 8 Sep 2020 21:18:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EADF020768 for ; Tue, 8 Sep 2020 21:18:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=nbd.name header.i=@nbd.name header.b="jmGwG9BF" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729037AbgIHVST (ORCPT ); Tue, 8 Sep 2020 17:18:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48544 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730161AbgIHVSG (ORCPT ); Tue, 8 Sep 2020 17:18:06 -0400 Received: from nbd.name (nbd.name [IPv6:2a01:4f8:221:3d45::2]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 83099C061796 for ; Tue, 8 Sep 2020 14:18:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=nbd.name; s=20160729; h=Content-Transfer-Encoding:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Sender:Reply-To:Cc:Content-Type:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=XXxZBDhySO0WuRgLWpxJLdN3KEz/uNNbQLoP3xfQhlA=; b=jmGwG9BFNc3oKKpKASU3DsW1n/ /5r3f/Lo84hFfEQDwuteop4h8g3s4T1N1D523v/D6f03dVTbl0TJ6GD0jB2C/m/VuuUFg5lgOpcBt ngCDNoZ6x8941R+OAI49Blguqi4nakaaC5EH+3uitwfQGbVTmg/ROS3SxBEUssRa7NQ0=; Received: from p4ff13fcb.dip0.t-ipconnect.de ([79.241.63.203] helo=localhost.localdomain) by ds12 with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_CBC_SHA1:128) (Exim 4.89) (envelope-from ) id 1kFl03-0002Cx-8a for linux-wireless@vger.kernel.org; Tue, 08 Sep 2020 23:17:59 +0200 From: Felix Fietkau To: linux-wireless@vger.kernel.org Subject: [PATCH 07/11] mt76: dma: cache dma map address/len in struct mt76_queue_entry Date: Tue, 8 Sep 2020 23:17:52 +0200 Message-Id: <20200908211756.15998-7-nbd@nbd.name> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200908211756.15998-1-nbd@nbd.name> References: <20200908211756.15998-1-nbd@nbd.name> MIME-Version: 1.0 Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org Accessing them from uncached memory can be expensive, so it's cheaper to cache them Signed-off-by: Felix Fietkau --- drivers/net/wireless/mediatek/mt76/dma.c | 43 +++++++++++------------ drivers/net/wireless/mediatek/mt76/mt76.h | 2 ++ 2 files changed, 22 insertions(+), 23 deletions(-) diff --git a/drivers/net/wireless/mediatek/mt76/dma.c b/drivers/net/wireless/mediatek/mt76/dma.c index 7f669a2432a4..38cc40c99ba1 100644 --- a/drivers/net/wireless/mediatek/mt76/dma.c +++ b/drivers/net/wireless/mediatek/mt76/dma.c @@ -49,6 +49,7 @@ mt76_dma_add_buf(struct mt76_dev *dev, struct mt76_queue *q, struct mt76_queue_buf *buf, int nbufs, u32 info, struct sk_buff *skb, void *txwi) { + struct mt76_queue_entry *entry; struct mt76_desc *desc; u32 ctrl; int i, idx = -1; @@ -61,16 +62,27 @@ mt76_dma_add_buf(struct mt76_dev *dev, struct mt76_queue *q, for (i = 0; i < nbufs; i += 2, buf += 2) { u32 buf0 = buf[0].addr, buf1 = 0; + idx = q->head; + q->head = (q->head + 1) % q->ndesc; + + desc = &q->desc[idx]; + entry = &q->entry[idx]; + if (buf[0].skip_unmap) - q->entry[q->head].skip_buf0 = true; - q->entry[q->head].skip_buf1 = i == nbufs - 1; + entry->skip_buf0 = true; + entry->skip_buf1 = i == nbufs - 1; + + entry->dma_addr[0] = buf[0].addr; + entry->dma_len[0] = buf[0].len; ctrl = FIELD_PREP(MT_DMA_CTL_SD_LEN0, buf[0].len); if (i < nbufs - 1) { + entry->dma_addr[1] = buf[1].addr; + entry->dma_len[1] = buf[1].len; buf1 = buf[1].addr; ctrl |= FIELD_PREP(MT_DMA_CTL_SD_LEN1, buf[1].len); if (buf[1].skip_unmap) - q->entry[q->head].skip_buf1 = true; + entry->skip_buf1 = true; } if (i == nbufs - 1) @@ -78,11 +90,6 @@ mt76_dma_add_buf(struct mt76_dev *dev, struct mt76_queue *q, else if (i == nbufs - 2) ctrl |= MT_DMA_CTL_LAST_SEC1; - idx = q->head; - q->head = (q->head + 1) % q->ndesc; - - desc = &q->desc[idx]; - WRITE_ONCE(desc->buf0, cpu_to_le32(buf0)); WRITE_ONCE(desc->buf1, cpu_to_le32(buf1)); WRITE_ONCE(desc->info, cpu_to_le32(info)); @@ -102,24 +109,14 @@ mt76_dma_tx_cleanup_idx(struct mt76_dev *dev, struct mt76_queue *q, int idx, struct mt76_queue_entry *prev_e) { struct mt76_queue_entry *e = &q->entry[idx]; - __le32 __ctrl = READ_ONCE(q->desc[idx].ctrl); - u32 ctrl = le32_to_cpu(__ctrl); - - if (!e->skip_buf0) { - __le32 addr = READ_ONCE(q->desc[idx].buf0); - u32 len = FIELD_GET(MT_DMA_CTL_SD_LEN0, ctrl); - dma_unmap_single(dev->dev, le32_to_cpu(addr), len, + if (!e->skip_buf0) + dma_unmap_single(dev->dev, e->dma_addr[0], e->dma_len[0], DMA_TO_DEVICE); - } - - if (!e->skip_buf1) { - __le32 addr = READ_ONCE(q->desc[idx].buf1); - u32 len = FIELD_GET(MT_DMA_CTL_SD_LEN1, ctrl); - dma_unmap_single(dev->dev, le32_to_cpu(addr), len, + if (!e->skip_buf1) + dma_unmap_single(dev->dev, e->dma_addr[1], e->dma_len[1], DMA_TO_DEVICE); - } if (e->txwi == DMA_DUMMY_DATA) e->txwi = NULL; @@ -207,7 +204,7 @@ mt76_dma_get_buf(struct mt76_dev *dev, struct mt76_queue *q, int idx, void *buf = e->buf; int buf_len = SKB_WITH_OVERHEAD(q->buf_size); - buf_addr = le32_to_cpu(READ_ONCE(desc->buf0)); + buf_addr = e->dma_addr[0]; if (len) { u32 ctl = le32_to_cpu(READ_ONCE(desc->ctrl)); *len = FIELD_GET(MT_DMA_CTL_SD_LEN0, ctl); diff --git a/drivers/net/wireless/mediatek/mt76/mt76.h b/drivers/net/wireless/mediatek/mt76/mt76.h index 2d44fe522ade..9dbb7dd65d23 100644 --- a/drivers/net/wireless/mediatek/mt76/mt76.h +++ b/drivers/net/wireless/mediatek/mt76/mt76.h @@ -102,6 +102,8 @@ struct mt76_queue_entry { struct urb *urb; int buf_sz; }; + u32 dma_addr[2]; + u16 dma_len[2]; u16 wcid; bool skip_buf0:1; bool skip_buf1:1;