From patchwork Wed Dec 14 23:52:57 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Serge Semin X-Patchwork-Id: 13073790 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 EF303C001B2 for ; Wed, 14 Dec 2022 23:53:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229964AbiLNXxo (ORCPT ); Wed, 14 Dec 2022 18:53:44 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44222 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229763AbiLNXxV (ORCPT ); Wed, 14 Dec 2022 18:53:21 -0500 Received: from post.baikalelectronics.com (post.baikalelectronics.com [213.79.110.86]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 898964B983; Wed, 14 Dec 2022 15:53:20 -0800 (PST) Received: from post.baikalelectronics.com (localhost.localdomain [127.0.0.1]) by post.baikalelectronics.com (Proxmox) with ESMTP id 2B3F1E0ECE; Thu, 15 Dec 2022 02:53:20 +0300 (MSK) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= baikalelectronics.ru; h=cc:cc:content-transfer-encoding :content-type:content-type:date:from:from:in-reply-to:message-id :mime-version:references:reply-to:subject:subject:to:to; s=post; bh=re+3k6qVc+WxjPUqvBTpgGdDrYCaj1K6BxG1UdQ+D7g=; b=aCH/BDP4dCaW PwIvurOM7Ntvea4Bjj5hiCcCb/nxVdIMrEqEWyW3WffvDHXQQlOxNwRLWuAC97T5 dd5IOKeL26Gs2LuRNn2i9L/WgCwCphsVFMT4Nbpn8zZVOPmRKo2uKk0GJvt6oXRt kaQVj8TP2f7xj6gzN67B/LTm8B350QI= Received: from mail.baikal.int (mail.baikal.int [192.168.51.25]) by post.baikalelectronics.com (Proxmox) with ESMTP id 1DAEEE0E6B; Thu, 15 Dec 2022 02:53:20 +0300 (MSK) Received: from localhost (10.8.30.6) by mail (192.168.51.25) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Thu, 15 Dec 2022 02:53:19 +0300 From: Serge Semin To: Gustavo Pimentel , Vinod Koul , Rob Herring , Bjorn Helgaas , Lorenzo Pieralisi , Cai Huoqing , Robin Murphy , Jingoo Han , Frank Li , Manivannan Sadhasivam CC: Serge Semin , Serge Semin , Alexey Malahov , Pavel Parkhomenko , =?utf-8?q?Krzys?= =?utf-8?q?ztof_Wilczy=C5=84ski?= , caihuoqing , Yoshihiro Shimoda , , , Subject: [PATCH v7 17/25] dmaengine: dw-edma: Join Write/Read channels into a single device Date: Thu, 15 Dec 2022 02:52:57 +0300 Message-ID: <20221214235305.31744-18-Sergey.Semin@baikalelectronics.ru> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221214235305.31744-1-Sergey.Semin@baikalelectronics.ru> References: <20221214235305.31744-1-Sergey.Semin@baikalelectronics.ru> MIME-Version: 1.0 X-Originating-IP: [10.8.30.6] X-ClientProxiedBy: MAIL.baikal.int (192.168.51.25) To mail (192.168.51.25) Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Indeed there is no point in such split up because due to multiple reasons. First of all eDMA read and write channels belong to one physical controller. Splitting them up illogical. Secondly the channels differentiating can be done by means of the filtering and the dma_get_slave_caps() method. Finally having these channels handled separately not only needlessly complicates the code, but also causes the DebugFS error printed to console: >> Debugfs: Directory '1f052000.pcie' with parent 'dmaengine' already present! So to speak let's join the read/write channels into a single DMA device. The client drivers will be able to choose the channel with required capability by getting the DMA slave direction setting. It's default value is overridden by the dw_edma_device_caps() callback in accordance with the channel nature. Signed-off-by: Serge Semin Reviewed-by: Manivannan Sadhasivam Tested-by: Manivannan Sadhasivam Acked-by: Vinod Koul --- drivers/dma/dw-edma/dw-edma-core.c | 116 +++++++++++++++-------------- drivers/dma/dw-edma/dw-edma-core.h | 5 +- 2 files changed, 61 insertions(+), 60 deletions(-) diff --git a/drivers/dma/dw-edma/dw-edma-core.c b/drivers/dma/dw-edma/dw-edma-core.c index ecd3e8f7ac5d..c3ecae4287d0 100644 --- a/drivers/dma/dw-edma/dw-edma-core.c +++ b/drivers/dma/dw-edma/dw-edma-core.c @@ -208,6 +208,24 @@ static void dw_edma_start_transfer(struct dw_edma_chan *chan) desc->chunks_alloc--; } +static void dw_edma_device_caps(struct dma_chan *dchan, + struct dma_slave_caps *caps) +{ + struct dw_edma_chan *chan = dchan2dw_edma_chan(dchan); + + if (chan->dw->chip->flags & DW_EDMA_CHIP_LOCAL) { + if (chan->dir == EDMA_DIR_READ) + caps->directions = BIT(DMA_DEV_TO_MEM); + else + caps->directions = BIT(DMA_MEM_TO_DEV); + } else { + if (chan->dir == EDMA_DIR_WRITE) + caps->directions = BIT(DMA_DEV_TO_MEM); + else + caps->directions = BIT(DMA_MEM_TO_DEV); + } +} + static int dw_edma_device_config(struct dma_chan *dchan, struct dma_slave_config *config) { @@ -717,8 +735,7 @@ static void dw_edma_free_chan_resources(struct dma_chan *dchan) } } -static int dw_edma_channel_setup(struct dw_edma *dw, bool write, - u32 wr_alloc, u32 rd_alloc) +static int dw_edma_channel_setup(struct dw_edma *dw, u32 wr_alloc, u32 rd_alloc) { struct dw_edma_chip *chip = dw->chip; struct dw_edma_region *dt_region; @@ -726,27 +743,15 @@ static int dw_edma_channel_setup(struct dw_edma *dw, bool write, struct dw_edma_chan *chan; struct dw_edma_irq *irq; struct dma_device *dma; - u32 alloc, off_alloc; - u32 i, j, cnt; - int err = 0; + u32 i, ch_cnt; u32 pos; - if (write) { - i = 0; - cnt = dw->wr_ch_cnt; - dma = &dw->wr_edma; - alloc = wr_alloc; - off_alloc = 0; - } else { - i = dw->wr_ch_cnt; - cnt = dw->rd_ch_cnt; - dma = &dw->rd_edma; - alloc = rd_alloc; - off_alloc = wr_alloc; - } + ch_cnt = dw->wr_ch_cnt + dw->rd_ch_cnt; + dma = &dw->dma; INIT_LIST_HEAD(&dma->channels); - for (j = 0; (alloc || dw->nr_irqs == 1) && j < cnt; j++, i++) { + + for (i = 0; i < ch_cnt; i++) { chan = &dw->chan[i]; dt_region = devm_kzalloc(dev, sizeof(*dt_region), GFP_KERNEL); @@ -756,52 +761,62 @@ static int dw_edma_channel_setup(struct dw_edma *dw, bool write, chan->vc.chan.private = dt_region; chan->dw = dw; - chan->id = j; - chan->dir = write ? EDMA_DIR_WRITE : EDMA_DIR_READ; + + if (i < dw->wr_ch_cnt) { + chan->id = i; + chan->dir = EDMA_DIR_WRITE; + } else { + chan->id = i - dw->wr_ch_cnt; + chan->dir = EDMA_DIR_READ; + } + chan->configured = false; chan->request = EDMA_REQ_NONE; chan->status = EDMA_ST_IDLE; - if (write) - chan->ll_max = (chip->ll_region_wr[j].sz / EDMA_LL_SZ); + if (chan->dir == EDMA_DIR_WRITE) + chan->ll_max = (chip->ll_region_wr[chan->id].sz / EDMA_LL_SZ); else - chan->ll_max = (chip->ll_region_rd[j].sz / EDMA_LL_SZ); + chan->ll_max = (chip->ll_region_rd[chan->id].sz / EDMA_LL_SZ); chan->ll_max -= 1; dev_vdbg(dev, "L. List:\tChannel %s[%u] max_cnt=%u\n", - write ? "write" : "read", j, chan->ll_max); + chan->dir == EDMA_DIR_WRITE ? "write" : "read", + chan->id, chan->ll_max); if (dw->nr_irqs == 1) pos = 0; + else if (chan->dir == EDMA_DIR_WRITE) + pos = chan->id % wr_alloc; else - pos = off_alloc + (j % alloc); + pos = wr_alloc + chan->id % rd_alloc; irq = &dw->irq[pos]; - if (write) - irq->wr_mask |= BIT(j); + if (chan->dir == EDMA_DIR_WRITE) + irq->wr_mask |= BIT(chan->id); else - irq->rd_mask |= BIT(j); + irq->rd_mask |= BIT(chan->id); irq->dw = dw; memcpy(&chan->msi, &irq->msi, sizeof(chan->msi)); dev_vdbg(dev, "MSI:\t\tChannel %s[%u] addr=0x%.8x%.8x, data=0x%.8x\n", - write ? "write" : "read", j, + chan->dir == EDMA_DIR_WRITE ? "write" : "read", chan->id, chan->msi.address_hi, chan->msi.address_lo, chan->msi.data); chan->vc.desc_free = vchan_free_desc; vchan_init(&chan->vc, dma); - if (write) { - dt_region->paddr = chip->dt_region_wr[j].paddr; - dt_region->vaddr = chip->dt_region_wr[j].vaddr; - dt_region->sz = chip->dt_region_wr[j].sz; + if (chan->dir == EDMA_DIR_WRITE) { + dt_region->paddr = chip->dt_region_wr[chan->id].paddr; + dt_region->vaddr = chip->dt_region_wr[chan->id].vaddr; + dt_region->sz = chip->dt_region_wr[chan->id].sz; } else { - dt_region->paddr = chip->dt_region_rd[j].paddr; - dt_region->vaddr = chip->dt_region_rd[j].vaddr; - dt_region->sz = chip->dt_region_rd[j].sz; + dt_region->paddr = chip->dt_region_rd[chan->id].paddr; + dt_region->vaddr = chip->dt_region_rd[chan->id].vaddr; + dt_region->sz = chip->dt_region_rd[chan->id].sz; } dw_edma_v0_core_device_config(chan); @@ -813,7 +828,7 @@ static int dw_edma_channel_setup(struct dw_edma *dw, bool write, dma_cap_set(DMA_CYCLIC, dma->cap_mask); dma_cap_set(DMA_PRIVATE, dma->cap_mask); dma_cap_set(DMA_INTERLEAVE, dma->cap_mask); - dma->directions = BIT(write ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV); + dma->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); dma->src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES); dma->dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES); dma->residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR; @@ -822,6 +837,7 @@ static int dw_edma_channel_setup(struct dw_edma *dw, bool write, dma->dev = chip->dev; dma->device_alloc_chan_resources = dw_edma_alloc_chan_resources; dma->device_free_chan_resources = dw_edma_free_chan_resources; + dma->device_caps = dw_edma_device_caps; dma->device_config = dw_edma_device_config; dma->device_pause = dw_edma_device_pause; dma->device_resume = dw_edma_device_resume; @@ -835,9 +851,7 @@ static int dw_edma_channel_setup(struct dw_edma *dw, bool write, dma_set_max_seg_size(dma->dev, U32_MAX); /* Register DMA device */ - err = dma_async_device_register(dma); - - return err; + return dma_async_device_register(dma); } static inline void dw_edma_dec_irq_alloc(int *nr_irqs, u32 *alloc, u16 cnt) @@ -982,13 +996,8 @@ int dw_edma_probe(struct dw_edma_chip *chip) if (err) return err; - /* Setup write channels */ - err = dw_edma_channel_setup(dw, true, wr_alloc, rd_alloc); - if (err) - goto err_irq_free; - - /* Setup read channels */ - err = dw_edma_channel_setup(dw, false, wr_alloc, rd_alloc); + /* Setup write/read channels */ + err = dw_edma_channel_setup(dw, wr_alloc, rd_alloc); if (err) goto err_irq_free; @@ -1022,15 +1031,8 @@ int dw_edma_remove(struct dw_edma_chip *chip) free_irq(chip->ops->irq_vector(dev, i), &dw->irq[i]); /* Deregister eDMA device */ - dma_async_device_unregister(&dw->wr_edma); - list_for_each_entry_safe(chan, _chan, &dw->wr_edma.channels, - vc.chan.device_node) { - tasklet_kill(&chan->vc.task); - list_del(&chan->vc.chan.device_node); - } - - dma_async_device_unregister(&dw->rd_edma); - list_for_each_entry_safe(chan, _chan, &dw->rd_edma.channels, + dma_async_device_unregister(&dw->dma); + list_for_each_entry_safe(chan, _chan, &dw->dma.channels, vc.chan.device_node) { tasklet_kill(&chan->vc.task); list_del(&chan->vc.chan.device_node); diff --git a/drivers/dma/dw-edma/dw-edma-core.h b/drivers/dma/dw-edma/dw-edma-core.h index 85df2d511907..b576a8fff45a 100644 --- a/drivers/dma/dw-edma/dw-edma-core.h +++ b/drivers/dma/dw-edma/dw-edma-core.h @@ -98,10 +98,9 @@ struct dw_edma_irq { struct dw_edma { char name[20]; - struct dma_device wr_edma; - u16 wr_ch_cnt; + struct dma_device dma; - struct dma_device rd_edma; + u16 wr_ch_cnt; u16 rd_ch_cnt; struct dw_edma_irq *irq;