From patchwork Wed Sep 18 10:18:17 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dongsheng Yang X-Patchwork-Id: 13806777 Received: from out-189.mta1.migadu.com (out-189.mta1.migadu.com [95.215.58.189]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6C9E517D8A9 for ; Wed, 18 Sep 2024 10:19:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.189 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726654745; cv=none; b=DJwCBjtrXDs11VBYDzeSyzW1+k+sdwX68NTVn3MHkkaUcZE5yhGvyFNsMOyNjpmpf0vKW5Gh+R4gFsElt7aNHJJWoXzl7bXwmD7hp3ZTchKVF0HBJA9DGfY6FStVfogGNoOKa4jBxBf08lSAUOOCr46tS5WcqlhUlifX+nd41AQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726654745; c=relaxed/simple; bh=x5+e2My5BaOPTgvmct8wXbL95aiKhPSe+IaPqvjgdVY=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=j95N3Dbi/0Bb90+E/ISzSbQp8SD9VL8OtNqg9fpcGclhSGqBu/4jr9Fn4Wr0QGCAbjhW7L2soHHcBhP30ao5L94uG9rgvIa+jMyI5iGSYguafMjjigf64KsouPkDHhwc6iX7X8/AFSpuz+w+7fmrHqAtqCj+JVOkXp4CGHlSjp4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=hSi2M9QR; arc=none smtp.client-ip=95.215.58.189 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="hSi2M9QR" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1726654740; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=fyUBo72TgIvtSI2EW8Tbo6F1BzZphxvwxeH+Ee3WF98=; b=hSi2M9QReCJagBh+7SIts1zSjZpPlbxhx9lBEeUYTtaQ+fPrsTEP7FfTIQOMTMBO/UnQbb 6lSEevSb7EC8w9Qkd/TyDYHC3ImN1H9rDZaN0dGauepTZgYDO01ZBpVbHtPVqLWovGvqfW h9eOIBrYJBFMqaYXA1cq25raQD2Oa48= From: Dongsheng Yang To: axboe@kernel.dk, dan.j.williams@intel.com, gregory.price@memverge.com, John@groves.net, Jonathan.Cameron@Huawei.com, bbhushan2@marvell.com, chaitanyak@nvidia.com, rdunlap@infradead.org Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-cxl@vger.kernel.org, linux-bcache@vger.kernel.org, Dongsheng Yang Subject: [PATCH v2 4/8] cbd: introduce cbd_channel Date: Wed, 18 Sep 2024 10:18:17 +0000 Message-Id: <20240918101821.681118-5-dongsheng.yang@linux.dev> In-Reply-To: <20240918101821.681118-1-dongsheng.yang@linux.dev> References: <20240918101821.681118-1-dongsheng.yang@linux.dev> Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT The "cbd_channel" is the component responsible for the interaction between the blkdev and the backend. It mainly provides the functions "cbdc_copy_to_bio", "cbdc_copy_from_bio" and "cbd_channel_crc" If the blkdev or backend is alive, that means there is active user for this channel, then channel is alive. Signed-off-by: Dongsheng Yang --- drivers/block/cbd/cbd_channel.c | 96 +++++++++++++++++++++++++++++++++ 1 file changed, 96 insertions(+) create mode 100644 drivers/block/cbd/cbd_channel.c diff --git a/drivers/block/cbd/cbd_channel.c b/drivers/block/cbd/cbd_channel.c new file mode 100644 index 000000000000..6d3f77b9dc79 --- /dev/null +++ b/drivers/block/cbd/cbd_channel.c @@ -0,0 +1,96 @@ +#include "cbd_internal.h" + +static void channel_format(struct cbd_transport *cbdt, u32 id) +{ + struct cbd_channel_info *channel_info = cbdt_get_channel_info(cbdt, id); + + cbdt_zero_range(cbdt, channel_info, CBDC_META_SIZE); +} + +int cbd_get_empty_channel_id(struct cbd_transport *cbdt, u32 *id) +{ + int ret; + + ret = cbdt_get_empty_segment_id(cbdt, id); + if (ret) + return ret; + + channel_format(cbdt, *id); + + return 0; +} + +void cbdc_copy_to_bio(struct cbd_channel *channel, + u32 data_off, u32 data_len, struct bio *bio, u32 bio_off) +{ + cbds_copy_to_bio(&channel->segment, data_off, data_len, bio, bio_off); +} + +void cbdc_copy_from_bio(struct cbd_channel *channel, + u32 data_off, u32 data_len, struct bio *bio, u32 bio_off) +{ + cbds_copy_from_bio(&channel->segment, data_off, data_len, bio, bio_off); +} + +u32 cbd_channel_crc(struct cbd_channel *channel, u32 data_off, u32 data_len) +{ + return cbd_seg_crc(&channel->segment, data_off, data_len); +} + + +int cbdc_map_pages(struct cbd_channel *channel, struct cbd_backend_io *io) +{ + return cbds_map_pages(&channel->segment, io); +} + +ssize_t cbd_channel_seg_detail_show(struct cbd_channel_info *channel_info, char *buf) +{ + return sprintf(buf, "channel backend id: %u\n" + "channel blkdev id: %u\n", + channel_info->backend_id, + channel_info->blkdev_id); +} + +static void cbd_channel_seg_sanitize_pos(struct cbd_seg_pos *pos) +{ + struct cbd_segment *segment = pos->segment; + + /* channel only use one segment as a ring */ + while (pos->off >= segment->data_size) + pos->off -= segment->data_size; +} + +static struct cbd_seg_ops cbd_channel_seg_ops = { + .sanitize_pos = cbd_channel_seg_sanitize_pos +}; + +void cbd_channel_init(struct cbd_channel *channel, struct cbd_transport *cbdt, u32 seg_id) +{ + struct cbd_channel_info *channel_info = cbdt_get_channel_info(cbdt, seg_id); + struct cbd_segment *segment = &channel->segment; + struct cbds_init_options seg_options; + + seg_options.seg_id = seg_id; + seg_options.type = cbds_type_channel; + seg_options.data_off = CBDC_DATA_OFF; + seg_options.seg_ops = &cbd_channel_seg_ops; + + cbd_segment_init(cbdt, segment, &seg_options); + + channel->cbdt = cbdt; + channel->channel_info = channel_info; + channel->seg_id = seg_id; + channel->submr = (void *)channel_info + CBDC_SUBMR_OFF; + channel->compr = (void *)channel_info + CBDC_COMPR_OFF; + channel->submr_size = rounddown(CBDC_SUBMR_SIZE, sizeof(struct cbd_se)); + channel->compr_size = rounddown(CBDC_COMPR_SIZE, sizeof(struct cbd_ce)); + channel->data_size = CBDC_DATA_SIZE; + + spin_lock_init(&channel->submr_lock); + spin_lock_init(&channel->compr_lock); +} + +void cbd_channel_exit(struct cbd_channel *channel) +{ + cbd_segment_exit(&channel->segment); +}