From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
To: Wolfram Sang <wsa@the-dreams.de>
Cc: "axboe@kernel.dk" <axboe@kernel.dk>,
"linux-renesas-soc@vger.kernel.org"
<linux-renesas-soc@vger.kernel.org>,
"ulf.hansson@linaro.org" <ulf.hansson@linaro.org>,
"linux-mmc@vger.kernel.org" <linux-mmc@vger.kernel.org>,
"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
"wsa+renesas@sang-engineering.com"
<wsa+renesas@sang-engineering.com>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>, "hch@lst.de" <hch@lst.de>
Subject: RE: [RFC PATCH v6 5/5] mmc: queue: Use bigger segments if IOMMU can merge the segments
Date: Mon, 17 Jun 2019 06:38:13 +0000 [thread overview]
Message-ID: <OSBPR01MB35904746C1E9CEF1C404ED9FD8EB0@OSBPR01MB3590.jpnprd01.prod.outlook.com> (raw)
In-Reply-To: <20190613195839.GE6863@kunai>
Hi Wolfram-san,
> From: Wolfram Sang, Sent: Friday, June 14, 2019 4:59 AM
>
> > - blk_queue_max_segments(mq->queue, host->max_segs);
> > + /* blk_queue_can_use_iommu_merging() should succeed if can_merge = 1 */
> > + if (host->can_merge &&
> > + !blk_queue_can_use_iommu_merging(mq->queue, mmc_dev(host)))
> > + WARN_ON(1);
> > + blk_queue_max_segments(mq->queue, mmc_get_max_segments(host));
>
> Maybe we could use WARN here to save the comment and move the info to
> the printout?
>
> - blk_queue_max_segments(mq->queue, host->max_segs);
> + if (host->can_merge)
> + WARN(!blk_queue_can_use_iommu_merging(mq->queue, mmc_dev(host)),
> + "merging was advertised but not possible\n");
> + blk_queue_max_segments(mq->queue, mmc_get_max_segments(host));
Thank you for the suggestion. It's a good idea! I'll fix the patch.
Best regards,
Yoshihiro Shimoda
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next prev parent reply other threads:[~2019-06-17 6:38 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-13 10:20 [RFC PATCH v6 0/5] treewide: improve R-Car SDHI performance Yoshihiro Shimoda
2019-06-13 10:20 ` [RFC PATCH v6 1/5] iommu: add an exported function to get minimum page size for a domain Yoshihiro Shimoda
2019-06-13 19:37 ` Wolfram Sang
2019-06-14 7:16 ` Christoph Hellwig
2019-06-17 5:08 ` Yoshihiro Shimoda
2019-06-14 9:41 ` Robin Murphy
2019-06-17 5:23 ` Yoshihiro Shimoda
2019-06-13 10:20 ` [RFC PATCH v6 2/5] block: sort headers on blk-setting.c Yoshihiro Shimoda
2019-06-13 19:40 ` Wolfram Sang
2019-06-13 10:20 ` [RFC PATCH v6 3/5] block: add a helper function to merge the segments by an IOMMU Yoshihiro Shimoda
2019-06-14 7:22 ` Christoph Hellwig
2019-06-14 9:54 ` Robin Murphy
2019-06-17 6:29 ` Yoshihiro Shimoda
2019-06-13 10:20 ` [RFC PATCH v6 4/5] mmc: tmio: Use dma_max_mapping_size() instead of a workaround Yoshihiro Shimoda
2019-06-13 19:45 ` Wolfram Sang
2019-06-17 4:25 ` Yoshihiro Shimoda
2019-06-13 20:35 ` Geert Uytterhoeven
2019-06-14 7:18 ` Christoph Hellwig
2019-06-14 7:27 ` Geert Uytterhoeven
2019-06-17 4:54 ` Yoshihiro Shimoda
2019-06-17 6:23 ` Geert Uytterhoeven
2019-06-17 6:54 ` Yoshihiro Shimoda
2019-06-13 10:20 ` [RFC PATCH v6 5/5] mmc: queue: Use bigger segments if IOMMU can merge the segments Yoshihiro Shimoda
2019-06-13 19:58 ` Wolfram Sang
2019-06-17 6:38 ` Yoshihiro Shimoda [this message]
2019-06-14 7:24 ` Christoph Hellwig
2019-06-14 10:42 ` Wolfram Sang
2019-06-17 6:46 ` Yoshihiro Shimoda
2019-06-17 6:53 ` Christoph Hellwig
2019-06-17 7:02 ` Yoshihiro Shimoda
2019-06-13 19:36 ` [RFC PATCH v6 0/5] treewide: improve R-Car SDHI performance Wolfram Sang
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