From: Linus Walleij <linus.walleij@linaro.org>
To: Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
Ming Lei <ming.lei@redhat.com>, Arnd Bergmann <arnd@arndb.de>,
Ulf Hansson <ulf.hansson@linaro.org>,
Nicolas Pitre <nico@fluxnic.net>,
Aaro Koskinen <aaro.koskinen@iki.fi>,
Adrian Hunter <adrian.hunter@intel.com>,
Angelo Dureghello <angelo.dureghello@timesys.com>
Cc: linux-mmc@vger.kernel.org, linux-block@vger.kernel.org,
linux-omap@vger.kernel.org,
Linus Walleij <linus.walleij@linaro.org>
Subject: [PATCH 2/7] mmc: moxart-mmc: Map the virtual page for PIO
Date: Thu, 25 Jan 2024 15:37:06 +0100 [thread overview]
Message-ID: <20240125-mmc-proper-kmap-v1-2-ba953c1ac3f9@linaro.org> (raw)
In-Reply-To: <20240125-mmc-proper-kmap-v1-0-ba953c1ac3f9@linaro.org>
Use kmap_local_page() instead of sg_virt() to obtain a page
from the scatterlist: sg_virt() will not perform bounce
buffering if the page happens to be located in high memory,
which the driver may or may not be using.
Suggested-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/linux-mmc/20240122073423.GA25859@lst.de/
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
drivers/mmc/host/moxart-mmc.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/host/moxart-mmc.c b/drivers/mmc/host/moxart-mmc.c
index 5cfdd3a86e54..7ccfe872415a 100644
--- a/drivers/mmc/host/moxart-mmc.c
+++ b/drivers/mmc/host/moxart-mmc.c
@@ -310,7 +310,7 @@ static void moxart_transfer_pio(struct moxart_host *host)
if (host->data_len == data->bytes_xfered)
return;
- sgp = sg_virt(host->cur_sg);
+ sgp = kmap_local_page(sg_page(host->cur_sg));
remain = host->data_remain;
if (data->flags & MMC_DATA_WRITE) {
@@ -346,6 +346,7 @@ static void moxart_transfer_pio(struct moxart_host *host)
}
}
+ kunmap_local(sgp);
data->bytes_xfered += host->data_remain - remain;
host->data_remain = remain;
--
2.34.1
next prev parent reply other threads:[~2024-01-25 14:37 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-25 14:37 [PATCH 0/7] mmc: Try to do proper kmap_local() for scatterlists Linus Walleij
2024-01-25 14:37 ` [PATCH 1/7] mmc: davinci_mmc: Map the virtual page for PIO Linus Walleij
2024-01-25 16:37 ` Arnd Bergmann
2024-01-25 23:18 ` Linus Walleij
2024-01-25 14:37 ` Linus Walleij [this message]
2024-01-25 14:37 ` [PATCH 3/7] mmc: mvsdio: " Linus Walleij
2024-01-25 14:37 ` [PATCH 4/7] mmc: mxcmmc: " Linus Walleij
2024-01-25 14:37 ` [PATCH 5/7] mmc: omap: " Linus Walleij
2024-01-25 14:37 ` [PATCH 6/7] mmc: sdhci-esdhc-mcf: Map the virtual page for swapping Linus Walleij
2024-01-25 14:37 ` [PATCH 7/7] mmc: sh_mmcif: Map the virtual page for PIO Linus Walleij
2024-02-13 16:45 ` [PATCH 0/7] mmc: Try to do proper kmap_local() for scatterlists Ulf Hansson
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