From: Christoph Hellwig <hch@lst.de>
To: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Aaro Koskinen <aaro.koskinen@iki.fi>,
Nicolas Pitre <nico@fluxnic.net>,
linux-mmc@vger.kernel.org, Russell King <linux@armlinux.org.uk>,
linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
Ben Dooks <ben-linux@fluff.org>,
linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Subject: [PATCH 11/14] mmc: sh_mmcif: handle highmem pages
Date: Tue, 12 Feb 2019 08:25:25 +0100
Message-ID: <20190212072528.13167-12-hch@lst.de> (raw)
In-Reply-To: <20190212072528.13167-1-hch@lst.de>
Instead of setting up a kernel pointer to track the current PIO address,
track the offset in the current page, and do an atomic kmap for the page
while doing the actual PIO operations.
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
drivers/mmc/host/sh_mmcif.c | 59 +++++++++++++++++++++++--------------
1 file changed, 37 insertions(+), 22 deletions(-)
diff --git a/drivers/mmc/host/sh_mmcif.c b/drivers/mmc/host/sh_mmcif.c
index 81bd9afb0980..24c3f13bafdb 100644
--- a/drivers/mmc/host/sh_mmcif.c
+++ b/drivers/mmc/host/sh_mmcif.c
@@ -228,7 +228,7 @@ struct sh_mmcif_host {
bool dying;
long timeout;
void __iomem *addr;
- u32 *pio_ptr;
+ u32 pio_offset;
spinlock_t lock; /* protect sh_mmcif_host::state */
enum sh_mmcif_state state;
enum sh_mmcif_wait_for wait_for;
@@ -595,7 +595,7 @@ static int sh_mmcif_error_manage(struct sh_mmcif_host *host)
return ret;
}
-static bool sh_mmcif_next_block(struct sh_mmcif_host *host, u32 *p)
+static bool sh_mmcif_next_block(struct sh_mmcif_host *host)
{
struct mmc_data *data = host->mrq->data;
@@ -606,10 +606,10 @@ static bool sh_mmcif_next_block(struct sh_mmcif_host *host, u32 *p)
if (host->sg_blkidx == data->sg->length) {
host->sg_blkidx = 0;
- if (++host->sg_idx < data->sg_len)
- host->pio_ptr = sg_virt(++data->sg);
- } else {
- host->pio_ptr = p;
+ if (++host->sg_idx < data->sg_len) {
+ data->sg++;
+ host->pio_offset = data->sg->offset / 4;
+ }
}
return host->sg_idx != data->sg_len;
@@ -631,8 +631,8 @@ static bool sh_mmcif_read_block(struct sh_mmcif_host *host)
{
struct device *dev = sh_mmcif_host_to_dev(host);
struct mmc_data *data = host->mrq->data;
- u32 *p = sg_virt(data->sg);
- int i;
+ u32 *p;
+ int off, i;
if (host->sd_error) {
data->error = sh_mmcif_error_manage(host);
@@ -640,8 +640,11 @@ static bool sh_mmcif_read_block(struct sh_mmcif_host *host)
return false;
}
+ p = sg_kmap_atomic(data->sg);
+ off = data->sg->offset / 4;
for (i = 0; i < host->blocksize / 4; i++)
- *p++ = sh_mmcif_readl(host->addr, MMCIF_CE_DATA);
+ p[off++] = sh_mmcif_readl(host->addr, MMCIF_CE_DATA);
+ sg_kunmap_atomic(data->sg, p);
/* buffer read end */
sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFRE);
@@ -664,7 +667,7 @@ static void sh_mmcif_multi_read(struct sh_mmcif_host *host,
host->wait_for = MMCIF_WAIT_FOR_MREAD;
host->sg_idx = 0;
host->sg_blkidx = 0;
- host->pio_ptr = sg_virt(data->sg);
+ host->pio_offset = data->sg->offset / 4;
sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFREN);
}
@@ -673,7 +676,7 @@ static bool sh_mmcif_mread_block(struct sh_mmcif_host *host)
{
struct device *dev = sh_mmcif_host_to_dev(host);
struct mmc_data *data = host->mrq->data;
- u32 *p = host->pio_ptr;
+ u32 *p;
int i;
if (host->sd_error) {
@@ -684,10 +687,14 @@ static bool sh_mmcif_mread_block(struct sh_mmcif_host *host)
BUG_ON(!data->sg->length);
- for (i = 0; i < host->blocksize / 4; i++)
- *p++ = sh_mmcif_readl(host->addr, MMCIF_CE_DATA);
+ p = sg_kmap_atomic(data->sg);
+ for (i = 0; i < host->blocksize / 4; i++) {
+ p[host->pio_offset++] =
+ sh_mmcif_readl(host->addr, MMCIF_CE_DATA);
+ }
+ sg_kunmap_atomic(data->sg, p);
- if (!sh_mmcif_next_block(host, p))
+ if (!sh_mmcif_next_block(host))
return false;
sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFREN);
@@ -711,8 +718,8 @@ static bool sh_mmcif_write_block(struct sh_mmcif_host *host)
{
struct device *dev = sh_mmcif_host_to_dev(host);
struct mmc_data *data = host->mrq->data;
- u32 *p = sg_virt(data->sg);
- int i;
+ u32 *p;
+ int off, i;
if (host->sd_error) {
data->error = sh_mmcif_error_manage(host);
@@ -720,8 +727,11 @@ static bool sh_mmcif_write_block(struct sh_mmcif_host *host)
return false;
}
+ p = sg_kmap_atomic(data->sg);
+ off = data->sg->offset / 4;
for (i = 0; i < host->blocksize / 4; i++)
- sh_mmcif_writel(host->addr, MMCIF_CE_DATA, *p++);
+ sh_mmcif_writel(host->addr, MMCIF_CE_DATA, p[off++]);
+ sg_kunmap_atomic(data->sg, p);
/* buffer write end */
sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MDTRANE);
@@ -744,7 +754,7 @@ static void sh_mmcif_multi_write(struct sh_mmcif_host *host,
host->wait_for = MMCIF_WAIT_FOR_MWRITE;
host->sg_idx = 0;
host->sg_blkidx = 0;
- host->pio_ptr = sg_virt(data->sg);
+ host->pio_offset = data->sg->offset / 4;
sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFWEN);
}
@@ -753,7 +763,7 @@ static bool sh_mmcif_mwrite_block(struct sh_mmcif_host *host)
{
struct device *dev = sh_mmcif_host_to_dev(host);
struct mmc_data *data = host->mrq->data;
- u32 *p = host->pio_ptr;
+ u32 *p;
int i;
if (host->sd_error) {
@@ -764,10 +774,14 @@ static bool sh_mmcif_mwrite_block(struct sh_mmcif_host *host)
BUG_ON(!data->sg->length);
- for (i = 0; i < host->blocksize / 4; i++)
- sh_mmcif_writel(host->addr, MMCIF_CE_DATA, *p++);
+ p = sg_kmap_atomic(data->sg);
+ for (i = 0; i < host->blocksize / 4; i++) {
+ sh_mmcif_writel(host->addr, MMCIF_CE_DATA,
+ p[host->pio_offset++]);
+ }
+ sg_kunmap_atomic(data->sg, p);
- if (!sh_mmcif_next_block(host, p))
+ if (!sh_mmcif_next_block(host))
return false;
sh_mmcif_bitset(host, MMCIF_CE_INT_MASK, MASK_MBUFWEN);
@@ -1424,6 +1438,7 @@ static int sh_mmcif_probe(struct platform_device *pdev)
spin_lock_init(&host->lock);
mmc->ops = &sh_mmcif_ops;
+ mmc->need_kmap = 1;
sh_mmcif_init_ocr(host);
mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_WAIT_WHILE_BUSY;
--
2.20.1
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply index
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-12 7:25 remove block layer bounce buffering for MMC v2 Christoph Hellwig
2019-02-12 7:25 ` [PATCH 01/14] scatterlist: add sg_kmap_atomic / sg_kunmap_atomic helpers Christoph Hellwig
2019-02-12 7:25 ` [PATCH 02/14] mmc: remove the unused use_blk_mq field from struct mmc_host Christoph Hellwig
2019-02-12 7:25 ` [PATCH 03/14] mmc: add a need_kmap flag to " Christoph Hellwig
2019-02-12 7:25 ` [PATCH 04/14] mmc: davinci: handle highmem pages Christoph Hellwig
2019-02-12 7:25 ` [PATCH 05/14] mmc: moxart: " Christoph Hellwig
2019-02-12 7:25 ` [PATCH 06/14] mmc: omap: " Christoph Hellwig
2019-02-12 18:39 ` Tony Lindgren
2019-02-12 7:25 ` [PATCH 07/14] mmc: omap: handle chained sglists Christoph Hellwig
2019-02-12 7:25 ` [PATCH 08/14] mmc: s3cmci: handle highmem pages Christoph Hellwig
2019-02-12 7:25 ` [PATCH 09/14] mmc: s3cmci: handle chained sglists Christoph Hellwig
2019-02-12 7:25 ` [PATCH 10/14] mmc: mvsdio: handle highmem pages Christoph Hellwig
2019-02-12 7:25 ` Christoph Hellwig [this message]
2019-02-12 7:25 ` [PATCH 12/14] mmc: sh_mmcif: handle chained sglists Christoph Hellwig
2019-02-12 7:25 ` [PATCH 13/14] mmc: core: don't use block layer bounce buffers Christoph Hellwig
2019-02-12 7:25 ` [PATCH 14/14] dma-mapping: remove dma_max_pfn Christoph Hellwig
2019-02-25 13:54 ` remove block layer bounce buffering for MMC v2 Ulf Hansson
2019-03-08 9:18 ` Christoph Hellwig
2019-03-08 9:43 ` Ulf Hansson
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20190212072528.13167-12-hch@lst.de \
--to=hch@lst.de \
--cc=aaro.koskinen@iki.fi \
--cc=ben-linux@fluff.org \
--cc=iommu@lists.linux-foundation.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mmc@vger.kernel.org \
--cc=linux-omap@vger.kernel.org \
--cc=linux@armlinux.org.uk \
--cc=nico@fluxnic.net \
--cc=ulf.hansson@linaro.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Linux-ARM-Kernel Archive on lore.kernel.org
Archives are clonable:
git clone --mirror https://lore.kernel.org/linux-arm-kernel/0 linux-arm-kernel/git/0.git
git clone --mirror https://lore.kernel.org/linux-arm-kernel/1 linux-arm-kernel/git/1.git
# If you have public-inbox 1.1+ installed, you may
# initialize and index your mirror using the following commands:
public-inbox-init -V2 linux-arm-kernel linux-arm-kernel/ https://lore.kernel.org/linux-arm-kernel \
linux-arm-kernel@lists.infradead.org
public-inbox-index linux-arm-kernel
Example config snippet for mirrors
Newsgroup available over NNTP:
nntp://nntp.lore.kernel.org/org.infradead.lists.linux-arm-kernel
AGPL code for this site: git clone https://public-inbox.org/public-inbox.git