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kernel: fix variable erasesize patch
Update this pending patch to remove the untested (variable eraseregions)
section, alongside simplifying the patch.
Signed-off-by: John Thomson <git@johnthomson.fastmail.com.au>
[refresh and split out unrelated refreshes]
Signed-off-by: Thibaut VARÈNE <hacks@slashdirt.org>
(cherry picked from commit 4f7065ed25)
This commit is contained in:
John Thomson
Koen Vandeputte
parent
656036a534
commit
993b70a429
@ -1,159 +1,10 @@
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From cd13e2cd28bf7313b6ad6986bb8d63ea98b37a48 Mon Sep 17 00:00:00 2001
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From: John Thomson <git@johnthomson.fastmail.com.au>
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To: Miquel Raynal <miquel.raynal@bootlin.com>,
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Richard Weinberger <richard@nod.at>, Vignesh Raghavendra <vigneshr@ti.com>,
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Tudor Ambarus <tudor.ambarus@microchip.com>,
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Michael Walle <michael@walle.cc>, Pratyush Yadav <p.yadav@ti.com>,
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linux-mtd@lists.infradead.org
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Cc: linux-kernel@vger.kernel.org,
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John Thomson <git@johnthomson.fastmail.com.au>,
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kernel test robot <lkp@intel.com>, Dan Carpenter <dan.carpenter@oracle.com>
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Date: Fri, 25 Dec 2020 18:50:08 +1000
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Subject: [PATCH] mtd: spi-nor: write support for minor aligned partitions
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Date: Tue, 8 Jun 2021 14:07:19 +1000
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Content preview: Do not prevent writing to mtd partitions where a partition
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boundary sits on a minor erasesize boundary. This addresses a FIXME that
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has been present since the start of the linux git history: /* Doesn' [...]
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Do not prevent writing to mtd partitions where a partition boundary sits
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on a minor erasesize boundary.
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@ -197,26 +48,65 @@ user 0m 0.00s |0m 0.00s |0m 0.01s
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sys 0m 46.94s |0m 50.38s |2m 12.46s
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Signed-off-by: John Thomson <git@johnthomson.fastmail.com.au>
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Signed-off-by: Thibaut VARÈNE <hacks+kernel@slashdirt.org>
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---
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Have not tested on variable erase regions device.
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checkpatch does not like the printk(KERN_WARNING
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these should be changed separately beforehand?
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Changes v1 -> v2:
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Added mtdcore sysfs for erasesize_minor
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Removed finding minor erasesize for variable erase regions device,
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as untested and no responses regarding it.
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Moved IF_ENABLED for SPINOR variable erase to guard setting
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erasesize_minor in spi-nor/core.c
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Removed setting erasesize to minor where partition boundaries require
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minor erase to be writable
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Simplified minor boundary check by relying on minor being a factor of
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major
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Changes RFC -> v1:
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Fix uninitialized variable smatch warning
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Reported-by: kernel test robot <lkp@intel.com>
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Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
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---
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drivers/mtd/mtdpart.c | 52 ++++++++++++++++++++++++++++---------
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drivers/mtd/spi-nor/Kconfig | 10 +++++++
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drivers/mtd/spi-nor/core.c | 10 +++++--
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drivers/mtd/mtdcore.c | 10 ++++++++++
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drivers/mtd/mtdpart.c | 35 +++++++++++++++++++++++++----------
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drivers/mtd/spi-nor/Kconfig | 10 ++++++++++
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drivers/mtd/spi-nor/core.c | 11 +++++++++--
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include/linux/mtd/mtd.h | 2 ++
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4 files changed, 60 insertions(+), 14 deletions(-)
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5 files changed, 56 insertions(+), 12 deletions(-)
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--- a/drivers/mtd/mtdcore.c
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+++ b/drivers/mtd/mtdcore.c
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@@ -163,6 +163,15 @@ static ssize_t mtd_erasesize_show(struct
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}
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static DEVICE_ATTR(erasesize, S_IRUGO, mtd_erasesize_show, NULL);
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+static ssize_t mtd_erasesize_minor_show(struct device *dev,
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+ struct device_attribute *attr, char *buf)
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+{
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+ struct mtd_info *mtd = dev_get_drvdata(dev);
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+
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+ return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->erasesize_minor);
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+}
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+static DEVICE_ATTR(erasesize_minor, S_IRUGO, mtd_erasesize_minor_show, NULL);
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+
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static ssize_t mtd_writesize_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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@@ -312,6 +321,7 @@ static struct attribute *mtd_attrs[] = {
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&dev_attr_flags.attr,
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&dev_attr_size.attr,
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&dev_attr_erasesize.attr,
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+ &dev_attr_erasesize_minor.attr,
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&dev_attr_writesize.attr,
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&dev_attr_subpagesize.attr,
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&dev_attr_oobsize.attr,
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--- a/drivers/mtd/mtdpart.c
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+++ b/drivers/mtd/mtdpart.c
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@@ -40,10 +40,11 @@ static struct mtd_info *allocate_partiti
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@@ -40,6 +40,7 @@ static struct mtd_info *allocate_partiti
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struct mtd_info *master = mtd_get_master(parent);
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int wr_alignment = (parent->flags & MTD_NO_ERASE) ?
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master->writesize : master->erasesize;
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@ -224,54 +114,22 @@ Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
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u64 parent_size = mtd_is_partition(parent) ?
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parent->part.size : parent->size;
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struct mtd_info *child;
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- u32 remainder;
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+ u32 remainder, remainder_minor;
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char *name;
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u64 tmp;
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@@ -145,6 +146,7 @@ static struct mtd_info *allocate_partiti
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int i, max = parent->numeraseregions;
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u64 end = child->part.offset + child->part.size;
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struct mtd_erase_region_info *regions = parent->eraseregions;
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+ uint32_t erasesize_minor = child->erasesize;
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/* Find the first erase regions which is part of this
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* partition. */
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@@ -155,15 +157,24 @@ static struct mtd_info *allocate_partiti
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if (i > 0)
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i--;
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- /* Pick biggest erasesize */
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for (; i < max && regions[i].offset < end; i++) {
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+ /* Pick biggest erasesize */
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if (child->erasesize < regions[i].erasesize)
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child->erasesize = regions[i].erasesize;
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+ /* Pick smallest non-zero erasesize */
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+ if ((erasesize_minor > regions[i].erasesize) && (regions[i].erasesize > 0))
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+ erasesize_minor = regions[i].erasesize;
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}
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+
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+ if (erasesize_minor < child->erasesize)
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+ child->erasesize_minor = erasesize_minor;
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+
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BUG_ON(child->erasesize == 0);
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@@ -164,6 +165,7 @@ static struct mtd_info *allocate_partiti
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} else {
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/* Single erase size */
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child->erasesize = master->erasesize;
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+ if (master->erasesize_minor)
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+ child->erasesize_minor = master->erasesize_minor;
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+ child->erasesize_minor = master->erasesize_minor;
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}
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/*
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@@ -171,26 +182,43 @@ static struct mtd_info *allocate_partiti
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@@ -171,26 +173,39 @@ static struct mtd_info *allocate_partiti
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* exposes several regions with different erasesize. Adjust
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* wr_alignment accordingly.
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*/
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- if (!(child->flags & MTD_NO_ERASE))
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+ if (!(child->flags & MTD_NO_ERASE)) {
|
||||
wr_alignment = child->erasesize;
|
||||
+ if (IS_ENABLED(CONFIG_MTD_SPI_NOR_USE_VARIABLE_ERASE) && child->erasesize_minor)
|
||||
+ wr_alignment_minor = child->erasesize_minor;
|
||||
+ wr_alignment_minor = child->erasesize_minor;
|
||||
+ }
|
||||
|
||||
tmp = mtd_get_master_ofs(child, 0);
|
||||
@ -284,13 +142,11 @@ Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
|
||||
- printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase/write block boundary -- force read-only\n",
|
||||
- part->name);
|
||||
+ if (wr_alignment_minor) {
|
||||
+ tmp = mtd_get_master_ofs(child, 0);
|
||||
+ remainder_minor = do_div(tmp, wr_alignment_minor);
|
||||
+ if (remainder_minor == 0)
|
||||
+ child->erasesize = child->erasesize_minor;
|
||||
+ /* rely on minor being a factor of major erasesize */
|
||||
+ tmp = remainder;
|
||||
+ remainder = do_div(tmp, wr_alignment_minor);
|
||||
+ }
|
||||
+
|
||||
+ if ((!wr_alignment_minor) || (wr_alignment_minor && remainder_minor != 0)) {
|
||||
+ if (remainder) {
|
||||
+ child->flags &= ~MTD_WRITEABLE;
|
||||
+ printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase/write block boundary -- force read-only\n",
|
||||
+ part->name);
|
||||
@ -304,12 +160,11 @@ Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
|
||||
- printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase/write block -- force read-only\n",
|
||||
- part->name);
|
||||
+ if (wr_alignment_minor) {
|
||||
+ tmp = mtd_get_master_ofs(child, 0) + child->part.size;
|
||||
+ remainder_minor = do_div(tmp, wr_alignment_minor);
|
||||
+ if (remainder_minor == 0)
|
||||
+ child->erasesize = child->erasesize_minor;
|
||||
+ tmp = remainder;
|
||||
+ remainder = do_div(tmp, wr_alignment_minor);
|
||||
+ }
|
||||
+ if ((!wr_alignment_minor) || (wr_alignment_minor && remainder_minor != 0)) {
|
||||
+
|
||||
+ if (remainder) {
|
||||
+ child->flags &= ~MTD_WRITEABLE;
|
||||
+ printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase/write block -- force read-only\n",
|
||||
+ part->name);
|
||||
@ -367,11 +222,12 @@ Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
|
||||
}
|
||||
}
|
||||
|
||||
@@ -2610,6 +2614,8 @@ static int spi_nor_select_erase(struct s
|
||||
@@ -2610,6 +2614,9 @@ static int spi_nor_select_erase(struct s
|
||||
return -EINVAL;
|
||||
|
||||
mtd->erasesize = erase->size;
|
||||
+ if (erase_minor && erase_minor->size < erase->size)
|
||||
+ if (IS_ENABLED(CONFIG_MTD_SPI_NOR_USE_VARIABLE_ERASE) &&
|
||||
+ erase_minor && erase_minor->size < erase->size)
|
||||
+ mtd->erasesize_minor = erase_minor->size;
|
||||
return 0;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user