Openwrt/target/linux/generic/pending-5.4/411-mtd-partial_eraseblock_write.patch

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From: Felix Fietkau <nbd@nbd.name>
Subject: mtd: implement write support for partitions covering only a part of an eraseblock (buffer data that would otherwise be erased)
lede-commit: 87a8e8ac1067f58ba831c4aae443f3655c31cd80
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
drivers/mtd/mtdpart.c | 90 ++++++++++++++++++++++++++++++++++++++++++++-----
include/linux/mtd/mtd.h | 4 +++
2 files changed, 85 insertions(+), 9 deletions(-)
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
kernel: add support for kernel 5.4 The following patches were removed because they are integrated in the upstream kernel 5.4: * backport-5.4/047-v4.21-mtd-keep-original-flags-for-every-struct-mtd_info.patch * backport-5.4/048-v4.21-mtd-improve-calculating-partition-boundaries-when-ch.patch * backport-5.4/080-v5.1-0001-bcma-keep-a-direct-pointer-to-the-struct-device.patch * backport-5.4/080-v5.1-0002-bcma-use-dev_-printing-functions.patch * backport-5.4/095-Allow-class-e-address-assignment-via-ifconfig-ioctl.patch * backport-5.4/101-arm-cns3xxx-use-actual-size-reads-for-PCIe.patch * backport-5.4/200-v5.2-usb-dwc2-Set-lpm-mode-parameters-depend-on-HW-configuration.patch * backport-5.4/210-arm64-sve-Disentangle-uapi-asm-ptrace.h-from-uapi-as.patch * backport-5.4/380-v5.3-net-sched-Introduce-act_ctinfo-action.patch * backport-5.4/450-v5.0-mtd-spinand-winbond-Add-support-for-W25N01GV.patch * backport-5.4/451-v5.0-mtd-spinand-Add-initial-support-for-Toshiba-TC58CVG2.patch * backport-5.4/452-v5.0-mtd-spinand-add-support-for-GigaDevice-GD5FxGQ4xA.patch * backport-5.4/455-v5.1-mtd-spinand-Add-support-for-all-Toshiba-Memory-produ.patch * backport-5.4/456-v5.1-mtd-spinand-Add-support-for-GigaDevice-GD5F1GQ4UExxG.patch * backport-5.4/460-v5.0-mtd-spi-nor-Add-support-for-mx25u12835f.patch * backport-5.4/460-v5.3-mtd-spinand-Define-macros-for-page-read-ops-with-thr.patch * backport-5.4/461-v5.3-mtd-spinand-Add-support-for-two-byte-device-IDs.patch * backport-5.4/462-v5.3-mtd-spinand-Add-support-for-GigaDevice-GD5F1GQ4UFxxG.patch * backport-5.4/463-v5.3-mtd-spinand-Add-initial-support-for-Paragon-PN26G0xA.patch * backport-5.4/700-v5.1-net-phylink-only-call-mac_config-during-resolve-when.patch * backport-5.4/701-v5.2-net-phylink-ensure-inband-AN-works-correctly.patch * backport-5.4/702-v4.20-net-ethernet-Add-helper-for-MACs-which-support-asym-.patch * backport-5.4/703-v4.20-net-ethernet-Add-helper-for-set_pauseparam-for-Asym-.patch * backport-5.4/704-v4.20-net-phy-Stop-with-excessive-soft-reset.patch * backport-5.4/705-v5.1-net-phy-provide-full-set-of-accessor-functions-to-MM.patch * backport-5.4/706-v5.1-net-phy-add-register-modifying-helpers-returning-1-o.patch * backport-5.4/707-v5.1-net-phy-add-genphy_c45_check_and_restart_aneg.patch * backport-5.4/708-v5.3-net-phylink-remove-netdev-from-phylink-mii-ioctl-emu.patch * backport-5.4/709-v5.3-net-phylink-support-for-link-gpio-interrupt.patch * backport-5.4/710-v5.3-net-phy-allow-Clause-45-access-via-mii-ioctl.patch * backport-5.4/711-v5.3-net-sfp-add-mandatory-attach-detach-methods-for-sfp-.patch * backport-5.4/712-v5.3-net-sfp-remove-sfp-bus-use-of-netdevs.patch * backport-5.4/713-v5.2-net-phylink-avoid-reducing-support-mask.patch * backport-5.4/714-v5.3-net-sfp-Stop-SFP-polling-and-interrupt-handling-duri.patch * backport-5.4/715-v5.3-net-phylink-don-t-start-and-stop-SGMII-PHYs-in-SFP-m.patch * backport-5.4/740-v5.5-net-phy-avoid-matching-all-ones-clause-45-PHY-IDs.patch * backport-5.4/741-v5.5-net-phylink-fix-link-mode-modification-in-PHY-mode.patch * pending-5.4/103-MIPS-perf-ath79-Fix-perfcount-IRQ-assignment.patch * pending-5.4/131-spi-use-gpio_set_value_cansleep-for-setting-chipsele.patch * pending-5.4/132-spi-spi-gpio-fix-crash-when-num-chipselects-is-0.patch * pending-5.4/220-optimize_inlining.patch * pending-5.4/341-MIPS-mm-remove-no-op-dma_map_ops-where-possible.patch * pending-5.4/475-mtd-spi-nor-Add-Winbond-w25q128jv-support.patch * pending-5.4/477-mtd-add-spi-nor-add-mx25u3235f.patch * pending-5.4/479-mtd-spi-nor-add-eon-en25qh64.patch Some bigger changes were done to this feature and we did not port this patch yet: * hack-5.4/207-disable-modorder.patch This depends on BOOTMEM which was removed from the kernel, this needs some bigger changes: * hack-5.4/930-crashlog.patch A different version of the FPU disable patch was merged upstream, OpenWrt needs some adaptations. * pending-5.4/304-mips_disable_fpu.patch - no crashlog support yet as a required file got deleted upstream - Removed patch below, which is now seen as a recursive dependency [1] - Removed patch below due to build error [2] - fix still required to avoid identical function def [3] - Fixes included from Blocktrron - Fixes included from Chunkeey - Fix included from nbd regarding "dst leak in Flow Offload" [1] target/linux/generic/hack-5.4/260-crypto_test_dependencies.patch [2] target/linux/generic/hack-5.4/207-disable-modorder.patch [3] target/linux/generic/pending-5.4/613-netfilter_optional_tcp_window_check.patch Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com> Signed-off-by: David Bauer <mail@david-bauer.net> Signed-off-by: Christian Lamparter <chunkeey@gmail.com> Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com> Signed-off-by: Robert Marko <robimarko@gmail.com> Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
2019-11-25 15:08:31 +00:00
@@ -22,6 +22,8 @@
#include "mtdcore.h"
#include "mtdsplit/mtdsplit.h"
+#define MTD_ERASE_PARTIAL 0x8000 /* partition only covers parts of an erase block */
+
/* Our partition linked list */
static LIST_HEAD(mtd_partitions);
static DEFINE_MUTEX(mtd_partitions_mutex);
@@ -206,11 +208,77 @@ static int part_erase(struct mtd_info *m
{
struct mtd_part *part = mtd_to_part(mtd);
int ret;
+ size_t wrlen = 0;
+ u8 *erase_buf = NULL;
+ u32 erase_buf_ofs = 0;
+ bool partial_start = false;
+
+ if (mtd->flags & MTD_ERASE_PARTIAL) {
+ size_t readlen = 0;
+ u64 mtd_ofs;
+
+ erase_buf = kmalloc(part->parent->erasesize, GFP_ATOMIC);
+ if (!erase_buf)
+ return -ENOMEM;
+
+ mtd_ofs = part->offset + instr->addr;
+ erase_buf_ofs = do_div(mtd_ofs, part->parent->erasesize);
+
+ if (erase_buf_ofs > 0) {
+ instr->addr -= erase_buf_ofs;
+ ret = mtd_read(part->parent,
+ instr->addr + part->offset,
+ part->parent->erasesize,
+ &readlen, erase_buf);
+
+ instr->len += erase_buf_ofs;
+ partial_start = true;
+ } else {
+ mtd_ofs = part->offset + part->mtd.size;
+ erase_buf_ofs = part->parent->erasesize -
+ do_div(mtd_ofs, part->parent->erasesize);
+
+ if (erase_buf_ofs > 0) {
+ instr->len += erase_buf_ofs;
+ ret = mtd_read(part->parent,
+ part->offset + instr->addr +
+ instr->len - part->parent->erasesize,
+ part->parent->erasesize, &readlen,
+ erase_buf);
+ } else {
+ ret = 0;
+ }
+ }
+ if (ret < 0) {
+ kfree(erase_buf);
+ return ret;
+ }
+
+ }
instr->addr += part->offset;
ret = part->parent->_erase(part->parent, instr);
if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
instr->fail_addr -= part->offset;
+
+ if (mtd->flags & MTD_ERASE_PARTIAL) {
+ if (partial_start) {
+ part->parent->_write(part->parent,
+ instr->addr, erase_buf_ofs,
+ &wrlen, erase_buf);
+ instr->addr += erase_buf_ofs;
+ } else {
+ instr->len -= erase_buf_ofs;
+ part->parent->_write(part->parent,
+ instr->addr + instr->len,
+ erase_buf_ofs, &wrlen,
+ erase_buf +
+ part->parent->erasesize -
+ erase_buf_ofs);
+ }
+ kfree(erase_buf);
+ }
+
instr->addr -= part->offset;
return ret;
@@ -525,19 +593,22 @@ static struct mtd_part *allocate_partiti
remainder = do_div(tmp, wr_alignment);
if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) {
/* Doesn't start on a boundary of major erase size */
- /* FIXME: Let it be writable if it is on a boundary of
- * _minor_ erase size though */
- slave->mtd.flags &= ~MTD_WRITEABLE;
- printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase/write block boundary -- force read-only\n",
- part->name);
+ slave->mtd.flags |= MTD_ERASE_PARTIAL;
+ if (((u32)slave->mtd.size) > parent->erasesize)
+ slave->mtd.flags &= ~MTD_WRITEABLE;
+ else
+ slave->mtd.erasesize = slave->mtd.size;
}
tmp = part_absolute_offset(parent) + slave->offset + slave->mtd.size;
remainder = do_div(tmp, wr_alignment);
if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) {
- slave->mtd.flags &= ~MTD_WRITEABLE;
- printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase/write block -- force read-only\n",
- part->name);
+ slave->mtd.flags |= MTD_ERASE_PARTIAL;
+
+ if ((u32)slave->mtd.size > parent->erasesize)
+ slave->mtd.flags &= ~MTD_WRITEABLE;
+ else
+ slave->mtd.erasesize = slave->mtd.size;
}
mtd_set_ooblayout(&slave->mtd, &part_ooblayout_ops);