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authorRafał Miłecki <zajec5@gmail.com>2014-10-27 18:14:39 +0000
committerRafał Miłecki <zajec5@gmail.com>2014-10-27 18:14:39 +0000
commit1513b39a8c8e21e3f8fbebab9fb4c41040ccf695 (patch)
tree7c786effff410b4a96d29c920d60cd279236fbf7 /target/linux/generic/patches-3.18/400-mtd-add-rootfs-split-support.patch
parent38e72c779e229933625d96d4355a0250123b6ce5 (diff)
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kernel: start working on 3.18 support
This commit: 1) Copies 3.14 patches 2) Drops mainlined stuff 3) Modifies some patches to apply Signed-off-by: Rafał Miłecki <zajec5@gmail.com> SVN-Revision: 43093
Diffstat (limited to 'target/linux/generic/patches-3.18/400-mtd-add-rootfs-split-support.patch')
-rw-r--r--target/linux/generic/patches-3.18/400-mtd-add-rootfs-split-support.patch215
1 files changed, 215 insertions, 0 deletions
diff --git a/target/linux/generic/patches-3.18/400-mtd-add-rootfs-split-support.patch b/target/linux/generic/patches-3.18/400-mtd-add-rootfs-split-support.patch
new file mode 100644
index 0000000000..6ec19b119b
--- /dev/null
+++ b/target/linux/generic/patches-3.18/400-mtd-add-rootfs-split-support.patch
@@ -0,0 +1,215 @@
+--- a/drivers/mtd/Kconfig
++++ b/drivers/mtd/Kconfig
+@@ -12,6 +12,28 @@ menuconfig MTD
+
+ if MTD
+
++menu "OpenWrt specific MTD options"
++
++config MTD_ROOTFS_ROOT_DEV
++ bool "Automatically set 'rootfs' partition to be root filesystem"
++ default y
++
++config MTD_SPLIT_FIRMWARE
++ bool "Automatically split firmware partition for kernel+rootfs"
++ default y
++
++config MTD_SPLIT_FIRMWARE_NAME
++ string "Firmware partition name"
++ depends on MTD_SPLIT_FIRMWARE
++ default "firmware"
++
++config MTD_UIMAGE_SPLIT
++ bool "Enable split support for firmware partitions containing a uImage"
++ depends on MTD_SPLIT_FIRMWARE
++ default y
++
++endmenu
++
+ config MTD_TESTS
+ tristate "MTD tests support (DANGEROUS)"
+ depends on m
+--- a/drivers/mtd/mtdpart.c
++++ b/drivers/mtd/mtdpart.c
+@@ -29,9 +29,11 @@
+ #include <linux/kmod.h>
+ #include <linux/mtd/mtd.h>
+ #include <linux/mtd/partitions.h>
++#include <linux/magic.h>
+ #include <linux/err.h>
+
+ #include "mtdcore.h"
++#include "mtdsplit.h"
+
+ /* Our partition linked list */
+ static LIST_HEAD(mtd_partitions);
+@@ -45,13 +47,14 @@ struct mtd_part {
+ struct list_head list;
+ };
+
++static void mtd_partition_split(struct mtd_info *master, struct mtd_part *part);
++
+ /*
+ * Given a pointer to the MTD object in the mtd_part structure, we can retrieve
+ * the pointer to that structure with this macro.
+ */
+ #define PART(x) ((struct mtd_part *)(x))
+
+-
+ /*
+ * MTD methods which simply translate the effective address and pass through
+ * to the _real_ device.
+@@ -547,8 +550,10 @@ out_register:
+ return slave;
+ }
+
+-int mtd_add_partition(struct mtd_info *master, const char *name,
+- long long offset, long long length)
++
++static int
++__mtd_add_partition(struct mtd_info *master, const char *name,
++ long long offset, long long length, bool dup_check)
+ {
+ struct mtd_partition part;
+ struct mtd_part *p, *new;
+@@ -580,21 +585,24 @@ int mtd_add_partition(struct mtd_info *m
+ end = offset + length;
+
+ mutex_lock(&mtd_partitions_mutex);
+- list_for_each_entry(p, &mtd_partitions, list)
+- if (p->master == master) {
+- if ((start >= p->offset) &&
+- (start < (p->offset + p->mtd.size)))
+- goto err_inv;
+-
+- if ((end >= p->offset) &&
+- (end < (p->offset + p->mtd.size)))
+- goto err_inv;
+- }
++ if (dup_check) {
++ list_for_each_entry(p, &mtd_partitions, list)
++ if (p->master == master) {
++ if ((start >= p->offset) &&
++ (start < (p->offset + p->mtd.size)))
++ goto err_inv;
++
++ if ((end >= p->offset) &&
++ (end < (p->offset + p->mtd.size)))
++ goto err_inv;
++ }
++ }
+
+ list_add(&new->list, &mtd_partitions);
+ mutex_unlock(&mtd_partitions_mutex);
+
+ add_mtd_device(&new->mtd);
++ mtd_partition_split(master, new);
+
+ return ret;
+ err_inv:
+@@ -604,6 +612,12 @@ err_inv:
+ }
+ EXPORT_SYMBOL_GPL(mtd_add_partition);
+
++int mtd_add_partition(struct mtd_info *master, const char *name,
++ long long offset, long long length)
++{
++ return __mtd_add_partition(master, name, offset, length, true);
++}
++
+ int mtd_del_partition(struct mtd_info *master, int partno)
+ {
+ struct mtd_part *slave, *next;
+@@ -627,6 +641,74 @@ int mtd_del_partition(struct mtd_info *m
+ }
+ EXPORT_SYMBOL_GPL(mtd_del_partition);
+
++static inline unsigned long
++mtd_pad_erasesize(struct mtd_info *mtd, int offset, int len)
++{
++ unsigned long mask = mtd->erasesize - 1;
++
++ len += offset & mask;
++ len = (len + mask) & ~mask;
++ len -= offset & mask;
++ return len;
++}
++
++#define UBOOT_MAGIC 0x27051956
++
++static void split_uimage(struct mtd_info *master, struct mtd_part *part)
++{
++ struct {
++ __be32 magic;
++ __be32 pad[2];
++ __be32 size;
++ } hdr;
++ size_t len;
++
++ if (mtd_read(master, part->offset, sizeof(hdr), &len, (void *) &hdr))
++ return;
++
++ if (len != sizeof(hdr) || hdr.magic != cpu_to_be32(UBOOT_MAGIC))
++ return;
++
++ len = be32_to_cpu(hdr.size) + 0x40;
++ len = mtd_pad_erasesize(master, part->offset, len);
++ if (len + master->erasesize > part->mtd.size)
++ return;
++
++ __mtd_add_partition(master, "rootfs", part->offset + len,
++ part->mtd.size - len, false);
++}
++
++#ifdef CONFIG_MTD_SPLIT_FIRMWARE_NAME
++#define SPLIT_FIRMWARE_NAME CONFIG_MTD_SPLIT_FIRMWARE_NAME
++#else
++#define SPLIT_FIRMWARE_NAME "unused"
++#endif
++
++static void split_firmware(struct mtd_info *master, struct mtd_part *part)
++{
++ if (config_enabled(CONFIG_MTD_UIMAGE_SPLIT))
++ split_uimage(master, part);
++}
++
++void __weak arch_split_mtd_part(struct mtd_info *master, const char *name,
++ int offset, int size)
++{
++}
++
++static void mtd_partition_split(struct mtd_info *master, struct mtd_part *part)
++{
++ static int rootfs_found = 0;
++
++ if (rootfs_found)
++ return;
++
++ if (!strcmp(part->mtd.name, SPLIT_FIRMWARE_NAME) &&
++ config_enabled(CONFIG_MTD_SPLIT_FIRMWARE))
++ split_firmware(master, part);
++
++ arch_split_mtd_part(master, part->mtd.name, part->offset,
++ part->mtd.size);
++}
+ /*
+ * This function, given a master MTD object and a partition table, creates
+ * and registers slave MTD objects which are bound to the master according to
+@@ -656,6 +738,7 @@ int add_mtd_partitions(struct mtd_info *
+ mutex_unlock(&mtd_partitions_mutex);
+
+ add_mtd_device(&slave->mtd);
++ mtd_partition_split(master, slave);
+
+ cur_offset = slave->offset + slave->mtd.size;
+ }
+--- a/include/linux/mtd/partitions.h
++++ b/include/linux/mtd/partitions.h
+@@ -84,5 +84,7 @@ int mtd_add_partition(struct mtd_info *m
+ long long offset, long long length);
+ int mtd_del_partition(struct mtd_info *master, int partno);
+ uint64_t mtd_get_device_size(const struct mtd_info *mtd);
++extern void __weak arch_split_mtd_part(struct mtd_info *master,
++ const char *name, int offset, int size);
+
+ #endif