From 656d47504330936d80e80c918b25d8a4f7eb3675 Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Sun, 14 Jul 2013 12:57:03 +0000 Subject: [PATCH] kernel: implement automatic rootfs split from the firmware partition in linux 3.10 (disabled by default) Signed-off-by: Felix Fietkau SVN-Revision: 37283 --- target/linux/generic/config-3.10 | 2 + .../patches-3.10/400-rootfs_split.patch | 255 ++++++++++++------ 2 files changed, 180 insertions(+), 77 deletions(-) diff --git a/target/linux/generic/config-3.10 b/target/linux/generic/config-3.10 index 769fe8d2c175..18be99dbb0cb 100644 --- a/target/linux/generic/config-3.10 +++ b/target/linux/generic/config-3.10 @@ -1840,6 +1840,8 @@ CONFIG_MTD_ROOTFS_SPLIT=y # CONFIG_MTD_SWAP is not set # CONFIG_MTD_TESTS is not set # CONFIG_MTD_UBI is not set +# CONFIG_MTD_UIMAGE_SPLIT is not set +CONFIG_MTD_UIMAGE_SPLIT_NAME="firmware" # CONFIG_MUTEX_SPIN_ON_OWNER is not set # CONFIG_MV643XX_ETH is not set # CONFIG_MVMDIO is not set diff --git a/target/linux/generic/patches-3.10/400-rootfs_split.patch b/target/linux/generic/patches-3.10/400-rootfs_split.patch index 4c8e01924072..4cacf641d8eb 100644 --- a/target/linux/generic/patches-3.10/400-rootfs_split.patch +++ b/target/linux/generic/patches-3.10/400-rootfs_split.patch @@ -1,6 +1,6 @@ --- a/drivers/mtd/Kconfig +++ b/drivers/mtd/Kconfig -@@ -23,6 +23,14 @@ config MTD_TESTS +@@ -23,6 +23,23 @@ config MTD_TESTS WARNING: some of the tests will ERASE entire MTD device which they test. Do not use these tests unless you really know what you do. @@ -11,6 +11,15 @@ +config MTD_ROOTFS_SPLIT + bool "Automatically split 'rootfs' partition for squashfs" + default y ++ ++config MTD_UIMAGE_SPLIT ++ bool "Automatically split off rootfs from a kernel partition containing a uImage" ++ default y ++ ++config MTD_UIMAGE_SPLIT_NAME ++ string "uImage partition name" ++ depends on MTD_UIMAGE_SPLIT ++ default "firmware" + config MTD_REDBOOT_PARTS tristate "RedBoot partition table parsing" @@ -26,7 +35,14 @@ #include #include "mtdcore.h" -@@ -50,7 +52,7 @@ struct mtd_part { +@@ -45,12 +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)) @@ -35,10 +51,82 @@ /* * MTD methods which simply translate the effective address and pass through -@@ -613,6 +615,92 @@ int mtd_del_partition(struct mtd_info *m +@@ -533,8 +537,10 @@ out_register: + return slave; + } + +-int mtd_add_partition(struct mtd_info *master, char *name, +- long long offset, long long length) ++ ++static int ++__mtd_add_partition(struct mtd_info *master, char *name, ++ long long offset, long long length, bool dup_check) + { + struct mtd_partition part; + struct mtd_part *p, *new; +@@ -566,21 +572,24 @@ 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: +@@ -590,6 +599,12 @@ err_inv: + } + EXPORT_SYMBOL_GPL(mtd_add_partition); + ++int mtd_add_partition(struct mtd_info *master, 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; +@@ -613,6 +628,149 @@ 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; ++} ++ +#ifdef CONFIG_MTD_ROOTFS_SPLIT +#define ROOTFS_SPLIT_NAME "rootfs_data" +#define ROOTFS_REMOVED_NAME "" @@ -77,105 +165,118 @@ + } + + len = (u32) le64_to_cpu(sb.bytes_used); -+ len += (offset & 0x000fffff); -+ len += (master->erasesize - 1); -+ len &= ~(master->erasesize - 1); -+ len -= (offset & 0x000fffff); ++ len = mtd_pad_erasesize(master, offset, len); + *split_offset = offset + len; + + return 0; +} + -+static int split_rootfs_data(struct mtd_info *master, struct mtd_info *rpart, const struct mtd_partition *part) ++static void split_rootfs_data(struct mtd_info *master, struct mtd_part *part) +{ -+ struct mtd_partition dpart; -+ struct mtd_part *slave = NULL; -+ struct mtd_part *spart; -+ int ret, split_offset = 0; ++ unsigned int split_offset = 0; ++ unsigned int split_size; ++ int ret; + -+ spart = PART(rpart); -+ ret = split_squashfs(master, spart->offset, &split_offset); ++ ret = split_squashfs(master, part->offset, &split_offset); + if (ret) -+ return ret; ++ return; + + if (split_offset <= 0) -+ return 0; ++ return; ++ ++ split_size = part->mtd.size - (split_offset - part->offset); ++ printk(KERN_INFO "mtd: partition \"%s\" created automatically, ofs=0x%x, len=0x%x\n", ++ ROOTFS_SPLIT_NAME, split_offset, split_size); ++ ++ __mtd_add_partition(master, ROOTFS_SPLIT_NAME, split_offset, ++ split_size, false); ++} ++#endif /* CONFIG_MTD_ROOTFS_SPLIT */ + -+ memcpy(&dpart, part, sizeof(dpart)); -+ dpart.name = ROOTFS_SPLIT_NAME; ++#ifdef CONFIG_MTD_UIMAGE_SPLIT ++#define UBOOT_MAGIC 0x27051956 + -+ dpart.size = rpart->size - (split_offset - spart->offset); -+ dpart.offset = split_offset; ++static void split_uimage(struct mtd_info *master, struct mtd_part *part) ++{ ++ struct { ++ __be32 magic; ++ __be32 pad[2]; ++ __be32 size; ++ } hdr; ++ size_t len; + -+ printk(KERN_INFO "mtd: partition \"%s\" created automatically, ofs=%llX, len=%llX \n", -+ ROOTFS_SPLIT_NAME, dpart.offset, dpart.size); ++ if (strcmp(part->mtd.name, CONFIG_MTD_UIMAGE_SPLIT_NAME) != 0) ++ return; + -+ slave = allocate_partition(master, &dpart, 0, split_offset); -+ if (IS_ERR(slave)) -+ return PTR_ERR(slave); -+ mutex_lock(&mtd_partitions_mutex); -+ list_add(&slave->list, &mtd_partitions); -+ mutex_unlock(&mtd_partitions_mutex); ++ if (mtd_read(master, part->offset, sizeof(hdr), &len, (void *) &hdr)) ++ return; + -+ add_mtd_device(&slave->mtd); ++ if (len != sizeof(hdr) || hdr.magic != cpu_to_be32(UBOOT_MAGIC)) ++ return; + -+ rpart->split = &slave->mtd; ++ len = be32_to_cpu(hdr.size) + 0x40; ++ len = mtd_pad_erasesize(master, part->offset, len); ++ if (len + master->erasesize > part->mtd.size) ++ return; + -+ return 0; ++ __mtd_add_partition(master, "rootfs", part->offset + len, ++ part->mtd.size - len, false); +} -+#endif /* CONFIG_MTD_ROOTFS_SPLIT */ ++#endif ++ ++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, "rootfs")) { ++ rootfs_found = 1; ++ ++#ifdef CONFIG_MTD_ROOTFS_ROOT_DEV ++ if (ROOT_DEV == 0) { ++ printk(KERN_NOTICE "mtd: partition \"rootfs\" " ++ "set to be root filesystem\n"); ++ ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, part->mtd.index); ++ } ++#endif ++#ifdef CONFIG_MTD_ROOTFS_SPLIT ++ split_rootfs_data(master, part); ++#endif ++ } + ++#ifdef CONFIG_MTD_UIMAGE_SPLIT ++ split_uimage(master, part); ++#endif ++ ++ 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 -@@ -629,6 +717,9 @@ int add_mtd_partitions(struct mtd_info * - struct mtd_part *slave; - uint64_t cur_offset = 0; - int i; -+#ifdef CONFIG_MTD_ROOTFS_SPLIT -+ int ret; -+#endif - - printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name); - -@@ -643,6 +734,21 @@ int add_mtd_partitions(struct mtd_info * +@@ -642,6 +800,7 @@ int add_mtd_partitions(struct mtd_info * + mutex_unlock(&mtd_partitions_mutex); add_mtd_device(&slave->mtd); ++ mtd_partition_split(master, slave); -+ if (!strcmp(parts[i].name, "rootfs")) { -+#ifdef CONFIG_MTD_ROOTFS_ROOT_DEV -+ if (ROOT_DEV == 0) { -+ printk(KERN_NOTICE "mtd: partition \"rootfs\" " -+ "set to be root filesystem\n"); -+ ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, slave->mtd.index); -+ } -+#endif -+#ifdef CONFIG_MTD_ROOTFS_SPLIT -+ ret = split_rootfs_data(master, &slave->mtd, &parts[i]); -+ /* if (ret == 0) -+ * j++; */ -+#endif -+ } -+ 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); ---- a/include/linux/mtd/mtd.h -+++ b/include/linux/mtd/mtd.h -@@ -114,6 +114,7 @@ struct nand_ecclayout { - - struct module; /* only needed for owner field in mtd_info */ - -+struct mtd_info; - struct mtd_info { - u_char type; - uint32_t flags; -@@ -226,6 +227,8 @@ struct mtd_info { - int (*_block_markbad) (struct mtd_info *mtd, loff_t ofs); - int (*_suspend) (struct mtd_info *mtd); - void (*_resume) (struct mtd_info *mtd); -+ struct mtd_info *split; -+ - /* - * If the driver is something smart, like UBI, it may need to maintain - * its own reference counting. The below functions are only for driver. + #endif -- 2.30.2