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2024-10-12 a5969cabbb4660eab42b6ef0412cbbd1200cf14d 
 kernel/include/linux/mtd/mtd.h
....@@ -1,20 +1,6 @@
1
+/* SPDX-License-Identifier: GPL-2.0-or-later */
12 /*
23  * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org> et al.
3
- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundation; either version 2 of the License, or
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- * (at your option) any later version.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, write to the Free Software
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- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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- *
184  */
195 
206 #ifndef __MTD_MTD_H__
....@@ -22,9 +8,11 @@
228 
239 #include <linux/types.h>
2410 #include <linux/uio.h>
11
+#include <linux/list.h>
2512 #include <linux/notifier.h>
2613 #include <linux/device.h>
2714 #include <linux/of.h>
15
+#include <linux/nvmem-provider.h>
2816 
2917 #include <mtd/mtd-abi.h>
3018 
....@@ -202,6 +190,46 @@
202190  */
203191 struct mtd_debug_info {
204192 	struct dentry *dfs_dir;
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+
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+	const char *partname;
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+	const char *partid;
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+};
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+
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+/**
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+ * struct mtd_part - MTD partition specific fields
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+ *
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+ * @node: list node used to add an MTD partition to the parent partition list
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+ * @offset: offset of the partition relatively to the parent offset
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+ * @size: partition size. Should be equal to mtd->size unless
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+ *	  MTD_SLC_ON_MLC_EMULATION is set
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+ * @flags: original flags (before the mtdpart logic decided to tweak them based
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+ *	   on flash constraints, like eraseblock/pagesize alignment)
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+ *
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+ * This struct is embedded in mtd_info and contains partition-specific
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+ * properties/fields.
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+ */
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+struct mtd_part {
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+	struct list_head node;
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+	u64 offset;
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+	u64 size;
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+	u32 flags;
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+};
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+
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+/**
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+ * struct mtd_master - MTD master specific fields
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+ *
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+ * @partitions_lock: lock protecting accesses to the partition list. Protects
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+ *		     not only the master partition list, but also all
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+ *		     sub-partitions.
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+ * @suspended: et to 1 when the device is suspended, 0 otherwise
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+ *
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+ * This struct is embedded in mtd_info and contains master-specific
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+ * properties/fields. The master is the root MTD device from the MTD partition
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+ * point of view.
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+ */
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+struct mtd_master {
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+	struct mutex partitions_lock;
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+	unsigned int suspended : 1;
205233 };
206234 
207235 struct mtd_info {
....@@ -328,6 +356,12 @@
328356 	int (*_get_device) (struct mtd_info *mtd);
329357 	void (*_put_device) (struct mtd_info *mtd);
330358 
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+	/*
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+	 * flag indicates a panic write, low level drivers can take appropriate
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+	 * action if required to ensure writes go through
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+	 */
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+	bool oops_panic_write;
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+
331365 	struct notifier_block reboot_notifier;  /* default mode before reboot */
332366 
333367 	/* ECC status information */
....@@ -341,7 +375,50 @@
341375 	struct device dev;
342376 	int usecount;
343377 	struct mtd_debug_info dbg;
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+	struct nvmem_device *nvmem;
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+
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+	/*
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+	 * Parent device from the MTD partition point of view.
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+	 *
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+	 * MTD masters do not have any parent, MTD partitions do. The parent
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+	 * MTD device can itself be a partition.
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+	 */
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+	struct mtd_info *parent;
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+
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+	/* List of partitions attached to this MTD device */
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+	struct list_head partitions;
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+
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+	struct mtd_part part;
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+	struct mtd_master master;
344393 };
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+
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+static inline struct mtd_info *mtd_get_master(struct mtd_info *mtd)
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+{
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+	while (mtd->parent)
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+		mtd = mtd->parent;
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+
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+	return mtd;
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+}
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+
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+static inline u64 mtd_get_master_ofs(struct mtd_info *mtd, u64 ofs)
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+{
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+	while (mtd->parent) {
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+		ofs += mtd->part.offset;
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+		mtd = mtd->parent;
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+	}
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+
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+	return ofs;
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+}
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+
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+static inline bool mtd_is_partition(const struct mtd_info *mtd)
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+{
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+	return mtd->parent;
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+}
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+
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+static inline bool mtd_has_partitions(const struct mtd_info *mtd)
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+{
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+	return !list_empty(&mtd->partitions);
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+}
345422 
346423 int mtd_ooblayout_ecc(struct mtd_info *mtd, int section,
347424 		      struct mtd_oob_region *oobecc);
....@@ -394,13 +471,16 @@
394471 static inline int mtd_max_bad_blocks(struct mtd_info *mtd,
395472 				     loff_t ofs, size_t len)
396473 {
397
-	if (!mtd->_max_bad_blocks)
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+	struct mtd_info *master = mtd_get_master(mtd);
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+
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+	if (!master->_max_bad_blocks)
398477 		return -ENOTSUPP;
399478 
400479 	if (mtd->size < (len + ofs) || ofs < 0)
401480 		return -EINVAL;
402481 
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-	return mtd->_max_bad_blocks(mtd, ofs, len);
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+	return master->_max_bad_blocks(master, mtd_get_master_ofs(mtd, ofs),
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+				       len);
404484 }
405485 
406486 int mtd_wunit_to_pairing_info(struct mtd_info *mtd, int wunit,
....@@ -441,8 +521,10 @@
441521 
442522 static inline void mtd_sync(struct mtd_info *mtd)
443523 {
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-	if (mtd->_sync)
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-		mtd->_sync(mtd);
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+	struct mtd_info *master = mtd_get_master(mtd);
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+
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+	if (master->_sync)
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+		master->_sync(master);
446528 }
447529 
448530 int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len);
....@@ -454,13 +536,31 @@
454536 
455537 static inline int mtd_suspend(struct mtd_info *mtd)
456538 {
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-	return mtd->_suspend ? mtd->_suspend(mtd) : 0;
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+	struct mtd_info *master = mtd_get_master(mtd);
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+	int ret;
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+
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+	if (master->master.suspended)
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+		return 0;
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+
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+	ret = master->_suspend ? master->_suspend(master) : 0;
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+	if (ret)
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+		return ret;
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+
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+	master->master.suspended = 1;
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+	return 0;
458551 }
459552 
460553 static inline void mtd_resume(struct mtd_info *mtd)
461554 {
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-	if (mtd->_resume)
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-		mtd->_resume(mtd);
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+	struct mtd_info *master = mtd_get_master(mtd);
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+
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+	if (!master->master.suspended)
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+		return;
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+
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+	if (master->_resume)
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+		master->_resume(master);
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+
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+	master->master.suspended = 0;
464564 }
465565 
466566 static inline uint32_t mtd_div_by_eb(uint64_t sz, struct mtd_info *mtd)
....@@ -523,7 +623,9 @@
523623 
524624 static inline int mtd_wunit_per_eb(struct mtd_info *mtd)
525625 {
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-	return mtd->erasesize / mtd->writesize;
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+	struct mtd_info *master = mtd_get_master(mtd);
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+
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+	return master->erasesize / mtd->writesize;
527629 }
528630 
529631 static inline int mtd_offset_to_wunit(struct mtd_info *mtd, loff_t offs)
....@@ -540,7 +642,9 @@
540642 
541643 static inline int mtd_has_oob(const struct mtd_info *mtd)
542644 {
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-	return mtd->_read_oob && mtd->_write_oob;
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+	struct mtd_info *master = mtd_get_master((struct mtd_info *)mtd);
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+
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+	return master->_read_oob && master->_write_oob;
544648 }
545649 
546650 static inline int mtd_type_is_nand(const struct mtd_info *mtd)
....@@ -550,7 +654,9 @@
550654 
551655 static inline int mtd_can_have_bb(const struct mtd_info *mtd)
552656 {
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-	return !!mtd->_block_isbad;
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+	struct mtd_info *master = mtd_get_master((struct mtd_info *)mtd);
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+
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+	return !!master->_block_isbad;
554660 }
555661 
556662 	/* Kernel-side ioctl definitions */