8dbcaf63b2
MediaTek needs to use specific reserved memory for merge buffer to ensure the data correctness during merge period. The specific path would be enabled only if bootarg "mtk_kcopyd_quirk" is well defined to be isolated for MediaTek platform only. The format of bootarg would be: mtk_kcopyd_quirk=mediatek,dm_ota where "dm_ota" is exact the name of the reserved memory. Bug: 223346425 Change-Id: I2b295ca8c0cea65146077324c58ac17c05fe0099 Signed-off-by: Will Shiu <Will.Shiu@mediatek.com> Signed-off-by: Stanley Chu <stanley.chu@mediatek.com> Signed-off-by: Akilesh Kailash <akailash@google.com>
91 lines
2.9 KiB
C
91 lines
2.9 KiB
C
/*
|
|
* Copyright (C) 2001 - 2003 Sistina Software
|
|
* Copyright (C) 2004 - 2008 Red Hat, Inc. All rights reserved.
|
|
*
|
|
* kcopyd provides a simple interface for copying an area of one
|
|
* block-device to one or more other block-devices, either synchronous
|
|
* or with an asynchronous completion notification.
|
|
*
|
|
* This file is released under the GPL.
|
|
*/
|
|
|
|
#ifndef _LINUX_DM_KCOPYD_H
|
|
#define _LINUX_DM_KCOPYD_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <linux/dm-io.h>
|
|
|
|
/* FIXME: make this configurable */
|
|
#define DM_KCOPYD_MAX_REGIONS 8
|
|
|
|
#define DM_KCOPYD_IGNORE_ERROR 1
|
|
#define DM_KCOPYD_WRITE_SEQ 2
|
|
#define DM_KCOPYD_SNAP_MERGE 3
|
|
|
|
struct dm_kcopyd_throttle {
|
|
unsigned throttle;
|
|
unsigned num_io_jobs;
|
|
unsigned io_period;
|
|
unsigned total_period;
|
|
unsigned last_jiffies;
|
|
};
|
|
|
|
/*
|
|
* kcopyd clients that want to support throttling must pass an initialised
|
|
* dm_kcopyd_throttle struct into dm_kcopyd_client_create().
|
|
* Two or more clients may share the same instance of this struct between
|
|
* them if they wish to be throttled as a group.
|
|
*
|
|
* This macro also creates a corresponding module parameter to configure
|
|
* the amount of throttling.
|
|
*/
|
|
#define DECLARE_DM_KCOPYD_THROTTLE_WITH_MODULE_PARM(name, description) \
|
|
static struct dm_kcopyd_throttle dm_kcopyd_throttle = { 100, 0, 0, 0, 0 }; \
|
|
module_param_named(name, dm_kcopyd_throttle.throttle, uint, 0644); \
|
|
MODULE_PARM_DESC(name, description)
|
|
|
|
/*
|
|
* To use kcopyd you must first create a dm_kcopyd_client object.
|
|
* throttle can be NULL if you don't want any throttling.
|
|
*/
|
|
struct dm_kcopyd_client;
|
|
struct dm_kcopyd_client *dm_kcopyd_client_create(struct dm_kcopyd_throttle *throttle);
|
|
void dm_kcopyd_client_destroy(struct dm_kcopyd_client *kc);
|
|
|
|
/*
|
|
* Submit a copy job to kcopyd. This is built on top of the
|
|
* previous three fns.
|
|
*
|
|
* read_err is a boolean,
|
|
* write_err is a bitset, with 1 bit for each destination region
|
|
*/
|
|
typedef void (*dm_kcopyd_notify_fn)(int read_err, unsigned long write_err,
|
|
void *context);
|
|
|
|
void dm_kcopyd_copy(struct dm_kcopyd_client *kc, struct dm_io_region *from,
|
|
unsigned num_dests, struct dm_io_region *dests,
|
|
unsigned flags, dm_kcopyd_notify_fn fn, void *context);
|
|
|
|
/*
|
|
* Prepare a callback and submit it via the kcopyd thread.
|
|
*
|
|
* dm_kcopyd_prepare_callback allocates a callback structure and returns it.
|
|
* It must not be called from interrupt context.
|
|
* The returned value should be passed into dm_kcopyd_do_callback.
|
|
*
|
|
* dm_kcopyd_do_callback submits the callback.
|
|
* It may be called from interrupt context.
|
|
* The callback is issued from the kcopyd thread.
|
|
*/
|
|
void *dm_kcopyd_prepare_callback(struct dm_kcopyd_client *kc,
|
|
dm_kcopyd_notify_fn fn, void *context);
|
|
void dm_kcopyd_do_callback(void *job, int read_err, unsigned long write_err);
|
|
|
|
void dm_kcopyd_zero(struct dm_kcopyd_client *kc,
|
|
unsigned num_dests, struct dm_io_region *dests,
|
|
unsigned flags, dm_kcopyd_notify_fn fn, void *context);
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif /* _LINUX_DM_KCOPYD_H */
|