Revision 3e1a0699095803e53072699a4a1485af7744601d authored by Joe Thornber on 03 March 2014, 16:03:26 UTC, committed by Mike Snitzer on 05 March 2014, 20:26:58 UTC
Ideally a thin pool would never run out of data space; the low water mark would trigger userland to extend the pool before we completely run out of space. However, many small random IOs to unprovisioned space can consume data space at an alarming rate. Adjust your low water mark if you're frequently seeing "out-of-data-space" mode. Before this fix, if data space ran out the pool would be put in PM_READ_ONLY mode which also aborted the pool's current metadata transaction (data loss for any changes in the transaction). This had a side-effect of needlessly compromising data consistency. And retry of queued unserviceable bios, once the data pool was resized, could initiate changes to potentially inconsistent pool metadata. Now when the pool's data space is exhausted transition to a new pool mode (PM_OUT_OF_DATA_SPACE) that allows metadata to be changed but data may not be allocated. This allows users to remove thin volumes or discard data to recover data space. The pool is no longer put in PM_READ_ONLY mode in response to the pool running out of data space. And PM_READ_ONLY mode no longer aborts the pool's current metadata transaction. Also, set_pool_mode() will now notify userspace when the pool mode is changed. Signed-off-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
1 parent 07f2b6e
max8649.c
/*
* Regulators driver for Maxim max8649
*
* Copyright (C) 2009-2010 Marvell International Ltd.
* Haojian Zhuang <haojian.zhuang@marvell.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/slab.h>
#include <linux/regulator/max8649.h>
#include <linux/regmap.h>
#define MAX8649_DCDC_VMIN 750000 /* uV */
#define MAX8649_DCDC_VMAX 1380000 /* uV */
#define MAX8649_DCDC_STEP 10000 /* uV */
#define MAX8649_VOL_MASK 0x3f
/* Registers */
#define MAX8649_MODE0 0x00
#define MAX8649_MODE1 0x01
#define MAX8649_MODE2 0x02
#define MAX8649_MODE3 0x03
#define MAX8649_CONTROL 0x04
#define MAX8649_SYNC 0x05
#define MAX8649_RAMP 0x06
#define MAX8649_CHIP_ID1 0x08
#define MAX8649_CHIP_ID2 0x09
/* Bits */
#define MAX8649_EN_PD (1 << 7)
#define MAX8649_VID0_PD (1 << 6)
#define MAX8649_VID1_PD (1 << 5)
#define MAX8649_VID_MASK (3 << 5)
#define MAX8649_FORCE_PWM (1 << 7)
#define MAX8649_SYNC_EXTCLK (1 << 6)
#define MAX8649_EXT_MASK (3 << 6)
#define MAX8649_RAMP_MASK (7 << 5)
#define MAX8649_RAMP_DOWN (1 << 1)
struct max8649_regulator_info {
struct regulator_dev *regulator;
struct device *dev;
struct regmap *regmap;
unsigned mode:2; /* bit[1:0] = VID1, VID0 */
unsigned extclk_freq:2;
unsigned extclk:1;
unsigned ramp_timing:3;
unsigned ramp_down:1;
};
static int max8649_enable_time(struct regulator_dev *rdev)
{
struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
int voltage, rate, ret;
unsigned int val;
/* get voltage */
ret = regmap_read(info->regmap, rdev->desc->vsel_reg, &val);
if (ret != 0)
return ret;
val &= MAX8649_VOL_MASK;
voltage = regulator_list_voltage_linear(rdev, (unsigned char)val);
/* get rate */
ret = regmap_read(info->regmap, MAX8649_RAMP, &val);
if (ret != 0)
return ret;
ret = (val & MAX8649_RAMP_MASK) >> 5;
rate = (32 * 1000) >> ret; /* uV/uS */
return DIV_ROUND_UP(voltage, rate);
}
static int max8649_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
switch (mode) {
case REGULATOR_MODE_FAST:
regmap_update_bits(info->regmap, rdev->desc->vsel_reg,
MAX8649_FORCE_PWM, MAX8649_FORCE_PWM);
break;
case REGULATOR_MODE_NORMAL:
regmap_update_bits(info->regmap, rdev->desc->vsel_reg,
MAX8649_FORCE_PWM, 0);
break;
default:
return -EINVAL;
}
return 0;
}
static unsigned int max8649_get_mode(struct regulator_dev *rdev)
{
struct max8649_regulator_info *info = rdev_get_drvdata(rdev);
unsigned int val;
int ret;
ret = regmap_read(info->regmap, rdev->desc->vsel_reg, &val);
if (ret != 0)
return ret;
if (val & MAX8649_FORCE_PWM)
return REGULATOR_MODE_FAST;
return REGULATOR_MODE_NORMAL;
}
static struct regulator_ops max8649_dcdc_ops = {
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.list_voltage = regulator_list_voltage_linear,
.map_voltage = regulator_map_voltage_linear,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.enable_time = max8649_enable_time,
.set_mode = max8649_set_mode,
.get_mode = max8649_get_mode,
};
static struct regulator_desc dcdc_desc = {
.name = "max8649",
.ops = &max8649_dcdc_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = 1 << 6,
.owner = THIS_MODULE,
.vsel_mask = MAX8649_VOL_MASK,
.min_uV = MAX8649_DCDC_VMIN,
.uV_step = MAX8649_DCDC_STEP,
.enable_reg = MAX8649_CONTROL,
.enable_mask = MAX8649_EN_PD,
.enable_is_inverted = true,
};
static struct regmap_config max8649_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
};
static int max8649_regulator_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct max8649_platform_data *pdata = dev_get_platdata(&client->dev);
struct max8649_regulator_info *info = NULL;
struct regulator_config config = { };
unsigned int val;
unsigned char data;
int ret;
info = devm_kzalloc(&client->dev, sizeof(struct max8649_regulator_info),
GFP_KERNEL);
if (!info) {
dev_err(&client->dev, "No enough memory\n");
return -ENOMEM;
}
info->regmap = devm_regmap_init_i2c(client, &max8649_regmap_config);
if (IS_ERR(info->regmap)) {
ret = PTR_ERR(info->regmap);
dev_err(&client->dev, "Failed to allocate register map: %d\n", ret);
return ret;
}
info->dev = &client->dev;
i2c_set_clientdata(client, info);
info->mode = pdata->mode;
switch (info->mode) {
case 0:
dcdc_desc.vsel_reg = MAX8649_MODE0;
break;
case 1:
dcdc_desc.vsel_reg = MAX8649_MODE1;
break;
case 2:
dcdc_desc.vsel_reg = MAX8649_MODE2;
break;
case 3:
dcdc_desc.vsel_reg = MAX8649_MODE3;
break;
default:
break;
}
ret = regmap_read(info->regmap, MAX8649_CHIP_ID1, &val);
if (ret != 0) {
dev_err(info->dev, "Failed to detect ID of MAX8649:%d\n",
ret);
return ret;
}
dev_info(info->dev, "Detected MAX8649 (ID:%x)\n", val);
/* enable VID0 & VID1 */
regmap_update_bits(info->regmap, MAX8649_CONTROL, MAX8649_VID_MASK, 0);
/* enable/disable external clock synchronization */
info->extclk = pdata->extclk;
data = (info->extclk) ? MAX8649_SYNC_EXTCLK : 0;
regmap_update_bits(info->regmap, dcdc_desc.vsel_reg,
MAX8649_SYNC_EXTCLK, data);
if (info->extclk) {
/* set external clock frequency */
info->extclk_freq = pdata->extclk_freq;
regmap_update_bits(info->regmap, MAX8649_SYNC, MAX8649_EXT_MASK,
info->extclk_freq << 6);
}
if (pdata->ramp_timing) {
info->ramp_timing = pdata->ramp_timing;
regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_MASK,
info->ramp_timing << 5);
}
info->ramp_down = pdata->ramp_down;
if (info->ramp_down) {
regmap_update_bits(info->regmap, MAX8649_RAMP, MAX8649_RAMP_DOWN,
MAX8649_RAMP_DOWN);
}
config.dev = &client->dev;
config.init_data = pdata->regulator;
config.driver_data = info;
config.regmap = info->regmap;
info->regulator = devm_regulator_register(&client->dev, &dcdc_desc,
&config);
if (IS_ERR(info->regulator)) {
dev_err(info->dev, "failed to register regulator %s\n",
dcdc_desc.name);
return PTR_ERR(info->regulator);
}
return 0;
}
static const struct i2c_device_id max8649_id[] = {
{ "max8649", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, max8649_id);
static struct i2c_driver max8649_driver = {
.probe = max8649_regulator_probe,
.driver = {
.name = "max8649",
},
.id_table = max8649_id,
};
static int __init max8649_init(void)
{
return i2c_add_driver(&max8649_driver);
}
subsys_initcall(max8649_init);
static void __exit max8649_exit(void)
{
i2c_del_driver(&max8649_driver);
}
module_exit(max8649_exit);
/* Module information */
MODULE_DESCRIPTION("MAXIM 8649 voltage regulator driver");
MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
MODULE_LICENSE("GPL");
![swh spinner](/static/img/swh-spinner.gif)
Computing file changes ...