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
ab8500-ext.c
/*
* Copyright (C) ST-Ericsson SA 2010
*
* License Terms: GNU General Public License v2
*
* Authors: Bengt Jonsson <bengt.g.jonsson@stericsson.com>
*
* This file is based on drivers/regulator/ab8500.c
*
* AB8500 external regulators
*
* ab8500-ext supports the following regulators:
* - VextSupply3
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#include <linux/mfd/abx500.h>
#include <linux/mfd/abx500/ab8500.h>
#include <linux/regulator/ab8500.h>
/**
* struct ab8500_ext_regulator_info - ab8500 regulator information
* @dev: device pointer
* @desc: regulator description
* @rdev: regulator device
* @cfg: regulator configuration (extension of regulator FW configuration)
* @update_bank: bank to control on/off
* @update_reg: register to control on/off
* @update_mask: mask to enable/disable and set mode of regulator
* @update_val: bits holding the regulator current mode
* @update_val_hp: bits to set EN pin active (LPn pin deactive)
* normally this means high power mode
* @update_val_lp: bits to set EN pin active and LPn pin active
* normally this means low power mode
* @update_val_hw: bits to set regulator pins in HW control
* SysClkReq pins and logic will choose mode
*/
struct ab8500_ext_regulator_info {
struct device *dev;
struct regulator_desc desc;
struct regulator_dev *rdev;
struct ab8500_ext_regulator_cfg *cfg;
u8 update_bank;
u8 update_reg;
u8 update_mask;
u8 update_val;
u8 update_val_hp;
u8 update_val_lp;
u8 update_val_hw;
};
static int ab8500_ext_regulator_enable(struct regulator_dev *rdev)
{
int ret;
struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev);
u8 regval;
if (info == NULL) {
dev_err(rdev_get_dev(rdev), "regulator info null pointer\n");
return -EINVAL;
}
/*
* To satisfy both HW high power request and SW request, the regulator
* must be on in high power.
*/
if (info->cfg && info->cfg->hwreq)
regval = info->update_val_hp;
else
regval = info->update_val;
ret = abx500_mask_and_set_register_interruptible(info->dev,
info->update_bank, info->update_reg,
info->update_mask, regval);
if (ret < 0) {
dev_err(rdev_get_dev(info->rdev),
"couldn't set enable bits for regulator\n");
return ret;
}
dev_dbg(rdev_get_dev(rdev),
"%s-enable (bank, reg, mask, value): 0x%02x, 0x%02x, 0x%02x, 0x%02x\n",
info->desc.name, info->update_bank, info->update_reg,
info->update_mask, regval);
return 0;
}
static int ab8500_ext_regulator_disable(struct regulator_dev *rdev)
{
int ret;
struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev);
u8 regval;
if (info == NULL) {
dev_err(rdev_get_dev(rdev), "regulator info null pointer\n");
return -EINVAL;
}
/*
* Set the regulator in HW request mode if configured
*/
if (info->cfg && info->cfg->hwreq)
regval = info->update_val_hw;
else
regval = 0;
ret = abx500_mask_and_set_register_interruptible(info->dev,
info->update_bank, info->update_reg,
info->update_mask, regval);
if (ret < 0) {
dev_err(rdev_get_dev(info->rdev),
"couldn't set disable bits for regulator\n");
return ret;
}
dev_dbg(rdev_get_dev(rdev), "%s-disable (bank, reg, mask, value):"
" 0x%02x, 0x%02x, 0x%02x, 0x%02x\n",
info->desc.name, info->update_bank, info->update_reg,
info->update_mask, regval);
return 0;
}
static int ab8500_ext_regulator_is_enabled(struct regulator_dev *rdev)
{
int ret;
struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev);
u8 regval;
if (info == NULL) {
dev_err(rdev_get_dev(rdev), "regulator info null pointer\n");
return -EINVAL;
}
ret = abx500_get_register_interruptible(info->dev,
info->update_bank, info->update_reg, ®val);
if (ret < 0) {
dev_err(rdev_get_dev(rdev),
"couldn't read 0x%x register\n", info->update_reg);
return ret;
}
dev_dbg(rdev_get_dev(rdev), "%s-is_enabled (bank, reg, mask, value):"
" 0x%02x, 0x%02x, 0x%02x, 0x%02x\n",
info->desc.name, info->update_bank, info->update_reg,
info->update_mask, regval);
if (((regval & info->update_mask) == info->update_val_lp) ||
((regval & info->update_mask) == info->update_val_hp))
return 1;
else
return 0;
}
static int ab8500_ext_regulator_set_mode(struct regulator_dev *rdev,
unsigned int mode)
{
int ret = 0;
struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev);
u8 regval;
if (info == NULL) {
dev_err(rdev_get_dev(rdev), "regulator info null pointer\n");
return -EINVAL;
}
switch (mode) {
case REGULATOR_MODE_NORMAL:
regval = info->update_val_hp;
break;
case REGULATOR_MODE_IDLE:
regval = info->update_val_lp;
break;
default:
return -EINVAL;
}
/* If regulator is enabled and info->cfg->hwreq is set, the regulator
must be on in high power, so we don't need to write the register with
the same value.
*/
if (ab8500_ext_regulator_is_enabled(rdev) &&
!(info->cfg && info->cfg->hwreq)) {
ret = abx500_mask_and_set_register_interruptible(info->dev,
info->update_bank, info->update_reg,
info->update_mask, regval);
if (ret < 0) {
dev_err(rdev_get_dev(rdev),
"Could not set regulator mode.\n");
return ret;
}
dev_dbg(rdev_get_dev(rdev),
"%s-set_mode (bank, reg, mask, value): "
"0x%x, 0x%x, 0x%x, 0x%x\n",
info->desc.name, info->update_bank, info->update_reg,
info->update_mask, regval);
}
info->update_val = regval;
return 0;
}
static unsigned int ab8500_ext_regulator_get_mode(struct regulator_dev *rdev)
{
struct ab8500_ext_regulator_info *info = rdev_get_drvdata(rdev);
int ret;
if (info == NULL) {
dev_err(rdev_get_dev(rdev), "regulator info null pointer\n");
return -EINVAL;
}
if (info->update_val == info->update_val_hp)
ret = REGULATOR_MODE_NORMAL;
else if (info->update_val == info->update_val_lp)
ret = REGULATOR_MODE_IDLE;
else
ret = -EINVAL;
return ret;
}
static int ab8500_ext_set_voltage(struct regulator_dev *rdev, int min_uV,
int max_uV, unsigned *selector)
{
struct regulation_constraints *regu_constraints = rdev->constraints;
if (!regu_constraints) {
dev_err(rdev_get_dev(rdev), "No regulator constraints\n");
return -EINVAL;
}
if (regu_constraints->min_uV == min_uV &&
regu_constraints->max_uV == max_uV)
return 0;
dev_err(rdev_get_dev(rdev),
"Requested min %duV max %duV != constrained min %duV max %duV\n",
min_uV, max_uV,
regu_constraints->min_uV, regu_constraints->max_uV);
return -EINVAL;
}
static int ab8500_ext_list_voltage(struct regulator_dev *rdev,
unsigned selector)
{
struct regulation_constraints *regu_constraints = rdev->constraints;
if (regu_constraints == NULL) {
dev_err(rdev_get_dev(rdev), "regulator constraints null pointer\n");
return -EINVAL;
}
/* return the uV for the fixed regulators */
if (regu_constraints->min_uV && regu_constraints->max_uV) {
if (regu_constraints->min_uV == regu_constraints->max_uV)
return regu_constraints->min_uV;
}
return -EINVAL;
}
static struct regulator_ops ab8500_ext_regulator_ops = {
.enable = ab8500_ext_regulator_enable,
.disable = ab8500_ext_regulator_disable,
.is_enabled = ab8500_ext_regulator_is_enabled,
.set_mode = ab8500_ext_regulator_set_mode,
.get_mode = ab8500_ext_regulator_get_mode,
.set_voltage = ab8500_ext_set_voltage,
.list_voltage = ab8500_ext_list_voltage,
};
static struct ab8500_ext_regulator_info
ab8500_ext_regulator_info[AB8500_NUM_EXT_REGULATORS] = {
[AB8500_EXT_SUPPLY1] = {
.desc = {
.name = "VEXTSUPPLY1",
.ops = &ab8500_ext_regulator_ops,
.type = REGULATOR_VOLTAGE,
.id = AB8500_EXT_SUPPLY1,
.owner = THIS_MODULE,
.n_voltages = 1,
},
.update_bank = 0x04,
.update_reg = 0x08,
.update_mask = 0x03,
.update_val = 0x01,
.update_val_hp = 0x01,
.update_val_lp = 0x03,
.update_val_hw = 0x02,
},
[AB8500_EXT_SUPPLY2] = {
.desc = {
.name = "VEXTSUPPLY2",
.ops = &ab8500_ext_regulator_ops,
.type = REGULATOR_VOLTAGE,
.id = AB8500_EXT_SUPPLY2,
.owner = THIS_MODULE,
.n_voltages = 1,
},
.update_bank = 0x04,
.update_reg = 0x08,
.update_mask = 0x0c,
.update_val = 0x04,
.update_val_hp = 0x04,
.update_val_lp = 0x0c,
.update_val_hw = 0x08,
},
[AB8500_EXT_SUPPLY3] = {
.desc = {
.name = "VEXTSUPPLY3",
.ops = &ab8500_ext_regulator_ops,
.type = REGULATOR_VOLTAGE,
.id = AB8500_EXT_SUPPLY3,
.owner = THIS_MODULE,
.n_voltages = 1,
},
.update_bank = 0x04,
.update_reg = 0x08,
.update_mask = 0x30,
.update_val = 0x10,
.update_val_hp = 0x10,
.update_val_lp = 0x30,
.update_val_hw = 0x20,
},
};
static struct of_regulator_match ab8500_ext_regulator_match[] = {
{ .name = "ab8500_ext1", .driver_data = (void *) AB8500_EXT_SUPPLY1, },
{ .name = "ab8500_ext2", .driver_data = (void *) AB8500_EXT_SUPPLY2, },
{ .name = "ab8500_ext3", .driver_data = (void *) AB8500_EXT_SUPPLY3, },
};
static int ab8500_ext_regulator_probe(struct platform_device *pdev)
{
struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
struct ab8500_platform_data *ppdata;
struct ab8500_regulator_platform_data *pdata;
struct device_node *np = pdev->dev.of_node;
struct regulator_config config = { };
int i, err;
if (np) {
err = of_regulator_match(&pdev->dev, np,
ab8500_ext_regulator_match,
ARRAY_SIZE(ab8500_ext_regulator_match));
if (err < 0) {
dev_err(&pdev->dev,
"Error parsing regulator init data: %d\n", err);
return err;
}
}
if (!ab8500) {
dev_err(&pdev->dev, "null mfd parent\n");
return -EINVAL;
}
ppdata = dev_get_platdata(ab8500->dev);
if (!ppdata) {
dev_err(&pdev->dev, "null parent pdata\n");
return -EINVAL;
}
pdata = ppdata->regulator;
if (!pdata) {
dev_err(&pdev->dev, "null pdata\n");
return -EINVAL;
}
/* make sure the platform data has the correct size */
if (pdata->num_ext_regulator != ARRAY_SIZE(ab8500_ext_regulator_info)) {
dev_err(&pdev->dev, "Configuration error: size mismatch.\n");
return -EINVAL;
}
/* check for AB8500 2.x */
if (is_ab8500_2p0_or_earlier(ab8500)) {
struct ab8500_ext_regulator_info *info;
/* VextSupply3LPn is inverted on AB8500 2.x */
info = &ab8500_ext_regulator_info[AB8500_EXT_SUPPLY3];
info->update_val = 0x30;
info->update_val_hp = 0x30;
info->update_val_lp = 0x10;
}
/* register all regulators */
for (i = 0; i < ARRAY_SIZE(ab8500_ext_regulator_info); i++) {
struct ab8500_ext_regulator_info *info = NULL;
/* assign per-regulator data */
info = &ab8500_ext_regulator_info[i];
info->dev = &pdev->dev;
info->cfg = (struct ab8500_ext_regulator_cfg *)
pdata->ext_regulator[i].driver_data;
config.dev = &pdev->dev;
config.driver_data = info;
config.of_node = ab8500_ext_regulator_match[i].of_node;
config.init_data = (np) ?
ab8500_ext_regulator_match[i].init_data :
&pdata->ext_regulator[i];
/* register regulator with framework */
info->rdev = devm_regulator_register(&pdev->dev, &info->desc,
&config);
if (IS_ERR(info->rdev)) {
err = PTR_ERR(info->rdev);
dev_err(&pdev->dev, "failed to register regulator %s\n",
info->desc.name);
return err;
}
dev_dbg(rdev_get_dev(info->rdev),
"%s-probed\n", info->desc.name);
}
return 0;
}
static struct platform_driver ab8500_ext_regulator_driver = {
.probe = ab8500_ext_regulator_probe,
.driver = {
.name = "ab8500-ext-regulator",
.owner = THIS_MODULE,
},
};
static int __init ab8500_ext_regulator_init(void)
{
int ret;
ret = platform_driver_register(&ab8500_ext_regulator_driver);
if (ret)
pr_err("Failed to register ab8500 ext regulator: %d\n", ret);
return ret;
}
subsys_initcall(ab8500_ext_regulator_init);
static void __exit ab8500_ext_regulator_exit(void)
{
platform_driver_unregister(&ab8500_ext_regulator_driver);
}
module_exit(ab8500_ext_regulator_exit);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Bengt Jonsson <bengt.g.jonsson@stericsson.com>");
MODULE_DESCRIPTION("AB8500 external regulator driver");
MODULE_ALIAS("platform:ab8500-ext-regulator");
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