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path: root/kernel/Kconfig.freezer

Age	Commit message (Collapse)	Author
2008-10-20	container freezer: implement freezer cgroup subsystem	Matt Helsley
	This patch implements a new freezer subsystem in the control groups framework. It provides a way to stop and resume execution of all tasks in a cgroup by writing in the cgroup filesystem. The freezer subsystem in the container filesystem defines a file named freezer.state. Writing "FROZEN" to the state file will freeze all tasks in the cgroup. Subsequently writing "RUNNING" will unfreeze the tasks in the cgroup. Reading will return the current state. * Examples of usage : # mkdir /containers/freezer # mount -t cgroup -ofreezer freezer /containers # mkdir /containers/0 # echo $some_pid > /containers/0/tasks to get status of the freezer subsystem : # cat /containers/0/freezer.state RUNNING to freeze all tasks in the container : # echo FROZEN > /containers/0/freezer.state # cat /containers/0/freezer.state FREEZING # cat /containers/0/freezer.state FROZEN to unfreeze all tasks in the container : # echo RUNNING > /containers/0/freezer.state # cat /containers/0/freezer.state RUNNING This is the basic mechanism which should do the right thing for user space task in a simple scenario. It's important to note that freezing can be incomplete. In that case we return EBUSY. This means that some tasks in the cgroup are busy doing something that prevents us from completely freezing the cgroup at this time. After EBUSY, the cgroup will remain partially frozen -- reflected by freezer.state reporting "FREEZING" when read. The state will remain "FREEZING" until one of these things happens: 1) Userspace cancels the freezing operation by writing "RUNNING" to the freezer.state file 2) Userspace retries the freezing operation by writing "FROZEN" to the freezer.state file (writing "FREEZING" is not legal and returns EIO) 3) The tasks that blocked the cgroup from entering the "FROZEN" state disappear from the cgroup's set of tasks. [akpm@linux-foundation.org: coding-style fixes] [akpm@linux-foundation.org: export thaw_process] Signed-off-by: Cedric Le Goater <clg@fr.ibm.com> Signed-off-by: Matt Helsley <matthltc@us.ibm.com> Acked-by: Serge E. Hallyn <serue@us.ibm.com> Tested-by: Matt Helsley <matthltc@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

generated by cgit v1.2.3 (git 2.25.1) at 2024-09-06 07:18:59 +0000

/*
 * Sonics Silicon Backplane
 * SDIO-Hostbus related functions
 *
 * Copyright 2009 Albert Herranz <albert_herranz@yahoo.es>
 *
 * Based on drivers/ssb/pcmcia.c
 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
 * Copyright 2007-2008 Michael Buesch <m@bues.ch>
 *
 * Licensed under the GNU/GPL. See COPYING for details.
 *
 */

#include "ssb_private.h"

#include <linux/ssb/ssb.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/etherdevice.h>
#include <linux/mmc/sdio_func.h>

/* Define the following to 1 to enable a printk on each coreswitch. */
#define SSB_VERBOSE_SDIOCORESWITCH_DEBUG		0


/* Hardware invariants CIS tuples */
#define SSB_SDIO_CIS			0x80
#define  SSB_SDIO_CIS_SROMREV		0x00
#define  SSB_SDIO_CIS_ID		0x01
#define  SSB_SDIO_CIS_BOARDREV		0x02
#define  SSB_SDIO_CIS_PA		0x03
#define   SSB_SDIO_CIS_PA_PA0B0_LO	0
#define   SSB_SDIO_CIS_PA_PA0B0_HI	1
#define   SSB_SDIO_CIS_PA_PA0B1_LO	2
#define   SSB_SDIO_CIS_PA_PA0B1_HI	3
#define   SSB_SDIO_CIS_PA_PA0B2_LO	4
#define   SSB_SDIO_CIS_PA_PA0B2_HI	5
#define   SSB_SDIO_CIS_PA_ITSSI		6
#define   SSB_SDIO_CIS_PA_MAXPOW	7
#define  SSB_SDIO_CIS_OEMNAME		0x04
#define  SSB_SDIO_CIS_CCODE		0x05
#define  SSB_SDIO_CIS_ANTENNA		0x06
#define  SSB_SDIO_CIS_ANTGAIN		0x07
#define  SSB_SDIO_CIS_BFLAGS		0x08
#define  SSB_SDIO_CIS_LEDS		0x09

#define CISTPL_FUNCE_LAN_NODE_ID        0x04	/* same as in PCMCIA */


/*
 * Function 1 miscellaneous registers.
 *
 * Definitions match src/include/sbsdio.h from the
 * Android Open Source Project
 * http://android.git.kernel.org/?p=platform/system/wlan/broadcom.git
 *
 */
#define SBSDIO_FUNC1_SBADDRLOW	0x1000a	/* SB Address window Low (b15) */
#define SBSDIO_FUNC1_SBADDRMID	0x1000b	/* SB Address window Mid (b23-b16) */
#define SBSDIO_FUNC1_SBADDRHIGH	0x1000c	/* SB Address window High (b24-b31) */

/* valid bits in SBSDIO_FUNC1_SBADDRxxx regs */
#define SBSDIO_SBADDRLOW_MASK	0x80	/* Valid address bits in SBADDRLOW */
#define SBSDIO_SBADDRMID_MASK	0xff	/* Valid address bits in SBADDRMID */
#define SBSDIO_SBADDRHIGH_MASK	0xff	/* Valid address bits in SBADDRHIGH */

#define SBSDIO_SB_OFT_ADDR_MASK	0x7FFF	/* sb offset addr is <= 15 bits, 32k */

/* REVISIT: this flag doesn't seem to matter */
#define SBSDIO_SB_ACCESS_2_4B_FLAG	0x8000	/* forces 32-bit SB access */


/*
 * Address map within the SDIO function address space (128K).
 *
 *   Start   End     Description
 *   ------- ------- ------------------------------------------
 *   0x00000 0x0ffff selected backplane address window (64K)
 *   0x10000 0x1ffff backplane control registers (max 64K)
 *
 * The current address window is configured by writing to registers
 * SBADDRLOW, SBADDRMID and SBADDRHIGH.
 *
 * In order to access the contents of a 32-bit Silicon Backplane address
 * the backplane address window must be first loaded with the highest
 * 16 bits of the target address. Then, an access must be done to the
 * SDIO function address space using the lower 15 bits of the address.
 * Bit 15 of the address must be set when doing 32 bit accesses.
 *
 * 10987654321098765432109876543210
 * WWWWWWWWWWWWWWWWW                 SB Address Window
 *                 OOOOOOOOOOOOOOOO  Offset within SB Address Window
 *                 a                 32-bit access flag
 */


/*
 * SSB I/O via SDIO.
 *
 * NOTE: SDIO address @addr is 17 bits long (SDIO address space is 128K).
 */

static inline struct device *ssb_sdio_dev(struct ssb_bus *bus)
{
	return &bus->host_sdio->dev;
}

/* host claimed */
static int ssb_sdio_writeb(struct ssb_bus *bus, unsigned int addr, u8 val)
{
	int error = 0;

	sdio_writeb(bus->host_sdio, val, addr, &error);
	if (unlikely(error)) {
		dev_dbg(ssb_sdio_dev(bus), "%08X <- %02x, error %d\n",
			addr, val, error);
	}

	return error;
}

#if 0
static u8 ssb_sdio_readb(struct ssb_bus *bus, unsigned int addr)
{
	u8 val;
	int error = 0;

	val = sdio_readb(bus->host_sdio, addr, &error);
	if (unlikely(error)) {
		dev_dbg(ssb_sdio_dev(bus), "%08X -> %02x, error %d\n",
			addr, val, error);
	}

	return val;
}
#endif

/* host claimed */
static int ssb_sdio_set_sbaddr_window(struct ssb_bus *bus, u32 address)
{
	int error;

	error = ssb_sdio_writeb(bus, SBSDIO_FUNC1_SBADDRLOW,
				(address >> 8) & SBSDIO_SBADDRLOW_MASK);
	if (error)
		goto out;
	error = ssb_sdio_writeb(bus, SBSDIO_FUNC1_SBADDRMID,
				(address >> 16) & SBSDIO_SBADDRMID_MASK);
	if (error)
		goto out;
	error = ssb_sdio_writeb(bus, SBSDIO_FUNC1_SBADDRHIGH,
				(address >> 24) & SBSDIO_SBADDRHIGH_MASK);
	if (error)
		goto out;
	bus->sdio_sbaddr = address;
out:
	if (error) {
		dev_dbg(ssb_sdio_dev(bus), "failed to set address window"
			" to 0x%08x, error %d\n", address, error);
	}

	return error;
}

/* for enumeration use only */
u32 ssb_sdio_scan_read32(struct ssb_bus *bus, u16 offset)
{
	u32 val;
	int error;

	sdio_claim_host(bus->host_sdio);
	val = sdio_readl(bus->host_sdio, offset, &error);
	sdio_release_host(bus->host_sdio);
	if (unlikely(error)) {
		dev_dbg(ssb_sdio_dev(bus), "%04X:%04X > %08x, error %d\n",
			bus->sdio_sbaddr >> 16, offset, val, error);
	}

	return val;
}

/* for enumeration use only */
int ssb_sdio_scan_switch_coreidx(struct ssb_bus *bus, u8 coreidx)
{
	u32 sbaddr;
	int error;

	sbaddr = (coreidx * SSB_CORE_SIZE) + SSB_ENUM_BASE;
	sdio_claim_host(bus->host_sdio);
	error = ssb_sdio_set_sbaddr_window(bus, sbaddr);
	sdio_release_host(bus->host_sdio);
	if (error) {
		dev_err(ssb_sdio_dev(bus), "failed to switch to core %u,"
			" error %d\n", coreidx, error);
		goto out;
	}
out:
	return error;
}

/* host must be already claimed */
static int ssb_sdio_switch_core(struct ssb_bus *bus, struct ssb_device *dev)
{
	u8 coreidx = dev->core_index;
	u32 sbaddr;
	int error = 0;

	sbaddr = (coreidx * SSB_CORE_SIZE) + SSB_ENUM_BASE;
	if (unlikely(bus->sdio_sbaddr != sbaddr)) {
#if SSB_VERBOSE_SDIOCORESWITCH_DEBUG
		dev_info(ssb_sdio_dev(bus),
			   "switching to %s core, index %d\n",
			   ssb_core_name(dev->id.coreid), coreidx);
#endif
		error = ssb_sdio_set_sbaddr_window(bus, sbaddr);
		if (error) {
			dev_dbg(ssb_sdio_dev(bus), "failed to switch to"
				" core %u, error %d\n", coreidx, error);
			goto out;
		}
		bus->mapped_device = dev;
	}

out:
	return error;
}

static u8 ssb_sdio_read8(struct ssb_device *dev, u16 offset)
{
	struct ssb_bus *bus = dev->bus;
	u8 val = 0xff;
	int error = 0;

	sdio_claim_host(bus->host_sdio);
	if (unlikely(ssb_sdio_switch_core(bus, dev)))
		goto out;
	offset |= bus->sdio_sbaddr & 0xffff;
	offset &= SBSDIO_SB_OFT_ADDR_MASK;
	val = sdio_readb(bus->host_sdio, offset, &error);
	if (error) {
		dev_dbg(ssb_sdio_dev(bus), "%04X:%04X > %02x, error %d\n",
			bus->sdio_sbaddr >> 16, offset, val, error);
	}
out:
	sdio_release_host(bus->host_sdio);

	return val;
}

static u16 ssb_sdio_read16(struct ssb_device *dev, u16 offset)
{
	struct ssb_bus *bus = dev->bus;
	u16 val = 0xffff;
	int error = 0;

	sdio_claim_host(bus->host_sdio);
	if (unlikely(ssb_sdio_switch_core(bus, dev)))
		goto out;
	offset |= bus->sdio_sbaddr & 0xffff;
	offset &= SBSDIO_SB_OFT_ADDR_MASK;
	val = sdio_readw(bus->host_sdio, offset, &error);
	if (error) {
		dev_dbg(ssb_sdio_dev(bus), "%04X:%04X > %04x, error %d\n",
			bus->sdio_sbaddr >> 16, offset, val, error);
	}
out:
	sdio_release_host(bus->host_sdio);

	return val;
}

static u32 ssb_sdio_read32(struct ssb_device *dev, u16 offset)
{
	struct ssb_bus *bus = dev->bus;
	u32 val = 0xffffffff;
	int error = 0;

	sdio_claim_host(bus->host_sdio);
	if (unlikely(ssb_sdio_switch_core(bus, dev)))
		goto out;
	offset |= b