android/android_kernel_cmhtcleo
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Merge branch 'ics_HWA' into jellybean

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Conflicts:
	arch/arm/configs/htcleo_defconfig
	drivers/staging/android/lowmemorykiller.c
This commit is contained in:
securecrt 2012-08-23 12:57:17 +08:00
commit 1160ee1202
27 changed files with 1472 additions and 246 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
arch/arm/configs/htcleo_defconfig
View File

@ -1,7 +1,7 @@
#
# Automatically generated make config: don't edit
# Linux kernel version: 2.6.32-ics
# Fri Jun 1 01:10:03 CST 2012
# Fri Aug 1 01:10:03 CST 2012
#
CONFIG_ARM=y
CONFIG_SYS_SUPPORTS_APM_EMULATION=y
@ -401,7 +401,7 @@ CONFIG_BOUNCE=y
CONFIG_VIRT_TO_BUS=y
CONFIG_HAVE_MLOCK=y
CONFIG_HAVE_MLOCKED_PAGE_BIT=y
CONFIG_KSM=y
# CONFIG_KSM is not set
CONFIG_DEFAULT_MMAP_MIN_ADDR=4096
CONFIG_ALIGNMENT_TRAP=y
CONFIG_ALLOW_CPU_ALIGNMENT=y
@ -604,7 +604,6 @@ CONFIG_NETFILTER_XT_CONNMARK=y
#
CONFIG_NETFILTER_XT_TARGET_CLASSIFY=y
CONFIG_NETFILTER_XT_TARGET_CONNMARK=y
# CONFIG_NETFILTER_XT_TARGET_CT is not set
# CONFIG_NETFILTER_XT_TARGET_DSCP is not set
# CONFIG_NETFILTER_XT_TARGET_HL is not set
CONFIG_NETFILTER_XT_TARGET_MARK=y
@ -632,7 +631,7 @@ CONFIG_NETFILTER_XT_MATCH_CONNTRACK=y
# CONFIG_NETFILTER_XT_MATCH_ESP is not set
CONFIG_NETFILTER_XT_MATCH_HASHLIMIT=y
CONFIG_NETFILTER_XT_MATCH_HELPER=y
CONFIG_NETFILTER_XT_MATCH_HL=y
# CONFIG_NETFILTER_XT_MATCH_HL is not set
CONFIG_NETFILTER_XT_MATCH_IPRANGE=y
CONFIG_NETFILTER_XT_MATCH_LENGTH=y
CONFIG_NETFILTER_XT_MATCH_LIMIT=y
@ -1698,6 +1697,10 @@ CONFIG_ZRAM_NUM_DEVICES=1
CONFIG_ZRAM_DEFAULT_PERCENTAGE=18
# CONFIG_ZRAM_DEBUG is not set
CONFIG_ZRAM_DEFAULT_DISKSIZE=100000000
# CONFIG_ZRAM_LZO is not set
CONFIG_ZRAM_SNAPPY=y
CONFIG_SNAPPY_COMPRESS=y
CONFIG_SNAPPY_DECOMPRESS=y
#
# File systems

167
drivers/mmc/host/msm_sdcc.c Normal file → Executable file
View File

@ -73,7 +73,7 @@ static int msmsdcc_auto_suspend(struct mmc_host *, int);
#define BUSCLK_TIMEOUT (HZ)
#define SQN_BUSCLK_TIMEOUT (5 * HZ)
static unsigned int msmsdcc_fmin = 144000;
static unsigned int msmsdcc_fmax = 50000000;
static unsigned int msmsdcc_fmax = 64000000;
static unsigned int msmsdcc_4bit = 1;
static unsigned int msmsdcc_pwrsave = 1;
static unsigned int msmsdcc_piopoll = 1;
@ -308,42 +308,40 @@ msmsdcc_dma_exec_func(struct msm_dmov_cmd *cmd)
}
static void
msmsdcc_dma_complete_func(struct msm_dmov_cmd *cmd,
unsigned int result,
struct msm_dmov_errdata *err)
msmsdcc_dma_complete_tlet(unsigned long data)
{
struct msmsdcc_dma_data *dma_data =
container_of(cmd, struct msmsdcc_dma_data, hdr);
struct msmsdcc_host *host = dma_data->host;
struct msmsdcc_host *host = (struct msmsdcc_host *)data;
unsigned long flags;
struct mmc_request *mrq;
struct msm_dmov_errdata err;
spin_lock_irqsave(&host->lock, flags);
host->dma.active = 0;
err = host->dma.err;
mrq = host->curr.mrq;
BUG_ON(!mrq);
WARN_ON(!mrq->data);
if (!(result & DMOV_RSLT_VALID)) {
if (!(host->dma.result & DMOV_RSLT_VALID)) {
pr_err("msmsdcc: Invalid DataMover result\n");
goto out;
}
if (result & DMOV_RSLT_DONE) {
if (host->dma.result & DMOV_RSLT_DONE) {
host->curr.data_xfered = host->curr.xfer_size;
} else {
/* Error or flush */
if (result & DMOV_RSLT_ERROR)
if (host->dma.result & DMOV_RSLT_ERROR)
pr_err("%s: DMA error (0x%.8x)\n",
mmc_hostname(host->mmc), result);
if (result & DMOV_RSLT_FLUSH)
mmc_hostname(host->mmc), host->dma.result);
if (host->dma.result & DMOV_RSLT_FLUSH)
pr_err("%s: DMA channel flushed (0x%.8x)\n",
mmc_hostname(host->mmc), result);
if (err)
mmc_hostname(host->mmc), host->dma.result);
pr_err("Flush data: %.8x %.8x %.8x %.8x %.8x %.8x\n",
err->flush[0], err->flush[1], err->flush[2],
err->flush[3], err->flush[4], err->flush[5]);
err.flush[0], err.flush[1], err.flush[2],
err.flush[3], err.flush[4], err.flush[5]);
if (!mrq->data->error)
mrq->data->error = -EIO;
}
@ -391,6 +389,22 @@ out:
return;
}
static void
msmsdcc_dma_complete_func(struct msm_dmov_cmd *cmd,
unsigned int result,
struct msm_dmov_errdata *err)
{
struct msmsdcc_dma_data *dma_data =
container_of(cmd, struct msmsdcc_dma_data, hdr);
struct msmsdcc_host *host = dma_data->host;
dma_data->result = result;
if (err)
memcpy(&dma_data->err, err, sizeof(struct msm_dmov_errdata));
tasklet_schedule(&host->dma_tlet);
}
static int validate_dma(struct msmsdcc_host *host, struct mmc_data *data)
{
if (host->dma.channel == -1)
@ -451,14 +465,30 @@ static int msmsdcc_config_dma(struct msmsdcc_host *host, struct mmc_data *data)
host->curr.user_pages = 0;
box = &nc->cmd[0];
for (i = 0; i < host->dma.num_ents; i++) {
/* location of command block must be 64 bit aligned */
BUG_ON(host->dma.cmd_busaddr & 0x07);
nc->cmdptr = (host->dma.cmd_busaddr >> 3) | CMD_PTR_LP;
host->dma.hdr.cmdptr = DMOV_CMD_PTR_LIST |
DMOV_CMD_ADDR(host->dma.cmdptr_busaddr);
host->dma.hdr.complete_func = msmsdcc_dma_complete_func;
n = dma_map_sg(mmc_dev(host->mmc), host->dma.sg,
host->dma.num_ents, host->dma.dir);
if (n == 0) {
printk(KERN_ERR "%s: Unable to map in all sg elements\n",
mmc_hostname(host->mmc));
host->dma.sg = NULL;
host->dma.num_ents = 0;
return -ENOMEM;
}
for_each_sg(host->dma.sg, sg, n, i) {
box->cmd = CMD_MODE_BOX;
/* Initialize sg dma address */
sg->dma_address = page_to_dma(mmc_dev(host->mmc), sg_page(sg))
+ sg->offset;
if (i == (host->dma.num_ents - 1))
if (i == n - 1)
box->cmd |= CMD_LC;
rows = (sg_dma_len(sg) % MCI_FIFOSIZE) ?
(sg_dma_len(sg) / MCI_FIFOSIZE) + 1 :
@ -486,27 +516,6 @@ static int msmsdcc_config_dma(struct msmsdcc_host *host, struct mmc_data *data)
box->cmd |= CMD_DST_CRCI(crci);
}
box++;
sg++;
}
/* location of command block must be 64 bit aligned */
BUG_ON(host->dma.cmd_busaddr & 0x07);
nc->cmdptr = (host->dma.cmd_busaddr >> 3) | CMD_PTR_LP;
host->dma.hdr.cmdptr = DMOV_CMD_PTR_LIST |
DMOV_CMD_ADDR(host->dma.cmdptr_busaddr);
host->dma.hdr.complete_func = msmsdcc_dma_complete_func;
n = dma_map_sg(mmc_dev(host->mmc), host->dma.sg,
host->dma.num_ents, host->dma.dir);
/* dsb inside dma_map_sg will write nc out to mem as well */
if (n != host->dma.num_ents) {
printk(KERN_ERR "%s: Unable to map in all sg elements\n",
mmc_hostname(host->mmc));
host->dma.sg = NULL;
host->dma.num_ents = 0;
return -ENOMEM;
}
return 0;
@ -542,6 +551,11 @@ msmsdcc_start_command_deferred(struct msmsdcc_host *host,
(cmd->opcode == 53))
*c |= MCI_CSPM_DATCMD;
if (host->prog_scan && (cmd->opcode == 12)) {
*c |= MCI_CPSM_PROGENA;
host->prog_enable = true;
}
if (cmd == cmd->mrq->stop)
*c |= MCI_CSPM_MCIABORT;
@ -612,6 +626,8 @@ msmsdcc_start_data(struct msmsdcc_host *host, struct mmc_data *data,
}
dsb();
msm_dmov_enqueue_cmd_ext(host->dma.channel, &host->dma.hdr);
if (data->flags & MMC_DATA_WRITE)
host->prog_scan = true;
} else {
msmsdcc_writel(host, timeout, MMCIDATATIMER);
@ -701,6 +717,9 @@ msmsdcc_pio_read(struct msmsdcc_host *host, char *buffer, unsigned int remain)
count += remain;
}else
#endif
if (remain % 4)
remain = ((remain >> 2) + 1) << 2;
while (msmsdcc_readl(host, MMCISTATUS) & MCI_RXDATAAVLBL) {
*ptr = msmsdcc_readl(host, MMCIFIFO + (count % MCI_FIFOSIZE));
ptr++;
@ -737,13 +756,14 @@ msmsdcc_pio_write(struct msmsdcc_host *host, char *buffer,
} else {
#endif
do {
unsigned int count, maxcnt;
unsigned int count, maxcnt, sz;
maxcnt = status & MCI_TXFIFOEMPTY ? MCI_FIFOSIZE :
MCI_FIFOHALFSIZE;
count = min(remain, maxcnt);
writesl(base + MMCIFIFO, ptr, count >> 2);
sz = count % 4 ? (count >> 2) + 1 : (count >> 2);
writesl(base + MMCIFIFO, ptr, sz);
ptr += count;
remain -= count;
@ -906,8 +926,23 @@ static void msmsdcc_do_cmdirq(struct msmsdcc_host *host, uint32_t status)
else if (host->curr.data) { /* Non DMA */
msmsdcc_stop_data(host);
msmsdcc_request_end(host, cmd->mrq);
} else /* host->data == NULL */
} else { /* host->data == NULL */
if (!cmd->error && host->prog_enable) {
if (status & MCI_PROGDONE) {
host->prog_scan = false;
host->prog_enable = false;
msmsdcc_request_end(host, cmd->mrq);
} else {
host->curr.cmd = cmd;
}
} else {
if (host->prog_enable) {
host->prog_scan = false;
host->prog_enable = false;
}
msmsdcc_request_end(host, cmd->mrq);
}
}
} else if (cmd->data)
if (!(cmd->data->flags & MMC_DATA_READ))
msmsdcc_start_data(host, cmd->data,
@ -921,7 +956,7 @@ msmsdcc_handle_irq_data(struct msmsdcc_host *host, u32 status,
struct mmc_data *data = host->curr.data;
if (status & (MCI_CMDSENT | MCI_CMDRESPEND | MCI_CMDCRCFAIL |
MCI_CMDTIMEOUT) && host->curr.cmd) {
MCI_CMDTIMEOUT | MCI_PROGDONE) && host->curr.cmd) {
msmsdcc_do_cmdirq(host, status);
}
@ -1265,24 +1300,6 @@ msmsdcc_init_dma(struct msmsdcc_host *host)
return 0;
}
#ifdef CONFIG_MMC_MSM7X00A_RESUME_IN_WQ
static void
do_resume_work(struct work_struct *work)
{
struct msmsdcc_host *host =
container_of(work, struct msmsdcc_host, resume_task);
struct mmc_host *mmc = host->mmc;
if (mmc) {
mmc_resume_host(mmc);
if (host->stat_irq)
enable_irq(host->stat_irq);
}
}
#endif
#ifdef CONFIG_HAS_EARLYSUSPEND
static void msmsdcc_early_suspend(struct early_suspend *h)
{
@ -1382,14 +1399,8 @@ msmsdcc_probe(struct platform_device *pdev)
host->dmares = dmares;
spin_lock_init(&host->lock);
#ifdef CONFIG_MMC_EMBEDDED_SDIO
if (plat->embedded_sdio)
mmc_set_embedded_sdio_data(mmc,
&plat->embedded_sdio->cis,
&plat->embedded_sdio->cccr,
plat->embedded_sdio->funcs,
plat->embedded_sdio->num_funcs);
#endif
tasklet_init(&host->dma_tlet, msmsdcc_dma_complete_tlet,
(unsigned long)host);
/*
* Setup DMA
@ -1608,22 +1619,14 @@ msmsdcc_resume(struct platform_device *dev)
msmsdcc_writel(host, host->saved_irq0mask, MMCIMASK0);
if (mmc->card && mmc->card->type != MMC_TYPE_SDIO) {
#ifdef CONFIG_MMC_MSM7X00A_RESUME_IN_WQ
schedule_work(&host->resume_task);
#else
if (mmc->card && mmc->card->type != MMC_TYPE_SDIO)
mmc_resume_host(mmc);
#endif
}
if (host->stat_irq)
enable_irq(host->stat_irq);
#if BUSCLK_PWRSAVE
if (host->clks_on)
msmsdcc_disable_clocks(host, 1);
#endif
}
return 0;
}

13
drivers/mmc/host/msm_sdcc.h Normal file → Executable file
View File

@ -155,7 +155,7 @@
#define MCI_IRQENABLE \
(MCI_CMDCRCFAILMASK|MCI_DATACRCFAILMASK|MCI_CMDTIMEOUTMASK| \
MCI_DATATIMEOUTMASK|MCI_TXUNDERRUNMASK|MCI_RXOVERRUNMASK| \
MCI_CMDRESPENDMASK|MCI_CMDSENTMASK|MCI_DATAENDMASK)
MCI_CMDRESPENDMASK|MCI_CMDSENTMASK|MCI_DATAENDMASK|MCI_PROGDONEMASK)
/*
* The size of the FIFO in bytes.
@ -164,7 +164,7 @@
#define MCI_FIFOHALFSIZE (MCI_FIFOSIZE / 2)
#define NR_SG 32
#define NR_SG 128
struct clk;
@ -190,7 +190,7 @@ struct msmsdcc_dma_data {
int busy; /* Set if DM is busy */
int active;
unsigned int result;
struct msm_dmov_errdata *err;
struct msm_dmov_errdata err;
};
struct msmsdcc_pio_data {
@ -258,17 +258,12 @@ struct msmsdcc_host {
int polling_enabled;
#endif
#ifdef CONFIG_MMC_MSM7X00A_RESUME_IN_WQ
struct work_struct resume_task;
#endif
struct tasklet_struct dma_tlet;
#ifdef CONFIG_MMC_AUTO_SUSPEND
unsigned long suspended;
#endif
unsigned int prog_scan;
unsigned int prog_enable;
/* Command parameters */
unsigned int cmd_timeout;
unsigned int cmd_pio_irqmask;
@ -279,6 +274,8 @@ struct msmsdcc_host {
unsigned int dummy_52_needed;
unsigned int dummy_52_state;
bool prog_scan;
bool prog_enable;
};
#endif

2
drivers/staging/Kconfig Normal file → Executable file
View File

@ -125,5 +125,7 @@ source "drivers/staging/iio/Kconfig"
source "drivers/staging/zram/Kconfig"
source "drivers/staging/snappy/Kconfig"
endif # !STAGING_EXCLUDE_BUILD
endif # STAGING

3
drivers/staging/Makefile Normal file → Executable file
View File

@ -45,4 +45,5 @@ obj-$(CONFIG_DX_SEP) += sep/
obj-$(CONFIG_IIO) += iio/
obj-$(CONFIG_ZRAM) += zram/
obj-$(CONFIG_XVMALLOC) += zram/
obj-$(CONFIG_SNAPPY_COMPRESS) += snappy/
obj-$(CONFIG_SNAPPY_DECOMPRESS) += snappy/

0
drivers/staging/android/binder.c Normal file → Executable file
View File

0
drivers/staging/android/logger.c Normal file → Executable file
View File

0
drivers/staging/android/logger.h Normal file → Executable file
View File

29
drivers/staging/android/lowmemorykiller.c Normal file → Executable file
View File

@ -40,6 +40,14 @@
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
<<<<<<< HEAD
=======
#ifdef CONFIG_SWAP
#include <linux/fs.h>
#include <linux/swap.h>
#endif
>>>>>>> ics_HWA
static uint32_t lowmem_debug_level = 2;
static int lowmem_adj[6] = {
@ -64,6 +72,10 @@ static struct task_struct *lowmem_deathpending;
static unsigned long lowmem_deathpending_timeout;
static struct kobject *lowmem_kobj;
#ifdef CONFIG_SWAP
static int fudgeswap = 512;
#endif
#define lowmem_print(level, x...) \
do { \
if (lowmem_debug_level >= (level)) \
@ -112,8 +124,6 @@ static int lmk_hotplug_callback(struct notifier_block *self,
}
#endif
static void lowmem_notify_killzone_approach(void);
static inline void get_free_ram(int *other_free, int *other_file)
@ -122,7 +132,19 @@ static inline void get_free_ram(int *other_free, int *other_file)
*other_free = global_page_state(NR_FREE_PAGES);
*other_file = global_page_state(NR_FILE_PAGES) -
global_page_state(NR_SHMEM);
#ifdef CONFIG_SWAP
if(fudgeswap != 0){
struct sysinfo si;
si_swapinfo(&si);
if(si.freeswap > 0){
if(fudgeswap > si.freeswap)
other_file += si.freeswap;
else
other_file += fudgeswap;
}
}
#endif
if (offlining) {
/* Discount all free space in the section being offlined */
for_each_zone(zone) {
@ -347,6 +369,9 @@ module_param_named(debug_level, lowmem_debug_level, uint, S_IRUGO | S_IWUSR);
module_param_named(notify_trigger, lowmem_minfree_notif_trigger, uint,
S_IRUGO | S_IWUSR);
#ifdef CONFIG_SWAP
module_param_named(fudgeswap, fudgeswap, int, S_IRUGO | S_IWUSR);
#endif
module_init(lowmem_init);
module_exit(lowmem_exit);

5
drivers/staging/snappy/Kconfig Executable file
View File

@ -0,0 +1,5 @@
config SNAPPY_COMPRESS
tristate "Google Snappy Compression"
config SNAPPY_DECOMPRESS
tristate "Google Snappy Decompression"

5
drivers/staging/snappy/Makefile Executable file
View File

@ -0,0 +1,5 @@
snappy_compress-objs := csnappy_compress.o
snappy_decompress-objs := csnappy_decompress.o
obj-$(CONFIG_SNAPPY_COMPRESS) += csnappy_compress.o
obj-$(CONFIG_SNAPPY_DECOMPRESS) += csnappy_decompress.o

125
drivers/staging/snappy/csnappy.h Executable file
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@ -0,0 +1,125 @@
#ifndef __CSNAPPY_H__
#define __CSNAPPY_H__
/*
File modified for the Linux Kernel by
Zeev Tarantov <zeev.tarantov at gmail.com>
*/
#ifdef __cplusplus
extern "C" {
#endif
#define CSNAPPY_VERSION 4
#define CSNAPPY_WORKMEM_BYTES_POWER_OF_TWO 15
#define CSNAPPY_WORKMEM_BYTES (1 << CSNAPPY_WORKMEM_BYTES_POWER_OF_TWO)
/*
* Returns the maximal size of the compressed representation of
* input data that is "source_len" bytes in length;
*/
uint32_t
csnappy_max_compressed_length(uint32_t source_len) __attribute__((const));
/*
* Flat array compression that does not emit the "uncompressed length"
* prefix. Compresses "input" array to the "output" array.
*
* REQUIRES: "input" is at most 32KiB long.
* REQUIRES: "output" points to an array of memory that is at least
* "csnappy_max_compressed_length(input_length)" in size.
* REQUIRES: working_memory has (1 << workmem_bytes_power_of_two) bytes.
* REQUIRES: 9 <= workmem_bytes_power_of_two <= 15.
*
* Returns an "end" pointer into "output" buffer.
* "end - output" is the compressed size of "input".
*/
char*
csnappy_compress_fragment(
const char *input,
const uint32_t input_length,
char *output,
void *working_memory,
const int workmem_bytes_power_of_two);
/*
* REQUIRES: "compressed" must point to an area of memory that is at
* least "csnappy_max_compressed_length(input_length)" bytes in length.
* REQUIRES: working_memory has (1 << workmem_bytes_power_of_two) bytes.
* REQUIRES: 9 <= workmem_bytes_power_of_two <= 15.
*
* Takes the data stored in "input[0..input_length]" and stores
* it in the array pointed to by "compressed".
*
* "*out_compressed_length" is set to the length of the compressed output.
*/
void
csnappy_compress(
const char *input,
uint32_t input_length,
char *compressed,
uint32_t *out_compressed_length,
void *working_memory,
const int workmem_bytes_power_of_two);
/*
* Reads header of compressed data to get stored length of uncompressed data.
* REQUIRES: start points to compressed data.
* REQUIRES: n is length of available compressed data.
*
* Returns SNAPPY_E_HEADER_BAD on error.
* Returns number of bytes read from input on success.
* Stores decoded length into *result.
*/
int
csnappy_get_uncompressed_length(
const char *start,
uint32_t n,
uint32_t *result);
/*
* Safely decompresses all data from array "src" of length "src_len" containing
* entire compressed stream (with header) into array "dst" of size "dst_len".
* REQUIRES: dst_len is at least csnappy_get_uncompressed_length(...).
*
* Iff sucessful, returns CSNAPPY_E_OK.
* If recorded length in header is greater than dst_len, returns
* CSNAPPY_E_OUTPUT_INSUF.
* If compressed data is malformed, does not write more than dst_len into dst.
*/
int
csnappy_decompress(
const char *src,
uint32_t src_len,
char *dst,
uint32_t dst_len);
/*
* Safely decompresses stream src_len bytes long read from src to dst.
* Amount of available space at dst must be provided in *dst_len by caller.
* If compressed stream needs more space, it will not overflow and return
* CSNAPPY_E_OUTPUT_OVERRUN.
* On success, sets *dst_len to actal number of bytes decompressed.
* Iff sucessful, returns CSNAPPY_E_OK.
*/
int
csnappy_decompress_noheader(
const char *src,
uint32_t src_len,
char *dst,
uint32_t *dst_len);
/*
* Return values (< 0 = Error)
*/
#define CSNAPPY_E_OK 0
#define CSNAPPY_E_HEADER_BAD (-1)
#define CSNAPPY_E_OUTPUT_INSUF (-2)
#define CSNAPPY_E_OUTPUT_OVERRUN (-3)
#define CSNAPPY_E_INPUT_NOT_CONSUMED (-4)
#define CSNAPPY_E_DATA_MALFORMED (-5)
#ifdef __cplusplus
}
#endif
#endif

497
drivers/staging/snappy/csnappy_compress.c Executable file
View File

@ -0,0 +1,497 @@
/*
Copyright 2011, Google Inc.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
File modified for the Linux Kernel by
Zeev Tarantov <zeev.tarantov at gmail.com>
*/
#include "csnappy_internal.h"
#ifdef __KERNEL__
#include <linux/kernel.h>
#include <linux/module.h>
#endif
#include "csnappy.h"
static inline char*
encode_varint32(char *sptr, uint32_t v)
{
uint8_t* ptr = (uint8_t *)sptr;
static const int B = 128;
if (v < (1<<7)) {
*(ptr++) = v;
} else if (v < (1<<14)) {
*(ptr++) = v | B;
*(ptr++) = v>>7;
} else if (v < (1<<21)) {
*(ptr++) = v | B;
*(ptr++) = (v>>7) | B;
*(ptr++) = v>>14;
} else if (v < (1<<28)) {
*(ptr++) = v | B;
*(ptr++) = (v>>7) | B;
*(ptr++) = (v>>14) | B;
*(ptr++) = v>>21;
} else {
*(ptr++) = v | B;
*(ptr++) = (v>>7) | B;
*(ptr++) = (v>>14) | B;
*(ptr++) = (v>>21) | B;
*(ptr++) = v>>28;
}
return (char *)ptr;
}
/*
* Any hash function will produce a valid compressed bitstream, but a good
* hash function reduces the number of collisions and thus yields better
* compression for compressible input, and more speed for incompressible
* input. Of course, it doesn't hurt if the hash function is reasonably fast
* either, as it gets called a lot.
*/
static inline uint32_t HashBytes(uint32_t bytes, int shift)
{
uint32_t kMul = 0x1e35a7bd;
return (bytes * kMul) >> shift;
}
static inline uint32_t Hash(const char *p, int shift)
{
return HashBytes(UNALIGNED_LOAD32(p), shift);
}
/*
* *** DO NOT CHANGE THE VALUE OF kBlockSize ***
* New Compression code chops up the input into blocks of at most
* the following size. This ensures that back-references in the
* output never cross kBlockSize block boundaries. This can be
* helpful in implementing blocked decompression. However the
* decompression code should not rely on this guarantee since older
* compression code may not obey it.
*/
#define kBlockLog 15
#define kBlockSize (1 << kBlockLog)
/*
* Return the largest n such that
*
* s1[0,n-1] == s2[0,n-1]
* and n <= (s2_limit - s2).
*
* Does not read *s2_limit or beyond.
* Does not read *(s1 + (s2_limit - s2)) or beyond.
* Requires that s2_limit >= s2.
*
* Separate implementation for x86_64, for speed. Uses the fact that
* x86_64 is little endian.
*/
#if defined(__x86_64__)
static inline int
FindMatchLength(const char *s1, const char *s2, const char *s2_limit)
{
uint64_t x;
int matched, matching_bits;
DCHECK_GE(s2_limit, s2);
matched = 0;
/*
* Find out how long the match is. We loop over the data 64 bits at a
* time until we find a 64-bit block that doesn't match; then we find
* the first non-matching bit and use that to calculate the total
* length of the match.
*/
while (likely(s2 <= s2_limit - 8)) {
if (unlikely(UNALIGNED_LOAD64(s1 + matched) ==
UNALIGNED_LOAD64(s2))) {
s2 += 8;
matched += 8;
} else {
/*
* On current (mid-2008) Opteron models there is a 3%
* more efficient code sequence to find the first
* non-matching byte. However, what follows is ~10%
* better on Intel Core 2 and newer, and we expect AMD's
* bsf instruction to improve.
*/
x = UNALIGNED_LOAD64(s1 + matched) ^
UNALIGNED_LOAD64(s2);
matching_bits = FindLSBSetNonZero64(x);
matched += matching_bits >> 3;
return matched;
}
}
while (likely(s2 < s2_limit)) {
if (likely(s1[matched] == *s2)) {
++s2;
++matched;
} else {
return matched;
}
}
return matched;
}
#else /* !defined(__x86_64__) */
static inline int
FindMatchLength(const char *s1, const char *s2, const char *s2_limit)
{
/* Implementation based on the x86-64 version, above. */
int matched = 0;
DCHECK_GE(s2_limit, s2);
while (s2 <= s2_limit - 4 &&
UNALIGNED_LOAD32(s2) == UNALIGNED_LOAD32(s1 + matched)) {
s2 += 4;
matched += 4;
}
#if defined(__LITTLE_ENDIAN)
if (s2 <= s2_limit - 4) {
uint32_t x = UNALIGNED_LOAD32(s1 + matched) ^
UNALIGNED_LOAD32(s2);
int matching_bits = FindLSBSetNonZero(x);
matched += matching_bits >> 3;
} else {
while ((s2 < s2_limit) && (s1[matched] == *s2)) {
++s2;
++matched;
}
}
#else
while ((s2 < s2_limit) && (s1[matched] == *s2)) {
++s2;
++matched;
}
#endif
return matched;
}
#endif /* !defined(__x86_64__) */
static inline char*
EmitLiteral(char *op, const char *literal, int len, int allow_fast_path)
{
int n = len - 1; /* Zero-length literals are disallowed */
if (n < 60) {
/* Fits in tag byte */
*op++ = LITERAL | (n << 2);
/*
The vast majority of copies are below 16 bytes, for which a
call to memcpy is overkill. This fast path can sometimes
copy up to 15 bytes too much, but that is okay in the
main loop, since we have a bit to go on for both sides:
- The input will always have kInputMarginBytes = 15 extra
available bytes, as long as we're in the main loop, and
if not, allow_fast_path = false.
- The output will always have 32 spare bytes (see
snappy_max_compressed_length).
*/
if (allow_fast_path && len <= 16) {
UNALIGNED_STORE64(op, UNALIGNED_LOAD64(literal));
UNALIGNED_STORE64(op + 8,
UNALIGNED_LOAD64(literal + 8));
return op + len;
}
} else {
/* Encode in upcoming bytes */
char *base = op;
int count = 0;
op++;
while (n > 0) {
*op++ = n & 0xff;
n >>= 8;
count++;
}
DCHECK_GE(count, 1);
DCHECK_LE(count, 4);
*base = LITERAL | ((59+count) << 2);
}
memcpy(op, literal, len);
return op + len;
}
static inline char*
EmitCopyLessThan64(char *op, int offset, int len)
{
DCHECK_LE(len, 64);
DCHECK_GE(len, 4);
DCHECK_LT(offset, 65536);
if ((len < 12) && (offset < 2048)) {
int len_minus_4 = len - 4;
DCHECK_LT(len_minus_4, 8); /* Must fit in 3 bits */
*op++ = COPY_1_BYTE_OFFSET |
((len_minus_4) << 2) |
((offset >> 8) << 5);
*op++ = offset & 0xff;
} else {
*op++ = COPY_2_BYTE_OFFSET | ((len-1) << 2);
put_unaligned_le16(offset, op);
op += 2;
}
return op;
}
static inline char*
EmitCopy(char *op, int offset, int len)
{
/* Emit 64 byte copies but make sure to keep at least four bytes
* reserved */
while (len >= 68) {
op = EmitCopyLessThan64(op, offset, 64);
len -= 64;
}
/* Emit an extra 60 byte copy if have too much data to fit in one
* copy */
if (len > 64) {
op = EmitCopyLessThan64(op, offset, 60);
len -= 60;
}
/* Emit remainder */
op = EmitCopyLessThan64(op, offset, len);
return op;
}
/*
* For 0 <= offset <= 4, GetUint32AtOffset(UNALIGNED_LOAD64(p), offset) will
* equal UNALIGNED_LOAD32(p + offset). Motivation: On x86-64 hardware we have
* empirically found that overlapping loads such as
* UNALIGNED_LOAD32(p) ... UNALIGNED_LOAD32(p+1) ... UNALIGNED_LOAD32(p+2)
* are slower than UNALIGNED_LOAD64(p) followed by shifts and casts to uint32_t.
*/
static inline uint32_t
GetUint32AtOffset(uint64_t v, int offset)
{
DCHECK(0 <= offset && offset <= 4);
#ifdef __LITTLE_ENDIAN
return v >> (8 * offset);
#else
return v >> (32 - 8 * offset);
#endif
}
#define kInputMarginBytes 15
char*
csnappy_compress_fragment(
const char *input,
const uint32_t input_size,
char *op,
void *working_memory,
const int workmem_bytes_power_of_two)
{
const char *ip, *ip_end, *base_ip, *next_emit, *ip_limit, *next_ip,
*candidate, *base;
uint16_t *table = (uint16_t *)working_memory;
uint64_t input_bytes;
uint32_t hash, next_hash, prev_hash, cur_hash, skip, candidate_bytes;
int shift, matched;
DCHECK_GE(workmem_bytes_power_of_two, 9);
DCHECK_LE(workmem_bytes_power_of_two, 15);
/* Table of 2^X bytes, need (X-1) bits to address table of uint16_t.
* How many bits of 32bit hash function result are discarded? */
shift = 33 - workmem_bytes_power_of_two;
/* "ip" is the input pointer, and "op" is the output pointer. */
ip = input;
DCHECK_LE(input_size, kBlockSize);
ip_end = input + input_size;
base_ip = ip;
/* Bytes in [next_emit, ip) will be emitted as literal bytes. Or
[next_emit, ip_end) after the main loop. */
next_emit = ip;
if (unlikely(input_size < kInputMarginBytes))
goto emit_remainder;
memset(working_memory, 0, 1 << workmem_bytes_power_of_two);
ip_limit = input + input_size - kInputMarginBytes;
next_hash = Hash(++ip, shift);
main_loop:
DCHECK_LT(next_emit, ip);
/*
* The body of this loop calls EmitLiteral once and then EmitCopy one or
* more times. (The exception is that when we're close to exhausting
* the input we goto emit_remainder.)
*
* In the first iteration of this loop we're just starting, so
* there's nothing to copy, so calling EmitLiteral once is
* necessary. And we only start a new iteration when the
* current iteration has determined that a call to EmitLiteral will
* precede the next call to EmitCopy (if any).
*
* Step 1: Scan forward in the input looking for a 4-byte-long match.
* If we get close to exhausting the input then goto emit_remainder.
*
* Heuristic match skipping: If 32 bytes are scanned with no matches
* found, start looking only at every other byte. If 32 more bytes are
* scanned, look at every third byte, etc.. When a match is found,
* immediately go back to looking at every byte. This is a small loss
* (~5% performance, ~0.1% density) for compressible data due to more
* bookkeeping, but for non-compressible data (such as JPEG) it's a huge
* win since the compressor quickly "realizes" the data is incompressible
* and doesn't bother looking for matches everywhere.
*
* The "skip" variable keeps track of how many bytes there are since the
* last match; dividing it by 32 (ie. right-shifting by five) gives the
* number of bytes to move ahead for each iteration.
*/
skip = 32;
next_ip = ip;
do {
ip = next_ip;
hash = next_hash;
DCHECK_EQ(hash, Hash(ip, shift));
next_ip = ip + (skip++ >> 5);
if (unlikely(next_ip > ip_limit))
goto emit_remainder;
next_hash = Hash(next_ip, shift);
candidate = base_ip + table[hash];
DCHECK_GE(candidate, base_ip);
DCHECK_LT(candidate, ip);
table[hash] = ip - base_ip;
} while (likely(UNALIGNED_LOAD32(ip) !=
UNALIGNED_LOAD32(candidate)));
/*
* Step 2: A 4-byte match has been found. We'll later see if more
* than 4 bytes match. But, prior to the match, input
* bytes [next_emit, ip) are unmatched. Emit them as "literal bytes."
*/
DCHECK_LE(next_emit + 16, ip_end);
op = EmitLiteral(op, next_emit, ip - next_emit, 1);
/*
* Step 3: Call EmitCopy, and then see if another EmitCopy could
* be our next move. Repeat until we find no match for the
* input immediately after what was consumed by the last EmitCopy call.
*
* If we exit this loop normally then we need to call EmitLiteral next,
* though we don't yet know how big the literal will be. We handle that
* by proceeding to the next iteration of the main loop. We also can exit
* this loop via goto if we get close to exhausting the input.
*/
input_bytes = 0;
candidate_bytes = 0;
do {
/* We have a 4-byte match at ip, and no need to emit any
"literal bytes" prior to ip. */
base = ip;
matched = 4 + FindMatchLength(candidate + 4, ip + 4, ip_end);
ip += matched;
DCHECK_EQ(0, memcmp(base, candidate, matched));
op = EmitCopy(op, base - candidate, matched);
/* We could immediately start working at ip now, but to improve
compression we first update table[Hash(ip - 1, ...)]. */
next_emit = ip;
if (unlikely(ip >= ip_limit))
goto emit_remainder;
input_bytes = UNALIGNED_LOAD64(ip - 1);
prev_hash = HashBytes(GetUint32AtOffset(input_bytes, 0), shift);
table[prev_hash] = ip - base_ip - 1;
cur_hash = HashBytes(GetUint32AtOffset(input_bytes, 1), shift);
candidate = base_ip + table[cur_hash];
candidate_bytes = UNALIGNED_LOAD32(candidate);
table[cur_hash] = ip - base_ip;
} while (GetUint32AtOffset(input_bytes, 1) == candidate_bytes);
next_hash = HashBytes(GetUint32AtOffset(input_bytes, 2), shift);
++ip;
goto main_loop;
emit_remainder:
/* Emit the remaining bytes as a literal */
if (next_emit < ip_end)
op = EmitLiteral(op, next_emit, ip_end - next_emit, 0);
return op;
}
#if defined(__KERNEL__) && !defined(STATIC)
EXPORT_SYMBOL(csnappy_compress_fragment);
#endif
uint32_t __attribute__((const))
csnappy_max_compressed_length(uint32_t source_len)
{
return 32 + source_len + source_len/6;
}
#if defined(__KERNEL__) && !defined(STATIC)
EXPORT_SYMBOL(csnappy_max_compressed_length);
#endif
void
csnappy_compress(
const char *input,
uint32_t input_length,
char *compressed,
uint32_t *compressed_length,
void *working_memory,
const int workmem_bytes_power_of_two)
{
int workmem_size;
int num_to_read;
uint32_t written = 0;
char *p = encode_varint32(compressed, input_length);
written += (p - compressed);
compressed = p;
while (input_length > 0) {
num_to_read = min(input_length, (uint32_t)kBlockSize);
workmem_size = workmem_bytes_power_of_two;
if (num_to_read < kBlockSize) {
for (workmem_size = 9;
workmem_size < workmem_bytes_power_of_two;
++workmem_size) {
if ((1 << (workmem_size-1)) >= num_to_read)
break;
}
}
p = csnappy_compress_fragment(
input, num_to_read, compressed,
working_memory, workmem_size);
written += (p - compressed);
compressed = p;
input_length -= num_to_read;
input += num_to_read;
}
*compressed_length = written;
}
#if defined(__KERNEL__) && !defined(STATIC)
EXPORT_SYMBOL(csnappy_compress);
MODULE_LICENSE("BSD");
MODULE_DESCRIPTION("Snappy Compressor");
#endif

321
drivers/staging/snappy/csnappy_decompress.c Executable file
View File

@ -0,0 +1,321 @@
/*
Copyright 2011, Google Inc.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
File modified for the Linux Kernel by
Zeev Tarantov <zeev.tarantov at gmail.com>
*/
#include "csnappy_internal.h"
#ifdef __KERNEL__
#include <linux/kernel.h>
#include <linux/module.h>
#endif
#include "csnappy.h"
/* Mapping from i in range [0,4] to a mask to extract the bottom 8*i bits */
static const uint32_t wordmask[] = {
0u, 0xffu, 0xffffu, 0xffffffu, 0xffffffffu
};
/*
* Data stored per entry in lookup table:
* Range Bits-used Description
* ------------------------------------
* 1..64 0..7 Literal/copy length encoded in opcode byte
* 0..7 8..10 Copy offset encoded in opcode byte / 256
* 0..4 11..13 Extra bytes after opcode
*
* We use eight bits for the length even though 7 would have sufficed
* because of efficiency reasons:
* (1) Extracting a byte is faster than a bit-field
* (2) It properly aligns copy offset so we do not need a <<8
*/
static const uint16_t char_table[256] = {
0x0001, 0x0804, 0x1001, 0x2001, 0x0002, 0x0805, 0x1002, 0x2002,
0x0003, 0x0806, 0x1003, 0x2003, 0x0004, 0x0807, 0x1004, 0x2004,
0x0005, 0x0808, 0x1005, 0x2005, 0x0006, 0x0809, 0x1006, 0x2006,
0x0007, 0x080a, 0x1007, 0x2007, 0x0008, 0x080b, 0x1008, 0x2008,
0x0009, 0x0904, 0x1009, 0x2009, 0x000a, 0x0905, 0x100a, 0x200a,
0x000b, 0x0906, 0x100b, 0x200b, 0x000c, 0x0907, 0x100c, 0x200c,
0x000d, 0x0908, 0x100d, 0x200d, 0x000e, 0x0909, 0x100e, 0x200e,
0x000f, 0x090a, 0x100f, 0x200f, 0x0010, 0x090b, 0x1010, 0x2010,
0x0011, 0x0a04, 0x1011, 0x2011, 0x0012, 0x0a05, 0x1012, 0x2012,
0x0013, 0x0a06, 0x1013, 0x2013, 0x0014, 0x0a07, 0x1014, 0x2014,
0x0015, 0x0a08, 0x1015, 0x2015, 0x0016, 0x0a09, 0x1016, 0x2016,
0x0017, 0x0a0a, 0x1017, 0x2017, 0x0018, 0x0a0b, 0x1018, 0x2018,
0x0019, 0x0b04, 0x1019, 0x2019, 0x001a, 0x0b05, 0x101a, 0x201a,
0x001b, 0x0b06, 0x101b, 0x201b, 0x001c, 0x0b07, 0x101c, 0x201c,
0x001d, 0x0b08, 0x101d, 0x201d, 0x001e, 0x0b09, 0x101e, 0x201e,
0x001f, 0x0b0a, 0x101f, 0x201f, 0x0020, 0x0b0b, 0x1020, 0x2020,
0x0021, 0x0c04, 0x1021, 0x2021, 0x0022, 0x0c05, 0x1022, 0x2022,
0x0023, 0x0c06, 0x1023, 0x2023, 0x0024, 0x0c07, 0x1024, 0x2024,
0x0025, 0x0c08, 0x1025, 0x2025, 0x0026, 0x0c09, 0x1026, 0x2026,
0x0027, 0x0c0a, 0x1027, 0x2027, 0x0028, 0x0c0b, 0x1028, 0x2028,
0x0029, 0x0d04, 0x1029, 0x2029, 0x002a, 0x0d05, 0x102a, 0x202a,
0x002b, 0x0d06, 0x102b, 0x202b, 0x002c, 0x0d07, 0x102c, 0x202c,
0x002d, 0x0d08, 0x102d, 0x202d, 0x002e, 0x0d09, 0x102e, 0x202e,
0x002f, 0x0d0a, 0x102f, 0x202f, 0x0030, 0x0d0b, 0x1030, 0x2030,
0x0031, 0x0e04, 0x1031, 0x2031, 0x0032, 0x0e05, 0x1032, 0x2032,
0x0033, 0x0e06, 0x1033, 0x2033, 0x0034, 0x0e07, 0x1034, 0x2034,
0x0035, 0x0e08, 0x1035, 0x2035, 0x0036, 0x0e09, 0x1036, 0x2036,
0x0037, 0x0e0a, 0x1037, 0x2037, 0x0038, 0x0e0b, 0x1038, 0x2038,
0x0039, 0x0f04, 0x1039, 0x2039, 0x003a, 0x0f05, 0x103a, 0x203a,
0x003b, 0x0f06, 0x103b, 0x203b, 0x003c, 0x0f07, 0x103c, 0x203c,
0x0801, 0x0f08, 0x103d, 0x203d, 0x1001, 0x0f09, 0x103e, 0x203e,
0x1801, 0x0f0a, 0x103f, 0x203f, 0x2001, 0x0f0b, 0x1040, 0x2040
};
/*
* Copy "len" bytes from "src" to "op", one byte at a time. Used for
* handling COPY operations where the input and output regions may
* overlap. For example, suppose:
* src == "ab"
* op == src + 2
* len == 20
* After IncrementalCopy(src, op, len), the result will have
* eleven copies of "ab"
* ababababababababababab
* Note that this does not match the semantics of either memcpy()
* or memmove().
*/
static inline void IncrementalCopy(const char *src, char *op, int len)
{
DCHECK_GT(len, 0);
do {
*op++ = *src++;
} while (--len > 0);
}
/*
* Equivalent to IncrementalCopy except that it can write up to ten extra
* bytes after the end of the copy, and that it is faster.
*
* The main part of this loop is a simple copy of eight bytes at a time until
* we've copied (at least) the requested amount of bytes. However, if op and
* src are less than eight bytes apart (indicating a repeating pattern of
* length < 8), we first need to expand the pattern in order to get the correct
* results. For instance, if the buffer looks like this, with the eight-byte
* <src> and <op> patterns marked as intervals:
*
* abxxxxxxxxxxxx
* [------] src
* [------] op
*
* a single eight-byte copy from <src> to <op> will repeat the pattern once,
* after which we can move <op> two bytes without moving <src>:
*
* ababxxxxxxxxxx
* [------] src
* [------] op
*
* and repeat the exercise until the two no longer overlap.
*
* This allows us to do very well in the special case of one single byte
* repeated many times, without taking a big hit for more general cases.
*
* The worst case of extra writing past the end of the match occurs when
* op - src == 1 and len == 1; the last copy will read from byte positions
* [0..7] and write to [4..11], whereas it was only supposed to write to
* position 1. Thus, ten excess bytes.
*/
static const int kMaxIncrementCopyOverflow = 10;
static inline void IncrementalCopyFastPath(const char *src, char *op, int len)
{
while (op - src < 8) {
UNALIGNED_STORE64(op, UNALIGNED_LOAD64(src));
len -= op - src;
op += op - src;
}
while (len > 0) {
UNALIGNED_STORE64(op, UNALIGNED_LOAD64(src));
src += 8;
op += 8;
len -= 8;
}
}
/* A type that writes to a flat array. */
struct SnappyArrayWriter {
char *base;
char *op;
char *op_limit;
};
static inline int
SAW__Append(struct SnappyArrayWriter *this,
const char *ip, uint32_t len, int allow_fast_path)
{
char *op = this->op;
const int space_left = this->op_limit - op;
/*Fast path, used for the majority (about 90%) of dynamic invocations.*/
if (allow_fast_path && len <= 16 && space_left >= 16) {
UNALIGNED_STORE64(op, UNALIGNED_LOAD64(ip));
UNALIGNED_STORE64(op + 8, UNALIGNED_LOAD64(ip + 8));
} else {
if (space_left < len)
return CSNAPPY_E_OUTPUT_OVERRUN;
memcpy(op, ip, len);
}
this->op = op + len;
return CSNAPPY_E_OK;
}
static inline int
SAW__AppendFromSelf(struct SnappyArrayWriter *this,
uint32_t offset, uint32_t len)
{
char *op = this->op;
const int space_left = this->op_limit - op;
/* -1u catches offset==0 */
if (op - this->base <= offset - 1u)
return CSNAPPY_E_DATA_MALFORMED;
/* Fast path, used for the majority (70-80%) of dynamic invocations. */
if (len <= 16 && offset >= 8 && space_left >= 16) {
UNALIGNED_STORE64(op, UNALIGNED_LOAD64(op - offset));
UNALIGNED_STORE64(op + 8, UNALIGNED_LOAD64(op - offset + 8));
} else if (space_left >= len + kMaxIncrementCopyOverflow) {
IncrementalCopyFastPath(op - offset, op, len);
} else {
if (space_left < len)
return CSNAPPY_E_OUTPUT_OVERRUN;
IncrementalCopy(op - offset, op, len);
}
this->op = op + len;
return CSNAPPY_E_OK;
}
int
csnappy_get_uncompressed_length(
const char *src,
uint32_t src_len,
uint32_t *result)
{
const char *src_base = src;
uint32_t shift = 0;
uint8_t c;
/* Length is encoded in 1..5 bytes */
*result = 0;
for (;;) {
if (shift >= 32)
goto err_out;
if (src_len == 0)
goto err_out;
c = *(const uint8_t *)src++;
src_len -= 1;
*result |= (uint32_t)(c & 0x7f) << shift;
if (c < 128)
break;
shift += 7;
}
return src - src_base;
err_out:
return CSNAPPY_E_HEADER_BAD;
}
#if defined(__KERNEL__) && !defined(STATIC)
EXPORT_SYMBOL(csnappy_get_uncompressed_length);
#endif
int
csnappy_decompress_noheader(
const char *src,
uint32_t src_remaining,
char *dst,
uint32_t *dst_len)
{
struct SnappyArrayWriter writer;
uint32_t length, trailer, opword, extra_bytes;
int ret;
uint8_t opcode;
char scratch[5];
writer.op = writer.base = dst;
writer.op_limit = writer.op + *dst_len;
while (src_remaining) {
if (unlikely(src_remaining < 5)) {
memcpy(scratch, src, src_remaining);
src = scratch;
}
opcode = *(const uint8_t *)src++;
opword = char_table[opcode];
extra_bytes = opword >> 11;
trailer = get_unaligned_le32(src) & wordmask[extra_bytes];
src += extra_bytes;
src_remaining -= 1 + extra_bytes;
length = opword & 0xff;
if (opcode & 0x3) {
trailer += opword & 0x700;
ret = SAW__AppendFromSelf(&writer, trailer, length);
if (ret < 0)
return ret;
} else {
length += trailer;
if (unlikely(src_remaining < length))
return CSNAPPY_E_DATA_MALFORMED;
ret = src_remaining >= 16;
ret = SAW__Append(&writer, src, length, ret);
if (ret < 0)
return ret;
src += length;
src_remaining -= length;
}
}
*dst_len = writer.op - writer.base;
return CSNAPPY_E_OK;
}
#if defined(__KERNEL__) && !defined(STATIC)
EXPORT_SYMBOL(csnappy_decompress_noheader);
#endif
int
csnappy_decompress(
const char *src,
uint32_t src_len,
char *dst,
uint32_t dst_len)
{
int n;
uint32_t olen = 0;
/* Read uncompressed length from the front of the compressed input */
n = csnappy_get_uncompressed_length(src, src_len, &olen);
if (unlikely(n < CSNAPPY_E_OK))
return n;
/* Protect against possible DoS attack */
if (unlikely(olen > dst_len))
return CSNAPPY_E_OUTPUT_INSUF;
return csnappy_decompress_noheader(src + n, src_len - n, dst, &olen);
}
#if defined(__KERNEL__) && !defined(STATIC)
EXPORT_SYMBOL(csnappy_decompress);
MODULE_LICENSE("BSD");
MODULE_DESCRIPTION("Snappy Decompressor");
#endif

83
drivers/staging/snappy/csnappy_internal.h Executable file
View File

@ -0,0 +1,83 @@
/*
Copyright 2011 Google Inc. All Rights Reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Various stubs for the open-source version of Snappy.
File modified for the Linux Kernel by
Zeev Tarantov <zeev.tarantov at gmail.com>
*/
#ifndef CSNAPPY_INTERNAL_H_
#define CSNAPPY_INTERNAL_H_
#ifndef __KERNEL__
#include "csnappy_internal_userspace.h"
#else
#include <linux/types.h>
#include <linux/string.h>
#include <linux/compiler.h>
#include <asm/byteorder.h>
#include <asm/unaligned.h>
#ifdef DEBUG
#define DCHECK(cond) if (!(cond)) \
printk(KERN_DEBUG "assert failed @ %s:%i\n", \
__FILE__, __LINE__)
#else
#define DCHECK(cond)
#endif
#define UNALIGNED_LOAD16(_p) get_unaligned((const uint16_t *)(_p))
#define UNALIGNED_LOAD32(_p) get_unaligned((const uint32_t *)(_p))
#define UNALIGNED_LOAD64(_p) get_unaligned((const uint64_t *)(_p))
#define UNALIGNED_STORE16(_p, _val) put_unaligned((_val), (uint16_t *)(_p))
#define UNALIGNED_STORE32(_p, _val) put_unaligned((_val), (uint32_t *)(_p))
#define UNALIGNED_STORE64(_p, _val) put_unaligned((_val), (uint64_t *)(_p))
#define FindLSBSetNonZero(n) __builtin_ctz(n)
#define FindLSBSetNonZero64(n) __builtin_ctzll(n)
#endif /* __KERNEL__ */
#define DCHECK_EQ(a, b) DCHECK(((a) == (b)))
#define DCHECK_NE(a, b) DCHECK(((a) != (b)))
#define DCHECK_GT(a, b) DCHECK(((a) > (b)))
#define DCHECK_GE(a, b) DCHECK(((a) >= (b)))
#define DCHECK_LT(a, b) DCHECK(((a) < (b)))
#define DCHECK_LE(a, b) DCHECK(((a) <= (b)))
enum {
LITERAL = 0,
COPY_1_BYTE_OFFSET = 1, /* 3 bit length + 3 bits of offset in opcode */
COPY_2_BYTE_OFFSET = 2,
COPY_4_BYTE_OFFSET = 3
};
#endif /* CSNAPPY_INTERNAL_H_ */

37
drivers/staging/zram/Kconfig Normal file → Executable file
View File

@ -6,8 +6,6 @@ config ZRAM
tristate "Compressed RAM block device support"
depends on BLOCK && SYSFS
select XVMALLOC
select LZO_COMPRESS
select LZO_DECOMPRESS
default n
help
Creates virtual block devices called /dev/zramX (X = 0, 1, ...).
@ -21,23 +19,6 @@ config ZRAM
See zram.txt for more information.
Project home: http://compcache.googlecode.com/
config ZRAM_NUM_DEVICES
int "Default number of zram devices"
depends on ZRAM
range 1 32
default 1
help
Select default number of zram devices. You can override this value
using 'num_devices' module parameter.
config ZRAM_DEFAULT_PERCENTAGE
int "Default number of zram percentage"
depends on ZRAM
range 10 80
default 25
help
Select default zram disk size: percentage of total RAM
config ZRAM_DEBUG
bool "Compressed RAM block device debug support"
depends on ZRAM
@ -45,11 +26,15 @@ config ZRAM_DEBUG
help
This option adds additional debugging code to the compressed
RAM block device driver.
config ZRAM_LZO
bool "LZO compression"
default y
depends on ZRAM
select LZO_COMPRESS
select LZO_DECOMPRESS
config ZRAM_DEFAULT_DISKSIZE
int "Default size of zram in bytes"
depends on ZRAM
default 100663296
help
Set default zram disk size (default ~ 96MB)
config ZRAM_SNAPPY
bool "Snappy compression"
depends on ZRAM
select SNAPPY_COMPRESS
select SNAPPY_DECOMPRESS

0
drivers/staging/zram/Makefile Normal file → Executable file
View File

0
drivers/staging/zram/xvmalloc.c Normal file → Executable file
View File

0
drivers/staging/zram/xvmalloc.h Normal file → Executable file
View File

0
drivers/staging/zram/xvmalloc_int.h Normal file → Executable file
View File

0
drivers/staging/zram/zram.txt Normal file → Executable file
View File

235
drivers/staging/zram/zram_drv.c Normal file → Executable file
View File

@ -29,12 +29,90 @@
#include <linux/genhd.h>
#include <linux/highmem.h>
#include <linux/slab.h>
#include <linux/lzo.h>
#include <linux/string.h>
#include <linux/vmalloc.h>
#include "zram_drv.h"
#if defined(CONFIG_ZRAM_LZO)
#include <linux/lzo.h>
#ifdef MULTIPLE_COMPRESSORS
static const struct zram_compressor lzo_compressor = {
.name = "LZO",
.workmem_bytes = LZO1X_MEM_COMPRESS,
.compress = &lzo1x_1_compress,
.decompress = &lzo1x_decompress_safe
};
#else /* !MULTIPLE_COMPRESSORS */
#define WMSIZE LZO1X_MEM_COMPRESS
#define COMPRESS(s, sl, d, dl, wm) \
lzo1x_1_compress(s, sl, d, dl, wm)
#define DECOMPRESS(s, sl, d, dl) \
lzo1x_decompress_safe(s, sl, d, dl)
#endif /* !MULTIPLE_COMPRESSORS */
#endif /* defined(CONFIG_ZRAM_LZO) */
#if defined(CONFIG_ZRAM_SNAPPY)
#include "../snappy/csnappy.h" /* if built in drivers/staging */
#define WMSIZE_ORDER ((PAGE_SHIFT > 14) ? (15) : (PAGE_SHIFT+1))
static int
snappy_compress_(
const unsigned char *src,
size_t src_len,
unsigned char *dst,
size_t *dst_len,
void *workmem)
{
const unsigned char *end = csnappy_compress_fragment(
src, (uint32_t)src_len, dst, workmem, WMSIZE_ORDER);
*dst_len = end - dst;
return 0;
}
static int
snappy_decompress_(
const unsigned char *src,
size_t src_len,
unsigned char *dst,
size_t *dst_len)
{
uint32_t dst_len_ = (uint32_t)*dst_len;
int ret = csnappy_decompress_noheader(src, src_len, dst, &dst_len_);
*dst_len = (size_t)dst_len_;
return ret;
}
#ifdef MULTIPLE_COMPRESSORS
static const struct zram_compressor snappy_compressor = {
.name = "SNAPPY",
.workmem_bytes = (1 << WMSIZE_ORDER),
.compress = &snappy_compress_,
.decompress = &snappy_decompress_
};
#else /* !MULTIPLE_COMPRESSORS */
#define WMSIZE (1 << WMSIZE_ORDER)
#define COMPRESS(s, sl, d, dl, wm) \
snappy_compress_(s, sl, d, dl, wm)
#define DECOMPRESS(s, sl, d, dl) \
snappy_decompress_(s, sl, d, dl)
#endif /* !MULTIPLE_COMPRESSORS */
#endif /* defined(CONFIG_ZRAM_SNAPPY) */
#ifdef MULTIPLE_COMPRESSORS
const struct zram_compressor * const zram_compressors[] = {
#if defined(CONFIG_ZRAM_LZO)
&lzo_compressor,
#endif
#if defined(CONFIG_ZRAM_SNAPPY)
&snappy_compressor,
#endif
NULL
};
#define WMSIZE (zram->compressor->workmem_bytes)
#define COMPRESS(s, sl, d, dl, wm) \
(zram->compressor->compress(s, sl, d, dl, wm))
#define DECOMPRESS(s, sl, d, dl) \
(zram->compressor->decompress(s, sl, d, dl))
#endif /* MULTIPLE_COMPRESSORS */
/* Globals */
static int zram_major;
struct zram *zram_devices;
@ -104,19 +182,33 @@ static int page_zero_filled(void *ptr)
return 1;
}
static u64 zram_default_disksize_bytes(void)
static void zram_set_disksize(struct zram *zram, size_t totalram_bytes)
{
#if 0
return ((totalram_pages << PAGE_SHIFT) *
default_disksize_perc_ram / 100) & PAGE_MASK;
#endif
return CONFIG_ZRAM_DEFAULT_DISKSIZE;
}
if (!zram->disksize) {
pr_info(
"disk size not provided. You can use disksize_kb module "
"param to specify size.\nUsing default: (%u%% of RAM).\n",
default_disksize_perc_ram
);
zram->disksize = default_disksize_perc_ram *
(totalram_bytes / 100);
}
static void zram_set_disksize(struct zram *zram, u64 size_bytes)
{
zram->disksize = size_bytes;
set_capacity(zram->disk, size_bytes >> SECTOR_SHIFT);
if (zram->disksize > 2 * (totalram_bytes)) {
pr_info(
"There is little point creating a zram of greater than "
"twice the size of memory since we expect a 2:1 compression "
"ratio. Note that zram uses about 0.1%% of the size of "
"the disk when not in use so a huge zram is "
"wasteful.\n"
"\tMemory Size: %zu kB\n"
"\tSize you selected: %llu kB\n"
"Continuing anyway ...\n",
totalram_bytes >> 10, zram->disksize
);
}
zram->disksize &= PAGE_MASK;
}
static void zram_free_page(struct zram *zram, size_t index)
@ -243,7 +335,7 @@ static int zram_bvec_read(struct zram *zram, struct bio_vec *bvec,
cmem = kmap_atomic(zram->table[index].page, KM_USER1) +
zram->table[index].offset;
ret = lzo1x_decompress_safe(cmem + sizeof(*zheader),
ret = DECOMPRESS(cmem + sizeof(*zheader),
xv_get_object_size(cmem) - sizeof(*zheader),
uncmem, &clen);
@ -257,7 +349,7 @@ static int zram_bvec_read(struct zram *zram, struct bio_vec *bvec,
kunmap_atomic(user_mem, KM_USER0);
/* Should NEVER happen. Return bio error if it does. */
if (unlikely(ret != LZO_E_OK)) {
if (unlikely(ret)) {
pr_err("Decompression failed! err=%d, page=%u\n", ret, index);
zram_stat64_inc(zram, &zram->stats.failed_reads);
return ret;
@ -291,13 +383,13 @@ static int zram_read_before_write(struct zram *zram, char *mem, u32 index)
return 0;
}
ret = lzo1x_decompress_safe(cmem + sizeof(*zheader),
ret = DECOMPRESS(cmem + sizeof(*zheader),
xv_get_object_size(cmem) - sizeof(*zheader),
mem, &clen);
kunmap_atomic(cmem, KM_USER0);
/* Should NEVER happen. Return bio error if it does. */
if (unlikely(ret != LZO_E_OK)) {
if (unlikely(ret)) {
pr_err("Decompression failed! err=%d, page=%u\n", ret, index);
zram_stat64_inc(zram, &zram->stats.failed_reads);
return ret;
@ -363,18 +455,13 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index,
goto out;
}
ret = lzo1x_1_compress(uncmem, PAGE_SIZE, src, &clen,
COMPRESS(uncmem, PAGE_SIZE, src, &clen,
zram->compress_workmem);
kunmap_atomic(user_mem, KM_USER0);
if (is_partial_io(bvec))
kfree(uncmem);
if (unlikely(ret != LZO_E_OK)) {
pr_err("Compression failed! err=%d\n", ret);
goto out;
}
/*
* Page is incompressible. Store it as-is (uncompressed)
* since we do not want to return too many disk write
@ -546,27 +633,35 @@ static int zram_make_request(struct request_queue *queue, struct bio *bio)
{
struct zram *zram = queue->queuedata;
if (unlikely(!zram->init_done) && zram_init_device(zram))
goto error;
down_read(&zram->init_lock);
if (unlikely(!zram->init_done))
goto error_unlock;
if (!valid_io_request(zram, bio)) {
zram_stat64_inc(zram, &zram->stats.invalid_io);
bio_io_error(bio);
return 0;
}
if (unlikely(!zram->init_done) && zram_init_device(zram)) {
bio_io_error(bio);
return 0;
goto error_unlock;
}
__zram_make_request(zram, bio, bio_data_dir(bio));
up_read(&zram->init_lock);
return 0;
error_unlock:
up_read(&zram->init_lock);
error:
bio_io_error(bio);
return 0;
}
void zram_reset_device(struct zram *zram)
void __zram_reset_device(struct zram *zram)
{
size_t index;
mutex_lock(&zram->init_lock);
zram->init_done = 0;
/* Free various per-device buffers */
@ -602,8 +697,14 @@ void zram_reset_device(struct zram *zram)
/* Reset stats */
memset(&zram->stats, 0, sizeof(zram->stats));
zram_set_disksize(zram, zram_default_disksize_bytes());
mutex_unlock(&zram->init_lock);
zram->disksize = 0;
}
void zram_reset_device(struct zram *zram)
{
down_write(&zram->init_lock);
__zram_reset_device(zram);
up_write(&zram->init_lock);
}
int zram_init_device(struct zram *zram)
@ -611,37 +712,39 @@ int zram_init_device(struct zram *zram)
int ret;
size_t num_pages;
mutex_lock(&zram->init_lock);
down_write(&zram->init_lock);
if (zram->init_done) {
mutex_unlock(&zram->init_lock);
up_write(&zram->init_lock);
return 0;
}
zram->compress_workmem = kzalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
zram_set_disksize(zram, totalram_pages << PAGE_SHIFT);
zram->compress_workmem = kzalloc(WMSIZE, GFP_KERNEL);
if (!zram->compress_workmem) {
pr_err("Error allocating compressor working memory!\n");
ret = -ENOMEM;
goto fail;
goto fail_no_table;
}
zram->compress_buffer = (void *)__get_free_pages(__GFP_ZERO, 1);
zram->compress_buffer =
(void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 1);
if (!zram->compress_buffer) {
pr_err("Error allocating compressor buffer space\n");
ret = -ENOMEM;
goto fail;
goto fail_no_table;
}
num_pages = zram->disksize >> PAGE_SHIFT;
zram->table = vmalloc(num_pages * sizeof(*zram->table));
if (!zram->table) {
pr_err("Error allocating zram address table\n");
/* To prevent accessing table entries during cleanup */
zram->disksize = 0;
ret = -ENOMEM;
goto fail;
goto fail_no_table;
}
memset(zram->table, 0, num_pages * sizeof(*zram->table));
memset(zram->table, 0, num_pages * sizeof(*zram->table));
set_capacity(zram->disk, zram->disksize >> SECTOR_SHIFT);
/* zram devices sort of resembles non-rotational disks */
queue_flag_set_unlocked(QUEUE_FLAG_NONROT, zram->disk->queue);
@ -654,15 +757,17 @@ int zram_init_device(struct zram *zram)
}
zram->init_done = 1;
mutex_unlock(&zram->init_lock);
up_write(&zram->init_lock);
pr_debug("Initialization done!\n");
return 0;
fail_no_table:
/* To prevent accessing table entries during cleanup */
zram->disksize = 0;
fail:
mutex_unlock(&zram->init_lock);
zram_reset_device(zram);
__zram_reset_device(zram);
up_write(&zram->init_lock);
pr_err("Initialization failed: err=%d\n", ret);
return ret;
}
@ -687,7 +792,7 @@ static int create_device(struct zram *zram, int device_id)
int ret = 0;
init_rwsem(&zram->lock);
mutex_init(&zram->init_lock);
init_rwsem(&zram->init_lock);
spin_lock_init(&zram->stat64_lock);
zram->queue = blk_alloc_queue(GFP_KERNEL);
@ -718,13 +823,13 @@ static int create_device(struct zram *zram, int device_id)
zram->disk->private_data = zram;
snprintf(zram->disk->disk_name, 16, "zram%d", device_id);
/*
* Set some default disksize. To set another disksize, user
* must reset the device and then write a new disksize to
* corresponding device's sysfs node.
*/
zram_set_disksize(zram, zram_default_disksize_bytes());
/* Actual capacity set using syfs (/sys/block/zram<id>/disksize */
set_capacity(zram->disk, 0);
/* Can be changed using sysfs (/sys/block/zram<id>/compressor) */
#ifdef MULTIPLE_COMPRESSORS
zram->compressor = zram_compressors[0];
#endif
/*
* To ensure that we always get PAGE_SIZE aligned
* and n*PAGE_SIZED sized I/O requests.
@ -768,13 +873,6 @@ static int __init zram_init(void)
{
int ret, dev_id;
/*
* Module parameter not specified by user. Use default
* value as defined during kernel config.
*/
if (zram_num_devices == 0)
zram_num_devices = CONFIG_ZRAM_NUM_DEVICES;
if (zram_num_devices > max_num_devices) {
pr_warning("Invalid value for num_devices: %u\n",
zram_num_devices);
@ -789,12 +887,15 @@ static int __init zram_init(void)
goto out;
}
if (!zram_num_devices) {
pr_info("num_devices not specified. Using default: 1\n");
zram_num_devices = 1;
}
/* Allocate the device array and initialize each one */
pr_info("Creating %u devices ...\n", zram_num_devices);
zram_devices = kzalloc(zram_num_devices * sizeof(struct zram),
GFP_KERNEL);
if (!zram_devices)
{
zram_devices = kzalloc(zram_num_devices * sizeof(struct zram), GFP_KERNEL);
if (!zram_devices) {
ret = -ENOMEM;
goto unregister;
}
@ -836,8 +937,8 @@ static void __exit zram_exit(void)
pr_debug("Cleanup done!\n");
}
module_param_named(num_devices, zram_num_devices, uint, 0);
MODULE_PARM_DESC(num_devices, "Number of zram devices");
module_param(zram_num_devices, uint, 0);
MODULE_PARM_DESC(zram_num_devices, "Number of zram devices");
module_init(zram_init);
module_exit(zram_exit);

38
drivers/staging/zram/zram_drv.h Normal file → Executable file
View File

@ -41,7 +41,7 @@ struct zobj_header {
/*-- Configurable parameters */
/* Default zram disk size: 25% of total RAM */
static const unsigned default_disksize_perc_ram = CONFIG_ZRAM_DEFAULT_PERCENTAGE;
static const unsigned default_disksize_perc_ram = 25;
/*
* Pages that compress to size greater than this are stored
@ -66,6 +66,13 @@ static const size_t max_zpage_size = PAGE_SIZE / 4 * 3;
#define ZRAM_SECTOR_PER_LOGICAL_BLOCK \
(1 << (ZRAM_LOGICAL_BLOCK_SHIFT - SECTOR_SHIFT))
#if defined(CONFIG_ZRAM_LZO) + defined(CONFIG_ZRAM_SNAPPY) == 0
#error At least one of CONFIG_ZRAM_LZO, CONFIG_ZRAM_SNAPPY must be defined!
#endif
#if defined(CONFIG_ZRAM_LZO) + defined(CONFIG_ZRAM_SNAPPY) > 1
#define MULTIPLE_COMPRESSORS
#endif
/* Flags for zram pages (table[page_no].flags) */
enum zram_pageflags {
/* Page is stored uncompressed */
@ -103,6 +110,9 @@ struct zram_stats {
struct zram {
struct xv_pool *mem_pool;
#ifdef MULTIPLE_COMPRESSORS
const struct zram_compressor *compressor;
#endif
void *compress_workmem;
void *compress_buffer;
struct table *table;
@ -112,8 +122,8 @@ struct zram {
struct request_queue *queue;
struct gendisk *disk;
int init_done;
/* Prevent concurrent execution of device init and reset */
struct mutex init_lock;
/* Prevent concurrent execution of device init, reset and R/W request */
struct rw_semaphore init_lock;
/*
* This is the limit on amount of *uncompressed* worth of data
* we can store in a disk.
@ -130,7 +140,27 @@ extern struct attribute_group zram_disk_attr_group;
#endif
extern int zram_init_device(struct zram *zram);
extern void zram_reset_device(struct zram *zram);
extern void __zram_reset_device(struct zram *zram);
#ifdef MULTIPLE_COMPRESSORS
struct zram_compressor {
const char *name;
int (*compress)(
const unsigned char *src,
size_t src_len,
unsigned char *dst,
size_t *dst_len,
void *workmem);
int (*decompress)(
const unsigned char *src,
size_t src_len,
unsigned char *dst,
size_t *dst_len);
unsigned workmem_bytes;
};
extern const struct zram_compressor * const zram_compressors[];
#endif
#endif

76
drivers/staging/zram/zram_sysfs.c Normal file → Executable file
View File

@ -55,23 +55,78 @@ static ssize_t disksize_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
int ret;
u64 disksize;
struct zram *zram = dev_to_zram(dev);
ret = strict_strtoull(buf, 10, &disksize);
if (ret)
return ret;
down_write(&zram->init_lock);
if (zram->init_done) {
up_write(&zram->init_lock);
pr_info("Cannot change disksize for initialized device\n");
return -EBUSY;
}
ret = strict_strtoull(buf, 10, &zram->disksize);
if (ret)
return ret;
zram->disksize = PAGE_ALIGN(zram->disksize);
zram->disksize = PAGE_ALIGN(disksize);
set_capacity(zram->disk, zram->disksize >> SECTOR_SHIFT);
up_write(&zram->init_lock);
return len;
}
#ifdef MULTIPLE_COMPRESSORS
static ssize_t compressor_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
char * const buf_base = buf;
const struct zram_compressor *p, *curr;
unsigned int i = 0;
struct zram *zram = dev_to_zram(dev);
curr = zram->compressor;
p = zram_compressors[i];
while (p) {
if (curr == p)
buf += sprintf(buf, "*");
buf += sprintf(buf, "%u - %s\n", i, p->name);
p = zram_compressors[++i];
}
return buf - buf_base;
}
static ssize_t compressor_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t len)
{
const struct zram_compressor *p;
unsigned long requested;
unsigned int i = 0;
int ret;
struct zram *zram = dev_to_zram(dev);
if (zram->init_done) {
pr_info("Cannot change compressor for initialized device\n");
return -EBUSY;
}
ret = strict_strtoul(buf, 10, &requested);
if (ret)
return ret;
p = zram_compressors[i];
while (p && (i < requested))
p = zram_compressors[++i];
if (!p) {
pr_info("No compressor with index #%lu\n", requested);
return -EINVAL;
}
zram->compressor = p;
return len;
}
#endif /* MULTIPLE_COMPRESSORS */
static ssize_t initstate_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@ -106,8 +161,10 @@ static ssize_t reset_store(struct device *dev,
if (bdev)
fsync_bdev(bdev);
down_write(&zram->init_lock);
if (zram->init_done)
zram_reset_device(zram);
__zram_reset_device(zram);
up_write(&zram->init_lock);
return len;
}
@ -188,6 +245,10 @@ static ssize_t mem_used_total_show(struct device *dev,
return sprintf(buf, "%llu\n", val);
}
#ifdef MULTIPLE_COMPRESSORS
static DEVICE_ATTR(compressor, S_IRUGO | S_IWUSR,
compressor_show, compressor_store);
#endif
static DEVICE_ATTR(disksize, S_IRUGO | S_IWUSR,
disksize_show, disksize_store);
static DEVICE_ATTR(initstate, S_IRUGO, initstate_show, NULL);
@ -202,6 +263,9 @@ static DEVICE_ATTR(compr_data_size, S_IRUGO, compr_data_size_show, NULL);
static DEVICE_ATTR(mem_used_total, S_IRUGO, mem_used_total_show, NULL);
static struct attribute *zram_disk_attrs[] = {
#ifdef MULTIPLE_COMPRESSORS
&dev_attr_compressor.attr,
#endif
&dev_attr_disksize.attr,
&dev_attr_initstate.attr,
&dev_attr_reset.attr,

0
include/linux/capability.h Normal file → Executable file
View File

64
mm/ksm.c Normal file → Executable file
View File

@ -163,9 +163,6 @@ static unsigned long ksm_pages_unshared;
/* The number of rmap_items in use: to calculate pages_volatile */
static unsigned long ksm_rmap_items;
/* Limit on the number of unswappable pages used */
static unsigned long ksm_max_kernel_pages;
/* Number of pages ksmd should scan in one batch */
static unsigned int ksm_thread_pages_to_scan = 100;
@ -317,7 +314,7 @@ static int break_ksm(struct vm_area_struct *vma, unsigned long addr)
do {
cond_resched();
page = follow_page(vma, addr, FOLL_GET);
if (!page)
if (IS_ERR_OR_NULL(page))
break;
if (PageKsm(page))
ret = handle_mm_fault(vma->vm_mm, vma, addr,
@ -391,7 +388,7 @@ static struct page *get_mergeable_page(struct rmap_item *rmap_item)
goto out;
page = follow_page(vma, addr, FOLL_GET);
if (!page)
if (IS_ERR_OR_NULL(page))
goto out;
if (PageAnon(page)) {
flush_anon_page(vma, page, addr);
@ -628,7 +625,7 @@ static int write_protect_page(struct vm_area_struct *vma, struct page *page,
if (!ptep)
goto out;
if (pte_write(*ptep)) {
if (pte_write(*ptep) || pte_dirty(*ptep)) {
pte_t entry;
swapped = PageSwapCache(page);
@ -648,10 +645,12 @@ static int write_protect_page(struct vm_area_struct *vma, struct page *page,
* page
*/
if ((page_mapcount(page) + 2 + swapped) != page_count(page)) {
set_pte_at_notify(mm, addr, ptep, entry);
set_pte_at(mm, addr, ptep, entry);
goto out_unlock;
}
entry = pte_wrprotect(entry);
if (pte_dirty(entry))
set_page_dirty(page);
entry = pte_mkclean(pte_wrprotect(entry));
set_pte_at_notify(mm, addr, ptep, entry);
}
*orig_pte = *ptep;
@ -717,6 +716,8 @@ static int replace_page(struct vm_area_struct *vma, struct page *oldpage,
set_pte_at_notify(mm, addr, ptep, mk_pte(newpage, prot));
page_remove_rmap(oldpage);
if (!page_mapped(oldpage))
try_to_free_swap(oldpage);
put_page(oldpage);
pte_unmap_unlock(ptep, ptl);
@ -827,13 +828,6 @@ static int try_to_merge_two_pages(struct mm_struct *mm1, unsigned long addr1,
struct page *kpage;
int err = -EFAULT;
/*
* The number of nodes in the stable tree
* is the number of kernel pages that we hold.
*/
if (ksm_max_kernel_pages &&
ksm_max_kernel_pages <= ksm_pages_shared)
return err;
kpage = alloc_page(GFP_HIGHUSER);
if (!kpage)
@ -1209,6 +1203,18 @@ static struct rmap_item *scan_get_next_rmap_item(struct page **page)
slot = ksm_scan.mm_slot;
if (slot == &ksm_mm_head) {
/*
* A number of pages can hang around indefinitely on per-cpu
* pagevecs, raised page count preventing write_protect_page
* from merging them. Though it doesn't really matter much,
* it is puzzling to see some stuck in pages_volatile until
* other activity jostles them out, and they also prevented
* LTP's KSM test from succeeding deterministically; so drain
* them here (here rather than on entry to ksm_do_scan(),
* so we don't IPI too often when pages_to_scan is set low).
*/
lru_add_drain_all();
root_unstable_tree = RB_ROOT;
spin_lock(&ksm_mmlist_lock);
@ -1314,7 +1320,7 @@ next_mm:
static void ksm_do_scan(unsigned int scan_npages)
{
struct rmap_item *rmap_item;
struct page *page;
struct page *uninitialized_var(page);
while (scan_npages--) {
cond_resched();
@ -1577,29 +1583,6 @@ static ssize_t run_store(struct kobject *kobj, struct kobj_attribute *attr,
}
KSM_ATTR(run);
static ssize_t max_kernel_pages_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t count)
{
int err;
unsigned long nr_pages;
err = strict_strtoul(buf, 10, &nr_pages);
if (err)
return -EINVAL;
ksm_max_kernel_pages = nr_pages;
return count;
}
static ssize_t max_kernel_pages_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
return sprintf(buf, "%lu\n", ksm_max_kernel_pages);
}
KSM_ATTR(max_kernel_pages);
static ssize_t pages_shared_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
@ -1649,7 +1632,6 @@ static struct attribute *ksm_attrs[] = {
&sleep_millisecs_attr.attr,
&pages_to_scan_attr.attr,
&run_attr.attr,
&max_kernel_pages_attr.attr,
&pages_shared_attr.attr,
&pages_sharing_attr.attr,
&pages_unshared_attr.attr,
@ -1669,8 +1651,6 @@ static int __init ksm_init(void)
struct task_struct *ksm_thread;
int err;
ksm_max_kernel_pages = totalram_pages / 4;
err = ksm_slab_init();
if (err)
goto out;

7
mm/vmalloc.c Normal file → Executable file
View File

@ -1470,6 +1470,7 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
{
struct page **pages;
unsigned int nr_pages, array_size, i;
gfp_t nested_gfp = (gfp_mask & GFP_RECLAIM_MASK) | __GFP_ZERO;
nr_pages = (area->size - PAGE_SIZE) >> PAGE_SHIFT;
array_size = (nr_pages * sizeof(struct page *));
@ -1477,13 +1478,11 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
area->nr_pages = nr_pages;
/* Please note that the recursion is strictly bounded. */
if (array_size > PAGE_SIZE) {
pages = __vmalloc_node(array_size, 1, gfp_mask | __GFP_ZERO,
pages = __vmalloc_node(array_size, 1, nested_gfp|__GFP_HIGHMEM,
PAGE_KERNEL, node, caller);
area->flags |= VM_VPAGES;
} else {
pages = kmalloc_node(array_size,
(gfp_mask & GFP_RECLAIM_MASK) | __GFP_ZERO,
node);
pages = kmalloc_node(array_size, nested_gfp, node);
}
area->pages = pages;
area->caller = caller;