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PM: hibernate: Move to crypto APIs for LZO compression

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Currently for hibernation, LZO is the only compression algorithm
available and uses the existing LZO library calls. However, there
is no flexibility to switch to other algorithms which provides better
results. The main idea is that different compression algorithms have
different characteristics and hibernation may benefit when it uses
alternate algorithms.

By moving to crypto based APIs, it lays a foundation to use other
compression algorithms for hibernation. There are no functional changes
introduced by this approach.

Signed-off-by: Nikhil V <quic_nprakash@quicinc.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Nikhil V 2024-01-22 18:45:26 +05:30 committed by Rafael J. Wysocki
parent 89a807625f
commit a06c6f5d3c
4 changed files with 132 additions and 28 deletions
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21
kernel/power/Kconfig
View File

@ -39,9 +39,9 @@ config HIBERNATION
bool "Hibernation (aka 'suspend to disk')"
depends on SWAP && ARCH_HIBERNATION_POSSIBLE
select HIBERNATE_CALLBACKS
select LZO_COMPRESS
select LZO_DECOMPRESS
select CRC32
select CRYPTO
select CRYPTO_LZO
help
Enable the suspend to disk (STD) functionality, which is usually
called "hibernation" in user interfaces. STD checkpoints the
@ -92,6 +92,23 @@ config HIBERNATION_SNAPSHOT_DEV
If in doubt, say Y.
choice
prompt "Default compressor"
default HIBERNATION_COMP_LZO
depends on HIBERNATION
config HIBERNATION_COMP_LZO
bool "lzo"
depends on CRYPTO_LZO
endchoice
config HIBERNATION_DEF_COMP
string
default "lzo" if HIBERNATION_COMP_LZO
help
Default compressor to be used for hibernation.
config PM_STD_PARTITION
string "Default resume partition"
depends on HIBERNATION

33
kernel/power/hibernate.c
View File

@ -47,6 +47,15 @@ dev_t swsusp_resume_device;
sector_t swsusp_resume_block;
__visible int in_suspend __nosavedata;
static const char *default_compressor = CONFIG_HIBERNATION_DEF_COMP;
/*
* Compression/decompression algorithm to be used while saving/loading
* image to/from disk. This would later be used in 'kernel/power/swap.c'
* to allocate comp streams.
*/
char hib_comp_algo[CRYPTO_MAX_ALG_NAME];
enum {
HIBERNATION_INVALID,
HIBERNATION_PLATFORM,
@ -732,6 +741,17 @@ int hibernate(void)
return -EPERM;
}
/*
* Query for the compression algorithm support if compression is enabled.
*/
if (!nocompress) {
strscpy(hib_comp_algo, default_compressor, sizeof(hib_comp_algo));
if (crypto_has_comp(hib_comp_algo, 0, 0) != 1) {
pr_err("%s compression is not available\n", hib_comp_algo);
return -EOPNOTSUPP;
}
}
sleep_flags = lock_system_sleep();
/* The snapshot device should not be opened while we're running */
if (!hibernate_acquire()) {
@ -955,6 +975,19 @@ static int software_resume(void)
if (error)
goto Unlock;
/*
* Check if the hibernation image is compressed. If so, query for
* the algorithm support.
*/
if (!(swsusp_header_flags & SF_NOCOMPRESS_MODE)) {
strscpy(hib_comp_algo, default_compressor, sizeof(hib_comp_algo));
if (crypto_has_comp(hib_comp_algo, 0, 0) != 1) {
pr_err("%s compression is not available\n", hib_comp_algo);
error = -EOPNOTSUPP;
goto Unlock;
}
}
/* The snapshot device should not be opened while we're running */
if (!hibernate_acquire()) {
error = -EBUSY;

5
kernel/power/power.h
View File

@ -6,6 +6,7 @@
#include <linux/compiler.h>
#include <linux/cpu.h>
#include <linux/cpuidle.h>
#include <linux/crypto.h>
struct swsusp_info {
struct new_utsname uts;
@ -54,6 +55,10 @@ asmlinkage int swsusp_save(void);
/* kernel/power/hibernate.c */
extern bool freezer_test_done;
extern char hib_comp_algo[CRYPTO_MAX_ALG_NAME];
/* kernel/power/swap.c */
extern unsigned int swsusp_header_flags;
extern int hibernation_snapshot(int platform_mode);
extern int hibernation_restore(int platform_mode);

101
kernel/power/swap.c
View File

@ -23,7 +23,6 @@
#include <linux/swapops.h>
#include <linux/pm.h>
#include <linux/slab.h>
#include <linux/lzo.h>
#include <linux/vmalloc.h>
#include <linux/cpumask.h>
#include <linux/atomic.h>
@ -339,6 +338,13 @@ static int mark_swapfiles(struct swap_map_handle *handle, unsigned int flags)
return error;
}
/*
* Hold the swsusp_header flag. This is used in software_resume() in
* 'kernel/power/hibernate' to check if the image is compressed and query
* for the compression algorithm support(if so).
*/
unsigned int swsusp_header_flags;
/**
* swsusp_swap_check - check if the resume device is a swap device
* and get its index (if so)
@ -514,6 +520,12 @@ static int swap_writer_finish(struct swap_map_handle *handle,
return error;
}
/*
* Bytes we need for compressed data in worst case. We assume(limitation)
* this is the worst of all the compression algorithms.
*/
#define bytes_worst_compress(x) ((x) + ((x) / 16) + 64 + 3 + 2)
/* We need to remember how much compressed data we need to read. */
#define CMP_HEADER sizeof(size_t)
@ -522,7 +534,7 @@ static int swap_writer_finish(struct swap_map_handle *handle,
#define UNC_SIZE (UNC_PAGES * PAGE_SIZE)
/* Number of pages we need for compressed data (worst case). */
#define CMP_PAGES DIV_ROUND_UP(lzo1x_worst_compress(UNC_SIZE) + \
#define CMP_PAGES DIV_ROUND_UP(bytes_worst_compress(UNC_SIZE) + \
CMP_HEADER, PAGE_SIZE)
#define CMP_SIZE (CMP_PAGES * PAGE_SIZE)
@ -533,7 +545,6 @@ static int swap_writer_finish(struct swap_map_handle *handle,
#define CMP_MIN_RD_PAGES 1024
#define CMP_MAX_RD_PAGES 8192
/**
* save_image - save the suspend image data
*/
@ -629,6 +640,7 @@ static int crc32_threadfn(void *data)
*/
struct cmp_data {
struct task_struct *thr; /* thread */
struct crypto_comp *cc; /* crypto compressor stream */
atomic_t ready; /* ready to start flag */
atomic_t stop; /* ready to stop flag */
int ret; /* return code */
@ -638,15 +650,18 @@ struct cmp_data {
size_t cmp_len; /* compressed length */
unsigned char unc[UNC_SIZE]; /* uncompressed buffer */
unsigned char cmp[CMP_SIZE]; /* compressed buffer */
unsigned char wrk[LZO1X_1_MEM_COMPRESS]; /* compression workspace */
};
/* Indicates the image size after compression */
static atomic_t compressed_size = ATOMIC_INIT(0);
/*
* Compression function that runs in its own thread.
*/
static int compress_threadfn(void *data)
{
struct cmp_data *d = data;
unsigned int cmp_len = 0;
while (1) {
wait_event(d->go, atomic_read_acquire(&d->ready) ||
@ -660,9 +675,13 @@ static int compress_threadfn(void *data)
}
atomic_set(&d->ready, 0);
d->ret = lzo1x_1_compress(d->unc, d->unc_len,
d->cmp + CMP_HEADER, &d->cmp_len,
d->wrk);
cmp_len = CMP_SIZE - CMP_HEADER;
d->ret = crypto_comp_compress(d->cc, d->unc, d->unc_len,
d->cmp + CMP_HEADER,
&cmp_len);
d->cmp_len = cmp_len;
atomic_set(&compressed_size, atomic_read(&compressed_size) + d->cmp_len);
atomic_set_release(&d->stop, 1);
wake_up(&d->done);
}
@ -694,6 +713,8 @@ static int save_compressed_image(struct swap_map_handle *handle,
hib_init_batch(&hb);
atomic_set(&compressed_size, 0);
/*
* We'll limit the number of threads for compression to limit memory
* footprint.
@ -703,14 +724,14 @@ static int save_compressed_image(struct swap_map_handle *handle,
page = (void *)__get_free_page(GFP_NOIO | __GFP_HIGH);
if (!page) {
pr_err("Failed to allocate compression page\n");
pr_err("Failed to allocate %s page\n", hib_comp_algo);
ret = -ENOMEM;
goto out_clean;
}
data = vzalloc(array_size(nr_threads, sizeof(*data)));
if (!data) {
pr_err("Failed to allocate compression data\n");
pr_err("Failed to allocate %s data\n", hib_comp_algo);
ret = -ENOMEM;
goto out_clean;
}
@ -729,6 +750,13 @@ static int save_compressed_image(struct swap_map_handle *handle,
init_waitqueue_head(&data[thr].go);
init_waitqueue_head(&data[thr].done);
data[thr].cc = crypto_alloc_comp(hib_comp_algo, 0, 0);
if (IS_ERR_OR_NULL(data[thr].cc)) {
pr_err("Could not allocate comp stream %ld\n", PTR_ERR(data[thr].cc));
ret = -EFAULT;
goto out_clean;
}
data[thr].thr = kthread_run(compress_threadfn,
&data[thr],
"image_compress/%u", thr);
@ -767,7 +795,7 @@ static int save_compressed_image(struct swap_map_handle *handle,
*/
handle->reqd_free_pages = reqd_free_pages();
pr_info("Using %u thread(s) for compression\n", nr_threads);
pr_info("Using %u thread(s) for %s compression\n", nr_threads, hib_comp_algo);
pr_info("Compressing and saving image data (%u pages)...\n",
nr_to_write);
m = nr_to_write / 10;
@ -817,14 +845,14 @@ static int save_compressed_image(struct swap_map_handle *handle,
ret = data[thr].ret;
if (ret < 0) {
pr_err("compression failed\n");
pr_err("%s compression failed\n", hib_comp_algo);
goto out_finish;
}
if (unlikely(!data[thr].cmp_len ||
data[thr].cmp_len >
lzo1x_worst_compress(data[thr].unc_len))) {
pr_err("Invalid compressed length\n");
bytes_worst_compress(data[thr].unc_len))) {
pr_err("Invalid %s compressed length\n", hib_comp_algo);
ret = -1;
goto out_finish;
}
@ -862,6 +890,9 @@ out_finish:
if (!ret)
pr_info("Image saving done\n");
swsusp_show_speed(start, stop, nr_to_write, "Wrote");
pr_info("Image size after compression: %d kbytes\n",
(atomic_read(&compressed_size) / 1024));
out_clean:
hib_finish_batch(&hb);
if (crc) {
@ -870,9 +901,12 @@ out_clean:
kfree(crc);
}
if (data) {
for (thr = 0; thr < nr_threads; thr++)
for (thr = 0; thr < nr_threads; thr++) {
if (data[thr].thr)
kthread_stop(data[thr].thr);
if (data[thr].cc)
crypto_free_comp(data[thr].cc);
}
vfree(data);
}
if (page) free_page((unsigned long)page);
@ -1113,6 +1147,7 @@ static int load_image(struct swap_map_handle *handle,
*/
struct dec_data {
struct task_struct *thr; /* thread */
struct crypto_comp *cc; /* crypto compressor stream */
atomic_t ready; /* ready to start flag */
atomic_t stop; /* ready to stop flag */
int ret; /* return code */
@ -1130,6 +1165,7 @@ struct dec_data {
static int decompress_threadfn(void *data)
{
struct dec_data *d = data;
unsigned int unc_len = 0;
while (1) {
wait_event(d->go, atomic_read_acquire(&d->ready) ||
@ -1143,9 +1179,11 @@ static int decompress_threadfn(void *data)
}
atomic_set(&d->ready, 0);
d->unc_len = UNC_SIZE;
d->ret = lzo1x_decompress_safe(d->cmp + CMP_HEADER, d->cmp_len,
d->unc, &d->unc_len);
unc_len = UNC_SIZE;
d->ret = crypto_comp_decompress(d->cc, d->cmp + CMP_HEADER, d->cmp_len,
d->unc, &unc_len);
d->unc_len = unc_len;
if (clean_pages_on_decompress)
flush_icache_range((unsigned long)d->unc,
(unsigned long)d->unc + d->unc_len);
@ -1193,14 +1231,14 @@ static int load_compressed_image(struct swap_map_handle *handle,
page = vmalloc(array_size(CMP_MAX_RD_PAGES, sizeof(*page)));
if (!page) {
pr_err("Failed to allocate compression page\n");
pr_err("Failed to allocate %s page\n", hib_comp_algo);
ret = -ENOMEM;
goto out_clean;
}
data = vzalloc(array_size(nr_threads, sizeof(*data)));
if (!data) {
pr_err("Failed to allocate compression data\n");
pr_err("Failed to allocate %s data\n", hib_comp_algo);
ret = -ENOMEM;
goto out_clean;
}
@ -1221,6 +1259,13 @@ static int load_compressed_image(struct swap_map_handle *handle,
init_waitqueue_head(&data[thr].go);
init_waitqueue_head(&data[thr].done);
data[thr].cc = crypto_alloc_comp(hib_comp_algo, 0, 0);
if (IS_ERR_OR_NULL(data[thr].cc)) {
pr_err("Could not allocate comp stream %ld\n", PTR_ERR(data[thr].cc));
ret = -EFAULT;
goto out_clean;
}
data[thr].thr = kthread_run(decompress_threadfn,
&data[thr],
"image_decompress/%u", thr);
@ -1273,7 +1318,7 @@ static int load_compressed_image(struct swap_map_handle *handle,
if (!page[i]) {
if (i < CMP_PAGES) {
ring_size = i;
pr_err("Failed to allocate compression pages\n");
pr_err("Failed to allocate %s pages\n", hib_comp_algo);
ret = -ENOMEM;
goto out_clean;
} else {
@ -1283,7 +1328,7 @@ static int load_compressed_image(struct swap_map_handle *handle,
}
want = ring_size = i;
pr_info("Using %u thread(s) for decompression\n", nr_threads);
pr_info("Using %u thread(s) for %s decompression\n", nr_threads, hib_comp_algo);
pr_info("Loading and decompressing image data (%u pages)...\n",
nr_to_read);
m = nr_to_read / 10;
@ -1344,8 +1389,8 @@ static int load_compressed_image(struct swap_map_handle *handle,
data[thr].cmp_len = *(size_t *)page[pg];
if (unlikely(!data[thr].cmp_len ||
data[thr].cmp_len >
lzo1x_worst_compress(UNC_SIZE))) {
pr_err("Invalid compressed length\n");
bytes_worst_compress(UNC_SIZE))) {
pr_err("Invalid %s compressed length\n", hib_comp_algo);
ret = -1;
goto out_finish;
}
@ -1396,14 +1441,14 @@ static int load_compressed_image(struct swap_map_handle *handle,
ret = data[thr].ret;
if (ret < 0) {
pr_err("decompression failed\n");
pr_err("%s decompression failed\n", hib_comp_algo);
goto out_finish;
}
if (unlikely(!data[thr].unc_len ||
data[thr].unc_len > UNC_SIZE ||
data[thr].unc_len & (PAGE_SIZE - 1))) {
pr_err("Invalid uncompressed length\n");
pr_err("Invalid %s uncompressed length\n", hib_comp_algo);
ret = -1;
goto out_finish;
}
@ -1464,9 +1509,12 @@ out_clean:
kfree(crc);
}
if (data) {
for (thr = 0; thr < nr_threads; thr++)
for (thr = 0; thr < nr_threads; thr++) {
if (data[thr].thr)
kthread_stop(data[thr].thr);
if (data[thr].cc)
crypto_free_comp(data[thr].cc);
}
vfree(data);
}
vfree(page);
@ -1535,6 +1583,7 @@ int swsusp_check(bool exclusive)
if (!memcmp(HIBERNATE_SIG, swsusp_header->sig, 10)) {
memcpy(swsusp_header->sig, swsusp_header->orig_sig, 10);
swsusp_header_flags = swsusp_header->flags;
/* Reset swap signature now */
error = hib_submit_io(REQ_OP_WRITE | REQ_SYNC,
swsusp_resume_block,