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ANDROID: vendor_hooks: Add hooks to support hibernation

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In case of hibernation with compression enabled, 'n' number of pages
will be compressed to 'x' number of pages before being written to the
disk. Keep a note of these compressed block counts so that bootloader
can directly read 'x' pages and pass it on to the decompressor. An
array will be maintained which will hold the count of these compressed
blocks and later on written to the the disk as part of the hibernation
image save process.

The vendor hook '__tracepoint_android_vh_hibernated_do_mem_alloc' does
the required memory allocations, for example, the array which is
dynamically allocated based on the snapshot image size so as to hold
the compressed block counts etc. This memory is later freed as part of
PM_POST_HIBERNATION notifier call.

The vendor hook '__tracepoint_android_vh_hibernate_save_cmp_len' saves
the compressed block counts to the array which is later written to the
disk.

Bug: 335581841
Change-Id: I574b641e2d9f4cd503c7768a66a7be3142c2686b
Signed-off-by: Nikhil V <quic_nprakash@quicinc.com>
This commit is contained in:
Nikhil V 2023-09-11 11:31:38 +05:30
parent e7e8932600
commit 8f08ea0d59
3 changed files with 24 additions and 1 deletions
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2
drivers/android/vendor_hooks.c
View File

@ -406,3 +406,5 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_delayacct_wpcopy_end);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_rvh_usb_dev_suspend);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_usb_dev_resume);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_sound_usb_support_cpu_suspend);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_hibernated_do_mem_alloc);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_hibernate_save_cmp_len);

9
include/trace/hooks/bl_hib.h
View File

@ -39,6 +39,15 @@ DECLARE_HOOK(android_vh_post_image_save,
TP_PROTO(unsigned short root_swap),
TP_ARGS(root_swap));
DECLARE_HOOK(android_vh_hibernated_do_mem_alloc,
TP_PROTO(unsigned long nr_pages, unsigned int swsusp_header_flags,
int *ret),
TP_ARGS(nr_pages, swsusp_header_flags, ret));
DECLARE_HOOK(android_vh_hibernate_save_cmp_len,
TP_PROTO(size_t cmp_len),
TP_ARGS(cmp_len));
#endif /* _TRACE_HOOK_BL_HIB_H */
/* This part must be outside protection */
#include <trace/define_trace.h>

14
kernel/power/swap.c
View File

@ -883,6 +883,7 @@ static int save_compressed_image(struct swap_map_handle *handle,
if (ret)
goto out_finish;
}
trace_android_vh_hibernate_save_cmp_len(data[thr].cmp_len + CMP_HEADER);
}
wait_event(crc->done, atomic_read(&crc->stop));
@ -955,9 +956,20 @@ int swsusp_write(unsigned int flags)
struct snapshot_handle snapshot;
struct swsusp_info *header;
unsigned long pages;
int error;
int error = 0;
pages = snapshot_get_image_size();
/*
* The memory allocated by this vendor hook is later freed as part of
* PM_POST_HIBERNATION notifier call.
*/
trace_android_vh_hibernated_do_mem_alloc(pages, flags, &error);
if (error < 0) {
pr_err("Failed to allocate required memory\n");
return error;
}
error = get_swap_writer(&handle);
if (error) {
pr_err("Cannot get swap writer\n");