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ANDROID: ipi: Add function to return nr_ipi and ipi_desc

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For implementation of IPI stats, nr_ipi and ipi_desc are useful.
This information helps in getting per cpu IPI count and total
IPI count from vendor module.

Presently, there are no helper functions to get nr_ipi and
ipi_desc on vendor side. And if we do with a new exported symbol
that does kallsyms_lookup_name on each static variable takes
more than 80ms during boot up or for the first access of each
static variable is an overhead.

So lets add helper functions to return nr_ipi and ipi_desc
value to get things done in an efficient way.

Bug: 177393446
Change-Id: I698dbbb0301d4f1529ef7484f25fe7540378008c
Signed-off-by: Prateek Sood <prsood@codeaurora.org>
Signed-off-by: Mukesh Ojha <mojha@codeaurora.org>
This commit is contained in:
Prateek Sood
2021-01-06 21:18:49 +05:30
committed by Mukesh Ojha
parent d52341bb66
commit 8f15907b74
2 changed files with 14 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm64/include/asm/smp.h
View File

@@ -89,6 +89,8 @@ extern void secondary_entry(void);
extern void arch_send_call_function_single_ipi(int cpu);
extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
extern int nr_ipi_get(void);
extern struct irq_desc **ipi_desc_get(void);
#ifdef CONFIG_ARM64_ACPI_PARKING_PROTOCOL
extern void arch_send_wakeup_ipi_mask(const struct cpumask *mask);

12
arch/arm64/kernel/smp.c
View File

@@ -1188,3 +1188,15 @@ bool cpus_are_stuck_in_kernel(void)
return !!cpus_stuck_in_kernel || smp_spin_tables;
}
int nr_ipi_get(void)
{
return nr_ipi;
}
EXPORT_SYMBOL_GPL(nr_ipi_get);
struct irq_desc **ipi_desc_get(void)
{
return ipi_desc;
}
EXPORT_SYMBOL_GPL(ipi_desc_get);