diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2023-08-09 01:04:19 +0300 |
|---|---|---|
| committer | Dave Hansen <dave.hansen@linux.intel.com> | 2023-08-09 22:00:46 +0300 |
| commit | bef4f379e953af49a9bd81790954e78fcb264920 (patch) | |
| tree | 6f12836bb19fccaba438dc686b7aa3bbf73cb156 /arch/x86/include/asm/apic.h | |
| parent | 3b5244bef15e0ec2b51ae5ea4182e1b674d01551 (diff) | |
| download | linux-bef4f379e953af49a9bd81790954e78fcb264920.tar.xz | |
x86/apic: Provide apic_update_callback()
There are already two variants of update mechanism for particular callbacks
and virtualization just writes into the data structure.
Provide an interface and use a shadow data structure to preserve callbacks
so they can be reapplied when the APIC driver is replaced.
The extra data structure is intentional as any new callback needs to be
also updated in the core code. This also prepares for static calls.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Michael Kelley <mikelley@microsoft.com>
Tested-by: Sohil Mehta <sohil.mehta@intel.com>
Tested-by: Juergen Gross <jgross@suse.com> # Xen PV (dom0 and unpriv. guest)
Diffstat (limited to 'arch/x86/include/asm/apic.h')
| -rw-r--r-- | arch/x86/include/asm/apic.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h index 90814ec84540..6e279c1b380d 100644 --- a/arch/x86/include/asm/apic.h +++ b/arch/x86/include/asm/apic.h @@ -308,6 +308,23 @@ struct apic { char *name; }; +struct apic_override { + void (*eoi)(void); + void (*native_eoi)(void); + void (*write)(u32 reg, u32 v); + u32 (*read)(u32 reg); + void (*send_IPI)(int cpu, int vector); + void (*send_IPI_mask)(const struct cpumask *mask, int vector); + void (*send_IPI_mask_allbutself)(const struct cpumask *msk, int vec); + void (*send_IPI_allbutself)(int vector); + void (*send_IPI_all)(int vector); + void (*send_IPI_self)(int vector); + u64 (*icr_read)(void); + void (*icr_write)(u32 low, u32 high); + int (*wakeup_secondary_cpu)(int apicid, unsigned long start_eip); + int (*wakeup_secondary_cpu_64)(int apicid, unsigned long start_eip); +}; + /* * Pointer to the local APIC driver in use on this system (there's * always just one such driver in use - the kernel decides via an @@ -343,9 +360,17 @@ extern int lapic_can_unplug_cpu(void); #endif #ifdef CONFIG_X86_LOCAL_APIC +extern struct apic_override __x86_apic_override; +void __init apic_setup_apic_calls(void); void __init apic_install_driver(struct apic *driver); +#define apic_update_callback(_callback, _fn) { \ + __x86_apic_override._callback = _fn; \ + apic->_callback = _fn; \ + pr_info("APIC: %s() replaced with %ps()\n", #_callback, _fn); \ +} + static inline u32 apic_read(u32 reg) { return apic->read(reg); @@ -405,6 +430,9 @@ static inline void apic_wait_icr_idle(void) { } static inline u32 safe_apic_wait_icr_idle(void) { return 0; } static inline void apic_set_eoi_cb(void (*eoi)(void)) {} static inline void apic_native_eoi(void) { WARN_ON_ONCE(1); } +static inline void apic_setup_apic_calls(void) { } + +#define apic_update_callback(_callback, _fn) do { } while (0) #endif /* CONFIG_X86_LOCAL_APIC */ |