diff options
| author | Michael Kelley <mikelley@microsoft.com> | 2021-03-02 13:38:22 -0800 |
|---|---|---|
| committer | Wei Liu <wei.liu@kernel.org> | 2021-03-08 17:33:00 +0000 |
| commit | ec866be6ec547c9e1cc4451f04250e08b5fe67c7 (patch) | |
| tree | b1567f609b7f45ebd76863706de0eade32ded692 /include/clocksource | |
| parent | 4c78738ead4e195c7032c31fe56135c1b00e1784 (diff) | |
| download | lwn-ec866be6ec547c9e1cc4451f04250e08b5fe67c7.tar.gz lwn-ec866be6ec547c9e1cc4451f04250e08b5fe67c7.zip | |
clocksource/drivers/hyper-v: Move handling of STIMER0 interrupts
STIMER0 interrupts are most naturally modeled as per-cpu IRQs. But
because x86/x64 doesn't have per-cpu IRQs, the core STIMER0 interrupt
handling machinery is done in code under arch/x86 and Linux IRQs are
not used. Adding support for ARM64 means adding equivalent code
using per-cpu IRQs under arch/arm64.
A better model is to treat per-cpu IRQs as the normal path (which it is
for modern architectures), and the x86/x64 path as the exception. Do this
by incorporating standard Linux per-cpu IRQ allocation into the main
SITMER0 driver code, and bypass it in the x86/x64 exception case. For
x86/x64, special case code is retained under arch/x86, but no STIMER0
interrupt handling code is needed under arch/arm64.
No functional change.
Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/1614721102-2241-11-git-send-email-mikelley@microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Diffstat (limited to 'include/clocksource')
| -rw-r--r-- | include/clocksource/hyperv_timer.h | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/include/clocksource/hyperv_timer.h b/include/clocksource/hyperv_timer.h index 34eef083c988..b6774aa5a4b8 100644 --- a/include/clocksource/hyperv_timer.h +++ b/include/clocksource/hyperv_timer.h @@ -21,8 +21,7 @@ #define HV_MIN_DELTA_TICKS 1 /* Routines called by the VMbus driver */ -extern int hv_stimer_alloc(void); -extern void hv_stimer_free(void); +extern int hv_stimer_alloc(bool have_percpu_irqs); extern int hv_stimer_cleanup(unsigned int cpu); extern void hv_stimer_legacy_init(unsigned int cpu, int sint); extern void hv_stimer_legacy_cleanup(unsigned int cpu); |