diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2020-08-06 14:36:20 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2020-08-06 16:13:13 +0200 |
| commit | b3545192e2b4647234254c5122f8cbfddbcbdaa0 (patch) | |
| tree | 734659cd75af8ea8418c9d5f978c6622b478ebc6 /arch/ia64/include/asm/xtp.h | |
| parent | 13c01139b17163c9b2aa543a9c39f8bbc875b625 (diff) | |
locking, arch/ia64: Reduce <asm/smp.h> header dependencies by moving XTP bits into the new <asm/xtp.h> header
We want to remove the #include <asm/io.h> from <asm/smp.h>, but for this
we have to move the XTP bits into a separate header first (as these bits
rely on <asm/io.h> definitions), and include them in the .c files that rely
on those APIs.
Co-developed-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/ia64/include/asm/xtp.h')
| -rw-r--r-- | arch/ia64/include/asm/xtp.h | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/arch/ia64/include/asm/xtp.h b/arch/ia64/include/asm/xtp.h new file mode 100644 index 000000000000..5bf1d70ad860 --- /dev/null +++ b/arch/ia64/include/asm/xtp.h @@ -0,0 +1,46 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_IA64_XTP_H +#define _ASM_IA64_XTP_H + +#include <asm/io.h> + +#ifdef CONFIG_SMP + +#define XTP_OFFSET 0x1e0008 + +#define SMP_IRQ_REDIRECTION (1 << 0) +#define SMP_IPI_REDIRECTION (1 << 1) + +extern unsigned char smp_int_redirect; + +/* + * XTP control functions: + * min_xtp : route all interrupts to this CPU + * normal_xtp: nominal XTP value + * max_xtp : never deliver interrupts to this CPU. + */ + +static inline void +min_xtp (void) +{ + if (smp_int_redirect & SMP_IRQ_REDIRECTION) + writeb(0x00, ipi_base_addr + XTP_OFFSET); /* XTP to min */ +} + +static inline void +normal_xtp (void) +{ + if (smp_int_redirect & SMP_IRQ_REDIRECTION) + writeb(0x08, ipi_base_addr + XTP_OFFSET); /* XTP normal */ +} + +static inline void +max_xtp (void) +{ + if (smp_int_redirect & SMP_IRQ_REDIRECTION) + writeb(0x0f, ipi_base_addr + XTP_OFFSET); /* Set XTP to max */ +} + +#endif /* CONFIG_SMP */ + +#endif /* _ASM_IA64_XTP_Hy */ |