[PATCH v3 07/16] cxl: Add new header for call backs and structs
From: Michael Neuling <hidden>
Date: 2014-10-07 10:49:37
Also in:
lkml
Subsystem:
the rest · Maintainer:
Linus Torvalds
From: Ian Munsie <redacted> This new header adds callbacks and structs needed by the rest of the kernel to hook into the cxl infrastructure. cxl_ctx_get/put/in_use are static inlined here as they are called in tlbie which we want to be fast (mpe's suggestion). Empty functions are provided when CONFIG_CXL_BASE is not enabled. Signed-off-by: Ian Munsie <redacted> Signed-off-by: Michael Neuling <redacted> --- include/misc/cxl.h | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 include/misc/cxl.h
diff --git a/include/misc/cxl.h b/include/misc/cxl.h
new file mode 100644
index 0000000..10cb742
--- /dev/null
+++ b/include/misc/cxl.h@@ -0,0 +1,48 @@ +/* + * Copyright 2014 IBM Corp. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#ifndef _MISC_CXL_H +#define _MISC_CXL_H + +#define CXL_IRQ_RANGES 4 + +struct cxl_irq_ranges { + irq_hw_number_t offset[CXL_IRQ_RANGES]; + irq_hw_number_t range[CXL_IRQ_RANGES]; +}; + +#ifdef CONFIG_CXL_BASE + +extern atomic_t cxl_use_count; + +static inline bool cxl_ctx_in_use(void) +{ + return (atomic_read(&cxl_use_count) != 0); +} + +static inline void cxl_ctx_get(void) +{ + atomic_inc(&cxl_use_count); +} + +static inline void cxl_ctx_put(void) +{ + atomic_dec(&cxl_use_count); +} + +void cxl_slbia(struct mm_struct *mm); + +#else /* CONFIG_CXL_BASE */ + +static inline bool cxl_ctx_in_use(void) { return false; } +static inline void cxl_slbia(struct mm_struct *mm) {} + +#endif /* CONFIG_CXL_BASE */ + +#endif
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1.9.1