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69 lines
1.8 KiB
69 lines
1.8 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _XEN_MULTICALLS_H |
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#define _XEN_MULTICALLS_H |
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#include <trace/events/xen.h> |
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#include "xen-ops.h" |
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/* Multicalls */ |
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struct multicall_space |
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{ |
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struct multicall_entry *mc; |
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void *args; |
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}; |
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/* Allocate room for a multicall and its args */ |
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struct multicall_space __xen_mc_entry(size_t args); |
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DECLARE_PER_CPU(unsigned long, xen_mc_irq_flags); |
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/* Call to start a batch of multiple __xen_mc_entry()s. Must be |
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paired with xen_mc_issue() */ |
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static inline void xen_mc_batch(void) |
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{ |
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unsigned long flags; |
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/* need to disable interrupts until this entry is complete */ |
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local_irq_save(flags); |
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trace_xen_mc_batch(paravirt_get_lazy_mode()); |
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__this_cpu_write(xen_mc_irq_flags, flags); |
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} |
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static inline struct multicall_space xen_mc_entry(size_t args) |
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{ |
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xen_mc_batch(); |
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return __xen_mc_entry(args); |
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} |
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/* Flush all pending multicalls */ |
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void xen_mc_flush(void); |
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/* Issue a multicall if we're not in a lazy mode */ |
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static inline void xen_mc_issue(unsigned mode) |
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{ |
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trace_xen_mc_issue(mode); |
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if ((paravirt_get_lazy_mode() & mode) == 0) |
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xen_mc_flush(); |
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/* restore flags saved in xen_mc_batch */ |
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local_irq_restore(this_cpu_read(xen_mc_irq_flags)); |
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} |
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/* Set up a callback to be called when the current batch is flushed */ |
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void xen_mc_callback(void (*fn)(void *), void *data); |
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/* |
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* Try to extend the arguments of the previous multicall command. The |
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* previous command's op must match. If it does, then it attempts to |
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* extend the argument space allocated to the multicall entry by |
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* arg_size bytes. |
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* |
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* The returned multicall_space will return with mc pointing to the |
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* command on success, or NULL on failure, and args pointing to the |
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* newly allocated space. |
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*/ |
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struct multicall_space xen_mc_extend_args(unsigned long op, size_t arg_size); |
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#endif /* _XEN_MULTICALLS_H */
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