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88 lines
1.6 KiB
88 lines
1.6 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/percpu.h> |
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#include <linux/jump_label.h> |
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#include <asm/trace.h> |
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#include <asm/asm-prototypes.h> |
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#ifdef CONFIG_JUMP_LABEL |
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struct static_key opal_tracepoint_key = STATIC_KEY_INIT; |
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int opal_tracepoint_regfunc(void) |
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{ |
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static_key_slow_inc(&opal_tracepoint_key); |
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return 0; |
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} |
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void opal_tracepoint_unregfunc(void) |
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{ |
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static_key_slow_dec(&opal_tracepoint_key); |
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} |
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#else |
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/* |
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* We optimise OPAL calls by placing opal_tracepoint_refcount |
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* directly in the TOC so we can check if the opal tracepoints are |
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* enabled via a single load. |
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*/ |
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/* NB: reg/unreg are called while guarded with the tracepoints_mutex */ |
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extern long opal_tracepoint_refcount; |
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int opal_tracepoint_regfunc(void) |
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{ |
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opal_tracepoint_refcount++; |
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return 0; |
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} |
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void opal_tracepoint_unregfunc(void) |
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{ |
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opal_tracepoint_refcount--; |
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} |
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#endif |
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/* |
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* Since the tracing code might execute OPAL calls we need to guard against |
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* recursion. |
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*/ |
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static DEFINE_PER_CPU(unsigned int, opal_trace_depth); |
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void __trace_opal_entry(unsigned long opcode, unsigned long *args) |
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{ |
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unsigned long flags; |
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unsigned int *depth; |
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local_irq_save(flags); |
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depth = this_cpu_ptr(&opal_trace_depth); |
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if (*depth) |
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goto out; |
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(*depth)++; |
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preempt_disable(); |
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trace_opal_entry(opcode, args); |
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(*depth)--; |
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out: |
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local_irq_restore(flags); |
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} |
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void __trace_opal_exit(long opcode, unsigned long retval) |
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{ |
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unsigned long flags; |
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unsigned int *depth; |
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local_irq_save(flags); |
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depth = this_cpu_ptr(&opal_trace_depth); |
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if (*depth) |
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goto out; |
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(*depth)++; |
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trace_opal_exit(opcode, retval); |
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preempt_enable(); |
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(*depth)--; |
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out: |
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local_irq_restore(flags); |
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}
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