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linux_dsm_epyc7002/arch/sparc/include/asm/backoff.h

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sparc: copy sparc64 specific files to asm-sparc Used the following script to copy the files: cd include set -e SPARC64=`ls asm-sparc64` for FILE in ${SPARC64}; do if [ -f asm-sparc/$FILE ]; then echo $FILE exist in asm-sparc else git mv asm-sparc64/$FILE asm-sparc/$FILE printf "#include <asm-sparc/$FILE>\n" > asm-sparc64/$FILE git add asm-sparc64/$FILE fi done Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
2008-06-20 01:26:19 +07:00
#ifndef _SPARC64_BACKOFF_H
#define _SPARC64_BACKOFF_H
#define BACKOFF_LIMIT (4 * 1024)
#ifdef CONFIG_SMP
#define BACKOFF_SETUP(reg) \
mov 1, reg
sparc64: Make lock backoff really a NOP on UP builds. As noticed by Mikulas Patocka, the backoff macros don't completely nop out for UP builds, we still get a branch always and a delay slot nop. Fix this by making the branch to the backoff spin loop selective, then we can nop out the spin loop completely. Signed-off-by: David S. Miller <davem@davemloft.net>
2010-08-19 12:53:26 +07:00
#define BACKOFF_LABEL(spin_label, continue_label) \
spin_label
sparc: copy sparc64 specific files to asm-sparc Used the following script to copy the files: cd include set -e SPARC64=`ls asm-sparc64` for FILE in ${SPARC64}; do if [ -f asm-sparc/$FILE ]; then echo $FILE exist in asm-sparc else git mv asm-sparc64/$FILE asm-sparc/$FILE printf "#include <asm-sparc/$FILE>\n" > asm-sparc64/$FILE git add asm-sparc64/$FILE fi done Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
2008-06-20 01:26:19 +07:00
#define BACKOFF_SPIN(reg, tmp, label) \
mov reg, tmp; \
sparc64: Fix cpu strand yielding. For atomic backoff, we just loop over an exponentially backed off counter. This is extremely ineffective as it doesn't actually yield the cpu strand so that other competing strands can use the cpu core. In cpus previous to SPARC-T4 we have to do this in a slightly hackish way, by doing an operation with no side effects that also happens to mark the strand as unavailable. The mechanism we choose for this is three reads of the %ccr (condition-code) register into %g0 (the zero register). SPARC-T4 has an explicit "pause" instruction, and we'll make use of that in a subsequent commit. Yield strands also in cpu_relax(). We really should have done this a very long time ago. Signed-off-by: David S. Miller <davem@davemloft.net>
2012-10-28 08:05:20 +07:00
88: rd %ccr, %g0; \
rd %ccr, %g0; \
rd %ccr, %g0; \
brnz,pt tmp, 88b; \
sparc: copy sparc64 specific files to asm-sparc Used the following script to copy the files: cd include set -e SPARC64=`ls asm-sparc64` for FILE in ${SPARC64}; do if [ -f asm-sparc/$FILE ]; then echo $FILE exist in asm-sparc else git mv asm-sparc64/$FILE asm-sparc/$FILE printf "#include <asm-sparc/$FILE>\n" > asm-sparc64/$FILE git add asm-sparc64/$FILE fi done Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
2008-06-20 01:26:19 +07:00
sub tmp, 1, tmp; \
set BACKOFF_LIMIT, tmp; \
cmp reg, tmp; \
bg,pn %xcc, label; \
nop; \
ba,pt %xcc, label; \
sllx reg, 1, reg;
#else
#define BACKOFF_SETUP(reg)
sparc64: Make lock backoff really a NOP on UP builds. As noticed by Mikulas Patocka, the backoff macros don't completely nop out for UP builds, we still get a branch always and a delay slot nop. Fix this by making the branch to the backoff spin loop selective, then we can nop out the spin loop completely. Signed-off-by: David S. Miller <davem@davemloft.net>
2010-08-19 12:53:26 +07:00
#define BACKOFF_LABEL(spin_label, continue_label) \
continue_label
#define BACKOFF_SPIN(reg, tmp, label)
sparc: copy sparc64 specific files to asm-sparc Used the following script to copy the files: cd include set -e SPARC64=`ls asm-sparc64` for FILE in ${SPARC64}; do if [ -f asm-sparc/$FILE ]; then echo $FILE exist in asm-sparc else git mv asm-sparc64/$FILE asm-sparc/$FILE printf "#include <asm-sparc/$FILE>\n" > asm-sparc64/$FILE git add asm-sparc64/$FILE fi done Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
2008-06-20 01:26:19 +07:00
#endif
#endif /* _SPARC64_BACKOFF_H */
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