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Differential D26952

riscv: remove sbi_clear_ipi()
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Authored by mhorne on Oct 25 2020, 10:24 PM.
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kp
jrtc27
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rS367067: riscv: remove sbi_clear_ipi()
Summary

S-mode software has write access to the SIP.SSIP bit, so instead of
making a second round-trip through the SBI we can clear it ourselves.
The SBI spec has deprecated this function for this exactly this reason.

Submitted by: Danjel Q. <dan1222@gmail.com>

Test Plan

Boot to multiuser in QEMU.

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rS FreeBSD src repository - subversion
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Event Timeline

mhorne requested review of this revision.Oct 25 2020, 10:24 PM
mhorne created this revision.
Harbormaster completed remote builds in B34391: Diff 78754.Oct 25 2020, 10:25 PM
kp accepted this revision.Oct 25 2020, 10:31 PM
This revision is now accepted and ready to land.Oct 25 2020, 10:31 PM
jrtc27 added inline comments.Oct 25 2020, 10:38 PM
sys/riscv/riscv/sbi.c
180 ↗(On Diff #78754)

It strikes me that we should probably panic if these fail even for -NODEBUG kernels?

mhorne added inline comments.Oct 25 2020, 10:42 PM
sys/riscv/riscv/sbi.c
180 ↗(On Diff #78754)

Yes we should. I'll see about a patch for that.

Closed by commit rS367067: riscv: remove sbi_clear_ipi() (authored by mhorne). · Explain WhyOct 26 2020, 7:06 PM
This revision was automatically updated to reflect the committed changes.
mhorne added a commit: rS367067: riscv: remove sbi_clear_ipi().
Herald added a subscriber: imp. · View Herald TranscriptOct 26 2020, 7:06 PM

Revision Contents
Changeset List

PathSize
head/
sys/
riscv/
include/
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riscv/
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Diff 78788

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head/sys/riscv/include/sbi.h

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head/sys/riscv/riscv/mp_machdep.c

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head/sys/riscv/riscv/sbi.c

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