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* [PATCH 0/2] eal/riscv: implement prefetch using zicbop
@ 2024-05-30 17:19 Daniel Gregory
  2024-05-30 17:19 ` [PATCH 1/2] eal: add flag to hide generic prefetch_write Daniel Gregory
                   ` (2 more replies)
  0 siblings, 3 replies; 7+ messages in thread
From: Daniel Gregory @ 2024-05-30 17:19 UTC (permalink / raw)
  To: Stanislaw Kardach
  Cc: Bruce Richardson, Tyler Retzlaff, dev, Liang Ma, Punit Agrawal,
	Daniel Gregory

Instructions from RISC-V's Zicbop extension can be used to implement the
rte_prefetch* family of functions. On modern versions of GCC (13.1.0+)
and Clang (17.0.1+), these are emitted by __builtin_prefetch() when the
extension is present.

In order to support older compiler versions, this patchset manually
emits these instructions using inline assembly. To do this, I have added
a new flag, RTE_PREFETCH_WRITE_ARCH_DEFINED, that
(similarly to RTE_WAIT_UNTIL_EQUAL_ARCH_DEFINED) hides the generic
implementation of rte_prefetch*_write.

I am still in the process of acquiring hardware that supports this
extension, so I haven't tested how this affects performance yet.

Daniel Gregory (2):
  eal: add flag to hide generic prefetch_write
  eal/riscv: add support for zicbop extension

 config/riscv/meson.build               |  6 +++
 lib/eal/include/generic/rte_prefetch.h | 47 +++++++++++++--------
 lib/eal/riscv/include/rte_prefetch.h   | 57 ++++++++++++++++++++++++--
 3 files changed, 90 insertions(+), 20 deletions(-)

-- 
2.39.2


^ permalink raw reply	[flat|nested] 7+ messages in thread

end of thread, other threads:[~2024-10-07  7:48 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2024-05-30 17:19 [PATCH 0/2] eal/riscv: implement prefetch using zicbop Daniel Gregory
2024-05-30 17:19 ` [PATCH 1/2] eal: add flag to hide generic prefetch_write Daniel Gregory
2024-05-30 17:19 ` [PATCH 2/2] eal/riscv: add support for zicbop extension Daniel Gregory
2024-05-31  8:49   ` Daniel Gregory
2024-10-05  1:31   ` Stephen Hemminger
2024-10-07  7:48   ` Stanisław Kardach
2024-07-12 17:22 ` [PATCH 0/2] eal/riscv: implement prefetch using zicbop David Marchand

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