| Message ID | 20241214143039.4139398-1-guoren@kernel.org (mailing list archive) |
|---|---|
| Headers | show |
| Series | riscv: qspinlock: errata: Add ERRATA_THEAD_WRITE_ONCE fixup | expand |
On Sat, Dec 14, 2024 at 09:30:37AM -0500, guoren@kernel.org wrote: > From: Guo Ren <guoren@linux.alibaba.com> > > The early version of T-Head C9xx cores has a store merge buffer > delay problem. The store merge buffer could improve the store queue > performance by merging multi-store requests, but when there are not > continued store requests, the prior single store request would be > waiting in the store queue for a long time. That would cause > significant problems for communication between multi-cores. This > problem was found on sg2042 & th1520 platforms with the qspinlock > lock torture test. > > The orignal patch is from: > https://lore.kernel.org/linux-riscv/20231225125847.2778638-5-guoren@kernel.org/ > > Guo Ren (2): > riscv: Move vendor errata definitions into vendorid_list.h > riscv: qspinlock: errata: Add ERRATA_THEAD_WRITE_ONCE fixup > > arch/riscv/Kconfig.errata | 19 +++++++++++++++ > arch/riscv/errata/thead/errata.c | 20 ++++++++++++++++ > arch/riscv/include/asm/errata_list.h | 17 ------------- > arch/riscv/include/asm/rwonce.h | 33 ++++++++++++++++++++++++++ > arch/riscv/include/asm/vendorid_list.h | 18 ++++++++++++++ > include/asm-generic/rwonce.h | 2 ++ > 6 files changed, 92 insertions(+), 17 deletions(-) > create mode 100644 arch/riscv/include/asm/rwonce.h > > -- > 2.40.1 > It works on SG2042. Tested-by: Inochi Amaoto <inochiama@gmail.com>
From: Guo Ren <guoren@linux.alibaba.com> The early version of T-Head C9xx cores has a store merge buffer delay problem. The store merge buffer could improve the store queue performance by merging multi-store requests, but when there are not continued store requests, the prior single store request would be waiting in the store queue for a long time. That would cause significant problems for communication between multi-cores. This problem was found on sg2042 & th1520 platforms with the qspinlock lock torture test. The orignal patch is from: https://lore.kernel.org/linux-riscv/20231225125847.2778638-5-guoren@kernel.org/ Guo Ren (2): riscv: Move vendor errata definitions into vendorid_list.h riscv: qspinlock: errata: Add ERRATA_THEAD_WRITE_ONCE fixup arch/riscv/Kconfig.errata | 19 +++++++++++++++ arch/riscv/errata/thead/errata.c | 20 ++++++++++++++++ arch/riscv/include/asm/errata_list.h | 17 ------------- arch/riscv/include/asm/rwonce.h | 33 ++++++++++++++++++++++++++ arch/riscv/include/asm/vendorid_list.h | 18 ++++++++++++++ include/asm-generic/rwonce.h | 2 ++ 6 files changed, 92 insertions(+), 17 deletions(-) create mode 100644 arch/riscv/include/asm/rwonce.h