Merge patch series "Zacas/Zabha support and qspinlocks"

Alexandre Ghiti <alexghiti@rivosinc.com> says:

This implements [cmp]xchgXX() macros using Zacas and Zabha extensions
and finally uses those newly introduced macros to add support for
qspinlocks: note that this implementation of qspinlocks satisfies the
forward progress guarantee.

It also uses Ziccrse to provide the qspinlock implementation.

Thanks to Guo and Leonardo for their work!

* b4-shazam-merge: (1314 commits)
  riscv: Add qspinlock support
  dt-bindings: riscv: Add Ziccrse ISA extension description
  riscv: Add ISA extension parsing for Ziccrse
  asm-generic: ticket-lock: Add separate ticket-lock.h
  asm-generic: ticket-lock: Reuse arch_spinlock_t of qspinlock
  riscv: Implement xchg8/16() using Zabha
  riscv: Implement arch_cmpxchg128() using Zacas
  riscv: Improve zacas fully-ordered cmpxchg()
  riscv: Implement cmpxchg8/16() using Zabha
  dt-bindings: riscv: Add Zabha ISA extension description
  riscv: Implement cmpxchg32/64() using Zacas
  riscv: Do not fail to build on byte/halfword operations with Zawrs
  riscv: Move cpufeature.h macros into their own header

Link: https://lore.kernel.org/r/20241103145153.105097-1-alexghiti@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/riscv/include/asm/hwcap.h b/arch/riscv/include/asm/hwcap.h
index 8608883da453..08d2a5697466 100644
--- a/arch/riscv/include/asm/hwcap.h
+++ b/arch/riscv/include/asm/hwcap.h
@@ -96,6 +96,8 @@
 #define RISCV_ISA_EXT_SMMPM		87
 #define RISCV_ISA_EXT_SMNPM		88
 #define RISCV_ISA_EXT_SSNPM		89
+#define RISCV_ISA_EXT_ZABHA		90
+#define RISCV_ISA_EXT_ZICCRSE		91
 
 #define RISCV_ISA_EXT_XLINUXENVCFG	127