[PATCH v3 9/9] powerpc/watchpoint: Remove 512 byte boundary
From: Ravi Bangoria <hidden>
Date: 2020-07-08 04:52:00
Also in:
lkml
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
Power10 has removed 512 bytes boundary from match criteria. i.e. The watch range can cross 512 bytes boundary. Signed-off-by: Ravi Bangoria <redacted> --- arch/powerpc/kernel/hw_breakpoint.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/kernel/hw_breakpoint.c b/arch/powerpc/kernel/hw_breakpoint.c
index 7a66c370a105..270fbb4d01ce 100644
--- a/arch/powerpc/kernel/hw_breakpoint.c
+++ b/arch/powerpc/kernel/hw_breakpoint.c@@ -418,8 +418,9 @@ static int hw_breakpoint_validate_len(struct arch_hw_breakpoint *hw) if (dawr_enabled()) { max_len = DAWR_MAX_LEN; - /* DAWR region can't cross 512 bytes boundary */ - if (ALIGN_DOWN(start_addr, SZ_512) != ALIGN_DOWN(end_addr - 1, SZ_512)) + /* DAWR region can't cross 512 bytes boundary on p10 predecessors */ + if (!cpu_has_feature(CPU_FTR_ARCH_31) && + (ALIGN_DOWN(start_addr, SZ_512) != ALIGN_DOWN(end_addr - 1, SZ_512))) return -EINVAL; } else if (IS_ENABLED(CONFIG_PPC_8xx)) { /* 8xx can setup a range without limitation */
--
2.26.2