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LoongArch: Fix hw_breakpoint_control() for watchpoints

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In hw_breakpoint_control(), encode_ctrl_reg() has already encoded the
MWPnCFG3_LoadEn/MWPnCFG3_StoreEn bits in info->ctrl. We don't need to
add (1 << MWPnCFG3_LoadEn | 1 << MWPnCFG3_StoreEn) unconditionally.

Otherwise we can't set read watchpoint and write watchpoint separately.

Cc: stable@vger.kernel.org
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Huacai Chen 2023-08-26 22:21:57 +08:00
parent 656f9aec07
commit 9730870b48
1 changed files with 1 additions and 2 deletions
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3
arch/loongarch/kernel/hw_breakpoint.c
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@ -207,8 +207,7 @@ static int hw_breakpoint_control(struct perf_event *bp,
write_wb_reg(CSR_CFG_CTRL, i, 0, CTRL_PLV_ENABLE);
} else {
ctrl = encode_ctrl_reg(info->ctrl);
write_wb_reg(CSR_CFG_CTRL, i, 1, ctrl | CTRL_PLV_ENABLE |
1 << MWPnCFG3_LoadEn | 1 << MWPnCFG3_StoreEn);
write_wb_reg(CSR_CFG_CTRL, i, 1, ctrl | CTRL_PLV_ENABLE);
}
enable = csr_read64(LOONGARCH_CSR_CRMD);
csr_write64(CSR_CRMD_WE | enable, LOONGARCH_CSR_CRMD);