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author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-02-06 09:39:13 +0100 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-02-06 09:39:13 +0100 |
commit | 17fa87fe5a5141d3c082c5c91e950aca9e0ec701 (patch) | |
tree | 5aea2ff6b9b16b49585684c5f2ce404fe444a9ba /arch/arm/kernel/hw_breakpoint.c | |
parent | checkkconfigsymbols.py: support Kconfig's 'imply' statement (diff) | |
parent | Linux 4.10-rc7 (diff) | |
download | linux-dev-17fa87fe5a5141d3c082c5c91e950aca9e0ec701.tar.xz linux-dev-17fa87fe5a5141d3c082c5c91e950aca9e0ec701.zip |
Merge 4.10-rc7 into char-misc-next
We want the hv and other fixes in here as well to handle merge and
testing issues.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/arm/kernel/hw_breakpoint.c')
-rw-r--r-- | arch/arm/kernel/hw_breakpoint.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/arm/kernel/hw_breakpoint.c b/arch/arm/kernel/hw_breakpoint.c index 188180b5523d..be3b3fbd382f 100644 --- a/arch/arm/kernel/hw_breakpoint.c +++ b/arch/arm/kernel/hw_breakpoint.c @@ -1063,6 +1063,22 @@ static int __init arch_hw_breakpoint_init(void) return 0; } + /* + * Scorpion CPUs (at least those in APQ8060) seem to set DBGPRSR.SPD + * whenever a WFI is issued, even if the core is not powered down, in + * violation of the architecture. When DBGPRSR.SPD is set, accesses to + * breakpoint and watchpoint registers are treated as undefined, so + * this results in boot time and runtime failures when these are + * accessed and we unexpectedly take a trap. + * + * It's not clear if/how this can be worked around, so we blacklist + * Scorpion CPUs to avoid these issues. + */ + if (read_cpuid_part() == ARM_CPU_PART_SCORPION) { + pr_info("Scorpion CPU detected. Hardware breakpoints and watchpoints disabled\n"); + return 0; + } + has_ossr = core_has_os_save_restore(); /* Determine how many BRPs/WRPs are available. */ |