aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorPunit Agrawal <punit.agrawal@arm.com>2014-11-18 11:41:26 +0000
committerDavid Brown <david.brown@linaro.org>2015-12-03 16:53:45 -0800
commitd25673ceb72d0aca589a488d99af1dd2fcd22640 (patch)
tree392c5e14c9a18710559c7bab74a0a1ddb022e5e1
parent9d11f6fa5cc87425cda2a0dcd1edecc433560afc (diff)
downloadlinux-linaro-stable-d25673ceb72d0aca589a488d99af1dd2fcd22640.tar.gz
arm64: Emulate CP15 Barrier instructions
commit c852f320584600a372646055d8229e063949eee7 upstream. The CP15 barrier instructions (CP15ISB, CP15DSB and CP15DMB) are deprecated in the ARMv7 architecture, superseded by ISB, DSB and DMB instructions respectively. Some implementations may provide the ability to disable the CP15 barriers by disabling the CP15BEN bit in SCTLR_EL1. If not enabled, the encodings for these instructions become undefined. To support legacy software using these instructions, this patch register hooks to - * emulate CP15 barriers and warn the user about their use * toggle CP15BEN in SCTLR_EL1 Signed-off-by: Punit Agrawal <punit.agrawal@arm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: David Brown <david.brown@linaro.org>
-rw-r--r--Documentation/arm64/legacy_instructions.txt5
-rw-r--r--arch/arm64/Kconfig15
-rw-r--r--arch/arm64/include/asm/insn.h2
-rw-r--r--arch/arm64/kernel/armv8_deprecated.c131
-rw-r--r--arch/arm64/kernel/insn.c13
5 files changed, 166 insertions, 0 deletions
diff --git a/Documentation/arm64/legacy_instructions.txt b/Documentation/arm64/legacy_instructions.txt
index 5ab58614b7ed..a3b3da2ec6ed 100644
--- a/Documentation/arm64/legacy_instructions.txt
+++ b/Documentation/arm64/legacy_instructions.txt
@@ -38,3 +38,8 @@ Supported legacy instructions
Node: /proc/sys/abi/swp
Status: Obsolete
Default: Undef (0)
+
+* CP15 Barriers
+Node: /proc/sys/abi/cp15_barrier
+Status: Deprecated
+Default: Emulate (1)
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 6f0548e17594..b62bf4c72d7e 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -203,6 +203,21 @@ config SWP_EMULATION
If unsure, say Y
+config CP15_BARRIER_EMULATION
+ bool "Emulate CP15 Barrier instructions"
+ help
+ The CP15 barrier instructions - CP15ISB, CP15DSB, and
+ CP15DMB - are deprecated in ARMv8 (and ARMv7). It is
+ strongly recommended to use the ISB, DSB, and DMB
+ instructions instead.
+
+ Say Y here to enable software emulation of these
+ instructions for AArch32 userspace code. When this option is
+ enabled, CP15 barrier usage is traced which can help
+ identify software that needs updating.
+
+ If unsure, say Y
+
endif
endmenu
diff --git a/arch/arm64/include/asm/insn.h b/arch/arm64/include/asm/insn.h
index 3ecc57c47c04..e2ff32a93b5c 100644
--- a/arch/arm64/include/asm/insn.h
+++ b/arch/arm64/include/asm/insn.h
@@ -362,6 +362,8 @@ bool aarch32_insn_is_wide(u32 insn);
#define A32_RT2_OFFSET 0
u32 aarch32_insn_extract_reg_num(u32 insn, int offset);
+u32 aarch32_insn_mcr_extract_opc2(u32 insn);
+u32 aarch32_insn_mcr_extract_crm(u32 insn);
#endif /* __ASSEMBLY__ */
#endif /* __ASM_INSN_H */
diff --git a/arch/arm64/kernel/armv8_deprecated.c b/arch/arm64/kernel/armv8_deprecated.c
index 98865a7868f1..401c2e544ede 100644
--- a/arch/arm64/kernel/armv8_deprecated.c
+++ b/arch/arm64/kernel/armv8_deprecated.c
@@ -6,6 +6,7 @@
* published by the Free Software Foundation.
*/
+#include <linux/cpu.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/perf_event.h>
@@ -391,6 +392,133 @@ static struct insn_emulation_ops swp_ops = {
.set_hw_mode = NULL,
};
+static int cp15barrier_handler(struct pt_regs *regs, u32 instr)
+{
+ perf_sw_event(PERF_COUNT_SW_EMULATION_FAULTS, 1, regs, regs->pc);
+
+ switch (arm_check_condition(instr, regs->pstate)) {
+ case ARM_OPCODE_CONDTEST_PASS:
+ break;
+ case ARM_OPCODE_CONDTEST_FAIL:
+ /* Condition failed - return to next instruction */
+ goto ret;
+ case ARM_OPCODE_CONDTEST_UNCOND:
+ /* If unconditional encoding - not a barrier instruction */
+ return -EFAULT;
+ default:
+ return -EINVAL;
+ }
+
+ switch (aarch32_insn_mcr_extract_crm(instr)) {
+ case 10:
+ /*
+ * dmb - mcr p15, 0, Rt, c7, c10, 5
+ * dsb - mcr p15, 0, Rt, c7, c10, 4
+ */
+ if (aarch32_insn_mcr_extract_opc2(instr) == 5)
+ dmb(sy);
+ else
+ dsb(sy);
+ break;
+ case 5:
+ /*
+ * isb - mcr p15, 0, Rt, c7, c5, 4
+ *
+ * Taking an exception or returning from one acts as an
+ * instruction barrier. So no explicit barrier needed here.
+ */
+ break;
+ }
+
+ret:
+ pr_warn_ratelimited("\"%s\" (%ld) uses deprecated CP15 Barrier instruction at 0x%llx\n",
+ current->comm, (unsigned long)current->pid, regs->pc);
+
+ regs->pc += 4;
+ return 0;
+}
+
+#define SCTLR_EL1_CP15BEN (1 << 5)
+
+static inline void config_sctlr_el1(u32 clear, u32 set)
+{
+ u32 val;
+
+ asm volatile("mrs %0, sctlr_el1" : "=r" (val));
+ val &= ~clear;
+ val |= set;
+ asm volatile("msr sctlr_el1, %0" : : "r" (val));
+}
+
+static void enable_cp15_ben(void *info)
+{
+ config_sctlr_el1(0, SCTLR_EL1_CP15BEN);
+}
+
+static void disable_cp15_ben(void *info)
+{
+ config_sctlr_el1(SCTLR_EL1_CP15BEN, 0);
+}
+
+static int cpu_hotplug_notify(struct notifier_block *b,
+ unsigned long action, void *hcpu)
+{
+ switch (action) {
+ case CPU_STARTING:
+ case CPU_STARTING_FROZEN:
+ enable_cp15_ben(NULL);
+ return NOTIFY_DONE;
+ case CPU_DYING:
+ case CPU_DYING_FROZEN:
+ disable_cp15_ben(NULL);
+ return NOTIFY_DONE;
+ }
+
+ return NOTIFY_OK;
+}
+
+static struct notifier_block cpu_hotplug_notifier = {
+ .notifier_call = cpu_hotplug_notify,
+};
+
+static int cp15_barrier_set_hw_mode(bool enable)
+{
+ if (enable) {
+ register_cpu_notifier(&cpu_hotplug_notifier);
+ on_each_cpu(enable_cp15_ben, NULL, true);
+ } else {
+ unregister_cpu_notifier(&cpu_hotplug_notifier);
+ on_each_cpu(disable_cp15_ben, NULL, true);
+ }
+
+ return true;
+}
+
+static struct undef_hook cp15_barrier_hooks[] = {
+ {
+ .instr_mask = 0x0fff0fdf,
+ .instr_val = 0x0e070f9a,
+ .pstate_mask = COMPAT_PSR_MODE_MASK,
+ .pstate_val = COMPAT_PSR_MODE_USR,
+ .fn = cp15barrier_handler,
+ },
+ {
+ .instr_mask = 0x0fff0fff,
+ .instr_val = 0x0e070f95,
+ .pstate_mask = COMPAT_PSR_MODE_MASK,
+ .pstate_val = COMPAT_PSR_MODE_USR,
+ .fn = cp15barrier_handler,
+ },
+ { }
+};
+
+static struct insn_emulation_ops cp15_barrier_ops = {
+ .name = "cp15_barrier",
+ .status = INSN_DEPRECATED,
+ .hooks = cp15_barrier_hooks,
+ .set_hw_mode = cp15_barrier_set_hw_mode,
+};
+
/*
* Invoked as late_initcall, since not needed before init spawned.
*/
@@ -399,6 +527,9 @@ static int __init armv8_deprecated_init(void)
if (IS_ENABLED(CONFIG_SWP_EMULATION))
register_insn_emulation(&swp_ops);
+ if (IS_ENABLED(CONFIG_CP15_BARRIER_EMULATION))
+ register_insn_emulation(&cp15_barrier_ops);
+
register_insn_emulation_sysctl(ctl_abi);
return 0;
diff --git a/arch/arm64/kernel/insn.c b/arch/arm64/kernel/insn.c
index 23ad9c1e0109..7e9327a0986d 100644
--- a/arch/arm64/kernel/insn.c
+++ b/arch/arm64/kernel/insn.c
@@ -973,3 +973,16 @@ u32 aarch32_insn_extract_reg_num(u32 insn, int offset)
{
return (insn & (0xf << offset)) >> offset;
}
+
+#define OPC2_MASK 0x7
+#define OPC2_OFFSET 5
+u32 aarch32_insn_mcr_extract_opc2(u32 insn)
+{
+ return (insn & (OPC2_MASK << OPC2_OFFSET)) >> OPC2_OFFSET;
+}
+
+#define CRM_MASK 0xf
+u32 aarch32_insn_mcr_extract_crm(u32 insn)
+{
+ return insn & CRM_MASK;
+}