summaryrefslogtreecommitdiffstats
path: root/arch/arm64/kernel/sdei.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm64/kernel/sdei.c')
-rw-r--r--arch/arm64/kernel/sdei.c267
1 files changed, 267 insertions, 0 deletions
diff --git a/arch/arm64/kernel/sdei.c b/arch/arm64/kernel/sdei.c
new file mode 100644
index 000000000..48c6457b6
--- /dev/null
+++ b/arch/arm64/kernel/sdei.c
@@ -0,0 +1,267 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2017 Arm Ltd.
+#define pr_fmt(fmt) "sdei: " fmt
+
+#include <linux/arm-smccc.h>
+#include <linux/arm_sdei.h>
+#include <linux/hardirq.h>
+#include <linux/irqflags.h>
+#include <linux/sched/task_stack.h>
+#include <linux/scs.h>
+#include <linux/uaccess.h>
+
+#include <asm/alternative.h>
+#include <asm/exception.h>
+#include <asm/kprobes.h>
+#include <asm/mmu.h>
+#include <asm/ptrace.h>
+#include <asm/sections.h>
+#include <asm/stacktrace.h>
+#include <asm/sysreg.h>
+#include <asm/vmap_stack.h>
+
+unsigned long sdei_exit_mode;
+
+/*
+ * VMAP'd stacks checking for stack overflow on exception using sp as a scratch
+ * register, meaning SDEI has to switch to its own stack. We need two stacks as
+ * a critical event may interrupt a normal event that has just taken a
+ * synchronous exception, and is using sp as scratch register. For a critical
+ * event interrupting a normal event, we can't reliably tell if we were on the
+ * sdei stack.
+ * For now, we allocate stacks when the driver is probed.
+ */
+DECLARE_PER_CPU(unsigned long *, sdei_stack_normal_ptr);
+DECLARE_PER_CPU(unsigned long *, sdei_stack_critical_ptr);
+
+#ifdef CONFIG_VMAP_STACK
+DEFINE_PER_CPU(unsigned long *, sdei_stack_normal_ptr);
+DEFINE_PER_CPU(unsigned long *, sdei_stack_critical_ptr);
+#endif
+
+DECLARE_PER_CPU(unsigned long *, sdei_shadow_call_stack_normal_ptr);
+DECLARE_PER_CPU(unsigned long *, sdei_shadow_call_stack_critical_ptr);
+
+#ifdef CONFIG_SHADOW_CALL_STACK
+DEFINE_PER_CPU(unsigned long *, sdei_shadow_call_stack_normal_ptr);
+DEFINE_PER_CPU(unsigned long *, sdei_shadow_call_stack_critical_ptr);
+#endif
+
+DEFINE_PER_CPU(struct sdei_registered_event *, sdei_active_normal_event);
+DEFINE_PER_CPU(struct sdei_registered_event *, sdei_active_critical_event);
+
+static void _free_sdei_stack(unsigned long * __percpu *ptr, int cpu)
+{
+ unsigned long *p;
+
+ p = per_cpu(*ptr, cpu);
+ if (p) {
+ per_cpu(*ptr, cpu) = NULL;
+ vfree(p);
+ }
+}
+
+static void free_sdei_stacks(void)
+{
+ int cpu;
+
+ if (!IS_ENABLED(CONFIG_VMAP_STACK))
+ return;
+
+ for_each_possible_cpu(cpu) {
+ _free_sdei_stack(&sdei_stack_normal_ptr, cpu);
+ _free_sdei_stack(&sdei_stack_critical_ptr, cpu);
+ }
+}
+
+static int _init_sdei_stack(unsigned long * __percpu *ptr, int cpu)
+{
+ unsigned long *p;
+
+ p = arch_alloc_vmap_stack(SDEI_STACK_SIZE, cpu_to_node(cpu));
+ if (!p)
+ return -ENOMEM;
+ per_cpu(*ptr, cpu) = p;
+
+ return 0;
+}
+
+static int init_sdei_stacks(void)
+{
+ int cpu;
+ int err = 0;
+
+ if (!IS_ENABLED(CONFIG_VMAP_STACK))
+ return 0;
+
+ for_each_possible_cpu(cpu) {
+ err = _init_sdei_stack(&sdei_stack_normal_ptr, cpu);
+ if (err)
+ break;
+ err = _init_sdei_stack(&sdei_stack_critical_ptr, cpu);
+ if (err)
+ break;
+ }
+
+ if (err)
+ free_sdei_stacks();
+
+ return err;
+}
+
+static void _free_sdei_scs(unsigned long * __percpu *ptr, int cpu)
+{
+ void *s;
+
+ s = per_cpu(*ptr, cpu);
+ if (s) {
+ per_cpu(*ptr, cpu) = NULL;
+ scs_free(s);
+ }
+}
+
+static void free_sdei_scs(void)
+{
+ int cpu;
+
+ for_each_possible_cpu(cpu) {
+ _free_sdei_scs(&sdei_shadow_call_stack_normal_ptr, cpu);
+ _free_sdei_scs(&sdei_shadow_call_stack_critical_ptr, cpu);
+ }
+}
+
+static int _init_sdei_scs(unsigned long * __percpu *ptr, int cpu)
+{
+ void *s;
+
+ s = scs_alloc(cpu_to_node(cpu));
+ if (!s)
+ return -ENOMEM;
+ per_cpu(*ptr, cpu) = s;
+
+ return 0;
+}
+
+static int init_sdei_scs(void)
+{
+ int cpu;
+ int err = 0;
+
+ if (!IS_ENABLED(CONFIG_SHADOW_CALL_STACK))
+ return 0;
+
+ for_each_possible_cpu(cpu) {
+ err = _init_sdei_scs(&sdei_shadow_call_stack_normal_ptr, cpu);
+ if (err)
+ break;
+ err = _init_sdei_scs(&sdei_shadow_call_stack_critical_ptr, cpu);
+ if (err)
+ break;
+ }
+
+ if (err)
+ free_sdei_scs();
+
+ return err;
+}
+
+unsigned long sdei_arch_get_entry_point(int conduit)
+{
+ /*
+ * SDEI works between adjacent exception levels. If we booted at EL1 we
+ * assume a hypervisor is marshalling events. If we booted at EL2 and
+ * dropped to EL1 because we don't support VHE, then we can't support
+ * SDEI.
+ */
+ if (is_hyp_nvhe()) {
+ pr_err("Not supported on this hardware/boot configuration\n");
+ goto out_err;
+ }
+
+ if (init_sdei_stacks())
+ goto out_err;
+
+ if (init_sdei_scs())
+ goto out_err_free_stacks;
+
+ sdei_exit_mode = (conduit == SMCCC_CONDUIT_HVC) ? SDEI_EXIT_HVC : SDEI_EXIT_SMC;
+
+#ifdef CONFIG_UNMAP_KERNEL_AT_EL0
+ if (arm64_kernel_unmapped_at_el0()) {
+ unsigned long offset;
+
+ offset = (unsigned long)__sdei_asm_entry_trampoline -
+ (unsigned long)__entry_tramp_text_start;
+ return TRAMP_VALIAS + offset;
+ } else
+#endif /* CONFIG_UNMAP_KERNEL_AT_EL0 */
+ return (unsigned long)__sdei_asm_handler;
+
+out_err_free_stacks:
+ free_sdei_stacks();
+out_err:
+ return 0;
+}
+
+/*
+ * do_sdei_event() returns one of:
+ * SDEI_EV_HANDLED - success, return to the interrupted context.
+ * SDEI_EV_FAILED - failure, return this error code to firmare.
+ * virtual-address - success, return to this address.
+ */
+unsigned long __kprobes do_sdei_event(struct pt_regs *regs,
+ struct sdei_registered_event *arg)
+{
+ u32 mode;
+ int i, err = 0;
+ int clobbered_registers = 4;
+ u64 elr = read_sysreg(elr_el1);
+ u32 kernel_mode = read_sysreg(CurrentEL) | 1; /* +SPSel */
+ unsigned long vbar = read_sysreg(vbar_el1);
+
+ if (arm64_kernel_unmapped_at_el0())
+ clobbered_registers++;
+
+ /* Retrieve the missing registers values */
+ for (i = 0; i < clobbered_registers; i++) {
+ /* from within the handler, this call always succeeds */
+ sdei_api_event_context(i, &regs->regs[i]);
+ }
+
+ err = sdei_event_handler(regs, arg);
+ if (err)
+ return SDEI_EV_FAILED;
+
+ if (elr != read_sysreg(elr_el1)) {
+ /*
+ * We took a synchronous exception from the SDEI handler.
+ * This could deadlock, and if you interrupt KVM it will
+ * hyp-panic instead.
+ */
+ pr_warn("unsafe: exception during handler\n");
+ }
+
+ mode = regs->pstate & (PSR_MODE32_BIT | PSR_MODE_MASK);
+
+ /*
+ * If we interrupted the kernel with interrupts masked, we always go
+ * back to wherever we came from.
+ */
+ if (mode == kernel_mode && !interrupts_enabled(regs))
+ return SDEI_EV_HANDLED;
+
+ /*
+ * Otherwise, we pretend this was an IRQ. This lets user space tasks
+ * receive signals before we return to them, and KVM to invoke it's
+ * world switch to do the same.
+ *
+ * See DDI0487B.a Table D1-7 'Vector offsets from vector table base
+ * address'.
+ */
+ if (mode == kernel_mode)
+ return vbar + 0x280;
+ else if (mode & PSR_MODE32_BIT)
+ return vbar + 0x680;
+
+ return vbar + 0x480;
+}