arm64: defer clearing DAIF.D

For historical reasons we unmask debug exceptions in __cpu_setup(), but
it's not necessary to unmask debug exceptions this early in the
boot/idle entry paths. It would be better to unmask debug exceptions
later in C code as this simplifies the current code and will make it
easier to rework exception masking logic to handle non-DAIF bits in
future (e.g. PSTATE.{ALLINT,PM}).

We started clearing DAIF.D in __cpu_setup() in commit:

  2ce39ad ("arm64: debug: unmask PSTATE.D earlier")

At the time, we needed to ensure that DAIF.D was clear on the primary
CPU before scheduling and preemption were possible, and chose to do this
in __cpu_setup() so that this occurred in the same place for primary and
secondary CPUs. As we cannot handle debug exceptions this early, we
placed an ISB between initializing MDSCR_EL1 and clearing DAIF.D so that
no exceptions should be triggered.

Subsequently we rewrote the return-from-{idle,suspend} paths to use
__cpu_setup() in commit:

  cabe1c8 ("arm64: Change cpu_resume() to enable mmu early then access sleep_sp by va")

... which allowed for earlier use of the MMU and had the desirable
property of using the same code to reset the CPU in the cold and warm
boot paths. This introduced a bug: DAIF.D was clear while
cpu_do_resume() restored MDSCR_EL1 and other control registers (e.g.
breakpoint/watchpoint control/value registers), and so we could
unexpectedly take debug exceptions.

We fixed that in commit:

  744c6c3 ("arm64: kernel: Fix unmasked debug exceptions when restoring mdscr_el1")

... by having cpu_do_resume() use the `disable_dbg` macro to set DAIF.D
before restoring MDSCR_EL1 and other control registers. This relies on
DAIF.D being subsequently cleared again in cpu_resume().

Subsequently we reworked DAIF masking in commit:

  0fbeb31 ("arm64: explicitly mask all exceptions")

... where we began enforcing a policy that DAIF.D being set implies all
other DAIF bits are set, and so e.g. we cannot take an IRQ while DAIF.D
is set. As part of this the use of `disable_dbg` in cpu_resume() was
replaced with `disable_daif` for consistency with the rest of the
kernel.

These days, there's no need to clear DAIF.D early within __cpu_setup():

* setup_arch() clears DAIF.DA before scheduling and preemption are
  possible on the primary CPU, avoiding the problem we we originally
  trying to work around.

  Note: DAIF.IF get cleared later when interrupts are enabled for the
  first time.

* secondary_start_kernel() clears all DAIF bits before scheduling and
  preemption are possible on secondary CPUs.

  Note: with pseudo-NMI, the PMR is initialized here before any DAIF
  bits are cleared. Similar will be necessary for the architectural NMI.

* cpu_suspend() restores all DAIF bits when returning from idle,
  ensuring that we don't unexpectedly leave DAIF.D clear or set.

  Note: with pseudo-NMI, the PMR is initialized here before DAIF is
  cleared. Similar will be necessary for the architectural NMI.

This patch removes the unmasking of debug exceptions from __cpu_setup(),
relying on the above locations to initialize DAIF. This allows some
other cleanups:

* It is no longer necessary for cpu_resume() to explicitly mask debug
  (or other) exceptions, as it is always called with all DAIF bits set.
  Thus we drop the use of `disable_daif`.

* The `enable_dbg` macro is no longer used, and so is dropped.

* It is no longer necessary to have an ISB immediately after
  initializing MDSCR_EL1 in __cpu_setup(), and we can revert to relying
  on the context synchronization that occurs when the MMU is enabled
  between __cpu_setup() and code which clears DAIF.D

Comments are added to setup_arch() and secondary_start_kernel() to
explain the initial unmasking of the DAIF bits.

Signed-off-by: Mark Rutland <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Mark Brown <[email protected]>
Cc: Will Deacon <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

Author: mrutland-arm

arch/arm64/include/asm/assembler.h

@@ -50,10 +50,6 @@
 	msr	daif, \flags
 	.endm
 
-	.macro	enable_dbg
-	msr	daifclr, #8
-	.endm
-
 	.macro	disable_step_tsk, flgs, tmp
 	tbz	\flgs, #TIF_SINGLESTEP, 9990f
 	mrs	\tmp, mdscr_el1

arch/arm64/kernel/setup.c

@@ -298,8 +298,15 @@ void __init __no_sanitize_address setup_arch(char **cmdline_p)
 	dynamic_scs_init();
 
 	/*
-	 * Unmask SError as soon as possible after initializing earlycon so
-	 * that we can report any SErrors immediately.
+	 * The primary CPU enters the kernel with all DAIF exceptions masked.
+	 *
+	 * We must unmask Debug and SError before preemption or scheduling is
+	 * possible to ensure that these are consistently unmasked across
+	 * threads, and we want to unmask SError as soon as possible after
+	 * initializing earlycon so that we can report any SErrors immediately.
+	 *
+	 * IRQ and FIQ will be unmasked after the root irqchip has been
+	 * detected and initialized.
 	 */
 	local_daif_restore(DAIF_PROCCTX_NOIRQ);
 

arch/arm64/kernel/smp.c

@@ -264,6 +264,13 @@ asmlinkage notrace void secondary_start_kernel(void)
 	set_cpu_online(cpu, true);
 	complete(&cpu_running);
 
+	/*
+	 * Secondary CPUs enter the kernel with all DAIF exceptions masked.
+	 *
+	 * As with setup_arch() we must unmask Debug and SError exceptions, and
+	 * as the root irqchip has already been detected and initialized we can
+	 * unmask IRQ and FIQ at the same time.
+	 */
 	local_daif_restore(DAIF_PROCCTX);
 
 	/*

arch/arm64/mm/proc.S

@@ -135,14 +135,6 @@ SYM_FUNC_START(cpu_do_resume)
 
 	msr	tcr_el1, x8
 	msr	vbar_el1, x9
-
-	/*
-	 * __cpu_setup() cleared MDSCR_EL1.MDE and friends, before unmasking
-	 * debug exceptions. By restoring MDSCR_EL1 here, we may take a debug
-	 * exception. Mask them until local_daif_restore() in cpu_suspend()
-	 * resets them.
-	 */
-	disable_daif
 	msr	mdscr_el1, x10
 
 	msr	sctlr_el1, x12
@@ -466,8 +458,6 @@ SYM_FUNC_START(__cpu_setup)
 	msr	cpacr_el1, xzr			// Reset cpacr_el1
 	mov	x1, #1 << 12			// Reset mdscr_el1 and disable
 	msr	mdscr_el1, x1			// access to the DCC from EL0
-	isb					// Unmask debug exceptions now,
-	enable_dbg				// since this is per-cpu
 	reset_pmuserenr_el0 x1			// Disable PMU access from EL0
 	reset_amuserenr_el0 x1			// Disable AMU access from EL0