arm: mm: qsd8x50: Fix incorrect permission faults
Handle incorrectly reported permission faults for qsd8650. On
permission faults, retry MVA to PA conversion. If retry detects
translation fault. Report as translation fault.
Cc: Jamie Lokier <jamie@shareable.org>
Signed-off-by: Dave Estes <cestes@quicinc.com>
diff --git a/arch/arm/mm/abort-ev7.S b/arch/arm/mm/abort-ev7.S
index 2e6dc04..ec88b15 100644
--- a/arch/arm/mm/abort-ev7.S
+++ b/arch/arm/mm/abort-ev7.S
@@ -29,5 +29,26 @@
* V6 code adjusts the returned DFSR.
* New designs should not need to patch up faults.
*/
+
+#if defined(CONFIG_VERIFY_PERMISSION_FAULT)
+ /*
+ * Detect erroneous permission failures and fix
+ */
+ ldr r3, =0x40d @ On permission fault
+ and r3, r1, r3
+ cmp r3, #0x0d
+ movne pc, lr
+
+ mcr p15, 0, r0, c7, c8, 0 @ Retranslate FAR
+ isb
+ mrc p15, 0, r2, c7, c4, 0 @ Read the PAR
+ and r3, r2, #0x7b @ On translation fault
+ cmp r3, #0x0b
+ movne pc, lr
+ bic r1, r1, #0xf @ Fix up FSR FS[5:0]
+ and r2, r2, #0x7e
+ orr r1, r1, r2, LSR #1
+#endif
+
mov pc, lr
ENDPROC(v7_early_abort)