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Commit adcb8497 authored by Prasad Sodagudi's avatar Prasad Sodagudi
Browse files

arm64: Add TLB conflict fault handler 



Add TLB conflict fault handler and try to handle
gracefully. Check whether TLB fault can be handled
by EL2 and cause panic if EL2 is not able to handle.

Change-Id: I276ec5413411932bd8a67ed4c85ebbf66f4affcf
Signed-off-by: default avatarRunmin Wang <runminw@codeaurora.org>
Signed-off-by: default avatarPrasad Sodagudi <psodagud@codeaurora.org>
parent ccf3c894

arch/arm64/mm/fault.c

+19 −1
Original line number Diff line number Diff line
@@ -39,6 +39,7 @@ 
#include <asm/pgtable.h>

#include <asm/tlbflush.h>

#include <asm/edac.h>

#include <soc/qcom/scm.h>



#include <trace/events/exception.h>
@@ -408,6 +409,23 @@ no_context: 
	return 0;

}



static int do_tlb_conf_fault(unsigned long addr,

				unsigned int esr,

				struct pt_regs *regs)

{

#define SCM_TLB_CONFLICT_CMD	0x1B

	struct scm_desc desc = {

		.args[0] = addr,

		.arginfo = SCM_ARGS(1),

	};



	if (scm_call2_atomic(SCM_SIP_FNID(SCM_SVC_MP, SCM_TLB_CONFLICT_CMD),

						&desc))

		return 1;



	return 0;

}



/*

 * First Level Translation Fault Handler

 *
@@ -499,7 +517,7 @@ static struct fault_info { 
	{ do_bad,		SIGBUS,  0,		"unknown 45"			},

	{ do_bad,		SIGBUS,  0,		"unknown 46"			},

	{ do_bad,		SIGBUS,  0,		"unknown 47"			},

	{ do_bad,		SIGBUS,  0,		"TLB conflict abort"		},

	{ do_tlb_conf_fault,	SIGBUS,  0,		"TLB conflict abort"		},

	{ do_bad,		SIGBUS,  0,		"unknown 49"			},

	{ do_bad,		SIGBUS,  0,		"unknown 50"			},

	{ do_bad,		SIGBUS,  0,		"unknown 51"			},