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Commit 651ca7f4 authored by Paul Burton's avatar Paul Burton Committed by Ralf Baechle
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MIPS: print MAAR configuration during boot 



Verifying that the MAAR configuration is as expected is useful when
debugging the performance of a system. Print out the memory regions
configured via MAAR along with their attributes.

Signed-off-by: default avatarPaul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: David Hildenbrand <dahi@linux.vnet.ibm.com>
Cc: linux-kernel@vger.kernel.org
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Patchwork: https://patchwork.linux-mips.org/patch/11238/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent def3ab5d

arch/mips/mm/init.c

+29 −0
Original line number Original line Diff line number Diff line
@@ -291,6 +291,7 @@ unsigned __weak platform_maar_init(unsigned num_pairs) 
static void maar_init(void)

static void maar_init(void)

{

{

	unsigned num_maars, used, i;

	unsigned num_maars, used, i;

	phys_addr_t lower, upper, attr;





	if (!cpu_has_maar)

	if (!cpu_has_maar)

		return;

		return;
@@ -313,6 +314,34 @@ static void maar_init(void) 
		write_c0_maar(0);

		write_c0_maar(0);

		back_to_back_c0_hazard();

		back_to_back_c0_hazard();

	}

	}



	pr_info("MAAR configuration:\n");

	for (i = 0; i < num_maars; i += 2) {

		write_c0_maari(i);

		back_to_back_c0_hazard();

		upper = read_c0_maar();



		write_c0_maari(i + 1);

		back_to_back_c0_hazard();

		lower = read_c0_maar();



		attr = lower & upper;

		lower = (lower & MIPS_MAAR_ADDR) << 4;

		upper = ((upper & MIPS_MAAR_ADDR) << 4) | 0xffff;



		pr_info("  [%d]: ", i / 2);

		if (!(attr & MIPS_MAAR_V)) {

			pr_cont("disabled\n");

			continue;

		}



		pr_cont("%pa-%pa", &lower, &upper);



		if (attr & MIPS_MAAR_S)

			pr_cont(" speculate");



		pr_cont("\n");

	}

}

}





#ifndef CONFIG_NEED_MULTIPLE_NODES

#ifndef CONFIG_NEED_MULTIPLE_NODES