MIPS: print MAAR configuration during boot (651ca7f4) · Commits · 戴 / test

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:

Paul 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:

Ralf Baechle <ralf@linux-mips.org>

arch/mips/mm/init.c

+29 −0

Original line number	Diff line number	Diff line
		@@ -291,6 +291,7 @@ unsigned __weak platform_maar_init(unsigned num_pairs)
		static void maar_init(void)
		{
		unsigned num_maars, used, i;
		phys_addr_t lower, upper, attr;

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

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