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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: 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>
This commit is contained in:
Paul Burton 2015-09-25 08:59:37 -07:00 committed by Ralf Baechle
parent def3ab5d0a
commit 651ca7f4da
1 changed files with 29 additions and 0 deletions
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29
arch/mips/mm/init.c
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@ -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