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authorPaul Burton <paul.burton@imgtec.com>2015-09-25 18:59:37 +0300
committerRalf Baechle <ralf@linux-mips.org>2015-09-27 15:14:47 +0300
commit651ca7f4dab77f07fdac9cfb68bcab6bd2b7f827 (patch)
tree281fe7b561d953858181a5e7e7c6328b55d9814f /arch/mips/mm
parentdef3ab5d0a0fe53026c2495b054dcc46cf923dac (diff)
downloadlinux-651ca7f4dab77f07fdac9cfb68bcab6bd2b7f827.tar.xz
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>
Diffstat (limited to 'arch/mips/mm')
-rw-r--r--arch/mips/mm/init.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/arch/mips/mm/init.c b/arch/mips/mm/init.c
index 074ac5459026..023c164b9eb6 100644
--- a/arch/mips/mm/init.c
+++ b/arch/mips/mm/init.c
@@ -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