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| author | Paul Burton <paul.burton@imgtec.com> | 2015-09-25 15:59:37 (GMT) |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2015-09-27 12:14:47 (GMT) |
| commit | 651ca7f4dab77f07fdac9cfb68bcab6bd2b7f827 (patch) | |
| tree | 281fe7b561d953858181a5e7e7c6328b55d9814f | |
| parent | def3ab5d0a0fe53026c2495b054dcc46cf923dac (diff) | |
| download | linux-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>
| -rw-r--r-- | arch/mips/mm/init.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/arch/mips/mm/init.c b/arch/mips/mm/init.c index 074ac54..023c164 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 |