From 651ca7f4dab77f07fdac9cfb68bcab6bd2b7f827 Mon Sep 17 00:00:00 2001 From: Paul Burton Date: Fri, 25 Sep 2015 08:59:37 -0700 Subject: [PATCH] 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 Cc: linux-mips@linux-mips.org Cc: Steven J. Hill Cc: David Hildenbrand Cc: linux-kernel@vger.kernel.org Cc: Peter Zijlstra (Intel) Patchwork: https://patchwork.linux-mips.org/patch/11238/ Signed-off-by: Ralf Baechle --- arch/mips/mm/init.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) 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 -- 2.34.1