Patch "MIPS: cpu-probe: Set the FTLB probability bit on supported cores" has been added to the 3.17-stable tree

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This is a note to let you know that I've just added the patch titled

    MIPS: cpu-probe: Set the FTLB probability bit on supported cores

to the 3.17-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     mips-cpu-probe-set-the-ftlb-probability-bit-on-supported-cores.patch
and it can be found in the queue-3.17 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From cf0a8aa0226da5de88011e7f30eff22a894b2f49 Mon Sep 17 00:00:00 2001
From: Markos Chandras <markos.chandras@xxxxxxxxxx>
Date: Mon, 10 Nov 2014 12:25:34 +0000
Subject: MIPS: cpu-probe: Set the FTLB probability bit on supported cores

From: Markos Chandras <markos.chandras@xxxxxxxxxx>

commit cf0a8aa0226da5de88011e7f30eff22a894b2f49 upstream.

Make use of the Config6/FLTBP bit to set the probability of a TLBWR
instruction to hit the FTLB or the VTLB. A value of 0 (which may be
the default value on certain cores, such as proAptiv or P5600)
means that a TLBWR instruction will never hit the VTLB which
leads to performance limitations since it effectively decreases
the number of available TLB slots.

Signed-off-by: Markos Chandras <markos.chandras@xxxxxxxxxx>
Reviewed-by: James Hogan <james.hogan@xxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
Patchwork: https://patchwork.linux-mips.org/patch/8368/
Signed-off-by: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 arch/mips/include/asm/mipsregs.h |    2 ++
 arch/mips/kernel/cpu-probe.c     |   33 ++++++++++++++++++++++++++++++++-
 2 files changed, 34 insertions(+), 1 deletion(-)

--- a/arch/mips/include/asm/mipsregs.h
+++ b/arch/mips/include/asm/mipsregs.h
@@ -661,6 +661,8 @@
 #define MIPS_CONF6_SYND		(_ULCAST_(1) << 13)
 /* proAptiv FTLB on/off bit */
 #define MIPS_CONF6_FTLBEN	(_ULCAST_(1) << 15)
+/* FTLB probability bits */
+#define MIPS_CONF6_FTLBP_SHIFT	(16)
 
 #define MIPS_CONF7_WII		(_ULCAST_(1) << 31)
 
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -192,6 +192,32 @@ static void set_isa(struct cpuinfo_mips
 static char unknown_isa[] = KERN_ERR \
 	"Unsupported ISA type, c0.config0: %d.";
 
+static unsigned int calculate_ftlb_probability(struct cpuinfo_mips *c)
+{
+
+	unsigned int probability = c->tlbsize / c->tlbsizevtlb;
+
+	/*
+	 * 0 = All TLBWR instructions go to FTLB
+	 * 1 = 15:1: For every 16 TBLWR instructions, 15 go to the
+	 * FTLB and 1 goes to the VTLB.
+	 * 2 = 7:1: As above with 7:1 ratio.
+	 * 3 = 3:1: As above with 3:1 ratio.
+	 *
+	 * Use the linear midpoint as the probability threshold.
+	 */
+	if (probability >= 12)
+		return 1;
+	else if (probability >= 6)
+		return 2;
+	else
+		/*
+		 * So FTLB is less than 4 times bigger than VTLB.
+		 * A 3:1 ratio can still be useful though.
+		 */
+		return 3;
+}
+
 static void set_ftlb_enable(struct cpuinfo_mips *c, int enable)
 {
 	unsigned int config6;
@@ -202,9 +228,14 @@ static void set_ftlb_enable(struct cpuin
 	case CPU_P5600:
 		/* proAptiv & related cores use Config6 to enable the FTLB */
 		config6 = read_c0_config6();
+		/* Clear the old probability value */
+		config6 &= ~(3 << MIPS_CONF6_FTLBP_SHIFT);
 		if (enable)
 			/* Enable FTLB */
-			write_c0_config6(config6 | MIPS_CONF6_FTLBEN);
+			write_c0_config6(config6 |
+					 (calculate_ftlb_probability(c)
+					  << MIPS_CONF6_FTLBP_SHIFT)
+					 | MIPS_CONF6_FTLBEN);
 		else
 			/* Disable FTLB */
 			write_c0_config6(config6 &  ~MIPS_CONF6_FTLBEN);


Patches currently in stable-queue which might be from markos.chandras@xxxxxxxxxx are

queue-3.17/mips-asm-uaccess-add-v1-register-to-clobber-list-on-eva.patch
queue-3.17/mips-cpu-probe-set-the-ftlb-probability-bit-on-supported-cores.patch
queue-3.17/mips-lib-memcpy-restore-nop-on-delay-slot-before-returning-to-caller.patch
queue-3.17/mips-tlbex-fix-potential-htw-race-on-tlbl-m-s-handlers.patch
queue-3.17/mips-tlb-r4k-add-missing-htw-stop-start-sequences.patch
queue-3.17/mips-r4kcache-add-eva-case-for-protected_writeback_dcache_line.patch
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