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[PATCHv4,0/2] Improved perf support for imx53/ppd

Message ID 20180212123945.15732-1-sebastian.reichel@collabora.co.uk
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Series Improved perf support for imx53/ppd | expand

Message

Sebastian Reichel Feb. 12, 2018, 12:39 p.m. UTC 
Hi,

This improves perf on imx53 by adding support for enabling the Secure
Debug Enable Register (SDER) SUNIDEN bit. This unlocks new
functionality:

ppd before patchset# perf stat -e cycles,instructions sleep 1 2>&1 | grep instructions
                 0      instructions              #    0.00  insn per cycle

ppd  after patchset# perf stat -e cycles,instructions sleep 1 2>&1 | grep instructions
            177864      instructions              #    0.05  insn per cycle

Changes since PATCHV3:
 * Use readl_relaxed instead of __raw_readl (and the same for writel)
 * Drop final return in void function
 * Add Reviewed-by from Fabio to 2nd patch
Changes since PATCHv2:
 * Always enable GPC_DBG_EN when kernel configuration allows using perf
   to allow cleanup of the arm-pmu driver.
Changes since PATCHv1:
 * Update DTS patch to reference imx53.dtsi's pmu node
 * Remove a superfluous newline in first patch

-- Sebastian

Sebastian Reichel (2):
  ARM: imx53: add secure-reg-access support for PMU
  ARM: dts: imx53: PPD: Enable secure-reg-access

 arch/arm/boot/dts/imx53-ppd.dts |  4 ++++
 arch/arm/boot/dts/imx53.dtsi    |  2 +-
 arch/arm/mach-imx/mach-imx53.c  | 39 ++++++++++++++++++++++++++++++++++++++-
 3 files changed, 43 insertions(+), 2 deletions(-)