BMC/Intel-BMC/linux.git/arch/arm/kernel/perf_event_v7.c, branch dev

arm: perf: factor out armv7 pmu driver

2015-05-28T15:54:18+00:00

Now that the core arm perf code maintains no global state and all microarchitecture-specific PMU data can be fed in through the shared probe function, it's possible to use it as a library and get rid of the C file includes we have currently. This patch factors out the ARMv7-specific portions out into the ARMv7 driver. For the moment this is always built if perf event support is enabled, but the preprocessor guards will leave behind an empty file. Now that perf_event_cpu.c contains no microarchitecture-specific data, the associated probing code is removed, completing its relegation to a library file. The vestigal "arm-pmu" platform device ID is removed in this patch, as it has been unused since platform files were updated to specify a more specific PMU variant. Signed-off-by: Mark Rutland Signed-off-by: Will Deacon

arm: perf: probe number of counters on affine CPUs

2015-05-27T15:12:36+00:00

In heterogeneous systems, the number of counters may differ across clusters. To find the number of counters for a cluster, we must probe the PMU from a CPU in that cluster. Reviewed-by: Will Deacon Signed-off-by: Mark Rutland Signed-off-by: Will Deacon

ARM: perf: Add support for Scorpion PMUs

2015-03-17T18:34:01+00:00

Scorpion supports a set of local performance monitor event selection registers (LPM) sitting behind a cp15 based interface that extend the architected PMU events to include Scorpion CPU and Venum VFP specific events. To use these events the user is expected to program the lpm register with the event code shifted into the group they care about and then point the PMNx event at that region+group combo by writing a LPMn_GROUPx event. Add support for this hardware. Note: the raw event number is a pure software construct that allows us to map the multi-dimensional number space of regions, groups, and event codes into a flat event number space suitable for use by the perf framework. This is based on code originally written by Sheetal Sahasrabudhe, Ashwin Chaugule, and Neil Leeder [1]. [1] https://www.codeaurora.org/cgit/quic/la/kernel/msm/tree/arch/arm/kernel/perf_event_msm.c?h=msm-3.4 Cc: Mark Rutland Cc: Neil Leeder Cc: Ashwin Chaugule Cc: Sheetal Sahasrabudhe Cc: Signed-off-by: Stephen Boyd Signed-off-by: Will Deacon

ARM: perf: Only reset PMxEVCNTCR registers on reset

2015-03-17T18:34:01+00:00

The Krait specific PMxEVCNTCR register is unpredictable upon reset. Currently we clear the register before we setup an event, but we don't need to do that. Instead, we can iterate through all the events and clear them once when we reset the PMU, saving a write in the event setup path. Cc: Neil Leeder Cc: Ashwin Chaugule Cc: Sheetal Sahasrabudhe Signed-off-by: Stephen Boyd Signed-off-by: Will Deacon

ARM: perf: Preparatory work for Scorpion PMU support

2015-03-17T18:34:01+00:00

Do some things to make the Krait PMU support code generic enough to be used by the Scorpion PMU support code. * Rename the venum register functions to be venum instead of krait specific because the same registers exist on Scorpion * Add some macros to decode our Krait specific event encoding that's the same on Scorpion (modulo an extra region). * Drop 'krait' from krait_clear_pmresrn_group() so it can be used by Scorpion code Signed-off-by: Stephen Boyd Signed-off-by: Will Deacon

arm: perf: kill get_hw_events()

2014-10-30T12:17:00+00:00

Now that the arm pmu code is limited to CPU PMUs the get_hw_events() function is superfluous, as we'll always have a set of per-cpu pmu_hw_events structures. This patch removes the get_hw_events() function, replacing it with a percpu hw_events pointer. Uses of get_hw_events are updated to use this_cpu_ptr. Signed-off-by: Mark Rutland Reviewed-by: Will Deacon Reviewed-by: Stephen Boyd Signed-off-by: Will Deacon

ARM: perf: use pr_* instead of printk

2014-10-30T12:16:58+00:00

There are a few remaining uses of printk in the ARM perf code, so move them over to the pr_* variants instead. Reported-by: Russell King Signed-off-by: Will Deacon

ARM: perf: remove useless return and check of idx in counter handling

2014-10-30T12:16:58+00:00

Idx sanity check was once implemented separately in these counter handling functions and then return value was treated as a judgement. armv7_pmnc_select_counter() armv7_pmnc_enable_counter() armv7_pmnc_disable_counter() armv7_pmnc_enable_intens() armv7_pmnc_disable_intens() But we do not need to do this now, as idx validation check was moved out all these functions by commit 7279adbd9bb8ef8f(ARM: perf: check ARMv7 counter validity on a per-pmu basis). Let's remove the useless return of idx from these functions. Acked-by: Mark Rutland Signed-off-by: chai wen Signed-off-by: Will Deacon

arm: perf: krait: stop using singleton PMU

2014-07-02T14:48:26+00:00

Currently the krait_pmu_{enable,disable}_event functions use the global cpu_pmu variable while all the other pmu enable/disable functions derive this from the event argument. This patch brings the Krait functions into line with the rest of the PMU backends by deriving the address of the pmu from the event argument. Acked-by: Will Deacon Acked-by: Stephen Boyd Tested-by: Christopher Covington Signed-off-by: Mark Rutland Signed-off-by: Will Deacon

arm: perf: clean up PMU names

2014-07-02T14:48:25+00:00

The perf userspace tools can't handle dashes or spaces in PMU names, which conflicts with the current naming scheme in the arm perf backend. This prevents these PMUs from being accessed by name from the perf tools. Additionally the ARMv6 pmus are named "v6", which does not fully distinguish them in the sys/bus/event_source namespace. This patch renames the PMUs consistently to a lower case form with underscores, e.g. "armv6_1176", "armv7_cortex_a9". This is both readily accepted by today's perf tool, and far easier to type than the (apparently unused) convention in use previously. The OProfile name conversion code is updated to handle this. Due to a copy-paste error involving two "xscale1" entries, "xscale2" has never been matched by the name OProfile name mapping. While we're updating names, this is corrected. Acked-by: Will Deacon Tested-by: Christopher Covington Signed-off-by: Mark Rutland [sachin: fixed missing semicolons in armv6 backend] Signed-off-by: Sachin Kamat Signed-off-by: Will Deacon