linux-toradex.git/drivers/perf/thunderx2_pmu.c, branch v6.7-rc8

perf: Replace acpi_bus_get_device()

2022-02-08T15:14:53+00:00

Replace acpi_bus_get_device() that is going to be dropped with
acpi_fetch_acpi_dev().

No intentional functional impact.

Signed-off-by: Rafael J. Wysocki 
Acked-by: Will Deacon 
Link: https://lore.kernel.org/r/10025610.nUPlyArG6x@kreacher
Signed-off-by: Will Deacon

drivers/perf: thunderx2_pmu: Change data in size tx2_uncore_event_update()

2021-10-04T12:13:11+00:00

A LSL of 32 requires > 32b value to hold the result. However in
tx2_uncore_event_update(), 1UL << 32 currently only works as unsigned
long is 64b on a 64b system.

If we want to compile test for a 32b system, we need unsigned long long,
whose min size is 64b.

Signed-off-by: John Garry 
Link: https://lore.kernel.org/r/1633085326-156653-2-git-send-email-john.garry@huawei.com
Signed-off-by: Will Deacon

drivers/perf: Remove redundant dev_err call in tx2_uncore_pmu_init_dev()

2021-05-25T17:57:19+00:00

There is a error message within devm_ioremap_resource
already, so remove the dev_err call to avoid redundant
error message.

Reported-by: Hulk Robot 
Signed-off-by: Zou Wei 
Link: https://lore.kernel.org/r/1620715364-107460-1-git-send-email-zou_wei@huawei.com
Signed-off-by: Will Deacon

drivers/perf: convert sysfs sprintf family to sysfs_emit

2021-03-25T12:55:44+00:00

sprintf does not know the PAGE_SIZE maximum of the temporary buffer
used for sysfs content and it's possible to overrun the buffer length.

Use sysfs_emit() function to ensures that no overrun is done.

Signed-off-by: Qi Liu 
Link: https://lore.kernel.org/r/1616148273-16374-4-git-send-email-liuqi115@huawei.com
Signed-off-by: Will Deacon

drivers/perf: thunderx2_pmu: Fix memory resource error handling

2020-09-18T13:34:51+00:00

In tx2_uncore_pmu_init_dev(), a call to acpi_dev_get_resources() is used
to create a list _CRS resources which is searched for the device base
address. There is an error check following this:

   if (!rentry->res)
           return NULL

In no case, will rentry->res be NULL, so the test is useless. Even
if the test worked, it comes before the resource list memory is
freed. None of this really matters as long as the ACPI table has
the memory resource. Let's clean it up so that it makes sense and
will give a meaningful error should firmware leave out the memory
resource.

Fixes: 69c32972d593 ("drivers/perf: Add Cavium ThunderX2 SoC UNCORE PMU driver")
Signed-off-by: Mark Salter 
Link: https://lore.kernel.org/r/20200915204110.326138-2-msalter@redhat.com
Signed-off-by: Will Deacon

drivers/perf: Prevent forced unbinding of PMU drivers

2020-07-17T09:51:44+00:00

Forcefully unbinding PMU drivers during perf sampling will lead to
a kernel panic, because the perf upper-layer framework call a NULL
pointer in this situation.

To solve this issue, "suppress_bind_attrs" should be set to true, so
that bind/unbind can be disabled via sysfs and prevent unbinding PMU
drivers during perf sampling.

Signed-off-by: Qi Liu 
Reviewed-by: John Garry 
Link: https://lore.kernel.org/r/1594975763-32966-1-git-send-email-liuqi115@huawei.com
Signed-off-by: Will Deacon

drivers/perf: Add CCPI2 PMU support in ThunderX2 UNCORE driver.

2019-10-29T10:08:46+00:00

CCPI2 is a low-latency high-bandwidth serial interface for inter socket
connectivity of ThunderX2 processors.

CCPI2 PMU supports up to 8 counters per socket. Counters are
independently programmable to different events and can be started and
stopped individually. The CCPI2 counters are 64-bit and do not overflow
in normal operation.

Signed-off-by: Ganapatrao Prabhakerrao Kulkarni 
Signed-off-by: Will Deacon

For drivers that do not support context exclusion let's advertise the

2019-01-21T10:01:24+00:00

PERF_PMU_CAP_NO_EXCLUDE capability. This ensures that perf will
prevent us from handling events where any exclusion flags are set.
Let's also remove the now unnecessary check for exclusion flags.

Signed-off-by: Andrew Murray 
Signed-off-by: Peter Zijlstra (Intel) 
Acked-by: Will Deacon 
Cc: Arnaldo Carvalho de Melo 
Cc: Benjamin Herrenschmidt 
Cc: Borislav Petkov 
Cc: Ivan Kokshaysky 
Cc: Linus Torvalds 
Cc: Mark Rutland 
Cc: Matt Turner 
Cc: Michael Ellerman 
Cc: Paul Mackerras 
Cc: Peter Zijlstra 
Cc: Richard Henderson 
Cc: Russell King 
Cc: Sascha Hauer 
Cc: Shawn Guo 
Cc: Thomas Gleixner 
Cc: linux-arm-kernel@lists.infradead.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: robin.murphy@arm.com
Cc: suzuki.poulose@arm.com
Link: https://lkml.kernel.org/r/1547128414-50693-8-git-send-email-andrew.murray@arm.com
Signed-off-by: Ingo Molnar

drivers/perf: Add Cavium ThunderX2 SoC UNCORE PMU driver

2018-12-06T13:03:17+00:00

This patch adds a perf driver for the PMU UNCORE devices DDR4 Memory
Controller(DMC) and Level 3 Cache(L3C). Each PMU supports up to 4
counters. All counters lack overflow interrupt and are
sampled periodically.

Reviewed-by: Suzuki K Poulose 
Signed-off-by: Ganapatrao Kulkarni 
[will: consistent enum cpuhp_state naming]
Signed-off-by: Will Deacon