commit 4f5a0d9c4419f3b88586d665272eb35f270a0551

Author: Maynard Johnson <maynardj@us.ibm.com>

Date:   Tue Dec 17 16:04:33 2013 -0600

    Allow all native events for IBM POWER8 in POWER7 compat mode

    Certain older Linux distributions will support the new IBM POWER8

    processor, but only in a limited mode, since much of the new

    kernel code needed to fully support the POWER8 was not backported

    to these older distros.  This limited mode is referred to as

    "POWER7 compat mode" since the kernel can support only the features

    that were also available on that earlier IBM processor.

    Changes I originally made to support POWER8 assumed that there

    would not be full POWER8 performance monitor unit capabilities when

    in POWER7 compat mode, and thus, the current oprofile code supports

    only a limited subset of POWER8 events (i.e., events which were also

    available on the POWER7). However, I've recently been made aware

    that these older distros actually do have complete backports of the

    POWER8 perf_events kernel subsystem code, making them fully aware of

    all POWER8 events. This patch allows operf and ocount to use all

    of the POWER8 events, regardless of what mode or distribution we

    are running on.

    Signed-off-by: Maynard Johnson <maynardj@us.ibm.com>

diff --git a/libop/op_cpu_type.c b/libop/op_cpu_type.c

index 4bb34b7..cd75ad4 100644

--- a/libop/op_cpu_type.c

+++ b/libop/op_cpu_type.c

@@ -290,7 +290,16 @@ static op_cpu _try_ppc64_arch_generic_cpu(void)

 			}

 		}

 		if (!platforms_are_equivalent) {

-			if (strcmp(platform, "power7") == 0)

+			//  FIXME

+			/* For POWER8 running in POWER7 compat mode (RHEL 6.5 and SLES 11 SP4),

+			 * the kernel will have enough POWER8-specific PMU code so we can utilize

+			 * all of the POWER8 events. In general, this is not necessarily the case

+			 * when running in compat mode.  This code needs to be inspected for every

+			 * new IBM Power processor released, but for now, we'll assume that for the

+			 * next processor model (assuming there will be something like a POWER9?),

+			 * we should use just the architected events when running POWER8 compat mode.

+			 */

+			if (strcmp(platform, "power8") == 0)

 				cpu_type = CPU_PPC64_ARCH_V1;

 		}

 	}

commit 88ed74bade0096042d643a6d7e68c2cbc4b6e34d

Author: Maynard Johnson <maynardj@us.ibm.com>

Date:   Thu Jan 9 15:07:21 2014 -0600

    Fix "Unable to open cpu_type file for reading" for IBM POWER7+

    Using operf to do profiling on an IBM POWER7+ may result in

    the following error message:

    	Unable to open cpu_type file for reading

    This patch fixes the problem.  There is also a simple workaround of

    running 'opcontrol --init'.

    Signed-off-by: Maynard Johnson <maynardj@us.ibm.com>

diff --git a/libop/op_cpu_type.c b/libop/op_cpu_type.c

index cd75ad4..7d5262c 100644

--- a/libop/op_cpu_type.c

+++ b/libop/op_cpu_type.c

@@ -326,6 +326,8 @@ static op_cpu _get_ppc64_cpu_type(void)

 	for (i = 0; i < (int)len ; i++)

 		cpu_name_lowercase[i] = tolower(cpu_name[i]);

+	if (strncmp(cpu_name_lowercase, "power7+", 7) == 0)

+		cpu_name_lowercase[6] = '\0';

 	cpu_type_str[0] = '\0';

 	strcat(cpu_type_str, "ppc64/");

 	strncat(cpu_type_str, cpu_name_lowercase, len);

commit 65176cb1af0fb1f6c7d3ddba4ab5f5f23c5f7c62

Author: Maynard Johnson <maynardj@us.ibm.com>

Date:   Tue Jan 21 14:43:02 2014 -0600

    Fix regression in IBM POWER8 running in POWER7 compat mode

    A commit made on Dec 17, 2013 ("Allow all native events for IBM POWER8

    in POWER7 compat mode) broke support for POWER8 in POWER7 compat mode.

    Instead, oprofile attempts to treat it as a normal POWER7 processor,

    which is not correct.  A user reported the following error when

    running operf with the default CYCLES event:

       terminate called after throwing an instance of 'std::runtime_error'

         what():  libpfm cannot find event code for CYCLES; cannot continue

       Aborted

    This patch fixes this problem.

    Signed-off-by: Maynard Johnson <maynardj@us.ibm.com>

diff --git a/libop/op_cpu_type.c b/libop/op_cpu_type.c

index a3ad804..2907f36 100644

--- a/libop/op_cpu_type.c

+++ b/libop/op_cpu_type.c

@@ -300,7 +300,9 @@ static op_cpu _try_ppc64_arch_generic_cpu(void)

 			 * next processor model (assuming there will be something like a POWER9?),

 			 * we should use just the architected events when running POWER8 compat mode.

 			 */

-			if (strcmp(platform, "power8") == 0)

+			if ((strcmp(platform, "power7") == 0) && (strcmp(base_platform, "power8") == 0))

+				cpu_type = CPU_PPC64_POWER8;

+			else

 				cpu_type = CPU_PPC64_ARCH_V1;

 		}

 	}

commit 7243fa4ed8a25c6e59225a863fd263ce70989087

Author: Maynard Johnson <maynardj@us.ibm.com>

Date:   Tue Feb 4 08:27:10 2014 -0600

    Make cpu type POWER8E equivalent to POWER8

    Recent mainline kernel changes resulted in a cpu type of

    "POWER8E" being displayed in /proc/cpuinfo for certain revisions

    of the IBM POWER8 processor model. But for profiling and

    counting of native events, we can ignore the differences between

    POWER8 and POWER8E.  This patch addresses that issue.

    Signed-off-by: Maynard Johnson <maynardj@us.ibm.com>

diff --git a/libop/op_cpu_type.c b/libop/op_cpu_type.c

index 2907f36..1ae2913 100644

--- a/libop/op_cpu_type.c

+++ b/libop/op_cpu_type.c

@@ -331,6 +331,9 @@ static op_cpu _get_ppc64_cpu_type(void)

 	if (strncmp(cpu_name_lowercase, "power7+", 7) == 0)

 		cpu_name_lowercase[6] = '\0';

+	if (strncmp(cpu_name_lowercase, "power8e", 7) == 0)

+		cpu_name_lowercase[6] = '\0';

+

 	cpu_type_str[0] = '\0';

 	strcat(cpu_type_str, "ppc64/");

 	strncat(cpu_type_str, cpu_name_lowercase, len);