path: root/arch/powerpc/oprofile/common.c
diff options
authorCarl Love <cel@us.ibm.com>2008-12-01 16:18:36 -0800
committerRobert Richter <robert.richter@amd.com>2009-01-08 15:51:55 +0100
commit883823291d22e06736f1056da6d8303291d6bbf9 (patch)
treedfa8a4bba8599b8887b66048532e6360bfc6e870 /arch/powerpc/oprofile/common.c
parent014cef91ecef9d5e85f9c98a2efbf8a8c4710510 (diff)
powerpc/oprofile: IBM CELL: add SPU event profiling support
This patch adds the SPU event based profiling funcitonality for the IBM Cell processor. Previously, the CELL OProfile kernel code supported PPU event, PPU cycle profiling and SPU cycle profiling. The addition of SPU event profiling allows the users to identify where in their SPU code various SPU evnets are occuring. This should help users further identify issues with their code. Note, SPU profiling has some limitations due to HW constraints. Only one event at a time can be used for profiling and SPU event profiling must be time sliced across all of the SPUs in a node. The patch adds a new arch specific file to the OProfile file system. The file has bit 0 set to indicate that the kernel supports SPU event profiling. The user tool must check this file/bit to make sure the kernel supports SPU event profiling before trying to do SPU event profiling. The user tool check is part of the user tool patch for SPU event profiling. Signed-off-by: Carl Love <carll@us.ibm.com> Signed-off-by: Robert Richter <robert.richter@amd.com>
Diffstat (limited to 'arch/powerpc/oprofile/common.c')
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/powerpc/oprofile/common.c b/arch/powerpc/oprofile/common.c
index 17807acb05d..21f16edf6c8 100644
--- a/arch/powerpc/oprofile/common.c
+++ b/arch/powerpc/oprofile/common.c
@@ -132,6 +132,28 @@ static int op_powerpc_create_files(struct super_block *sb, struct dentry *root)
oprofilefs_create_ulong(sb, root, "mmcr0", &sys.mmcr0);
oprofilefs_create_ulong(sb, root, "mmcr1", &sys.mmcr1);
oprofilefs_create_ulong(sb, root, "mmcra", &sys.mmcra);
+ /* create a file the user tool can check to see what level of profiling
+ * support exits with this kernel. Initialize bit mask to indicate
+ * what support the kernel has:
+ * bit 0 - Supports SPU event profiling in addition to PPU
+ * event and cycles; and SPU cycle profiling
+ * bits 1-31 - Currently unused.
+ *
+ * If the file does not exist, then the kernel only supports SPU
+ * cycle profiling, PPU event and cycle profiling.
+ */
+ oprofilefs_create_ulong(sb, root, "cell_support", &sys.cell_support);
+ sys.cell_support = 0x1; /* Note, the user OProfile tool must check
+ * that this bit is set before attempting to
+ * user SPU event profiling. Older kernels
+ * will not have this file, hence the user
+ * tool is not allowed to do SPU event
+ * profiling on older kernels. Older kernels
+ * will accept SPU events but collected data
+ * is garbage.
+ */
for (i = 0; i < model->num_counters; ++i) {