[Patch 1/3] User OProfile support for the IBM CELL processor SPU event profiling
Carl Love
cel at us.ibm.com
Tue Dec 2 11:18:30 EST 2008
This patch adds the SPU event profiling support for the IBM Cell
processor to the list of available events. The opcontrol script
patches include a test to see if there is a new cell specific file
in the kernel oprofile file system. If the file exists, then the
kernel supports SPU event profiling.
Signed-off-by: Carl Love <carll at us.ibm.com>
Index: oprofile-cvs/events/ppc64/cell-be/events
===================================================================
--- oprofile-cvs.orig/events/ppc64/cell-be/events
+++ oprofile-cvs/events/ppc64/cell-be/events
@@ -108,12 +108,42 @@ event:0xdbe counters:0,1,2,3 um:PPU_0_cy
event:0xdbf counters:0,1,2,3 um:PPU_0_cycles minimum:10000 name:stb_not_empty : At least one store gather buffer not empty.
# Cell BE Island 4 - Synergistic Processor Unit (SPU)
-
+#
+# OPROFILE FOR CELL ONLY SUPPORTS PROFILING ON ONE SPU EVENT AT A TIME
+#
# CBE Signal Group 41 - SPU (NClk)
+event:0x1004 counters:0 um:SPU_02_cycles minimum:10000 name:dual_instrctn_commit : Dual instruction committed.
+event:0x1005 counters:0 um:SPU_02_cycles minimum:10000 name:sngl_instrctn_commit : Single instruction committed.
+event:0x1006 counters:0 um:SPU_02_cycles minimum:10000 name:ppln0_instrctn_commit : Pipeline 0 instruction committed.
+event:0x1007 counters:0 um:SPU_02_cycles minimum:10000 name:ppln1_instrctn_commit : Pipeline 1 instruction committed.
+event:0x1008 counters:0 um:SPU_02_cycles_or_edges minimum:10000 name:instrctn_ftch_stll : Instruction fetch stall.
+event:0x1009 counters:0 um:SPU_02_cycles_or_edges minimum:10000 name:lcl_strg_bsy : Local storage busy.
+event:0x100A counters:0 um:SPU_02_cycles minimum:10000 name:dma_cnflct_ld_st : DMA may conflict with load or store.
+event:0x100B counters:0 um:SPU_02_cycles minimum:10000 name:str_to_lcl_strg : Store instruction to local storage issued.
+event:0x100C counters:0 um:SPU_02_cycles minimum:10000 name:ld_frm_lcl_strg : Load intruction from local storage issued.
+event:0x100D counters:0 um:SPU_02_cycles minimum:10000 name:fpu_exctn : Floating-Point Unit (FPU) exception.
+event:0x100E counters:0 um:SPU_02_cycles minimum:10000 name:brnch_instrctn_commit : Branch instruction committed.
+event:0x100F counters:0 um:SPU_02_cycles minimum:10000 name:change_of_flow : Non-sequential change of the SPU program counter, which can be caused by branch, asynchronous interrupt, stalled wait on channel, error correction code (ECC) error, and so forth.
+event:0x1010 counters:0 um:SPU_02_cycles minimum:10000 name:brnch_not_tkn : Branch not taken.
+event:0x1011 counters:0 um:SPU_02_cycles minimum:10000 name:brnch_mss_prdctn : Branch miss prediction; not exact. Certain other code sequences can cause additional pulses on this signal (see Note 2).
+event:0x1012 counters:0 um:SPU_02_cycles minimum:10000 name:brnch_hnt_mss_prdctn : Branch hint miss prediction; not exact. Certain other code sequences can cause additional pulses on this signal (see Note 2).
+event:0x1013 counters:0 um:SPU_02_cycles minimum:10000 name:instrctn_seqnc_err : Instruction sequence error.
+event:0x1015 counters:0 um:SPU_02_cycles_or_edges minimum:10000 name:stlld_wait_on_chnl_wrt : Stalled waiting on any blocking channel write (see Note 3).
+event:0x1016 counters:0 um:SPU_02_cycles_or_edges minimum:10000 name:stlld_wait_on_chnl0 : Stalled waiting on External Event Status (Channel 0) (see Note 3).
+event:0x1017 counters:0 um:SPU_02_cycles_or_edges minimum:10000 name:stlld_wait_on_chnl3 : Stalled waiting on Signal Notification 1 (Channel 3) (see Note 3).
+event:0x1018 counters:0 um:SPU_02_cycles_or_edges minimum:10000 name:stlld_wait_on_chnl4 : Stalled waiting on Signal Notification 2 (Channel 4) (see Note 3).
+event:0x1019 counters:0 um:SPU_02_cycles_or_edges minimum:10000 name:stlld_wait_on_chnl21 : Stalled waiting on DMA Command Opcode or ClassID Register (Channel 21) (see Note 3).
+event:0x101A counters:0 um:SPU_02_cycles_or_edges minimum:10000 name:stlld_wait_on_chnl24 : Stalled waiting on Tag Group Status (Channel 24) (see Note 3).
+event:0x101B counters:0 um:SPU_02_cycles_or_edges minimum:10000 name:stlld_wait_on_chnl25 : Stalled waiting on List Stall-and-Notify Tag Status (Channel 25) (see Note 3).
+event:0x101C counters:0 um:SPU_02_cycles_or_edges minimum:10000 name:stlld_wait_on_chnl28 : Stalled waiting on PPU Mailbox (Channel 28) (see Note 3).
+event:0x1022 counters:0 um:SPU_02_cycles_or_edges minimum:10000 name:stlld_wait_on_chnl29 : Stalled waiting on SPU Mailbox (Channel 29) (see Note 3).
+
# CBE Signal Group 42 - SPU Trigger (NClk)
+event:0x10A1 counters:0 um:SPU_Trigger_cycles_or_edges minimum:10000 name:stld_wait_chnl_op : Stalled waiting on channel operation (See Note 2).
# CBE Signal Group 43 - SPU Event (NClk)
+event:0x1107 counters:0 um:SPU_Event_cycles_or_edges minimum:10000 name:instrctn_ftch_stll : Instruction fetch stall.
# Cell BE Island 6 - Element Interconnect Bus (EIB)
Index: oprofile-cvs/events/ppc64/cell-be/unit_masks
===================================================================
--- oprofile-cvs.orig/events/ppc64/cell-be/unit_masks
+++ oprofile-cvs/events/ppc64/cell-be/unit_masks
@@ -72,3 +72,66 @@ name:PPU_0123_cycles type:bitmask defaul
0x002 Positive polarity [default ]
0x030 PPU Bus Word 0/1 [default ]
0x0c0 PPU Bus Word 2/3 [optional ]
+name:SPU_02_cycles type:bitmask default:0x0113
+ 0x0001 Count cycles [mandatory]
+ 0x0000 Negative polarity [optional ]
+ 0x0002 Positive polarity [default ]
+ 0x0110 SPU Bus Word 0 [default ]
+ 0x0140 SPU Bus Word 2 [optional ]
+ 0x0000 SPU 0 [default ]
+ 0x1000 SPU 1 [optional ]
+ 0x2000 SPU 2 [optional ]
+ 0x3000 SPU 3 [optional ]
+ 0x4000 SPU 4 [optional ]
+ 0x5000 SPU 5 [optional ]
+ 0x6000 SPU 6 [optional ]
+ 0x7000 SPU 7 [optional ]
+name:SPU_02_cycles_or_edges type:bitmask default:0x0113
+ 0x0000 Count edges [optional ]
+ 0x0001 Count cycles [default ]
+ 0x0000 Negative polarity [optional ]
+ 0x0002 Positive polarity [default ]
+ 0x0110 SPU Bus Word 0 [default ]
+ 0x0140 SPU Bus Word 2 [optional ]
+ 0x0000 SPU 0 [default ]
+ 0x1000 SPU 1 [optional ]
+ 0x2000 SPU 2 [optional ]
+ 0x3000 SPU 3 [optional ]
+ 0x4000 SPU 4 [optional ]
+ 0x5000 SPU 5 [optional ]
+ 0x6000 SPU 6 [optional ]
+ 0x7000 SPU 7 [optional ]
+name:SPU_Trigger_cycles_or_edges type:bitmask default:0x0107
+ 0x0000 Count edges [optional ]
+ 0x0001 Count cycles [default ]
+ 0x0000 Negative polarity [optional ]
+ 0x0002 Positive polarity [default ]
+ 0x0104 SPU Trigger 0 [default ]
+ 0x0114 SPU Trigger 1 [optional ]
+ 0x0124 SPU Trigger 2 [optional ]
+ 0x0134 SPU Trigger 3 [optional ]
+ 0x0000 SPU 0 [default ]
+ 0x1000 SPU 1 [optional ]
+ 0x2000 SPU 2 [optional ]
+ 0x3000 SPU 3 [optional ]
+ 0x4000 SPU 4 [optional ]
+ 0x5000 SPU 5 [optional ]
+ 0x6000 SPU 6 [optional ]
+ 0x7000 SPU 7 [optional ]
+name:SPU_Event_cycles_or_edges type:bitmask default:0x0147
+ 0x0000 Count edges [optional ]
+ 0x0001 Count cycles [default ]
+ 0x0000 Negative polarity [optional ]
+ 0x0002 Positive polarity [default ]
+ 0x0144 SPU Event 0 [default ]
+ 0x0154 SPU Event 1 [optional ]
+ 0x0164 SPU Event 2 [optional ]
+ 0x0174 SPU Event 3 [optional ]
+ 0x0000 SPU 0 [default ]
+ 0x1000 SPU 1 [optional ]
+ 0x2000 SPU 2 [optional ]
+ 0x3000 SPU 3 [optional ]
+ 0x4000 SPU 4 [optional ]
+ 0x5000 SPU 5 [optional ]
+ 0x6000 SPU 6 [optional ]
+ 0x7000 SPU 7 [optional ]
Index: oprofile-cvs/ChangeLog
===================================================================
--- oprofile-cvs.orig/ChangeLog
+++ oprofile-cvs/ChangeLog
@@ -1,3 +1,12 @@
+2008-11-17 Carl Love <carll at us.ibm.com
+
+ * Added IBM CELL SPU event profiling support.
+ * utils/opcontrol - rewrote Cell tests to validate which
+ events can be selected at the same time.
+ * events/ppc64/cell-be/events - add CELL SPU events
+ * events/ppc64/cell-be/unit_masks - added CELL SPU
+ unit masks
+
2008-11-24 Robert Richter <robert.richter at amd.com>
* utils/opcontrol: Correct spelling error
Index: oprofile-cvs/utils/opcontrol
===================================================================
--- oprofile-cvs.orig/utils/opcontrol
+++ oprofile-cvs/utils/opcontrol
@@ -1154,31 +1154,67 @@ check_event_mapping_data()
fi
if [ "$CPUTYPE" = "ppc64/cell-be" ]; then
event_num=`echo $EVENT_STR | awk '{print $1}'`
- if [ "$event_num" = "2" ] ; then
- if [ "$CYCLES" = "1" \
- -o "$GRP_NUM_CK_VAL" != "" ] ; then
- echo "ERROR: SPU CYCLES cannot be counted with any other events." >&2
- exit 1
- else
- SPU_CYCLES=2
- return
- fi
- fi
- if [ "$event_num" = "1" ] ; then
- # CYCLES is compatible with any event except SPU_CYCLES
- if [ "$SPU_CYCLES" = "2" ] ; then
- echo "ERROR: PPU CYCLES and SPU CYCLES cannot be counted simultaneously." >&2
- exit 1
- else
- CYCLES=1
- return
- fi
+
+ # PPU event and cycle events can be measured at
+ # the same time. SPU event can not be measured
+ # at the same time as any other event. Similarly for
+ # SPU Cycles
+
+ # We use EVNT_MSK to track what events have already
+ # been seen. Valid values are:
+ # NULL string - no events seen yet
+ # 1 - PPU CYCLES or PPU Event seen
+ # 2 - SPU CYCLES seen
+ # 3 - SPU EVENT seen
+
+ # check if event is PPU_CYCLES
+ if [ "$event_num" = "1" ]; then
+ if [ "$EVNT_MSK" = "1" ] || [ "$EVNT_MSK" = "" ]; then
+ EVNT_MSK=1
+ else
+ echo "PPU CYCLES not compatible with previously specified event"
+ exit 1
+ fi
+
+ # check if event is SPU_CYCLES
+ elif [ "$event_num" = "2" ]; then
+ if [ "$EVNT_MSK" = "" ]; then
+ EVNT_MSK=2
+ else
+ echo "SPU CYCLES not compatible with any other event"
+ exit 1
+ fi
+
+ # check if event is SPU Event profiling
+ elif [ "$event_num" -ge "4100" ] && [ "$event_num" -le "4163" ] ; then
+ if [ "$EVNT_MSK" = "" ]; then
+ EVNT_MSK=3
+ else
+ echo "SPU event profiling not compatible with any other event"
+ exit 1
+ fi
+
+ # Check to see that the kernel supports SPU event profiling
+ # Note, if the file exits it should have the LSB bit set to
+ # to 1 indicating SPU event profiling support. For now, it
+ # is sufficient to test that the file exists.
+ if test ! -f /dev/oprofile/cell_support; then
+ echo "Kernel does not support SPU event profiling"
+ exit 1
+ fi
+
+ # check if event is PPU Event profiling (all other events
+ # are PPU events)
+
else
- if [ "$SPU_CYCLES" = "2" ] ; then
- echo "ERROR: SPU CYCLES cannot be counted with any other events." >&2
+ if [ "$EVNT_MSK" = "1" ] || [ "$EVNT_MSK" = "" ]; then
+ EVNT_MSK=1
+ else
+ echo "PPU profiling not compatible with previously specified event"
exit 1
- fi
+ fi
fi
+
len=`echo -n $event_num | wc -m`
num_chars_in_grpid=`expr $len - 2`
GRP_NUM_VAL=`echo | awk '{print substr("'"${event_num}"'",1,"'"${num_chars_in_grpid}"'")}'`
Index: oprofile-cvs/doc/oprofile.xml
===================================================================
--- oprofile-cvs.orig/doc/oprofile.xml
+++ oprofile-cvs/doc/oprofile.xml
@@ -123,6 +123,10 @@ For information on how to use OProfile's
of 2.6.22 or more recent. Additionally, full support of SPE profiling requires a BFD library
from binutils code dated January 2007 or later. To ensure the proper BFD support exists, run
the <code>configure</code> utility with <code>--with-target=cell-be</code>.
+
+ Profiling the Cell Broadband Engine using SPU events requires a kernel version of 2.6.TBD or
+ more recent.
+
<note>Attempting to profile SPEs with kernel versions older than 2.6.22 may cause the
system to crash.</note>
</para></listitem>
@@ -1195,6 +1199,12 @@ is collected in the sample data in order
the performance of each separate SPU is not necessary.
</para>
<para>
+Profiling with an SPU event (events 4100 through 4163) is not compatible with any other
+event. Further more, only one SPU event can be specified at a time. The hardware only
+supports profiling on one SPU per node at a time. The OProfile kernel code time slices
+between the eight SPUs to collect data on all SPUs.
+</para>
+<para>
SPU profile reports have some unique characteristics compared to reports for
standard architectures:
</para>
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