perf bpf filter: Add data_src sample data support

The data_src has many entries to express memory behaviors. Add each
term separately so that users can combine them for their purpose.

I didn't add prefix for the constants for simplicity as they are mostly
distinguishable but I had to use l1_miss and l2_hit for mem_dtlb since
mem_lvl has different values for the same names. Note that I decided
mem_lvl to be used as an alias of mem_lvlnum as it's deprecated now.
According to the comment in the UAPI header, users should use the mix of
mem_lvlnum, mem_remote and mem_snoop. Also the SNOOPX bits are
concatenated to mem_snoop for simplicity.

The following terms are used for data_src and the corresponding perf
sample data fields:

* mem_op : { load, store, pfetch, exec }
* mem_lvl: { l1, l2, l3, l4, cxl, io, any_cache, lfb, ram, pmem }
* mem_snoop: { none, hit, miss, hitm, fwd, peer }
* mem_remote: { remote }
* mem_lock: { locked }
* mem_dtlb { l1_hit, l1_miss, l2_hit, l2_miss, any_hit, any_miss, walk, fault }
* mem_blk { by_data, by_addr }
* mem_hops { hops0, hops1, hops2, hops3 }

We can now use a filter expression like below:

'mem_op == load, mem_lvl <= l2, mem_dtlb == l1_hit'
'mem_dtlb == l2_miss, mem_hops > hops1'
'mem_lvl == ram, mem_remote == 1'

Note that 'na' is shared among the terms as it has the same value except
for mem_lvl. I don't have a good idea to handle that for now.

Signed-off-by: Namhyung Kim <[e-mail]>
Acked-by: Jiri Olsa <[e-mail]>
Cc: Adrian Hunter <[e-mail]>
Cc: Andi Kleen <[e-mail]>
Cc: Hao Luo <[e-mail]>
Cc: Ian Rogers <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: James Clark <[e-mail]>
Cc: Kan Liang <[e-mail]>
Cc: Leo Yan <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Ravi Bangoria <[e-mail]>
Cc: Song Liu <[e-mail]>
Cc: Stephane Eranian <[e-mail]>
Cc: [e-mail]
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/util/bpf-filter.l

···
 	return BFT_NUM;
 }
 
+static int constant(int val)
+{
+	perf_bpf_filter_lval.num = val;
+	return BFT_NUM;
+}
+
 static int error(const char *str)
 {
 	printf("perf_bpf_filter: Unexpected filter %s: %s\n", str, perf_bpf_filter_text);
···
 phys_addr	{ return sample(PERF_SAMPLE_PHYS_ADDR); }
 code_pgsz	{ return sample(PERF_SAMPLE_CODE_PAGE_SIZE); }
 data_pgsz	{ return sample(PERF_SAMPLE_DATA_PAGE_SIZE); }
+mem_op		{ return sample_part(PERF_SAMPLE_DATA_SRC, 1); }
+mem_lvlnum	{ return sample_part(PERF_SAMPLE_DATA_SRC, 2); }
+mem_lvl		{ return sample_part(PERF_SAMPLE_DATA_SRC, 2); } /* alias for mem_lvlnum */
+mem_snoop	{ return sample_part(PERF_SAMPLE_DATA_SRC, 3); } /* include snoopx */
+mem_remote	{ return sample_part(PERF_SAMPLE_DATA_SRC, 4); }
+mem_lock	{ return sample_part(PERF_SAMPLE_DATA_SRC, 5); }
+mem_dtlb	{ return sample_part(PERF_SAMPLE_DATA_SRC, 6); }
+mem_blk		{ return sample_part(PERF_SAMPLE_DATA_SRC, 7); }
+mem_hops	{ return sample_part(PERF_SAMPLE_DATA_SRC, 8); }
 
 "=="		{ return operator(PBF_OP_EQ); }
 "!="		{ return operator(PBF_OP_NEQ); }
···
 ">="		{ return operator(PBF_OP_GE); }
 "<="		{ return operator(PBF_OP_LE); }
 "&"		{ return operator(PBF_OP_AND); }
+
+na		{ return constant(PERF_MEM_OP_NA); }
+load		{ return constant(PERF_MEM_OP_LOAD); }
+store		{ return constant(PERF_MEM_OP_STORE); }
+pfetch		{ return constant(PERF_MEM_OP_PFETCH); }
+exec		{ return constant(PERF_MEM_OP_EXEC); }
+
+l1		{ return constant(PERF_MEM_LVLNUM_L1); }
+l2		{ return constant(PERF_MEM_LVLNUM_L2); }
+l3		{ return constant(PERF_MEM_LVLNUM_L3); }
+l4		{ return constant(PERF_MEM_LVLNUM_L4); }
+cxl		{ return constant(PERF_MEM_LVLNUM_CXL); }
+io		{ return constant(PERF_MEM_LVLNUM_IO); }
+any_cache	{ return constant(PERF_MEM_LVLNUM_ANY_CACHE); }
+lfb		{ return constant(PERF_MEM_LVLNUM_LFB); }
+ram		{ return constant(PERF_MEM_LVLNUM_RAM); }
+pmem		{ return constant(PERF_MEM_LVLNUM_PMEM); }
+
+none		{ return constant(PERF_MEM_SNOOP_NONE); }
+hit		{ return constant(PERF_MEM_SNOOP_HIT); }
+miss		{ return constant(PERF_MEM_SNOOP_MISS); }
+hitm		{ return constant(PERF_MEM_SNOOP_HITM); }
+fwd		{ return constant(PERF_MEM_SNOOPX_FWD); }
+peer		{ return constant(PERF_MEM_SNOOPX_PEER); }
+
+remote		{ return constant(PERF_MEM_REMOTE_REMOTE); }
+
+locked		{ return constant(PERF_MEM_LOCK_LOCKED); }
+
+l1_hit		{ return constant(PERF_MEM_TLB_L1 | PERF_MEM_TLB_HIT); }
+l1_miss		{ return constant(PERF_MEM_TLB_L1 | PERF_MEM_TLB_MISS); }
+l2_hit		{ return constant(PERF_MEM_TLB_L2 | PERF_MEM_TLB_HIT); }
+l2_miss		{ return constant(PERF_MEM_TLB_L2 | PERF_MEM_TLB_MISS); }
+any_hit		{ return constant(PERF_MEM_TLB_HIT); }
+any_miss	{ return constant(PERF_MEM_TLB_MISS); }
+walk		{ return constant(PERF_MEM_TLB_WK); }
+os		{ return constant(PERF_MEM_TLB_OS); }
+fault		{ return constant(PERF_MEM_TLB_OS); } /* alias for os */
+
+by_data		{ return constant(PERF_MEM_BLK_DATA); }
+by_addr		{ return constant(PERF_MEM_BLK_ADDR); }
+
+hops0		{ return constant(PERF_MEM_HOPS_0); }
+hops1		{ return constant(PERF_MEM_HOPS_1); }
+hops2		{ return constant(PERF_MEM_HOPS_2); }
+hops3		{ return constant(PERF_MEM_HOPS_3); }
 
 ","		{ return ','; }
 

tools/perf/util/bpf_skel/sample_filter.bpf.c

···
 		return kctx->data->code_page_size;
 	case PERF_SAMPLE_DATA_PAGE_SIZE:
 		return kctx->data->data_page_size;
+	case PERF_SAMPLE_DATA_SRC:
+		if (entry->part == 1)
+			return kctx->data->data_src.mem_op;
+		if (entry->part == 2)
+			return kctx->data->data_src.mem_lvl_num;
+		if (entry->part == 3) {
+			__u32 snoop = kctx->data->data_src.mem_snoop;
+			__u32 snoopx = kctx->data->data_src.mem_snoopx;
+
+			return (snoopx << 5) | snoop;
+		}
+		if (entry->part == 4)
+			return kctx->data->data_src.mem_remote;
+		if (entry->part == 5)
+			return kctx->data->data_src.mem_lock;
+		if (entry->part == 6)
+			return kctx->data->data_src.mem_dtlb;
+		if (entry->part == 7)
+			return kctx->data->data_src.mem_blk;
+		if (entry->part == 8)
+			return kctx->data->data_src.mem_hops;
+		/* return the whole word */
+		return kctx->data->data_src.val;
 	default:
 		break;
 	}