On 12/06/2024 07.23, Nicholas Piggin wrote:
Add some initial PMU testing.
- PMC5/6 tests
- PMAE / PMI test
- BHRB basic tests
Signed-off-by: Nicholas Piggin <npiggin@xxxxxxxxx>
---
...
diff --git a/powerpc/pmu.c b/powerpc/pmu.c
new file mode 100644
index 000000000..bdc45e167
--- /dev/null
+++ b/powerpc/pmu.c
@@ -0,0 +1,562 @@
...
+static void test_pmc5_with_ldat(void)
+{
+ unsigned long pmc5_1, pmc5_2;
+ register unsigned long r4 asm("r4");
+ register unsigned long r5 asm("r5");
+ register unsigned long r6 asm("r6");
+ uint64_t val;
+
+ reset_mmcr0();
+ mtspr(SPR_PMC5, 0);
+ mtspr(SPR_MMCR0, mfspr(SPR_MMCR0) & ~(MMCR0_FC | MMCR0_FC56));
+ asm volatile(".rep 20 ; nop ; .endr" ::: "memory");
+ mtspr(SPR_MMCR0, mfspr(SPR_MMCR0) | (MMCR0_FC | MMCR0_FC56));
+ pmc5_1 = mfspr(SPR_PMC5);
+
+ val = 0xdeadbeef;
+ r4 = 0;
+ r5 = 0xdeadbeef;
+ r6 = 100;
+ reset_mmcr0();
+ mtspr(SPR_PMC5, 0);
+ mtspr(SPR_MMCR0, mfspr(SPR_MMCR0) & ~(MMCR0_FC | MMCR0_FC56));
+ asm volatile(".rep 10 ; nop ; .endr ; ldat %0,%3,0x10 ; .rep 10 ; nop ; .endr" : "=r"(r4), "+r"(r5), "+r"(r6) : "r"(&val) :"memory");
Looks like older versions of Clang do not like this instruction:
/tmp/pmu-4fda98.s: Assembler messages:
/tmp/pmu-4fda98.s:1685: Error: unrecognized opcode: `ldat'
clang-13: error: assembler command failed with exit code 1 (use -v to see
invocation)
Could you please work-around that issue?
Also, please break the very long line here. Thanks!
+ mtspr(SPR_MMCR0, mfspr(SPR_MMCR0) | (MMCR0_FC | MMCR0_FC56));
+ pmc5_2 = mfspr(SPR_PMC5);
+ assert(r4 == 0xdeadbeef);
+ assert(val == 0xdeadbeef);
+
+ /* TCG does not count instructions around syscalls correctly */
+ report_kfail(host_is_tcg, pmc5_1 != pmc5_2 + 1,
+ "PMC5 counts instructions with ldat");
+}
Thomas
