RISC-V: perf/kvm: Add reporting of interrupt events

For `perf kvm stat` on the RISC-V, in order to avoid the
occurrence of `UNKNOWN` event names, interrupts should be
reported in addition to exceptions.

testing without patch:

Event name                    Samples  Sample%       Time(ns)
---------------------------  --------  --------  ------------
STORE_GUEST_PAGE_FAULT        1496461   53.00%    889612544
UNKNOWN                        887514   31.00%    272857968
LOAD_GUEST_PAGE_FAULT          305164   10.00%    189186331
VIRTUAL_INST_FAULT              70625    2.00%    134114260
SUPERVISOR_SYSCALL              32014    1.00%     58577110
INST_GUEST_PAGE_FAULT               1    0.00%         2545

testing with patch:

Event name                    Samples  Sample%       Time(ns)
---------------------------  --------  --------  ------------
IRQ_S_TIMER                   211271    58.00%  738298680600
EXC_STORE_GUEST_PAGE_FAULT    111279    30.00%  130725914800
EXC_LOAD_GUEST_PAGE_FAULT      22039     6.00%   25441480600
EXC_VIRTUAL_INST_FAULT          8913     2.00%   21015381600
IRQ_VS_EXT                      4748     1.00%   10155464300
IRQ_S_EXT                       2802     0.00%   13288775800
IRQ_S_SOFT                      1998     0.00%    4254129300

Signed-off-by: Quan Zhou <zhouquan@iscas.ac.cn>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Link: https://lore.kernel.org/r/9693132df4d0f857b8be3a75750c36b40213fcc0.1726211632.git.zhouquan@iscas.ac.cn
Signed-off-by: Anup Patel <anup@brainfault.org>

Author: zcxGGmu

tools/perf/arch/riscv/util/kvm-stat.c

@@ -9,10 +9,10 @@
 #include <memory.h>
 #include "../../../util/evsel.h"
 #include "../../../util/kvm-stat.h"
-#include "riscv_exception_types.h"
+#include "riscv_trap_types.h"
 #include "debug.h"
 
-define_exit_reasons_table(riscv_exit_reasons, kvm_riscv_exception_class);
+define_exit_reasons_table(riscv_exit_reasons, kvm_riscv_trap_class);
 
 const char *vcpu_id_str = "id";
 const char *kvm_exit_reason = "scause";
@@ -30,7 +30,7 @@ static void event_get_key(struct evsel *evsel,
 			  struct event_key *key)
 {
 	key->info = 0;
-	key->key = evsel__intval(evsel, sample, kvm_exit_reason);
+	key->key = evsel__intval(evsel, sample, kvm_exit_reason) & ~CAUSE_IRQ_FLAG;
 	key->exit_reasons = riscv_exit_reasons;
 }
 

tools/perf/arch/riscv/util/riscv_exception_types.h

@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0
+#ifndef ARCH_PERF_RISCV_TRAP_TYPES_H
+#define ARCH_PERF_RISCV_TRAP_TYPES_H
+
+/* Exception cause high bit - is an interrupt if set */
+#define CAUSE_IRQ_FLAG		(_AC(1, UL) << (__riscv_xlen - 1))
+
+/* Interrupt causes (minus the high bit) */
+#define IRQ_S_SOFT 1
+#define IRQ_VS_SOFT 2
+#define IRQ_M_SOFT 3
+#define IRQ_S_TIMER 5
+#define IRQ_VS_TIMER 6
+#define IRQ_M_TIMER 7
+#define IRQ_S_EXT 9
+#define IRQ_VS_EXT 10
+#define IRQ_M_EXT 11
+#define IRQ_S_GEXT 12
+#define IRQ_PMU_OVF 13
+
+/* Exception causes */
+#define EXC_INST_MISALIGNED 0
+#define EXC_INST_ACCESS 1
+#define EXC_INST_ILLEGAL 2
+#define EXC_BREAKPOINT 3
+#define EXC_LOAD_MISALIGNED 4
+#define EXC_LOAD_ACCESS 5
+#define EXC_STORE_MISALIGNED 6
+#define EXC_STORE_ACCESS 7
+#define EXC_SYSCALL 8
+#define EXC_HYPERVISOR_SYSCALL 9
+#define EXC_SUPERVISOR_SYSCALL 10
+#define EXC_INST_PAGE_FAULT 12
+#define EXC_LOAD_PAGE_FAULT 13
+#define EXC_STORE_PAGE_FAULT 15
+#define EXC_INST_GUEST_PAGE_FAULT 20
+#define EXC_LOAD_GUEST_PAGE_FAULT 21
+#define EXC_VIRTUAL_INST_FAULT 22
+#define EXC_STORE_GUEST_PAGE_FAULT 23
+
+#define TRAP(x) { x, #x }
+
+#define kvm_riscv_trap_class \
+	TRAP(IRQ_S_SOFT), TRAP(IRQ_VS_SOFT), TRAP(IRQ_M_SOFT), \
+	TRAP(IRQ_S_TIMER), TRAP(IRQ_VS_TIMER), TRAP(IRQ_M_TIMER), \
+	TRAP(IRQ_S_EXT), TRAP(IRQ_VS_EXT), TRAP(IRQ_M_EXT), \
+	TRAP(IRQ_S_GEXT), TRAP(IRQ_PMU_OVF), \
+	TRAP(EXC_INST_MISALIGNED), TRAP(EXC_INST_ACCESS), TRAP(EXC_INST_ILLEGAL), \
+	TRAP(EXC_BREAKPOINT), TRAP(EXC_LOAD_MISALIGNED), TRAP(EXC_LOAD_ACCESS), \
+	TRAP(EXC_STORE_MISALIGNED), TRAP(EXC_STORE_ACCESS), TRAP(EXC_SYSCALL), \
+	TRAP(EXC_HYPERVISOR_SYSCALL), TRAP(EXC_SUPERVISOR_SYSCALL), \
+	TRAP(EXC_INST_PAGE_FAULT), TRAP(EXC_LOAD_PAGE_FAULT), \
+	TRAP(EXC_STORE_PAGE_FAULT), TRAP(EXC_INST_GUEST_PAGE_FAULT), \
+	TRAP(EXC_LOAD_GUEST_PAGE_FAULT), TRAP(EXC_VIRTUAL_INST_FAULT), \
+	TRAP(EXC_STORE_GUEST_PAGE_FAULT)
+
+#endif /* ARCH_PERF_RISCV_TRAP_TYPES_H */