Qemu virt machine can support few cache events and cycle/instret counters.
It also supports counter overflow for these events.
Add a DT node so that OpenSBI/Linux kernel is aware of the virt machine
capabilities. There are some dummy nodes added for testing as well.
Signed-off-by: Atish Patra <atish.pa...@wdc.com>
Signed-off-by: Atish Patra <ati...@rivosinc.com>
---
hw/riscv/virt.c | 28 +++++++++++++++++++++++
target/riscv/cpu.c | 1 +
target/riscv/pmu.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++
target/riscv/pmu.h | 1 +
4 files changed, 87 insertions(+)
diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c
index 3326f4db96a2..1b17ba7f8059 100644
--- a/hw/riscv/virt.c
+++ b/hw/riscv/virt.c
@@ -29,6 +29,7 @@
#include "hw/char/serial.h"
#include "target/riscv/cpu.h"
#include "hw/core/sysbus-fdt.h"
+#include "target/riscv/pmu.h"
#include "hw/riscv/riscv_hart.h"
#include "hw/riscv/virt.h"
#include "hw/riscv/boot.h"
@@ -715,6 +716,32 @@ static void create_fdt_socket_aplic(RISCVVirtState *s,
aplic_phandles[socket] = aplic_s_phandle;
}
+static void create_fdt_socket_pmu(RISCVVirtState *s,
+ int socket, uint32_t *phandle,
+ uint32_t *intc_phandles)
+{
+ int cpu;
+ char *pmu_name;
+ uint32_t *pmu_cells;
+ MachineState *mc = MACHINE(s);
+ RISCVCPU hart = s->soc[socket].harts[0];
+
+ pmu_cells = g_new0(uint32_t, s->soc[socket].num_harts * 2);
+
+ for (cpu = 0; cpu < s->soc[socket].num_harts; cpu++) {
+ pmu_cells[cpu * 2 + 0] = cpu_to_be32(intc_phandles[cpu]);
+ pmu_cells[cpu * 2 + 1] = cpu_to_be32(IRQ_PMU_OVF);
+ }
+
+ pmu_name = g_strdup_printf("/soc/pmu");
+ qemu_fdt_add_subnode(mc->fdt, pmu_name);
+ qemu_fdt_setprop_string(mc->fdt, pmu_name, "compatible", "riscv,pmu");
+ riscv_pmu_generate_fdt_node(mc->fdt, hart.cfg.pmu_num, pmu_name);
+
+ g_free(pmu_name);
+ g_free(pmu_cells);
+}
+
static void create_fdt_sockets(RISCVVirtState *s, const MemMapEntry *memmap,
bool is_32_bit, uint32_t *phandle,
uint32_t *irq_mmio_phandle,
@@ -760,6 +787,7 @@ static void create_fdt_sockets(RISCVVirtState *s, const
MemMapEntry *memmap,
&intc_phandles[phandle_pos]);
}
}
+ create_fdt_socket_pmu(s, socket, phandle, intc_phandles);
}
if (s->aia_type == VIRT_AIA_TYPE_APLIC_IMSIC) {
diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index a8f156a66eba..b51ad7496f71 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -1032,6 +1032,7 @@ static void riscv_isa_string_ext(RISCVCPU *cpu, char
**isa_str, int max_str_len)
ISA_EDATA_ENTRY(zkt, ext_zkt),
ISA_EDATA_ENTRY(zve32f, ext_zve32f),
ISA_EDATA_ENTRY(zve64f, ext_zve64f),
+ ISA_EDATA_ENTRY(sscofpmf, ext_sscofpmf),
ISA_EDATA_ENTRY(svinval, ext_svinval),
ISA_EDATA_ENTRY(svnapot, ext_svnapot),
ISA_EDATA_ENTRY(svpbmt, ext_svpbmt),
diff --git a/target/riscv/pmu.c b/target/riscv/pmu.c
index 7bb85d8d6ad7..0163758297c4 100644
--- a/target/riscv/pmu.c
+++ b/target/riscv/pmu.c
@@ -20,11 +20,68 @@
#include "cpu.h"
#include "pmu.h"
#include "sysemu/cpu-timers.h"
+#include "sysemu/device_tree.h"
#define RISCV_TIMEBASE_FREQ 1000000000 /* 1Ghz */
#define MAKE_32BIT_MASK(shift, length) \
(((uint32_t)(~0UL) >> (32 - (length))) << (shift))
+/**
+ * To keep it simple, any event can be mapped to any programmable counters in
+ * QEMU. The generic cycle & instruction count events can also be monitored
+ * using programmable counters. In that case, mcycle & minstret must continue
+ * to provide the correct value as well. Heterogeneous PMU per hart is not
+ * supported yet. Thus, number of counters are same across all harts.
+ */
+void riscv_pmu_generate_fdt_node(void *fdt, int num_ctrs, char *pmu_name)
+{
+ uint32_t fdt_event_ctr_map[20] = {};
+ uint32_t cmask;
+
+ /* All the programmable counters can map to any event */
+ cmask = MAKE_32BIT_MASK(3, num_ctrs);
+
+ /**
+ * The event encoding is specified in the SBI specification
+ * Event idx is a 20bits wide number encoded as follows:
+ * event_idx[19:16] = type
+ * event_idx[15:0] = code
+ * The code field in cache events are encoded as follows:
+ * event_idx.code[15:3] = cache_id
+ * event_idx.code[2:1] = op_id
+ * event_idx.code[0:0] = result_id
+ */
+
+ /* SBI_PMU_HW_CPU_CYCLES: 0x01 : type(0x00) */
+ fdt_event_ctr_map[0] = cpu_to_be32(0x00000001);
+ fdt_event_ctr_map[1] = cpu_to_be32(0x00000001);
+ fdt_event_ctr_map[2] = cpu_to_be32(cmask | 1 << 0);
+
+ /* SBI_PMU_HW_INSTRUCTIONS: 0x02 : type(0x00) */
+ fdt_event_ctr_map[3] = cpu_to_be32(0x00000002);
+ fdt_event_ctr_map[4] = cpu_to_be32(0x00000002);
+ fdt_event_ctr_map[5] = cpu_to_be32(cmask | 1 << 2);
+
+ /* SBI_PMU_HW_CACHE_DTLB : 0x03 READ : 0x00 MISS : 0x00 type(0x01) */
+ fdt_event_ctr_map[6] = cpu_to_be32(0x00010019);
+ fdt_event_ctr_map[7] = cpu_to_be32(0x00010019);
+ fdt_event_ctr_map[8] = cpu_to_be32(cmask);
+
+ /* SBI_PMU_HW_CACHE_DTLB : 0x03 WRITE : 0x01 MISS : 0x00 type(0x01) */
+ fdt_event_ctr_map[9] = cpu_to_be32(0x0001001B);
+ fdt_event_ctr_map[10] = cpu_to_be32(0x0001001B);
+ fdt_event_ctr_map[11] = cpu_to_be32(cmask);
+
+ /* SBI_PMU_HW_CACHE_ITLB : 0x04 READ : 0x00 MISS : 0x00 type(0x01) */
+ fdt_event_ctr_map[12] = cpu_to_be32(0x00010021);
+ fdt_event_ctr_map[13] = cpu_to_be32(0x00010021);
+ fdt_event_ctr_map[14] = cpu_to_be32(cmask);
+
+ /* This a OpenSBI specific DT property documented in OpenSBI docs */
+ qemu_fdt_setprop(fdt, pmu_name, "riscv,event-to-mhpmcounters",
+ fdt_event_ctr_map, sizeof(fdt_event_ctr_map));
+}
+
static bool riscv_pmu_counter_valid(RISCVCPU *cpu, uint32_t ctr_idx)
{
if (ctr_idx < 3 || ctr_idx >= RV_MAX_MHPMCOUNTERS ||
diff --git a/target/riscv/pmu.h b/target/riscv/pmu.h
index 036653627f78..3004ce37b636 100644
--- a/target/riscv/pmu.h
+++ b/target/riscv/pmu.h
@@ -31,5 +31,6 @@ int riscv_pmu_init(RISCVCPU *cpu, int num_counters);
int riscv_pmu_update_event_map(CPURISCVState *env, uint64_t value,
uint32_t ctr_idx);
int riscv_pmu_incr_ctr(RISCVCPU *cpu, enum riscv_pmu_event_idx event_idx);
+void riscv_pmu_generate_fdt_node(void *fdt, int num_counters, char *pmu_name);
int riscv_pmu_setup_timer(CPURISCVState *env, uint64_t value,
uint32_t ctr_idx);
--
2.25.1
