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Date: Tue, 31 May 2022 10:11:37 +1000
From: Alistair Francis <alistair23@...il.com>
To: Atish Patra <atishp@...osinc.com>
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Alistair Francis <alistair.francis@....com>,
Bin Meng <bin.meng@...driver.com>,
Palmer Dabbelt <palmer@...belt.com>,
"qemu-devel@...gnu.org Developers" <qemu-devel@...gnu.org>,
"open list:RISC-V" <qemu-riscv@...gnu.org>
Subject: Re: [PATCH v9 11/12] hw/riscv: virt: Add PMU DT node to the device tree
On Tue, May 24, 2022 at 10:10 AM Atish Patra <atishp@...osinc.com> wrote:
>
> 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.patra@....com>
> Signed-off-by: Atish Patra <atishp@...osinc.com>
Acked-by: Alistair Francis <alistair.francis@....com>
Alistair
> ---
> 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
>
>
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