[PATCH 10/16] lib: utils/hsm: Add RPMI HSM driver
Anup Patel
apatel at ventanamicro.com
Tue Aug 6 00:33:32 PDT 2024
From: Subrahmanya Lingappa <slingappa at ventanamicro.com>
The RPMI HSM service group provides set of routine to query and control
power states of a Hart. Add RPMI based Hart State Management (HSM) driver.
Signed-off-by: Subrahmanya Lingappa <slingappa at ventanamicro.com>
Signed-off-by: Anup Patel <apatel at ventanamicro.com>
---
include/sbi_utils/mailbox/rpmi_msgprot.h | 91 ++++++
lib/utils/hsm/Kconfig | 9 +
lib/utils/hsm/fdt_hsm_rpmi.c | 351 +++++++++++++++++++++++
lib/utils/hsm/objects.mk | 3 +
platform/generic/configs/defconfig | 1 +
5 files changed, 455 insertions(+)
create mode 100644 lib/utils/hsm/fdt_hsm_rpmi.c
diff --git a/include/sbi_utils/mailbox/rpmi_msgprot.h b/include/sbi_utils/mailbox/rpmi_msgprot.h
index a2403c90..efe35aee 100644
--- a/include/sbi_utils/mailbox/rpmi_msgprot.h
+++ b/include/sbi_utils/mailbox/rpmi_msgprot.h
@@ -151,6 +151,7 @@ enum rpmi_servicegroup_id {
RPMI_SRVGRP_BASE = 0x00001,
RPMI_SRVGRP_SYSTEM_RESET = 0x00002,
RPMI_SRVGRP_SYSTEM_SUSPEND = 0x00003,
+ RPMI_SRVGRP_HSM = 0x00004,
RPMI_SRVGRP_ID_MAX_COUNT,
};
@@ -243,4 +244,94 @@ struct rpmi_syssusp_suspend_resp {
s32 status;
};
+/** RPMI HSM State Management ServiceGroup Service IDs */
+enum rpmi_cpu_hsm_service_id {
+ RPMI_HSM_SRV_ENABLE_NOTIFICATION = 0x01,
+ RPMI_HSM_SRV_HART_START = 0x02,
+ RPMI_HSM_SRV_HART_STOP = 0x03,
+ RPMI_HSM_SRV_HART_SUSPEND = 0x04,
+ RPMI_HSM_SRV_GET_HART_STATUS = 0x05,
+ RPMI_HSM_SRV_GET_HART_LIST = 0x06,
+ RPMI_HSM_SRV_GET_SUSPEND_TYPES = 0x07,
+ RPMI_HSM_SRV_GET_SUSPEND_INFO = 0x08,
+ RPMI_HSM_SRV_ID_MAX_COUNT,
+};
+
+/* HSM service group request and response structs */
+struct rpmi_hsm_hart_start_req {
+ u32 hartid;
+ u32 start_addr_lo;
+ u32 start_addr_hi;
+};
+
+struct rpmi_hsm_hart_start_resp {
+ s32 status;
+};
+
+struct rpmi_hsm_hart_stop_req {
+ u32 hartid;
+};
+
+struct rpmi_hsm_hart_stop_resp {
+ s32 status;
+};
+
+struct rpmi_hsm_hart_susp_req {
+ u32 hartid;
+ u32 suspend_type;
+ u32 resume_addr_lo;
+ u32 resume_addr_hi;
+};
+
+struct rpmi_hsm_hart_susp_resp {
+ s32 status;
+};
+
+struct rpmi_hsm_get_hart_status_req {
+ u32 hartid;
+};
+
+struct rpmi_hsm_get_hart_status_resp {
+ s32 status;
+ u32 hart_status;
+};
+
+struct rpmi_hsm_get_hart_list_req {
+ u32 start_index;
+};
+
+struct rpmi_hsm_get_hart_list_resp {
+ s32 status;
+ u32 remaining;
+ u32 returned;
+ /* remaining space need to be adjusted for the above 3 u32's */
+ u32 hartid[(RPMI_MSG_DATA_SIZE(RPMI_SLOT_SIZE_MIN) - (sizeof(u32) * 3)) / sizeof(u32)];
+};
+
+struct rpmi_hsm_get_susp_types_req {
+ u32 start_index;
+};
+
+struct rpmi_hsm_get_susp_types_resp {
+ s32 status;
+ u32 remaining;
+ u32 returned;
+ /* remaining space need to be adjusted for the above 3 u32's */
+ u32 types[(RPMI_MSG_DATA_SIZE(RPMI_SLOT_SIZE_MIN) - (sizeof(u32) * 3)) / sizeof(u32)];
+};
+
+struct rpmi_hsm_get_susp_info_req {
+ u32 suspend_type;
+};
+
+struct rpmi_hsm_get_susp_info_resp {
+ s32 status;
+ u32 flags;
+#define RPMI_HSM_FLAGS_LOCAL_TIME_STOP (1U << 31)
+ u32 entry_latency_us;
+ u32 exit_latency_us;
+ u32 wakeup_latency_us;
+ u32 min_residency_us;
+};
+
#endif /* !__RPMI_MSGPROT_H__ */
diff --git a/lib/utils/hsm/Kconfig b/lib/utils/hsm/Kconfig
index 31506116..1ad7958f 100644
--- a/lib/utils/hsm/Kconfig
+++ b/lib/utils/hsm/Kconfig
@@ -7,4 +7,13 @@ config FDT_HSM
depends on FDT
default n
+if FDT_HSM
+
+config FDT_HSM_RPMI
+ bool "FDT RPMI HSM driver"
+ depends on FDT_MAILBOX && RPMI_MAILBOX
+ default n
+
+endif
+
endmenu
diff --git a/lib/utils/hsm/fdt_hsm_rpmi.c b/lib/utils/hsm/fdt_hsm_rpmi.c
new file mode 100644
index 00000000..e598901d
--- /dev/null
+++ b/lib/utils/hsm/fdt_hsm_rpmi.c
@@ -0,0 +1,351 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2024 Ventana Micro Systems Inc.
+ *
+ * Authors:
+ * Subrahmanya Lingappa <slingappa at ventanamicro.com>
+ */
+
+#include <libfdt.h>
+#include <sbi/sbi_console.h>
+#include <sbi/sbi_heap.h>
+#include <sbi/sbi_hsm.h>
+#include <sbi/sbi_scratch.h>
+#include <sbi_utils/fdt/fdt_helper.h>
+#include <sbi_utils/fdt/fdt_fixup.h>
+#include <sbi_utils/hsm/fdt_hsm.h>
+#include <sbi_utils/mailbox/fdt_mailbox.h>
+#include <sbi_utils/mailbox/mailbox.h>
+#include <sbi_utils/mailbox/rpmi_mailbox.h>
+
+#define MAX_HSM_SUPSEND_STATE_NAMELEN 16
+
+struct rpmi_hsm_suspend {
+ u32 num_states;
+ struct sbi_cpu_idle_state *states;
+};
+
+struct rpmi_hsm {
+ struct mbox_chan *chan;
+ struct rpmi_hsm_suspend *susp;
+};
+
+static unsigned long rpmi_hsm_offset;
+
+static struct rpmi_hsm *rpmi_hsm_get_pointer(u32 hartid)
+{
+ struct sbi_scratch *scratch;
+
+ scratch = sbi_hartid_to_scratch(hartid);
+ if (!scratch || !rpmi_hsm_offset)
+ return NULL;
+
+ return sbi_scratch_offset_ptr(scratch, rpmi_hsm_offset);
+}
+
+static int rpmi_hsm_start(u32 hartid, ulong resume_addr)
+{
+ struct rpmi_hsm_hart_start_req req;
+ struct rpmi_hsm_hart_start_resp resp;
+ struct rpmi_hsm *rpmi = rpmi_hsm_get_pointer(hartid);
+
+ if (!rpmi)
+ return SBI_ENOSYS;
+
+ req.hartid = hartid;
+ req.start_addr_lo = resume_addr;
+ req.start_addr_hi = (u64)resume_addr >> 32;
+
+ return rpmi_normal_request_with_status(
+ rpmi->chan, RPMI_HSM_SRV_HART_START,
+ &req, rpmi_u32_count(req), rpmi_u32_count(req),
+ &resp, rpmi_u32_count(resp), rpmi_u32_count(resp));
+}
+
+static int rpmi_hsm_stop(void)
+{
+ int rc;
+ struct rpmi_hsm_hart_stop_req req;
+ struct rpmi_hsm_hart_stop_resp resp;
+ void (*jump_warmboot)(void) =
+ (void (*)(void))sbi_scratch_thishart_ptr()->warmboot_addr;
+ struct rpmi_hsm *rpmi = rpmi_hsm_get_pointer(current_hartid());
+
+ if (!rpmi)
+ return SBI_ENOSYS;
+
+ req.hartid = current_hartid();
+
+ rc = rpmi_normal_request_with_status(
+ rpmi->chan, RPMI_HSM_SRV_HART_STOP,
+ &req, rpmi_u32_count(req), rpmi_u32_count(req),
+ &resp, rpmi_u32_count(resp), rpmi_u32_count(resp));
+ if (rc)
+ return rc;
+
+ /* Wait for interrupt */
+ wfi();
+
+ jump_warmboot();
+
+ return 0;
+}
+
+static bool is_rpmi_hsm_susp_supported(struct rpmi_hsm_suspend *susp, u32 type)
+{
+ int i;
+
+ for (i = 0; i < susp->num_states; i++)
+ if (type == susp->states[i].suspend_param)
+ return true;
+
+ return false;
+}
+
+static int rpmi_hsm_suspend(u32 type, ulong resume_addr)
+{
+ int rc;
+ struct rpmi_hsm_hart_susp_req req;
+ struct rpmi_hsm_hart_susp_resp resp;
+ struct rpmi_hsm *rpmi = rpmi_hsm_get_pointer(current_hartid());
+
+ if (!rpmi)
+ return SBI_ENOSYS;
+
+ /* check if harts support this suspend type */
+ if (!is_rpmi_hsm_susp_supported(rpmi->susp, type))
+ return SBI_EINVAL;
+
+ req.hartid = current_hartid();
+ req.suspend_type = type;
+ req.resume_addr_lo = resume_addr;
+ req.resume_addr_hi = (u64)resume_addr >> 32;
+
+ rc = rpmi_normal_request_with_status(
+ rpmi->chan, RPMI_HSM_SRV_HART_SUSPEND,
+ &req, rpmi_u32_count(req), rpmi_u32_count(req),
+ &resp, rpmi_u32_count(resp), rpmi_u32_count(resp));
+ if (rc)
+ return rc;
+
+ /* Wait for interrupt */
+ wfi();
+
+ return 0;
+}
+
+static struct sbi_hsm_device sbi_hsm_rpmi = {
+ .name = "rpmi-hsm",
+ .hart_start = rpmi_hsm_start,
+ .hart_stop = rpmi_hsm_stop,
+ .hart_suspend = rpmi_hsm_suspend,
+};
+
+static int rpmi_hsm_fixup(void *fdt)
+{
+ struct rpmi_hsm *rpmi = rpmi_hsm_get_pointer(current_hartid());
+
+ if (!rpmi || !rpmi->susp || !rpmi->susp->num_states)
+ return 0;
+
+ return fdt_add_cpu_idle_states(fdt, rpmi->susp->states);
+}
+
+static int rpmi_hsm_get_num_suspend_states(struct mbox_chan *chan,
+ struct rpmi_hsm_suspend *susp)
+{
+ int rc;
+ struct rpmi_hsm_get_susp_types_req req;
+ struct rpmi_hsm_get_susp_types_resp resp;
+
+ req.start_index = 0;
+ rc = rpmi_normal_request_with_status(
+ chan, RPMI_HSM_SRV_GET_SUSPEND_TYPES,
+ &req, rpmi_u32_count(req), rpmi_u32_count(req),
+ &resp, rpmi_u32_count(resp), rpmi_u32_count(resp));
+ if (rc)
+ return rc;
+
+ susp->num_states = resp.returned + resp.remaining;
+ return 0;
+}
+
+static int rpmi_hsm_get_suspend_states(struct mbox_chan *chan,
+ struct rpmi_hsm_suspend *susp)
+{
+ int rc, i, cnt = 0;
+ struct rpmi_hsm_get_susp_types_req req;
+ struct rpmi_hsm_get_susp_types_resp resp;
+ struct rpmi_hsm_get_susp_info_req dreq;
+ struct rpmi_hsm_get_susp_info_resp dresp;
+ struct sbi_cpu_idle_state *state;
+
+ if (!susp->num_states)
+ return 0;
+
+ req.start_index = 0;
+ do {
+ rc = rpmi_normal_request_with_status(
+ chan, RPMI_HSM_SRV_GET_SUSPEND_TYPES,
+ &req, rpmi_u32_count(req), rpmi_u32_count(req),
+ &resp, rpmi_u32_count(resp), rpmi_u32_count(resp));
+ if (rc)
+ return rc;
+
+ for (i = 0; i < resp.returned && cnt < susp->num_states; i++)
+ susp->states[cnt++].suspend_param = resp.types[i];
+ req.start_index = i;
+ } while (resp.remaining);
+
+ for (i = 0; i < susp->num_states; i++) {
+ state = &susp->states[i];
+
+ dreq.suspend_type = state->suspend_param;
+ rc = rpmi_normal_request_with_status(
+ chan, RPMI_HSM_SRV_GET_SUSPEND_INFO,
+ &dreq, rpmi_u32_count(dreq), rpmi_u32_count(dreq),
+ &dresp, rpmi_u32_count(dresp), rpmi_u32_count(dresp));
+ if (rc)
+ return rc;
+
+ state->entry_latency_us = dresp.entry_latency_us;
+ state->exit_latency_us = dresp.exit_latency_us;
+ state->wakeup_latency_us = dresp.wakeup_latency_us;
+ state->min_residency_us = dresp.min_residency_us;
+ }
+
+ return 0;
+}
+
+static int rpmi_hsm_update_hart_scratch(struct mbox_chan *chan,
+ struct rpmi_hsm_suspend *susp)
+{
+ int rc, i;
+ struct rpmi_hsm_get_hart_list_req req;
+ struct rpmi_hsm_get_hart_list_resp resp;
+ struct rpmi_hsm *rpmi = rpmi_hsm_get_pointer(current_hartid());
+
+ req.start_index = 0;
+ do {
+ rc = rpmi_normal_request_with_status(
+ chan, RPMI_HSM_SRV_GET_HART_LIST,
+ &req, rpmi_u32_count(req), rpmi_u32_count(req),
+ &resp, rpmi_u32_count(resp), rpmi_u32_count(resp));
+ if (rc)
+ return rc;
+
+ for (i = 0; i < resp.returned; i++) {
+ rpmi = rpmi_hsm_get_pointer(resp.hartid[i]);
+ if (!rpmi)
+ return SBI_ENOSYS;
+
+ rpmi->chan = chan;
+ rpmi->susp = susp;
+ }
+
+ req.start_index += resp.returned;
+ } while (resp.remaining);
+
+ return 0;
+}
+
+static int rpmi_hsm_cold_init(void *fdt, int nodeoff,
+ const struct fdt_match *match)
+{
+ int rc, i;
+ struct mbox_chan *chan;
+ struct rpmi_hsm_suspend *susp;
+
+ if (!rpmi_hsm_offset) {
+ rpmi_hsm_offset =
+ sbi_scratch_alloc_type_offset(struct rpmi_hsm);
+ if (!rpmi_hsm_offset)
+ return SBI_ENOMEM;
+ }
+
+ /*
+ * If channel request failed then other end does not support
+ * HSM service group so do nothing.
+ */
+ rc = fdt_mailbox_request_chan(fdt, nodeoff, 0, &chan);
+ if (rc)
+ return 0;
+
+ /* Allocate context for HART suspend states */
+ susp = sbi_zalloc(sizeof(*susp));
+ if (!susp)
+ return SBI_ENOMEM;
+
+ /* Get number of HART suspend states */
+ rc = rpmi_hsm_get_num_suspend_states(chan, susp);
+ if (rc)
+ goto fail_free_susp;
+
+ /* Skip HART suspend state discovery for zero HART suspend states */
+ if (!susp->num_states)
+ goto skip_suspend_states;
+
+ /* Allocate array of HART suspend states */
+ susp->states = sbi_calloc(susp->num_states + 1, sizeof(*susp->states));
+ if (!susp->states) {
+ rc = SBI_ENOMEM;
+ goto fail_free_susp;
+ }
+
+ /* Allocate name of each HART suspend state */
+ for (i = 0; i < susp->num_states; i++) {
+ susp->states[i].name =
+ sbi_zalloc(MAX_HSM_SUPSEND_STATE_NAMELEN);
+ if (!susp->states[i].name) {
+ do {
+ i--;
+ sbi_free((void *)susp->states[i].name);
+ } while (i > 0);
+
+ rc = SBI_ENOMEM;
+ goto fail_free_susp_states;
+ }
+ sbi_snprintf((char *)susp->states[i].name,
+ MAX_HSM_SUPSEND_STATE_NAMELEN, "cpu-susp%d", i);
+ }
+
+ /* Get details about each HART suspend state */
+ rc = rpmi_hsm_get_suspend_states(chan, susp);
+ if (rc)
+ goto fail_free_susp_state_names;
+
+skip_suspend_states:
+ /* Update per-HART scratch space */
+ rc = rpmi_hsm_update_hart_scratch(chan, susp);
+ if (rc)
+ goto fail_free_susp_state_names;
+
+ /* Register HSM device */
+ if (!susp->num_states)
+ sbi_hsm_rpmi.hart_suspend = NULL;
+ sbi_hsm_set_device(&sbi_hsm_rpmi);
+
+ return 0;
+
+fail_free_susp_state_names:
+ for (i = 0; i < susp->num_states; i++)
+ sbi_free((void *)susp->states[i].name);
+fail_free_susp_states:
+ if (susp->num_states)
+ sbi_free(susp->states);
+fail_free_susp:
+ sbi_free(susp);
+ return rc;
+}
+
+static const struct fdt_match rpmi_hsm_match[] = {
+ { .compatible = "riscv,rpmi-hsm" },
+ {},
+};
+
+struct fdt_hsm fdt_hsm_rpmi = {
+ .match_table = rpmi_hsm_match,
+ .fdt_fixup = rpmi_hsm_fixup,
+ .cold_init = rpmi_hsm_cold_init,
+};
diff --git a/lib/utils/hsm/objects.mk b/lib/utils/hsm/objects.mk
index 49337bf5..b54b6f6c 100644
--- a/lib/utils/hsm/objects.mk
+++ b/lib/utils/hsm/objects.mk
@@ -9,3 +9,6 @@
libsbiutils-objs-$(CONFIG_FDT_HSM) += hsm/fdt_hsm.o
libsbiutils-objs-$(CONFIG_FDT_HSM) += hsm/fdt_hsm_drivers.carray.o
+
+carray-fdt_hsm_drivers-$(CONFIG_FDT_HSM_RPMI) += fdt_hsm_rpmi
+libsbiutils-objs-$(CONFIG_FDT_HSM_RPMI) += hsm/fdt_hsm_rpmi.o
diff --git a/platform/generic/configs/defconfig b/platform/generic/configs/defconfig
index 2efc7136..78fc96b6 100644
--- a/platform/generic/configs/defconfig
+++ b/platform/generic/configs/defconfig
@@ -11,6 +11,7 @@ CONFIG_FDT_GPIO_DESIGNWARE=y
CONFIG_FDT_GPIO_SIFIVE=y
CONFIG_FDT_GPIO_STARFIVE=y
CONFIG_FDT_HSM=y
+CONFIG_FDT_HSM_RPMI=y
CONFIG_FDT_I2C=y
CONFIG_FDT_I2C_SIFIVE=y
CONFIG_FDT_I2C_DW=y
--
2.34.1
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