diff options
Diffstat (limited to 'drivers/platform/x86/amd/hsmp/acpi.c')
| -rw-r--r-- | drivers/platform/x86/amd/hsmp/acpi.c | 643 |
1 files changed, 643 insertions, 0 deletions
diff --git a/drivers/platform/x86/amd/hsmp/acpi.c b/drivers/platform/x86/amd/hsmp/acpi.c new file mode 100644 index 000000000000..2f1faa82d13e --- /dev/null +++ b/drivers/platform/x86/amd/hsmp/acpi.c @@ -0,0 +1,643 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * AMD HSMP Platform Driver + * Copyright (c) 2024, AMD. + * All Rights Reserved. + * + * This file provides an ACPI based driver implementation for HSMP interface. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <asm/amd/hsmp.h> + +#include <linux/acpi.h> +#include <linux/array_size.h> +#include <linux/bits.h> +#include <linux/bitfield.h> +#include <linux/device.h> +#include <linux/dev_printk.h> +#include <linux/ioport.h> +#include <linux/kstrtox.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/sysfs.h> +#include <linux/uuid.h> + +#include <uapi/asm-generic/errno-base.h> + +#include <asm/amd/node.h> + +#include "hsmp.h" + +#define DRIVER_NAME "hsmp_acpi" + +/* These are the strings specified in ACPI table */ +#define MSG_IDOFF_STR "MsgIdOffset" +#define MSG_ARGOFF_STR "MsgArgOffset" +#define MSG_RESPOFF_STR "MsgRspOffset" + +static struct hsmp_plat_device *hsmp_pdev; + +struct hsmp_sys_attr { + struct device_attribute dattr; + u32 msg_id; +}; + +static int amd_hsmp_acpi_rdwr(struct hsmp_socket *sock, u32 offset, + u32 *value, bool write) +{ + if (write) + iowrite32(*value, sock->virt_base_addr + offset); + else + *value = ioread32(sock->virt_base_addr + offset); + + return 0; +} + +/* This is the UUID used for HSMP */ +static const guid_t acpi_hsmp_uuid = GUID_INIT(0xb74d619d, 0x5707, 0x48bd, + 0xa6, 0x9f, 0x4e, 0xa2, + 0x87, 0x1f, 0xc2, 0xf6); + +static inline bool is_acpi_hsmp_uuid(union acpi_object *obj) +{ + if (obj->type == ACPI_TYPE_BUFFER && obj->buffer.length == UUID_SIZE) + return guid_equal((guid_t *)obj->buffer.pointer, &acpi_hsmp_uuid); + + return false; +} + +static inline int hsmp_get_uid(struct device *dev, u16 *sock_ind) +{ + char *uid; + + /* + * UID (ID00, ID01..IDXX) is used for differentiating sockets, + * read it and strip the "ID" part of it and convert the remaining + * bytes to integer. + */ + uid = acpi_device_uid(ACPI_COMPANION(dev)); + + return kstrtou16(uid + 2, 10, sock_ind); +} + +static acpi_status hsmp_resource(struct acpi_resource *res, void *data) +{ + struct hsmp_socket *sock = data; + struct resource r; + + switch (res->type) { + case ACPI_RESOURCE_TYPE_FIXED_MEMORY32: + if (!acpi_dev_resource_memory(res, &r)) + return AE_ERROR; + if (!r.start || r.end < r.start || !(r.flags & IORESOURCE_MEM_WRITEABLE)) + return AE_ERROR; + sock->mbinfo.base_addr = r.start; + sock->mbinfo.size = resource_size(&r); + break; + case ACPI_RESOURCE_TYPE_END_TAG: + break; + default: + return AE_ERROR; + } + + return AE_OK; +} + +static int hsmp_read_acpi_dsd(struct hsmp_socket *sock) +{ + struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL }; + union acpi_object *guid, *mailbox_package; + union acpi_object *dsd; + acpi_status status; + int ret = 0; + int j; + + status = acpi_evaluate_object_typed(ACPI_HANDLE(sock->dev), "_DSD", NULL, + &buf, ACPI_TYPE_PACKAGE); + if (ACPI_FAILURE(status)) { + dev_err(sock->dev, "Failed to read mailbox reg offsets from DSD table, err: %s\n", + acpi_format_exception(status)); + return -ENODEV; + } + + dsd = buf.pointer; + + /* HSMP _DSD property should contain 2 objects. + * 1. guid which is an acpi object of type ACPI_TYPE_BUFFER + * 2. mailbox which is an acpi object of type ACPI_TYPE_PACKAGE + * This mailbox object contains 3 more acpi objects of type + * ACPI_TYPE_PACKAGE for holding msgid, msgresp, msgarg offsets + * these packages inturn contain 2 acpi objects of type + * ACPI_TYPE_STRING and ACPI_TYPE_INTEGER + */ + if (!dsd || dsd->type != ACPI_TYPE_PACKAGE || dsd->package.count != 2) { + ret = -EINVAL; + goto free_buf; + } + + guid = &dsd->package.elements[0]; + mailbox_package = &dsd->package.elements[1]; + if (!is_acpi_hsmp_uuid(guid) || mailbox_package->type != ACPI_TYPE_PACKAGE) { + dev_err(sock->dev, "Invalid hsmp _DSD table data\n"); + ret = -EINVAL; + goto free_buf; + } + + for (j = 0; j < mailbox_package->package.count; j++) { + union acpi_object *msgobj, *msgstr, *msgint; + + msgobj = &mailbox_package->package.elements[j]; + msgstr = &msgobj->package.elements[0]; + msgint = &msgobj->package.elements[1]; + + /* package should have 1 string and 1 integer object */ + if (msgobj->type != ACPI_TYPE_PACKAGE || + msgstr->type != ACPI_TYPE_STRING || + msgint->type != ACPI_TYPE_INTEGER) { + ret = -EINVAL; + goto free_buf; + } + + if (!strncmp(msgstr->string.pointer, MSG_IDOFF_STR, + msgstr->string.length)) { + sock->mbinfo.msg_id_off = msgint->integer.value; + } else if (!strncmp(msgstr->string.pointer, MSG_RESPOFF_STR, + msgstr->string.length)) { + sock->mbinfo.msg_resp_off = msgint->integer.value; + } else if (!strncmp(msgstr->string.pointer, MSG_ARGOFF_STR, + msgstr->string.length)) { + sock->mbinfo.msg_arg_off = msgint->integer.value; + } else { + ret = -ENOENT; + goto free_buf; + } + } + + if (!sock->mbinfo.msg_id_off || !sock->mbinfo.msg_resp_off || + !sock->mbinfo.msg_arg_off) + ret = -EINVAL; + +free_buf: + ACPI_FREE(buf.pointer); + return ret; +} + +static int hsmp_read_acpi_crs(struct hsmp_socket *sock) +{ + acpi_status status; + + status = acpi_walk_resources(ACPI_HANDLE(sock->dev), METHOD_NAME__CRS, + hsmp_resource, sock); + if (ACPI_FAILURE(status)) { + dev_err(sock->dev, "Failed to look up MP1 base address from CRS method, err: %s\n", + acpi_format_exception(status)); + return -EINVAL; + } + if (!sock->mbinfo.base_addr || !sock->mbinfo.size) + return -EINVAL; + + /* The mapped region should be un-cached */ + sock->virt_base_addr = devm_ioremap_uc(sock->dev, sock->mbinfo.base_addr, + sock->mbinfo.size); + if (!sock->virt_base_addr) { + dev_err(sock->dev, "Failed to ioremap MP1 base address\n"); + return -ENOMEM; + } + + return 0; +} + +/* Parse the ACPI table to read the data */ +static int hsmp_parse_acpi_table(struct device *dev, u16 sock_ind) +{ + struct hsmp_socket *sock = &hsmp_pdev->sock[sock_ind]; + int ret; + + sock->sock_ind = sock_ind; + sock->dev = dev; + sock->amd_hsmp_rdwr = amd_hsmp_acpi_rdwr; + + sema_init(&sock->hsmp_sem, 1); + + dev_set_drvdata(dev, sock); + + /* Read MP1 base address from CRS method */ + ret = hsmp_read_acpi_crs(sock); + if (ret) + return ret; + + /* Read mailbox offsets from DSD table */ + return hsmp_read_acpi_dsd(sock); +} + +static ssize_t hsmp_metric_tbl_acpi_read(struct file *filp, struct kobject *kobj, + const struct bin_attribute *bin_attr, char *buf, + loff_t off, size_t count) +{ + struct device *dev = container_of(kobj, struct device, kobj); + struct hsmp_socket *sock = dev_get_drvdata(dev); + + return hsmp_metric_tbl_read(sock, buf, count); +} + +static umode_t hsmp_is_sock_attr_visible(struct kobject *kobj, + const struct bin_attribute *battr, int id) +{ + if (hsmp_pdev->proto_ver == HSMP_PROTO_VER6) + return battr->attr.mode; + + return 0; +} + +static umode_t hsmp_is_sock_dev_attr_visible(struct kobject *kobj, + struct attribute *attr, int id) +{ + return attr->mode; +} + +#define to_hsmp_sys_attr(_attr) container_of(_attr, struct hsmp_sys_attr, dattr) + +static ssize_t hsmp_msg_resp32_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct hsmp_sys_attr *hattr = to_hsmp_sys_attr(attr); + struct hsmp_socket *sock = dev_get_drvdata(dev); + u32 data; + int ret; + + ret = hsmp_msg_get_nargs(sock->sock_ind, hattr->msg_id, &data, 1); + if (ret) + return ret; + + return sysfs_emit(buf, "%u\n", data); +} + +#define DDR_MAX_BW_MASK GENMASK(31, 20) +#define DDR_UTIL_BW_MASK GENMASK(19, 8) +#define DDR_UTIL_BW_PERC_MASK GENMASK(7, 0) +#define FW_VER_MAJOR_MASK GENMASK(23, 16) +#define FW_VER_MINOR_MASK GENMASK(15, 8) +#define FW_VER_DEBUG_MASK GENMASK(7, 0) +#define FMAX_MASK GENMASK(31, 16) +#define FMIN_MASK GENMASK(15, 0) +#define FREQ_LIMIT_MASK GENMASK(31, 16) +#define FREQ_SRC_IND_MASK GENMASK(15, 0) + +static ssize_t hsmp_ddr_max_bw_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct hsmp_sys_attr *hattr = to_hsmp_sys_attr(attr); + struct hsmp_socket *sock = dev_get_drvdata(dev); + u32 data; + int ret; + + ret = hsmp_msg_get_nargs(sock->sock_ind, hattr->msg_id, &data, 1); + if (ret) + return ret; + + return sysfs_emit(buf, "%lu\n", FIELD_GET(DDR_MAX_BW_MASK, data)); +} + +static ssize_t hsmp_ddr_util_bw_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct hsmp_sys_attr *hattr = to_hsmp_sys_attr(attr); + struct hsmp_socket *sock = dev_get_drvdata(dev); + u32 data; + int ret; + + ret = hsmp_msg_get_nargs(sock->sock_ind, hattr->msg_id, &data, 1); + if (ret) + return ret; + + return sysfs_emit(buf, "%lu\n", FIELD_GET(DDR_UTIL_BW_MASK, data)); +} + +static ssize_t hsmp_ddr_util_bw_perc_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct hsmp_sys_attr *hattr = to_hsmp_sys_attr(attr); + struct hsmp_socket *sock = dev_get_drvdata(dev); + u32 data; + int ret; + + ret = hsmp_msg_get_nargs(sock->sock_ind, hattr->msg_id, &data, 1); + if (ret) + return ret; + + return sysfs_emit(buf, "%lu\n", FIELD_GET(DDR_UTIL_BW_PERC_MASK, data)); +} + +static ssize_t hsmp_msg_fw_ver_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct hsmp_sys_attr *hattr = to_hsmp_sys_attr(attr); + struct hsmp_socket *sock = dev_get_drvdata(dev); + u32 data; + int ret; + + ret = hsmp_msg_get_nargs(sock->sock_ind, hattr->msg_id, &data, 1); + if (ret) + return ret; + + return sysfs_emit(buf, "%lu.%lu.%lu\n", + FIELD_GET(FW_VER_MAJOR_MASK, data), + FIELD_GET(FW_VER_MINOR_MASK, data), + FIELD_GET(FW_VER_DEBUG_MASK, data)); +} + +static ssize_t hsmp_fclk_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct hsmp_sys_attr *hattr = to_hsmp_sys_attr(attr); + struct hsmp_socket *sock = dev_get_drvdata(dev); + u32 data[2]; + int ret; + + ret = hsmp_msg_get_nargs(sock->sock_ind, hattr->msg_id, data, 2); + if (ret) + return ret; + + return sysfs_emit(buf, "%u\n", data[0]); +} + +static ssize_t hsmp_mclk_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct hsmp_sys_attr *hattr = to_hsmp_sys_attr(attr); + struct hsmp_socket *sock = dev_get_drvdata(dev); + u32 data[2]; + int ret; + + ret = hsmp_msg_get_nargs(sock->sock_ind, hattr->msg_id, data, 2); + if (ret) + return ret; + + return sysfs_emit(buf, "%u\n", data[1]); +} + +static ssize_t hsmp_clk_fmax_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct hsmp_sys_attr *hattr = to_hsmp_sys_attr(attr); + struct hsmp_socket *sock = dev_get_drvdata(dev); + u32 data; + int ret; + + ret = hsmp_msg_get_nargs(sock->sock_ind, hattr->msg_id, &data, 1); + if (ret) + return ret; + + return sysfs_emit(buf, "%lu\n", FIELD_GET(FMAX_MASK, data)); +} + +static ssize_t hsmp_clk_fmin_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct hsmp_sys_attr *hattr = to_hsmp_sys_attr(attr); + struct hsmp_socket *sock = dev_get_drvdata(dev); + u32 data; + int ret; + + ret = hsmp_msg_get_nargs(sock->sock_ind, hattr->msg_id, &data, 1); + if (ret) + return ret; + + return sysfs_emit(buf, "%lu\n", FIELD_GET(FMIN_MASK, data)); +} + +static ssize_t hsmp_freq_limit_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct hsmp_sys_attr *hattr = to_hsmp_sys_attr(attr); + struct hsmp_socket *sock = dev_get_drvdata(dev); + u32 data; + int ret; + + ret = hsmp_msg_get_nargs(sock->sock_ind, hattr->msg_id, &data, 1); + if (ret) + return ret; + + return sysfs_emit(buf, "%lu\n", FIELD_GET(FREQ_LIMIT_MASK, data)); +} + +static const char * const freqlimit_srcnames[] = { + "cHTC-Active", + "PROCHOT", + "TDC limit", + "PPT Limit", + "OPN Max", + "Reliability Limit", + "APML Agent", + "HSMP Agent", +}; + +static ssize_t hsmp_freq_limit_source_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct hsmp_sys_attr *hattr = to_hsmp_sys_attr(attr); + struct hsmp_socket *sock = dev_get_drvdata(dev); + unsigned int index; + int len = 0; + u16 src_ind; + u32 data; + int ret; + + ret = hsmp_msg_get_nargs(sock->sock_ind, hattr->msg_id, &data, 1); + if (ret) + return ret; + + src_ind = FIELD_GET(FREQ_SRC_IND_MASK, data); + for (index = 0; index < ARRAY_SIZE(freqlimit_srcnames); index++) { + if (!src_ind) + break; + if (src_ind & 1) + len += sysfs_emit_at(buf, len, "%s\n", freqlimit_srcnames[index]); + src_ind >>= 1; + } + return len; +} + +static int init_acpi(struct device *dev) +{ + u16 sock_ind; + int ret; + + ret = hsmp_get_uid(dev, &sock_ind); + if (ret) + return ret; + if (sock_ind >= hsmp_pdev->num_sockets) + return -EINVAL; + + ret = hsmp_parse_acpi_table(dev, sock_ind); + if (ret) { + dev_err(dev, "Failed to parse ACPI table\n"); + return ret; + } + + /* Test the hsmp interface */ + ret = hsmp_test(sock_ind, 0xDEADBEEF); + if (ret) { + dev_err(dev, "HSMP test message failed on Fam:%x model:%x\n", + boot_cpu_data.x86, boot_cpu_data.x86_model); + dev_err(dev, "Is HSMP disabled in BIOS ?\n"); + return ret; + } + + ret = hsmp_cache_proto_ver(sock_ind); + if (ret) { + dev_err(dev, "Failed to read HSMP protocol version\n"); + return ret; + } + + if (hsmp_pdev->proto_ver == HSMP_PROTO_VER6) { + ret = hsmp_get_tbl_dram_base(sock_ind); + if (ret) + dev_err(dev, "Failed to init metric table\n"); + } + + ret = hsmp_create_sensor(dev, sock_ind); + if (ret) + dev_err(dev, "Failed to register HSMP sensors with hwmon\n"); + + dev_set_drvdata(dev, &hsmp_pdev->sock[sock_ind]); + + return ret; +} + +static const struct bin_attribute hsmp_metric_tbl_attr = { + .attr = { .name = HSMP_METRICS_TABLE_NAME, .mode = 0444}, + .read_new = hsmp_metric_tbl_acpi_read, + .size = sizeof(struct hsmp_metric_table), +}; + +static const struct bin_attribute *hsmp_attr_list[] = { + &hsmp_metric_tbl_attr, + NULL +}; + +#define HSMP_DEV_ATTR(_name, _msg_id, _show, _mode) \ +static struct hsmp_sys_attr hattr_##_name = { \ + .dattr = __ATTR(_name, _mode, _show, NULL), \ + .msg_id = _msg_id, \ +} + +HSMP_DEV_ATTR(c0_residency_input, HSMP_GET_C0_PERCENT, hsmp_msg_resp32_show, 0444); +HSMP_DEV_ATTR(prochot_status, HSMP_GET_PROC_HOT, hsmp_msg_resp32_show, 0444); +HSMP_DEV_ATTR(smu_fw_version, HSMP_GET_SMU_VER, hsmp_msg_fw_ver_show, 0444); +HSMP_DEV_ATTR(protocol_version, HSMP_GET_PROTO_VER, hsmp_msg_resp32_show, 0444); +HSMP_DEV_ATTR(cclk_freq_limit_input, HSMP_GET_CCLK_THROTTLE_LIMIT, hsmp_msg_resp32_show, 0444); +HSMP_DEV_ATTR(ddr_max_bw, HSMP_GET_DDR_BANDWIDTH, hsmp_ddr_max_bw_show, 0444); +HSMP_DEV_ATTR(ddr_utilised_bw_input, HSMP_GET_DDR_BANDWIDTH, hsmp_ddr_util_bw_show, 0444); +HSMP_DEV_ATTR(ddr_utilised_bw_perc_input, HSMP_GET_DDR_BANDWIDTH, hsmp_ddr_util_bw_perc_show, 0444); +HSMP_DEV_ATTR(fclk_input, HSMP_GET_FCLK_MCLK, hsmp_fclk_show, 0444); +HSMP_DEV_ATTR(mclk_input, HSMP_GET_FCLK_MCLK, hsmp_mclk_show, 0444); +HSMP_DEV_ATTR(clk_fmax, HSMP_GET_SOCKET_FMAX_FMIN, hsmp_clk_fmax_show, 0444); +HSMP_DEV_ATTR(clk_fmin, HSMP_GET_SOCKET_FMAX_FMIN, hsmp_clk_fmin_show, 0444); +HSMP_DEV_ATTR(pwr_current_active_freq_limit, HSMP_GET_SOCKET_FREQ_LIMIT, + hsmp_freq_limit_show, 0444); +HSMP_DEV_ATTR(pwr_current_active_freq_limit_source, HSMP_GET_SOCKET_FREQ_LIMIT, + hsmp_freq_limit_source_show, 0444); + +static struct attribute *hsmp_dev_attr_list[] = { + &hattr_c0_residency_input.dattr.attr, + &hattr_prochot_status.dattr.attr, + &hattr_smu_fw_version.dattr.attr, + &hattr_protocol_version.dattr.attr, + &hattr_cclk_freq_limit_input.dattr.attr, + &hattr_ddr_max_bw.dattr.attr, + &hattr_ddr_utilised_bw_input.dattr.attr, + &hattr_ddr_utilised_bw_perc_input.dattr.attr, + &hattr_fclk_input.dattr.attr, + &hattr_mclk_input.dattr.attr, + &hattr_clk_fmax.dattr.attr, + &hattr_clk_fmin.dattr.attr, + &hattr_pwr_current_active_freq_limit.dattr.attr, + &hattr_pwr_current_active_freq_limit_source.dattr.attr, + NULL +}; + +static const struct attribute_group hsmp_attr_grp = { + .bin_attrs_new = hsmp_attr_list, + .attrs = hsmp_dev_attr_list, + .is_bin_visible = hsmp_is_sock_attr_visible, + .is_visible = hsmp_is_sock_dev_attr_visible, +}; + +static const struct attribute_group *hsmp_groups[] = { + &hsmp_attr_grp, + NULL +}; + +static const struct acpi_device_id amd_hsmp_acpi_ids[] = { + {ACPI_HSMP_DEVICE_HID, 0}, + {} +}; +MODULE_DEVICE_TABLE(acpi, amd_hsmp_acpi_ids); + +static int hsmp_acpi_probe(struct platform_device *pdev) +{ + int ret; + + hsmp_pdev = get_hsmp_pdev(); + if (!hsmp_pdev) + return -ENOMEM; + + if (!hsmp_pdev->is_probed) { + hsmp_pdev->num_sockets = amd_num_nodes(); + if (hsmp_pdev->num_sockets == 0 || hsmp_pdev->num_sockets > MAX_AMD_NUM_NODES) + return -ENODEV; + + hsmp_pdev->sock = devm_kcalloc(&pdev->dev, hsmp_pdev->num_sockets, + sizeof(*hsmp_pdev->sock), + GFP_KERNEL); + if (!hsmp_pdev->sock) + return -ENOMEM; + } + + ret = init_acpi(&pdev->dev); + if (ret) { + dev_err(&pdev->dev, "Failed to initialize HSMP interface.\n"); + return ret; + } + + if (!hsmp_pdev->is_probed) { + ret = hsmp_misc_register(&pdev->dev); + if (ret) + return ret; + hsmp_pdev->is_probed = true; + } + + return 0; +} + +static void hsmp_acpi_remove(struct platform_device *pdev) +{ + /* + * We register only one misc_device even on multi-socket system. + * So, deregister should happen only once. + */ + if (hsmp_pdev->is_probed) { + hsmp_misc_deregister(); + hsmp_pdev->is_probed = false; + } +} + +static struct platform_driver amd_hsmp_driver = { + .probe = hsmp_acpi_probe, + .remove = hsmp_acpi_remove, + .driver = { + .name = DRIVER_NAME, + .acpi_match_table = amd_hsmp_acpi_ids, + .dev_groups = hsmp_groups, + }, +}; + +module_platform_driver(amd_hsmp_driver); + +MODULE_IMPORT_NS("AMD_HSMP"); +MODULE_DESCRIPTION("AMD HSMP Platform Interface Driver"); +MODULE_VERSION(DRIVER_VERSION); +MODULE_LICENSE("GPL"); |