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1// SPDX-License-Identifier: GPL-2.02/*3 * AMD HSMP Platform Driver4 * Copyright (c) 2022, AMD.5 * All Rights Reserved.6 *7 * This file provides a device implementation for HSMP interface8 */9 10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt11 12#include <asm/amd_hsmp.h>13#include <asm/amd_nb.h>14#include <linux/delay.h>15#include <linux/io.h>16#include <linux/miscdevice.h>17#include <linux/module.h>18#include <linux/pci.h>19#include <linux/platform_device.h>20#include <linux/semaphore.h>21#include <linux/acpi.h>22 23#define DRIVER_NAME "amd_hsmp"24#define DRIVER_VERSION "2.2"25#define ACPI_HSMP_DEVICE_HID "AMDI0097"26 27/* HSMP Status / Error codes */28#define HSMP_STATUS_NOT_READY 0x0029#define HSMP_STATUS_OK 0x0130#define HSMP_ERR_INVALID_MSG 0xFE31#define HSMP_ERR_INVALID_INPUT 0xFF32 33/* Timeout in millsec */34#define HSMP_MSG_TIMEOUT 10035#define HSMP_SHORT_SLEEP 136 37#define HSMP_WR true38#define HSMP_RD false39 40/*41 * To access specific HSMP mailbox register, s/w writes the SMN address of HSMP mailbox42 * register into the SMN_INDEX register, and reads/writes the SMN_DATA reg.43 * Below are required SMN address for HSMP Mailbox register offsets in SMU address space44 */45#define SMN_HSMP_BASE 0x3B0000046#define SMN_HSMP_MSG_ID 0x001053447#define SMN_HSMP_MSG_ID_F1A_M0H 0x001093448#define SMN_HSMP_MSG_RESP 0x001098049#define SMN_HSMP_MSG_DATA 0x00109E050 51#define HSMP_INDEX_REG 0xc452#define HSMP_DATA_REG 0xc853 54#define HSMP_CDEV_NAME "hsmp_cdev"55#define HSMP_DEVNODE_NAME "hsmp"56#define HSMP_METRICS_TABLE_NAME "metrics_bin"57 58#define HSMP_ATTR_GRP_NAME_SIZE 1059 60/* These are the strings specified in ACPI table */61#define MSG_IDOFF_STR "MsgIdOffset"62#define MSG_ARGOFF_STR "MsgArgOffset"63#define MSG_RESPOFF_STR "MsgRspOffset"64 65#define MAX_AMD_SOCKETS 866 67struct hsmp_mbaddr_info {68 u32 base_addr;69 u32 msg_id_off;70 u32 msg_resp_off;71 u32 msg_arg_off;72 u32 size;73};74 75struct hsmp_socket {76 struct bin_attribute hsmp_attr;77 struct hsmp_mbaddr_info mbinfo;78 void __iomem *metric_tbl_addr;79 void __iomem *virt_base_addr;80 struct semaphore hsmp_sem;81 char name[HSMP_ATTR_GRP_NAME_SIZE];82 struct pci_dev *root;83 struct device *dev;84 u16 sock_ind;85};86 87struct hsmp_plat_device {88 struct miscdevice hsmp_device;89 struct hsmp_socket *sock;90 u32 proto_ver;91 u16 num_sockets;92 bool is_acpi_device;93 bool is_probed;94};95 96static struct hsmp_plat_device plat_dev;97 98static int amd_hsmp_pci_rdwr(struct hsmp_socket *sock, u32 offset,99 u32 *value, bool write)100{101 int ret;102 103 if (!sock->root)104 return -ENODEV;105 106 ret = pci_write_config_dword(sock->root, HSMP_INDEX_REG,107 sock->mbinfo.base_addr + offset);108 if (ret)109 return ret;110 111 ret = (write ? pci_write_config_dword(sock->root, HSMP_DATA_REG, *value)112 : pci_read_config_dword(sock->root, HSMP_DATA_REG, value));113 114 return ret;115}116 117static void amd_hsmp_acpi_rdwr(struct hsmp_socket *sock, u32 offset,118 u32 *value, bool write)119{120 if (write)121 iowrite32(*value, sock->virt_base_addr + offset);122 else123 *value = ioread32(sock->virt_base_addr + offset);124}125 126static int amd_hsmp_rdwr(struct hsmp_socket *sock, u32 offset,127 u32 *value, bool write)128{129 if (plat_dev.is_acpi_device)130 amd_hsmp_acpi_rdwr(sock, offset, value, write);131 else132 return amd_hsmp_pci_rdwr(sock, offset, value, write);133 134 return 0;135}136 137/*138 * Send a message to the HSMP port via PCI-e config space registers139 * or by writing to MMIO space.140 *141 * The caller is expected to zero out any unused arguments.142 * If a response is expected, the number of response words should be greater than 0.143 *144 * Returns 0 for success and populates the requested number of arguments.145 * Returns a negative error code for failure.146 */147static int __hsmp_send_message(struct hsmp_socket *sock, struct hsmp_message *msg)148{149 struct hsmp_mbaddr_info *mbinfo;150 unsigned long timeout, short_sleep;151 u32 mbox_status;152 u32 index;153 int ret;154 155 mbinfo = &sock->mbinfo;156 157 /* Clear the status register */158 mbox_status = HSMP_STATUS_NOT_READY;159 ret = amd_hsmp_rdwr(sock, mbinfo->msg_resp_off, &mbox_status, HSMP_WR);160 if (ret) {161 pr_err("Error %d clearing mailbox status register\n", ret);162 return ret;163 }164 165 index = 0;166 /* Write any message arguments */167 while (index < msg->num_args) {168 ret = amd_hsmp_rdwr(sock, mbinfo->msg_arg_off + (index << 2),169 &msg->args[index], HSMP_WR);170 if (ret) {171 pr_err("Error %d writing message argument %d\n", ret, index);172 return ret;173 }174 index++;175 }176 177 /* Write the message ID which starts the operation */178 ret = amd_hsmp_rdwr(sock, mbinfo->msg_id_off, &msg->msg_id, HSMP_WR);179 if (ret) {180 pr_err("Error %d writing message ID %u\n", ret, msg->msg_id);181 return ret;182 }183 184 /*185 * Depending on when the trigger write completes relative to the SMU186 * firmware 1 ms cycle, the operation may take from tens of us to 1 ms187 * to complete. Some operations may take more. Therefore we will try188 * a few short duration sleeps and switch to long sleeps if we don't189 * succeed quickly.190 */191 short_sleep = jiffies + msecs_to_jiffies(HSMP_SHORT_SLEEP);192 timeout = jiffies + msecs_to_jiffies(HSMP_MSG_TIMEOUT);193 194 while (time_before(jiffies, timeout)) {195 ret = amd_hsmp_rdwr(sock, mbinfo->msg_resp_off, &mbox_status, HSMP_RD);196 if (ret) {197 pr_err("Error %d reading mailbox status\n", ret);198 return ret;199 }200 201 if (mbox_status != HSMP_STATUS_NOT_READY)202 break;203 if (time_before(jiffies, short_sleep))204 usleep_range(50, 100);205 else206 usleep_range(1000, 2000);207 }208 209 if (unlikely(mbox_status == HSMP_STATUS_NOT_READY)) {210 return -ETIMEDOUT;211 } else if (unlikely(mbox_status == HSMP_ERR_INVALID_MSG)) {212 return -ENOMSG;213 } else if (unlikely(mbox_status == HSMP_ERR_INVALID_INPUT)) {214 return -EINVAL;215 } else if (unlikely(mbox_status != HSMP_STATUS_OK)) {216 pr_err("Message ID %u unknown failure (status = 0x%X)\n",217 msg->msg_id, mbox_status);218 return -EIO;219 }220 221 /*222 * SMU has responded OK. Read response data.223 * SMU reads the input arguments from eight 32 bit registers starting224 * from SMN_HSMP_MSG_DATA and writes the response data to the same225 * SMN_HSMP_MSG_DATA address.226 * We copy the response data if any, back to the args[].227 */228 index = 0;229 while (index < msg->response_sz) {230 ret = amd_hsmp_rdwr(sock, mbinfo->msg_arg_off + (index << 2),231 &msg->args[index], HSMP_RD);232 if (ret) {233 pr_err("Error %d reading response %u for message ID:%u\n",234 ret, index, msg->msg_id);235 break;236 }237 index++;238 }239 240 return ret;241}242 243static int validate_message(struct hsmp_message *msg)244{245 /* msg_id against valid range of message IDs */246 if (msg->msg_id < HSMP_TEST || msg->msg_id >= HSMP_MSG_ID_MAX)247 return -ENOMSG;248 249 /* msg_id is a reserved message ID */250 if (hsmp_msg_desc_table[msg->msg_id].type == HSMP_RSVD)251 return -ENOMSG;252 253 /* num_args and response_sz against the HSMP spec */254 if (msg->num_args != hsmp_msg_desc_table[msg->msg_id].num_args ||255 msg->response_sz != hsmp_msg_desc_table[msg->msg_id].response_sz)256 return -EINVAL;257 258 return 0;259}260 261int hsmp_send_message(struct hsmp_message *msg)262{263 struct hsmp_socket *sock;264 int ret;265 266 if (!msg)267 return -EINVAL;268 ret = validate_message(msg);269 if (ret)270 return ret;271 272 if (!plat_dev.sock || msg->sock_ind >= plat_dev.num_sockets)273 return -ENODEV;274 sock = &plat_dev.sock[msg->sock_ind];275 276 /*277 * The time taken by smu operation to complete is between278 * 10us to 1ms. Sometime it may take more time.279 * In SMP system timeout of 100 millisecs should280 * be enough for the previous thread to finish the operation281 */282 ret = down_timeout(&sock->hsmp_sem, msecs_to_jiffies(HSMP_MSG_TIMEOUT));283 if (ret < 0)284 return ret;285 286 ret = __hsmp_send_message(sock, msg);287 288 up(&sock->hsmp_sem);289 290 return ret;291}292EXPORT_SYMBOL_GPL(hsmp_send_message);293 294static int hsmp_test(u16 sock_ind, u32 value)295{296 struct hsmp_message msg = { 0 };297 int ret;298 299 /*300 * Test the hsmp port by performing TEST command. The test message301 * takes one argument and returns the value of that argument + 1.302 */303 msg.msg_id = HSMP_TEST;304 msg.num_args = 1;305 msg.response_sz = 1;306 msg.args[0] = value;307 msg.sock_ind = sock_ind;308 309 ret = hsmp_send_message(&msg);310 if (ret)311 return ret;312 313 /* Check the response value */314 if (msg.args[0] != (value + 1)) {315 dev_err(plat_dev.sock[sock_ind].dev,316 "Socket %d test message failed, Expected 0x%08X, received 0x%08X\n",317 sock_ind, (value + 1), msg.args[0]);318 return -EBADE;319 }320 321 return ret;322}323 324static long hsmp_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)325{326 int __user *arguser = (int __user *)arg;327 struct hsmp_message msg = { 0 };328 int ret;329 330 if (copy_struct_from_user(&msg, sizeof(msg), arguser, sizeof(struct hsmp_message)))331 return -EFAULT;332 333 /*334 * Check msg_id is within the range of supported msg ids335 * i.e within the array bounds of hsmp_msg_desc_table336 */337 if (msg.msg_id < HSMP_TEST || msg.msg_id >= HSMP_MSG_ID_MAX)338 return -ENOMSG;339 340 switch (fp->f_mode & (FMODE_WRITE | FMODE_READ)) {341 case FMODE_WRITE:342 /*343 * Device is opened in O_WRONLY mode344 * Execute only set/configure commands345 */346 if (hsmp_msg_desc_table[msg.msg_id].type != HSMP_SET)347 return -EINVAL;348 break;349 case FMODE_READ:350 /*351 * Device is opened in O_RDONLY mode352 * Execute only get/monitor commands353 */354 if (hsmp_msg_desc_table[msg.msg_id].type != HSMP_GET)355 return -EINVAL;356 break;357 case FMODE_READ | FMODE_WRITE:358 /*359 * Device is opened in O_RDWR mode360 * Execute both get/monitor and set/configure commands361 */362 break;363 default:364 return -EINVAL;365 }366 367 ret = hsmp_send_message(&msg);368 if (ret)369 return ret;370 371 if (hsmp_msg_desc_table[msg.msg_id].response_sz > 0) {372 /* Copy results back to user for get/monitor commands */373 if (copy_to_user(arguser, &msg, sizeof(struct hsmp_message)))374 return -EFAULT;375 }376 377 return 0;378}379 380static const struct file_operations hsmp_fops = {381 .owner = THIS_MODULE,382 .unlocked_ioctl = hsmp_ioctl,383 .compat_ioctl = hsmp_ioctl,384};385 386/* This is the UUID used for HSMP */387static const guid_t acpi_hsmp_uuid = GUID_INIT(0xb74d619d, 0x5707, 0x48bd,388 0xa6, 0x9f, 0x4e, 0xa2,389 0x87, 0x1f, 0xc2, 0xf6);390 391static inline bool is_acpi_hsmp_uuid(union acpi_object *obj)392{393 if (obj->type == ACPI_TYPE_BUFFER && obj->buffer.length == UUID_SIZE)394 return guid_equal((guid_t *)obj->buffer.pointer, &acpi_hsmp_uuid);395 396 return false;397}398 399static inline int hsmp_get_uid(struct device *dev, u16 *sock_ind)400{401 char *uid;402 403 /*404 * UID (ID00, ID01..IDXX) is used for differentiating sockets,405 * read it and strip the "ID" part of it and convert the remaining406 * bytes to integer.407 */408 uid = acpi_device_uid(ACPI_COMPANION(dev));409 410 return kstrtou16(uid + 2, 10, sock_ind);411}412 413static acpi_status hsmp_resource(struct acpi_resource *res, void *data)414{415 struct hsmp_socket *sock = data;416 struct resource r;417 418 switch (res->type) {419 case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:420 if (!acpi_dev_resource_memory(res, &r))421 return AE_ERROR;422 if (!r.start || r.end < r.start || !(r.flags & IORESOURCE_MEM_WRITEABLE))423 return AE_ERROR;424 sock->mbinfo.base_addr = r.start;425 sock->mbinfo.size = resource_size(&r);426 break;427 case ACPI_RESOURCE_TYPE_END_TAG:428 break;429 default:430 return AE_ERROR;431 }432 433 return AE_OK;434}435 436static int hsmp_read_acpi_dsd(struct hsmp_socket *sock)437{438 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };439 union acpi_object *guid, *mailbox_package;440 union acpi_object *dsd;441 acpi_status status;442 int ret = 0;443 int j;444 445 status = acpi_evaluate_object_typed(ACPI_HANDLE(sock->dev), "_DSD", NULL,446 &buf, ACPI_TYPE_PACKAGE);447 if (ACPI_FAILURE(status)) {448 dev_err(sock->dev, "Failed to read mailbox reg offsets from DSD table, err: %s\n",449 acpi_format_exception(status));450 return -ENODEV;451 }452 453 dsd = buf.pointer;454 455 /* HSMP _DSD property should contain 2 objects.456 * 1. guid which is an acpi object of type ACPI_TYPE_BUFFER457 * 2. mailbox which is an acpi object of type ACPI_TYPE_PACKAGE458 * This mailbox object contains 3 more acpi objects of type459 * ACPI_TYPE_PACKAGE for holding msgid, msgresp, msgarg offsets460 * these packages inturn contain 2 acpi objects of type461 * ACPI_TYPE_STRING and ACPI_TYPE_INTEGER462 */463 if (!dsd || dsd->type != ACPI_TYPE_PACKAGE || dsd->package.count != 2) {464 ret = -EINVAL;465 goto free_buf;466 }467 468 guid = &dsd->package.elements[0];469 mailbox_package = &dsd->package.elements[1];470 if (!is_acpi_hsmp_uuid(guid) || mailbox_package->type != ACPI_TYPE_PACKAGE) {471 dev_err(sock->dev, "Invalid hsmp _DSD table data\n");472 ret = -EINVAL;473 goto free_buf;474 }475 476 for (j = 0; j < mailbox_package->package.count; j++) {477 union acpi_object *msgobj, *msgstr, *msgint;478 479 msgobj = &mailbox_package->package.elements[j];480 msgstr = &msgobj->package.elements[0];481 msgint = &msgobj->package.elements[1];482 483 /* package should have 1 string and 1 integer object */484 if (msgobj->type != ACPI_TYPE_PACKAGE ||485 msgstr->type != ACPI_TYPE_STRING ||486 msgint->type != ACPI_TYPE_INTEGER) {487 ret = -EINVAL;488 goto free_buf;489 }490 491 if (!strncmp(msgstr->string.pointer, MSG_IDOFF_STR,492 msgstr->string.length)) {493 sock->mbinfo.msg_id_off = msgint->integer.value;494 } else if (!strncmp(msgstr->string.pointer, MSG_RESPOFF_STR,495 msgstr->string.length)) {496 sock->mbinfo.msg_resp_off = msgint->integer.value;497 } else if (!strncmp(msgstr->string.pointer, MSG_ARGOFF_STR,498 msgstr->string.length)) {499 sock->mbinfo.msg_arg_off = msgint->integer.value;500 } else {501 ret = -ENOENT;502 goto free_buf;503 }504 }505 506 if (!sock->mbinfo.msg_id_off || !sock->mbinfo.msg_resp_off ||507 !sock->mbinfo.msg_arg_off)508 ret = -EINVAL;509 510free_buf:511 ACPI_FREE(buf.pointer);512 return ret;513}514 515static int hsmp_read_acpi_crs(struct hsmp_socket *sock)516{517 acpi_status status;518 519 status = acpi_walk_resources(ACPI_HANDLE(sock->dev), METHOD_NAME__CRS,520 hsmp_resource, sock);521 if (ACPI_FAILURE(status)) {522 dev_err(sock->dev, "Failed to look up MP1 base address from CRS method, err: %s\n",523 acpi_format_exception(status));524 return -EINVAL;525 }526 if (!sock->mbinfo.base_addr || !sock->mbinfo.size)527 return -EINVAL;528 529 /* The mapped region should be un cached */530 sock->virt_base_addr = devm_ioremap_uc(sock->dev, sock->mbinfo.base_addr,531 sock->mbinfo.size);532 if (!sock->virt_base_addr) {533 dev_err(sock->dev, "Failed to ioremap MP1 base address\n");534 return -ENOMEM;535 }536 537 return 0;538}539 540/* Parse the ACPI table to read the data */541static int hsmp_parse_acpi_table(struct device *dev, u16 sock_ind)542{543 struct hsmp_socket *sock = &plat_dev.sock[sock_ind];544 int ret;545 546 sock->sock_ind = sock_ind;547 sock->dev = dev;548 plat_dev.is_acpi_device = true;549 550 sema_init(&sock->hsmp_sem, 1);551 552 /* Read MP1 base address from CRS method */553 ret = hsmp_read_acpi_crs(sock);554 if (ret)555 return ret;556 557 /* Read mailbox offsets from DSD table */558 return hsmp_read_acpi_dsd(sock);559}560 561static ssize_t hsmp_metric_tbl_read(struct file *filp, struct kobject *kobj,562 struct bin_attribute *bin_attr, char *buf,563 loff_t off, size_t count)564{565 struct hsmp_socket *sock = bin_attr->private;566 struct hsmp_message msg = { 0 };567 int ret;568 569 if (!sock)570 return -EINVAL;571 572 /* Do not support lseek(), reads entire metric table */573 if (count < bin_attr->size) {574 dev_err(sock->dev, "Wrong buffer size\n");575 return -EINVAL;576 }577 578 msg.msg_id = HSMP_GET_METRIC_TABLE;579 msg.sock_ind = sock->sock_ind;580 581 ret = hsmp_send_message(&msg);582 if (ret)583 return ret;584 memcpy_fromio(buf, sock->metric_tbl_addr, bin_attr->size);585 586 return bin_attr->size;587}588 589static int hsmp_get_tbl_dram_base(u16 sock_ind)590{591 struct hsmp_socket *sock = &plat_dev.sock[sock_ind];592 struct hsmp_message msg = { 0 };593 phys_addr_t dram_addr;594 int ret;595 596 msg.sock_ind = sock_ind;597 msg.response_sz = hsmp_msg_desc_table[HSMP_GET_METRIC_TABLE_DRAM_ADDR].response_sz;598 msg.msg_id = HSMP_GET_METRIC_TABLE_DRAM_ADDR;599 600 ret = hsmp_send_message(&msg);601 if (ret)602 return ret;603 604 /*605 * calculate the metric table DRAM address from lower and upper 32 bits606 * sent from SMU and ioremap it to virtual address.607 */608 dram_addr = msg.args[0] | ((u64)(msg.args[1]) << 32);609 if (!dram_addr) {610 dev_err(sock->dev, "Invalid DRAM address for metric table\n");611 return -ENOMEM;612 }613 sock->metric_tbl_addr = devm_ioremap(sock->dev, dram_addr,614 sizeof(struct hsmp_metric_table));615 if (!sock->metric_tbl_addr) {616 dev_err(sock->dev, "Failed to ioremap metric table addr\n");617 return -ENOMEM;618 }619 return 0;620}621 622static umode_t hsmp_is_sock_attr_visible(struct kobject *kobj,623 struct bin_attribute *battr, int id)624{625 if (plat_dev.proto_ver == HSMP_PROTO_VER6)626 return battr->attr.mode;627 else628 return 0;629}630 631static int hsmp_init_metric_tbl_bin_attr(struct bin_attribute **hattrs, u16 sock_ind)632{633 struct bin_attribute *hattr = &plat_dev.sock[sock_ind].hsmp_attr;634 635 sysfs_bin_attr_init(hattr);636 hattr->attr.name = HSMP_METRICS_TABLE_NAME;637 hattr->attr.mode = 0444;638 hattr->read = hsmp_metric_tbl_read;639 hattr->size = sizeof(struct hsmp_metric_table);640 hattr->private = &plat_dev.sock[sock_ind];641 hattrs[0] = hattr;642 643 if (plat_dev.proto_ver == HSMP_PROTO_VER6)644 return hsmp_get_tbl_dram_base(sock_ind);645 else646 return 0;647}648 649/* One bin sysfs for metrics table */650#define NUM_HSMP_ATTRS 1651 652static int hsmp_create_attr_list(struct attribute_group *attr_grp,653 struct device *dev, u16 sock_ind)654{655 struct bin_attribute **hsmp_bin_attrs;656 657 /* Null terminated list of attributes */658 hsmp_bin_attrs = devm_kcalloc(dev, NUM_HSMP_ATTRS + 1,659 sizeof(*hsmp_bin_attrs),660 GFP_KERNEL);661 if (!hsmp_bin_attrs)662 return -ENOMEM;663 664 attr_grp->bin_attrs = hsmp_bin_attrs;665 666 return hsmp_init_metric_tbl_bin_attr(hsmp_bin_attrs, sock_ind);667}668 669static int hsmp_create_non_acpi_sysfs_if(struct device *dev)670{671 const struct attribute_group **hsmp_attr_grps;672 struct attribute_group *attr_grp;673 u16 i;674 675 hsmp_attr_grps = devm_kcalloc(dev, plat_dev.num_sockets + 1,676 sizeof(*hsmp_attr_grps),677 GFP_KERNEL);678 if (!hsmp_attr_grps)679 return -ENOMEM;680 681 /* Create a sysfs directory for each socket */682 for (i = 0; i < plat_dev.num_sockets; i++) {683 attr_grp = devm_kzalloc(dev, sizeof(struct attribute_group),684 GFP_KERNEL);685 if (!attr_grp)686 return -ENOMEM;687 688 snprintf(plat_dev.sock[i].name, HSMP_ATTR_GRP_NAME_SIZE, "socket%u", (u8)i);689 attr_grp->name = plat_dev.sock[i].name;690 attr_grp->is_bin_visible = hsmp_is_sock_attr_visible;691 hsmp_attr_grps[i] = attr_grp;692 693 hsmp_create_attr_list(attr_grp, dev, i);694 }695 696 return device_add_groups(dev, hsmp_attr_grps);697}698 699static int hsmp_create_acpi_sysfs_if(struct device *dev)700{701 struct attribute_group *attr_grp;702 u16 sock_ind;703 int ret;704 705 attr_grp = devm_kzalloc(dev, sizeof(struct attribute_group), GFP_KERNEL);706 if (!attr_grp)707 return -ENOMEM;708 709 attr_grp->is_bin_visible = hsmp_is_sock_attr_visible;710 711 ret = hsmp_get_uid(dev, &sock_ind);712 if (ret)713 return ret;714 715 ret = hsmp_create_attr_list(attr_grp, dev, sock_ind);716 if (ret)717 return ret;718 719 return devm_device_add_group(dev, attr_grp);720}721 722static int hsmp_cache_proto_ver(u16 sock_ind)723{724 struct hsmp_message msg = { 0 };725 int ret;726 727 msg.msg_id = HSMP_GET_PROTO_VER;728 msg.sock_ind = sock_ind;729 msg.response_sz = hsmp_msg_desc_table[HSMP_GET_PROTO_VER].response_sz;730 731 ret = hsmp_send_message(&msg);732 if (!ret)733 plat_dev.proto_ver = msg.args[0];734 735 return ret;736}737 738static inline bool is_f1a_m0h(void)739{740 if (boot_cpu_data.x86 == 0x1A && boot_cpu_data.x86_model <= 0x0F)741 return true;742 743 return false;744}745 746static int init_platform_device(struct device *dev)747{748 struct hsmp_socket *sock;749 int ret, i;750 751 for (i = 0; i < plat_dev.num_sockets; i++) {752 if (!node_to_amd_nb(i))753 return -ENODEV;754 sock = &plat_dev.sock[i];755 sock->root = node_to_amd_nb(i)->root;756 sock->sock_ind = i;757 sock->dev = dev;758 sock->mbinfo.base_addr = SMN_HSMP_BASE;759 760 /*761 * This is a transitional change from non-ACPI to ACPI, only762 * family 0x1A, model 0x00 platform is supported for both ACPI and non-ACPI.763 */764 if (is_f1a_m0h())765 sock->mbinfo.msg_id_off = SMN_HSMP_MSG_ID_F1A_M0H;766 else767 sock->mbinfo.msg_id_off = SMN_HSMP_MSG_ID;768 769 sock->mbinfo.msg_resp_off = SMN_HSMP_MSG_RESP;770 sock->mbinfo.msg_arg_off = SMN_HSMP_MSG_DATA;771 sema_init(&sock->hsmp_sem, 1);772 773 /* Test the hsmp interface on each socket */774 ret = hsmp_test(i, 0xDEADBEEF);775 if (ret) {776 dev_err(dev, "HSMP test message failed on Fam:%x model:%x\n",777 boot_cpu_data.x86, boot_cpu_data.x86_model);778 dev_err(dev, "Is HSMP disabled in BIOS ?\n");779 return ret;780 }781 }782 783 return 0;784}785 786static const struct acpi_device_id amd_hsmp_acpi_ids[] = {787 {ACPI_HSMP_DEVICE_HID, 0},788 {}789};790MODULE_DEVICE_TABLE(acpi, amd_hsmp_acpi_ids);791 792static int hsmp_pltdrv_probe(struct platform_device *pdev)793{794 struct acpi_device *adev;795 u16 sock_ind = 0;796 int ret;797 798 /*799 * On ACPI supported BIOS, there is an ACPI HSMP device added for800 * each socket, so the per socket probing, but the memory allocated for801 * sockets should be contiguous to access it as an array,802 * Hence allocate memory for all the sockets at once instead of allocating803 * on each probe.804 */805 if (!plat_dev.is_probed) {806 plat_dev.sock = devm_kcalloc(&pdev->dev, plat_dev.num_sockets,807 sizeof(*plat_dev.sock),808 GFP_KERNEL);809 if (!plat_dev.sock)810 return -ENOMEM;811 }812 adev = ACPI_COMPANION(&pdev->dev);813 if (adev && !acpi_match_device_ids(adev, amd_hsmp_acpi_ids)) {814 ret = hsmp_get_uid(&pdev->dev, &sock_ind);815 if (ret)816 return ret;817 if (sock_ind >= plat_dev.num_sockets)818 return -EINVAL;819 ret = hsmp_parse_acpi_table(&pdev->dev, sock_ind);820 if (ret) {821 dev_err(&pdev->dev, "Failed to parse ACPI table\n");822 return ret;823 }824 /* Test the hsmp interface */825 ret = hsmp_test(sock_ind, 0xDEADBEEF);826 if (ret) {827 dev_err(&pdev->dev, "HSMP test message failed on Fam:%x model:%x\n",828 boot_cpu_data.x86, boot_cpu_data.x86_model);829 dev_err(&pdev->dev, "Is HSMP disabled in BIOS ?\n");830 return ret;831 }832 } else {833 ret = init_platform_device(&pdev->dev);834 if (ret) {835 dev_err(&pdev->dev, "Failed to init HSMP mailbox\n");836 return ret;837 }838 }839 840 ret = hsmp_cache_proto_ver(sock_ind);841 if (ret) {842 dev_err(&pdev->dev, "Failed to read HSMP protocol version\n");843 return ret;844 }845 846 if (plat_dev.is_acpi_device)847 ret = hsmp_create_acpi_sysfs_if(&pdev->dev);848 else849 ret = hsmp_create_non_acpi_sysfs_if(&pdev->dev);850 if (ret)851 dev_err(&pdev->dev, "Failed to create HSMP sysfs interface\n");852 853 if (!plat_dev.is_probed) {854 plat_dev.hsmp_device.name = HSMP_CDEV_NAME;855 plat_dev.hsmp_device.minor = MISC_DYNAMIC_MINOR;856 plat_dev.hsmp_device.fops = &hsmp_fops;857 plat_dev.hsmp_device.parent = &pdev->dev;858 plat_dev.hsmp_device.nodename = HSMP_DEVNODE_NAME;859 plat_dev.hsmp_device.mode = 0644;860 861 ret = misc_register(&plat_dev.hsmp_device);862 if (ret)863 return ret;864 865 plat_dev.is_probed = true;866 }867 868 return 0;869 870}871 872static void hsmp_pltdrv_remove(struct platform_device *pdev)873{874 /*875 * We register only one misc_device even on multi socket system.876 * So, deregister should happen only once.877 */878 if (plat_dev.is_probed) {879 misc_deregister(&plat_dev.hsmp_device);880 plat_dev.is_probed = false;881 }882}883 884static struct platform_driver amd_hsmp_driver = {885 .probe = hsmp_pltdrv_probe,886 .remove_new = hsmp_pltdrv_remove,887 .driver = {888 .name = DRIVER_NAME,889 .acpi_match_table = amd_hsmp_acpi_ids,890 },891};892 893static struct platform_device *amd_hsmp_platdev;894 895static int hsmp_plat_dev_register(void)896{897 int ret;898 899 amd_hsmp_platdev = platform_device_alloc(DRIVER_NAME, PLATFORM_DEVID_NONE);900 if (!amd_hsmp_platdev)901 return -ENOMEM;902 903 ret = platform_device_add(amd_hsmp_platdev);904 if (ret)905 platform_device_put(amd_hsmp_platdev);906 907 return ret;908}909 910/*911 * This check is only needed for backward compatibility of previous platforms.912 * All new platforms are expected to support ACPI based probing.913 */914static bool legacy_hsmp_support(void)915{916 if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)917 return false;918 919 switch (boot_cpu_data.x86) {920 case 0x19:921 switch (boot_cpu_data.x86_model) {922 case 0x00 ... 0x1F:923 case 0x30 ... 0x3F:924 case 0x90 ... 0x9F:925 case 0xA0 ... 0xAF:926 return true;927 default:928 return false;929 }930 case 0x1A:931 switch (boot_cpu_data.x86_model) {932 case 0x00 ... 0x1F:933 return true;934 default:935 return false;936 }937 default:938 return false;939 }940 941 return false;942}943 944static int __init hsmp_plt_init(void)945{946 int ret = -ENODEV;947 948 /*949 * amd_nb_num() returns number of SMN/DF interfaces present in the system950 * if we have N SMN/DF interfaces that ideally means N sockets951 */952 plat_dev.num_sockets = amd_nb_num();953 if (plat_dev.num_sockets == 0 || plat_dev.num_sockets > MAX_AMD_SOCKETS)954 return ret;955 956 ret = platform_driver_register(&amd_hsmp_driver);957 if (ret)958 return ret;959 960 if (!plat_dev.is_acpi_device) {961 if (legacy_hsmp_support()) {962 /* Not ACPI device, but supports HSMP, register a plat_dev */963 ret = hsmp_plat_dev_register();964 } else {965 /* Not ACPI, Does not support HSMP */966 pr_info("HSMP is not supported on Family:%x model:%x\n",967 boot_cpu_data.x86, boot_cpu_data.x86_model);968 ret = -ENODEV;969 }970 if (ret)971 platform_driver_unregister(&amd_hsmp_driver);972 }973 974 return ret;975}976 977static void __exit hsmp_plt_exit(void)978{979 platform_device_unregister(amd_hsmp_platdev);980 platform_driver_unregister(&amd_hsmp_driver);981}982 983device_initcall(hsmp_plt_init);984module_exit(hsmp_plt_exit);985 986MODULE_DESCRIPTION("AMD HSMP Platform Interface Driver");987MODULE_VERSION(DRIVER_VERSION);988MODULE_LICENSE("GPL v2");989