1 files changed, 0 insertions, 608 deletions

diff --git a/drivers/platform/x86/amd/hsmp.c b/drivers/platform/x86/amd/hsmp.c
deleted file mode 100644
index b55d80e29139..000000000000
--- a/drivers/platform/x86/amd/hsmp.c
+++ /dev/null
@@ -1,608 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * AMD HSMP Platform Driver
- * Copyright (c) 2022, AMD.
- * All Rights Reserved.
- *
- * This file provides a device implementation for HSMP interface
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <asm/amd_hsmp.h>
-#include <asm/amd_nb.h>
-#include <linux/delay.h>
-#include <linux/io.h>
-#include <linux/miscdevice.h>
-#include <linux/module.h>
-#include <linux/pci.h>
-#include <linux/platform_device.h>
-#include <linux/semaphore.h>
-
-#define DRIVER_NAME		"amd_hsmp"
-#define DRIVER_VERSION		"2.0"
-
-/* HSMP Status / Error codes */
-#define HSMP_STATUS_NOT_READY	0x00
-#define HSMP_STATUS_OK		0x01
-#define HSMP_ERR_INVALID_MSG	0xFE
-#define HSMP_ERR_INVALID_INPUT	0xFF
-
-/* Timeout in millsec */
-#define HSMP_MSG_TIMEOUT	100
-#define HSMP_SHORT_SLEEP	1
-
-#define HSMP_WR			true
-#define HSMP_RD			false
-
-/*
- * To access specific HSMP mailbox register, s/w writes the SMN address of HSMP mailbox
- * register into the SMN_INDEX register, and reads/writes the SMN_DATA reg.
- * Below are required SMN address for HSMP Mailbox register offsets in SMU address space
- */
-#define SMN_HSMP_MSG_ID		0x3B10534
-#define SMN_HSMP_MSG_RESP	0x3B10980
-#define SMN_HSMP_MSG_DATA	0x3B109E0
-
-#define HSMP_INDEX_REG		0xc4
-#define HSMP_DATA_REG		0xc8
-
-#define HSMP_CDEV_NAME		"hsmp_cdev"
-#define HSMP_DEVNODE_NAME	"hsmp"
-#define HSMP_METRICS_TABLE_NAME	"metrics_bin"
-
-#define HSMP_ATTR_GRP_NAME_SIZE	10
-
-struct hsmp_socket {
-	struct bin_attribute hsmp_attr;
-	void __iomem *metric_tbl_addr;
-	struct semaphore hsmp_sem;
-	char name[HSMP_ATTR_GRP_NAME_SIZE];
-	u16 sock_ind;
-};
-
-struct hsmp_plat_device {
-	struct miscdevice hsmp_device;
-	struct hsmp_socket *sock;
-	struct device *dev;
-	u32 proto_ver;
-	u16 num_sockets;
-};
-
-static struct hsmp_plat_device plat_dev;
-
-static int amd_hsmp_rdwr(struct pci_dev *root, u32 address,
-			 u32 *value, bool write)
-{
-	int ret;
-
-	ret = pci_write_config_dword(root, HSMP_INDEX_REG, address);
-	if (ret)
-		return ret;
-
-	ret = (write ? pci_write_config_dword(root, HSMP_DATA_REG, *value)
-		     : pci_read_config_dword(root, HSMP_DATA_REG, value));
-
-	return ret;
-}
-
-/*
- * Send a message to the HSMP port via PCI-e config space registers.
- *
- * The caller is expected to zero out any unused arguments.
- * If a response is expected, the number of response words should be greater than 0.
- *
- * Returns 0 for success and populates the requested number of arguments.
- * Returns a negative error code for failure.
- */
-static int __hsmp_send_message(struct pci_dev *root, struct hsmp_message *msg)
-{
-	unsigned long timeout, short_sleep;
-	u32 mbox_status;
-	u32 index;
-	int ret;
-
-	/* Clear the status register */
-	mbox_status = HSMP_STATUS_NOT_READY;
-	ret = amd_hsmp_rdwr(root, SMN_HSMP_MSG_RESP, &mbox_status, HSMP_WR);
-	if (ret) {
-		pr_err("Error %d clearing mailbox status register\n", ret);
-		return ret;
-	}
-
-	index = 0;
-	/* Write any message arguments */
-	while (index < msg->num_args) {
-		ret = amd_hsmp_rdwr(root, SMN_HSMP_MSG_DATA + (index << 2),
-				    &msg->args[index], HSMP_WR);
-		if (ret) {
-			pr_err("Error %d writing message argument %d\n", ret, index);
-			return ret;
-		}
-		index++;
-	}
-
-	/* Write the message ID which starts the operation */
-	ret = amd_hsmp_rdwr(root, SMN_HSMP_MSG_ID, &msg->msg_id, HSMP_WR);
-	if (ret) {
-		pr_err("Error %d writing message ID %u\n", ret, msg->msg_id);
-		return ret;
-	}
-
-	/*
-	 * Depending on when the trigger write completes relative to the SMU
-	 * firmware 1 ms cycle, the operation may take from tens of us to 1 ms
-	 * to complete. Some operations may take more. Therefore we will try
-	 * a few short duration sleeps and switch to long sleeps if we don't
-	 * succeed quickly.
-	 */
-	short_sleep = jiffies + msecs_to_jiffies(HSMP_SHORT_SLEEP);
-	timeout	= jiffies + msecs_to_jiffies(HSMP_MSG_TIMEOUT);
-
-	while (time_before(jiffies, timeout)) {
-		ret = amd_hsmp_rdwr(root, SMN_HSMP_MSG_RESP, &mbox_status, HSMP_RD);
-		if (ret) {
-			pr_err("Error %d reading mailbox status\n", ret);
-			return ret;
-		}
-
-		if (mbox_status != HSMP_STATUS_NOT_READY)
-			break;
-		if (time_before(jiffies, short_sleep))
-			usleep_range(50, 100);
-		else
-			usleep_range(1000, 2000);
-	}
-
-	if (unlikely(mbox_status == HSMP_STATUS_NOT_READY)) {
-		return -ETIMEDOUT;
-	} else if (unlikely(mbox_status == HSMP_ERR_INVALID_MSG)) {
-		return -ENOMSG;
-	} else if (unlikely(mbox_status == HSMP_ERR_INVALID_INPUT)) {
-		return -EINVAL;
-	} else if (unlikely(mbox_status != HSMP_STATUS_OK)) {
-		pr_err("Message ID %u unknown failure (status = 0x%X)\n",
-		       msg->msg_id, mbox_status);
-		return -EIO;
-	}
-
-	/*
-	 * SMU has responded OK. Read response data.
-	 * SMU reads the input arguments from eight 32 bit registers starting
-	 * from SMN_HSMP_MSG_DATA and writes the response data to the same
-	 * SMN_HSMP_MSG_DATA address.
-	 * We copy the response data if any, back to the args[].
-	 */
-	index = 0;
-	while (index < msg->response_sz) {
-		ret = amd_hsmp_rdwr(root, SMN_HSMP_MSG_DATA + (index << 2),
-				    &msg->args[index], HSMP_RD);
-		if (ret) {
-			pr_err("Error %d reading response %u for message ID:%u\n",
-			       ret, index, msg->msg_id);
-			break;
-		}
-		index++;
-	}
-
-	return ret;
-}
-
-static int validate_message(struct hsmp_message *msg)
-{
-	/* msg_id against valid range of message IDs */
-	if (msg->msg_id < HSMP_TEST || msg->msg_id >= HSMP_MSG_ID_MAX)
-		return -ENOMSG;
-
-	/* msg_id is a reserved message ID */
-	if (hsmp_msg_desc_table[msg->msg_id].type == HSMP_RSVD)
-		return -ENOMSG;
-
-	/* num_args and response_sz against the HSMP spec */
-	if (msg->num_args != hsmp_msg_desc_table[msg->msg_id].num_args ||
-	    msg->response_sz != hsmp_msg_desc_table[msg->msg_id].response_sz)
-		return -EINVAL;
-
-	return 0;
-}
-
-int hsmp_send_message(struct hsmp_message *msg)
-{
-	struct hsmp_socket *sock = &plat_dev.sock[msg->sock_ind];
-	struct amd_northbridge *nb;
-	int ret;
-
-	if (!msg)
-		return -EINVAL;
-
-	nb = node_to_amd_nb(msg->sock_ind);
-	if (!nb || !nb->root)
-		return -ENODEV;
-
-	ret = validate_message(msg);
-	if (ret)
-		return ret;
-
-	/*
-	 * The time taken by smu operation to complete is between
-	 * 10us to 1ms. Sometime it may take more time.
-	 * In SMP system timeout of 100 millisecs should
-	 * be enough for the previous thread to finish the operation
-	 */
-	ret = down_timeout(&sock->hsmp_sem, msecs_to_jiffies(HSMP_MSG_TIMEOUT));
-	if (ret < 0)
-		return ret;
-
-	ret = __hsmp_send_message(nb->root, msg);
-
-	up(&sock->hsmp_sem);
-
-	return ret;
-}
-EXPORT_SYMBOL_GPL(hsmp_send_message);
-
-static int hsmp_test(u16 sock_ind, u32 value)
-{
-	struct hsmp_message msg = { 0 };
-	struct amd_northbridge *nb;
-	int ret = -ENODEV;
-
-	nb = node_to_amd_nb(sock_ind);
-	if (!nb || !nb->root)
-		return ret;
-
-	/*
-	 * Test the hsmp port by performing TEST command. The test message
-	 * takes one argument and returns the value of that argument + 1.
-	 */
-	msg.msg_id	= HSMP_TEST;
-	msg.num_args	= 1;
-	msg.response_sz	= 1;
-	msg.args[0]	= value;
-	msg.sock_ind	= sock_ind;
-
-	ret = __hsmp_send_message(nb->root, &msg);
-	if (ret)
-		return ret;
-
-	/* Check the response value */
-	if (msg.args[0] != (value + 1)) {
-		pr_err("Socket %d test message failed, Expected 0x%08X, received 0x%08X\n",
-		       sock_ind, (value + 1), msg.args[0]);
-		return -EBADE;
-	}
-
-	return ret;
-}
-
-static long hsmp_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
-{
-	int __user *arguser = (int  __user *)arg;
-	struct hsmp_message msg = { 0 };
-	int ret;
-
-	if (copy_struct_from_user(&msg, sizeof(msg), arguser, sizeof(struct hsmp_message)))
-		return -EFAULT;
-
-	/*
-	 * Check msg_id is within the range of supported msg ids
-	 * i.e within the array bounds of hsmp_msg_desc_table
-	 */
-	if (msg.msg_id < HSMP_TEST || msg.msg_id >= HSMP_MSG_ID_MAX)
-		return -ENOMSG;
-
-	switch (fp->f_mode & (FMODE_WRITE | FMODE_READ)) {
-	case FMODE_WRITE:
-		/*
-		 * Device is opened in O_WRONLY mode
-		 * Execute only set/configure commands
-		 */
-		if (hsmp_msg_desc_table[msg.msg_id].type != HSMP_SET)
-			return -EINVAL;
-		break;
-	case FMODE_READ:
-		/*
-		 * Device is opened in O_RDONLY mode
-		 * Execute only get/monitor commands
-		 */
-		if (hsmp_msg_desc_table[msg.msg_id].type != HSMP_GET)
-			return -EINVAL;
-		break;
-	case FMODE_READ | FMODE_WRITE:
-		/*
-		 * Device is opened in O_RDWR mode
-		 * Execute both get/monitor and set/configure commands
-		 */
-		break;
-	default:
-		return -EINVAL;
-	}
-
-	ret = hsmp_send_message(&msg);
-	if (ret)
-		return ret;
-
-	if (hsmp_msg_desc_table[msg.msg_id].response_sz > 0) {
-		/* Copy results back to user for get/monitor commands */
-		if (copy_to_user(arguser, &msg, sizeof(struct hsmp_message)))
-			return -EFAULT;
-	}
-
-	return 0;
-}
-
-static const struct file_operations hsmp_fops = {
-	.owner		= THIS_MODULE,
-	.unlocked_ioctl	= hsmp_ioctl,
-	.compat_ioctl	= hsmp_ioctl,
-};
-
-static ssize_t hsmp_metric_tbl_read(struct file *filp, struct kobject *kobj,
-				    struct bin_attribute *bin_attr, char *buf,
-				    loff_t off, size_t count)
-{
-	struct hsmp_socket *sock = bin_attr->private;
-	struct hsmp_message msg = { 0 };
-	int ret;
-
-	/* Do not support lseek(), reads entire metric table */
-	if (count < bin_attr->size) {
-		dev_err(plat_dev.dev, "Wrong buffer size\n");
-		return -EINVAL;
-	}
-
-	if (!sock) {
-		dev_err(plat_dev.dev, "Failed to read attribute private data\n");
-		return -EINVAL;
-	}
-
-	msg.msg_id	= HSMP_GET_METRIC_TABLE;
-	msg.sock_ind	= sock->sock_ind;
-
-	ret = hsmp_send_message(&msg);
-	if (ret)
-		return ret;
-	memcpy_fromio(buf, sock->metric_tbl_addr, bin_attr->size);
-
-	return bin_attr->size;
-}
-
-static int hsmp_get_tbl_dram_base(u16 sock_ind)
-{
-	struct hsmp_socket *sock = &plat_dev.sock[sock_ind];
-	struct hsmp_message msg = { 0 };
-	phys_addr_t dram_addr;
-	int ret;
-
-	msg.sock_ind	= sock_ind;
-	msg.response_sz	= hsmp_msg_desc_table[HSMP_GET_METRIC_TABLE_DRAM_ADDR].response_sz;
-	msg.msg_id	= HSMP_GET_METRIC_TABLE_DRAM_ADDR;
-
-	ret = hsmp_send_message(&msg);
-	if (ret)
-		return ret;
-
-	/*
-	 * calculate the metric table DRAM address from lower and upper 32 bits
-	 * sent from SMU and ioremap it to virtual address.
-	 */
-	dram_addr = msg.args[0] | ((u64)(msg.args[1]) << 32);
-	if (!dram_addr) {
-		dev_err(plat_dev.dev, "Invalid DRAM address for metric table\n");
-		return -ENOMEM;
-	}
-	sock->metric_tbl_addr = devm_ioremap(plat_dev.dev, dram_addr,
-					     sizeof(struct hsmp_metric_table));
-	if (!sock->metric_tbl_addr) {
-		dev_err(plat_dev.dev, "Failed to ioremap metric table addr\n");
-		return -ENOMEM;
-	}
-	return 0;
-}
-
-static umode_t hsmp_is_sock_attr_visible(struct kobject *kobj,
-					 struct bin_attribute *battr, int id)
-{
-	if (plat_dev.proto_ver == HSMP_PROTO_VER6)
-		return battr->attr.mode;
-	else
-		return 0;
-}
-
-static int hsmp_init_metric_tbl_bin_attr(struct bin_attribute **hattrs, u16 sock_ind)
-{
-	struct bin_attribute *hattr = &plat_dev.sock[sock_ind].hsmp_attr;
-
-	sysfs_bin_attr_init(hattr);
-	hattr->attr.name	= HSMP_METRICS_TABLE_NAME;
-	hattr->attr.mode	= 0444;
-	hattr->read		= hsmp_metric_tbl_read;
-	hattr->size		= sizeof(struct hsmp_metric_table);
-	hattr->private		= &plat_dev.sock[sock_ind];
-	hattrs[0]		= hattr;
-
-	if (plat_dev.proto_ver == HSMP_PROTO_VER6)
-		return (hsmp_get_tbl_dram_base(sock_ind));
-	else
-		return 0;
-}
-
-/* One bin sysfs for metrics table*/
-#define NUM_HSMP_ATTRS		1
-
-static int hsmp_create_sysfs_interface(void)
-{
-	const struct attribute_group **hsmp_attr_grps;
-	struct bin_attribute **hsmp_bin_attrs;
-	struct attribute_group *attr_grp;
-	int ret;
-	u16 i;
-
-	/* String formatting is currently limited to u8 sockets */
-	if (WARN_ON(plat_dev.num_sockets > U8_MAX))
-		return -ERANGE;
-
-	hsmp_attr_grps = devm_kzalloc(plat_dev.dev, sizeof(struct attribute_group *) *
-				      (plat_dev.num_sockets + 1), GFP_KERNEL);
-	if (!hsmp_attr_grps)
-		return -ENOMEM;
-
-	/* Create a sysfs directory for each socket */
-	for (i = 0; i < plat_dev.num_sockets; i++) {
-		attr_grp = devm_kzalloc(plat_dev.dev, sizeof(struct attribute_group), GFP_KERNEL);
-		if (!attr_grp)
-			return -ENOMEM;
-
-		snprintf(plat_dev.sock[i].name, HSMP_ATTR_GRP_NAME_SIZE, "socket%u", (u8)i);
-		attr_grp->name = plat_dev.sock[i].name;
-
-		/* Null terminated list of attributes */
-		hsmp_bin_attrs = devm_kzalloc(plat_dev.dev, sizeof(struct bin_attribute *) *
-					      (NUM_HSMP_ATTRS + 1), GFP_KERNEL);
-		if (!hsmp_bin_attrs)
-			return -ENOMEM;
-
-		attr_grp->bin_attrs		= hsmp_bin_attrs;
-		attr_grp->is_bin_visible	= hsmp_is_sock_attr_visible;
-		hsmp_attr_grps[i]		= attr_grp;
-
-		/* Now create the leaf nodes */
-		ret = hsmp_init_metric_tbl_bin_attr(hsmp_bin_attrs, i);
-		if (ret)
-			return ret;
-	}
-	return devm_device_add_groups(plat_dev.dev, hsmp_attr_grps);
-}
-
-static int hsmp_cache_proto_ver(void)
-{
-	struct hsmp_message msg = { 0 };
-	int ret;
-
-	msg.msg_id	= HSMP_GET_PROTO_VER;
-	msg.sock_ind	= 0;
-	msg.response_sz = hsmp_msg_desc_table[HSMP_GET_PROTO_VER].response_sz;
-
-	ret = hsmp_send_message(&msg);
-	if (!ret)
-		plat_dev.proto_ver = msg.args[0];
-
-	return ret;
-}
-
-static int hsmp_pltdrv_probe(struct platform_device *pdev)
-{
-	int ret, i;
-
-	plat_dev.sock = devm_kzalloc(&pdev->dev,
-				     (plat_dev.num_sockets * sizeof(struct hsmp_socket)),
-				     GFP_KERNEL);
-	if (!plat_dev.sock)
-		return -ENOMEM;
-	plat_dev.dev = &pdev->dev;
-
-	for (i = 0; i < plat_dev.num_sockets; i++) {
-		sema_init(&plat_dev.sock[i].hsmp_sem, 1);
-		plat_dev.sock[i].sock_ind = i;
-	}
-
-	plat_dev.hsmp_device.name	= HSMP_CDEV_NAME;
-	plat_dev.hsmp_device.minor	= MISC_DYNAMIC_MINOR;
-	plat_dev.hsmp_device.fops	= &hsmp_fops;
-	plat_dev.hsmp_device.parent	= &pdev->dev;
-	plat_dev.hsmp_device.nodename	= HSMP_DEVNODE_NAME;
-	plat_dev.hsmp_device.mode	= 0644;
-
-	ret = hsmp_cache_proto_ver();
-	if (ret) {
-		dev_err(plat_dev.dev, "Failed to read HSMP protocol version\n");
-		return ret;
-	}
-
-	ret = hsmp_create_sysfs_interface();
-	if (ret)
-		dev_err(plat_dev.dev, "Failed to create HSMP sysfs interface\n");
-
-	return misc_register(&plat_dev.hsmp_device);
-}
-
-static void hsmp_pltdrv_remove(struct platform_device *pdev)
-{
-	misc_deregister(&plat_dev.hsmp_device);
-}
-
-static struct platform_driver amd_hsmp_driver = {
-	.probe		= hsmp_pltdrv_probe,
-	.remove_new	= hsmp_pltdrv_remove,
-	.driver		= {
-		.name	= DRIVER_NAME,
-	},
-};
-
-static struct platform_device *amd_hsmp_platdev;
-
-static int __init hsmp_plt_init(void)
-{
-	int ret = -ENODEV;
-	int i;
-
-	if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD || boot_cpu_data.x86 < 0x19) {
-		pr_err("HSMP is not supported on Family:%x model:%x\n",
-		       boot_cpu_data.x86, boot_cpu_data.x86_model);
-		return ret;
-	}
-
-	/*
-	 * amd_nb_num() returns number of SMN/DF interfaces present in the system
-	 * if we have N SMN/DF interfaces that ideally means N sockets
-	 */
-	plat_dev.num_sockets = amd_nb_num();
-	if (plat_dev.num_sockets == 0)
-		return ret;
-
-	/* Test the hsmp interface on each socket */
-	for (i = 0; i < plat_dev.num_sockets; i++) {
-		ret = hsmp_test(i, 0xDEADBEEF);
-		if (ret) {
-			pr_err("HSMP test message failed on Fam:%x model:%x\n",
-			       boot_cpu_data.x86, boot_cpu_data.x86_model);
-			pr_err("Is HSMP disabled in BIOS ?\n");
-			return ret;
-		}
-	}
-
-	ret = platform_driver_register(&amd_hsmp_driver);
-	if (ret)
-		return ret;
-
-	amd_hsmp_platdev = platform_device_alloc(DRIVER_NAME, PLATFORM_DEVID_NONE);
-	if (!amd_hsmp_platdev) {
-		ret = -ENOMEM;
-		goto drv_unregister;
-	}
-
-	ret = platform_device_add(amd_hsmp_platdev);
-	if (ret) {
-		platform_device_put(amd_hsmp_platdev);
-		goto drv_unregister;
-	}
-
-	return 0;
-
-drv_unregister:
-	platform_driver_unregister(&amd_hsmp_driver);
-	return ret;
-}
-
-static void __exit hsmp_plt_exit(void)
-{
-	platform_device_unregister(amd_hsmp_platdev);
-	platform_driver_unregister(&amd_hsmp_driver);
-}
-
-device_initcall(hsmp_plt_init);
-module_exit(hsmp_plt_exit);
-
-MODULE_DESCRIPTION("AMD HSMP Platform Interface Driver");
-MODULE_VERSION(DRIVER_VERSION);
-MODULE_LICENSE("GPL v2");