@@ -5,7 +5,7 @@
#include <uapi/asm/amd_hsmp.h>
-#if IS_ENABLED(CONFIG_AMD_HSMP)
+#if IS_ENABLED(CONFIG_AMD_HSMP) || IS_ENABLED(CONFIG_AMD_HSMP_ACPI)
int hsmp_send_message(struct hsmp_message *msg);
#else
static inline int hsmp_send_message(struct hsmp_message *msg)
@@ -3,9 +3,30 @@
# AMD HSMP Driver
#
+menu "AMD Host System Management Port driver"
+ depends on AMD_NB
+
+config AMD_HSMP_ACPI
+ tristate "AMD HSMP ACPI driver"
+ depends on ACPI
+ help
+ The driver provides a way for user space tools to monitor and manage
+ system management functionality on EPYC server CPUs from AMD.
+
+ Host System Management Port (HSMP) interface is a mailbox interface
+ between the x86 core and the System Management Unit (SMU) firmware.
+
+ This driver supports ACPI based probing.
+
+ You may enable this, if your platform bios provides an ACPI object
+ as described in the documentation.
+
+ If you choose to compile this driver as a module the module will be
+ called amd_hsmp.
+
config AMD_HSMP
tristate "AMD HSMP Driver"
- depends on AMD_NB && X86_64 && ACPI
+ depends on AMD_HSMP_ACPI=n
help
The driver provides a way for user space tools to monitor and manage
system management functionality on EPYC server CPUs from AMD.
@@ -15,3 +36,5 @@ config AMD_HSMP
If you choose to compile this driver as a module the module will be
called amd_hsmp.
+
+endmenu
@@ -4,5 +4,11 @@
# AMD HSMP Driver
#
-obj-$(CONFIG_AMD_HSMP) += amd_hsmp.o
-amd_hsmp-objs := hsmp.o plat.o acpi.o
+ifneq ($(CONFIG_AMD_HSMP), )
+obj-$(CONFIG_AMD_HSMP) += amd_hsmp.o
+amd_hsmp-objs = hsmp.o plat.o
+endif
+ifneq ($(CONFIG_AMD_HSMP_ACPI), )
+obj-$(CONFIG_AMD_HSMP_ACPI) += amd_hsmp.o
+amd_hsmp-objs = hsmp.o acpi.o
+endif
@@ -11,29 +11,43 @@
#include "hsmp.h"
+#include <asm/amd_nb.h>
+
#include <linux/acpi.h>
#include <linux/device.h>
#include <linux/dev_printk.h>
#include <linux/ioport.h>
#include <linux/kstrtox.h>
+#include <linux/platform_device.h>
#include <linux/uuid.h>
#include <uapi/asm-generic/errno-base.h>
+#define DRIVER_NAME "amd_hsmp"
+#define DRIVER_VERSION "2.3"
+#define ACPI_HSMP_DEVICE_HID "AMDI0097"
+
/* These are the strings specified in ACPI table */
#define MSG_IDOFF_STR "MsgIdOffset"
#define MSG_ARGOFF_STR "MsgArgOffset"
#define MSG_RESPOFF_STR "MsgRspOffset"
-void amd_hsmp_acpi_rdwr(struct hsmp_socket *sock, u32 offset,
- u32 *value, bool write)
+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;
}
+static const struct file_operations hsmp_fops = {
+ .owner = THIS_MODULE,
+ .unlocked_ioctl = hsmp_ioctl,
+ .compat_ioctl = hsmp_ioctl,
+};
+
/* This is the UUID used for HSMP */
static const guid_t acpi_hsmp_uuid = GUID_INIT(0xb74d619d, 0x5707, 0x48bd,
0xa6, 0x9f, 0x4e, 0xa2,
@@ -194,9 +208,9 @@ 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;
- hsmp_pdev.is_acpi_device = true;
+ sock->sock_ind = sock_ind;
+ sock->dev = dev;
+ sock->amd_hsmp_rdwr = amd_hsmp_acpi_rdwr;
sema_init(&sock->hsmp_sem, 1);
@@ -209,7 +223,7 @@ static int hsmp_parse_acpi_table(struct device *dev, u16 sock_ind)
return hsmp_read_acpi_dsd(sock);
}
-int hsmp_create_acpi_sysfs_if(struct device *dev)
+static int hsmp_create_acpi_sysfs_if(struct device *dev)
{
struct attribute_group *attr_grp;
u16 sock_ind;
@@ -232,7 +246,7 @@ int hsmp_create_acpi_sysfs_if(struct device *dev)
return devm_device_add_group(dev, attr_grp);
}
-int init_acpi(struct device *dev)
+static int init_acpi(struct device *dev)
{
u16 sock_ind;
int ret;
@@ -266,3 +280,94 @@ int init_acpi(struct device *dev)
return ret;
}
+
+static const struct acpi_device_id amd_hsmp_acpi_ids[] = {
+ {ACPI_HSMP_DEVICE_HID, 0},
+ {}
+};
+MODULE_DEVICE_TABLE(acpi, amd_hsmp_acpi_ids);
+
+static bool check_acpi_support(struct device *dev)
+{
+ struct acpi_device *adev = ACPI_COMPANION(dev);
+
+ if (adev && !acpi_match_device_ids(adev, amd_hsmp_acpi_ids))
+ return true;
+
+ return false;
+}
+
+static int hsmp_acpi_probe(struct platform_device *pdev)
+{
+ int ret;
+
+ if (!hsmp_pdev.is_probed) {
+ hsmp_pdev.num_sockets = amd_nb_num();
+ if (hsmp_pdev.num_sockets == 0 || hsmp_pdev.num_sockets > MAX_AMD_SOCKETS)
+ 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;
+ }
+
+ if (!check_acpi_support(&pdev->dev)) {
+ dev_err(&pdev->dev, "Not ACPI device?\n");
+ return -ENODEV;
+ }
+
+ ret = init_acpi(&pdev->dev);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to initialize HSMP interface.\n");
+ return ret;
+ }
+
+ ret = hsmp_create_acpi_sysfs_if(&pdev->dev);
+ if (ret)
+ dev_err(&pdev->dev, "Failed to create HSMP sysfs interface\n");
+
+ if (!hsmp_pdev.is_probed) {
+ hsmp_pdev.mdev.name = HSMP_CDEV_NAME;
+ hsmp_pdev.mdev.minor = MISC_DYNAMIC_MINOR;
+ hsmp_pdev.mdev.fops = &hsmp_fops;
+ hsmp_pdev.mdev.parent = &pdev->dev;
+ hsmp_pdev.mdev.nodename = HSMP_DEVNODE_NAME;
+ hsmp_pdev.mdev.mode = 0644;
+
+ ret = misc_register(&hsmp_pdev.mdev);
+ 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) {
+ misc_deregister(&hsmp_pdev.mdev);
+ hsmp_pdev.is_probed = false;
+ }
+}
+
+static struct platform_driver amd_hsmp_driver = {
+ .probe = hsmp_acpi_probe,
+ .remove_new = hsmp_acpi_remove,
+ .driver = {
+ .name = DRIVER_NAME,
+ .acpi_match_table = amd_hsmp_acpi_ids,
+ },
+};
+
+module_platform_driver(amd_hsmp_driver);
+
+MODULE_DESCRIPTION("AMD HSMP Platform Interface Driver");
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL v2");
@@ -31,17 +31,6 @@
struct hsmp_plat_device hsmp_pdev;
-static int amd_hsmp_rdwr(struct hsmp_socket *sock, u32 offset,
- u32 *value, bool write)
-{
- if (hsmp_pdev.is_acpi_device)
- amd_hsmp_acpi_rdwr(sock, offset, value, write);
- else
- return amd_hsmp_pci_rdwr(sock, offset, value, write);
-
- return 0;
-}
-
/*
* Send a message to the HSMP port via PCI-e config space registers
* or by writing to MMIO space.
@@ -64,7 +53,7 @@ static int __hsmp_send_message(struct hsmp_socket *sock, struct hsmp_message *ms
/* Clear the status register */
mbox_status = HSMP_STATUS_NOT_READY;
- ret = amd_hsmp_rdwr(sock, mbinfo->msg_resp_off, &mbox_status, HSMP_WR);
+ ret = sock->amd_hsmp_rdwr(sock, mbinfo->msg_resp_off, &mbox_status, HSMP_WR);
if (ret) {
pr_err("Error %d clearing mailbox status register\n", ret);
return ret;
@@ -73,8 +62,8 @@ static int __hsmp_send_message(struct hsmp_socket *sock, struct hsmp_message *ms
index = 0;
/* Write any message arguments */
while (index < msg->num_args) {
- ret = amd_hsmp_rdwr(sock, mbinfo->msg_arg_off + (index << 2),
- &msg->args[index], HSMP_WR);
+ ret = sock->amd_hsmp_rdwr(sock, mbinfo->msg_arg_off + (index << 2),
+ &msg->args[index], HSMP_WR);
if (ret) {
pr_err("Error %d writing message argument %d\n", ret, index);
return ret;
@@ -83,7 +72,7 @@ static int __hsmp_send_message(struct hsmp_socket *sock, struct hsmp_message *ms
}
/* Write the message ID which starts the operation */
- ret = amd_hsmp_rdwr(sock, mbinfo->msg_id_off, &msg->msg_id, HSMP_WR);
+ ret = sock->amd_hsmp_rdwr(sock, mbinfo->msg_id_off, &msg->msg_id, HSMP_WR);
if (ret) {
pr_err("Error %d writing message ID %u\n", ret, msg->msg_id);
return ret;
@@ -100,7 +89,7 @@ static int __hsmp_send_message(struct hsmp_socket *sock, struct hsmp_message *ms
timeout = jiffies + msecs_to_jiffies(HSMP_MSG_TIMEOUT);
while (time_before(jiffies, timeout)) {
- ret = amd_hsmp_rdwr(sock, mbinfo->msg_resp_off, &mbox_status, HSMP_RD);
+ ret = sock->amd_hsmp_rdwr(sock, mbinfo->msg_resp_off, &mbox_status, HSMP_RD);
if (ret) {
pr_err("Error %d reading mailbox status\n", ret);
return ret;
@@ -135,8 +124,8 @@ static int __hsmp_send_message(struct hsmp_socket *sock, struct hsmp_message *ms
*/
index = 0;
while (index < msg->response_sz) {
- ret = amd_hsmp_rdwr(sock, mbinfo->msg_arg_off + (index << 2),
- &msg->args[index], HSMP_RD);
+ ret = sock->amd_hsmp_rdwr(sock, mbinfo->msg_arg_off + (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);
@@ -41,6 +41,7 @@ struct hsmp_socket {
struct pci_dev *root;
struct device *dev;
u16 sock_ind;
+ int (*amd_hsmp_rdwr)(struct hsmp_socket *sock, u32 off, u32 *val, bool rw);
};
struct hsmp_plat_device {
@@ -48,19 +49,14 @@ struct hsmp_plat_device {
struct hsmp_socket *sock;
u32 proto_ver;
u16 num_sockets;
- bool is_acpi_device;
bool is_probed;
};
extern struct hsmp_plat_device hsmp_pdev;
-int init_acpi(struct device *dev);
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);
-int hsmp_create_acpi_sysfs_if(struct device *dev);
-int amd_hsmp_pci_rdwr(struct hsmp_socket *sock, u32 offset,
- u32 *value, bool write);
int hsmp_cache_proto_ver(u16 sock_ind);
long hsmp_ioctl(struct file *fp, unsigned int cmd, unsigned long arg);
umode_t hsmp_is_sock_attr_visible(struct kobject *kobj,
@@ -68,6 +64,4 @@ umode_t hsmp_is_sock_attr_visible(struct kobject *kobj,
int hsmp_create_attr_list(struct attribute_group *attr_grp,
struct device *dev, u16 sock_ind);
int hsmp_test(u16 sock_ind, u32 value);
-void amd_hsmp_acpi_rdwr(struct hsmp_socket *sock, u32 offset,
- u32 *value, bool write);
#endif /* HSMP_H */
@@ -13,15 +13,13 @@
#include <asm/amd_nb.h>
-#include <linux/acpi.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#define DRIVER_NAME "amd_hsmp"
-#define DRIVER_VERSION "2.2"
-#define ACPI_HSMP_DEVICE_HID "AMDI0097"
+#define DRIVER_VERSION "2.3"
/*
* To access specific HSMP mailbox register, s/w writes the SMN address of HSMP mailbox
@@ -37,8 +35,8 @@
#define HSMP_INDEX_REG 0xc4
#define HSMP_DATA_REG 0xc8
-int amd_hsmp_pci_rdwr(struct hsmp_socket *sock, u32 offset,
- u32 *value, bool write)
+static int amd_hsmp_pci_rdwr(struct hsmp_socket *sock, u32 offset,
+ u32 *value, bool write)
{
int ret;
@@ -113,6 +111,7 @@ static int init_platform_device(struct device *dev)
sock->sock_ind = i;
sock->dev = dev;
sock->mbinfo.base_addr = SMN_HSMP_BASE;
+ sock->amd_hsmp_rdwr = amd_hsmp_pci_rdwr;
/*
* This is a transitional change from non-ACPI to ACPI, only
@@ -146,89 +145,39 @@ static int init_platform_device(struct device *dev)
return 0;
}
-static const struct acpi_device_id amd_hsmp_acpi_ids[] = {
- {ACPI_HSMP_DEVICE_HID, 0},
- {}
-};
-MODULE_DEVICE_TABLE(acpi, amd_hsmp_acpi_ids);
-
-static bool check_acpi_support(struct device *dev)
-{
- struct acpi_device *adev = ACPI_COMPANION(dev);
-
- if (adev && !acpi_match_device_ids(adev, amd_hsmp_acpi_ids))
- return true;
-
- return false;
-}
-
static int hsmp_pltdrv_probe(struct platform_device *pdev)
{
int ret;
- /*
- * On ACPI supported BIOS, there is an ACPI HSMP device added for
- * each socket, so the per socket probing, but the memory allocated for
- * sockets should be contiguous to access it as an array,
- * Hence allocate memory for all the sockets at once instead of allocating
- * on each probe.
- */
- if (!hsmp_pdev.is_probed) {
- hsmp_pdev.sock = devm_kcalloc(&pdev->dev, hsmp_pdev.num_sockets,
- sizeof(*hsmp_pdev.sock),
- GFP_KERNEL);
- if (!hsmp_pdev.sock)
- return -ENOMEM;
- }
+ hsmp_pdev.sock = devm_kcalloc(&pdev->dev, hsmp_pdev.num_sockets,
+ sizeof(*hsmp_pdev.sock),
+ GFP_KERNEL);
+ if (!hsmp_pdev.sock)
+ return -ENOMEM;
- if (check_acpi_support(&pdev->dev)) {
- ret = init_acpi(&pdev->dev);
- if (ret) {
- dev_err(&pdev->dev, "Failed to init HSMP mailbox\n");
- return ret;
- }
- ret = hsmp_create_acpi_sysfs_if(&pdev->dev);
- if (ret)
- dev_err(&pdev->dev, "Failed to create HSMP sysfs interface\n");
- } else {
- ret = init_platform_device(&pdev->dev);
- if (ret) {
- dev_err(&pdev->dev, "Failed to init HSMP mailbox\n");
- return ret;
- }
- ret = hsmp_create_non_acpi_sysfs_if(&pdev->dev);
- if (ret)
- dev_err(&pdev->dev, "Failed to create HSMP sysfs interface\n");
+ ret = init_platform_device(&pdev->dev);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to init HSMP mailbox\n");
+ return ret;
}
- if (!hsmp_pdev.is_probed) {
- hsmp_pdev.mdev.name = HSMP_CDEV_NAME;
- hsmp_pdev.mdev.minor = MISC_DYNAMIC_MINOR;
- hsmp_pdev.mdev.fops = &hsmp_fops;
- hsmp_pdev.mdev.parent = &pdev->dev;
- hsmp_pdev.mdev.nodename = HSMP_DEVNODE_NAME;
- hsmp_pdev.mdev.mode = 0644;
-
- ret = misc_register(&hsmp_pdev.mdev);
- if (ret)
- return ret;
+ ret = hsmp_create_non_acpi_sysfs_if(&pdev->dev);
+ if (ret)
+ dev_err(&pdev->dev, "Failed to create HSMP sysfs interface\n");
- hsmp_pdev.is_probed = true;
- }
+ hsmp_pdev.mdev.name = HSMP_CDEV_NAME;
+ hsmp_pdev.mdev.minor = MISC_DYNAMIC_MINOR;
+ hsmp_pdev.mdev.fops = &hsmp_fops;
+ hsmp_pdev.mdev.parent = &pdev->dev;
+ hsmp_pdev.mdev.nodename = HSMP_DEVNODE_NAME;
+ hsmp_pdev.mdev.mode = 0644;
- return 0;
+ return misc_register(&hsmp_pdev.mdev);
}
static void hsmp_pltdrv_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) {
- misc_deregister(&hsmp_pdev.mdev);
- hsmp_pdev.is_probed = false;
- }
+ misc_deregister(&hsmp_pdev.mdev);
}
static struct platform_driver amd_hsmp_driver = {
@@ -236,7 +185,6 @@ static struct platform_driver amd_hsmp_driver = {
.remove_new = hsmp_pltdrv_remove,
.driver = {
.name = DRIVER_NAME,
- .acpi_match_table = amd_hsmp_acpi_ids,
},
};
@@ -295,6 +243,12 @@ static int __init hsmp_plt_init(void)
{
int ret = -ENODEV;
+ if (!legacy_hsmp_support()) {
+ pr_info("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
@@ -307,19 +261,9 @@ static int __init hsmp_plt_init(void)
if (ret)
return ret;
- if (!hsmp_pdev.is_acpi_device) {
- if (legacy_hsmp_support()) {
- /* Not ACPI device, but supports HSMP, register a plat_dev */
- ret = hsmp_plat_dev_register();
- } else {
- /* Not ACPI, Does not support HSMP */
- pr_info("HSMP is not supported on Family:%x model:%x\n",
- boot_cpu_data.x86, boot_cpu_data.x86_model);
- ret = -ENODEV;
- }
- if (ret)
- platform_driver_unregister(&amd_hsmp_driver);
- }
+ ret = hsmp_plat_dev_register();
+ if (ret)
+ platform_driver_unregister(&amd_hsmp_driver);
return ret;
}