Move platform device part to plat.c.
No functinality/logical changes.
Common code which can be used by ACPI and platform device
remains in hsmp.c.
ACPI code in hsmp.c will be moved to acpi.c in next patch.
Signed-off-by: Suma Hegde <suma.hegde@xxxxxxx>
Reviewed-by: Naveen Krishna Chatradhi <naveenkrishna.chatradhi@xxxxxxx>
---
Changes since v2:
None
Changes since v1:
1. Include new header file device.h in plat.c
2. Arrange headers in alphabetical order
3. Add an empty line between asm/ and linux/ headers
drivers/platform/x86/amd/hsmp/Makefile | 2 +-
drivers/platform/x86/amd/hsmp/hsmp.c | 350 ++-----------------------
drivers/platform/x86/amd/hsmp/hsmp.h | 17 ++
drivers/platform/x86/amd/hsmp/plat.c | 338 ++++++++++++++++++++++++
4 files changed, 371 insertions(+), 336 deletions(-)
create mode 100644 drivers/platform/x86/amd/hsmp/plat.c
diff --git a/drivers/platform/x86/amd/hsmp/Makefile b/drivers/platform/x86/amd/hsmp/Makefile
index fda64906a5e8..fb8ba04b2f0d 100644
--- a/drivers/platform/x86/amd/hsmp/Makefile
+++ b/drivers/platform/x86/amd/hsmp/Makefile
@@ -5,4 +5,4 @@
#
obj-$(CONFIG_AMD_HSMP) += amd_hsmp.o
-amd_hsmp-objs := hsmp.o
+amd_hsmp-objs := hsmp.o plat.o
diff --git a/drivers/platform/x86/amd/hsmp/hsmp.c b/drivers/platform/x86/amd/hsmp/hsmp.c
index 2c9ba51b9614..d15a978ff71e 100644
--- a/drivers/platform/x86/amd/hsmp/hsmp.c
+++ b/drivers/platform/x86/amd/hsmp/hsmp.c
@@ -12,16 +12,9 @@
#include "hsmp.h"
#include <asm/amd_hsmp.h>
-#include <asm/amd_nb.h>
-#include <linux/delay.h>
-#include <linux/module.h>
-#include <linux/pci.h>
-#include <linux/platform_device.h>
-#include <linux/acpi.h>
-#define DRIVER_NAME "amd_hsmp"
-#define DRIVER_VERSION "2.2"
-#define ACPI_HSMP_DEVICE_HID "AMDI0097"
+#include <linux/acpi.h>
+#include <linux/delay.h>
/* HSMP Status / Error codes */
#define HSMP_STATUS_NOT_READY 0x00
@@ -36,45 +29,12 @@
#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_BASE 0x3B00000
-#define SMN_HSMP_MSG_ID 0x0010534
-#define SMN_HSMP_MSG_ID_F1A_M0H 0x0010934
-#define SMN_HSMP_MSG_RESP 0x0010980
-#define SMN_HSMP_MSG_DATA 0x00109E0
-
-#define HSMP_INDEX_REG 0xc4
-#define HSMP_DATA_REG 0xc8
-
/* 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 plat_dev;
-
-static int amd_hsmp_pci_rdwr(struct hsmp_socket *sock, u32 offset,
- u32 *value, bool write)
-{
- int ret;
-
- if (!sock->root)
- return -ENODEV;
-
- ret = pci_write_config_dword(sock->root, HSMP_INDEX_REG,
- sock->mbinfo.base_addr + offset);
- if (ret)
- return ret;
-
- ret = (write ? pci_write_config_dword(sock->root, HSMP_DATA_REG, *value)
- : pci_read_config_dword(sock->root, HSMP_DATA_REG, value));
-
- return ret;
-}
+struct hsmp_plat_device plat_dev;
static void amd_hsmp_acpi_rdwr(struct hsmp_socket *sock, u32 offset,
u32 *value, bool write)
@@ -253,7 +213,7 @@ int hsmp_send_message(struct hsmp_message *msg)
}
EXPORT_SYMBOL_GPL(hsmp_send_message);
-static int hsmp_test(u16 sock_ind, u32 value)
+int hsmp_test(u16 sock_ind, u32 value)
{
struct hsmp_message msg = { 0 };
int ret;
@@ -283,7 +243,7 @@ static int hsmp_test(u16 sock_ind, u32 value)
return ret;
}
-static long hsmp_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
+long hsmp_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
{
int __user *arguser = (int __user *)arg;
struct hsmp_message msg = { 0 };
@@ -339,12 +299,6 @@ static long hsmp_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
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,
@@ -520,9 +474,9 @@ static int hsmp_parse_acpi_table(struct device *dev, u16 sock_ind)
return hsmp_read_acpi_dsd(sock);
}
-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)
+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 };
@@ -581,8 +535,8 @@ static int hsmp_get_tbl_dram_base(u16 sock_ind)
return 0;
}
-static umode_t hsmp_is_sock_attr_visible(struct kobject *kobj,
- struct bin_attribute *battr, int id)
+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;
@@ -611,8 +565,8 @@ static int hsmp_init_metric_tbl_bin_attr(struct bin_attribute **hattrs, u16 sock
/* One bin sysfs for metrics table */
#define NUM_HSMP_ATTRS 1
-static int hsmp_create_attr_list(struct attribute_group *attr_grp,
- struct device *dev, u16 sock_ind)
+int hsmp_create_attr_list(struct attribute_group *attr_grp,
+ struct device *dev, u16 sock_ind)
{
struct bin_attribute **hsmp_bin_attrs;
@@ -628,37 +582,7 @@ static int hsmp_create_attr_list(struct attribute_group *attr_grp,
return hsmp_init_metric_tbl_bin_attr(hsmp_bin_attrs, sock_ind);
}
-static int hsmp_create_non_acpi_sysfs_if(struct device *dev)
-{
- const struct attribute_group **hsmp_attr_grps;
- struct attribute_group *attr_grp;
- u16 i;
-
- hsmp_attr_grps = devm_kcalloc(dev, plat_dev.num_sockets + 1,
- sizeof(*hsmp_attr_grps),
- 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(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;
- attr_grp->is_bin_visible = hsmp_is_sock_attr_visible;
- hsmp_attr_grps[i] = attr_grp;
-
- hsmp_create_attr_list(attr_grp, dev, i);
- }
-
- return device_add_groups(dev, hsmp_attr_grps);
-}
-
-static int hsmp_create_acpi_sysfs_if(struct device *dev)
+int hsmp_create_acpi_sysfs_if(struct device *dev)
{
struct attribute_group *attr_grp;
u16 sock_ind;
@@ -681,7 +605,7 @@ static int hsmp_create_acpi_sysfs_if(struct device *dev)
return devm_device_add_group(dev, attr_grp);
}
-static int hsmp_cache_proto_ver(u16 sock_ind)
+int hsmp_cache_proto_ver(u16 sock_ind)
{
struct hsmp_message msg = { 0 };
int ret;
@@ -697,76 +621,7 @@ static int hsmp_cache_proto_ver(u16 sock_ind)
return ret;
}
-static inline bool is_f1a_m0h(void)
-{
- if (boot_cpu_data.x86 == 0x1A && boot_cpu_data.x86_model <= 0x0F)
- return true;
-
- return false;
-}
-
-static int init_platform_device(struct device *dev)
-{
- struct hsmp_socket *sock;
- int ret, i;
-
- for (i = 0; i < plat_dev.num_sockets; i++) {
- if (!node_to_amd_nb(i))
- return -ENODEV;
- sock = &plat_dev.sock[i];
- sock->root = node_to_amd_nb(i)->root;
- sock->sock_ind = i;
- sock->dev = dev;
- sock->mbinfo.base_addr = SMN_HSMP_BASE;
-
- /*
- * This is a transitional change from non-ACPI to ACPI, only
- * family 0x1A, model 0x00 platform is supported for both ACPI and non-ACPI.
- */
- if (is_f1a_m0h())
- sock->mbinfo.msg_id_off = SMN_HSMP_MSG_ID_F1A_M0H;
- else
- sock->mbinfo.msg_id_off = SMN_HSMP_MSG_ID;
-
- sock->mbinfo.msg_resp_off = SMN_HSMP_MSG_RESP;
- sock->mbinfo.msg_arg_off = SMN_HSMP_MSG_DATA;
- sema_init(&sock->hsmp_sem, 1);
-
- /* Test the hsmp interface on each socket */
- ret = hsmp_test(i, 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(i);
- if (ret) {
- dev_err(dev, "Failed to read HSMP protocol version\n");
- return ret;
- }
- }
-
- 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 init_acpi(struct device *dev)
+int init_acpi(struct device *dev)
{
u16 sock_ind;
int ret;
@@ -800,178 +655,3 @@ static int init_acpi(struct device *dev)
return ret;
}
-
-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 (!plat_dev.is_probed) {
- plat_dev.sock = devm_kcalloc(&pdev->dev, plat_dev.num_sockets,
- sizeof(*plat_dev.sock),
- GFP_KERNEL);
- if (!plat_dev.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");
- }
-
- if (!plat_dev.is_probed) {
- 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 = misc_register(&plat_dev.hsmp_device);
- if (ret)
- return ret;
-
- plat_dev.is_probed = true;
- }
-
- return 0;
-
-}
-
-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 (plat_dev.is_probed) {
- misc_deregister(&plat_dev.hsmp_device);
- plat_dev.is_probed = false;
- }
-}
-
-static struct platform_driver amd_hsmp_driver = {
- .probe = hsmp_pltdrv_probe,
- .remove_new = hsmp_pltdrv_remove,
- .driver = {
- .name = DRIVER_NAME,
- .acpi_match_table = amd_hsmp_acpi_ids,
- },
-};
-
-static struct platform_device *amd_hsmp_platdev;
-
-static int hsmp_plat_dev_register(void)
-{
- int ret;
-
- amd_hsmp_platdev = platform_device_alloc(DRIVER_NAME, PLATFORM_DEVID_NONE);
- if (!amd_hsmp_platdev)
- return -ENOMEM;
-
- ret = platform_device_add(amd_hsmp_platdev);
- if (ret)
- platform_device_put(amd_hsmp_platdev);
-
- return ret;
-}
-
-/*
- * This check is only needed for backward compatibility of previous platforms.
- * All new platforms are expected to support ACPI based probing.
- */
-static bool legacy_hsmp_support(void)
-{
- if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
- return false;
-
- switch (boot_cpu_data.x86) {
- case 0x19:
- switch (boot_cpu_data.x86_model) {
- case 0x00 ... 0x1F:
- case 0x30 ... 0x3F:
- case 0x90 ... 0x9F:
- case 0xA0 ... 0xAF:
- return true;
- default:
- return false;
- }
- case 0x1A:
- switch (boot_cpu_data.x86_model) {
- case 0x00 ... 0x1F:
- return true;
- default:
- return false;
- }
- default:
- return false;
- }
-
- return false;
-}
-
-static int __init hsmp_plt_init(void)
-{
- int ret = -ENODEV;
-
- /*
- * 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 || plat_dev.num_sockets > MAX_AMD_SOCKETS)
- return ret;
-
- ret = platform_driver_register(&amd_hsmp_driver);
- if (ret)
- return ret;
-
- if (!plat_dev.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);
- }
-
- 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");
diff --git a/drivers/platform/x86/amd/hsmp/hsmp.h b/drivers/platform/x86/amd/hsmp/hsmp.h
index 5afc7167fac1..1aa33c5633d0 100644
--- a/drivers/platform/x86/amd/hsmp/hsmp.h
+++ b/drivers/platform/x86/amd/hsmp/hsmp.h
@@ -51,4 +51,21 @@ struct hsmp_plat_device {
bool is_acpi_device;
bool is_probed;
};
+
+extern struct hsmp_plat_device plat_dev;
+
+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,
+ struct bin_attribute *battr, int id);
+int hsmp_create_attr_list(struct attribute_group *attr_grp,
+ struct device *dev, u16 sock_ind);
+int hsmp_test(u16 sock_ind, u32 value);
#endif /* HSMP_H */
diff --git a/drivers/platform/x86/amd/hsmp/plat.c b/drivers/platform/x86/amd/hsmp/plat.c
new file mode 100644
index 000000000000..2ed5a9452244
--- /dev/null
+++ b/drivers/platform/x86/amd/hsmp/plat.c
@@ -0,0 +1,338 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * AMD HSMP Platform Driver
+ * Copyright (c) 2024, AMD.
+ * All Rights Reserved.
+ *
+ * This file provides platform device implementations.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include "hsmp.h"
+
+#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"
+
+/*
+ * 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_BASE 0x3B00000
+#define SMN_HSMP_MSG_ID 0x0010534
+#define SMN_HSMP_MSG_ID_F1A_M0H 0x0010934
+#define SMN_HSMP_MSG_RESP 0x0010980
+#define SMN_HSMP_MSG_DATA 0x00109E0
+
+#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)
+{
+ int ret;
+
+ if (!sock->root)
+ return -ENODEV;
+
+ ret = pci_write_config_dword(sock->root, HSMP_INDEX_REG,
+ sock->mbinfo.base_addr + offset);
+ if (ret)
+ return ret;
+
+ ret = (write ? pci_write_config_dword(sock->root, HSMP_DATA_REG, *value)
+ : pci_read_config_dword(sock->root, HSMP_DATA_REG, value));
+
+ return ret;
+}
+
+static const struct file_operations hsmp_fops = {
+ .owner = THIS_MODULE,
+ .unlocked_ioctl = hsmp_ioctl,
+ .compat_ioctl = hsmp_ioctl,
+};
+
+static int hsmp_create_non_acpi_sysfs_if(struct device *dev)
+{
+ const struct attribute_group **hsmp_attr_grps;
+ struct attribute_group *attr_grp;
+ u16 i;
+
+ hsmp_attr_grps = devm_kcalloc(dev, plat_dev.num_sockets + 1,
+ sizeof(*hsmp_attr_grps),
+ 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(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;
+ attr_grp->is_bin_visible = hsmp_is_sock_attr_visible;
+ hsmp_attr_grps[i] = attr_grp;
+
+ hsmp_create_attr_list(attr_grp, dev, i);
+ }
+
+ return device_add_groups(dev, hsmp_attr_grps);
+}
+
+static inline bool is_f1a_m0h(void)
+{
+ if (boot_cpu_data.x86 == 0x1A && boot_cpu_data.x86_model <= 0x0F)
+ return true;
+
+ return false;
+}
+
+static int init_platform_device(struct device *dev)
+{
+ struct hsmp_socket *sock;
+ int ret, i;
+
+ for (i = 0; i < plat_dev.num_sockets; i++) {
+ if (!node_to_amd_nb(i))
+ return -ENODEV;
+ sock = &plat_dev.sock[i];
+ sock->root = node_to_amd_nb(i)->root;
+ sock->sock_ind = i;
+ sock->dev = dev;
+ sock->mbinfo.base_addr = SMN_HSMP_BASE;
+
+ /*
+ * This is a transitional change from non-ACPI to ACPI, only
+ * family 0x1A, model 0x00 platform is supported for both ACPI and non-ACPI.
+ */
+ if (is_f1a_m0h())
+ sock->mbinfo.msg_id_off = SMN_HSMP_MSG_ID_F1A_M0H;
+ else
+ sock->mbinfo.msg_id_off = SMN_HSMP_MSG_ID;
+
+ sock->mbinfo.msg_resp_off = SMN_HSMP_MSG_RESP;
+ sock->mbinfo.msg_arg_off = SMN_HSMP_MSG_DATA;
+ sema_init(&sock->hsmp_sem, 1);
+
+ /* Test the hsmp interface on each socket */
+ ret = hsmp_test(i, 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(i);
+ if (ret) {
+ dev_err(dev, "Failed to read HSMP protocol version\n");
+ return ret;
+ }
+ }
+
+ 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 (!plat_dev.is_probed) {
+ plat_dev.sock = devm_kcalloc(&pdev->dev, plat_dev.num_sockets,
+ sizeof(*plat_dev.sock),
+ GFP_KERNEL);
+ if (!plat_dev.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");
+ }
+
+ if (!plat_dev.is_probed) {
+ 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 = misc_register(&plat_dev.hsmp_device);
+ if (ret)
+ return ret;
+
+ plat_dev.is_probed = true;
+ }
+
+ return 0;
+}
+
+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 (plat_dev.is_probed) {
+ misc_deregister(&plat_dev.hsmp_device);
+ plat_dev.is_probed = false;
+ }
+}
+
+static struct platform_driver amd_hsmp_driver = {
+ .probe = hsmp_pltdrv_probe,
+ .remove_new = hsmp_pltdrv_remove,
+ .driver = {
+ .name = DRIVER_NAME,
+ .acpi_match_table = amd_hsmp_acpi_ids,
+ },
+};
+
+static struct platform_device *amd_hsmp_platdev;
+
+static int hsmp_plat_dev_register(void)
+{
+ int ret;
+
+ amd_hsmp_platdev = platform_device_alloc(DRIVER_NAME, PLATFORM_DEVID_NONE);
+ if (!amd_hsmp_platdev)
+ return -ENOMEM;
+
+ ret = platform_device_add(amd_hsmp_platdev);
+ if (ret)
+ platform_device_put(amd_hsmp_platdev);
+
+ return ret;
+}
+
+/*
+ * This check is only needed for backward compatibility of previous platforms.
+ * All new platforms are expected to support ACPI based probing.
+ */
+static bool legacy_hsmp_support(void)
+{
+ if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
+ return false;
+
+ switch (boot_cpu_data.x86) {
+ case 0x19:
+ switch (boot_cpu_data.x86_model) {
+ case 0x00 ... 0x1F:
+ case 0x30 ... 0x3F:
+ case 0x90 ... 0x9F:
+ case 0xA0 ... 0xAF:
+ return true;
+ default:
+ return false;
+ }
+ case 0x1A:
+ switch (boot_cpu_data.x86_model) {
+ case 0x00 ... 0x1F:
+ return true;
+ default:
+ return false;
+ }
+ default:
+ return false;
+ }
+
+ return false;
+}
+
+static int __init hsmp_plt_init(void)
+{
+ int ret = -ENODEV;
+
+ /*
+ * 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 || plat_dev.num_sockets > MAX_AMD_SOCKETS)
+ return ret;
+
+ ret = platform_driver_register(&amd_hsmp_driver);
+ if (ret)
+ return ret;
+
+ if (!plat_dev.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);
+ }
+
+ 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");
--
2.25.1
