blob: e73cdea67fff854c5bc0236769e42aae3539d0bb [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-only
/*
* intel-tpmi : Driver to enumerate TPMI features and create devices
*
* Copyright (c) 2023, Intel Corporation.
* All Rights Reserved.
*
* The TPMI (Topology Aware Register and PM Capsule Interface) provides a
* flexible, extendable and PCIe enumerable MMIO interface for PM features.
*
* For example Intel RAPL (Running Average Power Limit) provides a MMIO
* interface using TPMI. This has advantage over traditional MSR
* (Model Specific Register) interface, where a thread needs to be scheduled
* on the target CPU to read or write. Also the RAPL features vary between
* CPU models, and hence lot of model specific code. Here TPMI provides an
* architectural interface by providing hierarchical tables and fields,
* which will not need any model specific implementation.
*
* The TPMI interface uses a PCI VSEC structure to expose the location of
* MMIO region.
*
* This VSEC structure is present in the PCI configuration space of the
* Intel Out-of-Band (OOB) device, which is handled by the Intel VSEC
* driver. The Intel VSEC driver parses VSEC structures present in the PCI
* configuration space of the given device and creates an auxiliary device
* object for each of them. In particular, it creates an auxiliary device
* object representing TPMI that can be bound by an auxiliary driver.
*
* This TPMI driver will bind to the TPMI auxiliary device object created
* by the Intel VSEC driver.
*
* The TPMI specification defines a PFS (PM Feature Structure) table.
* This table is present in the TPMI MMIO region. The starting address
* of PFS is derived from the tBIR (Bar Indicator Register) and "Address"
* field from the VSEC header.
*
* Each TPMI PM feature has one entry in the PFS with a unique TPMI
* ID and its access details. The TPMI driver creates device nodes
* for the supported PM features.
*
* The names of the devices created by the TPMI driver start with the
* "intel_vsec.tpmi-" prefix which is followed by a specific name of the
* given PM feature (for example, "intel_vsec.tpmi-rapl.0").
*
* The device nodes are create by using interface "intel_vsec_add_aux()"
* provided by the Intel VSEC driver.
*/
#include <linux/auxiliary_bus.h>
#include <linux/bitfield.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/intel_tpmi.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/security.h>
#include <linux/sizes.h>
#include <linux/string_helpers.h>
#include "vsec.h"
/**
* struct intel_tpmi_pfs_entry - TPMI PM Feature Structure (PFS) entry
* @tpmi_id: TPMI feature identifier (what the feature is and its data format).
* @num_entries: Number of feature interface instances present in the PFS.
* This represents the maximum number of Power domains in the SoC.
* @entry_size: Interface instance entry size in 32-bit words.
* @cap_offset: Offset from the PM_Features base address to the base of the PM VSEC
* register bank in KB.
* @attribute: Feature attribute: 0=BIOS. 1=OS. 2-3=Reserved.
* @reserved: Bits for use in the future.
*
* Represents one TPMI feature entry data in the PFS retrieved as is
* from the hardware.
*/
struct intel_tpmi_pfs_entry {
u64 tpmi_id:8;
u64 num_entries:8;
u64 entry_size:16;
u64 cap_offset:16;
u64 attribute:2;
u64 reserved:14;
} __packed;
/**
* struct intel_tpmi_pm_feature - TPMI PM Feature information for a TPMI ID
* @pfs_header: PFS header retireved from the hardware.
* @vsec_offset: Starting MMIO address for this feature in bytes. Essentially
* this offset = "Address" from VSEC header + PFS Capability
* offset for this feature entry.
* @vsec_dev: Pointer to intel_vsec_device structure for this TPMI device
*
* Represents TPMI instance information for one TPMI ID.
*/
struct intel_tpmi_pm_feature {
struct intel_tpmi_pfs_entry pfs_header;
unsigned int vsec_offset;
struct intel_vsec_device *vsec_dev;
};
/**
* struct intel_tpmi_info - TPMI information for all IDs in an instance
* @tpmi_features: Pointer to a list of TPMI feature instances
* @vsec_dev: Pointer to intel_vsec_device structure for this TPMI device
* @feature_count: Number of TPMI of TPMI instances pointed by tpmi_features
* @pfs_start: Start of PFS offset for the TPMI instances in this device
* @plat_info: Stores platform info which can be used by the client drivers
* @tpmi_control_mem: Memory mapped IO for getting control information
* @dbgfs_dir: debugfs entry pointer
*
* Stores the information for all TPMI devices enumerated from a single PCI device.
*/
struct intel_tpmi_info {
struct intel_tpmi_pm_feature *tpmi_features;
struct intel_vsec_device *vsec_dev;
int feature_count;
u64 pfs_start;
struct intel_tpmi_plat_info plat_info;
void __iomem *tpmi_control_mem;
struct dentry *dbgfs_dir;
};
/**
* struct tpmi_info_header - CPU package ID to PCI device mapping information
* @fn: PCI function number
* @dev: PCI device number
* @bus: PCI bus number
* @pkg: CPU Package id
* @reserved: Reserved for future use
* @lock: When set to 1 the register is locked and becomes read-only
* until next reset. Not for use by the OS driver.
*
* The structure to read hardware provided mapping information.
*/
struct tpmi_info_header {
u64 fn:3;
u64 dev:5;
u64 bus:8;
u64 pkg:8;
u64 reserved:39;
u64 lock:1;
} __packed;
/**
* struct tpmi_feature_state - Structure to read hardware state of a feature
* @enabled: Enable state of a feature, 1: enabled, 0: disabled
* @reserved_1: Reserved for future use
* @write_blocked: Writes are blocked means all write operations are ignored
* @read_blocked: Reads are blocked means will read 0xFFs
* @pcs_select: Interface used by out of band software, not used in OS
* @reserved_2: Reserved for future use
* @id: TPMI ID of the feature
* @reserved_3: Reserved for future use
* @locked: When set to 1, OS can't change this register.
*
* The structure is used to read hardware state of a TPMI feature. This
* information is used for debug and restricting operations for this feature.
*/
struct tpmi_feature_state {
u32 enabled:1;
u32 reserved_1:3;
u32 write_blocked:1;
u32 read_blocked:1;
u32 pcs_select:1;
u32 reserved_2:1;
u32 id:8;
u32 reserved_3:15;
u32 locked:1;
} __packed;
/*
* The size from hardware is in u32 units. This size is from a trusted hardware,
* but better to verify for pre silicon platforms. Set size to 0, when invalid.
*/
#define TPMI_GET_SINGLE_ENTRY_SIZE(pfs) \
({ \
pfs->pfs_header.entry_size > SZ_1K ? 0 : pfs->pfs_header.entry_size << 2; \
})
/* Used during auxbus device creation */
static DEFINE_IDA(intel_vsec_tpmi_ida);
struct intel_tpmi_plat_info *tpmi_get_platform_data(struct auxiliary_device *auxdev)
{
struct intel_vsec_device *vsec_dev = auxdev_to_ivdev(auxdev);
return vsec_dev->priv_data;
}
EXPORT_SYMBOL_NS_GPL(tpmi_get_platform_data, INTEL_TPMI);
int tpmi_get_resource_count(struct auxiliary_device *auxdev)
{
struct intel_vsec_device *vsec_dev = auxdev_to_ivdev(auxdev);
if (vsec_dev)
return vsec_dev->num_resources;
return 0;
}
EXPORT_SYMBOL_NS_GPL(tpmi_get_resource_count, INTEL_TPMI);
struct resource *tpmi_get_resource_at_index(struct auxiliary_device *auxdev, int index)
{
struct intel_vsec_device *vsec_dev = auxdev_to_ivdev(auxdev);
if (vsec_dev && index < vsec_dev->num_resources)
return &vsec_dev->resource[index];
return NULL;
}
EXPORT_SYMBOL_NS_GPL(tpmi_get_resource_at_index, INTEL_TPMI);
/* TPMI Control Interface */
#define TPMI_CONTROL_STATUS_OFFSET 0x00
#define TPMI_COMMAND_OFFSET 0x08
#define TMPI_CONTROL_DATA_VAL_OFFSET 0x0c
/*
* Spec is calling for max 1 seconds to get ownership at the worst
* case. Read at 10 ms timeouts and repeat up to 1 second.
*/
#define TPMI_CONTROL_TIMEOUT_US (10 * USEC_PER_MSEC)
#define TPMI_CONTROL_TIMEOUT_MAX_US (1 * USEC_PER_SEC)
#define TPMI_RB_TIMEOUT_US (10 * USEC_PER_MSEC)
#define TPMI_RB_TIMEOUT_MAX_US USEC_PER_SEC
/* TPMI Control status register defines */
#define TPMI_CONTROL_STATUS_RB BIT_ULL(0)
#define TPMI_CONTROL_STATUS_OWNER GENMASK_ULL(5, 4)
#define TPMI_OWNER_NONE 0
#define TPMI_OWNER_IN_BAND 1
#define TPMI_CONTROL_STATUS_CPL BIT_ULL(6)
#define TPMI_CONTROL_STATUS_RESULT GENMASK_ULL(15, 8)
#define TPMI_CONTROL_STATUS_LEN GENMASK_ULL(31, 16)
#define TPMI_CMD_PKT_LEN 2
#define TPMI_CMD_STATUS_SUCCESS 0x40
/* TPMI command data registers */
#define TMPI_CONTROL_DATA_CMD GENMASK_ULL(7, 0)
#define TPMI_CONTROL_DATA_VAL_FEATURE GENMASK_ULL(48, 40)
/* Command to send via control interface */
#define TPMI_CONTROL_GET_STATE_CMD 0x10
#define TPMI_CONTROL_CMD_MASK GENMASK_ULL(48, 40)
#define TPMI_CMD_LEN_MASK GENMASK_ULL(18, 16)
/* Mutex to complete get feature status without interruption */
static DEFINE_MUTEX(tpmi_dev_lock);
static int tpmi_wait_for_owner(struct intel_tpmi_info *tpmi_info, u8 owner)
{
u64 control;
return readq_poll_timeout(tpmi_info->tpmi_control_mem + TPMI_CONTROL_STATUS_OFFSET,
control, owner == FIELD_GET(TPMI_CONTROL_STATUS_OWNER, control),
TPMI_CONTROL_TIMEOUT_US, TPMI_CONTROL_TIMEOUT_MAX_US);
}
static int tpmi_read_feature_status(struct intel_tpmi_info *tpmi_info, int feature_id,
struct tpmi_feature_state *feature_state)
{
u64 control, data;
int ret;
if (!tpmi_info->tpmi_control_mem)
return -EFAULT;
mutex_lock(&tpmi_dev_lock);
/* Wait for owner bit set to 0 (none) */
ret = tpmi_wait_for_owner(tpmi_info, TPMI_OWNER_NONE);
if (ret)
goto err_unlock;
/* set command id to 0x10 for TPMI_GET_STATE */
data = FIELD_PREP(TMPI_CONTROL_DATA_CMD, TPMI_CONTROL_GET_STATE_CMD);
/* 32 bits for DATA offset and +8 for feature_id field */
data |= FIELD_PREP(TPMI_CONTROL_DATA_VAL_FEATURE, feature_id);
/* Write at command offset for qword access */
writeq(data, tpmi_info->tpmi_control_mem + TPMI_COMMAND_OFFSET);
/* Wait for owner bit set to in-band */
ret = tpmi_wait_for_owner(tpmi_info, TPMI_OWNER_IN_BAND);
if (ret)
goto err_unlock;
/* Set Run Busy and packet length of 2 dwords */
control = TPMI_CONTROL_STATUS_RB;
control |= FIELD_PREP(TPMI_CONTROL_STATUS_LEN, TPMI_CMD_PKT_LEN);
/* Write at status offset for qword access */
writeq(control, tpmi_info->tpmi_control_mem + TPMI_CONTROL_STATUS_OFFSET);
/* Wait for Run Busy clear */
ret = readq_poll_timeout(tpmi_info->tpmi_control_mem + TPMI_CONTROL_STATUS_OFFSET,
control, !(control & TPMI_CONTROL_STATUS_RB),
TPMI_RB_TIMEOUT_US, TPMI_RB_TIMEOUT_MAX_US);
if (ret)
goto done_proc;
control = FIELD_GET(TPMI_CONTROL_STATUS_RESULT, control);
if (control != TPMI_CMD_STATUS_SUCCESS) {
ret = -EBUSY;
goto done_proc;
}
/* Response is ready */
memcpy_fromio(feature_state, tpmi_info->tpmi_control_mem + TMPI_CONTROL_DATA_VAL_OFFSET,
sizeof(*feature_state));
ret = 0;
done_proc:
/* Set CPL "completion" bit */
writeq(TPMI_CONTROL_STATUS_CPL, tpmi_info->tpmi_control_mem + TPMI_CONTROL_STATUS_OFFSET);
err_unlock:
mutex_unlock(&tpmi_dev_lock);
return ret;
}
int tpmi_get_feature_status(struct auxiliary_device *auxdev,
int feature_id, bool *read_blocked, bool *write_blocked)
{
struct intel_vsec_device *intel_vsec_dev = dev_to_ivdev(auxdev->dev.parent);
struct intel_tpmi_info *tpmi_info = auxiliary_get_drvdata(&intel_vsec_dev->auxdev);
struct tpmi_feature_state feature_state;
int ret;
ret = tpmi_read_feature_status(tpmi_info, feature_id, &feature_state);
if (ret)
return ret;
*read_blocked = feature_state.read_blocked;
*write_blocked = feature_state.write_blocked;
return 0;
}
EXPORT_SYMBOL_NS_GPL(tpmi_get_feature_status, INTEL_TPMI);
static int tpmi_pfs_dbg_show(struct seq_file *s, void *unused)
{
struct intel_tpmi_info *tpmi_info = s->private;
int locked, disabled, read_blocked, write_blocked;
struct tpmi_feature_state feature_state;
struct intel_tpmi_pm_feature *pfs;
int ret, i;
seq_printf(s, "tpmi PFS start offset 0x:%llx\n", tpmi_info->pfs_start);
seq_puts(s, "tpmi_id\t\tentries\t\tsize\t\tcap_offset\tattribute\tvsec_offset\tlocked\tdisabled\tread_blocked\twrite_blocked\n");
for (i = 0; i < tpmi_info->feature_count; ++i) {
pfs = &tpmi_info->tpmi_features[i];
ret = tpmi_read_feature_status(tpmi_info, pfs->pfs_header.tpmi_id, &feature_state);
if (ret) {
locked = 'U';
disabled = 'U';
read_blocked = 'U';
write_blocked = 'U';
} else {
disabled = feature_state.enabled ? 'N' : 'Y';
locked = feature_state.locked ? 'Y' : 'N';
read_blocked = feature_state.read_blocked ? 'Y' : 'N';
write_blocked = feature_state.write_blocked ? 'Y' : 'N';
}
seq_printf(s, "0x%02x\t\t0x%02x\t\t0x%04x\t\t0x%04x\t\t0x%02x\t\t0x%08x\t%c\t%c\t\t%c\t\t%c\n",
pfs->pfs_header.tpmi_id, pfs->pfs_header.num_entries,
pfs->pfs_header.entry_size, pfs->pfs_header.cap_offset,
pfs->pfs_header.attribute, pfs->vsec_offset, locked, disabled,
read_blocked, write_blocked);
}
return 0;
}
DEFINE_SHOW_ATTRIBUTE(tpmi_pfs_dbg);
#define MEM_DUMP_COLUMN_COUNT 8
static int tpmi_mem_dump_show(struct seq_file *s, void *unused)
{
size_t row_size = MEM_DUMP_COLUMN_COUNT * sizeof(u32);
struct intel_tpmi_pm_feature *pfs = s->private;
int count, ret = 0;
void __iomem *mem;
u32 off, size;
u8 *buffer;
size = TPMI_GET_SINGLE_ENTRY_SIZE(pfs);
if (!size)
return -EIO;
buffer = kmalloc(size, GFP_KERNEL);
if (!buffer)
return -ENOMEM;
off = pfs->vsec_offset;
mutex_lock(&tpmi_dev_lock);
for (count = 0; count < pfs->pfs_header.num_entries; ++count) {
seq_printf(s, "TPMI Instance:%d offset:0x%x\n", count, off);
mem = ioremap(off, size);
if (!mem) {
ret = -ENOMEM;
break;
}
memcpy_fromio(buffer, mem, size);
seq_hex_dump(s, " ", DUMP_PREFIX_OFFSET, row_size, sizeof(u32), buffer, size,
false);
iounmap(mem);
off += size;
}
mutex_unlock(&tpmi_dev_lock);
kfree(buffer);
return ret;
}
DEFINE_SHOW_ATTRIBUTE(tpmi_mem_dump);
static ssize_t mem_write(struct file *file, const char __user *userbuf, size_t len, loff_t *ppos)
{
struct seq_file *m = file->private_data;
struct intel_tpmi_pm_feature *pfs = m->private;
u32 addr, value, punit, size;
u32 num_elems, *array;
void __iomem *mem;
int ret;
size = TPMI_GET_SINGLE_ENTRY_SIZE(pfs);
if (!size)
return -EIO;
ret = parse_int_array_user(userbuf, len, (int **)&array);
if (ret < 0)
return ret;
num_elems = *array;
if (num_elems != 3) {
ret = -EINVAL;
goto exit_write;
}
punit = array[1];
addr = array[2];
value = array[3];
if (punit >= pfs->pfs_header.num_entries) {
ret = -EINVAL;
goto exit_write;
}
if (addr >= size) {
ret = -EINVAL;
goto exit_write;
}
mutex_lock(&tpmi_dev_lock);
mem = ioremap(pfs->vsec_offset + punit * size, size);
if (!mem) {
ret = -ENOMEM;
goto unlock_mem_write;
}
writel(value, mem + addr);
iounmap(mem);
ret = len;
unlock_mem_write:
mutex_unlock(&tpmi_dev_lock);
exit_write:
kfree(array);
return ret;
}
static int mem_write_show(struct seq_file *s, void *unused)
{
return 0;
}
static int mem_write_open(struct inode *inode, struct file *file)
{
return single_open(file, mem_write_show, inode->i_private);
}
static const struct file_operations mem_write_ops = {
.open = mem_write_open,
.read = seq_read,
.write = mem_write,
.llseek = seq_lseek,
.release = single_release,
};
#define tpmi_to_dev(info) (&info->vsec_dev->pcidev->dev)
static void tpmi_dbgfs_register(struct intel_tpmi_info *tpmi_info)
{
char name[64];
int i;
snprintf(name, sizeof(name), "tpmi-%s", dev_name(tpmi_to_dev(tpmi_info)));
tpmi_info->dbgfs_dir = debugfs_create_dir(name, NULL);
debugfs_create_file("pfs_dump", 0444, tpmi_info->dbgfs_dir, tpmi_info, &tpmi_pfs_dbg_fops);
for (i = 0; i < tpmi_info->feature_count; ++i) {
struct intel_tpmi_pm_feature *pfs;
struct dentry *dir;
pfs = &tpmi_info->tpmi_features[i];
snprintf(name, sizeof(name), "tpmi-id-%02x", pfs->pfs_header.tpmi_id);
dir = debugfs_create_dir(name, tpmi_info->dbgfs_dir);
debugfs_create_file("mem_dump", 0444, dir, pfs, &tpmi_mem_dump_fops);
debugfs_create_file("mem_write", 0644, dir, pfs, &mem_write_ops);
}
}
static void tpmi_set_control_base(struct auxiliary_device *auxdev,
struct intel_tpmi_info *tpmi_info,
struct intel_tpmi_pm_feature *pfs)
{
void __iomem *mem;
u32 size;
size = TPMI_GET_SINGLE_ENTRY_SIZE(pfs);
if (!size)
return;
mem = devm_ioremap(&auxdev->dev, pfs->vsec_offset, size);
if (!mem)
return;
/* mem is pointing to TPMI CONTROL base */
tpmi_info->tpmi_control_mem = mem;
}
static const char *intel_tpmi_name(enum intel_tpmi_id id)
{
switch (id) {
case TPMI_ID_RAPL:
return "rapl";
case TPMI_ID_PEM:
return "pem";
case TPMI_ID_UNCORE:
return "uncore";
case TPMI_ID_SST:
return "sst";
default:
return NULL;
}
}
/* String Length for tpmi-"feature_name(upto 8 bytes)" */
#define TPMI_FEATURE_NAME_LEN 14
static int tpmi_create_device(struct intel_tpmi_info *tpmi_info,
struct intel_tpmi_pm_feature *pfs,
u64 pfs_start)
{
struct intel_vsec_device *vsec_dev = tpmi_info->vsec_dev;
char feature_id_name[TPMI_FEATURE_NAME_LEN];
struct intel_vsec_device *feature_vsec_dev;
struct tpmi_feature_state feature_state;
struct resource *res, *tmp;
const char *name;
int i, ret;
ret = tpmi_read_feature_status(tpmi_info, pfs->pfs_header.tpmi_id, &feature_state);
if (ret)
return ret;
/*
* If not enabled, continue to look at other features in the PFS, so return -EOPNOTSUPP.
* This will not cause failure of loading of this driver.
*/
if (!feature_state.enabled)
return -EOPNOTSUPP;
name = intel_tpmi_name(pfs->pfs_header.tpmi_id);
if (!name)
return -EOPNOTSUPP;
res = kcalloc(pfs->pfs_header.num_entries, sizeof(*res), GFP_KERNEL);
if (!res)
return -ENOMEM;
feature_vsec_dev = kzalloc(sizeof(*feature_vsec_dev), GFP_KERNEL);
if (!feature_vsec_dev) {
kfree(res);
return -ENOMEM;
}
snprintf(feature_id_name, sizeof(feature_id_name), "tpmi-%s", name);
for (i = 0, tmp = res; i < pfs->pfs_header.num_entries; i++, tmp++) {
u64 entry_size_bytes = pfs->pfs_header.entry_size * sizeof(u32);
tmp->start = pfs->vsec_offset + entry_size_bytes * i;
tmp->end = tmp->start + entry_size_bytes - 1;
tmp->flags = IORESOURCE_MEM;
}
feature_vsec_dev->pcidev = vsec_dev->pcidev;
feature_vsec_dev->resource = res;
feature_vsec_dev->num_resources = pfs->pfs_header.num_entries;
feature_vsec_dev->priv_data = &tpmi_info->plat_info;
feature_vsec_dev->priv_data_size = sizeof(tpmi_info->plat_info);
feature_vsec_dev->ida = &intel_vsec_tpmi_ida;
/*
* intel_vsec_add_aux() is resource managed, no explicit
* delete is required on error or on module unload.
* feature_vsec_dev and res memory are also freed as part of
* device deletion.
*/
return intel_vsec_add_aux(vsec_dev->pcidev, &vsec_dev->auxdev.dev,
feature_vsec_dev, feature_id_name);
}
static int tpmi_create_devices(struct intel_tpmi_info *tpmi_info)
{
struct intel_vsec_device *vsec_dev = tpmi_info->vsec_dev;
int ret, i;
for (i = 0; i < vsec_dev->num_resources; i++) {
ret = tpmi_create_device(tpmi_info, &tpmi_info->tpmi_features[i],
tpmi_info->pfs_start);
/*
* Fail, if the supported features fails to create device,
* otherwise, continue. Even if one device failed to create,
* fail the loading of driver. Since intel_vsec_add_aux()
* is resource managed, no clean up is required for the
* successfully created devices.
*/
if (ret && ret != -EOPNOTSUPP)
return ret;
}
return 0;
}
#define TPMI_INFO_BUS_INFO_OFFSET 0x08
static int tpmi_process_info(struct intel_tpmi_info *tpmi_info,
struct intel_tpmi_pm_feature *pfs)
{
struct tpmi_info_header header;
void __iomem *info_mem;
info_mem = ioremap(pfs->vsec_offset + TPMI_INFO_BUS_INFO_OFFSET,
pfs->pfs_header.entry_size * sizeof(u32) - TPMI_INFO_BUS_INFO_OFFSET);
if (!info_mem)
return -ENOMEM;
memcpy_fromio(&header, info_mem, sizeof(header));
tpmi_info->plat_info.package_id = header.pkg;
tpmi_info->plat_info.bus_number = header.bus;
tpmi_info->plat_info.device_number = header.dev;
tpmi_info->plat_info.function_number = header.fn;
iounmap(info_mem);
return 0;
}
static int tpmi_fetch_pfs_header(struct intel_tpmi_pm_feature *pfs, u64 start, int size)
{
void __iomem *pfs_mem;
pfs_mem = ioremap(start, size);
if (!pfs_mem)
return -ENOMEM;
memcpy_fromio(&pfs->pfs_header, pfs_mem, sizeof(pfs->pfs_header));
iounmap(pfs_mem);
return 0;
}
#define TPMI_CAP_OFFSET_UNIT 1024
static int intel_vsec_tpmi_init(struct auxiliary_device *auxdev)
{
struct intel_vsec_device *vsec_dev = auxdev_to_ivdev(auxdev);
struct pci_dev *pci_dev = vsec_dev->pcidev;
struct intel_tpmi_info *tpmi_info;
u64 pfs_start = 0;
int ret, i;
tpmi_info = devm_kzalloc(&auxdev->dev, sizeof(*tpmi_info), GFP_KERNEL);
if (!tpmi_info)
return -ENOMEM;
tpmi_info->vsec_dev = vsec_dev;
tpmi_info->feature_count = vsec_dev->num_resources;
tpmi_info->plat_info.bus_number = pci_dev->bus->number;
tpmi_info->tpmi_features = devm_kcalloc(&auxdev->dev, vsec_dev->num_resources,
sizeof(*tpmi_info->tpmi_features),
GFP_KERNEL);
if (!tpmi_info->tpmi_features)
return -ENOMEM;
for (i = 0; i < vsec_dev->num_resources; i++) {
struct intel_tpmi_pm_feature *pfs;
struct resource *res;
u64 res_start;
int size, ret;
pfs = &tpmi_info->tpmi_features[i];
pfs->vsec_dev = vsec_dev;
res = &vsec_dev->resource[i];
if (!res)
continue;
res_start = res->start;
size = resource_size(res);
if (size < 0)
continue;
ret = tpmi_fetch_pfs_header(pfs, res_start, size);
if (ret)
continue;
if (!pfs_start)
pfs_start = res_start;
pfs->vsec_offset = pfs_start + pfs->pfs_header.cap_offset * TPMI_CAP_OFFSET_UNIT;
/*
* Process TPMI_INFO to get PCI device to CPU package ID.
* Device nodes for TPMI features are not created in this
* for loop. So, the mapping information will be available
* when actual device nodes created outside this
* loop via tpmi_create_devices().
*/
if (pfs->pfs_header.tpmi_id == TPMI_INFO_ID)
tpmi_process_info(tpmi_info, pfs);
if (pfs->pfs_header.tpmi_id == TPMI_CONTROL_ID)
tpmi_set_control_base(auxdev, tpmi_info, pfs);
}
tpmi_info->pfs_start = pfs_start;
auxiliary_set_drvdata(auxdev, tpmi_info);
ret = tpmi_create_devices(tpmi_info);
if (ret)
return ret;
/*
* Allow debugfs when security policy allows. Everything this debugfs
* interface provides, can also be done via /dev/mem access. If
* /dev/mem interface is locked, don't allow debugfs to present any
* information. Also check for CAP_SYS_RAWIO as /dev/mem interface.
*/
if (!security_locked_down(LOCKDOWN_DEV_MEM) && capable(CAP_SYS_RAWIO))
tpmi_dbgfs_register(tpmi_info);
return 0;
}
static int tpmi_probe(struct auxiliary_device *auxdev,
const struct auxiliary_device_id *id)
{
return intel_vsec_tpmi_init(auxdev);
}
static void tpmi_remove(struct auxiliary_device *auxdev)
{
struct intel_tpmi_info *tpmi_info = auxiliary_get_drvdata(auxdev);
debugfs_remove_recursive(tpmi_info->dbgfs_dir);
}
static const struct auxiliary_device_id tpmi_id_table[] = {
{ .name = "intel_vsec.tpmi" },
{}
};
MODULE_DEVICE_TABLE(auxiliary, tpmi_id_table);
static struct auxiliary_driver tpmi_aux_driver = {
.id_table = tpmi_id_table,
.probe = tpmi_probe,
.remove = tpmi_remove,
};
module_auxiliary_driver(tpmi_aux_driver);
MODULE_IMPORT_NS(INTEL_VSEC);
MODULE_DESCRIPTION("Intel TPMI enumeration module");
MODULE_LICENSE("GPL");