1 // SPDX-License-Identifier: GPL-2.0-only
3 * intel-tpmi : Driver to enumerate TPMI features and create devices
5 * Copyright (c) 2023, Intel Corporation.
8 * The TPMI (Topology Aware Register and PM Capsule Interface) provides a
9 * flexible, extendable and PCIe enumerable MMIO interface for PM features.
11 * For example Intel RAPL (Running Average Power Limit) provides a MMIO
12 * interface using TPMI. This has advantage over traditional MSR
13 * (Model Specific Register) interface, where a thread needs to be scheduled
14 * on the target CPU to read or write. Also the RAPL features vary between
15 * CPU models, and hence lot of model specific code. Here TPMI provides an
16 * architectural interface by providing hierarchical tables and fields,
17 * which will not need any model specific implementation.
19 * The TPMI interface uses a PCI VSEC structure to expose the location of
22 * This VSEC structure is present in the PCI configuration space of the
23 * Intel Out-of-Band (OOB) device, which is handled by the Intel VSEC
24 * driver. The Intel VSEC driver parses VSEC structures present in the PCI
25 * configuration space of the given device and creates an auxiliary device
26 * object for each of them. In particular, it creates an auxiliary device
27 * object representing TPMI that can be bound by an auxiliary driver.
29 * This TPMI driver will bind to the TPMI auxiliary device object created
30 * by the Intel VSEC driver.
32 * The TPMI specification defines a PFS (PM Feature Structure) table.
33 * This table is present in the TPMI MMIO region. The starting address
34 * of PFS is derived from the tBIR (Bar Indicator Register) and "Address"
35 * field from the VSEC header.
37 * Each TPMI PM feature has one entry in the PFS with a unique TPMI
38 * ID and its access details. The TPMI driver creates device nodes
39 * for the supported PM features.
41 * The names of the devices created by the TPMI driver start with the
42 * "intel_vsec.tpmi-" prefix which is followed by a specific name of the
43 * given PM feature (for example, "intel_vsec.tpmi-rapl.0").
45 * The device nodes are create by using interface "intel_vsec_add_aux()"
46 * provided by the Intel VSEC driver.
49 #include <linux/auxiliary_bus.h>
50 #include <linux/bitfield.h>
51 #include <linux/debugfs.h>
52 #include <linux/delay.h>
53 #include <linux/intel_tpmi.h>
55 #include <linux/iopoll.h>
56 #include <linux/module.h>
57 #include <linux/pci.h>
58 #include <linux/security.h>
59 #include <linux/sizes.h>
60 #include <linux/string_helpers.h>
65 * struct intel_tpmi_pfs_entry - TPMI PM Feature Structure (PFS) entry
66 * @tpmi_id: TPMI feature identifier (what the feature is and its data format).
67 * @num_entries: Number of feature interface instances present in the PFS.
68 * This represents the maximum number of Power domains in the SoC.
69 * @entry_size: Interface instance entry size in 32-bit words.
70 * @cap_offset: Offset from the PM_Features base address to the base of the PM VSEC
71 * register bank in KB.
72 * @attribute: Feature attribute: 0=BIOS. 1=OS. 2-3=Reserved.
73 * @reserved: Bits for use in the future.
75 * Represents one TPMI feature entry data in the PFS retrieved as is
78 struct intel_tpmi_pfs_entry {
88 * struct intel_tpmi_pm_feature - TPMI PM Feature information for a TPMI ID
89 * @pfs_header: PFS header retireved from the hardware.
90 * @vsec_offset: Starting MMIO address for this feature in bytes. Essentially
91 * this offset = "Address" from VSEC header + PFS Capability
92 * offset for this feature entry.
93 * @vsec_dev: Pointer to intel_vsec_device structure for this TPMI device
95 * Represents TPMI instance information for one TPMI ID.
97 struct intel_tpmi_pm_feature {
98 struct intel_tpmi_pfs_entry pfs_header;
100 struct intel_vsec_device *vsec_dev;
104 * struct intel_tpmi_info - TPMI information for all IDs in an instance
105 * @tpmi_features: Pointer to a list of TPMI feature instances
106 * @vsec_dev: Pointer to intel_vsec_device structure for this TPMI device
107 * @feature_count: Number of TPMI of TPMI instances pointed by tpmi_features
108 * @pfs_start: Start of PFS offset for the TPMI instances in this device
109 * @plat_info: Stores platform info which can be used by the client drivers
110 * @tpmi_control_mem: Memory mapped IO for getting control information
111 * @dbgfs_dir: debugfs entry pointer
113 * Stores the information for all TPMI devices enumerated from a single PCI device.
115 struct intel_tpmi_info {
116 struct intel_tpmi_pm_feature *tpmi_features;
117 struct intel_vsec_device *vsec_dev;
120 struct intel_tpmi_plat_info plat_info;
121 void __iomem *tpmi_control_mem;
122 struct dentry *dbgfs_dir;
126 * struct tpmi_info_header - CPU package ID to PCI device mapping information
127 * @fn: PCI function number
128 * @dev: PCI device number
129 * @bus: PCI bus number
130 * @pkg: CPU Package id
131 * @segment: PCI segment id
132 * @partition: Package Partition id
133 * @cdie_mask: Bitmap of compute dies in the current partition
134 * @reserved: Reserved for future use
135 * @lock: When set to 1 the register is locked and becomes read-only
136 * until next reset. Not for use by the OS driver.
138 * The structure to read hardware provided mapping information.
140 struct tpmi_info_header {
153 * struct tpmi_feature_state - Structure to read hardware state of a feature
154 * @enabled: Enable state of a feature, 1: enabled, 0: disabled
155 * @reserved_1: Reserved for future use
156 * @write_blocked: Writes are blocked means all write operations are ignored
157 * @read_blocked: Reads are blocked means will read 0xFFs
158 * @pcs_select: Interface used by out of band software, not used in OS
159 * @reserved_2: Reserved for future use
160 * @id: TPMI ID of the feature
161 * @reserved_3: Reserved for future use
162 * @locked: When set to 1, OS can't change this register.
164 * The structure is used to read hardware state of a TPMI feature. This
165 * information is used for debug and restricting operations for this feature.
167 struct tpmi_feature_state {
180 * The size from hardware is in u32 units. This size is from a trusted hardware,
181 * but better to verify for pre silicon platforms. Set size to 0, when invalid.
183 #define TPMI_GET_SINGLE_ENTRY_SIZE(pfs) \
185 pfs->pfs_header.entry_size > SZ_1K ? 0 : pfs->pfs_header.entry_size << 2; \
188 /* Used during auxbus device creation */
189 static DEFINE_IDA(intel_vsec_tpmi_ida);
191 struct intel_tpmi_plat_info *tpmi_get_platform_data(struct auxiliary_device *auxdev)
193 struct intel_vsec_device *vsec_dev = auxdev_to_ivdev(auxdev);
195 return vsec_dev->priv_data;
197 EXPORT_SYMBOL_NS_GPL(tpmi_get_platform_data, INTEL_TPMI);
199 int tpmi_get_resource_count(struct auxiliary_device *auxdev)
201 struct intel_vsec_device *vsec_dev = auxdev_to_ivdev(auxdev);
204 return vsec_dev->num_resources;
208 EXPORT_SYMBOL_NS_GPL(tpmi_get_resource_count, INTEL_TPMI);
210 struct resource *tpmi_get_resource_at_index(struct auxiliary_device *auxdev, int index)
212 struct intel_vsec_device *vsec_dev = auxdev_to_ivdev(auxdev);
214 if (vsec_dev && index < vsec_dev->num_resources)
215 return &vsec_dev->resource[index];
219 EXPORT_SYMBOL_NS_GPL(tpmi_get_resource_at_index, INTEL_TPMI);
221 /* TPMI Control Interface */
223 #define TPMI_CONTROL_STATUS_OFFSET 0x00
224 #define TPMI_COMMAND_OFFSET 0x08
225 #define TMPI_CONTROL_DATA_VAL_OFFSET 0x0c
228 * Spec is calling for max 1 seconds to get ownership at the worst
229 * case. Read at 10 ms timeouts and repeat up to 1 second.
231 #define TPMI_CONTROL_TIMEOUT_US (10 * USEC_PER_MSEC)
232 #define TPMI_CONTROL_TIMEOUT_MAX_US (1 * USEC_PER_SEC)
234 #define TPMI_RB_TIMEOUT_US (10 * USEC_PER_MSEC)
235 #define TPMI_RB_TIMEOUT_MAX_US USEC_PER_SEC
237 /* TPMI Control status register defines */
239 #define TPMI_CONTROL_STATUS_RB BIT_ULL(0)
241 #define TPMI_CONTROL_STATUS_OWNER GENMASK_ULL(5, 4)
242 #define TPMI_OWNER_NONE 0
243 #define TPMI_OWNER_IN_BAND 1
245 #define TPMI_CONTROL_STATUS_CPL BIT_ULL(6)
246 #define TPMI_CONTROL_STATUS_RESULT GENMASK_ULL(15, 8)
247 #define TPMI_CONTROL_STATUS_LEN GENMASK_ULL(31, 16)
249 #define TPMI_CMD_PKT_LEN 2
250 #define TPMI_CMD_STATUS_SUCCESS 0x40
252 /* TPMI command data registers */
253 #define TMPI_CONTROL_DATA_CMD GENMASK_ULL(7, 0)
254 #define TPMI_CONTROL_DATA_VAL_FEATURE GENMASK_ULL(48, 40)
256 /* Command to send via control interface */
257 #define TPMI_CONTROL_GET_STATE_CMD 0x10
259 #define TPMI_CONTROL_CMD_MASK GENMASK_ULL(48, 40)
261 #define TPMI_CMD_LEN_MASK GENMASK_ULL(18, 16)
263 /* Mutex to complete get feature status without interruption */
264 static DEFINE_MUTEX(tpmi_dev_lock);
266 static int tpmi_wait_for_owner(struct intel_tpmi_info *tpmi_info, u8 owner)
270 return readq_poll_timeout(tpmi_info->tpmi_control_mem + TPMI_CONTROL_STATUS_OFFSET,
271 control, owner == FIELD_GET(TPMI_CONTROL_STATUS_OWNER, control),
272 TPMI_CONTROL_TIMEOUT_US, TPMI_CONTROL_TIMEOUT_MAX_US);
275 static int tpmi_read_feature_status(struct intel_tpmi_info *tpmi_info, int feature_id,
276 struct tpmi_feature_state *feature_state)
281 if (!tpmi_info->tpmi_control_mem)
284 mutex_lock(&tpmi_dev_lock);
286 /* Wait for owner bit set to 0 (none) */
287 ret = tpmi_wait_for_owner(tpmi_info, TPMI_OWNER_NONE);
291 /* set command id to 0x10 for TPMI_GET_STATE */
292 data = FIELD_PREP(TMPI_CONTROL_DATA_CMD, TPMI_CONTROL_GET_STATE_CMD);
294 /* 32 bits for DATA offset and +8 for feature_id field */
295 data |= FIELD_PREP(TPMI_CONTROL_DATA_VAL_FEATURE, feature_id);
297 /* Write at command offset for qword access */
298 writeq(data, tpmi_info->tpmi_control_mem + TPMI_COMMAND_OFFSET);
300 /* Wait for owner bit set to in-band */
301 ret = tpmi_wait_for_owner(tpmi_info, TPMI_OWNER_IN_BAND);
305 /* Set Run Busy and packet length of 2 dwords */
306 control = TPMI_CONTROL_STATUS_RB;
307 control |= FIELD_PREP(TPMI_CONTROL_STATUS_LEN, TPMI_CMD_PKT_LEN);
309 /* Write at status offset for qword access */
310 writeq(control, tpmi_info->tpmi_control_mem + TPMI_CONTROL_STATUS_OFFSET);
312 /* Wait for Run Busy clear */
313 ret = readq_poll_timeout(tpmi_info->tpmi_control_mem + TPMI_CONTROL_STATUS_OFFSET,
314 control, !(control & TPMI_CONTROL_STATUS_RB),
315 TPMI_RB_TIMEOUT_US, TPMI_RB_TIMEOUT_MAX_US);
319 control = FIELD_GET(TPMI_CONTROL_STATUS_RESULT, control);
320 if (control != TPMI_CMD_STATUS_SUCCESS) {
325 /* Response is ready */
326 memcpy_fromio(feature_state, tpmi_info->tpmi_control_mem + TMPI_CONTROL_DATA_VAL_OFFSET,
327 sizeof(*feature_state));
332 /* Set CPL "completion" bit */
333 writeq(TPMI_CONTROL_STATUS_CPL, tpmi_info->tpmi_control_mem + TPMI_CONTROL_STATUS_OFFSET);
336 mutex_unlock(&tpmi_dev_lock);
341 int tpmi_get_feature_status(struct auxiliary_device *auxdev,
342 int feature_id, bool *read_blocked, bool *write_blocked)
344 struct intel_vsec_device *intel_vsec_dev = dev_to_ivdev(auxdev->dev.parent);
345 struct intel_tpmi_info *tpmi_info = auxiliary_get_drvdata(&intel_vsec_dev->auxdev);
346 struct tpmi_feature_state feature_state;
349 ret = tpmi_read_feature_status(tpmi_info, feature_id, &feature_state);
353 *read_blocked = feature_state.read_blocked;
354 *write_blocked = feature_state.write_blocked;
358 EXPORT_SYMBOL_NS_GPL(tpmi_get_feature_status, INTEL_TPMI);
360 static int tpmi_pfs_dbg_show(struct seq_file *s, void *unused)
362 struct intel_tpmi_info *tpmi_info = s->private;
363 int locked, disabled, read_blocked, write_blocked;
364 struct tpmi_feature_state feature_state;
365 struct intel_tpmi_pm_feature *pfs;
369 seq_printf(s, "tpmi PFS start offset 0x:%llx\n", tpmi_info->pfs_start);
370 seq_puts(s, "tpmi_id\t\tentries\t\tsize\t\tcap_offset\tattribute\tvsec_offset\tlocked\tdisabled\tread_blocked\twrite_blocked\n");
371 for (i = 0; i < tpmi_info->feature_count; ++i) {
372 pfs = &tpmi_info->tpmi_features[i];
373 ret = tpmi_read_feature_status(tpmi_info, pfs->pfs_header.tpmi_id, &feature_state);
380 disabled = feature_state.enabled ? 'N' : 'Y';
381 locked = feature_state.locked ? 'Y' : 'N';
382 read_blocked = feature_state.read_blocked ? 'Y' : 'N';
383 write_blocked = feature_state.write_blocked ? 'Y' : 'N';
385 seq_printf(s, "0x%02x\t\t0x%02x\t\t0x%04x\t\t0x%04x\t\t0x%02x\t\t0x%016llx\t%c\t%c\t\t%c\t\t%c\n",
386 pfs->pfs_header.tpmi_id, pfs->pfs_header.num_entries,
387 pfs->pfs_header.entry_size, pfs->pfs_header.cap_offset,
388 pfs->pfs_header.attribute, pfs->vsec_offset, locked, disabled,
389 read_blocked, write_blocked);
394 DEFINE_SHOW_ATTRIBUTE(tpmi_pfs_dbg);
396 #define MEM_DUMP_COLUMN_COUNT 8
398 static int tpmi_mem_dump_show(struct seq_file *s, void *unused)
400 size_t row_size = MEM_DUMP_COLUMN_COUNT * sizeof(u32);
401 struct intel_tpmi_pm_feature *pfs = s->private;
408 size = TPMI_GET_SINGLE_ENTRY_SIZE(pfs);
412 buffer = kmalloc(size, GFP_KERNEL);
416 off = pfs->vsec_offset;
418 mutex_lock(&tpmi_dev_lock);
420 for (count = 0; count < pfs->pfs_header.num_entries; ++count) {
421 seq_printf(s, "TPMI Instance:%d offset:0x%llx\n", count, off);
423 mem = ioremap(off, size);
429 memcpy_fromio(buffer, mem, size);
431 seq_hex_dump(s, " ", DUMP_PREFIX_OFFSET, row_size, sizeof(u32), buffer, size,
439 mutex_unlock(&tpmi_dev_lock);
445 DEFINE_SHOW_ATTRIBUTE(tpmi_mem_dump);
447 static ssize_t mem_write(struct file *file, const char __user *userbuf, size_t len, loff_t *ppos)
449 struct seq_file *m = file->private_data;
450 struct intel_tpmi_pm_feature *pfs = m->private;
451 u32 addr, value, punit, size;
452 u32 num_elems, *array;
456 size = TPMI_GET_SINGLE_ENTRY_SIZE(pfs);
460 ret = parse_int_array_user(userbuf, len, (int **)&array);
465 if (num_elems != 3) {
474 if (punit >= pfs->pfs_header.num_entries) {
484 mutex_lock(&tpmi_dev_lock);
486 mem = ioremap(pfs->vsec_offset + punit * size, size);
489 goto unlock_mem_write;
492 writel(value, mem + addr);
499 mutex_unlock(&tpmi_dev_lock);
507 static int mem_write_show(struct seq_file *s, void *unused)
512 static int mem_write_open(struct inode *inode, struct file *file)
514 return single_open(file, mem_write_show, inode->i_private);
517 static const struct file_operations mem_write_ops = {
518 .open = mem_write_open,
522 .release = single_release,
525 #define tpmi_to_dev(info) (&info->vsec_dev->pcidev->dev)
527 static void tpmi_dbgfs_register(struct intel_tpmi_info *tpmi_info)
532 snprintf(name, sizeof(name), "tpmi-%s", dev_name(tpmi_to_dev(tpmi_info)));
533 tpmi_info->dbgfs_dir = debugfs_create_dir(name, NULL);
535 debugfs_create_file("pfs_dump", 0444, tpmi_info->dbgfs_dir, tpmi_info, &tpmi_pfs_dbg_fops);
537 for (i = 0; i < tpmi_info->feature_count; ++i) {
538 struct intel_tpmi_pm_feature *pfs;
541 pfs = &tpmi_info->tpmi_features[i];
542 snprintf(name, sizeof(name), "tpmi-id-%02x", pfs->pfs_header.tpmi_id);
543 dir = debugfs_create_dir(name, tpmi_info->dbgfs_dir);
545 debugfs_create_file("mem_dump", 0444, dir, pfs, &tpmi_mem_dump_fops);
546 debugfs_create_file("mem_write", 0644, dir, pfs, &mem_write_ops);
550 static void tpmi_set_control_base(struct auxiliary_device *auxdev,
551 struct intel_tpmi_info *tpmi_info,
552 struct intel_tpmi_pm_feature *pfs)
557 size = TPMI_GET_SINGLE_ENTRY_SIZE(pfs);
561 mem = devm_ioremap(&auxdev->dev, pfs->vsec_offset, size);
565 /* mem is pointing to TPMI CONTROL base */
566 tpmi_info->tpmi_control_mem = mem;
569 static const char *intel_tpmi_name(enum intel_tpmi_id id)
585 /* String Length for tpmi-"feature_name(upto 8 bytes)" */
586 #define TPMI_FEATURE_NAME_LEN 14
588 static int tpmi_create_device(struct intel_tpmi_info *tpmi_info,
589 struct intel_tpmi_pm_feature *pfs,
592 struct intel_vsec_device *vsec_dev = tpmi_info->vsec_dev;
593 char feature_id_name[TPMI_FEATURE_NAME_LEN];
594 struct intel_vsec_device *feature_vsec_dev;
595 struct tpmi_feature_state feature_state;
596 struct resource *res, *tmp;
600 ret = tpmi_read_feature_status(tpmi_info, pfs->pfs_header.tpmi_id, &feature_state);
605 * If not enabled, continue to look at other features in the PFS, so return -EOPNOTSUPP.
606 * This will not cause failure of loading of this driver.
608 if (!feature_state.enabled)
611 name = intel_tpmi_name(pfs->pfs_header.tpmi_id);
615 res = kcalloc(pfs->pfs_header.num_entries, sizeof(*res), GFP_KERNEL);
619 feature_vsec_dev = kzalloc(sizeof(*feature_vsec_dev), GFP_KERNEL);
620 if (!feature_vsec_dev) {
625 snprintf(feature_id_name, sizeof(feature_id_name), "tpmi-%s", name);
627 for (i = 0, tmp = res; i < pfs->pfs_header.num_entries; i++, tmp++) {
628 u64 entry_size_bytes = pfs->pfs_header.entry_size * sizeof(u32);
630 tmp->start = pfs->vsec_offset + entry_size_bytes * i;
631 tmp->end = tmp->start + entry_size_bytes - 1;
632 tmp->flags = IORESOURCE_MEM;
635 feature_vsec_dev->pcidev = vsec_dev->pcidev;
636 feature_vsec_dev->resource = res;
637 feature_vsec_dev->num_resources = pfs->pfs_header.num_entries;
638 feature_vsec_dev->priv_data = &tpmi_info->plat_info;
639 feature_vsec_dev->priv_data_size = sizeof(tpmi_info->plat_info);
640 feature_vsec_dev->ida = &intel_vsec_tpmi_ida;
643 * intel_vsec_add_aux() is resource managed, no explicit
644 * delete is required on error or on module unload.
645 * feature_vsec_dev and res memory are also freed as part of
648 return intel_vsec_add_aux(vsec_dev->pcidev, &vsec_dev->auxdev.dev,
649 feature_vsec_dev, feature_id_name);
652 static int tpmi_create_devices(struct intel_tpmi_info *tpmi_info)
654 struct intel_vsec_device *vsec_dev = tpmi_info->vsec_dev;
657 for (i = 0; i < vsec_dev->num_resources; i++) {
658 ret = tpmi_create_device(tpmi_info, &tpmi_info->tpmi_features[i],
659 tpmi_info->pfs_start);
661 * Fail, if the supported features fails to create device,
662 * otherwise, continue. Even if one device failed to create,
663 * fail the loading of driver. Since intel_vsec_add_aux()
664 * is resource managed, no clean up is required for the
665 * successfully created devices.
667 if (ret && ret != -EOPNOTSUPP)
674 #define TPMI_INFO_BUS_INFO_OFFSET 0x08
675 #define TPMI_INFO_MAJOR_VERSION 0x00
676 #define TPMI_INFO_MINOR_VERSION 0x02
678 static int tpmi_process_info(struct intel_tpmi_info *tpmi_info,
679 struct intel_tpmi_pm_feature *pfs)
681 struct tpmi_info_header header;
682 void __iomem *info_mem;
686 info_mem = ioremap(pfs->vsec_offset, pfs->pfs_header.entry_size * sizeof(u32));
690 feature_header = readq(info_mem);
691 if (TPMI_MAJOR_VERSION(feature_header) != TPMI_INFO_MAJOR_VERSION) {
693 goto error_info_header;
696 memcpy_fromio(&header, info_mem + TPMI_INFO_BUS_INFO_OFFSET, sizeof(header));
698 tpmi_info->plat_info.package_id = header.pkg;
699 tpmi_info->plat_info.bus_number = header.bus;
700 tpmi_info->plat_info.device_number = header.dev;
701 tpmi_info->plat_info.function_number = header.fn;
703 if (TPMI_MINOR_VERSION(feature_header) >= TPMI_INFO_MINOR_VERSION) {
704 tpmi_info->plat_info.cdie_mask = header.cdie_mask;
705 tpmi_info->plat_info.partition = header.partition;
706 tpmi_info->plat_info.segment = header.segment;
715 static int tpmi_fetch_pfs_header(struct intel_tpmi_pm_feature *pfs, u64 start, int size)
717 void __iomem *pfs_mem;
719 pfs_mem = ioremap(start, size);
723 memcpy_fromio(&pfs->pfs_header, pfs_mem, sizeof(pfs->pfs_header));
730 #define TPMI_CAP_OFFSET_UNIT 1024
732 static int intel_vsec_tpmi_init(struct auxiliary_device *auxdev)
734 struct intel_vsec_device *vsec_dev = auxdev_to_ivdev(auxdev);
735 struct pci_dev *pci_dev = vsec_dev->pcidev;
736 struct intel_tpmi_info *tpmi_info;
740 tpmi_info = devm_kzalloc(&auxdev->dev, sizeof(*tpmi_info), GFP_KERNEL);
744 tpmi_info->vsec_dev = vsec_dev;
745 tpmi_info->feature_count = vsec_dev->num_resources;
746 tpmi_info->plat_info.bus_number = pci_dev->bus->number;
748 tpmi_info->tpmi_features = devm_kcalloc(&auxdev->dev, vsec_dev->num_resources,
749 sizeof(*tpmi_info->tpmi_features),
751 if (!tpmi_info->tpmi_features)
754 for (i = 0; i < vsec_dev->num_resources; i++) {
755 struct intel_tpmi_pm_feature *pfs;
756 struct resource *res;
760 pfs = &tpmi_info->tpmi_features[i];
761 pfs->vsec_dev = vsec_dev;
763 res = &vsec_dev->resource[i];
767 res_start = res->start;
768 size = resource_size(res);
772 ret = tpmi_fetch_pfs_header(pfs, res_start, size);
777 pfs_start = res_start;
779 pfs->vsec_offset = pfs_start + pfs->pfs_header.cap_offset * TPMI_CAP_OFFSET_UNIT;
782 * Process TPMI_INFO to get PCI device to CPU package ID.
783 * Device nodes for TPMI features are not created in this
784 * for loop. So, the mapping information will be available
785 * when actual device nodes created outside this
786 * loop via tpmi_create_devices().
788 if (pfs->pfs_header.tpmi_id == TPMI_INFO_ID) {
789 ret = tpmi_process_info(tpmi_info, pfs);
794 if (pfs->pfs_header.tpmi_id == TPMI_CONTROL_ID)
795 tpmi_set_control_base(auxdev, tpmi_info, pfs);
798 tpmi_info->pfs_start = pfs_start;
800 auxiliary_set_drvdata(auxdev, tpmi_info);
802 ret = tpmi_create_devices(tpmi_info);
807 * Allow debugfs when security policy allows. Everything this debugfs
808 * interface provides, can also be done via /dev/mem access. If
809 * /dev/mem interface is locked, don't allow debugfs to present any
810 * information. Also check for CAP_SYS_RAWIO as /dev/mem interface.
812 if (!security_locked_down(LOCKDOWN_DEV_MEM) && capable(CAP_SYS_RAWIO))
813 tpmi_dbgfs_register(tpmi_info);
818 static int tpmi_probe(struct auxiliary_device *auxdev,
819 const struct auxiliary_device_id *id)
821 return intel_vsec_tpmi_init(auxdev);
824 static void tpmi_remove(struct auxiliary_device *auxdev)
826 struct intel_tpmi_info *tpmi_info = auxiliary_get_drvdata(auxdev);
828 debugfs_remove_recursive(tpmi_info->dbgfs_dir);
831 static const struct auxiliary_device_id tpmi_id_table[] = {
832 { .name = "intel_vsec.tpmi" },
835 MODULE_DEVICE_TABLE(auxiliary, tpmi_id_table);
837 static struct auxiliary_driver tpmi_aux_driver = {
838 .id_table = tpmi_id_table,
840 .remove = tpmi_remove,
843 module_auxiliary_driver(tpmi_aux_driver);
845 MODULE_IMPORT_NS(INTEL_VSEC);
846 MODULE_DESCRIPTION("Intel TPMI enumeration module");
847 MODULE_LICENSE("GPL");