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// SPDX-License-Identifier: GPL-2.0-only
/*
* Intel PMC PWRM ACPI driver
*
* Copyright (C) 2025, Intel Corporation
*/
#include <linux/acpi.h>
#include <linux/bits.h>
#include <linux/bitfield.h>
#include <linux/cleanup.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/intel_vsec.h>
#include <linux/limits.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/resource.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/uuid.h>
#include "core.h"
#define ENTRY_LEN 5
/* DWORD2 */
#define DVSEC_ID_MASK GENMASK(15, 0)
#define NUM_ENTRIES_MASK GENMASK(23, 16)
#define ENTRY_SIZE_MASK GENMASK(31, 24)
/* DWORD3 */
#define TBIR_MASK GENMASK(2, 0)
#define DISC_TBL_OFF_MASK GENMASK(31, 3)
const guid_t intel_vsec_guid =
GUID_INIT(0x294903fb, 0x634d, 0x4fc7, 0xaf, 0x1f, 0x0f, 0xb9,
0x56, 0xb0, 0x4f, 0xc1);
static bool is_valid_entry(union acpi_object *pkg)
{
int i;
if (!pkg || pkg->type != ACPI_TYPE_PACKAGE || pkg->package.count != ENTRY_LEN)
return false;
if (pkg->package.elements[0].type != ACPI_TYPE_STRING)
return false;
for (i = 1; i < ENTRY_LEN; i++)
if (pkg->package.elements[i].type != ACPI_TYPE_INTEGER)
return false;
return true;
}
acpi_disc_t pmc_parse_telem_dsd(union acpi_object *obj,
struct intel_vsec_header *header)
{
union acpi_object *vsec_pkg;
union acpi_object *disc_pkg;
u64 hdr0, hdr1;
int num_regions;
int i;
if (!header)
return ERR_PTR(-EINVAL);
if (!obj || obj->type != ACPI_TYPE_PACKAGE || obj->package.count != 2)
return ERR_PTR(-EINVAL);
/* First Package is DVSEC info */
vsec_pkg = &obj->package.elements[0];
if (!is_valid_entry(vsec_pkg))
return ERR_PTR(-EINVAL);
hdr0 = vsec_pkg->package.elements[3].integer.value;
hdr1 = vsec_pkg->package.elements[4].integer.value;
header->id = FIELD_GET(DVSEC_ID_MASK, hdr0);
header->num_entries = FIELD_GET(NUM_ENTRIES_MASK, hdr0);
header->entry_size = FIELD_GET(ENTRY_SIZE_MASK, hdr0);
header->tbir = FIELD_GET(TBIR_MASK, hdr1);
header->offset = hdr1 & DISC_TBL_OFF_MASK;
/* Second Package contains the discovery tables */
disc_pkg = &obj->package.elements[1];
if (disc_pkg->type != ACPI_TYPE_PACKAGE || disc_pkg->package.count < 1)
return ERR_PTR(-EINVAL);
num_regions = disc_pkg->package.count;
if (header->num_entries != num_regions)
return ERR_PTR(-EINVAL);
acpi_disc_t disc __free(kfree) = kmalloc_array(num_regions, sizeof(*disc),
GFP_KERNEL);
if (!disc)
return ERR_PTR(-ENOMEM);
for (i = 0; i < num_regions; i++) {
union acpi_object *pkg;
u64 value;
int j;
pkg = &disc_pkg->package.elements[i];
if (!is_valid_entry(pkg))
return ERR_PTR(-EINVAL);
/* Element 0 is a descriptive string; DWORD values start at index 1. */
for (j = 1; j < ENTRY_LEN; j++) {
value = pkg->package.elements[j].integer.value;
if (value > U32_MAX)
return ERR_PTR(-ERANGE);
disc[i][j - 1] = value;
}
}
return no_free_ptr(disc);
}
EXPORT_SYMBOL_NS_GPL(pmc_parse_telem_dsd, "INTEL_PMC_CORE");
union acpi_object *pmc_find_telem_guid(union acpi_object *dsd)
{
int i;
if (!dsd || dsd->type != ACPI_TYPE_PACKAGE)
return NULL;
for (i = 0; i + 1 < dsd->package.count; i += 2) {
union acpi_object *uuid_obj, *data_obj;
guid_t uuid;
uuid_obj = &dsd->package.elements[i];
data_obj = &dsd->package.elements[i + 1];
if (uuid_obj->type != ACPI_TYPE_BUFFER ||
uuid_obj->buffer.length != 16)
continue;
memcpy(&uuid, uuid_obj->buffer.pointer, 16);
if (guid_equal(&uuid, &intel_vsec_guid))
return data_obj;
}
return NULL;
}
EXPORT_SYMBOL_NS_GPL(pmc_find_telem_guid, "INTEL_PMC_CORE");
static int pmc_pwrm_acpi_probe(struct platform_device *pdev)
{
struct intel_vsec_header header;
struct intel_vsec_header *headers[2] = { &header, NULL };
struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
struct intel_vsec_platform_info info = { };
struct device *dev = &pdev->dev;
union acpi_object *dsd;
struct resource *res;
acpi_handle handle;
acpi_status status;
handle = ACPI_HANDLE(&pdev->dev);
if (!handle)
return -ENODEV;
status = acpi_evaluate_object(handle, "_DSD", NULL, &buf);
if (ACPI_FAILURE(status)) {
return dev_err_probe(dev, -ENODEV, "Could not evaluate _DSD: %s\n",
acpi_format_exception(status));
}
void *dsd_buf __free(pmc_acpi_free) = buf.pointer;
dsd = pmc_find_telem_guid(dsd_buf);
if (!dsd)
return -ENODEV;
acpi_disc_t acpi_disc __free(kfree) = pmc_parse_telem_dsd(dsd, &header);
if (IS_ERR(acpi_disc))
return PTR_ERR(acpi_disc);
res = platform_get_resource(pdev, IORESOURCE_MEM, header.tbir);
if (!res)
return -EINVAL;
info.headers = headers;
info.caps = VSEC_CAP_TELEMETRY;
info.acpi_disc = acpi_disc;
info.src = INTEL_VSEC_DISC_ACPI;
info.base_addr = res->start;
return intel_vsec_register(&pdev->dev, &info);
}
static const struct acpi_device_id pmc_pwrm_acpi_ids[] = {
{ "INTC1122", 0 }, /* Nova Lake */
{ "INTC1129", 0 }, /* Nova Lake */
{ }
};
MODULE_DEVICE_TABLE(acpi, pmc_pwrm_acpi_ids);
static struct platform_driver pmc_pwrm_acpi_driver = {
.probe = pmc_pwrm_acpi_probe,
.driver = {
.name = "intel_pmc_pwrm_acpi",
.acpi_match_table = ACPI_PTR(pmc_pwrm_acpi_ids),
},
};
module_platform_driver(pmc_pwrm_acpi_driver);
MODULE_AUTHOR("David E. Box <david.e.box@linux.intel.com>");
MODULE_DESCRIPTION("Intel PMC PWRM ACPI driver");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS("INTEL_VSEC");
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