1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0
246ba51eaSHanjun Guo /*
346ba51eaSHanjun Guo * Copyright (C) 2005 Intel Corporation
446ba51eaSHanjun Guo * Copyright (C) 2009 Hewlett-Packard Development Company, L.P.
546ba51eaSHanjun Guo *
646ba51eaSHanjun Guo * Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
746ba51eaSHanjun Guo * - Added _PDC for platforms with Intel CPUs
846ba51eaSHanjun Guo */
946ba51eaSHanjun Guo
1046ba51eaSHanjun Guo #define pr_fmt(fmt) "ACPI: " fmt
1146ba51eaSHanjun Guo
1246ba51eaSHanjun Guo #include <linux/slab.h>
1346ba51eaSHanjun Guo #include <linux/acpi.h>
1446ba51eaSHanjun Guo #include <acpi/processor.h>
1546ba51eaSHanjun Guo
1646ba51eaSHanjun Guo #include "internal.h"
1746ba51eaSHanjun Guo
acpi_set_pdc_bits(u32 * buf)1846ba51eaSHanjun Guo static void acpi_set_pdc_bits(u32 *buf)
1946ba51eaSHanjun Guo {
2046ba51eaSHanjun Guo buf[0] = ACPI_PDC_REVISION_ID;
2146ba51eaSHanjun Guo buf[1] = 1;
22*b2eb3e67SMichal Wilczynski buf[2] = 0;
2346ba51eaSHanjun Guo
2446ba51eaSHanjun Guo /* Twiddle arch-specific bits needed for _PDC */
25c5e4d05dSMichal Wilczynski arch_acpi_set_proc_cap_bits(&buf[2]);
2646ba51eaSHanjun Guo }
2746ba51eaSHanjun Guo
acpi_processor_alloc_pdc(void)2846ba51eaSHanjun Guo static struct acpi_object_list *acpi_processor_alloc_pdc(void)
2946ba51eaSHanjun Guo {
3046ba51eaSHanjun Guo struct acpi_object_list *obj_list;
3146ba51eaSHanjun Guo union acpi_object *obj;
3246ba51eaSHanjun Guo u32 *buf;
3346ba51eaSHanjun Guo
3446ba51eaSHanjun Guo /* allocate and initialize pdc. It will be used later. */
3546ba51eaSHanjun Guo obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
3646ba51eaSHanjun Guo if (!obj_list)
3746ba51eaSHanjun Guo goto out;
3846ba51eaSHanjun Guo
3946ba51eaSHanjun Guo obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
4046ba51eaSHanjun Guo if (!obj) {
4146ba51eaSHanjun Guo kfree(obj_list);
4246ba51eaSHanjun Guo goto out;
4346ba51eaSHanjun Guo }
4446ba51eaSHanjun Guo
4546ba51eaSHanjun Guo buf = kmalloc(12, GFP_KERNEL);
4646ba51eaSHanjun Guo if (!buf) {
4746ba51eaSHanjun Guo kfree(obj);
4846ba51eaSHanjun Guo kfree(obj_list);
4946ba51eaSHanjun Guo goto out;
5046ba51eaSHanjun Guo }
5146ba51eaSHanjun Guo
5246ba51eaSHanjun Guo acpi_set_pdc_bits(buf);
5346ba51eaSHanjun Guo
5446ba51eaSHanjun Guo obj->type = ACPI_TYPE_BUFFER;
5546ba51eaSHanjun Guo obj->buffer.length = 12;
5646ba51eaSHanjun Guo obj->buffer.pointer = (u8 *) buf;
5746ba51eaSHanjun Guo obj_list->count = 1;
5846ba51eaSHanjun Guo obj_list->pointer = obj;
5946ba51eaSHanjun Guo
6046ba51eaSHanjun Guo return obj_list;
6146ba51eaSHanjun Guo out:
6246ba51eaSHanjun Guo pr_err("Memory allocation error\n");
6346ba51eaSHanjun Guo return NULL;
6446ba51eaSHanjun Guo }
6546ba51eaSHanjun Guo
6646ba51eaSHanjun Guo /*
6746ba51eaSHanjun Guo * _PDC is required for a BIOS-OS handshake for most of the newer
6846ba51eaSHanjun Guo * ACPI processor features.
6946ba51eaSHanjun Guo */
7046ba51eaSHanjun Guo static acpi_status
acpi_processor_eval_pdc(acpi_handle handle,struct acpi_object_list * pdc_in)7146ba51eaSHanjun Guo acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
7246ba51eaSHanjun Guo {
7346ba51eaSHanjun Guo acpi_status status = AE_OK;
7446ba51eaSHanjun Guo
7546ba51eaSHanjun Guo status = acpi_evaluate_object(handle, "_PDC", pdc_in, NULL);
7646ba51eaSHanjun Guo
7746ba51eaSHanjun Guo if (ACPI_FAILURE(status))
7852af99c3SRafael J. Wysocki acpi_handle_debug(handle,
7952af99c3SRafael J. Wysocki "Could not evaluate _PDC, using legacy perf control\n");
8046ba51eaSHanjun Guo
8146ba51eaSHanjun Guo return status;
8246ba51eaSHanjun Guo }
8346ba51eaSHanjun Guo
acpi_processor_set_pdc(acpi_handle handle)8446ba51eaSHanjun Guo void acpi_processor_set_pdc(acpi_handle handle)
8546ba51eaSHanjun Guo {
8646ba51eaSHanjun Guo struct acpi_object_list *obj_list;
8746ba51eaSHanjun Guo
8846ba51eaSHanjun Guo if (arch_has_acpi_pdc() == false)
8946ba51eaSHanjun Guo return;
9046ba51eaSHanjun Guo
9146ba51eaSHanjun Guo obj_list = acpi_processor_alloc_pdc();
9246ba51eaSHanjun Guo if (!obj_list)
9346ba51eaSHanjun Guo return;
9446ba51eaSHanjun Guo
9546ba51eaSHanjun Guo acpi_processor_eval_pdc(handle, obj_list);
9646ba51eaSHanjun Guo
9746ba51eaSHanjun Guo kfree(obj_list->pointer->buffer.pointer);
9846ba51eaSHanjun Guo kfree(obj_list->pointer);
9946ba51eaSHanjun Guo kfree(obj_list);
10046ba51eaSHanjun Guo }
10146ba51eaSHanjun Guo
10246ba51eaSHanjun Guo static acpi_status __init
early_init_pdc(acpi_handle handle,u32 lvl,void * context,void ** rv)10346ba51eaSHanjun Guo early_init_pdc(acpi_handle handle, u32 lvl, void *context, void **rv)
10446ba51eaSHanjun Guo {
10546ba51eaSHanjun Guo if (processor_physically_present(handle) == false)
10646ba51eaSHanjun Guo return AE_OK;
10746ba51eaSHanjun Guo
10846ba51eaSHanjun Guo acpi_processor_set_pdc(handle);
10946ba51eaSHanjun Guo return AE_OK;
11046ba51eaSHanjun Guo }
11146ba51eaSHanjun Guo
acpi_early_processor_set_pdc(void)11246ba51eaSHanjun Guo void __init acpi_early_processor_set_pdc(void)
11346ba51eaSHanjun Guo {
1140a0e2ea6SMichal Wilczynski acpi_proc_quirk_mwait_check();
11546ba51eaSHanjun Guo
11646ba51eaSHanjun Guo acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT,
11746ba51eaSHanjun Guo ACPI_UINT32_MAX,
11846ba51eaSHanjun Guo early_init_pdc, NULL, NULL, NULL);
11946ba51eaSHanjun Guo acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, early_init_pdc, NULL, NULL);
12046ba51eaSHanjun Guo }
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