cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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common.c (1873B)

      1// SPDX-License-Identifier: GPL-2.0
      2/* Author: Dan Scally <djrscally@gmail.com> */
      3
      4#include <linux/acpi.h>
      5#include <linux/slab.h>
      6
      7#include "common.h"
      8
      9union acpi_object *skl_int3472_get_acpi_buffer(struct acpi_device *adev, char *id)
     10{
     11	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
     12	acpi_handle handle = adev->handle;
     13	union acpi_object *obj;
     14	acpi_status status;
     15
     16	status = acpi_evaluate_object(handle, id, NULL, &buffer);
     17	if (ACPI_FAILURE(status))
     18		return ERR_PTR(-ENODEV);
     19
     20	obj = buffer.pointer;
     21	if (!obj)
     22		return ERR_PTR(-ENODEV);
     23
     24	if (obj->type != ACPI_TYPE_BUFFER) {
     25		acpi_handle_err(handle, "%s object is not an ACPI buffer\n", id);
     26		kfree(obj);
     27		return ERR_PTR(-EINVAL);
     28	}
     29
     30	return obj;
     31}
     32
     33int skl_int3472_fill_cldb(struct acpi_device *adev, struct int3472_cldb *cldb)
     34{
     35	union acpi_object *obj;
     36	int ret;
     37
     38	obj = skl_int3472_get_acpi_buffer(adev, "CLDB");
     39	if (IS_ERR(obj))
     40		return PTR_ERR(obj);
     41
     42	if (obj->buffer.length > sizeof(*cldb)) {
     43		acpi_handle_err(adev->handle, "The CLDB buffer is too large\n");
     44		ret = -EINVAL;
     45		goto out_free_obj;
     46	}
     47
     48	memcpy(cldb, obj->buffer.pointer, obj->buffer.length);
     49	ret = 0;
     50
     51out_free_obj:
     52	kfree(obj);
     53	return ret;
     54}
     55
     56/* sensor_adev_ret may be NULL, name_ret must not be NULL */
     57int skl_int3472_get_sensor_adev_and_name(struct device *dev,
     58					 struct acpi_device **sensor_adev_ret,
     59					 const char **name_ret)
     60{
     61	struct acpi_device *adev = ACPI_COMPANION(dev);
     62	struct acpi_device *sensor;
     63	int ret = 0;
     64
     65	sensor = acpi_dev_get_first_consumer_dev(adev);
     66	if (!sensor) {
     67		dev_err(dev, "INT3472 seems to have no dependents.\n");
     68		return -ENODEV;
     69	}
     70
     71	*name_ret = devm_kasprintf(dev, GFP_KERNEL, I2C_DEV_NAME_FORMAT,
     72				   acpi_dev_name(sensor));
     73	if (!*name_ret)
     74		ret = -ENOMEM;
     75
     76	if (ret == 0 && sensor_adev_ret)
     77		*sensor_adev_ret = sensor;
     78	else
     79		acpi_dev_put(sensor);
     80
     81	return ret;
     82}