drivers/platform/x86/amd/x3d_vcache.c

Source file repositories/reference/linux-study-clean/drivers/platform/x86/amd/x3d_vcache.c

File Facts

System
Linux kernel
Corpus path
drivers/platform/x86/amd/x3d_vcache.c
Extension
.c
Size
4158 bytes
Lines
177
Domain
Driver Families
Bucket
drivers/platform
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct amd_x3d_dev {
	struct device *dev;
	acpi_handle ahandle;
	/* To protect x3d mode setting */
	struct mutex lock;
	enum amd_x3d_mode_type curr_mode;
};

static int amd_x3d_get_mode(struct amd_x3d_dev *data)
{
	guard(mutex)(&data->lock);

	return data->curr_mode;
}

static int amd_x3d_mode_switch(struct amd_x3d_dev *data, int new_state)
{
	union acpi_object *out, argv;

	guard(mutex)(&data->lock);
	argv.type = ACPI_TYPE_INTEGER;
	argv.integer.value = new_state;

	out = acpi_evaluate_dsm(data->ahandle, &x3d_guid, DSM_REVISION_ID,
				DSM_SET_X3D_MODE, &argv);
	if (!out) {
		dev_err(data->dev, "failed to evaluate _DSM\n");
		return -EINVAL;
	}

	data->curr_mode = new_state;

	kfree(out);

	return 0;
}

static ssize_t amd_x3d_mode_store(struct device *dev, struct device_attribute *attr,
				  const char *buf, size_t count)
{
	struct amd_x3d_dev *data = dev_get_drvdata(dev);
	int ret;

	ret = sysfs_match_string(amd_x3d_mode_strings, buf);
	if (ret < 0)
		return ret;

	ret = amd_x3d_mode_switch(data, ret);
	if (ret < 0)
		return ret;

	return count;
}

static ssize_t amd_x3d_mode_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct amd_x3d_dev *data = dev_get_drvdata(dev);
	int mode = amd_x3d_get_mode(data);

	return sysfs_emit(buf, "%s\n", amd_x3d_mode_strings[mode]);
}
static DEVICE_ATTR_RW(amd_x3d_mode);

static struct attribute *amd_x3d_attrs[] = {
	&dev_attr_amd_x3d_mode.attr,
	NULL
};
ATTRIBUTE_GROUPS(amd_x3d);

static int amd_x3d_resume_handler(struct device *dev)
{
	struct amd_x3d_dev *data = dev_get_drvdata(dev);
	int ret = amd_x3d_get_mode(data);

	return amd_x3d_mode_switch(data, ret);
}

static DEFINE_SIMPLE_DEV_PM_OPS(amd_x3d_pm, NULL, amd_x3d_resume_handler);

static const struct acpi_device_id amd_x3d_acpi_ids[] = {
	{"AMDI0101"},
	{ },
};
MODULE_DEVICE_TABLE(acpi, amd_x3d_acpi_ids);

static int amd_x3d_probe(struct platform_device *pdev)
{
	struct amd_x3d_dev *data;
	acpi_handle handle;
	int ret;

Annotation

Implementation Notes