drivers/crypto/ccp/hsti.c

Source file repositories/reference/linux-study-clean/drivers/crypto/ccp/hsti.c

File Facts

System
Linux kernel
Corpus path
drivers/crypto/ccp/hsti.c
Extension
.c
Size
3674 bytes
Lines
142
Domain
Driver Families
Bucket
drivers/crypto
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 hsti_request {
	struct psp_req_buffer_hdr header;
	u32 hsti;
} __packed;

#define security_attribute_show(name)						\
static ssize_t name##_show(struct device *d, struct device_attribute *attr,	\
			   char *buf)						\
{										\
	struct sp_device *sp = dev_get_drvdata(d);				\
	struct psp_device *psp = sp->psp_data;					\
	return sysfs_emit(buf, "%d\n", psp->capability.name);		\
}

security_attribute_show(fused_part)
static DEVICE_ATTR_RO(fused_part);
security_attribute_show(boot_integrity)
static DEVICE_ATTR_RO(boot_integrity);
security_attribute_show(debug_lock_on)
static DEVICE_ATTR_RO(debug_lock_on);
security_attribute_show(tsme_status)
static DEVICE_ATTR_RO(tsme_status);
security_attribute_show(anti_rollback_status)
static DEVICE_ATTR_RO(anti_rollback_status);
security_attribute_show(rpmc_production_enabled)
static DEVICE_ATTR_RO(rpmc_production_enabled);
security_attribute_show(rpmc_spirom_available)
static DEVICE_ATTR_RO(rpmc_spirom_available);
security_attribute_show(hsp_tpm_available)
static DEVICE_ATTR_RO(hsp_tpm_available);
security_attribute_show(rom_armor_enforced)
static DEVICE_ATTR_RO(rom_armor_enforced);

static struct attribute *psp_security_attrs[] = {
	&dev_attr_fused_part.attr,
	&dev_attr_boot_integrity.attr,
	&dev_attr_debug_lock_on.attr,
	&dev_attr_tsme_status.attr,
	&dev_attr_anti_rollback_status.attr,
	&dev_attr_rpmc_production_enabled.attr,
	&dev_attr_rpmc_spirom_available.attr,
	&dev_attr_hsp_tpm_available.attr,
	&dev_attr_rom_armor_enforced.attr,
	NULL
};

static umode_t psp_security_is_visible(struct kobject *kobj, struct attribute *attr, int idx)
{
	struct device *dev = kobj_to_dev(kobj);
	struct sp_device *sp = dev_get_drvdata(dev);
	struct psp_device *psp = sp->psp_data;

	if (psp && psp->capability.security_reporting)
		return 0444;

	return 0;
}

struct attribute_group psp_security_attr_group = {
	.attrs = psp_security_attrs,
	.is_visible = psp_security_is_visible,
};

static int psp_populate_hsti(struct psp_device *psp)
{
	struct hsti_request *req;
	int ret;

	/* Are the security attributes already reported? */
	if (psp->capability.security_reporting)
		return 0;

	/* Allocate command-response buffer */
	req = kzalloc_obj(*req);
	if (!req)
		return -ENOMEM;

	req->header.payload_size = sizeof(*req);

	ret = psp_send_platform_access_msg(PSP_CMD_HSTI_QUERY, (struct psp_request *)req);
	if (ret)
		goto out;

	if (req->header.status != 0) {
		dev_dbg(psp->dev, "failed to populate HSTI state: %d\n", req->header.status);
		ret = -EINVAL;
		goto out;
	}

	psp->capability.security_reporting = 1;

Annotation

Implementation Notes