#include <linux/auxiliary_bus.h>
#include <linux/bitfield.h>
+#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/intel_tpmi.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/pci.h>
+#include <linux/security.h>
#include <linux/sizes.h>
+#include <linux/string_helpers.h>
#include "vsec.h"
* @vsec_offset: Starting MMIO address for this feature in bytes. Essentially
* this offset = "Address" from VSEC header + PFS Capability
* offset for this feature entry.
+ * @vsec_dev: Pointer to intel_vsec_device structure for this TPMI device
*
* Represents TPMI instance information for one TPMI ID.
*/
struct intel_tpmi_pm_feature {
struct intel_tpmi_pfs_entry pfs_header;
unsigned int vsec_offset;
+ struct intel_vsec_device *vsec_dev;
};
/**
* @pfs_start: Start of PFS offset for the TPMI instances in this device
* @plat_info: Stores platform info which can be used by the client drivers
* @tpmi_control_mem: Memory mapped IO for getting control information
+ * @dbgfs_dir: debugfs entry pointer
*
* Stores the information for all TPMI devices enumerated from a single PCI device.
*/
u64 pfs_start;
struct intel_tpmi_plat_info plat_info;
void __iomem *tpmi_control_mem;
+ struct dentry *dbgfs_dir;
};
/**
}
EXPORT_SYMBOL_NS_GPL(tpmi_get_feature_status, INTEL_TPMI);
+static int tpmi_pfs_dbg_show(struct seq_file *s, void *unused)
+{
+ struct intel_tpmi_info *tpmi_info = s->private;
+ struct intel_tpmi_pm_feature *pfs;
+ int locked, disabled, ret, i;
+
+ seq_printf(s, "tpmi PFS start offset 0x:%llx\n", tpmi_info->pfs_start);
+ seq_puts(s, "tpmi_id\t\tentries\t\tsize\t\tcap_offset\tattribute\tvsec_offset\tlocked\tdisabled\n");
+ for (i = 0; i < tpmi_info->feature_count; ++i) {
+ pfs = &tpmi_info->tpmi_features[i];
+ ret = tpmi_read_feature_status(tpmi_info, pfs->pfs_header.tpmi_id, &locked,
+ &disabled);
+ if (ret) {
+ locked = 'U';
+ disabled = 'U';
+ } else {
+ disabled = disabled ? 'Y' : 'N';
+ locked = locked ? 'Y' : 'N';
+ }
+ seq_printf(s, "0x%02x\t\t0x%02x\t\t0x%04x\t\t0x%04x\t\t0x%02x\t\t0x%08x\t%c\t%c\n",
+ pfs->pfs_header.tpmi_id, pfs->pfs_header.num_entries,
+ pfs->pfs_header.entry_size, pfs->pfs_header.cap_offset,
+ pfs->pfs_header.attribute, pfs->vsec_offset, locked, disabled);
+ }
+
+ return 0;
+}
+DEFINE_SHOW_ATTRIBUTE(tpmi_pfs_dbg);
+
+#define MEM_DUMP_COLUMN_COUNT 8
+
+static int tpmi_mem_dump_show(struct seq_file *s, void *unused)
+{
+ size_t row_size = MEM_DUMP_COLUMN_COUNT * sizeof(u32);
+ struct intel_tpmi_pm_feature *pfs = s->private;
+ int count, ret = 0;
+ void __iomem *mem;
+ u32 off, size;
+ u8 *buffer;
+
+ size = TPMI_GET_SINGLE_ENTRY_SIZE(pfs);
+ if (!size)
+ return -EIO;
+
+ buffer = kmalloc(size, GFP_KERNEL);
+ if (!buffer)
+ return -ENOMEM;
+
+ off = pfs->vsec_offset;
+
+ mutex_lock(&tpmi_dev_lock);
+
+ for (count = 0; count < pfs->pfs_header.num_entries; ++count) {
+ seq_printf(s, "TPMI Instance:%d offset:0x%x\n", count, off);
+
+ mem = ioremap(off, size);
+ if (!mem) {
+ ret = -ENOMEM;
+ break;
+ }
+
+ memcpy_fromio(buffer, mem, size);
+
+ seq_hex_dump(s, " ", DUMP_PREFIX_OFFSET, row_size, sizeof(u32), buffer, size,
+ false);
+
+ iounmap(mem);
+
+ off += size;
+ }
+
+ mutex_unlock(&tpmi_dev_lock);
+
+ kfree(buffer);
+
+ return ret;
+}
+DEFINE_SHOW_ATTRIBUTE(tpmi_mem_dump);
+
+static ssize_t mem_write(struct file *file, const char __user *userbuf, size_t len, loff_t *ppos)
+{
+ struct seq_file *m = file->private_data;
+ struct intel_tpmi_pm_feature *pfs = m->private;
+ u32 addr, value, punit, size;
+ u32 num_elems, *array;
+ void __iomem *mem;
+ int ret;
+
+ size = TPMI_GET_SINGLE_ENTRY_SIZE(pfs);
+ if (!size)
+ return -EIO;
+
+ ret = parse_int_array_user(userbuf, len, (int **)&array);
+ if (ret < 0)
+ return ret;
+
+ num_elems = *array;
+ if (num_elems != 3) {
+ ret = -EINVAL;
+ goto exit_write;
+ }
+
+ punit = array[1];
+ addr = array[2];
+ value = array[3];
+
+ if (punit >= pfs->pfs_header.num_entries) {
+ ret = -EINVAL;
+ goto exit_write;
+ }
+
+ if (addr >= size) {
+ ret = -EINVAL;
+ goto exit_write;
+ }
+
+ mutex_lock(&tpmi_dev_lock);
+
+ mem = ioremap(pfs->vsec_offset + punit * size, size);
+ if (!mem) {
+ ret = -ENOMEM;
+ goto unlock_mem_write;
+ }
+
+ writel(value, mem + addr);
+
+ iounmap(mem);
+
+ ret = len;
+
+unlock_mem_write:
+ mutex_unlock(&tpmi_dev_lock);
+
+exit_write:
+ kfree(array);
+
+ return ret;
+}
+
+static int mem_write_show(struct seq_file *s, void *unused)
+{
+ return 0;
+}
+
+static int mem_write_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, mem_write_show, inode->i_private);
+}
+
+static const struct file_operations mem_write_ops = {
+ .open = mem_write_open,
+ .read = seq_read,
+ .write = mem_write,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+#define tpmi_to_dev(info) (&info->vsec_dev->pcidev->dev)
+
+static void tpmi_dbgfs_register(struct intel_tpmi_info *tpmi_info)
+{
+ char name[64];
+ int i;
+
+ snprintf(name, sizeof(name), "tpmi-%s", dev_name(tpmi_to_dev(tpmi_info)));
+ tpmi_info->dbgfs_dir = debugfs_create_dir(name, NULL);
+
+ debugfs_create_file("pfs_dump", 0444, tpmi_info->dbgfs_dir, tpmi_info, &tpmi_pfs_dbg_fops);
+
+ for (i = 0; i < tpmi_info->feature_count; ++i) {
+ struct intel_tpmi_pm_feature *pfs;
+ struct dentry *dir;
+
+ pfs = &tpmi_info->tpmi_features[i];
+ snprintf(name, sizeof(name), "tpmi-id-%02x", pfs->pfs_header.tpmi_id);
+ dir = debugfs_create_dir(name, tpmi_info->dbgfs_dir);
+
+ debugfs_create_file("mem_dump", 0444, dir, pfs, &tpmi_mem_dump_fops);
+ debugfs_create_file("mem_write", 0644, dir, pfs, &mem_write_ops);
+ }
+}
+
static void tpmi_set_control_base(struct auxiliary_device *auxdev,
struct intel_tpmi_info *tpmi_info,
struct intel_tpmi_pm_feature *pfs)
struct pci_dev *pci_dev = vsec_dev->pcidev;
struct intel_tpmi_info *tpmi_info;
u64 pfs_start = 0;
- int i;
+ int ret, i;
tpmi_info = devm_kzalloc(&auxdev->dev, sizeof(*tpmi_info), GFP_KERNEL);
if (!tpmi_info)
int size, ret;
pfs = &tpmi_info->tpmi_features[i];
+ pfs->vsec_dev = vsec_dev;
res = &vsec_dev->resource[i];
if (!res)
auxiliary_set_drvdata(auxdev, tpmi_info);
- return tpmi_create_devices(tpmi_info);
+ ret = tpmi_create_devices(tpmi_info);
+ if (ret)
+ return ret;
+
+ /*
+ * Allow debugfs when security policy allows. Everything this debugfs
+ * interface provides, can also be done via /dev/mem access. If
+ * /dev/mem interface is locked, don't allow debugfs to present any
+ * information. Also check for CAP_SYS_RAWIO as /dev/mem interface.
+ */
+ if (!security_locked_down(LOCKDOWN_DEV_MEM) && capable(CAP_SYS_RAWIO))
+ tpmi_dbgfs_register(tpmi_info);
+
+ return 0;
}
static int tpmi_probe(struct auxiliary_device *auxdev,
return intel_vsec_tpmi_init(auxdev);
}
-/*
- * Remove callback is not needed currently as there is no
- * cleanup required. All memory allocs are device managed. All
- * devices created by this modules are also device managed.
- */
+static void tpmi_remove(struct auxiliary_device *auxdev)
+{
+ struct intel_tpmi_info *tpmi_info = auxiliary_get_drvdata(auxdev);
+
+ debugfs_remove_recursive(tpmi_info->dbgfs_dir);
+}
static const struct auxiliary_device_id tpmi_id_table[] = {
{ .name = "intel_vsec.tpmi" },
static struct auxiliary_driver tpmi_aux_driver = {
.id_table = tpmi_id_table,
.probe = tpmi_probe,
+ .remove = tpmi_remove,
};
module_auxiliary_driver(tpmi_aux_driver);
projects / users / hch / xfs.git / commitdiff