Quelle  ccp-debugfs.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
 * AMD Cryptographic Coprocessor (CCP) driver
 *
 * Copyright (C) 2017 Advanced Micro Devices, Inc.
 *
 * Author: Gary R Hook <gary.hook@amd.com>
 */

#include <linux/debugfs.h>
#include <linux/ccp.h>

#include "ccp-dev.h"

/* DebugFS helpers */
#define OBUFP  (obuf + oboff)
#define OBUFLEN  512
#define OBUFSPC  (OBUFLEN - oboff)
#define OSCNPRINTF(fmt, ...) \
  scnprintf(OBUFP, OBUFSPC, fmt, ## __VA_ARGS__)

#define BUFLEN 63

#define RI_VERSION_NUM 0x0000003F
#define RI_AES_PRESENT 0x00000040
#define RI_3DES_PRESENT 0x00000080
#define RI_SHA_PRESENT 0x00000100
#define RI_RSA_PRESENT 0x00000200
#define RI_ECC_PRESENT 0x00000400
#define RI_ZDE_PRESENT 0x00000800
#define RI_ZCE_PRESENT 0x00001000
#define RI_TRNG_PRESENT 0x00002000
#define RI_ELFC_PRESENT 0x00004000
#define RI_ELFC_SHIFT 14
#define RI_NUM_VQM 0x00078000
#define RI_NVQM_SHIFT 15
#define RI_NVQM(r) (((r) * RI_NUM_VQM) >> RI_NVQM_SHIFT)
#define RI_LSB_ENTRIES 0x0FF80000
#define RI_NLSB_SHIFT 19
#define RI_NLSB(r) (((r) * RI_LSB_ENTRIES) >> RI_NLSB_SHIFT)

static ssize_t ccp5_debugfs_info_read(struct file *filp, char __user *ubuf,
          size_t count, loff_t *offp)
{
 struct ccp_device *ccp = filp->private_data;
 unsigned int oboff = 0;
 unsigned int regval;
 ssize_t ret;
 char *obuf;

 if (!ccp)
  return 0;

 obuf = kmalloc(OBUFLEN, GFP_KERNEL);
 if (!obuf)
  return -ENOMEM;

 oboff += OSCNPRINTF("Device name: %s\n", ccp->name);
 oboff += OSCNPRINTF(" RNG name: %s\n", ccp->rngname);
 oboff += OSCNPRINTF(" # Queues: %d\n", ccp->cmd_q_count);
 oboff += OSCNPRINTF(" # Cmds: %d\n", ccp->cmd_count);

 regval = ioread32(ccp->io_regs + CMD5_PSP_CCP_VERSION);
 oboff += OSCNPRINTF(" Version: %d\n", regval & RI_VERSION_NUM);
 oboff += OSCNPRINTF(" Engines:");
 if (regval & RI_AES_PRESENT)
  oboff += OSCNPRINTF(" AES");
 if (regval & RI_3DES_PRESENT)
  oboff += OSCNPRINTF(" 3DES");
 if (regval & RI_SHA_PRESENT)
  oboff += OSCNPRINTF(" SHA");
 if (regval & RI_RSA_PRESENT)
  oboff += OSCNPRINTF(" RSA");
 if (regval & RI_ECC_PRESENT)
  oboff += OSCNPRINTF(" ECC");
 if (regval & RI_ZDE_PRESENT)
  oboff += OSCNPRINTF(" ZDE");
 if (regval & RI_ZCE_PRESENT)
  oboff += OSCNPRINTF(" ZCE");
 if (regval & RI_TRNG_PRESENT)
  oboff += OSCNPRINTF(" TRNG");
 oboff += OSCNPRINTF("\n");
 oboff += OSCNPRINTF(" Queues: %d\n",
     (regval & RI_NUM_VQM) >> RI_NVQM_SHIFT);
 oboff += OSCNPRINTF("LSB Entries: %d\n",
     (regval & RI_LSB_ENTRIES) >> RI_NLSB_SHIFT);

 ret = simple_read_from_buffer(ubuf, count, offp, obuf, oboff);
 kfree(obuf);

 return ret;
}

/* Return a formatted buffer containing the current
 * statistics across all queues for a CCP.
 */
static ssize_t ccp5_debugfs_stats_read(struct file *filp, char __user *ubuf,
           size_t count, loff_t *offp)
{
 struct ccp_device *ccp = filp->private_data;
 unsigned long total_xts_aes_ops = 0;
 unsigned long total_3des_ops = 0;
 unsigned long total_aes_ops = 0;
 unsigned long total_sha_ops = 0;
 unsigned long total_rsa_ops = 0;
 unsigned long total_ecc_ops = 0;
 unsigned long total_pt_ops = 0;
 unsigned long total_ops = 0;
 unsigned int oboff = 0;
 ssize_t ret = 0;
 unsigned int i;
 char *obuf;

 for (i = 0; i < ccp->cmd_q_count; i++) {
  struct ccp_cmd_queue *cmd_q = &ccp->cmd_q[i];

  total_ops += cmd_q->total_ops;
  total_aes_ops += cmd_q->total_aes_ops;
  total_xts_aes_ops += cmd_q->total_xts_aes_ops;
  total_3des_ops += cmd_q->total_3des_ops;
  total_sha_ops += cmd_q->total_sha_ops;
  total_rsa_ops += cmd_q->total_rsa_ops;
  total_pt_ops += cmd_q->total_pt_ops;
  total_ecc_ops += cmd_q->total_ecc_ops;
 }

 obuf = kmalloc(OBUFLEN, GFP_KERNEL);
 if (!obuf)
  return -ENOMEM;

 oboff += OSCNPRINTF("Total Interrupts Handled: %ld\n",
       ccp->total_interrupts);
 oboff += OSCNPRINTF(" Total Operations: %ld\n",
       total_ops);
 oboff += OSCNPRINTF(" AES: %ld\n",
       total_aes_ops);
 oboff += OSCNPRINTF(" XTS AES: %ld\n",
       total_xts_aes_ops);
 oboff += OSCNPRINTF(" SHA: %ld\n",
       total_3des_ops);
 oboff += OSCNPRINTF(" SHA: %ld\n",
       total_sha_ops);
 oboff += OSCNPRINTF(" RSA: %ld\n",
       total_rsa_ops);
 oboff += OSCNPRINTF(" Pass-Thru: %ld\n",
       total_pt_ops);
 oboff += OSCNPRINTF(" ECC: %ld\n",
       total_ecc_ops);

 ret = simple_read_from_buffer(ubuf, count, offp, obuf, oboff);
 kfree(obuf);

 return ret;
}

/* Reset the counters in a queue
 */
static void ccp5_debugfs_reset_queue_stats(struct ccp_cmd_queue *cmd_q)
{
 cmd_q->total_ops = 0L;
 cmd_q->total_aes_ops = 0L;
 cmd_q->total_xts_aes_ops = 0L;
 cmd_q->total_3des_ops = 0L;
 cmd_q->total_sha_ops = 0L;
 cmd_q->total_rsa_ops = 0L;
 cmd_q->total_pt_ops = 0L;
 cmd_q->total_ecc_ops = 0L;
}

/* A value was written to the stats variable, which
 * should be used to reset the queue counters across
 * that device.
 */
static ssize_t ccp5_debugfs_stats_write(struct file *filp,
     const char __user *ubuf,
     size_t count, loff_t *offp)
{
 struct ccp_device *ccp = filp->private_data;
 int i;

 for (i = 0; i < ccp->cmd_q_count; i++)
  ccp5_debugfs_reset_queue_stats(&ccp->cmd_q[i]);
 ccp->total_interrupts = 0L;

 return count;
}

/* Return a formatted buffer containing the current information
 * for that queue
 */
static ssize_t ccp5_debugfs_queue_read(struct file *filp, char __user *ubuf,
           size_t count, loff_t *offp)
{
 struct ccp_cmd_queue *cmd_q = filp->private_data;
 unsigned int oboff = 0;
 unsigned int regval;
 ssize_t ret;
 char *obuf;

 if (!cmd_q)
  return 0;

 obuf = kmalloc(OBUFLEN, GFP_KERNEL);
 if (!obuf)
  return -ENOMEM;

 oboff += OSCNPRINTF(" Total Queue Operations: %ld\n",
       cmd_q->total_ops);
 oboff += OSCNPRINTF(" AES: %ld\n",
       cmd_q->total_aes_ops);
 oboff += OSCNPRINTF(" XTS AES: %ld\n",
       cmd_q->total_xts_aes_ops);
 oboff += OSCNPRINTF(" SHA: %ld\n",
       cmd_q->total_3des_ops);
 oboff += OSCNPRINTF(" SHA: %ld\n",
       cmd_q->total_sha_ops);
 oboff += OSCNPRINTF(" RSA: %ld\n",
       cmd_q->total_rsa_ops);
 oboff += OSCNPRINTF(" Pass-Thru: %ld\n",
       cmd_q->total_pt_ops);
 oboff += OSCNPRINTF(" ECC: %ld\n",
       cmd_q->total_ecc_ops);

 regval = ioread32(cmd_q->reg_int_enable);
 oboff += OSCNPRINTF(" Enabled Interrupts:");
 if (regval & INT_EMPTY_QUEUE)
  oboff += OSCNPRINTF(" EMPTY");
 if (regval & INT_QUEUE_STOPPED)
  oboff += OSCNPRINTF(" STOPPED");
 if (regval & INT_ERROR)
  oboff += OSCNPRINTF(" ERROR");
 if (regval & INT_COMPLETION)
  oboff += OSCNPRINTF(" COMPLETION");
 oboff += OSCNPRINTF("\n");

 ret = simple_read_from_buffer(ubuf, count, offp, obuf, oboff);
 kfree(obuf);

 return ret;
}

/* A value was written to the stats variable for a
 * queue. Reset the queue counters to this value.
 */
static ssize_t ccp5_debugfs_queue_write(struct file *filp,
     const char __user *ubuf,
     size_t count, loff_t *offp)
{
 struct ccp_cmd_queue *cmd_q = filp->private_data;

 ccp5_debugfs_reset_queue_stats(cmd_q);

 return count;
}

static const struct file_operations ccp_debugfs_info_ops = {
 .owner = THIS_MODULE,
 .open = simple_open,
 .read = ccp5_debugfs_info_read,
 .write = NULL,
};

static const struct file_operations ccp_debugfs_queue_ops = {
 .owner = THIS_MODULE,
 .open = simple_open,
 .read = ccp5_debugfs_queue_read,
 .write = ccp5_debugfs_queue_write,
};

static const struct file_operations ccp_debugfs_stats_ops = {
 .owner = THIS_MODULE,
 .open = simple_open,
 .read = ccp5_debugfs_stats_read,
 .write = ccp5_debugfs_stats_write,
};

static struct dentry *ccp_debugfs_dir;
static DEFINE_MUTEX(ccp_debugfs_lock);

#define MAX_NAME_LEN 20

void ccp5_debugfs_setup(struct ccp_device *ccp)
{
 struct ccp_cmd_queue *cmd_q;
 char name[MAX_NAME_LEN + 1];
 struct dentry *debugfs_q_instance;
 int i;

 if (!debugfs_initialized())
  return;

 mutex_lock(&ccp_debugfs_lock);
 if (!ccp_debugfs_dir)
  ccp_debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL);
 mutex_unlock(&ccp_debugfs_lock);

 ccp->debugfs_instance = debugfs_create_dir(ccp->name, ccp_debugfs_dir);

 debugfs_create_file("info", 0400, ccp->debugfs_instance, ccp,
       &ccp_debugfs_info_ops);

 debugfs_create_file("stats", 0600, ccp->debugfs_instance, ccp,
       &ccp_debugfs_stats_ops);

 for (i = 0; i < ccp->cmd_q_count; i++) {
  cmd_q = &ccp->cmd_q[i];

  snprintf(name, MAX_NAME_LEN - 1, "q%d", cmd_q->id);

  debugfs_q_instance =
   debugfs_create_dir(name, ccp->debugfs_instance);

  debugfs_create_file("stats", 0600, debugfs_q_instance, cmd_q,
        &ccp_debugfs_queue_ops);
 }

 return;
}

void ccp5_debugfs_destroy(void)
{
 mutex_lock(&ccp_debugfs_lock);
 debugfs_remove_recursive(ccp_debugfs_dir);
 ccp_debugfs_dir = NULL;
 mutex_unlock(&ccp_debugfs_lock);
}