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linux/drivers/crypto/ccp/ccp-debugfs.c
Greg Kroah-Hartman 31e1d26087 crypto: ccp - no need to check return value of debugfs_create functions 
When calling debugfs functions, there is no need to ever check the
return value.  The function can work or not, but the code logic should
never do something different based on this.

Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Gary Hook <gary.hook@amd.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: linux-crypto@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Gary R Hook <gary.hook@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2019-02-01 14:42:03 +08:00

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/*
* AMD Cryptographic Coprocessor (CCP) driver
*
* Copyright (C) 2017 Advanced Micro Devices, Inc.
*
* Author: Gary R Hook <gary.hook@amd.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#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)
{
debugfs_remove_recursive(ccp_debugfs_dir);
}
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