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linux-next/drivers/crypto/ccp/ccp-debugfs.c
Sebastian Andrzej Siewior 79eb382b5e crypto: ccp - don't disable interrupts while setting up debugfs 
I don't why we need take a single write lock and disable interrupts
while setting up debugfs. This is what what happens when we try anyway:

|ccp 0000:03:00.2: enabling device (0000 -> 0002)
|BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:69
|in_atomic(): 1, irqs_disabled(): 1, pid: 3, name: kworker/0:0
|irq event stamp: 17150
|hardirqs last  enabled at (17149): [<0000000097a18c49>] restore_regs_and_return_to_kernel+0x0/0x23
|hardirqs last disabled at (17150): [<000000000773b3a9>] _raw_write_lock_irqsave+0x1b/0x50
|softirqs last  enabled at (17148): [<0000000064d56155>] __do_softirq+0x3b8/0x4c1
|softirqs last disabled at (17125): [<0000000092633c18>] irq_exit+0xb1/0xc0
|CPU: 0 PID: 3 Comm: kworker/0:0 Not tainted 4.16.0-rc2+ #30
|Workqueue: events work_for_cpu_fn
|Call Trace:
| dump_stack+0x7d/0xb6
| ___might_sleep+0x1eb/0x250
| down_write+0x17/0x60
| start_creating+0x4c/0xe0
| debugfs_create_dir+0x9/0x100
| ccp5_debugfs_setup+0x191/0x1b0
| ccp5_init+0x8a7/0x8c0
| ccp_dev_init+0xb8/0xe0
| sp_init+0x6c/0x90
| sp_pci_probe+0x26e/0x590
| local_pci_probe+0x3f/0x90
| work_for_cpu_fn+0x11/0x20
| process_one_work+0x1ff/0x650
| worker_thread+0x1d4/0x3a0
| kthread+0xfe/0x130
| ret_from_fork+0x27/0x50

If any locking is required, a simple mutex will do it.

Cc: Gary R Hook <gary.hook@amd.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Gary R Hook <gary.hook@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2018-03-03 00:03:40 +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_info;
struct dentry *debugfs_stats;
struct dentry *debugfs_q_instance;
struct dentry *debugfs_q_stats;
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);
if (!ccp_debugfs_dir)
return;
ccp->debugfs_instance = debugfs_create_dir(ccp->name, ccp_debugfs_dir);
if (!ccp->debugfs_instance)
goto err;
debugfs_info = debugfs_create_file("info", 0400,
ccp->debugfs_instance, ccp,
&ccp_debugfs_info_ops);
if (!debugfs_info)
goto err;
debugfs_stats = debugfs_create_file("stats", 0600,
ccp->debugfs_instance, ccp,
&ccp_debugfs_stats_ops);
if (!debugfs_stats)
goto err;
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);
if (!debugfs_q_instance)
goto err;
debugfs_q_stats =
debugfs_create_file("stats", 0600,
debugfs_q_instance, cmd_q,
&ccp_debugfs_queue_ops);
if (!debugfs_q_stats)
goto err;
}
return;
err:
debugfs_remove_recursive(ccp->debugfs_instance);
}
void ccp5_debugfs_destroy(void)
{
debugfs_remove_recursive(ccp_debugfs_dir);
}
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