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![Alexey Khoroshilov](/assets/img/avatar_default.png)
There is no check if ioremap_nocache() returns a valid pointer. Potentially it can lead to null pointer dereference. Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (renamed goto labels)
720 lines
18 KiB
C
720 lines
18 KiB
C
/*
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* nosy - Snoop mode driver for TI PCILynx 1394 controllers
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* Copyright (C) 2002-2007 Kristian Høgsberg
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/kref.h>
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#include <linux/miscdevice.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/pci.h>
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#include <linux/poll.h>
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#include <linux/sched.h> /* required for linux/wait.h */
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/time64.h>
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#include <linux/timex.h>
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#include <linux/uaccess.h>
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#include <linux/wait.h>
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#include <linux/dma-mapping.h>
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#include <linux/atomic.h>
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#include <asm/byteorder.h>
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#include "nosy.h"
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#include "nosy-user.h"
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#define TCODE_PHY_PACKET 0x10
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#define PCI_DEVICE_ID_TI_PCILYNX 0x8000
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static char driver_name[] = KBUILD_MODNAME;
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/* this is the physical layout of a PCL, its size is 128 bytes */
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struct pcl {
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__le32 next;
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__le32 async_error_next;
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u32 user_data;
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__le32 pcl_status;
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__le32 remaining_transfer_count;
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__le32 next_data_buffer;
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struct {
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__le32 control;
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__le32 pointer;
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} buffer[13];
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};
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struct packet {
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unsigned int length;
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char data[0];
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};
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struct packet_buffer {
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char *data;
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size_t capacity;
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long total_packet_count, lost_packet_count;
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atomic_t size;
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struct packet *head, *tail;
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wait_queue_head_t wait;
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};
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struct pcilynx {
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struct pci_dev *pci_device;
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__iomem char *registers;
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struct pcl *rcv_start_pcl, *rcv_pcl;
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__le32 *rcv_buffer;
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dma_addr_t rcv_start_pcl_bus, rcv_pcl_bus, rcv_buffer_bus;
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spinlock_t client_list_lock;
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struct list_head client_list;
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struct miscdevice misc;
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struct list_head link;
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struct kref kref;
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};
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static inline struct pcilynx *
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lynx_get(struct pcilynx *lynx)
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{
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kref_get(&lynx->kref);
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return lynx;
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}
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static void
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lynx_release(struct kref *kref)
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{
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kfree(container_of(kref, struct pcilynx, kref));
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}
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static inline void
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lynx_put(struct pcilynx *lynx)
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{
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kref_put(&lynx->kref, lynx_release);
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}
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struct client {
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struct pcilynx *lynx;
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u32 tcode_mask;
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struct packet_buffer buffer;
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struct list_head link;
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};
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static DEFINE_MUTEX(card_mutex);
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static LIST_HEAD(card_list);
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static int
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packet_buffer_init(struct packet_buffer *buffer, size_t capacity)
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{
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buffer->data = kmalloc(capacity, GFP_KERNEL);
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if (buffer->data == NULL)
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return -ENOMEM;
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buffer->head = (struct packet *) buffer->data;
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buffer->tail = (struct packet *) buffer->data;
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buffer->capacity = capacity;
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buffer->lost_packet_count = 0;
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atomic_set(&buffer->size, 0);
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init_waitqueue_head(&buffer->wait);
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return 0;
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}
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static void
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packet_buffer_destroy(struct packet_buffer *buffer)
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{
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kfree(buffer->data);
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}
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static int
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packet_buffer_get(struct client *client, char __user *data, size_t user_length)
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{
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struct packet_buffer *buffer = &client->buffer;
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size_t length;
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char *end;
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if (wait_event_interruptible(buffer->wait,
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atomic_read(&buffer->size) > 0) ||
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list_empty(&client->lynx->link))
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return -ERESTARTSYS;
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if (atomic_read(&buffer->size) == 0)
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return -ENODEV;
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/* FIXME: Check length <= user_length. */
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end = buffer->data + buffer->capacity;
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length = buffer->head->length;
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if (&buffer->head->data[length] < end) {
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if (copy_to_user(data, buffer->head->data, length))
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return -EFAULT;
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buffer->head = (struct packet *) &buffer->head->data[length];
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} else {
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size_t split = end - buffer->head->data;
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if (copy_to_user(data, buffer->head->data, split))
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return -EFAULT;
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if (copy_to_user(data + split, buffer->data, length - split))
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return -EFAULT;
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buffer->head = (struct packet *) &buffer->data[length - split];
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}
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/*
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* Decrease buffer->size as the last thing, since this is what
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* keeps the interrupt from overwriting the packet we are
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* retrieving from the buffer.
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*/
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atomic_sub(sizeof(struct packet) + length, &buffer->size);
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return length;
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}
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static void
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packet_buffer_put(struct packet_buffer *buffer, void *data, size_t length)
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{
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char *end;
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buffer->total_packet_count++;
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if (buffer->capacity <
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atomic_read(&buffer->size) + sizeof(struct packet) + length) {
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buffer->lost_packet_count++;
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return;
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}
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end = buffer->data + buffer->capacity;
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buffer->tail->length = length;
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if (&buffer->tail->data[length] < end) {
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memcpy(buffer->tail->data, data, length);
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buffer->tail = (struct packet *) &buffer->tail->data[length];
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} else {
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size_t split = end - buffer->tail->data;
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memcpy(buffer->tail->data, data, split);
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memcpy(buffer->data, data + split, length - split);
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buffer->tail = (struct packet *) &buffer->data[length - split];
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}
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/* Finally, adjust buffer size and wake up userspace reader. */
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atomic_add(sizeof(struct packet) + length, &buffer->size);
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wake_up_interruptible(&buffer->wait);
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}
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static inline void
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reg_write(struct pcilynx *lynx, int offset, u32 data)
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{
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writel(data, lynx->registers + offset);
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}
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static inline u32
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reg_read(struct pcilynx *lynx, int offset)
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{
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return readl(lynx->registers + offset);
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}
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static inline void
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reg_set_bits(struct pcilynx *lynx, int offset, u32 mask)
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{
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reg_write(lynx, offset, (reg_read(lynx, offset) | mask));
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}
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/*
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* Maybe the pcl programs could be set up to just append data instead
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* of using a whole packet.
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*/
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static inline void
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run_pcl(struct pcilynx *lynx, dma_addr_t pcl_bus,
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int dmachan)
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{
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reg_write(lynx, DMA0_CURRENT_PCL + dmachan * 0x20, pcl_bus);
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reg_write(lynx, DMA0_CHAN_CTRL + dmachan * 0x20,
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DMA_CHAN_CTRL_ENABLE | DMA_CHAN_CTRL_LINK);
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}
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static int
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set_phy_reg(struct pcilynx *lynx, int addr, int val)
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{
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if (addr > 15) {
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dev_err(&lynx->pci_device->dev,
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"PHY register address %d out of range\n", addr);
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return -1;
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}
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if (val > 0xff) {
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dev_err(&lynx->pci_device->dev,
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"PHY register value %d out of range\n", val);
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return -1;
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}
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reg_write(lynx, LINK_PHY, LINK_PHY_WRITE |
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LINK_PHY_ADDR(addr) | LINK_PHY_WDATA(val));
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return 0;
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}
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static int
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nosy_open(struct inode *inode, struct file *file)
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{
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int minor = iminor(inode);
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struct client *client;
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struct pcilynx *tmp, *lynx = NULL;
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mutex_lock(&card_mutex);
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list_for_each_entry(tmp, &card_list, link)
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if (tmp->misc.minor == minor) {
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lynx = lynx_get(tmp);
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break;
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}
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mutex_unlock(&card_mutex);
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if (lynx == NULL)
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return -ENODEV;
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client = kmalloc(sizeof *client, GFP_KERNEL);
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if (client == NULL)
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goto fail;
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client->tcode_mask = ~0;
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client->lynx = lynx;
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INIT_LIST_HEAD(&client->link);
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if (packet_buffer_init(&client->buffer, 128 * 1024) < 0)
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goto fail;
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file->private_data = client;
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return nonseekable_open(inode, file);
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fail:
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kfree(client);
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lynx_put(lynx);
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return -ENOMEM;
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}
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static int
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nosy_release(struct inode *inode, struct file *file)
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{
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struct client *client = file->private_data;
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struct pcilynx *lynx = client->lynx;
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spin_lock_irq(&lynx->client_list_lock);
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list_del_init(&client->link);
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spin_unlock_irq(&lynx->client_list_lock);
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packet_buffer_destroy(&client->buffer);
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kfree(client);
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lynx_put(lynx);
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return 0;
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}
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static unsigned int
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nosy_poll(struct file *file, poll_table *pt)
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{
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struct client *client = file->private_data;
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unsigned int ret = 0;
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poll_wait(file, &client->buffer.wait, pt);
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if (atomic_read(&client->buffer.size) > 0)
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ret = POLLIN | POLLRDNORM;
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if (list_empty(&client->lynx->link))
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ret |= POLLHUP;
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return ret;
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}
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static ssize_t
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nosy_read(struct file *file, char __user *buffer, size_t count, loff_t *offset)
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{
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struct client *client = file->private_data;
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return packet_buffer_get(client, buffer, count);
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}
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static long
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nosy_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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struct client *client = file->private_data;
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spinlock_t *client_list_lock = &client->lynx->client_list_lock;
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struct nosy_stats stats;
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switch (cmd) {
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case NOSY_IOC_GET_STATS:
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spin_lock_irq(client_list_lock);
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stats.total_packet_count = client->buffer.total_packet_count;
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stats.lost_packet_count = client->buffer.lost_packet_count;
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spin_unlock_irq(client_list_lock);
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if (copy_to_user((void __user *) arg, &stats, sizeof stats))
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return -EFAULT;
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else
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return 0;
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case NOSY_IOC_START:
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spin_lock_irq(client_list_lock);
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list_add_tail(&client->link, &client->lynx->client_list);
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spin_unlock_irq(client_list_lock);
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return 0;
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case NOSY_IOC_STOP:
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spin_lock_irq(client_list_lock);
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list_del_init(&client->link);
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spin_unlock_irq(client_list_lock);
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return 0;
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case NOSY_IOC_FILTER:
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spin_lock_irq(client_list_lock);
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client->tcode_mask = arg;
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spin_unlock_irq(client_list_lock);
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return 0;
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default:
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return -EINVAL;
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/* Flush buffer, configure filter. */
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}
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}
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static const struct file_operations nosy_ops = {
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.owner = THIS_MODULE,
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.read = nosy_read,
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.unlocked_ioctl = nosy_ioctl,
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.poll = nosy_poll,
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.open = nosy_open,
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.release = nosy_release,
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};
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#define PHY_PACKET_SIZE 12 /* 1 payload, 1 inverse, 1 ack = 3 quadlets */
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static void
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packet_irq_handler(struct pcilynx *lynx)
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{
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struct client *client;
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u32 tcode_mask, tcode, timestamp;
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size_t length;
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struct timespec64 ts64;
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/* FIXME: Also report rcv_speed. */
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length = __le32_to_cpu(lynx->rcv_pcl->pcl_status) & 0x00001fff;
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tcode = __le32_to_cpu(lynx->rcv_buffer[1]) >> 4 & 0xf;
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ktime_get_real_ts64(&ts64);
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timestamp = ts64.tv_nsec / NSEC_PER_USEC;
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lynx->rcv_buffer[0] = (__force __le32)timestamp;
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if (length == PHY_PACKET_SIZE)
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tcode_mask = 1 << TCODE_PHY_PACKET;
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else
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tcode_mask = 1 << tcode;
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spin_lock(&lynx->client_list_lock);
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list_for_each_entry(client, &lynx->client_list, link)
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if (client->tcode_mask & tcode_mask)
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packet_buffer_put(&client->buffer,
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lynx->rcv_buffer, length + 4);
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spin_unlock(&lynx->client_list_lock);
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}
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static void
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bus_reset_irq_handler(struct pcilynx *lynx)
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{
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struct client *client;
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struct timespec64 ts64;
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u32 timestamp;
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ktime_get_real_ts64(&ts64);
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timestamp = ts64.tv_nsec / NSEC_PER_USEC;
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spin_lock(&lynx->client_list_lock);
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list_for_each_entry(client, &lynx->client_list, link)
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packet_buffer_put(&client->buffer, ×tamp, 4);
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spin_unlock(&lynx->client_list_lock);
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}
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static irqreturn_t
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irq_handler(int irq, void *device)
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{
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struct pcilynx *lynx = device;
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u32 pci_int_status;
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pci_int_status = reg_read(lynx, PCI_INT_STATUS);
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if (pci_int_status == ~0)
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/* Card was ejected. */
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return IRQ_NONE;
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if ((pci_int_status & PCI_INT_INT_PEND) == 0)
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/* Not our interrupt, bail out quickly. */
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return IRQ_NONE;
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if ((pci_int_status & PCI_INT_P1394_INT) != 0) {
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u32 link_int_status;
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link_int_status = reg_read(lynx, LINK_INT_STATUS);
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reg_write(lynx, LINK_INT_STATUS, link_int_status);
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if ((link_int_status & LINK_INT_PHY_BUSRESET) > 0)
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bus_reset_irq_handler(lynx);
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}
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/* Clear the PCI_INT_STATUS register only after clearing the
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* LINK_INT_STATUS register; otherwise the PCI_INT_P1394 will
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* be set again immediately. */
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reg_write(lynx, PCI_INT_STATUS, pci_int_status);
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if ((pci_int_status & PCI_INT_DMA0_HLT) > 0) {
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packet_irq_handler(lynx);
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run_pcl(lynx, lynx->rcv_start_pcl_bus, 0);
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}
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return IRQ_HANDLED;
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}
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static void
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remove_card(struct pci_dev *dev)
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{
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struct pcilynx *lynx = pci_get_drvdata(dev);
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struct client *client;
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mutex_lock(&card_mutex);
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list_del_init(&lynx->link);
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misc_deregister(&lynx->misc);
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mutex_unlock(&card_mutex);
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reg_write(lynx, PCI_INT_ENABLE, 0);
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free_irq(lynx->pci_device->irq, lynx);
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spin_lock_irq(&lynx->client_list_lock);
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list_for_each_entry(client, &lynx->client_list, link)
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wake_up_interruptible(&client->buffer.wait);
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spin_unlock_irq(&lynx->client_list_lock);
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pci_free_consistent(lynx->pci_device, sizeof(struct pcl),
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lynx->rcv_start_pcl, lynx->rcv_start_pcl_bus);
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pci_free_consistent(lynx->pci_device, sizeof(struct pcl),
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lynx->rcv_pcl, lynx->rcv_pcl_bus);
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pci_free_consistent(lynx->pci_device, PAGE_SIZE,
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lynx->rcv_buffer, lynx->rcv_buffer_bus);
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iounmap(lynx->registers);
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pci_disable_device(dev);
|
|
lynx_put(lynx);
|
|
}
|
|
|
|
#define RCV_BUFFER_SIZE (16 * 1024)
|
|
|
|
static int
|
|
add_card(struct pci_dev *dev, const struct pci_device_id *unused)
|
|
{
|
|
struct pcilynx *lynx;
|
|
u32 p, end;
|
|
int ret, i;
|
|
|
|
if (pci_set_dma_mask(dev, DMA_BIT_MASK(32))) {
|
|
dev_err(&dev->dev,
|
|
"DMA address limits not supported for PCILynx hardware\n");
|
|
return -ENXIO;
|
|
}
|
|
if (pci_enable_device(dev)) {
|
|
dev_err(&dev->dev, "Failed to enable PCILynx hardware\n");
|
|
return -ENXIO;
|
|
}
|
|
pci_set_master(dev);
|
|
|
|
lynx = kzalloc(sizeof *lynx, GFP_KERNEL);
|
|
if (lynx == NULL) {
|
|
dev_err(&dev->dev, "Failed to allocate control structure\n");
|
|
ret = -ENOMEM;
|
|
goto fail_disable;
|
|
}
|
|
lynx->pci_device = dev;
|
|
pci_set_drvdata(dev, lynx);
|
|
|
|
spin_lock_init(&lynx->client_list_lock);
|
|
INIT_LIST_HEAD(&lynx->client_list);
|
|
kref_init(&lynx->kref);
|
|
|
|
lynx->registers = ioremap_nocache(pci_resource_start(dev, 0),
|
|
PCILYNX_MAX_REGISTER);
|
|
if (lynx->registers == NULL) {
|
|
dev_err(&dev->dev, "Failed to map registers\n");
|
|
ret = -ENOMEM;
|
|
goto fail_deallocate_lynx;
|
|
}
|
|
|
|
lynx->rcv_start_pcl = pci_alloc_consistent(lynx->pci_device,
|
|
sizeof(struct pcl), &lynx->rcv_start_pcl_bus);
|
|
lynx->rcv_pcl = pci_alloc_consistent(lynx->pci_device,
|
|
sizeof(struct pcl), &lynx->rcv_pcl_bus);
|
|
lynx->rcv_buffer = pci_alloc_consistent(lynx->pci_device,
|
|
RCV_BUFFER_SIZE, &lynx->rcv_buffer_bus);
|
|
if (lynx->rcv_start_pcl == NULL ||
|
|
lynx->rcv_pcl == NULL ||
|
|
lynx->rcv_buffer == NULL) {
|
|
dev_err(&dev->dev, "Failed to allocate receive buffer\n");
|
|
ret = -ENOMEM;
|
|
goto fail_deallocate_buffers;
|
|
}
|
|
lynx->rcv_start_pcl->next = cpu_to_le32(lynx->rcv_pcl_bus);
|
|
lynx->rcv_pcl->next = cpu_to_le32(PCL_NEXT_INVALID);
|
|
lynx->rcv_pcl->async_error_next = cpu_to_le32(PCL_NEXT_INVALID);
|
|
|
|
lynx->rcv_pcl->buffer[0].control =
|
|
cpu_to_le32(PCL_CMD_RCV | PCL_BIGENDIAN | 2044);
|
|
lynx->rcv_pcl->buffer[0].pointer =
|
|
cpu_to_le32(lynx->rcv_buffer_bus + 4);
|
|
p = lynx->rcv_buffer_bus + 2048;
|
|
end = lynx->rcv_buffer_bus + RCV_BUFFER_SIZE;
|
|
for (i = 1; p < end; i++, p += 2048) {
|
|
lynx->rcv_pcl->buffer[i].control =
|
|
cpu_to_le32(PCL_CMD_RCV | PCL_BIGENDIAN | 2048);
|
|
lynx->rcv_pcl->buffer[i].pointer = cpu_to_le32(p);
|
|
}
|
|
lynx->rcv_pcl->buffer[i - 1].control |= cpu_to_le32(PCL_LAST_BUFF);
|
|
|
|
reg_set_bits(lynx, MISC_CONTROL, MISC_CONTROL_SWRESET);
|
|
/* Fix buggy cards with autoboot pin not tied low: */
|
|
reg_write(lynx, DMA0_CHAN_CTRL, 0);
|
|
reg_write(lynx, DMA_GLOBAL_REGISTER, 0x00 << 24);
|
|
|
|
#if 0
|
|
/* now, looking for PHY register set */
|
|
if ((get_phy_reg(lynx, 2) & 0xe0) == 0xe0) {
|
|
lynx->phyic.reg_1394a = 1;
|
|
PRINT(KERN_INFO, lynx->id,
|
|
"found 1394a conform PHY (using extended register set)");
|
|
lynx->phyic.vendor = get_phy_vendorid(lynx);
|
|
lynx->phyic.product = get_phy_productid(lynx);
|
|
} else {
|
|
lynx->phyic.reg_1394a = 0;
|
|
PRINT(KERN_INFO, lynx->id, "found old 1394 PHY");
|
|
}
|
|
#endif
|
|
|
|
/* Setup the general receive FIFO max size. */
|
|
reg_write(lynx, FIFO_SIZES, 255);
|
|
|
|
reg_set_bits(lynx, PCI_INT_ENABLE, PCI_INT_DMA_ALL);
|
|
|
|
reg_write(lynx, LINK_INT_ENABLE,
|
|
LINK_INT_PHY_TIME_OUT | LINK_INT_PHY_REG_RCVD |
|
|
LINK_INT_PHY_BUSRESET | LINK_INT_IT_STUCK |
|
|
LINK_INT_AT_STUCK | LINK_INT_SNTRJ |
|
|
LINK_INT_TC_ERR | LINK_INT_GRF_OVER_FLOW |
|
|
LINK_INT_ITF_UNDER_FLOW | LINK_INT_ATF_UNDER_FLOW);
|
|
|
|
/* Disable the L flag in self ID packets. */
|
|
set_phy_reg(lynx, 4, 0);
|
|
|
|
/* Put this baby into snoop mode */
|
|
reg_set_bits(lynx, LINK_CONTROL, LINK_CONTROL_SNOOP_ENABLE);
|
|
|
|
run_pcl(lynx, lynx->rcv_start_pcl_bus, 0);
|
|
|
|
if (request_irq(dev->irq, irq_handler, IRQF_SHARED,
|
|
driver_name, lynx)) {
|
|
dev_err(&dev->dev,
|
|
"Failed to allocate shared interrupt %d\n", dev->irq);
|
|
ret = -EIO;
|
|
goto fail_deallocate_buffers;
|
|
}
|
|
|
|
lynx->misc.parent = &dev->dev;
|
|
lynx->misc.minor = MISC_DYNAMIC_MINOR;
|
|
lynx->misc.name = "nosy";
|
|
lynx->misc.fops = &nosy_ops;
|
|
|
|
mutex_lock(&card_mutex);
|
|
ret = misc_register(&lynx->misc);
|
|
if (ret) {
|
|
dev_err(&dev->dev, "Failed to register misc char device\n");
|
|
mutex_unlock(&card_mutex);
|
|
goto fail_free_irq;
|
|
}
|
|
list_add_tail(&lynx->link, &card_list);
|
|
mutex_unlock(&card_mutex);
|
|
|
|
dev_info(&dev->dev,
|
|
"Initialized PCILynx IEEE1394 card, irq=%d\n", dev->irq);
|
|
|
|
return 0;
|
|
|
|
fail_free_irq:
|
|
reg_write(lynx, PCI_INT_ENABLE, 0);
|
|
free_irq(lynx->pci_device->irq, lynx);
|
|
|
|
fail_deallocate_buffers:
|
|
if (lynx->rcv_start_pcl)
|
|
pci_free_consistent(lynx->pci_device, sizeof(struct pcl),
|
|
lynx->rcv_start_pcl, lynx->rcv_start_pcl_bus);
|
|
if (lynx->rcv_pcl)
|
|
pci_free_consistent(lynx->pci_device, sizeof(struct pcl),
|
|
lynx->rcv_pcl, lynx->rcv_pcl_bus);
|
|
if (lynx->rcv_buffer)
|
|
pci_free_consistent(lynx->pci_device, PAGE_SIZE,
|
|
lynx->rcv_buffer, lynx->rcv_buffer_bus);
|
|
iounmap(lynx->registers);
|
|
|
|
fail_deallocate_lynx:
|
|
kfree(lynx);
|
|
|
|
fail_disable:
|
|
pci_disable_device(dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct pci_device_id pci_table[] = {
|
|
{
|
|
.vendor = PCI_VENDOR_ID_TI,
|
|
.device = PCI_DEVICE_ID_TI_PCILYNX,
|
|
.subvendor = PCI_ANY_ID,
|
|
.subdevice = PCI_ANY_ID,
|
|
},
|
|
{ } /* Terminating entry */
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(pci, pci_table);
|
|
|
|
static struct pci_driver lynx_pci_driver = {
|
|
.name = driver_name,
|
|
.id_table = pci_table,
|
|
.probe = add_card,
|
|
.remove = remove_card,
|
|
};
|
|
|
|
module_pci_driver(lynx_pci_driver);
|
|
|
|
MODULE_AUTHOR("Kristian Hoegsberg");
|
|
MODULE_DESCRIPTION("Snoop mode driver for TI pcilynx 1394 controllers");
|
|
MODULE_LICENSE("GPL");
|