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linux_dsm_epyc7002/drivers/vme/vme.c
Jia-Ju Bai 97784615ed vme: Fix a possible sleep-in-atomic bug in vme_tsi148 
The driver may sleep under a spinlock.
The function call path is:
tsi148_master_write \ tsi148_master_read (acquire the spinlock)
  vme_register_error_handler
    kmalloc(GFP_KERNEL) --> may sleep

To fix it, GFP_KERNEL is replaced with GFP_ATOMIC.

This bug is found by my static analysis tool(DSAC) and checked by my code review.

Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-12-18 15:59:18 +01:00

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/*
* VME Bridge Framework
*
* Author: Martyn Welch <martyn.welch@ge.com>
* Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc.
*
* Based on work by Tom Armistead and Ajit Prem
* Copyright 2004 Motorola Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/init.h>
#include <linux/export.h>
#include <linux/mm.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/pci.h>
#include <linux/poll.h>
#include <linux/highmem.h>
#include <linux/interrupt.h>
#include <linux/pagemap.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/syscalls.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/vme.h>
#include "vme_bridge.h"
/* Bitmask and list of registered buses both protected by common mutex */
static unsigned int vme_bus_numbers;
static LIST_HEAD(vme_bus_list);
static DEFINE_MUTEX(vme_buses_lock);
static int __init vme_init(void);
static struct vme_dev *dev_to_vme_dev(struct device *dev)
{
return container_of(dev, struct vme_dev, dev);
}
/*
* Find the bridge that the resource is associated with.
*/
static struct vme_bridge *find_bridge(struct vme_resource *resource)
{
/* Get list to search */
switch (resource->type) {
case VME_MASTER:
return list_entry(resource->entry, struct vme_master_resource,
list)->parent;
break;
case VME_SLAVE:
return list_entry(resource->entry, struct vme_slave_resource,
list)->parent;
break;
case VME_DMA:
return list_entry(resource->entry, struct vme_dma_resource,
list)->parent;
break;
case VME_LM:
return list_entry(resource->entry, struct vme_lm_resource,
list)->parent;
break;
default:
printk(KERN_ERR "Unknown resource type\n");
return NULL;
break;
}
}
/**
* vme_free_consistent - Allocate contiguous memory.
* @resource: Pointer to VME resource.
* @size: Size of allocation required.
* @dma: Pointer to variable to store physical address of allocation.
*
* Allocate a contiguous block of memory for use by the driver. This is used to
* create the buffers for the slave windows.
*
* Return: Virtual address of allocation on success, NULL on failure.
*/
void *vme_alloc_consistent(struct vme_resource *resource, size_t size,
dma_addr_t *dma)
{
struct vme_bridge *bridge;
if (!resource) {
printk(KERN_ERR "No resource\n");
return NULL;
}
bridge = find_bridge(resource);
if (!bridge) {
printk(KERN_ERR "Can't find bridge\n");
return NULL;
}
if (!bridge->parent) {
printk(KERN_ERR "Dev entry NULL for bridge %s\n", bridge->name);
return NULL;
}
if (!bridge->alloc_consistent) {
printk(KERN_ERR "alloc_consistent not supported by bridge %s\n",
bridge->name);
return NULL;
}
return bridge->alloc_consistent(bridge->parent, size, dma);
}
EXPORT_SYMBOL(vme_alloc_consistent);
/**
* vme_free_consistent - Free previously allocated memory.
* @resource: Pointer to VME resource.
* @size: Size of allocation to free.
* @vaddr: Virtual address of allocation.
* @dma: Physical address of allocation.
*
* Free previously allocated block of contiguous memory.
*/
void vme_free_consistent(struct vme_resource *resource, size_t size,
void *vaddr, dma_addr_t dma)
{
struct vme_bridge *bridge;
if (!resource) {
printk(KERN_ERR "No resource\n");
return;
}
bridge = find_bridge(resource);
if (!bridge) {
printk(KERN_ERR "Can't find bridge\n");
return;
}
if (!bridge->parent) {
printk(KERN_ERR "Dev entry NULL for bridge %s\n", bridge->name);
return;
}
if (!bridge->free_consistent) {
printk(KERN_ERR "free_consistent not supported by bridge %s\n",
bridge->name);
return;
}
bridge->free_consistent(bridge->parent, size, vaddr, dma);
}
EXPORT_SYMBOL(vme_free_consistent);
/**
* vme_get_size - Helper function returning size of a VME window
* @resource: Pointer to VME slave or master resource.
*
* Determine the size of the VME window provided. This is a helper
* function, wrappering the call to vme_master_get or vme_slave_get
* depending on the type of window resource handed to it.
*
* Return: Size of the window on success, zero on failure.
*/
size_t vme_get_size(struct vme_resource *resource)
{
int enabled, retval;
unsigned long long base, size;
dma_addr_t buf_base;
u32 aspace, cycle, dwidth;
switch (resource->type) {
case VME_MASTER:
retval = vme_master_get(resource, &enabled, &base, &size,
&aspace, &cycle, &dwidth);
if (retval)
return 0;
return size;
break;
case VME_SLAVE:
retval = vme_slave_get(resource, &enabled, &base, &size,
&buf_base, &aspace, &cycle);
if (retval)
return 0;
return size;
break;
case VME_DMA:
return 0;
break;
default:
printk(KERN_ERR "Unknown resource type\n");
return 0;
break;
}
}
EXPORT_SYMBOL(vme_get_size);
int vme_check_window(u32 aspace, unsigned long long vme_base,
unsigned long long size)
{
int retval = 0;
if (vme_base + size < size)
return -EINVAL;
switch (aspace) {
case VME_A16:
if (vme_base + size > VME_A16_MAX)
retval = -EFAULT;
break;
case VME_A24:
if (vme_base + size > VME_A24_MAX)
retval = -EFAULT;
break;
case VME_A32:
if (vme_base + size > VME_A32_MAX)
retval = -EFAULT;
break;
case VME_A64:
/* The VME_A64_MAX limit is actually U64_MAX + 1 */
break;
case VME_CRCSR:
if (vme_base + size > VME_CRCSR_MAX)
retval = -EFAULT;
break;
case VME_USER1:
case VME_USER2:
case VME_USER3:
case VME_USER4:
/* User Defined */
break;
default:
printk(KERN_ERR "Invalid address space\n");
retval = -EINVAL;
break;
}
return retval;
}
EXPORT_SYMBOL(vme_check_window);
static u32 vme_get_aspace(int am)
{
switch (am) {
case 0x29:
case 0x2D:
return VME_A16;
case 0x38:
case 0x39:
case 0x3A:
case 0x3B:
case 0x3C:
case 0x3D:
case 0x3E:
case 0x3F:
return VME_A24;
case 0x8:
case 0x9:
case 0xA:
case 0xB:
case 0xC:
case 0xD:
case 0xE:
case 0xF:
return VME_A32;
case 0x0:
case 0x1:
case 0x3:
return VME_A64;
}
return 0;
}
/**
* vme_slave_request - Request a VME slave window resource.
* @vdev: Pointer to VME device struct vme_dev assigned to driver instance.
* @address: Required VME address space.
* @cycle: Required VME data transfer cycle type.
*
* Request use of a VME window resource capable of being set for the requested
* address space and data transfer cycle.
*
* Return: Pointer to VME resource on success, NULL on failure.
*/
struct vme_resource *vme_slave_request(struct vme_dev *vdev, u32 address,
u32 cycle)
{
struct vme_bridge *bridge;
struct list_head *slave_pos = NULL;
struct vme_slave_resource *allocated_image = NULL;
struct vme_slave_resource *slave_image = NULL;
struct vme_resource *resource = NULL;
bridge = vdev->bridge;
if (!bridge) {
printk(KERN_ERR "Can't find VME bus\n");
goto err_bus;
}
/* Loop through slave resources */
list_for_each(slave_pos, &bridge->slave_resources) {
slave_image = list_entry(slave_pos,
struct vme_slave_resource, list);
if (!slave_image) {
printk(KERN_ERR "Registered NULL Slave resource\n");
continue;
}
/* Find an unlocked and compatible image */
mutex_lock(&slave_image->mtx);
if (((slave_image->address_attr & address) == address) &&
((slave_image->cycle_attr & cycle) == cycle) &&
(slave_image->locked == 0)) {
slave_image->locked = 1;
mutex_unlock(&slave_image->mtx);
allocated_image = slave_image;
break;
}
mutex_unlock(&slave_image->mtx);
}
/* No free image */
if (!allocated_image)
goto err_image;
resource = kmalloc(sizeof(*resource), GFP_KERNEL);
if (!resource)
goto err_alloc;
resource->type = VME_SLAVE;
resource->entry = &allocated_image->list;
return resource;
err_alloc:
/* Unlock image */
mutex_lock(&slave_image->mtx);
slave_image->locked = 0;
mutex_unlock(&slave_image->mtx);
err_image:
err_bus:
return NULL;
}
EXPORT_SYMBOL(vme_slave_request);
/**
* vme_slave_set - Set VME slave window configuration.
* @resource: Pointer to VME slave resource.
* @enabled: State to which the window should be configured.
* @vme_base: Base address for the window.
* @size: Size of the VME window.
* @buf_base: Based address of buffer used to provide VME slave window storage.
* @aspace: VME address space for the VME window.
* @cycle: VME data transfer cycle type for the VME window.
*
* Set configuration for provided VME slave window.
*
* Return: Zero on success, -EINVAL if operation is not supported on this
* device, if an invalid resource has been provided or invalid
* attributes are provided. Hardware specific errors may also be
* returned.
*/
int vme_slave_set(struct vme_resource *resource, int enabled,
unsigned long long vme_base, unsigned long long size,
dma_addr_t buf_base, u32 aspace, u32 cycle)
{
struct vme_bridge *bridge = find_bridge(resource);
struct vme_slave_resource *image;
int retval;
if (resource->type != VME_SLAVE) {
printk(KERN_ERR "Not a slave resource\n");
return -EINVAL;
}
image = list_entry(resource->entry, struct vme_slave_resource, list);
if (!bridge->slave_set) {
printk(KERN_ERR "Function not supported\n");
return -ENOSYS;
}
if (!(((image->address_attr & aspace) == aspace) &&
((image->cycle_attr & cycle) == cycle))) {
printk(KERN_ERR "Invalid attributes\n");
return -EINVAL;
}
retval = vme_check_window(aspace, vme_base, size);
if (retval)
return retval;
return bridge->slave_set(image, enabled, vme_base, size, buf_base,
aspace, cycle);
}
EXPORT_SYMBOL(vme_slave_set);
/**
* vme_slave_get - Retrieve VME slave window configuration.
* @resource: Pointer to VME slave resource.
* @enabled: Pointer to variable for storing state.
* @vme_base: Pointer to variable for storing window base address.
* @size: Pointer to variable for storing window size.
* @buf_base: Pointer to variable for storing slave buffer base address.
* @aspace: Pointer to variable for storing VME address space.
* @cycle: Pointer to variable for storing VME data transfer cycle type.
*
* Return configuration for provided VME slave window.
*
* Return: Zero on success, -EINVAL if operation is not supported on this
* device or if an invalid resource has been provided.
*/
int vme_slave_get(struct vme_resource *resource, int *enabled,
unsigned long long *vme_base, unsigned long long *size,
dma_addr_t *buf_base, u32 *aspace, u32 *cycle)
{
struct vme_bridge *bridge = find_bridge(resource);
struct vme_slave_resource *image;
if (resource->type != VME_SLAVE) {
printk(KERN_ERR "Not a slave resource\n");
return -EINVAL;
}
image = list_entry(resource->entry, struct vme_slave_resource, list);
if (!bridge->slave_get) {
printk(KERN_ERR "vme_slave_get not supported\n");
return -EINVAL;
}
return bridge->slave_get(image, enabled, vme_base, size, buf_base,
aspace, cycle);
}
EXPORT_SYMBOL(vme_slave_get);
/**
* vme_slave_free - Free VME slave window
* @resource: Pointer to VME slave resource.
*
* Free the provided slave resource so that it may be reallocated.
*/
void vme_slave_free(struct vme_resource *resource)
{
struct vme_slave_resource *slave_image;
if (resource->type != VME_SLAVE) {
printk(KERN_ERR "Not a slave resource\n");
return;
}
slave_image = list_entry(resource->entry, struct vme_slave_resource,
list);
if (!slave_image) {
printk(KERN_ERR "Can't find slave resource\n");
return;
}
/* Unlock image */
mutex_lock(&slave_image->mtx);
if (slave_image->locked == 0)
printk(KERN_ERR "Image is already free\n");
slave_image->locked = 0;
mutex_unlock(&slave_image->mtx);
/* Free up resource memory */
kfree(resource);
}
EXPORT_SYMBOL(vme_slave_free);
/**
* vme_master_request - Request a VME master window resource.
* @vdev: Pointer to VME device struct vme_dev assigned to driver instance.
* @address: Required VME address space.
* @cycle: Required VME data transfer cycle type.
* @dwidth: Required VME data transfer width.
*
* Request use of a VME window resource capable of being set for the requested
* address space, data transfer cycle and width.
*
* Return: Pointer to VME resource on success, NULL on failure.
*/
struct vme_resource *vme_master_request(struct vme_dev *vdev, u32 address,
u32 cycle, u32 dwidth)
{
struct vme_bridge *bridge;
struct list_head *master_pos = NULL;
struct vme_master_resource *allocated_image = NULL;
struct vme_master_resource *master_image = NULL;
struct vme_resource *resource = NULL;
bridge = vdev->bridge;
if (!bridge) {
printk(KERN_ERR "Can't find VME bus\n");
goto err_bus;
}
/* Loop through master resources */
list_for_each(master_pos, &bridge->master_resources) {
master_image = list_entry(master_pos,
struct vme_master_resource, list);
if (!master_image) {
printk(KERN_WARNING "Registered NULL master resource\n");
continue;
}
/* Find an unlocked and compatible image */
spin_lock(&master_image->lock);
if (((master_image->address_attr & address) == address) &&
((master_image->cycle_attr & cycle) == cycle) &&
((master_image->width_attr & dwidth) == dwidth) &&
(master_image->locked == 0)) {
master_image->locked = 1;
spin_unlock(&master_image->lock);
allocated_image = master_image;
break;
}
spin_unlock(&master_image->lock);
}
/* Check to see if we found a resource */
if (!allocated_image) {
printk(KERN_ERR "Can't find a suitable resource\n");
goto err_image;
}
resource = kmalloc(sizeof(*resource), GFP_KERNEL);
if (!resource)
goto err_alloc;
resource->type = VME_MASTER;
resource->entry = &allocated_image->list;
return resource;
err_alloc:
/* Unlock image */
spin_lock(&master_image->lock);
master_image->locked = 0;
spin_unlock(&master_image->lock);
err_image:
err_bus:
return NULL;
}
EXPORT_SYMBOL(vme_master_request);
/**
* vme_master_set - Set VME master window configuration.
* @resource: Pointer to VME master resource.
* @enabled: State to which the window should be configured.
* @vme_base: Base address for the window.
* @size: Size of the VME window.
* @aspace: VME address space for the VME window.
* @cycle: VME data transfer cycle type for the VME window.
* @dwidth: VME data transfer width for the VME window.
*
* Set configuration for provided VME master window.
*
* Return: Zero on success, -EINVAL if operation is not supported on this
* device, if an invalid resource has been provided or invalid
* attributes are provided. Hardware specific errors may also be
* returned.
*/
int vme_master_set(struct vme_resource *resource, int enabled,
unsigned long long vme_base, unsigned long long size, u32 aspace,
u32 cycle, u32 dwidth)
{
struct vme_bridge *bridge = find_bridge(resource);
struct vme_master_resource *image;
int retval;
if (resource->type != VME_MASTER) {
printk(KERN_ERR "Not a master resource\n");
return -EINVAL;
}
image = list_entry(resource->entry, struct vme_master_resource, list);
if (!bridge->master_set) {
printk(KERN_WARNING "vme_master_set not supported\n");
return -EINVAL;
}
if (!(((image->address_attr & aspace) == aspace) &&
((image->cycle_attr & cycle) == cycle) &&
((image->width_attr & dwidth) == dwidth))) {
printk(KERN_WARNING "Invalid attributes\n");
return -EINVAL;
}
retval = vme_check_window(aspace, vme_base, size);
if (retval)
return retval;
return bridge->master_set(image, enabled, vme_base, size, aspace,
cycle, dwidth);
}
EXPORT_SYMBOL(vme_master_set);
/**
* vme_master_get - Retrieve VME master window configuration.
* @resource: Pointer to VME master resource.
* @enabled: Pointer to variable for storing state.
* @vme_base: Pointer to variable for storing window base address.
* @size: Pointer to variable for storing window size.
* @aspace: Pointer to variable for storing VME address space.
* @cycle: Pointer to variable for storing VME data transfer cycle type.
* @dwidth: Pointer to variable for storing VME data transfer width.
*
* Return configuration for provided VME master window.
*
* Return: Zero on success, -EINVAL if operation is not supported on this
* device or if an invalid resource has been provided.
*/
int vme_master_get(struct vme_resource *resource, int *enabled,
unsigned long long *vme_base, unsigned long long *size, u32 *aspace,
u32 *cycle, u32 *dwidth)
{
struct vme_bridge *bridge = find_bridge(resource);
struct vme_master_resource *image;
if (resource->type != VME_MASTER) {
printk(KERN_ERR "Not a master resource\n");
return -EINVAL;
}
image = list_entry(resource->entry, struct vme_master_resource, list);
if (!bridge->master_get) {
printk(KERN_WARNING "%s not supported\n", __func__);
return -EINVAL;
}
return bridge->master_get(image, enabled, vme_base, size, aspace,
cycle, dwidth);
}
EXPORT_SYMBOL(vme_master_get);
/**
* vme_master_write - Read data from VME space into a buffer.
* @resource: Pointer to VME master resource.
* @buf: Pointer to buffer where data should be transferred.
* @count: Number of bytes to transfer.
* @offset: Offset into VME master window at which to start transfer.
*
* Perform read of count bytes of data from location on VME bus which maps into
* the VME master window at offset to buf.
*
* Return: Number of bytes read, -EINVAL if resource is not a VME master
* resource or read operation is not supported. -EFAULT returned if
* invalid offset is provided. Hardware specific errors may also be
* returned.
*/
ssize_t vme_master_read(struct vme_resource *resource, void *buf, size_t count,
loff_t offset)
{
struct vme_bridge *bridge = find_bridge(resource);
struct vme_master_resource *image;
size_t length;
if (!bridge->master_read) {
printk(KERN_WARNING "Reading from resource not supported\n");
return -EINVAL;
}
if (resource->type != VME_MASTER) {
printk(KERN_ERR "Not a master resource\n");
return -EINVAL;
}
image = list_entry(resource->entry, struct vme_master_resource, list);
length = vme_get_size(resource);
if (offset > length) {
printk(KERN_WARNING "Invalid Offset\n");
return -EFAULT;
}
if ((offset + count) > length)
count = length - offset;
return bridge->master_read(image, buf, count, offset);
}
EXPORT_SYMBOL(vme_master_read);
/**
* vme_master_write - Write data out to VME space from a buffer.
* @resource: Pointer to VME master resource.
* @buf: Pointer to buffer holding data to transfer.
* @count: Number of bytes to transfer.
* @offset: Offset into VME master window at which to start transfer.
*
* Perform write of count bytes of data from buf to location on VME bus which
* maps into the VME master window at offset.
*
* Return: Number of bytes written, -EINVAL if resource is not a VME master
* resource or write operation is not supported. -EFAULT returned if
* invalid offset is provided. Hardware specific errors may also be
* returned.
*/
ssize_t vme_master_write(struct vme_resource *resource, void *buf,
size_t count, loff_t offset)
{
struct vme_bridge *bridge = find_bridge(resource);
struct vme_master_resource *image;
size_t length;
if (!bridge->master_write) {
printk(KERN_WARNING "Writing to resource not supported\n");
return -EINVAL;
}
if (resource->type != VME_MASTER) {
printk(KERN_ERR "Not a master resource\n");
return -EINVAL;
}
image = list_entry(resource->entry, struct vme_master_resource, list);
length = vme_get_size(resource);
if (offset > length) {
printk(KERN_WARNING "Invalid Offset\n");
return -EFAULT;
}
if ((offset + count) > length)
count = length - offset;
return bridge->master_write(image, buf, count, offset);
}
EXPORT_SYMBOL(vme_master_write);
/**
* vme_master_rmw - Perform read-modify-write cycle.
* @resource: Pointer to VME master resource.
* @mask: Bits to be compared and swapped in operation.
* @compare: Bits to be compared with data read from offset.
* @swap: Bits to be swapped in data read from offset.
* @offset: Offset into VME master window at which to perform operation.
*
* Perform read-modify-write cycle on provided location:
* - Location on VME bus is read.
* - Bits selected by mask are compared with compare.
* - Where a selected bit matches that in compare and are selected in swap,
* the bit is swapped.
* - Result written back to location on VME bus.
*
* Return: Bytes written on success, -EINVAL if resource is not a VME master
* resource or RMW operation is not supported. Hardware specific
* errors may also be returned.
*/
unsigned int vme_master_rmw(struct vme_resource *resource, unsigned int mask,
unsigned int compare, unsigned int swap, loff_t offset)
{
struct vme_bridge *bridge = find_bridge(resource);
struct vme_master_resource *image;
if (!bridge->master_rmw) {
printk(KERN_WARNING "Writing to resource not supported\n");
return -EINVAL;
}
if (resource->type != VME_MASTER) {
printk(KERN_ERR "Not a master resource\n");
return -EINVAL;
}
image = list_entry(resource->entry, struct vme_master_resource, list);
return bridge->master_rmw(image, mask, compare, swap, offset);
}
EXPORT_SYMBOL(vme_master_rmw);
/**
* vme_master_mmap - Mmap region of VME master window.
* @resource: Pointer to VME master resource.
* @vma: Pointer to definition of user mapping.
*
* Memory map a region of the VME master window into user space.
*
* Return: Zero on success, -EINVAL if resource is not a VME master
* resource or -EFAULT if map exceeds window size. Other generic mmap
* errors may also be returned.
*/
int vme_master_mmap(struct vme_resource *resource, struct vm_area_struct *vma)
{
struct vme_master_resource *image;
phys_addr_t phys_addr;
unsigned long vma_size;
if (resource->type != VME_MASTER) {
pr_err("Not a master resource\n");
return -EINVAL;
}
image = list_entry(resource->entry, struct vme_master_resource, list);
phys_addr = image->bus_resource.start + (vma->vm_pgoff << PAGE_SHIFT);
vma_size = vma->vm_end - vma->vm_start;
if (phys_addr + vma_size > image->bus_resource.end + 1) {
pr_err("Map size cannot exceed the window size\n");
return -EFAULT;
}
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
return vm_iomap_memory(vma, phys_addr, vma->vm_end - vma->vm_start);
}
EXPORT_SYMBOL(vme_master_mmap);
/**
* vme_master_free - Free VME master window
* @resource: Pointer to VME master resource.
*
* Free the provided master resource so that it may be reallocated.
*/
void vme_master_free(struct vme_resource *resource)
{
struct vme_master_resource *master_image;
if (resource->type != VME_MASTER) {
printk(KERN_ERR "Not a master resource\n");
return;
}
master_image = list_entry(resource->entry, struct vme_master_resource,
list);
if (!master_image) {
printk(KERN_ERR "Can't find master resource\n");
return;
}
/* Unlock image */
spin_lock(&master_image->lock);
if (master_image->locked == 0)
printk(KERN_ERR "Image is already free\n");
master_image->locked = 0;
spin_unlock(&master_image->lock);
/* Free up resource memory */
kfree(resource);
}
EXPORT_SYMBOL(vme_master_free);
/**
* vme_dma_request - Request a DMA controller.
* @vdev: Pointer to VME device struct vme_dev assigned to driver instance.
* @route: Required src/destination combination.
*
* Request a VME DMA controller with capability to perform transfers bewteen
* requested source/destination combination.
*
* Return: Pointer to VME DMA resource on success, NULL on failure.
*/
struct vme_resource *vme_dma_request(struct vme_dev *vdev, u32 route)
{
struct vme_bridge *bridge;
struct list_head *dma_pos = NULL;
struct vme_dma_resource *allocated_ctrlr = NULL;
struct vme_dma_resource *dma_ctrlr = NULL;
struct vme_resource *resource = NULL;
/* XXX Not checking resource attributes */
printk(KERN_ERR "No VME resource Attribute tests done\n");
bridge = vdev->bridge;
if (!bridge) {
printk(KERN_ERR "Can't find VME bus\n");
goto err_bus;
}
/* Loop through DMA resources */
list_for_each(dma_pos, &bridge->dma_resources) {
dma_ctrlr = list_entry(dma_pos,
struct vme_dma_resource, list);
if (!dma_ctrlr) {
printk(KERN_ERR "Registered NULL DMA resource\n");
continue;
}
/* Find an unlocked and compatible controller */
mutex_lock(&dma_ctrlr->mtx);
if (((dma_ctrlr->route_attr & route) == route) &&
(dma_ctrlr->locked == 0)) {
dma_ctrlr->locked = 1;
mutex_unlock(&dma_ctrlr->mtx);
allocated_ctrlr = dma_ctrlr;
break;
}
mutex_unlock(&dma_ctrlr->mtx);
}
/* Check to see if we found a resource */
if (!allocated_ctrlr)
goto err_ctrlr;
resource = kmalloc(sizeof(*resource), GFP_KERNEL);
if (!resource)
goto err_alloc;
resource->type = VME_DMA;
resource->entry = &allocated_ctrlr->list;
return resource;
err_alloc:
/* Unlock image */
mutex_lock(&dma_ctrlr->mtx);
dma_ctrlr->locked = 0;
mutex_unlock(&dma_ctrlr->mtx);
err_ctrlr:
err_bus:
return NULL;
}
EXPORT_SYMBOL(vme_dma_request);
/**
* vme_new_dma_list - Create new VME DMA list.
* @resource: Pointer to VME DMA resource.
*
* Create a new VME DMA list. It is the responsibility of the user to free
* the list once it is no longer required with vme_dma_list_free().
*
* Return: Pointer to new VME DMA list, NULL on allocation failure or invalid
* VME DMA resource.
*/
struct vme_dma_list *vme_new_dma_list(struct vme_resource *resource)
{
struct vme_dma_list *dma_list;
if (resource->type != VME_DMA) {
printk(KERN_ERR "Not a DMA resource\n");
return NULL;
}
dma_list = kmalloc(sizeof(*dma_list), GFP_KERNEL);
if (!dma_list)
return NULL;
INIT_LIST_HEAD(&dma_list->entries);
dma_list->parent = list_entry(resource->entry,
struct vme_dma_resource,
list);
mutex_init(&dma_list->mtx);
return dma_list;
}
EXPORT_SYMBOL(vme_new_dma_list);
/**
* vme_dma_pattern_attribute - Create "Pattern" type VME DMA list attribute.
* @pattern: Value to use used as pattern
* @type: Type of pattern to be written.
*
* Create VME DMA list attribute for pattern generation. It is the
* responsibility of the user to free used attributes using
* vme_dma_free_attribute().
*
* Return: Pointer to VME DMA attribute, NULL on failure.
*/
struct vme_dma_attr *vme_dma_pattern_attribute(u32 pattern, u32 type)
{
struct vme_dma_attr *attributes;
struct vme_dma_pattern *pattern_attr;
attributes = kmalloc(sizeof(*attributes), GFP_KERNEL);
if (!attributes)
goto err_attr;
pattern_attr = kmalloc(sizeof(*pattern_attr), GFP_KERNEL);
if (!pattern_attr)
goto err_pat;
attributes->type = VME_DMA_PATTERN;
attributes->private = (void *)pattern_attr;
pattern_attr->pattern = pattern;
pattern_attr->type = type;
return attributes;
err_pat:
kfree(attributes);
err_attr:
return NULL;
}
EXPORT_SYMBOL(vme_dma_pattern_attribute);
/**
* vme_dma_pci_attribute - Create "PCI" type VME DMA list attribute.
* @address: PCI base address for DMA transfer.
*
* Create VME DMA list attribute pointing to a location on PCI for DMA
* transfers. It is the responsibility of the user to free used attributes
* using vme_dma_free_attribute().
*
* Return: Pointer to VME DMA attribute, NULL on failure.
*/
struct vme_dma_attr *vme_dma_pci_attribute(dma_addr_t address)
{
struct vme_dma_attr *attributes;
struct vme_dma_pci *pci_attr;
/* XXX Run some sanity checks here */
attributes = kmalloc(sizeof(*attributes), GFP_KERNEL);
if (!attributes)
goto err_attr;
pci_attr = kmalloc(sizeof(*pci_attr), GFP_KERNEL);
if (!pci_attr)
goto err_pci;
attributes->type = VME_DMA_PCI;
attributes->private = (void *)pci_attr;
pci_attr->address = address;
return attributes;
err_pci:
kfree(attributes);
err_attr:
return NULL;
}
EXPORT_SYMBOL(vme_dma_pci_attribute);
/**
* vme_dma_vme_attribute - Create "VME" type VME DMA list attribute.
* @address: VME base address for DMA transfer.
* @aspace: VME address space to use for DMA transfer.
* @cycle: VME bus cycle to use for DMA transfer.
* @dwidth: VME data width to use for DMA transfer.
*
* Create VME DMA list attribute pointing to a location on the VME bus for DMA
* transfers. It is the responsibility of the user to free used attributes
* using vme_dma_free_attribute().
*
* Return: Pointer to VME DMA attribute, NULL on failure.
*/
struct vme_dma_attr *vme_dma_vme_attribute(unsigned long long address,
u32 aspace, u32 cycle, u32 dwidth)
{
struct vme_dma_attr *attributes;
struct vme_dma_vme *vme_attr;
attributes = kmalloc(sizeof(*attributes), GFP_KERNEL);
if (!attributes)
goto err_attr;
vme_attr = kmalloc(sizeof(*vme_attr), GFP_KERNEL);
if (!vme_attr)
goto err_vme;
attributes->type = VME_DMA_VME;
attributes->private = (void *)vme_attr;
vme_attr->address = address;
vme_attr->aspace = aspace;
vme_attr->cycle = cycle;
vme_attr->dwidth = dwidth;
return attributes;
err_vme:
kfree(attributes);
err_attr:
return NULL;
}
EXPORT_SYMBOL(vme_dma_vme_attribute);
/**
* vme_dma_free_attribute - Free DMA list attribute.
* @attributes: Pointer to DMA list attribute.
*
* Free VME DMA list attribute. VME DMA list attributes can be safely freed
* once vme_dma_list_add() has returned.
*/
void vme_dma_free_attribute(struct vme_dma_attr *attributes)
{
kfree(attributes->private);
kfree(attributes);
}
EXPORT_SYMBOL(vme_dma_free_attribute);
/**
* vme_dma_list_add - Add enty to a VME DMA list.
* @list: Pointer to VME list.
* @src: Pointer to DMA list attribute to use as source.
* @dest: Pointer to DMA list attribute to use as destination.
* @count: Number of bytes to transfer.
*
* Add an entry to the provided VME DMA list. Entry requires pointers to source
* and destination DMA attributes and a count.
*
* Please note, the attributes supported as source and destinations for
* transfers are hardware dependent.
*
* Return: Zero on success, -EINVAL if operation is not supported on this
* device or if the link list has already been submitted for execution.
* Hardware specific errors also possible.
*/
int vme_dma_list_add(struct vme_dma_list *list, struct vme_dma_attr *src,
struct vme_dma_attr *dest, size_t count)
{
struct vme_bridge *bridge = list->parent->parent;
int retval;
if (!bridge->dma_list_add) {
printk(KERN_WARNING "Link List DMA generation not supported\n");
return -EINVAL;
}
if (!mutex_trylock(&list->mtx)) {
printk(KERN_ERR "Link List already submitted\n");
return -EINVAL;
}
retval = bridge->dma_list_add(list, src, dest, count);
mutex_unlock(&list->mtx);
return retval;
}
EXPORT_SYMBOL(vme_dma_list_add);
/**
* vme_dma_list_exec - Queue a VME DMA list for execution.
* @list: Pointer to VME list.
*
* Queue the provided VME DMA list for execution. The call will return once the
* list has been executed.
*
* Return: Zero on success, -EINVAL if operation is not supported on this
* device. Hardware specific errors also possible.
*/
int vme_dma_list_exec(struct vme_dma_list *list)
{
struct vme_bridge *bridge = list->parent->parent;
int retval;
if (!bridge->dma_list_exec) {
printk(KERN_ERR "Link List DMA execution not supported\n");
return -EINVAL;
}
mutex_lock(&list->mtx);
retval = bridge->dma_list_exec(list);
mutex_unlock(&list->mtx);
return retval;
}
EXPORT_SYMBOL(vme_dma_list_exec);
/**
* vme_dma_list_free - Free a VME DMA list.
* @list: Pointer to VME list.
*
* Free the provided DMA list and all its entries.
*
* Return: Zero on success, -EINVAL on invalid VME resource, -EBUSY if resource
* is still in use. Hardware specific errors also possible.
*/
int vme_dma_list_free(struct vme_dma_list *list)
{
struct vme_bridge *bridge = list->parent->parent;
int retval;
if (!bridge->dma_list_empty) {
printk(KERN_WARNING "Emptying of Link Lists not supported\n");
return -EINVAL;
}
if (!mutex_trylock(&list->mtx)) {
printk(KERN_ERR "Link List in use\n");
return -EBUSY;
}
/*
* Empty out all of the entries from the DMA list. We need to go to the
* low level driver as DMA entries are driver specific.
*/
retval = bridge->dma_list_empty(list);
if (retval) {
printk(KERN_ERR "Unable to empty link-list entries\n");
mutex_unlock(&list->mtx);
return retval;
}
mutex_unlock(&list->mtx);
kfree(list);
return retval;
}
EXPORT_SYMBOL(vme_dma_list_free);
/**
* vme_dma_free - Free a VME DMA resource.
* @resource: Pointer to VME DMA resource.
*
* Free the provided DMA resource so that it may be reallocated.
*
* Return: Zero on success, -EINVAL on invalid VME resource, -EBUSY if resource
* is still active.
*/
int vme_dma_free(struct vme_resource *resource)
{
struct vme_dma_resource *ctrlr;
if (resource->type != VME_DMA) {
printk(KERN_ERR "Not a DMA resource\n");
return -EINVAL;
}
ctrlr = list_entry(resource->entry, struct vme_dma_resource, list);
if (!mutex_trylock(&ctrlr->mtx)) {
printk(KERN_ERR "Resource busy, can't free\n");
return -EBUSY;
}
if (!(list_empty(&ctrlr->pending) && list_empty(&ctrlr->running))) {
printk(KERN_WARNING "Resource still processing transfers\n");
mutex_unlock(&ctrlr->mtx);
return -EBUSY;
}
ctrlr->locked = 0;
mutex_unlock(&ctrlr->mtx);
kfree(resource);
return 0;
}
EXPORT_SYMBOL(vme_dma_free);
void vme_bus_error_handler(struct vme_bridge *bridge,
unsigned long long address, int am)
{
struct list_head *handler_pos = NULL;
struct vme_error_handler *handler;
int handler_triggered = 0;
u32 aspace = vme_get_aspace(am);
list_for_each(handler_pos, &bridge->vme_error_handlers) {
handler = list_entry(handler_pos, struct vme_error_handler,
list);
if ((aspace == handler->aspace) &&
(address >= handler->start) &&
(address < handler->end)) {
if (!handler->num_errors)
handler->first_error = address;
if (handler->num_errors != UINT_MAX)
handler->num_errors++;
handler_triggered = 1;
}
}
if (!handler_triggered)
dev_err(bridge->parent,
"Unhandled VME access error at address 0x%llx\n",
address);
}
EXPORT_SYMBOL(vme_bus_error_handler);
struct vme_error_handler *vme_register_error_handler(
struct vme_bridge *bridge, u32 aspace,
unsigned long long address, size_t len)
{
struct vme_error_handler *handler;
handler = kmalloc(sizeof(*handler), GFP_ATOMIC);
if (!handler)
return NULL;
handler->aspace = aspace;
handler->start = address;
handler->end = address + len;
handler->num_errors = 0;
handler->first_error = 0;
list_add_tail(&handler->list, &bridge->vme_error_handlers);
return handler;
}
EXPORT_SYMBOL(vme_register_error_handler);
void vme_unregister_error_handler(struct vme_error_handler *handler)
{
list_del(&handler->list);
kfree(handler);
}
EXPORT_SYMBOL(vme_unregister_error_handler);
void vme_irq_handler(struct vme_bridge *bridge, int level, int statid)
{
void (*call)(int, int, void *);
void *priv_data;
call = bridge->irq[level - 1].callback[statid].func;
priv_data = bridge->irq[level - 1].callback[statid].priv_data;
if (call)
call(level, statid, priv_data);
else
printk(KERN_WARNING "Spurious VME interrupt, level:%x, vector:%x\n",
level, statid);
}
EXPORT_SYMBOL(vme_irq_handler);
/**
* vme_irq_request - Request a specific VME interrupt.
* @vdev: Pointer to VME device struct vme_dev assigned to driver instance.
* @level: Interrupt priority being requested.
* @statid: Interrupt vector being requested.
* @callback: Pointer to callback function called when VME interrupt/vector
* received.
* @priv_data: Generic pointer that will be passed to the callback function.
*
* Request callback to be attached as a handler for VME interrupts with provided
* level and statid.
*
* Return: Zero on success, -EINVAL on invalid vme device, level or if the
* function is not supported, -EBUSY if the level/statid combination is
* already in use. Hardware specific errors also possible.
*/
int vme_irq_request(struct vme_dev *vdev, int level, int statid,
void (*callback)(int, int, void *),
void *priv_data)
{
struct vme_bridge *bridge;
bridge = vdev->bridge;
if (!bridge) {
printk(KERN_ERR "Can't find VME bus\n");
return -EINVAL;
}
if ((level < 1) || (level > 7)) {
printk(KERN_ERR "Invalid interrupt level\n");
return -EINVAL;
}
if (!bridge->irq_set) {
printk(KERN_ERR "Configuring interrupts not supported\n");
return -EINVAL;
}
mutex_lock(&bridge->irq_mtx);
if (bridge->irq[level - 1].callback[statid].func) {
mutex_unlock(&bridge->irq_mtx);
printk(KERN_WARNING "VME Interrupt already taken\n");
return -EBUSY;
}
bridge->irq[level - 1].count++;
bridge->irq[level - 1].callback[statid].priv_data = priv_data;
bridge->irq[level - 1].callback[statid].func = callback;
/* Enable IRQ level */
bridge->irq_set(bridge, level, 1, 1);
mutex_unlock(&bridge->irq_mtx);
return 0;
}
EXPORT_SYMBOL(vme_irq_request);
/**
* vme_irq_free - Free a VME interrupt.
* @vdev: Pointer to VME device struct vme_dev assigned to driver instance.
* @level: Interrupt priority of interrupt being freed.
* @statid: Interrupt vector of interrupt being freed.
*
* Remove previously attached callback from VME interrupt priority/vector.
*/
void vme_irq_free(struct vme_dev *vdev, int level, int statid)
{
struct vme_bridge *bridge;
bridge = vdev->bridge;
if (!bridge) {
printk(KERN_ERR "Can't find VME bus\n");
return;
}
if ((level < 1) || (level > 7)) {
printk(KERN_ERR "Invalid interrupt level\n");
return;
}
if (!bridge->irq_set) {
printk(KERN_ERR "Configuring interrupts not supported\n");
return;
}
mutex_lock(&bridge->irq_mtx);
bridge->irq[level - 1].count--;
/* Disable IRQ level if no more interrupts attached at this level*/
if (bridge->irq[level - 1].count == 0)
bridge->irq_set(bridge, level, 0, 1);
bridge->irq[level - 1].callback[statid].func = NULL;
bridge->irq[level - 1].callback[statid].priv_data = NULL;
mutex_unlock(&bridge->irq_mtx);
}
EXPORT_SYMBOL(vme_irq_free);
/**
* vme_irq_generate - Generate VME interrupt.
* @vdev: Pointer to VME device struct vme_dev assigned to driver instance.
* @level: Interrupt priority at which to assert the interrupt.
* @statid: Interrupt vector to associate with the interrupt.
*
* Generate a VME interrupt of the provided level and with the provided
* statid.
*
* Return: Zero on success, -EINVAL on invalid vme device, level or if the
* function is not supported. Hardware specific errors also possible.
*/
int vme_irq_generate(struct vme_dev *vdev, int level, int statid)
{
struct vme_bridge *bridge;
bridge = vdev->bridge;
if (!bridge) {
printk(KERN_ERR "Can't find VME bus\n");
return -EINVAL;
}
if ((level < 1) || (level > 7)) {
printk(KERN_WARNING "Invalid interrupt level\n");
return -EINVAL;
}
if (!bridge->irq_generate) {
printk(KERN_WARNING "Interrupt generation not supported\n");
return -EINVAL;
}
return bridge->irq_generate(bridge, level, statid);
}
EXPORT_SYMBOL(vme_irq_generate);
/**
* vme_lm_request - Request a VME location monitor
* @vdev: Pointer to VME device struct vme_dev assigned to driver instance.
*
* Allocate a location monitor resource to the driver. A location monitor
* allows the driver to monitor accesses to a contiguous number of
* addresses on the VME bus.
*
* Return: Pointer to a VME resource on success or NULL on failure.
*/
struct vme_resource *vme_lm_request(struct vme_dev *vdev)
{
struct vme_bridge *bridge;
struct list_head *lm_pos = NULL;
struct vme_lm_resource *allocated_lm = NULL;
struct vme_lm_resource *lm = NULL;
struct vme_resource *resource = NULL;
bridge = vdev->bridge;
if (!bridge) {
printk(KERN_ERR "Can't find VME bus\n");
goto err_bus;
}
/* Loop through LM resources */
list_for_each(lm_pos, &bridge->lm_resources) {
lm = list_entry(lm_pos,
struct vme_lm_resource, list);
if (!lm) {
printk(KERN_ERR "Registered NULL Location Monitor resource\n");
continue;
}
/* Find an unlocked controller */
mutex_lock(&lm->mtx);
if (lm->locked == 0) {
lm->locked = 1;
mutex_unlock(&lm->mtx);
allocated_lm = lm;
break;
}
mutex_unlock(&lm->mtx);
}
/* Check to see if we found a resource */
if (!allocated_lm)
goto err_lm;
resource = kmalloc(sizeof(*resource), GFP_KERNEL);
if (!resource)
goto err_alloc;
resource->type = VME_LM;
resource->entry = &allocated_lm->list;
return resource;
err_alloc:
/* Unlock image */
mutex_lock(&lm->mtx);
lm->locked = 0;
mutex_unlock(&lm->mtx);
err_lm:
err_bus:
return NULL;
}
EXPORT_SYMBOL(vme_lm_request);
/**
* vme_lm_count - Determine number of VME Addresses monitored
* @resource: Pointer to VME location monitor resource.
*
* The number of contiguous addresses monitored is hardware dependent.
* Return the number of contiguous addresses monitored by the
* location monitor.
*
* Return: Count of addresses monitored or -EINVAL when provided with an
* invalid location monitor resource.
*/
int vme_lm_count(struct vme_resource *resource)
{
struct vme_lm_resource *lm;
if (resource->type != VME_LM) {
printk(KERN_ERR "Not a Location Monitor resource\n");
return -EINVAL;
}
lm = list_entry(resource->entry, struct vme_lm_resource, list);
return lm->monitors;
}
EXPORT_SYMBOL(vme_lm_count);
/**
* vme_lm_set - Configure location monitor
* @resource: Pointer to VME location monitor resource.
* @lm_base: Base address to monitor.
* @aspace: VME address space to monitor.
* @cycle: VME bus cycle type to monitor.
*
* Set the base address, address space and cycle type of accesses to be
* monitored by the location monitor.
*
* Return: Zero on success, -EINVAL when provided with an invalid location
* monitor resource or function is not supported. Hardware specific
* errors may also be returned.
*/
int vme_lm_set(struct vme_resource *resource, unsigned long long lm_base,
u32 aspace, u32 cycle)
{
struct vme_bridge *bridge = find_bridge(resource);
struct vme_lm_resource *lm;
if (resource->type != VME_LM) {
printk(KERN_ERR "Not a Location Monitor resource\n");
return -EINVAL;
}
lm = list_entry(resource->entry, struct vme_lm_resource, list);
if (!bridge->lm_set) {
printk(KERN_ERR "vme_lm_set not supported\n");
return -EINVAL;
}
return bridge->lm_set(lm, lm_base, aspace, cycle);
}
EXPORT_SYMBOL(vme_lm_set);
/**
* vme_lm_get - Retrieve location monitor settings
* @resource: Pointer to VME location monitor resource.
* @lm_base: Pointer used to output the base address monitored.
* @aspace: Pointer used to output the address space monitored.
* @cycle: Pointer used to output the VME bus cycle type monitored.
*
* Retrieve the base address, address space and cycle type of accesses to
* be monitored by the location monitor.
*
* Return: Zero on success, -EINVAL when provided with an invalid location
* monitor resource or function is not supported. Hardware specific
* errors may also be returned.
*/
int vme_lm_get(struct vme_resource *resource, unsigned long long *lm_base,
u32 *aspace, u32 *cycle)
{
struct vme_bridge *bridge = find_bridge(resource);
struct vme_lm_resource *lm;
if (resource->type != VME_LM) {
printk(KERN_ERR "Not a Location Monitor resource\n");
return -EINVAL;
}
lm = list_entry(resource->entry, struct vme_lm_resource, list);
if (!bridge->lm_get) {
printk(KERN_ERR "vme_lm_get not supported\n");
return -EINVAL;
}
return bridge->lm_get(lm, lm_base, aspace, cycle);
}
EXPORT_SYMBOL(vme_lm_get);
/**
* vme_lm_attach - Provide callback for location monitor address
* @resource: Pointer to VME location monitor resource.
* @monitor: Offset to which callback should be attached.
* @callback: Pointer to callback function called when triggered.
* @data: Generic pointer that will be passed to the callback function.
*
* Attach a callback to the specificed offset into the location monitors
* monitored addresses. A generic pointer is provided to allow data to be
* passed to the callback when called.
*
* Return: Zero on success, -EINVAL when provided with an invalid location
* monitor resource or function is not supported. Hardware specific
* errors may also be returned.
*/
int vme_lm_attach(struct vme_resource *resource, int monitor,
void (*callback)(void *), void *data)
{
struct vme_bridge *bridge = find_bridge(resource);
struct vme_lm_resource *lm;
if (resource->type != VME_LM) {
printk(KERN_ERR "Not a Location Monitor resource\n");
return -EINVAL;
}
lm = list_entry(resource->entry, struct vme_lm_resource, list);
if (!bridge->lm_attach) {
printk(KERN_ERR "vme_lm_attach not supported\n");
return -EINVAL;
}
return bridge->lm_attach(lm, monitor, callback, data);
}
EXPORT_SYMBOL(vme_lm_attach);
/**
* vme_lm_detach - Remove callback for location monitor address
* @resource: Pointer to VME location monitor resource.
* @monitor: Offset to which callback should be removed.
*
* Remove the callback associated with the specificed offset into the
* location monitors monitored addresses.
*
* Return: Zero on success, -EINVAL when provided with an invalid location
* monitor resource or function is not supported. Hardware specific
* errors may also be returned.
*/
int vme_lm_detach(struct vme_resource *resource, int monitor)
{
struct vme_bridge *bridge = find_bridge(resource);
struct vme_lm_resource *lm;
if (resource->type != VME_LM) {
printk(KERN_ERR "Not a Location Monitor resource\n");
return -EINVAL;
}
lm = list_entry(resource->entry, struct vme_lm_resource, list);
if (!bridge->lm_detach) {
printk(KERN_ERR "vme_lm_detach not supported\n");
return -EINVAL;
}
return bridge->lm_detach(lm, monitor);
}
EXPORT_SYMBOL(vme_lm_detach);
/**
* vme_lm_free - Free allocated VME location monitor
* @resource: Pointer to VME location monitor resource.
*
* Free allocation of a VME location monitor.
*
* WARNING: This function currently expects that any callbacks that have
* been attached to the location monitor have been removed.
*
* Return: Zero on success, -EINVAL when provided with an invalid location
* monitor resource.
*/
void vme_lm_free(struct vme_resource *resource)
{
struct vme_lm_resource *lm;
if (resource->type != VME_LM) {
printk(KERN_ERR "Not a Location Monitor resource\n");
return;
}
lm = list_entry(resource->entry, struct vme_lm_resource, list);
mutex_lock(&lm->mtx);
/* XXX
* Check to see that there aren't any callbacks still attached, if
* there are we should probably be detaching them!
*/
lm->locked = 0;
mutex_unlock(&lm->mtx);
kfree(resource);
}
EXPORT_SYMBOL(vme_lm_free);
/**
* vme_slot_num - Retrieve slot ID
* @vdev: Pointer to VME device struct vme_dev assigned to driver instance.
*
* Retrieve the slot ID associated with the provided VME device.
*
* Return: The slot ID on success, -EINVAL if VME bridge cannot be determined
* or the function is not supported. Hardware specific errors may also
* be returned.
*/
int vme_slot_num(struct vme_dev *vdev)
{
struct vme_bridge *bridge;
bridge = vdev->bridge;
if (!bridge) {
printk(KERN_ERR "Can't find VME bus\n");
return -EINVAL;
}
if (!bridge->slot_get) {
printk(KERN_WARNING "vme_slot_num not supported\n");
return -EINVAL;
}
return bridge->slot_get(bridge);
}
EXPORT_SYMBOL(vme_slot_num);
/**
* vme_bus_num - Retrieve bus number
* @vdev: Pointer to VME device struct vme_dev assigned to driver instance.
*
* Retrieve the bus enumeration associated with the provided VME device.
*
* Return: The bus number on success, -EINVAL if VME bridge cannot be
* determined.
*/
int vme_bus_num(struct vme_dev *vdev)
{
struct vme_bridge *bridge;
bridge = vdev->bridge;
if (!bridge) {
pr_err("Can't find VME bus\n");
return -EINVAL;
}
return bridge->num;
}
EXPORT_SYMBOL(vme_bus_num);
/* - Bridge Registration --------------------------------------------------- */
static void vme_dev_release(struct device *dev)
{
kfree(dev_to_vme_dev(dev));
}
/* Common bridge initialization */
struct vme_bridge *vme_init_bridge(struct vme_bridge *bridge)
{
INIT_LIST_HEAD(&bridge->vme_error_handlers);
INIT_LIST_HEAD(&bridge->master_resources);
INIT_LIST_HEAD(&bridge->slave_resources);
INIT_LIST_HEAD(&bridge->dma_resources);
INIT_LIST_HEAD(&bridge->lm_resources);
mutex_init(&bridge->irq_mtx);
return bridge;
}
EXPORT_SYMBOL(vme_init_bridge);
int vme_register_bridge(struct vme_bridge *bridge)
{
int i;
int ret = -1;
mutex_lock(&vme_buses_lock);
for (i = 0; i < sizeof(vme_bus_numbers) * 8; i++) {
if ((vme_bus_numbers & (1 << i)) == 0) {
vme_bus_numbers |= (1 << i);
bridge->num = i;
INIT_LIST_HEAD(&bridge->devices);
list_add_tail(&bridge->bus_list, &vme_bus_list);
ret = 0;
break;
}
}
mutex_unlock(&vme_buses_lock);
return ret;
}
EXPORT_SYMBOL(vme_register_bridge);
void vme_unregister_bridge(struct vme_bridge *bridge)
{
struct vme_dev *vdev;
struct vme_dev *tmp;
mutex_lock(&vme_buses_lock);
vme_bus_numbers &= ~(1 << bridge->num);
list_for_each_entry_safe(vdev, tmp, &bridge->devices, bridge_list) {
list_del(&vdev->drv_list);
list_del(&vdev->bridge_list);
device_unregister(&vdev->dev);
}
list_del(&bridge->bus_list);
mutex_unlock(&vme_buses_lock);
}
EXPORT_SYMBOL(vme_unregister_bridge);
/* - Driver Registration --------------------------------------------------- */
static int __vme_register_driver_bus(struct vme_driver *drv,
struct vme_bridge *bridge, unsigned int ndevs)
{
int err;
unsigned int i;
struct vme_dev *vdev;
struct vme_dev *tmp;
for (i = 0; i < ndevs; i++) {
vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
if (!vdev) {
err = -ENOMEM;
goto err_devalloc;
}
vdev->num = i;
vdev->bridge = bridge;
vdev->dev.platform_data = drv;
vdev->dev.release = vme_dev_release;
vdev->dev.parent = bridge->parent;
vdev->dev.bus = &vme_bus_type;
dev_set_name(&vdev->dev, "%s.%u-%u", drv->name, bridge->num,
vdev->num);
err = device_register(&vdev->dev);
if (err)
goto err_reg;
if (vdev->dev.platform_data) {
list_add_tail(&vdev->drv_list, &drv->devices);
list_add_tail(&vdev->bridge_list, &bridge->devices);
} else
device_unregister(&vdev->dev);
}
return 0;
err_reg:
put_device(&vdev->dev);
kfree(vdev);
err_devalloc:
list_for_each_entry_safe(vdev, tmp, &drv->devices, drv_list) {
list_del(&vdev->drv_list);
list_del(&vdev->bridge_list);
device_unregister(&vdev->dev);
}
return err;
}
static int __vme_register_driver(struct vme_driver *drv, unsigned int ndevs)
{
struct vme_bridge *bridge;
int err = 0;
mutex_lock(&vme_buses_lock);
list_for_each_entry(bridge, &vme_bus_list, bus_list) {
/*
* This cannot cause trouble as we already have vme_buses_lock
* and if the bridge is removed, it will have to go through
* vme_unregister_bridge() to do it (which calls remove() on
* the bridge which in turn tries to acquire vme_buses_lock and
* will have to wait).
*/
err = __vme_register_driver_bus(drv, bridge, ndevs);
if (err)
break;
}
mutex_unlock(&vme_buses_lock);
return err;
}
/**
* vme_register_driver - Register a VME driver
* @drv: Pointer to VME driver structure to register.
* @ndevs: Maximum number of devices to allow to be enumerated.
*
* Register a VME device driver with the VME subsystem.
*
* Return: Zero on success, error value on registration failure.
*/
int vme_register_driver(struct vme_driver *drv, unsigned int ndevs)
{
int err;
drv->driver.name = drv->name;
drv->driver.bus = &vme_bus_type;
INIT_LIST_HEAD(&drv->devices);
err = driver_register(&drv->driver);
if (err)
return err;
err = __vme_register_driver(drv, ndevs);
if (err)
driver_unregister(&drv->driver);
return err;
}
EXPORT_SYMBOL(vme_register_driver);
/**
* vme_unregister_driver - Unregister a VME driver
* @drv: Pointer to VME driver structure to unregister.
*
* Unregister a VME device driver from the VME subsystem.
*/
void vme_unregister_driver(struct vme_driver *drv)
{
struct vme_dev *dev, *dev_tmp;
mutex_lock(&vme_buses_lock);
list_for_each_entry_safe(dev, dev_tmp, &drv->devices, drv_list) {
list_del(&dev->drv_list);
list_del(&dev->bridge_list);
device_unregister(&dev->dev);
}
mutex_unlock(&vme_buses_lock);
driver_unregister(&drv->driver);
}
EXPORT_SYMBOL(vme_unregister_driver);
/* - Bus Registration ------------------------------------------------------ */
static int vme_bus_match(struct device *dev, struct device_driver *drv)
{
struct vme_driver *vme_drv;
vme_drv = container_of(drv, struct vme_driver, driver);
if (dev->platform_data == vme_drv) {
struct vme_dev *vdev = dev_to_vme_dev(dev);
if (vme_drv->match && vme_drv->match(vdev))
return 1;
dev->platform_data = NULL;
}
return 0;
}
static int vme_bus_probe(struct device *dev)
{
struct vme_driver *driver;
struct vme_dev *vdev = dev_to_vme_dev(dev);
driver = dev->platform_data;
if (driver->probe)
return driver->probe(vdev);
return -ENODEV;
}
static int vme_bus_remove(struct device *dev)
{
struct vme_driver *driver;
struct vme_dev *vdev = dev_to_vme_dev(dev);
driver = dev->platform_data;
if (driver->remove)
return driver->remove(vdev);
return -ENODEV;
}
struct bus_type vme_bus_type = {
.name = "vme",
.match = vme_bus_match,
.probe = vme_bus_probe,
.remove = vme_bus_remove,
};
EXPORT_SYMBOL(vme_bus_type);
static int __init vme_init(void)
{
return bus_register(&vme_bus_type);
}
subsys_initcall(vme_init);
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