linux/drivers/ieee1394/highlevel.c

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/*
* IEEE 1394 for Linux
*
* Copyright (C) 1999 Andreas E. Bombe
*
* This code is licensed under the GPL. See the file COPYING in the root
* directory of the kernel sources for details.
*
*
* Contributions:
*
* Christian Toegel <christian.toegel@gmx.at>
* unregister address space
*
* Manfred Weihs <weihs@ict.tuwien.ac.at>
* unregister address space
*
*/
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/bitops.h>
#include "ieee1394.h"
#include "ieee1394_types.h"
#include "hosts.h"
#include "ieee1394_core.h"
#include "highlevel.h"
#include "nodemgr.h"
struct hl_host_info {
struct list_head list;
struct hpsb_host *host;
size_t size;
unsigned long key;
void *data;
};
static LIST_HEAD(hl_drivers);
static DECLARE_RWSEM(hl_drivers_sem);
static LIST_HEAD(hl_irqs);
static DEFINE_RWLOCK(hl_irqs_lock);
static DEFINE_RWLOCK(addr_space_lock);
/* addr_space list will have zero and max already included as bounds */
static struct hpsb_address_ops dummy_ops = { NULL, NULL, NULL, NULL };
static struct hpsb_address_serve dummy_zero_addr, dummy_max_addr;
static struct hl_host_info *hl_get_hostinfo(struct hpsb_highlevel *hl,
struct hpsb_host *host)
{
struct hl_host_info *hi = NULL;
if (!hl || !host)
return NULL;
read_lock(&hl->host_info_lock);
list_for_each_entry(hi, &hl->host_info_list, list) {
if (hi->host == host) {
read_unlock(&hl->host_info_lock);
return hi;
}
}
read_unlock(&hl->host_info_lock);
return NULL;
}
/**
* hpsb_get_hostinfo - retrieve a hostinfo pointer bound to this driver/host
*
* Returns a per @host and @hl driver data structure that was previously stored
* by hpsb_create_hostinfo.
*/
void *hpsb_get_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host)
{
struct hl_host_info *hi = hl_get_hostinfo(hl, host);
return hi ? hi->data : NULL;
}
/**
* hpsb_create_hostinfo - allocate a hostinfo pointer bound to this driver/host
*
* Allocate a hostinfo pointer backed by memory with @data_size and bind it to
* to this @hl driver and @host. If @data_size is zero, then the return here is
* only valid for error checking.
*/
void *hpsb_create_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host,
size_t data_size)
{
struct hl_host_info *hi;
void *data;
unsigned long flags;
hi = hl_get_hostinfo(hl, host);
if (hi) {
HPSB_ERR("%s called hpsb_create_hostinfo when hostinfo already"
" exists", hl->name);
return NULL;
}
hi = kzalloc(sizeof(*hi) + data_size, GFP_ATOMIC);
if (!hi)
return NULL;
if (data_size) {
data = hi->data = hi + 1;
hi->size = data_size;
} else
data = hi;
hi->host = host;
write_lock_irqsave(&hl->host_info_lock, flags);
list_add_tail(&hi->list, &hl->host_info_list);
write_unlock_irqrestore(&hl->host_info_lock, flags);
return data;
}
/**
* hpsb_set_hostinfo - set the hostinfo pointer to something useful
*
* Usually follows a call to hpsb_create_hostinfo, where the size is 0.
*/
int hpsb_set_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host,
void *data)
{
struct hl_host_info *hi;
hi = hl_get_hostinfo(hl, host);
if (hi) {
if (!hi->size && !hi->data) {
hi->data = data;
return 0;
} else
HPSB_ERR("%s called hpsb_set_hostinfo when hostinfo "
"already has data", hl->name);
} else
HPSB_ERR("%s called hpsb_set_hostinfo when no hostinfo exists",
hl->name);
return -EINVAL;
}
/**
* hpsb_destroy_hostinfo - free and remove a hostinfo pointer
*
* Free and remove the hostinfo pointer bound to this @hl driver and @host.
*/
void hpsb_destroy_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host)
{
struct hl_host_info *hi;
hi = hl_get_hostinfo(hl, host);
if (hi) {
unsigned long flags;
write_lock_irqsave(&hl->host_info_lock, flags);
list_del(&hi->list);
write_unlock_irqrestore(&hl->host_info_lock, flags);
kfree(hi);
}
return;
}
/**
* hpsb_set_hostinfo_key - set an alternate lookup key for an hostinfo
*
* Sets an alternate lookup key for the hostinfo bound to this @hl driver and
* @host.
*/
void hpsb_set_hostinfo_key(struct hpsb_highlevel *hl, struct hpsb_host *host,
unsigned long key)
{
struct hl_host_info *hi;
hi = hl_get_hostinfo(hl, host);
if (hi)
hi->key = key;
return;
}
/**
* hpsb_get_hostinfo_bykey - retrieve a hostinfo pointer by its alternate key
*/
void *hpsb_get_hostinfo_bykey(struct hpsb_highlevel *hl, unsigned long key)
{
struct hl_host_info *hi;
void *data = NULL;
if (!hl)
return NULL;
read_lock(&hl->host_info_lock);
list_for_each_entry(hi, &hl->host_info_list, list) {
if (hi->key == key) {
data = hi->data;
break;
}
}
read_unlock(&hl->host_info_lock);
return data;
}
static int highlevel_for_each_host_reg(struct hpsb_host *host, void *__data)
{
struct hpsb_highlevel *hl = __data;
hl->add_host(host);
if (host->update_config_rom && hpsb_update_config_rom_image(host) < 0)
HPSB_ERR("Failed to generate Configuration ROM image for host "
"%s-%d", hl->name, host->id);
return 0;
}
/**
* hpsb_register_highlevel - register highlevel driver
*
* The name pointer in @hl has to stay valid at all times because the string is
* not copied.
*/
void hpsb_register_highlevel(struct hpsb_highlevel *hl)
{
unsigned long flags;
INIT_LIST_HEAD(&hl->addr_list);
INIT_LIST_HEAD(&hl->host_info_list);
rwlock_init(&hl->host_info_lock);
down_write(&hl_drivers_sem);
list_add_tail(&hl->hl_list, &hl_drivers);
up_write(&hl_drivers_sem);
write_lock_irqsave(&hl_irqs_lock, flags);
list_add_tail(&hl->irq_list, &hl_irqs);
write_unlock_irqrestore(&hl_irqs_lock, flags);
if (hl->add_host)
nodemgr_for_each_host(hl, highlevel_for_each_host_reg);
return;
}
static void __delete_addr(struct hpsb_address_serve *as)
{
list_del(&as->host_list);
list_del(&as->hl_list);
kfree(as);
}
static void __unregister_host(struct hpsb_highlevel *hl, struct hpsb_host *host,
int update_cr)
{
unsigned long flags;
struct list_head *lh, *next;
struct hpsb_address_serve *as;
/* First, let the highlevel driver unreg */
if (hl->remove_host)
hl->remove_host(host);
/* Remove any addresses that are matched for this highlevel driver
* and this particular host. */
write_lock_irqsave(&addr_space_lock, flags);
list_for_each_safe (lh, next, &hl->addr_list) {
as = list_entry(lh, struct hpsb_address_serve, hl_list);
if (as->host == host)
__delete_addr(as);
}
write_unlock_irqrestore(&addr_space_lock, flags);
/* Now update the config-rom to reflect anything removed by the
* highlevel driver. */
if (update_cr && host->update_config_rom &&
hpsb_update_config_rom_image(host) < 0)
HPSB_ERR("Failed to generate Configuration ROM image for host "
"%s-%d", hl->name, host->id);
/* Finally remove all the host info associated between these two. */
hpsb_destroy_hostinfo(hl, host);
}
static int highlevel_for_each_host_unreg(struct hpsb_host *host, void *__data)
{
struct hpsb_highlevel *hl = __data;
__unregister_host(hl, host, 1);
return 0;
}
/**
* hpsb_unregister_highlevel - unregister highlevel driver
*/
void hpsb_unregister_highlevel(struct hpsb_highlevel *hl)
{
unsigned long flags;
write_lock_irqsave(&hl_irqs_lock, flags);
list_del(&hl->irq_list);
write_unlock_irqrestore(&hl_irqs_lock, flags);
down_write(&hl_drivers_sem);
list_del(&hl->hl_list);
up_write(&hl_drivers_sem);
nodemgr_for_each_host(hl, highlevel_for_each_host_unreg);
}
/**
* hpsb_allocate_and_register_addrspace - alloc' and reg' a host address space
*
* @start and @end are 48 bit pointers and have to be quadlet aligned.
* @end points to the first address behind the handled addresses. This
* function can be called multiple times for a single hpsb_highlevel @hl to
* implement sparse register sets. The requested region must not overlap any
* previously allocated region, otherwise registering will fail.
*
* It returns true for successful allocation. Address spaces can be
* unregistered with hpsb_unregister_addrspace. All remaining address spaces
* are automatically deallocated together with the hpsb_highlevel @hl.
*/
u64 hpsb_allocate_and_register_addrspace(struct hpsb_highlevel *hl,
struct hpsb_host *host,
struct hpsb_address_ops *ops,
u64 size, u64 alignment,
u64 start, u64 end)
{
struct hpsb_address_serve *as, *a1, *a2;
struct list_head *entry;
u64 retval = CSR1212_INVALID_ADDR_SPACE;
unsigned long flags;
u64 align_mask = ~(alignment - 1);
if ((alignment & 3) || (alignment > 0x800000000000ULL) ||
(hweight64(alignment) != 1)) {
HPSB_ERR("%s called with invalid alignment: 0x%048llx",
__func__, (unsigned long long)alignment);
return retval;
}
/* default range,
* avoids controller's posted write area (see OHCI 1.1 clause 1.5) */
if (start == CSR1212_INVALID_ADDR_SPACE &&
end == CSR1212_INVALID_ADDR_SPACE) {
start = host->middle_addr_space;
end = CSR1212_ALL_SPACE_END;
}
if (((start|end) & ~align_mask) || (start >= end) ||
(end > CSR1212_ALL_SPACE_END)) {
HPSB_ERR("%s called with invalid addresses "
"(start = %012Lx end = %012Lx)", __func__,
(unsigned long long)start,(unsigned long long)end);
return retval;
}
as = kmalloc(sizeof(*as), GFP_KERNEL);
if (!as)
return retval;
INIT_LIST_HEAD(&as->host_list);
INIT_LIST_HEAD(&as->hl_list);
as->op = ops;
as->host = host;
write_lock_irqsave(&addr_space_lock, flags);
list_for_each(entry, &host->addr_space) {
u64 a1sa, a1ea;
u64 a2sa, a2ea;
a1 = list_entry(entry, struct hpsb_address_serve, host_list);
a2 = list_entry(entry->next, struct hpsb_address_serve,
host_list);
a1sa = a1->start & align_mask;
a1ea = (a1->end + alignment -1) & align_mask;
a2sa = a2->start & align_mask;
a2ea = (a2->end + alignment -1) & align_mask;
if ((a2sa - a1ea >= size) && (a2sa - start >= size) &&
(a2sa > start)) {
as->start = max(start, a1ea);
as->end = as->start + size;
list_add(&as->host_list, entry);
list_add_tail(&as->hl_list, &hl->addr_list);
retval = as->start;
break;
}
}
write_unlock_irqrestore(&addr_space_lock, flags);
if (retval == CSR1212_INVALID_ADDR_SPACE)
kfree(as);
return retval;
}
/**
* hpsb_register_addrspace - register a host address space
*
* @start and @end are 48 bit pointers and have to be quadlet aligned.
* @end points to the first address behind the handled addresses. This
* function can be called multiple times for a single hpsb_highlevel @hl to
* implement sparse register sets. The requested region must not overlap any
* previously allocated region, otherwise registering will fail.
*
* It returns true for successful allocation. Address spaces can be
* unregistered with hpsb_unregister_addrspace. All remaining address spaces
* are automatically deallocated together with the hpsb_highlevel @hl.
*/
int hpsb_register_addrspace(struct hpsb_highlevel *hl, struct hpsb_host *host,
struct hpsb_address_ops *ops, u64 start, u64 end)
{
struct hpsb_address_serve *as;
struct list_head *lh;
int retval = 0;
unsigned long flags;
if (((start|end) & 3) || (start >= end) ||
(end > CSR1212_ALL_SPACE_END)) {
HPSB_ERR("%s called with invalid addresses", __func__);
return 0;
}
as = kmalloc(sizeof(*as), GFP_ATOMIC);
if (!as)
return 0;
INIT_LIST_HEAD(&as->host_list);
INIT_LIST_HEAD(&as->hl_list);
as->op = ops;
as->start = start;
as->end = end;
as->host = host;
write_lock_irqsave(&addr_space_lock, flags);
list_for_each(lh, &host->addr_space) {
struct hpsb_address_serve *as_this =
list_entry(lh, struct hpsb_address_serve, host_list);
struct hpsb_address_serve *as_next =
list_entry(lh->next, struct hpsb_address_serve,
host_list);
if (as_this->end > as->start)
break;
if (as_next->start >= as->end) {
list_add(&as->host_list, lh);
list_add_tail(&as->hl_list, &hl->addr_list);
retval = 1;
break;
}
}
write_unlock_irqrestore(&addr_space_lock, flags);
if (retval == 0)
kfree(as);
return retval;
}
int hpsb_unregister_addrspace(struct hpsb_highlevel *hl, struct hpsb_host *host,
u64 start)
{
int retval = 0;
struct hpsb_address_serve *as;
struct list_head *lh, *next;
unsigned long flags;
write_lock_irqsave(&addr_space_lock, flags);
list_for_each_safe (lh, next, &hl->addr_list) {
as = list_entry(lh, struct hpsb_address_serve, hl_list);
if (as->start == start && as->host == host) {
__delete_addr(as);
retval = 1;
break;
}
}
write_unlock_irqrestore(&addr_space_lock, flags);
return retval;
}
static void init_hpsb_highlevel(struct hpsb_host *host)
{
INIT_LIST_HEAD(&dummy_zero_addr.host_list);
INIT_LIST_HEAD(&dummy_zero_addr.hl_list);
INIT_LIST_HEAD(&dummy_max_addr.host_list);
INIT_LIST_HEAD(&dummy_max_addr.hl_list);
dummy_zero_addr.op = dummy_max_addr.op = &dummy_ops;
dummy_zero_addr.start = dummy_zero_addr.end = 0;
dummy_max_addr.start = dummy_max_addr.end = ((u64) 1) << 48;
list_add_tail(&dummy_zero_addr.host_list, &host->addr_space);
list_add_tail(&dummy_max_addr.host_list, &host->addr_space);
}
void highlevel_add_host(struct hpsb_host *host)
{
struct hpsb_highlevel *hl;
init_hpsb_highlevel(host);
down_read(&hl_drivers_sem);
list_for_each_entry(hl, &hl_drivers, hl_list) {
if (hl->add_host)
hl->add_host(host);
}
up_read(&hl_drivers_sem);
if (host->update_config_rom && hpsb_update_config_rom_image(host) < 0)
HPSB_ERR("Failed to generate Configuration ROM image for host "
"%s-%d", hl->name, host->id);
}
void highlevel_remove_host(struct hpsb_host *host)
{
struct hpsb_highlevel *hl;
down_read(&hl_drivers_sem);
list_for_each_entry(hl, &hl_drivers, hl_list)
__unregister_host(hl, host, 0);
up_read(&hl_drivers_sem);
}
void highlevel_host_reset(struct hpsb_host *host)
{
unsigned long flags;
struct hpsb_highlevel *hl;
read_lock_irqsave(&hl_irqs_lock, flags);
list_for_each_entry(hl, &hl_irqs, irq_list) {
if (hl->host_reset)
hl->host_reset(host);
}
read_unlock_irqrestore(&hl_irqs_lock, flags);
}
void highlevel_fcp_request(struct hpsb_host *host, int nodeid, int direction,
void *data, size_t length)
{
unsigned long flags;
struct hpsb_highlevel *hl;
int cts = ((quadlet_t *)data)[0] >> 4;
read_lock_irqsave(&hl_irqs_lock, flags);
list_for_each_entry(hl, &hl_irqs, irq_list) {
if (hl->fcp_request)
hl->fcp_request(host, nodeid, direction, cts, data,
length);
}
read_unlock_irqrestore(&hl_irqs_lock, flags);
}
/*
* highlevel_read, highlevel_write, highlevel_lock, highlevel_lock64:
*
* These functions are called to handle transactions. They are called when a
* packet arrives. The flags argument contains the second word of the first
* header quadlet of the incoming packet (containing transaction label, retry
* code, transaction code and priority). These functions either return a
* response code or a negative number. In the first case a response will be
* generated. In the latter case, no response will be sent and the driver which
* handled the request will send the response itself.
*/
int highlevel_read(struct hpsb_host *host, int nodeid, void *data, u64 addr,
unsigned int length, u16 flags)
{
struct hpsb_address_serve *as;
unsigned int partlength;
int rcode = RCODE_ADDRESS_ERROR;
read_lock(&addr_space_lock);
list_for_each_entry(as, &host->addr_space, host_list) {
if (as->start > addr)
break;
if (as->end > addr) {
partlength = min(as->end - addr, (u64) length);
if (as->op->read)
rcode = as->op->read(host, nodeid, data,
addr, partlength, flags);
else
rcode = RCODE_TYPE_ERROR;
data += partlength;
length -= partlength;
addr += partlength;
if ((rcode != RCODE_COMPLETE) || !length)
break;
}
}
read_unlock(&addr_space_lock);
if (length && (rcode == RCODE_COMPLETE))
rcode = RCODE_ADDRESS_ERROR;
return rcode;
}
int highlevel_write(struct hpsb_host *host, int nodeid, int destid, void *data,
u64 addr, unsigned int length, u16 flags)
{
struct hpsb_address_serve *as;
unsigned int partlength;
int rcode = RCODE_ADDRESS_ERROR;
read_lock(&addr_space_lock);
list_for_each_entry(as, &host->addr_space, host_list) {
if (as->start > addr)
break;
if (as->end > addr) {
partlength = min(as->end - addr, (u64) length);
if (as->op->write)
rcode = as->op->write(host, nodeid, destid,
data, addr, partlength,
flags);
else
rcode = RCODE_TYPE_ERROR;
data += partlength;
length -= partlength;
addr += partlength;
if ((rcode != RCODE_COMPLETE) || !length)
break;
}
}
read_unlock(&addr_space_lock);
if (length && (rcode == RCODE_COMPLETE))
rcode = RCODE_ADDRESS_ERROR;
return rcode;
}
int highlevel_lock(struct hpsb_host *host, int nodeid, quadlet_t *store,
u64 addr, quadlet_t data, quadlet_t arg, int ext_tcode,
u16 flags)
{
struct hpsb_address_serve *as;
int rcode = RCODE_ADDRESS_ERROR;
read_lock(&addr_space_lock);
list_for_each_entry(as, &host->addr_space, host_list) {
if (as->start > addr)
break;
if (as->end > addr) {
if (as->op->lock)
rcode = as->op->lock(host, nodeid, store, addr,
data, arg, ext_tcode,
flags);
else
rcode = RCODE_TYPE_ERROR;
break;
}
}
read_unlock(&addr_space_lock);
return rcode;
}
int highlevel_lock64(struct hpsb_host *host, int nodeid, octlet_t *store,
u64 addr, octlet_t data, octlet_t arg, int ext_tcode,
u16 flags)
{
struct hpsb_address_serve *as;
int rcode = RCODE_ADDRESS_ERROR;
read_lock(&addr_space_lock);
list_for_each_entry(as, &host->addr_space, host_list) {
if (as->start > addr)
break;
if (as->end > addr) {
if (as->op->lock64)
rcode = as->op->lock64(host, nodeid, store,
addr, data, arg,
ext_tcode, flags);
else
rcode = RCODE_TYPE_ERROR;
break;
}
}
read_unlock(&addr_space_lock);
return rcode;
}