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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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738 lines
19 KiB
C
738 lines
19 KiB
C
/*
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* IEEE 1394 for Linux
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*
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* Copyright (C) 1999 Andreas E. Bombe
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*
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* This code is licensed under the GPL. See the file COPYING in the root
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* directory of the kernel sources for details.
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*
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*
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* Contributions:
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*
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* Christian Toegel <christian.toegel@gmx.at>
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* unregister address space
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*
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* Manfred Weihs <weihs@ict.tuwien.ac.at>
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* unregister address space
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*
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*/
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#include <linux/slab.h>
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#include <linux/list.h>
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#include <linux/bitops.h>
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#include "ieee1394.h"
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#include "ieee1394_types.h"
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#include "hosts.h"
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#include "ieee1394_core.h"
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#include "highlevel.h"
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#include "nodemgr.h"
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struct hl_host_info {
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struct list_head list;
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struct hpsb_host *host;
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size_t size;
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unsigned long key;
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void *data;
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};
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static LIST_HEAD(hl_drivers);
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static DECLARE_RWSEM(hl_drivers_sem);
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static LIST_HEAD(hl_irqs);
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static DEFINE_RWLOCK(hl_irqs_lock);
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static DEFINE_RWLOCK(addr_space_lock);
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/* addr_space list will have zero and max already included as bounds */
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static struct hpsb_address_ops dummy_ops = { NULL, NULL, NULL, NULL };
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static struct hpsb_address_serve dummy_zero_addr, dummy_max_addr;
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static struct hl_host_info *hl_get_hostinfo(struct hpsb_highlevel *hl,
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struct hpsb_host *host)
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{
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struct hl_host_info *hi = NULL;
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if (!hl || !host)
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return NULL;
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read_lock(&hl->host_info_lock);
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list_for_each_entry(hi, &hl->host_info_list, list) {
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if (hi->host == host) {
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read_unlock(&hl->host_info_lock);
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return hi;
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}
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}
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read_unlock(&hl->host_info_lock);
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return NULL;
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}
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/**
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* hpsb_get_hostinfo - retrieve a hostinfo pointer bound to this driver/host
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*
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* Returns a per @host and @hl driver data structure that was previously stored
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* by hpsb_create_hostinfo.
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*/
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void *hpsb_get_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host)
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{
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struct hl_host_info *hi = hl_get_hostinfo(hl, host);
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return hi ? hi->data : NULL;
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}
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/**
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* hpsb_create_hostinfo - allocate a hostinfo pointer bound to this driver/host
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*
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* Allocate a hostinfo pointer backed by memory with @data_size and bind it to
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* to this @hl driver and @host. If @data_size is zero, then the return here is
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* only valid for error checking.
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*/
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void *hpsb_create_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host,
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size_t data_size)
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{
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struct hl_host_info *hi;
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void *data;
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unsigned long flags;
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hi = hl_get_hostinfo(hl, host);
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if (hi) {
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HPSB_ERR("%s called hpsb_create_hostinfo when hostinfo already"
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" exists", hl->name);
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return NULL;
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}
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hi = kzalloc(sizeof(*hi) + data_size, GFP_ATOMIC);
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if (!hi)
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return NULL;
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if (data_size) {
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data = hi->data = hi + 1;
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hi->size = data_size;
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} else
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data = hi;
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hi->host = host;
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write_lock_irqsave(&hl->host_info_lock, flags);
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list_add_tail(&hi->list, &hl->host_info_list);
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write_unlock_irqrestore(&hl->host_info_lock, flags);
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return data;
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}
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/**
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* hpsb_set_hostinfo - set the hostinfo pointer to something useful
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*
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* Usually follows a call to hpsb_create_hostinfo, where the size is 0.
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*/
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int hpsb_set_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host,
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void *data)
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{
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struct hl_host_info *hi;
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hi = hl_get_hostinfo(hl, host);
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if (hi) {
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if (!hi->size && !hi->data) {
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hi->data = data;
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return 0;
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} else
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HPSB_ERR("%s called hpsb_set_hostinfo when hostinfo "
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"already has data", hl->name);
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} else
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HPSB_ERR("%s called hpsb_set_hostinfo when no hostinfo exists",
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hl->name);
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return -EINVAL;
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}
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/**
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* hpsb_destroy_hostinfo - free and remove a hostinfo pointer
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*
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* Free and remove the hostinfo pointer bound to this @hl driver and @host.
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*/
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void hpsb_destroy_hostinfo(struct hpsb_highlevel *hl, struct hpsb_host *host)
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{
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struct hl_host_info *hi;
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hi = hl_get_hostinfo(hl, host);
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if (hi) {
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unsigned long flags;
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write_lock_irqsave(&hl->host_info_lock, flags);
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list_del(&hi->list);
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write_unlock_irqrestore(&hl->host_info_lock, flags);
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kfree(hi);
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}
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return;
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}
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/**
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* hpsb_set_hostinfo_key - set an alternate lookup key for an hostinfo
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*
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* Sets an alternate lookup key for the hostinfo bound to this @hl driver and
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* @host.
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*/
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void hpsb_set_hostinfo_key(struct hpsb_highlevel *hl, struct hpsb_host *host,
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unsigned long key)
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{
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struct hl_host_info *hi;
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hi = hl_get_hostinfo(hl, host);
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if (hi)
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hi->key = key;
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return;
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}
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/**
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* hpsb_get_hostinfo_bykey - retrieve a hostinfo pointer by its alternate key
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*/
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void *hpsb_get_hostinfo_bykey(struct hpsb_highlevel *hl, unsigned long key)
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{
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struct hl_host_info *hi;
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void *data = NULL;
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if (!hl)
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return NULL;
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read_lock(&hl->host_info_lock);
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list_for_each_entry(hi, &hl->host_info_list, list) {
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if (hi->key == key) {
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data = hi->data;
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break;
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}
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}
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read_unlock(&hl->host_info_lock);
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return data;
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}
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static int highlevel_for_each_host_reg(struct hpsb_host *host, void *__data)
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{
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struct hpsb_highlevel *hl = __data;
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hl->add_host(host);
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if (host->update_config_rom && hpsb_update_config_rom_image(host) < 0)
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HPSB_ERR("Failed to generate Configuration ROM image for host "
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"%s-%d", hl->name, host->id);
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return 0;
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}
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/**
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* hpsb_register_highlevel - register highlevel driver
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*
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* The name pointer in @hl has to stay valid at all times because the string is
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* not copied.
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*/
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void hpsb_register_highlevel(struct hpsb_highlevel *hl)
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{
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unsigned long flags;
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INIT_LIST_HEAD(&hl->addr_list);
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INIT_LIST_HEAD(&hl->host_info_list);
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rwlock_init(&hl->host_info_lock);
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down_write(&hl_drivers_sem);
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list_add_tail(&hl->hl_list, &hl_drivers);
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up_write(&hl_drivers_sem);
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write_lock_irqsave(&hl_irqs_lock, flags);
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list_add_tail(&hl->irq_list, &hl_irqs);
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write_unlock_irqrestore(&hl_irqs_lock, flags);
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if (hl->add_host)
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nodemgr_for_each_host(hl, highlevel_for_each_host_reg);
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return;
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}
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static void __delete_addr(struct hpsb_address_serve *as)
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{
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list_del(&as->host_list);
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list_del(&as->hl_list);
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kfree(as);
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}
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static void __unregister_host(struct hpsb_highlevel *hl, struct hpsb_host *host,
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int update_cr)
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{
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unsigned long flags;
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struct list_head *lh, *next;
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struct hpsb_address_serve *as;
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/* First, let the highlevel driver unreg */
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if (hl->remove_host)
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hl->remove_host(host);
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/* Remove any addresses that are matched for this highlevel driver
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* and this particular host. */
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write_lock_irqsave(&addr_space_lock, flags);
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list_for_each_safe (lh, next, &hl->addr_list) {
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as = list_entry(lh, struct hpsb_address_serve, hl_list);
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if (as->host == host)
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__delete_addr(as);
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}
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write_unlock_irqrestore(&addr_space_lock, flags);
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/* Now update the config-rom to reflect anything removed by the
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* highlevel driver. */
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if (update_cr && host->update_config_rom &&
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hpsb_update_config_rom_image(host) < 0)
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HPSB_ERR("Failed to generate Configuration ROM image for host "
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"%s-%d", hl->name, host->id);
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/* Finally remove all the host info associated between these two. */
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hpsb_destroy_hostinfo(hl, host);
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}
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static int highlevel_for_each_host_unreg(struct hpsb_host *host, void *__data)
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{
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struct hpsb_highlevel *hl = __data;
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__unregister_host(hl, host, 1);
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return 0;
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}
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/**
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* hpsb_unregister_highlevel - unregister highlevel driver
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*/
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void hpsb_unregister_highlevel(struct hpsb_highlevel *hl)
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{
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unsigned long flags;
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write_lock_irqsave(&hl_irqs_lock, flags);
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list_del(&hl->irq_list);
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write_unlock_irqrestore(&hl_irqs_lock, flags);
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down_write(&hl_drivers_sem);
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list_del(&hl->hl_list);
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up_write(&hl_drivers_sem);
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nodemgr_for_each_host(hl, highlevel_for_each_host_unreg);
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}
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/**
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* hpsb_allocate_and_register_addrspace - alloc' and reg' a host address space
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*
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* @start and @end are 48 bit pointers and have to be quadlet aligned.
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* @end points to the first address behind the handled addresses. This
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* function can be called multiple times for a single hpsb_highlevel @hl to
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* implement sparse register sets. The requested region must not overlap any
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* previously allocated region, otherwise registering will fail.
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*
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* It returns true for successful allocation. Address spaces can be
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* unregistered with hpsb_unregister_addrspace. All remaining address spaces
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* are automatically deallocated together with the hpsb_highlevel @hl.
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*/
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u64 hpsb_allocate_and_register_addrspace(struct hpsb_highlevel *hl,
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struct hpsb_host *host,
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struct hpsb_address_ops *ops,
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u64 size, u64 alignment,
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u64 start, u64 end)
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{
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struct hpsb_address_serve *as, *a1, *a2;
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struct list_head *entry;
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u64 retval = CSR1212_INVALID_ADDR_SPACE;
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unsigned long flags;
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u64 align_mask = ~(alignment - 1);
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if ((alignment & 3) || (alignment > 0x800000000000ULL) ||
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(hweight64(alignment) != 1)) {
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HPSB_ERR("%s called with invalid alignment: 0x%048llx",
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__FUNCTION__, (unsigned long long)alignment);
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return retval;
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}
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/* default range,
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* avoids controller's posted write area (see OHCI 1.1 clause 1.5) */
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if (start == CSR1212_INVALID_ADDR_SPACE &&
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end == CSR1212_INVALID_ADDR_SPACE) {
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start = host->middle_addr_space;
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end = CSR1212_ALL_SPACE_END;
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}
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if (((start|end) & ~align_mask) || (start >= end) ||
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(end > CSR1212_ALL_SPACE_END)) {
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HPSB_ERR("%s called with invalid addresses "
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"(start = %012Lx end = %012Lx)", __FUNCTION__,
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(unsigned long long)start,(unsigned long long)end);
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return retval;
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}
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as = kmalloc(sizeof(*as), GFP_KERNEL);
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if (!as)
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return retval;
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INIT_LIST_HEAD(&as->host_list);
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INIT_LIST_HEAD(&as->hl_list);
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as->op = ops;
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as->host = host;
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write_lock_irqsave(&addr_space_lock, flags);
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list_for_each(entry, &host->addr_space) {
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u64 a1sa, a1ea;
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u64 a2sa, a2ea;
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a1 = list_entry(entry, struct hpsb_address_serve, host_list);
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a2 = list_entry(entry->next, struct hpsb_address_serve,
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host_list);
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a1sa = a1->start & align_mask;
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a1ea = (a1->end + alignment -1) & align_mask;
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a2sa = a2->start & align_mask;
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a2ea = (a2->end + alignment -1) & align_mask;
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if ((a2sa - a1ea >= size) && (a2sa - start >= size) &&
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(a2sa > start)) {
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as->start = max(start, a1ea);
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as->end = as->start + size;
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list_add(&as->host_list, entry);
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list_add_tail(&as->hl_list, &hl->addr_list);
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retval = as->start;
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break;
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}
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}
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write_unlock_irqrestore(&addr_space_lock, flags);
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if (retval == CSR1212_INVALID_ADDR_SPACE)
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kfree(as);
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return retval;
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}
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/**
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* hpsb_register_addrspace - register a host address space
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*
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* @start and @end are 48 bit pointers and have to be quadlet aligned.
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* @end points to the first address behind the handled addresses. This
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* function can be called multiple times for a single hpsb_highlevel @hl to
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* implement sparse register sets. The requested region must not overlap any
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* previously allocated region, otherwise registering will fail.
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*
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* It returns true for successful allocation. Address spaces can be
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* unregistered with hpsb_unregister_addrspace. All remaining address spaces
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* are automatically deallocated together with the hpsb_highlevel @hl.
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*/
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int hpsb_register_addrspace(struct hpsb_highlevel *hl, struct hpsb_host *host,
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struct hpsb_address_ops *ops, u64 start, u64 end)
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{
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struct hpsb_address_serve *as;
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struct list_head *lh;
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int retval = 0;
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unsigned long flags;
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if (((start|end) & 3) || (start >= end) ||
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(end > CSR1212_ALL_SPACE_END)) {
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HPSB_ERR("%s called with invalid addresses", __FUNCTION__);
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return 0;
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}
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as = kmalloc(sizeof(*as), GFP_ATOMIC);
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if (!as)
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return 0;
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INIT_LIST_HEAD(&as->host_list);
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INIT_LIST_HEAD(&as->hl_list);
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as->op = ops;
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as->start = start;
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as->end = end;
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as->host = host;
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write_lock_irqsave(&addr_space_lock, flags);
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list_for_each(lh, &host->addr_space) {
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struct hpsb_address_serve *as_this =
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list_entry(lh, struct hpsb_address_serve, host_list);
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struct hpsb_address_serve *as_next =
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list_entry(lh->next, struct hpsb_address_serve,
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host_list);
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if (as_this->end > as->start)
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break;
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if (as_next->start >= as->end) {
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list_add(&as->host_list, lh);
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list_add_tail(&as->hl_list, &hl->addr_list);
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retval = 1;
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break;
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}
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}
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write_unlock_irqrestore(&addr_space_lock, flags);
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if (retval == 0)
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kfree(as);
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return retval;
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}
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int hpsb_unregister_addrspace(struct hpsb_highlevel *hl, struct hpsb_host *host,
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u64 start)
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{
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int retval = 0;
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struct hpsb_address_serve *as;
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struct list_head *lh, *next;
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unsigned long flags;
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write_lock_irqsave(&addr_space_lock, flags);
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list_for_each_safe (lh, next, &hl->addr_list) {
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as = list_entry(lh, struct hpsb_address_serve, hl_list);
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if (as->start == start && as->host == host) {
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__delete_addr(as);
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retval = 1;
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break;
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}
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}
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write_unlock_irqrestore(&addr_space_lock, flags);
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return retval;
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}
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|
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/**
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* hpsb_listen_channel - enable receving a certain isochronous channel
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*
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* Reception is handled through the @hl's iso_receive op.
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*/
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int hpsb_listen_channel(struct hpsb_highlevel *hl, struct hpsb_host *host,
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unsigned int channel)
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{
|
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if (channel > 63) {
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HPSB_ERR("%s called with invalid channel", __FUNCTION__);
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return -EINVAL;
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}
|
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if (host->iso_listen_count[channel]++ == 0)
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return host->driver->devctl(host, ISO_LISTEN_CHANNEL, channel);
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return 0;
|
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}
|
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|
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/**
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* hpsb_unlisten_channel - disable receving a certain isochronous channel
|
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*/
|
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void hpsb_unlisten_channel(struct hpsb_highlevel *hl, struct hpsb_host *host,
|
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unsigned int channel)
|
|
{
|
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if (channel > 63) {
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HPSB_ERR("%s called with invalid channel", __FUNCTION__);
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return;
|
|
}
|
|
if (--host->iso_listen_count[channel] == 0)
|
|
host->driver->devctl(host, ISO_UNLISTEN_CHANNEL, channel);
|
|
}
|
|
|
|
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_iso_receive(struct hpsb_host *host, void *data, size_t length)
|
|
{
|
|
unsigned long flags;
|
|
struct hpsb_highlevel *hl;
|
|
int channel = (((quadlet_t *)data)[0] >> 8) & 0x3f;
|
|
|
|
read_lock_irqsave(&hl_irqs_lock, flags);
|
|
list_for_each_entry(hl, &hl_irqs, irq_list) {
|
|
if (hl->iso_receive)
|
|
hl->iso_receive(host, channel, data, length);
|
|
}
|
|
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;
|
|
}
|