/* * 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", __FUNCTION__, (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)", __FUNCTION__, (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", __FUNCTION__); 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; }