/* * hvcserver.c * Copyright (C) 2004 Ryan S Arnold, IBM Corporation * * PPC64 virtual I/O console server support. * * 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. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include #include #include #include #include #include #define HVCS_ARCH_VERSION "1.0.0" MODULE_AUTHOR("Ryan S. Arnold "); MODULE_DESCRIPTION("IBM hvcs ppc64 API"); MODULE_LICENSE("GPL"); MODULE_VERSION(HVCS_ARCH_VERSION); /* * Convert arch specific return codes into relevant errnos. The hvcs * functions aren't performance sensitive, so this conversion isn't an * issue. */ int hvcs_convert(long to_convert) { switch (to_convert) { case H_Success: return 0; case H_Parameter: return -EINVAL; case H_Hardware: return -EIO; case H_Busy: case H_LongBusyOrder1msec: case H_LongBusyOrder10msec: case H_LongBusyOrder100msec: case H_LongBusyOrder1sec: case H_LongBusyOrder10sec: case H_LongBusyOrder100sec: return -EBUSY; case H_Function: /* fall through */ default: return -EPERM; } } int hvcs_free_partner_info(struct list_head *head) { struct hvcs_partner_info *pi; struct list_head *element; if (!head) { return -EINVAL; } while (!list_empty(head)) { element = head->next; pi = list_entry(element, struct hvcs_partner_info, node); list_del(element); kfree(pi); } return 0; } EXPORT_SYMBOL(hvcs_free_partner_info); /* Helper function for hvcs_get_partner_info */ int hvcs_next_partner(unsigned int unit_address, unsigned long last_p_partition_ID, unsigned long last_p_unit_address, unsigned long *pi_buff) { long retval; retval = plpar_hcall_norets(H_VTERM_PARTNER_INFO, unit_address, last_p_partition_ID, last_p_unit_address, virt_to_phys(pi_buff)); return hvcs_convert(retval); } /* * The unit_address parameter is the unit address of the vty-server vdevice * in whose partner information the caller is interested. This function * uses a pointer to a list_head instance in which to store the partner info. * This function returns non-zero on success, or if there is no partner info. * * Invocation of this function should always be followed by an invocation of * hvcs_free_partner_info() using a pointer to the SAME list head instance * that was used to store the partner_info list. */ int hvcs_get_partner_info(unsigned int unit_address, struct list_head *head, unsigned long *pi_buff) { /* * This is a page sized buffer to be passed to hvcall per invocation. * NOTE: the first long returned is unit_address. The second long * returned is the partition ID and starting with pi_buff[2] are * HVCS_CLC_LENGTH characters, which are diff size than the unsigned * long, hence the casting mumbojumbo you see later. */ unsigned long last_p_partition_ID; unsigned long last_p_unit_address; struct hvcs_partner_info *next_partner_info = NULL; int more = 1; int retval; memset(pi_buff, 0x00, PAGE_SIZE); /* invalid parameters */ if (!head) return -EINVAL; last_p_partition_ID = last_p_unit_address = ~0UL; INIT_LIST_HEAD(head); if (!pi_buff) return -ENOMEM; do { retval = hvcs_next_partner(unit_address, last_p_partition_ID, last_p_unit_address, pi_buff); if (retval) { /* * Don't indicate that we've failed if we have * any list elements. */ if (!list_empty(head)) return 0; return retval; } last_p_partition_ID = pi_buff[0]; last_p_unit_address = pi_buff[1]; /* This indicates that there are no further partners */ if (last_p_partition_ID == ~0UL && last_p_unit_address == ~0UL) break; /* This is a very small struct and will be freed soon in * hvcs_free_partner_info(). */ next_partner_info = kmalloc(sizeof(struct hvcs_partner_info), GFP_ATOMIC); if (!next_partner_info) { printk(KERN_WARNING "HVCONSOLE: kmalloc() failed to" " allocate partner info struct.\n"); hvcs_free_partner_info(head); return -ENOMEM; } next_partner_info->unit_address = (unsigned int)last_p_unit_address; next_partner_info->partition_ID = (unsigned int)last_p_partition_ID; /* copy the Null-term char too */ strncpy(&next_partner_info->location_code[0], (char *)&pi_buff[2], strlen((char *)&pi_buff[2]) + 1); list_add_tail(&(next_partner_info->node), head); next_partner_info = NULL; } while (more); return 0; } EXPORT_SYMBOL(hvcs_get_partner_info); /* * If this function is called once and -EINVAL is returned it may * indicate that the partner info needs to be refreshed for the * target unit address at which point the caller must invoke * hvcs_get_partner_info() and then call this function again. If, * for a second time, -EINVAL is returned then it indicates that * there is probably already a partner connection registered to a * different vty-server@ vdevice. It is also possible that a second * -EINVAL may indicate that one of the parms is not valid, for * instance if the link was removed between the vty-server@ vdevice * and the vty@ vdevice that you are trying to open. Don't shoot the * messenger. Firmware implemented it this way. */ int hvcs_register_connection( unsigned int unit_address, unsigned int p_partition_ID, unsigned int p_unit_address) { long retval; retval = plpar_hcall_norets(H_REGISTER_VTERM, unit_address, p_partition_ID, p_unit_address); return hvcs_convert(retval); } EXPORT_SYMBOL(hvcs_register_connection); /* * If -EBUSY is returned continue to call this function * until 0 is returned. */ int hvcs_free_connection(unsigned int unit_address) { long retval; retval = plpar_hcall_norets(H_FREE_VTERM, unit_address); return hvcs_convert(retval); } EXPORT_SYMBOL(hvcs_free_connection);