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Linux/arch/powerpc/platforms/pseries/hvcserver.c

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  1 /*
  2  * hvcserver.c
  3  * Copyright (C) 2004 Ryan S Arnold, IBM Corporation
  4  *
  5  * PPC64 virtual I/O console server support.
  6  *
  7  * This program is free software; you can redistribute it and/or modify
  8  * it under the terms of the GNU General Public License as published by
  9  * the Free Software Foundation; either version 2 of the License, or
 10  * (at your option) any later version.
 11  *
 12  * This program is distributed in the hope that it will be useful,
 13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 15  * GNU General Public License for more details.
 16  *
 17  * You should have received a copy of the GNU General Public License
 18  * along with this program; if not, write to the Free Software
 19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 20  */
 21 
 22 #include <linux/kernel.h>
 23 #include <linux/list.h>
 24 #include <linux/module.h>
 25 #include <linux/slab.h>
 26 #include <linux/string.h>
 27 
 28 #include <asm/hvcall.h>
 29 #include <asm/hvcserver.h>
 30 #include <asm/io.h>
 31 
 32 #define HVCS_ARCH_VERSION "1.0.0"
 33 
 34 MODULE_AUTHOR("Ryan S. Arnold <rsa@us.ibm.com>");
 35 MODULE_DESCRIPTION("IBM hvcs ppc64 API");
 36 MODULE_LICENSE("GPL");
 37 MODULE_VERSION(HVCS_ARCH_VERSION);
 38 
 39 /*
 40  * Convert arch specific return codes into relevant errnos.  The hvcs
 41  * functions aren't performance sensitive, so this conversion isn't an
 42  * issue.
 43  */
 44 static int hvcs_convert(long to_convert)
 45 {
 46         switch (to_convert) {
 47                 case H_SUCCESS:
 48                         return 0;
 49                 case H_PARAMETER:
 50                         return -EINVAL;
 51                 case H_HARDWARE:
 52                         return -EIO;
 53                 case H_BUSY:
 54                 case H_LONG_BUSY_ORDER_1_MSEC:
 55                 case H_LONG_BUSY_ORDER_10_MSEC:
 56                 case H_LONG_BUSY_ORDER_100_MSEC:
 57                 case H_LONG_BUSY_ORDER_1_SEC:
 58                 case H_LONG_BUSY_ORDER_10_SEC:
 59                 case H_LONG_BUSY_ORDER_100_SEC:
 60                         return -EBUSY;
 61                 case H_FUNCTION: /* fall through */
 62                 default:
 63                         return -EPERM;
 64         }
 65 }
 66 
 67 /**
 68  * hvcs_free_partner_info - free pi allocated by hvcs_get_partner_info
 69  * @head: list_head pointer for an allocated list of partner info structs to
 70  *      free.
 71  *
 72  * This function is used to free the partner info list that was returned by
 73  * calling hvcs_get_partner_info().
 74  */
 75 int hvcs_free_partner_info(struct list_head *head)
 76 {
 77         struct hvcs_partner_info *pi;
 78         struct list_head *element;
 79 
 80         if (!head)
 81                 return -EINVAL;
 82 
 83         while (!list_empty(head)) {
 84                 element = head->next;
 85                 pi = list_entry(element, struct hvcs_partner_info, node);
 86                 list_del(element);
 87                 kfree(pi);
 88         }
 89 
 90         return 0;
 91 }
 92 EXPORT_SYMBOL(hvcs_free_partner_info);
 93 
 94 /* Helper function for hvcs_get_partner_info */
 95 static int hvcs_next_partner(uint32_t unit_address,
 96                 unsigned long last_p_partition_ID,
 97                 unsigned long last_p_unit_address, unsigned long *pi_buff)
 98 
 99 {
100         long retval;
101         retval = plpar_hcall_norets(H_VTERM_PARTNER_INFO, unit_address,
102                         last_p_partition_ID,
103                                 last_p_unit_address, virt_to_phys(pi_buff));
104         return hvcs_convert(retval);
105 }
106 
107 /**
108  * hvcs_get_partner_info - Get all of the partner info for a vty-server adapter
109  * @unit_address: The unit_address of the vty-server adapter for which this
110  *      function is fetching partner info.
111  * @head: An initialized list_head pointer to an empty list to use to return the
112  *      list of partner info fetched from the hypervisor to the caller.
113  * @pi_buff: A page sized buffer pre-allocated prior to calling this function
114  *      that is to be used to be used by firmware as an iterator to keep track
115  *      of the partner info retrieval.
116  *
117  * This function returns non-zero on success, or if there is no partner info.
118  *
119  * The pi_buff is pre-allocated prior to calling this function because this
120  * function may be called with a spin_lock held and kmalloc of a page is not
121  * recommended as GFP_ATOMIC.
122  *
123  * The first long of this buffer is used to store a partner unit address.  The
124  * second long is used to store a partner partition ID and starting at
125  * pi_buff[2] is the 79 character Converged Location Code (diff size than the
126  * unsigned longs, hence the casting mumbo jumbo you see later).
127  *
128  * Invocation of this function should always be followed by an invocation of
129  * hvcs_free_partner_info() using a pointer to the SAME list head instance
130  * that was passed as a parameter to this function.
131  */
132 int hvcs_get_partner_info(uint32_t unit_address, struct list_head *head,
133                 unsigned long *pi_buff)
134 {
135         /*
136          * Dealt with as longs because of the hcall interface even though the
137          * values are uint32_t.
138          */
139         unsigned long   last_p_partition_ID;
140         unsigned long   last_p_unit_address;
141         struct hvcs_partner_info *next_partner_info = NULL;
142         int more = 1;
143         int retval;
144 
145         /* invalid parameters */
146         if (!head || !pi_buff)
147                 return -EINVAL;
148 
149         memset(pi_buff, 0x00, PAGE_SIZE);
150         last_p_partition_ID = last_p_unit_address = ~0UL;
151         INIT_LIST_HEAD(head);
152 
153         do {
154                 retval = hvcs_next_partner(unit_address, last_p_partition_ID,
155                                 last_p_unit_address, pi_buff);
156                 if (retval) {
157                         /*
158                          * Don't indicate that we've failed if we have
159                          * any list elements.
160                          */
161                         if (!list_empty(head))
162                                 return 0;
163                         return retval;
164                 }
165 
166                 last_p_partition_ID = be64_to_cpu(pi_buff[0]);
167                 last_p_unit_address = be64_to_cpu(pi_buff[1]);
168 
169                 /* This indicates that there are no further partners */
170                 if (last_p_partition_ID == ~0UL
171                                 && last_p_unit_address == ~0UL)
172                         break;
173 
174                 /* This is a very small struct and will be freed soon in
175                  * hvcs_free_partner_info(). */
176                 next_partner_info = kmalloc(sizeof(struct hvcs_partner_info),
177                                 GFP_ATOMIC);
178 
179                 if (!next_partner_info) {
180                         printk(KERN_WARNING "HVCONSOLE: kmalloc() failed to"
181                                 " allocate partner info struct.\n");
182                         hvcs_free_partner_info(head);
183                         return -ENOMEM;
184                 }
185 
186                 next_partner_info->unit_address
187                         = (unsigned int)last_p_unit_address;
188                 next_partner_info->partition_ID
189                         = (unsigned int)last_p_partition_ID;
190 
191                 /* copy the Null-term char too */
192                 strlcpy(&next_partner_info->location_code[0],
193                         (char *)&pi_buff[2],
194                         sizeof(next_partner_info->location_code));
195 
196                 list_add_tail(&(next_partner_info->node), head);
197                 next_partner_info = NULL;
198 
199         } while (more);
200 
201         return 0;
202 }
203 EXPORT_SYMBOL(hvcs_get_partner_info);
204 
205 /**
206  * hvcs_register_connection - establish a connection between this vty-server and
207  *      a vty.
208  * @unit_address: The unit address of the vty-server adapter that is to be
209  *      establish a connection.
210  * @p_partition_ID: The partition ID of the vty adapter that is to be connected.
211  * @p_unit_address: The unit address of the vty adapter to which the vty-server
212  *      is to be connected.
213  *
214  * If this function is called once and -EINVAL is returned it may
215  * indicate that the partner info needs to be refreshed for the
216  * target unit address at which point the caller must invoke
217  * hvcs_get_partner_info() and then call this function again.  If,
218  * for a second time, -EINVAL is returned then it indicates that
219  * there is probably already a partner connection registered to a
220  * different vty-server adapter.  It is also possible that a second
221  * -EINVAL may indicate that one of the parms is not valid, for
222  * instance if the link was removed between the vty-server adapter
223  * and the vty adapter that you are trying to open.  Don't shoot the
224  * messenger.  Firmware implemented it this way.
225  */
226 int hvcs_register_connection( uint32_t unit_address,
227                 uint32_t p_partition_ID, uint32_t p_unit_address)
228 {
229         long retval;
230         retval = plpar_hcall_norets(H_REGISTER_VTERM, unit_address,
231                                 p_partition_ID, p_unit_address);
232         return hvcs_convert(retval);
233 }
234 EXPORT_SYMBOL(hvcs_register_connection);
235 
236 /**
237  * hvcs_free_connection - free the connection between a vty-server and vty
238  * @unit_address: The unit address of the vty-server that is to have its
239  *      connection severed.
240  *
241  * This function is used to free the partner connection between a vty-server
242  * adapter and a vty adapter.
243  *
244  * If -EBUSY is returned continue to call this function until 0 is returned.
245  */
246 int hvcs_free_connection(uint32_t unit_address)
247 {
248         long retval;
249         retval = plpar_hcall_norets(H_FREE_VTERM, unit_address);
250         return hvcs_convert(retval);
251 }
252 EXPORT_SYMBOL(hvcs_free_connection);
253 

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