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1da177e4 LT |
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> | |
4e57b681 | 25 | #include <linux/slab.h> |
6b6680c4 | 26 | #include <linux/string.h> |
4e57b681 | 27 | |
1da177e4 LT |
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 | */ | |
8446196a | 44 | static int hvcs_convert(long to_convert) |
1da177e4 LT |
45 | { |
46 | switch (to_convert) { | |
706c8c93 | 47 | case H_SUCCESS: |
1da177e4 | 48 | return 0; |
706c8c93 | 49 | case H_PARAMETER: |
1da177e4 | 50 | return -EINVAL; |
706c8c93 | 51 | case H_HARDWARE: |
1da177e4 | 52 | return -EIO; |
706c8c93 SB |
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: | |
1da177e4 | 60 | return -EBUSY; |
706c8c93 | 61 | case H_FUNCTION: /* fall through */ |
1da177e4 LT |
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 */ | |
8446196a | 95 | static int hvcs_next_partner(uint32_t unit_address, |
1da177e4 LT |
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 | memset(pi_buff, 0x00, PAGE_SIZE); | |
146 | /* invalid parameters */ | |
147 | if (!head || !pi_buff) | |
148 | return -EINVAL; | |
149 | ||
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 = pi_buff[0]; | |
167 | last_p_unit_address = 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 */ | |
6b6680c4 | 192 | strlcpy(&next_partner_info->location_code[0], |
1da177e4 | 193 | (char *)&pi_buff[2], |
6b6680c4 | 194 | sizeof(next_partner_info->location_code)); |
1da177e4 LT |
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); |