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-rw-r--r--include/asm-s390/idals.h256
1 files changed, 0 insertions, 256 deletions
diff --git a/include/asm-s390/idals.h b/include/asm-s390/idals.h
deleted file mode 100644
index e82c10efe65a..000000000000
--- a/include/asm-s390/idals.h
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1/*
2 * File...........: linux/include/asm-s390x/idals.h
3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4 * Martin Schwidefsky <schwidefsky@de.ibm.com>
5 * Bugreports.to..: <Linux390@de.ibm.com>
6 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 2000a
7
8 * History of changes
9 * 07/24/00 new file
10 * 05/04/02 code restructuring.
11 */
12
13#ifndef _S390_IDALS_H
14#define _S390_IDALS_H
15
16#include <linux/errno.h>
17#include <linux/err.h>
18#include <linux/types.h>
19#include <linux/slab.h>
20#include <asm/cio.h>
21#include <asm/uaccess.h>
22
23#ifdef __s390x__
24#define IDA_SIZE_LOG 12 /* 11 for 2k , 12 for 4k */
25#else
26#define IDA_SIZE_LOG 11 /* 11 for 2k , 12 for 4k */
27#endif
28#define IDA_BLOCK_SIZE (1L<<IDA_SIZE_LOG)
29
30/*
31 * Test if an address/length pair needs an idal list.
32 */
33static inline int
34idal_is_needed(void *vaddr, unsigned int length)
35{
36#ifdef __s390x__
37 return ((__pa(vaddr) + length - 1) >> 31) != 0;
38#else
39 return 0;
40#endif
41}
42
43
44/*
45 * Return the number of idal words needed for an address/length pair.
46 */
47static inline unsigned int
48idal_nr_words(void *vaddr, unsigned int length)
49{
50#ifdef __s390x__
51 if (idal_is_needed(vaddr, length))
52 return ((__pa(vaddr) & (IDA_BLOCK_SIZE-1)) + length +
53 (IDA_BLOCK_SIZE-1)) >> IDA_SIZE_LOG;
54#endif
55 return 0;
56}
57
58/*
59 * Create the list of idal words for an address/length pair.
60 */
61static inline unsigned long *
62idal_create_words(unsigned long *idaws, void *vaddr, unsigned int length)
63{
64#ifdef __s390x__
65 unsigned long paddr;
66 unsigned int cidaw;
67
68 paddr = __pa(vaddr);
69 cidaw = ((paddr & (IDA_BLOCK_SIZE-1)) + length +
70 (IDA_BLOCK_SIZE-1)) >> IDA_SIZE_LOG;
71 *idaws++ = paddr;
72 paddr &= -IDA_BLOCK_SIZE;
73 while (--cidaw > 0) {
74 paddr += IDA_BLOCK_SIZE;
75 *idaws++ = paddr;
76 }
77#endif
78 return idaws;
79}
80
81/*
82 * Sets the address of the data in CCW.
83 * If necessary it allocates an IDAL and sets the appropriate flags.
84 */
85static inline int
86set_normalized_cda(struct ccw1 * ccw, void *vaddr)
87{
88#ifdef __s390x__
89 unsigned int nridaws;
90 unsigned long *idal;
91
92 if (ccw->flags & CCW_FLAG_IDA)
93 return -EINVAL;
94 nridaws = idal_nr_words(vaddr, ccw->count);
95 if (nridaws > 0) {
96 idal = kmalloc(nridaws * sizeof(unsigned long),
97 GFP_ATOMIC | GFP_DMA );
98 if (idal == NULL)
99 return -ENOMEM;
100 idal_create_words(idal, vaddr, ccw->count);
101 ccw->flags |= CCW_FLAG_IDA;
102 vaddr = idal;
103 }
104#endif
105 ccw->cda = (__u32)(unsigned long) vaddr;
106 return 0;
107}
108
109/*
110 * Releases any allocated IDAL related to the CCW.
111 */
112static inline void
113clear_normalized_cda(struct ccw1 * ccw)
114{
115#ifdef __s390x__
116 if (ccw->flags & CCW_FLAG_IDA) {
117 kfree((void *)(unsigned long) ccw->cda);
118 ccw->flags &= ~CCW_FLAG_IDA;
119 }
120#endif
121 ccw->cda = 0;
122}
123
124/*
125 * Idal buffer extension
126 */
127struct idal_buffer {
128 size_t size;
129 size_t page_order;
130 void *data[0];
131};
132
133/*
134 * Allocate an idal buffer
135 */
136static inline struct idal_buffer *
137idal_buffer_alloc(size_t size, int page_order)
138{
139 struct idal_buffer *ib;
140 int nr_chunks, nr_ptrs, i;
141
142 nr_ptrs = (size + IDA_BLOCK_SIZE - 1) >> IDA_SIZE_LOG;
143 nr_chunks = (4096 << page_order) >> IDA_SIZE_LOG;
144 ib = kmalloc(sizeof(struct idal_buffer) + nr_ptrs*sizeof(void *),
145 GFP_DMA | GFP_KERNEL);
146 if (ib == NULL)
147 return ERR_PTR(-ENOMEM);
148 ib->size = size;
149 ib->page_order = page_order;
150 for (i = 0; i < nr_ptrs; i++) {
151 if ((i & (nr_chunks - 1)) != 0) {
152 ib->data[i] = ib->data[i-1] + IDA_BLOCK_SIZE;
153 continue;
154 }
155 ib->data[i] = (void *)
156 __get_free_pages(GFP_KERNEL, page_order);
157 if (ib->data[i] != NULL)
158 continue;
159 // Not enough memory
160 while (i >= nr_chunks) {
161 i -= nr_chunks;
162 free_pages((unsigned long) ib->data[i],
163 ib->page_order);
164 }
165 kfree(ib);
166 return ERR_PTR(-ENOMEM);
167 }
168 return ib;
169}
170
171/*
172 * Free an idal buffer.
173 */
174static inline void
175idal_buffer_free(struct idal_buffer *ib)
176{
177 int nr_chunks, nr_ptrs, i;
178
179 nr_ptrs = (ib->size + IDA_BLOCK_SIZE - 1) >> IDA_SIZE_LOG;
180 nr_chunks = (4096 << ib->page_order) >> IDA_SIZE_LOG;
181 for (i = 0; i < nr_ptrs; i += nr_chunks)
182 free_pages((unsigned long) ib->data[i], ib->page_order);
183 kfree(ib);
184}
185
186/*
187 * Test if a idal list is really needed.
188 */
189static inline int
190__idal_buffer_is_needed(struct idal_buffer *ib)
191{
192#ifdef __s390x__
193 return ib->size > (4096ul << ib->page_order) ||
194 idal_is_needed(ib->data[0], ib->size);
195#else
196 return ib->size > (4096ul << ib->page_order);
197#endif
198}
199
200/*
201 * Set channel data address to idal buffer.
202 */
203static inline void
204idal_buffer_set_cda(struct idal_buffer *ib, struct ccw1 *ccw)
205{
206 if (__idal_buffer_is_needed(ib)) {
207 // setup idals;
208 ccw->cda = (u32)(addr_t) ib->data;
209 ccw->flags |= CCW_FLAG_IDA;
210 } else
211 // we do not need idals - use direct addressing
212 ccw->cda = (u32)(addr_t) ib->data[0];
213 ccw->count = ib->size;
214}
215
216/*
217 * Copy count bytes from an idal buffer to user memory
218 */
219static inline size_t
220idal_buffer_to_user(struct idal_buffer *ib, void __user *to, size_t count)
221{
222 size_t left;
223 int i;
224
225 BUG_ON(count > ib->size);
226 for (i = 0; count > IDA_BLOCK_SIZE; i++) {
227 left = copy_to_user(to, ib->data[i], IDA_BLOCK_SIZE);
228 if (left)
229 return left + count - IDA_BLOCK_SIZE;
230 to = (void __user *) to + IDA_BLOCK_SIZE;
231 count -= IDA_BLOCK_SIZE;
232 }
233 return copy_to_user(to, ib->data[i], count);
234}
235
236/*
237 * Copy count bytes from user memory to an idal buffer
238 */
239static inline size_t
240idal_buffer_from_user(struct idal_buffer *ib, const void __user *from, size_t count)
241{
242 size_t left;
243 int i;
244
245 BUG_ON(count > ib->size);
246 for (i = 0; count > IDA_BLOCK_SIZE; i++) {
247 left = copy_from_user(ib->data[i], from, IDA_BLOCK_SIZE);
248 if (left)
249 return left + count - IDA_BLOCK_SIZE;
250 from = (void __user *) from + IDA_BLOCK_SIZE;
251 count -= IDA_BLOCK_SIZE;
252 }
253 return copy_from_user(ib->data[i], from, count);
254}
255
256#endif
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