1 /*
2 * Copyright (c) 2008-2015 Solarflare Communications Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
15 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
16 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
21 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
22 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
23 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
24 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
26 * The views and conclusions contained in the software and documentation are
27 * those of the authors and should not be interpreted as representing official
28 * policies, either expressed or implied, of the FreeBSD Project.
29 */
30
31 #include <sys/ddi.h>
32
33 #include "sfxge.h"
34 #include "efx.h"
35
36 static int
37 sfxge_dma_buffer_unbind_handle(efsys_mem_t *esmp)
38 {
39 int rc;
40
41 esmp->esm_addr = 0;
42 rc = ddi_dma_unbind_handle(esmp->esm_dma_handle);
43 if (rc != DDI_SUCCESS)
44 goto fail1;
45
46 return (0);
47
48 fail1:
49 DTRACE_PROBE1(fail1, int, rc);
50
51 return (rc);
52 }
53
54 static void
55 sfxge_dma_buffer_mem_free(efsys_mem_t *esmp)
56 {
57 esmp->esm_base = NULL;
58 ddi_dma_mem_free(&(esmp->esm_acc_handle));
59 esmp->esm_acc_handle = NULL;
60 }
61
62 static void
63 sfxge_dma_buffer_handle_free(ddi_dma_handle_t *dhandlep)
64 {
65 ddi_dma_free_handle(dhandlep);
66 *dhandlep = NULL;
67 }
68
69 int
70 sfxge_dma_buffer_create(efsys_mem_t *esmp, const sfxge_dma_buffer_attr_t *sdbap)
71 {
72 int err;
73 int rc;
74 size_t unit;
75 ddi_dma_cookie_t dmac;
76 unsigned int ncookies;
77
78 /* Allocate a DMA handle */
79 err = ddi_dma_alloc_handle(sdbap->sdba_dip, sdbap->sdba_dattrp,
80 sdbap->sdba_callback, NULL, &(esmp->esm_dma_handle));
81 switch (err) {
82 case DDI_SUCCESS:
83 break;
84
85 case DDI_DMA_BADATTR:
86 rc = EINVAL;
87 goto fail1;
88
89 case DDI_DMA_NORESOURCES:
90 rc = ENOMEM;
91 goto fail1;
92
93 default:
94 rc = EFAULT;
95 goto fail1;
96 }
97
98 /* Allocate some DMA memory */
99 err = ddi_dma_mem_alloc(esmp->esm_dma_handle, sdbap->sdba_length,
100 sdbap->sdba_devaccp, sdbap->sdba_memflags,
101 sdbap->sdba_callback, NULL,
102 &(esmp->esm_base), &unit, &(esmp->esm_acc_handle));
103 switch (err) {
104 case DDI_SUCCESS:
105 break;
106
107 case DDI_FAILURE:
108 /*FALLTHRU*/
109 default:
110 rc = EFAULT;
111 goto fail2;
112 }
113
114 if (sdbap->sdba_zeroinit)
115 bzero(esmp->esm_base, sdbap->sdba_length);
116
117 /* Bind the DMA memory to the DMA handle */
118 /* We aren't handling partial mappings */
119 ASSERT3U(sdbap->sdba_bindflags & DDI_DMA_PARTIAL, !=, DDI_DMA_PARTIAL);
120 err = ddi_dma_addr_bind_handle(esmp->esm_dma_handle, NULL,
121 esmp->esm_base, sdbap->sdba_length, sdbap->sdba_bindflags,
122 sdbap->sdba_callback, NULL, &dmac, &ncookies);
123 switch (err) {
124 case DDI_DMA_MAPPED:
125 break;
126
127 case DDI_DMA_INUSE:
128 rc = EEXIST;
129 goto fail3;
130
131 case DDI_DMA_NORESOURCES:
132 rc = ENOMEM;
133 goto fail3;
134
135 case DDI_DMA_NOMAPPING:
136 rc = ENOTSUP;
137 goto fail3;
138
139 case DDI_DMA_TOOBIG:
140 rc = EFBIG;
141 goto fail3;
142
143 default:
144 rc = EFAULT;
145 goto fail3;
146 }
147 ASSERT3U(ncookies, >=, 1);
148 ASSERT3U(ncookies, <=, sdbap->sdba_maxcookies);
149
150 esmp->esm_addr = dmac.dmac_laddress;
151 esmp->esm_size = dmac.dmac_size;
152 DTRACE_PROBE1(addr, efsys_dma_addr_t, esmp->esm_addr);
153
154 return (0);
155
156 fail3:
157 DTRACE_PROBE(fail3);
158
159 sfxge_dma_buffer_mem_free(esmp);
160
161 fail2:
162 DTRACE_PROBE(fail2);
163
164 sfxge_dma_buffer_handle_free(&(esmp->esm_dma_handle));
165 esmp->esm_dma_handle = NULL;
166
167 fail1:
168 DTRACE_PROBE1(fail1, int, rc);
169
170 return (-1);
171 }
172
173 void
174 sfxge_dma_buffer_destroy(efsys_mem_t *esmp)
175 {
176 int rc;
177
178 rc = sfxge_dma_buffer_unbind_handle(esmp);
179 if (rc != 0) {
180 cmn_err(CE_WARN, SFXGE_CMN_ERR "DMA Unbind failed rc=%d", rc);
181 }
182 sfxge_dma_buffer_mem_free(esmp);
183 sfxge_dma_buffer_handle_free(&(esmp->esm_dma_handle));
184 }