xref: /illumos-gate/usr/src/uts/sun4/os/dvma.c (revision 7f7322febbcfe774b7270abc3b191c094bfcc517)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 #pragma ident	"%Z%%M%	%I%	%E% SMI"
28 
29 #include <sys/types.h>
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/kmem.h>
33 #include <sys/cpu.h>
34 #include <sys/sunddi.h>
35 #include <sys/ddi_impldefs.h>
36 #include <sys/pte.h>
37 #include <sys/machsystm.h>
38 #include <sys/mmu.h>
39 #include <sys/dvma.h>
40 #include <sys/debug.h>
41 
42 #define	HD	((ddi_dma_impl_t *)h)->dmai_rdip
43 
44 unsigned long
45 dvma_pagesize(dev_info_t *dip)
46 {
47 	auto unsigned long dvmapgsz;
48 
49 	(void) ddi_ctlops(dip, dip, DDI_CTLOPS_DVMAPAGESIZE,
50 	    NULL, (void *) &dvmapgsz);
51 	return (dvmapgsz);
52 }
53 
54 int
55 dvma_reserve(dev_info_t *dip,  ddi_dma_lim_t *limp, uint_t pages,
56     ddi_dma_handle_t *handlep)
57 {
58 	auto ddi_dma_lim_t dma_lim;
59 	auto ddi_dma_impl_t implhdl;
60 	struct ddi_dma_req dmareq;
61 	ddi_dma_handle_t reqhdl;
62 	ddi_dma_impl_t *mp;
63 	int ret;
64 
65 	if (limp == (ddi_dma_lim_t *)0) {
66 		return (DDI_DMA_BADLIMITS);
67 	} else {
68 		dma_lim = *limp;
69 	}
70 	bzero(&dmareq, sizeof (dmareq));
71 	dmareq.dmar_fp = DDI_DMA_DONTWAIT;
72 	dmareq.dmar_flags = DDI_DMA_RDWR | DDI_DMA_STREAMING;
73 	dmareq.dmar_limits = &dma_lim;
74 	dmareq.dmar_object.dmao_size = pages;
75 	/*
76 	 * pass in a dummy handle. This avoids the problem when
77 	 * somebody is dereferencing the handle before checking
78 	 * the operation. This can be avoided once we separate
79 	 * handle allocation and actual operation.
80 	 */
81 	bzero((caddr_t)&implhdl, sizeof (ddi_dma_impl_t));
82 	reqhdl = (ddi_dma_handle_t)&implhdl;
83 
84 	ret = ddi_dma_mctl(dip, dip, reqhdl, DDI_DMA_RESERVE, (off_t *)&dmareq,
85 	    0, (caddr_t *)handlep, 0);
86 
87 	if (ret == DDI_SUCCESS) {
88 		mp = (ddi_dma_impl_t *)(*handlep);
89 		if (!(mp->dmai_rflags & DMP_BYPASSNEXUS)) {
90 			uint_t np = mp->dmai_ndvmapages;
91 
92 			mp->dmai_mapping = (ulong_t)kmem_alloc(
93 				sizeof (ddi_dma_lim_t), KM_SLEEP);
94 			bcopy((char *)&dma_lim, (char *)mp->dmai_mapping,
95 			    sizeof (ddi_dma_lim_t));
96 			mp->dmai_minfo = kmem_alloc(
97 				np * sizeof (ddi_dma_handle_t), KM_SLEEP);
98 		}
99 	}
100 	return (ret);
101 }
102 
103 void
104 dvma_release(ddi_dma_handle_t h)
105 {
106 	ddi_dma_impl_t *mp = (ddi_dma_impl_t *)h;
107 	uint_t np = mp->dmai_ndvmapages;
108 
109 	if (!(mp->dmai_rflags & DMP_BYPASSNEXUS)) {
110 		kmem_free((void *)mp->dmai_mapping, sizeof (ddi_dma_lim_t));
111 		kmem_free(mp->dmai_minfo, np * sizeof (ddi_dma_handle_t));
112 	}
113 	(void) ddi_dma_mctl(HD, HD, h, DDI_DMA_RELEASE, 0, 0, 0, 0);
114 
115 }
116 
117 void
118 dvma_kaddr_load(ddi_dma_handle_t h, caddr_t a, uint_t len, uint_t index,
119 	ddi_dma_cookie_t *cp)
120 {
121 	register ddi_dma_impl_t *mp = (ddi_dma_impl_t *)h;
122 	struct fast_dvma *nexus_private;
123 	struct dvma_ops *nexus_funcptr;
124 	ddi_dma_attr_t dma_attr;
125 	uint_t ccnt;
126 
127 	if (mp->dmai_rflags & DMP_BYPASSNEXUS) {
128 		nexus_private = (struct fast_dvma *)mp->dmai_nexus_private;
129 		nexus_funcptr = (struct dvma_ops *)nexus_private->ops;
130 		(void) (*nexus_funcptr->dvma_kaddr_load)(h, a, len, index, cp);
131 	} else {
132 		ddi_dma_handle_t handle;
133 		ddi_dma_lim_t *limp;
134 
135 		limp = (ddi_dma_lim_t *)mp->dmai_mapping;
136 		dma_attr.dma_attr_version = DMA_ATTR_V0;
137 		dma_attr.dma_attr_addr_lo = limp->dlim_addr_lo;
138 		dma_attr.dma_attr_addr_hi = limp->dlim_addr_hi;
139 		dma_attr.dma_attr_count_max = limp->dlim_cntr_max;
140 		dma_attr.dma_attr_align = 1;
141 		dma_attr.dma_attr_burstsizes = limp->dlim_burstsizes;
142 		dma_attr.dma_attr_minxfer = limp->dlim_minxfer;
143 		dma_attr.dma_attr_maxxfer = 0xFFFFFFFFull;
144 		dma_attr.dma_attr_seg = 0xFFFFFFFFull;
145 		dma_attr.dma_attr_sgllen = 1;
146 		dma_attr.dma_attr_granular = 1;
147 		dma_attr.dma_attr_flags = 0;
148 		(void) ddi_dma_alloc_handle(HD, &dma_attr, DDI_DMA_SLEEP, NULL,
149 		    &handle);
150 		(void) ddi_dma_addr_bind_handle(handle, NULL, a, len,
151 		    DDI_DMA_RDWR, DDI_DMA_SLEEP, NULL, cp, &ccnt);
152 		((ddi_dma_handle_t *)mp->dmai_minfo)[index] = handle;
153 	}
154 }
155 
156 /*ARGSUSED*/
157 void
158 dvma_unload(ddi_dma_handle_t h, uint_t objindex, uint_t type)
159 {
160 	register ddi_dma_impl_t *mp = (ddi_dma_impl_t *)h;
161 	struct fast_dvma *nexus_private;
162 	struct dvma_ops *nexus_funcptr;
163 
164 	if (mp->dmai_rflags & DMP_BYPASSNEXUS) {
165 		nexus_private = (struct fast_dvma *)mp->dmai_nexus_private;
166 		nexus_funcptr = (struct dvma_ops *)nexus_private->ops;
167 		(void) (*nexus_funcptr->dvma_unload)(h, objindex, type);
168 	} else {
169 		ddi_dma_handle_t handle;
170 
171 		handle = ((ddi_dma_handle_t *)mp->dmai_minfo)[objindex];
172 		(void) ddi_dma_unbind_handle(handle);
173 		(void) ddi_dma_free_handle(&handle);
174 	}
175 }
176 
177 void
178 dvma_sync(ddi_dma_handle_t h, uint_t objindex, uint_t type)
179 {
180 	register ddi_dma_impl_t *mp = (ddi_dma_impl_t *)h;
181 	struct fast_dvma *nexus_private;
182 	struct dvma_ops *nexus_funcptr;
183 
184 	if (mp->dmai_rflags & DMP_BYPASSNEXUS) {
185 		nexus_private = (struct fast_dvma *)mp->dmai_nexus_private;
186 		nexus_funcptr = (struct dvma_ops *)nexus_private->ops;
187 		(void) (*nexus_funcptr->dvma_sync)(h, objindex, type);
188 	} else {
189 		ddi_dma_handle_t handle;
190 
191 		handle = ((ddi_dma_handle_t *)mp->dmai_minfo)[objindex];
192 		(void) ddi_dma_sync(handle, 0, 0, type);
193 	}
194 }
195