2 * Copyright (c) 2009 Robert C. Noland III <rnoland@FreeBSD.org>
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice (including the next
13 * paragraph) shall be included in all copies or substantial portions of the
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 * DEALINGS IN THE SOFTWARE.
24 * $FreeBSD: src/sys/dev/drm2/drm_scatter.c,v 1.1 2012/05/22 11:07:44 kib Exp $
27 /** @file drm_scatter.c
28 * Allocation of memory for scatter-gather mappings by the graphics chip.
29 * The memory allocated here is then made into an aperture in the card
30 * by mapping the pages into the GART.
34 #include "drm_legacy.h"
36 #include <vm/vm_kern.h>
38 static void drm_sg_cleanup(struct drm_sg_mem
* entry
)
43 if (entry
->vaddr
!= 0)
44 kmem_free(kernel_map
, entry
->vaddr
, IDX_TO_OFF(entry
->pages
));
46 kfree(entry
->busaddr
);
50 void drm_legacy_sg_cleanup(struct drm_device
*dev
)
52 if (drm_core_check_feature(dev
, DRIVER_SG
) && dev
->sg
&&
53 drm_core_check_feature(dev
, DRIVER_LEGACY
)) {
54 drm_sg_cleanup(dev
->sg
);
59 int drm_legacy_sg_alloc(struct drm_device
*dev
, void *data
,
60 struct drm_file
*file_priv
)
62 struct drm_scatter_gather
*request
= data
;
63 struct drm_sg_mem
*entry
;
69 if (!drm_core_check_feature(dev
, DRIVER_LEGACY
))
75 DRM_DEBUG("request size=%ld\n", request
->size
);
77 entry
= kmalloc(sizeof(*entry
), M_DRM
, M_WAITOK
| M_ZERO
);
79 size
= round_page(request
->size
);
80 entry
->pages
= OFF_TO_IDX(size
);
81 entry
->busaddr
= kmalloc(entry
->pages
* sizeof(*entry
->busaddr
),
82 M_DRM
, M_WAITOK
| M_ZERO
);
84 entry
->vaddr
= kmem_alloc_attr(kernel_map
, size
,
85 VM_SUBSYS_DRM_SCAT
, M_WAITOK
| M_ZERO
,
86 0, BUS_SPACE_MAXADDR_32BIT
,
87 VM_MEMATTR_WRITE_COMBINING
);
88 if (entry
->vaddr
== 0) {
89 drm_sg_cleanup(entry
);
93 for(pindex
= 0; pindex
< entry
->pages
; pindex
++) {
94 entry
->busaddr
[pindex
] =
95 vtophys(entry
->vaddr
+ IDX_TO_OFF(pindex
));
101 drm_sg_cleanup(entry
);
107 request
->handle
= entry
->vaddr
;
109 DRM_DEBUG("allocated %ju pages @ 0x%08jx, contents=%08lx\n",
110 entry
->pages
, (uintmax_t)entry
->vaddr
,
111 *(unsigned long *)entry
->vaddr
);
116 int drm_legacy_sg_free(struct drm_device
*dev
, void *data
,
117 struct drm_file
*file_priv
)
119 struct drm_scatter_gather
*request
= data
;
120 struct drm_sg_mem
*entry
;
122 if (!drm_core_check_feature(dev
, DRIVER_LEGACY
))
125 if (!drm_core_check_feature(dev
, DRIVER_SG
))
131 if (!entry
|| entry
->vaddr
!= request
->handle
)
134 DRM_DEBUG("free 0x%jx\n", (uintmax_t)entry
->vaddr
);
136 drm_sg_cleanup(entry
);