1235783Skib/*-
2235783Skib * Copyright (c) 2009 Robert C. Noland III <rnoland@FreeBSD.org>
3235783Skib * All Rights Reserved.
4235783Skib *
5235783Skib * Permission is hereby granted, free of charge, to any person obtaining a
6235783Skib * copy of this software and associated documentation files (the "Software"),
7235783Skib * to deal in the Software without restriction, including without limitation
8235783Skib * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9235783Skib * and/or sell copies of the Software, and to permit persons to whom the
10235783Skib * Software is furnished to do so, subject to the following conditions:
11235783Skib *
12235783Skib * The above copyright notice and this permission notice (including the next
13235783Skib * paragraph) shall be included in all copies or substantial portions of the
14235783Skib * Software.
15235783Skib *
16235783Skib * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17235783Skib * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18235783Skib * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
19235783Skib * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
20235783Skib * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21235783Skib * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22235783Skib * DEALINGS IN THE SOFTWARE.
23235783Skib */
24235783Skib
25235783Skib#include <sys/cdefs.h>
26235783Skib__FBSDID("$FreeBSD$");
27235783Skib
28235783Skib/** @file drm_scatter.c
29235783Skib * Allocation of memory for scatter-gather mappings by the graphics chip.
30235783Skib * The memory allocated here is then made into an aperture in the card
31235783Skib * by mapping the pages into the GART.
32235783Skib */
33235783Skib
34235783Skib#include <dev/drm2/drmP.h>
35235783Skib
36282199Sdumbbell#define DEBUG_SCATTER 0
37282199Sdumbbell
38282199Sdumbbellstatic inline vm_offset_t drm_vmalloc_dma(vm_size_t size)
39235783Skib{
40282199Sdumbbell	return kmem_alloc_attr(kernel_arena, size, M_NOWAIT | M_ZERO,
41282199Sdumbbell	    0, BUS_SPACE_MAXADDR_32BIT, VM_MEMATTR_WRITE_COMBINING);
42282199Sdumbbell}
43282199Sdumbbell
44282199Sdumbbellvoid drm_sg_cleanup(struct drm_sg_mem * entry)
45282199Sdumbbell{
46282199Sdumbbell	if (entry == NULL)
47282199Sdumbbell		return;
48282199Sdumbbell
49282199Sdumbbell	if (entry->vaddr != 0)
50282199Sdumbbell		kmem_free(kernel_arena, entry->vaddr, IDX_TO_OFF(entry->pages));
51282199Sdumbbell
52282199Sdumbbell	free(entry->busaddr, DRM_MEM_SGLISTS);
53282199Sdumbbell	free(entry, DRM_MEM_DRIVER);
54282199Sdumbbell}
55282199Sdumbbell
56282199Sdumbbellint drm_sg_alloc(struct drm_device *dev, struct drm_scatter_gather * request)
57282199Sdumbbell{
58235783Skib	struct drm_sg_mem *entry;
59235783Skib	vm_size_t size;
60235783Skib	vm_pindex_t pindex;
61235783Skib
62282199Sdumbbell	DRM_DEBUG("\n");
63282199Sdumbbell
64282199Sdumbbell	if (!drm_core_check_feature(dev, DRIVER_SG))
65282199Sdumbbell		return -EINVAL;
66282199Sdumbbell
67235783Skib	if (dev->sg)
68282199Sdumbbell		return -EINVAL;
69235783Skib
70282199Sdumbbell	entry = malloc(sizeof(*entry), DRM_MEM_DRIVER, M_NOWAIT | M_ZERO);
71282199Sdumbbell	if (!entry)
72282199Sdumbbell		return -ENOMEM;
73282199Sdumbbell
74235783Skib	DRM_DEBUG("request size=%ld\n", request->size);
75235783Skib
76235783Skib	size = round_page(request->size);
77235783Skib	entry->pages = OFF_TO_IDX(size);
78235783Skib	entry->busaddr = malloc(entry->pages * sizeof(*entry->busaddr),
79282199Sdumbbell	    DRM_MEM_SGLISTS, M_NOWAIT | M_ZERO);
80282199Sdumbbell	if (!entry->busaddr) {
81282199Sdumbbell		free(entry, DRM_MEM_DRIVER);
82282199Sdumbbell		return -ENOMEM;
83282199Sdumbbell	}
84235783Skib
85282199Sdumbbell	entry->vaddr = drm_vmalloc_dma(size);
86235783Skib	if (entry->vaddr == 0) {
87282199Sdumbbell		free(entry->busaddr, DRM_MEM_DRIVER);
88282199Sdumbbell		free(entry, DRM_MEM_DRIVER);
89282199Sdumbbell		return -ENOMEM;
90235783Skib	}
91235783Skib
92282199Sdumbbell	for (pindex = 0; pindex < entry->pages; pindex++) {
93235783Skib		entry->busaddr[pindex] =
94235783Skib		    vtophys(entry->vaddr + IDX_TO_OFF(pindex));
95235783Skib	}
96235783Skib
97282199Sdumbbell	request->handle = entry->vaddr;
98282199Sdumbbell
99235783Skib	dev->sg = entry;
100235783Skib
101235783Skib	DRM_DEBUG("allocated %ju pages @ 0x%08zx, contents=%08lx\n",
102235783Skib	    entry->pages, entry->vaddr, *(unsigned long *)entry->vaddr);
103235783Skib
104282199Sdumbbell	return 0;
105235783Skib}
106235783Skib
107282199Sdumbbellint drm_sg_alloc_ioctl(struct drm_device *dev, void *data,
108282199Sdumbbell		       struct drm_file *file_priv)
109235783Skib{
110235783Skib	struct drm_scatter_gather *request = data;
111235783Skib
112282199Sdumbbell	return drm_sg_alloc(dev, request);
113235783Skib
114235783Skib}
115235783Skib
116282199Sdumbbellint drm_sg_free(struct drm_device *dev, void *data,
117282199Sdumbbell		struct drm_file *file_priv)
118235783Skib{
119235783Skib	struct drm_scatter_gather *request = data;
120235783Skib	struct drm_sg_mem *entry;
121235783Skib
122282199Sdumbbell	if (!drm_core_check_feature(dev, DRIVER_SG))
123282199Sdumbbell		return -EINVAL;
124282199Sdumbbell
125235783Skib	entry = dev->sg;
126235783Skib	dev->sg = NULL;
127235783Skib
128235783Skib	if (!entry || entry->vaddr != request->handle)
129282199Sdumbbell		return -EINVAL;
130235783Skib
131235783Skib	DRM_DEBUG("free 0x%zx\n", entry->vaddr);
132235783Skib
133235783Skib	drm_sg_cleanup(entry);
134235783Skib
135282199Sdumbbell	return 0;
136235783Skib}
137