Loading...
1/*
2 * psb GEM interface
3 *
4 * Copyright (c) 2011, Intel Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Authors: Alan Cox
20 *
21 * TODO:
22 * - we need to work out if the MMU is relevant (eg for
23 * accelerated operations on a GEM object)
24 */
25
26#include <drm/drmP.h>
27#include <drm/drm.h>
28#include <drm/gma_drm.h>
29#include <drm/drm_vma_manager.h>
30#include "psb_drv.h"
31
32void psb_gem_free_object(struct drm_gem_object *obj)
33{
34 struct gtt_range *gtt = container_of(obj, struct gtt_range, gem);
35
36 /* Remove the list map if one is present */
37 drm_gem_free_mmap_offset(obj);
38 drm_gem_object_release(obj);
39
40 /* This must occur last as it frees up the memory of the GEM object */
41 psb_gtt_free_range(obj->dev, gtt);
42}
43
44int psb_gem_get_aperture(struct drm_device *dev, void *data,
45 struct drm_file *file)
46{
47 return -EINVAL;
48}
49
50/**
51 * psb_gem_dumb_map_gtt - buffer mapping for dumb interface
52 * @file: our drm client file
53 * @dev: drm device
54 * @handle: GEM handle to the object (from dumb_create)
55 *
56 * Do the necessary setup to allow the mapping of the frame buffer
57 * into user memory. We don't have to do much here at the moment.
58 */
59int psb_gem_dumb_map_gtt(struct drm_file *file, struct drm_device *dev,
60 uint32_t handle, uint64_t *offset)
61{
62 int ret = 0;
63 struct drm_gem_object *obj;
64
65 /* GEM does all our handle to object mapping */
66 obj = drm_gem_object_lookup(dev, file, handle);
67 if (obj == NULL)
68 return -ENOENT;
69
70 /* Make it mmapable */
71 ret = drm_gem_create_mmap_offset(obj);
72 if (ret)
73 goto out;
74 *offset = drm_vma_node_offset_addr(&obj->vma_node);
75out:
76 drm_gem_object_unreference_unlocked(obj);
77 return ret;
78}
79
80/**
81 * psb_gem_create - create a mappable object
82 * @file: the DRM file of the client
83 * @dev: our device
84 * @size: the size requested
85 * @handlep: returned handle (opaque number)
86 *
87 * Create a GEM object, fill in the boilerplate and attach a handle to
88 * it so that userspace can speak about it. This does the core work
89 * for the various methods that do/will create GEM objects for things
90 */
91int psb_gem_create(struct drm_file *file, struct drm_device *dev, u64 size,
92 u32 *handlep, int stolen, u32 align)
93{
94 struct gtt_range *r;
95 int ret;
96 u32 handle;
97
98 size = roundup(size, PAGE_SIZE);
99
100 /* Allocate our object - for now a direct gtt range which is not
101 stolen memory backed */
102 r = psb_gtt_alloc_range(dev, size, "gem", 0, PAGE_SIZE);
103 if (r == NULL) {
104 dev_err(dev->dev, "no memory for %lld byte GEM object\n", size);
105 return -ENOSPC;
106 }
107 /* Initialize the extra goodies GEM needs to do all the hard work */
108 if (drm_gem_object_init(dev, &r->gem, size) != 0) {
109 psb_gtt_free_range(dev, r);
110 /* GEM doesn't give an error code so use -ENOMEM */
111 dev_err(dev->dev, "GEM init failed for %lld\n", size);
112 return -ENOMEM;
113 }
114 /* Limit the object to 32bit mappings */
115 mapping_set_gfp_mask(r->gem.filp->f_mapping, GFP_KERNEL | __GFP_DMA32);
116 /* Give the object a handle so we can carry it more easily */
117 ret = drm_gem_handle_create(file, &r->gem, &handle);
118 if (ret) {
119 dev_err(dev->dev, "GEM handle failed for %p, %lld\n",
120 &r->gem, size);
121 drm_gem_object_release(&r->gem);
122 psb_gtt_free_range(dev, r);
123 return ret;
124 }
125 /* We have the initial and handle reference but need only one now */
126 drm_gem_object_unreference_unlocked(&r->gem);
127 *handlep = handle;
128 return 0;
129}
130
131/**
132 * psb_gem_dumb_create - create a dumb buffer
133 * @drm_file: our client file
134 * @dev: our device
135 * @args: the requested arguments copied from userspace
136 *
137 * Allocate a buffer suitable for use for a frame buffer of the
138 * form described by user space. Give userspace a handle by which
139 * to reference it.
140 */
141int psb_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
142 struct drm_mode_create_dumb *args)
143{
144 args->pitch = ALIGN(args->width * ((args->bpp + 7) / 8), 64);
145 args->size = args->pitch * args->height;
146 return psb_gem_create(file, dev, args->size, &args->handle, 0,
147 PAGE_SIZE);
148}
149
150/**
151 * psb_gem_fault - pagefault handler for GEM objects
152 * @vma: the VMA of the GEM object
153 * @vmf: fault detail
154 *
155 * Invoked when a fault occurs on an mmap of a GEM managed area. GEM
156 * does most of the work for us including the actual map/unmap calls
157 * but we need to do the actual page work.
158 *
159 * This code eventually needs to handle faulting objects in and out
160 * of the GTT and repacking it when we run out of space. We can put
161 * that off for now and for our simple uses
162 *
163 * The VMA was set up by GEM. In doing so it also ensured that the
164 * vma->vm_private_data points to the GEM object that is backing this
165 * mapping.
166 */
167int psb_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
168{
169 struct drm_gem_object *obj;
170 struct gtt_range *r;
171 int ret;
172 unsigned long pfn;
173 pgoff_t page_offset;
174 struct drm_device *dev;
175 struct drm_psb_private *dev_priv;
176
177 obj = vma->vm_private_data; /* GEM object */
178 dev = obj->dev;
179 dev_priv = dev->dev_private;
180
181 r = container_of(obj, struct gtt_range, gem); /* Get the gtt range */
182
183 /* Make sure we don't parallel update on a fault, nor move or remove
184 something from beneath our feet */
185 mutex_lock(&dev_priv->mmap_mutex);
186
187 /* For now the mmap pins the object and it stays pinned. As things
188 stand that will do us no harm */
189 if (r->mmapping == 0) {
190 ret = psb_gtt_pin(r);
191 if (ret < 0) {
192 dev_err(dev->dev, "gma500: pin failed: %d\n", ret);
193 goto fail;
194 }
195 r->mmapping = 1;
196 }
197
198 /* Page relative to the VMA start - we must calculate this ourselves
199 because vmf->pgoff is the fake GEM offset */
200 page_offset = ((unsigned long) vmf->virtual_address - vma->vm_start)
201 >> PAGE_SHIFT;
202
203 /* CPU view of the page, don't go via the GART for CPU writes */
204 if (r->stolen)
205 pfn = (dev_priv->stolen_base + r->offset) >> PAGE_SHIFT;
206 else
207 pfn = page_to_pfn(r->pages[page_offset]);
208 ret = vm_insert_pfn(vma, (unsigned long)vmf->virtual_address, pfn);
209
210fail:
211 mutex_unlock(&dev_priv->mmap_mutex);
212 switch (ret) {
213 case 0:
214 case -ERESTARTSYS:
215 case -EINTR:
216 return VM_FAULT_NOPAGE;
217 case -ENOMEM:
218 return VM_FAULT_OOM;
219 default:
220 return VM_FAULT_SIGBUS;
221 }
222}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * psb GEM interface
4 *
5 * Copyright (c) 2011, Intel Corporation.
6 *
7 * Authors: Alan Cox
8 *
9 * TODO:
10 * - we need to work out if the MMU is relevant (eg for
11 * accelerated operations on a GEM object)
12 */
13
14#include <linux/pagemap.h>
15
16#include <drm/drm.h>
17#include <drm/drm_vma_manager.h>
18
19#include "gem.h"
20#include "psb_drv.h"
21
22static vm_fault_t psb_gem_fault(struct vm_fault *vmf);
23
24static void psb_gem_free_object(struct drm_gem_object *obj)
25{
26 struct gtt_range *gtt = container_of(obj, struct gtt_range, gem);
27
28 /* Remove the list map if one is present */
29 drm_gem_free_mmap_offset(obj);
30 drm_gem_object_release(obj);
31
32 /* This must occur last as it frees up the memory of the GEM object */
33 psb_gtt_free_range(obj->dev, gtt);
34}
35
36static const struct vm_operations_struct psb_gem_vm_ops = {
37 .fault = psb_gem_fault,
38 .open = drm_gem_vm_open,
39 .close = drm_gem_vm_close,
40};
41
42const struct drm_gem_object_funcs psb_gem_object_funcs = {
43 .free = psb_gem_free_object,
44 .vm_ops = &psb_gem_vm_ops,
45};
46
47/**
48 * psb_gem_create - create a mappable object
49 * @file: the DRM file of the client
50 * @dev: our device
51 * @size: the size requested
52 * @handlep: returned handle (opaque number)
53 * @stolen: unused
54 * @align: unused
55 *
56 * Create a GEM object, fill in the boilerplate and attach a handle to
57 * it so that userspace can speak about it. This does the core work
58 * for the various methods that do/will create GEM objects for things
59 */
60int psb_gem_create(struct drm_file *file, struct drm_device *dev, u64 size,
61 u32 *handlep, int stolen, u32 align)
62{
63 struct gtt_range *r;
64 int ret;
65 u32 handle;
66
67 size = roundup(size, PAGE_SIZE);
68
69 /* Allocate our object - for now a direct gtt range which is not
70 stolen memory backed */
71 r = psb_gtt_alloc_range(dev, size, "gem", 0, PAGE_SIZE);
72 if (r == NULL) {
73 dev_err(dev->dev, "no memory for %lld byte GEM object\n", size);
74 return -ENOSPC;
75 }
76 r->gem.funcs = &psb_gem_object_funcs;
77 /* Initialize the extra goodies GEM needs to do all the hard work */
78 if (drm_gem_object_init(dev, &r->gem, size) != 0) {
79 psb_gtt_free_range(dev, r);
80 /* GEM doesn't give an error code so use -ENOMEM */
81 dev_err(dev->dev, "GEM init failed for %lld\n", size);
82 return -ENOMEM;
83 }
84 /* Limit the object to 32bit mappings */
85 mapping_set_gfp_mask(r->gem.filp->f_mapping, GFP_KERNEL | __GFP_DMA32);
86 /* Give the object a handle so we can carry it more easily */
87 ret = drm_gem_handle_create(file, &r->gem, &handle);
88 if (ret) {
89 dev_err(dev->dev, "GEM handle failed for %p, %lld\n",
90 &r->gem, size);
91 drm_gem_object_release(&r->gem);
92 psb_gtt_free_range(dev, r);
93 return ret;
94 }
95 /* We have the initial and handle reference but need only one now */
96 drm_gem_object_put(&r->gem);
97 *handlep = handle;
98 return 0;
99}
100
101/**
102 * psb_gem_dumb_create - create a dumb buffer
103 * @file: our client file
104 * @dev: our device
105 * @args: the requested arguments copied from userspace
106 *
107 * Allocate a buffer suitable for use for a frame buffer of the
108 * form described by user space. Give userspace a handle by which
109 * to reference it.
110 */
111int psb_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
112 struct drm_mode_create_dumb *args)
113{
114 args->pitch = ALIGN(args->width * ((args->bpp + 7) / 8), 64);
115 args->size = args->pitch * args->height;
116 return psb_gem_create(file, dev, args->size, &args->handle, 0,
117 PAGE_SIZE);
118}
119
120/**
121 * psb_gem_fault - pagefault handler for GEM objects
122 * @vmf: fault detail
123 *
124 * Invoked when a fault occurs on an mmap of a GEM managed area. GEM
125 * does most of the work for us including the actual map/unmap calls
126 * but we need to do the actual page work.
127 *
128 * This code eventually needs to handle faulting objects in and out
129 * of the GTT and repacking it when we run out of space. We can put
130 * that off for now and for our simple uses
131 *
132 * The VMA was set up by GEM. In doing so it also ensured that the
133 * vma->vm_private_data points to the GEM object that is backing this
134 * mapping.
135 */
136static vm_fault_t psb_gem_fault(struct vm_fault *vmf)
137{
138 struct vm_area_struct *vma = vmf->vma;
139 struct drm_gem_object *obj;
140 struct gtt_range *r;
141 int err;
142 vm_fault_t ret;
143 unsigned long pfn;
144 pgoff_t page_offset;
145 struct drm_device *dev;
146 struct drm_psb_private *dev_priv;
147
148 obj = vma->vm_private_data; /* GEM object */
149 dev = obj->dev;
150 dev_priv = dev->dev_private;
151
152 r = container_of(obj, struct gtt_range, gem); /* Get the gtt range */
153
154 /* Make sure we don't parallel update on a fault, nor move or remove
155 something from beneath our feet */
156 mutex_lock(&dev_priv->mmap_mutex);
157
158 /* For now the mmap pins the object and it stays pinned. As things
159 stand that will do us no harm */
160 if (r->mmapping == 0) {
161 err = psb_gtt_pin(r);
162 if (err < 0) {
163 dev_err(dev->dev, "gma500: pin failed: %d\n", err);
164 ret = vmf_error(err);
165 goto fail;
166 }
167 r->mmapping = 1;
168 }
169
170 /* Page relative to the VMA start - we must calculate this ourselves
171 because vmf->pgoff is the fake GEM offset */
172 page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
173
174 /* CPU view of the page, don't go via the GART for CPU writes */
175 if (r->stolen)
176 pfn = (dev_priv->stolen_base + r->offset) >> PAGE_SHIFT;
177 else
178 pfn = page_to_pfn(r->pages[page_offset]);
179 ret = vmf_insert_pfn(vma, vmf->address, pfn);
180fail:
181 mutex_unlock(&dev_priv->mmap_mutex);
182
183 return ret;
184}