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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2012 Russell King
4 */
5
6#include <linux/dma-buf.h>
7#include <linux/dma-mapping.h>
8#include <linux/mman.h>
9#include <linux/shmem_fs.h>
10
11#include <drm/armada_drm.h>
12#include <drm/drm_prime.h>
13
14#include "armada_drm.h"
15#include "armada_gem.h"
16#include "armada_ioctlP.h"
17
18MODULE_IMPORT_NS("DMA_BUF");
19
20static vm_fault_t armada_gem_vm_fault(struct vm_fault *vmf)
21{
22 struct drm_gem_object *gobj = vmf->vma->vm_private_data;
23 struct armada_gem_object *obj = drm_to_armada_gem(gobj);
24 unsigned long pfn = obj->phys_addr >> PAGE_SHIFT;
25
26 pfn += (vmf->address - vmf->vma->vm_start) >> PAGE_SHIFT;
27 return vmf_insert_pfn(vmf->vma, vmf->address, pfn);
28}
29
30static const struct vm_operations_struct armada_gem_vm_ops = {
31 .fault = armada_gem_vm_fault,
32 .open = drm_gem_vm_open,
33 .close = drm_gem_vm_close,
34};
35
36static size_t roundup_gem_size(size_t size)
37{
38 return roundup(size, PAGE_SIZE);
39}
40
41void armada_gem_free_object(struct drm_gem_object *obj)
42{
43 struct armada_gem_object *dobj = drm_to_armada_gem(obj);
44 struct armada_private *priv = drm_to_armada_dev(obj->dev);
45
46 DRM_DEBUG_DRIVER("release obj %p\n", dobj);
47
48 drm_gem_free_mmap_offset(&dobj->obj);
49
50 might_lock(&priv->linear_lock);
51
52 if (dobj->page) {
53 /* page backed memory */
54 unsigned int order = get_order(dobj->obj.size);
55 __free_pages(dobj->page, order);
56 } else if (dobj->linear) {
57 /* linear backed memory */
58 mutex_lock(&priv->linear_lock);
59 drm_mm_remove_node(dobj->linear);
60 mutex_unlock(&priv->linear_lock);
61 kfree(dobj->linear);
62 if (dobj->addr)
63 iounmap(dobj->addr);
64 }
65
66 if (dobj->obj.import_attach) {
67 /* We only ever display imported data */
68 if (dobj->sgt)
69 dma_buf_unmap_attachment_unlocked(dobj->obj.import_attach,
70 dobj->sgt, DMA_TO_DEVICE);
71 drm_prime_gem_destroy(&dobj->obj, NULL);
72 }
73
74 drm_gem_object_release(&dobj->obj);
75
76 kfree(dobj);
77}
78
79int
80armada_gem_linear_back(struct drm_device *dev, struct armada_gem_object *obj)
81{
82 struct armada_private *priv = drm_to_armada_dev(dev);
83 size_t size = obj->obj.size;
84
85 if (obj->page || obj->linear)
86 return 0;
87
88 /*
89 * If it is a small allocation (typically cursor, which will
90 * be 32x64 or 64x32 ARGB pixels) try to get it from the system.
91 * Framebuffers will never be this small (our minimum size for
92 * framebuffers is larger than this anyway.) Such objects are
93 * only accessed by the CPU so we don't need any special handing
94 * here.
95 */
96 if (size <= 8192) {
97 unsigned int order = get_order(size);
98 struct page *p = alloc_pages(GFP_KERNEL, order);
99
100 if (p) {
101 obj->addr = page_address(p);
102 obj->phys_addr = page_to_phys(p);
103 obj->page = p;
104
105 memset(obj->addr, 0, PAGE_ALIGN(size));
106 }
107 }
108
109 /*
110 * We could grab something from DMA if it's enabled, but that
111 * involves building in a problem:
112 *
113 * GEM DMA helper interface uses dma_alloc_coherent(), which provides
114 * us with an CPU virtual address and a device address.
115 *
116 * The CPU virtual address may be either an address in the kernel
117 * direct mapped region (for example, as it would be on x86) or
118 * it may be remapped into another part of kernel memory space
119 * (eg, as it would be on ARM.) This means virt_to_phys() on the
120 * returned virtual address is invalid depending on the architecture
121 * implementation.
122 *
123 * The device address may also not be a physical address; it may
124 * be that there is some kind of remapping between the device and
125 * system RAM, which makes the use of the device address also
126 * unsafe to re-use as a physical address.
127 *
128 * This makes DRM usage of dma_alloc_coherent() in a generic way
129 * at best very questionable and unsafe.
130 */
131
132 /* Otherwise, grab it from our linear allocation */
133 if (!obj->page) {
134 struct drm_mm_node *node;
135 unsigned align = min_t(unsigned, size, SZ_2M);
136 void __iomem *ptr;
137 int ret;
138
139 node = kzalloc(sizeof(*node), GFP_KERNEL);
140 if (!node)
141 return -ENOSPC;
142
143 mutex_lock(&priv->linear_lock);
144 ret = drm_mm_insert_node_generic(&priv->linear, node,
145 size, align, 0, 0);
146 mutex_unlock(&priv->linear_lock);
147 if (ret) {
148 kfree(node);
149 return ret;
150 }
151
152 obj->linear = node;
153
154 /* Ensure that the memory we're returning is cleared. */
155 ptr = ioremap_wc(obj->linear->start, size);
156 if (!ptr) {
157 mutex_lock(&priv->linear_lock);
158 drm_mm_remove_node(obj->linear);
159 mutex_unlock(&priv->linear_lock);
160 kfree(obj->linear);
161 obj->linear = NULL;
162 return -ENOMEM;
163 }
164
165 memset_io(ptr, 0, size);
166 iounmap(ptr);
167
168 obj->phys_addr = obj->linear->start;
169 obj->dev_addr = obj->linear->start;
170 obj->mapped = true;
171 }
172
173 DRM_DEBUG_DRIVER("obj %p phys %#llx dev %#llx\n", obj,
174 (unsigned long long)obj->phys_addr,
175 (unsigned long long)obj->dev_addr);
176
177 return 0;
178}
179
180void *
181armada_gem_map_object(struct drm_device *dev, struct armada_gem_object *dobj)
182{
183 /* only linear objects need to be ioremap'd */
184 if (!dobj->addr && dobj->linear)
185 dobj->addr = ioremap_wc(dobj->phys_addr, dobj->obj.size);
186 return dobj->addr;
187}
188
189static const struct drm_gem_object_funcs armada_gem_object_funcs = {
190 .free = armada_gem_free_object,
191 .export = armada_gem_prime_export,
192 .vm_ops = &armada_gem_vm_ops,
193};
194
195struct armada_gem_object *
196armada_gem_alloc_private_object(struct drm_device *dev, size_t size)
197{
198 struct armada_gem_object *obj;
199
200 size = roundup_gem_size(size);
201
202 obj = kzalloc(sizeof(*obj), GFP_KERNEL);
203 if (!obj)
204 return NULL;
205
206 obj->obj.funcs = &armada_gem_object_funcs;
207
208 drm_gem_private_object_init(dev, &obj->obj, size);
209
210 DRM_DEBUG_DRIVER("alloc private obj %p size %zu\n", obj, size);
211
212 return obj;
213}
214
215static struct armada_gem_object *armada_gem_alloc_object(struct drm_device *dev,
216 size_t size)
217{
218 struct armada_gem_object *obj;
219 struct address_space *mapping;
220
221 size = roundup_gem_size(size);
222
223 obj = kzalloc(sizeof(*obj), GFP_KERNEL);
224 if (!obj)
225 return NULL;
226
227 obj->obj.funcs = &armada_gem_object_funcs;
228
229 if (drm_gem_object_init(dev, &obj->obj, size)) {
230 kfree(obj);
231 return NULL;
232 }
233
234 mapping = obj->obj.filp->f_mapping;
235 mapping_set_gfp_mask(mapping, GFP_HIGHUSER | __GFP_RECLAIMABLE);
236
237 DRM_DEBUG_DRIVER("alloc obj %p size %zu\n", obj, size);
238
239 return obj;
240}
241
242/* Dumb alloc support */
243int armada_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
244 struct drm_mode_create_dumb *args)
245{
246 struct armada_gem_object *dobj;
247 u32 handle;
248 size_t size;
249 int ret;
250
251 args->pitch = armada_pitch(args->width, args->bpp);
252 args->size = size = args->pitch * args->height;
253
254 dobj = armada_gem_alloc_private_object(dev, size);
255 if (dobj == NULL)
256 return -ENOMEM;
257
258 ret = armada_gem_linear_back(dev, dobj);
259 if (ret)
260 goto err;
261
262 ret = drm_gem_handle_create(file, &dobj->obj, &handle);
263 if (ret)
264 goto err;
265
266 args->handle = handle;
267
268 /* drop reference from allocate - handle holds it now */
269 DRM_DEBUG_DRIVER("obj %p size %zu handle %#x\n", dobj, size, handle);
270 err:
271 drm_gem_object_put(&dobj->obj);
272 return ret;
273}
274
275/* Private driver gem ioctls */
276int armada_gem_create_ioctl(struct drm_device *dev, void *data,
277 struct drm_file *file)
278{
279 struct drm_armada_gem_create *args = data;
280 struct armada_gem_object *dobj;
281 size_t size;
282 u32 handle;
283 int ret;
284
285 if (args->size == 0)
286 return -ENOMEM;
287
288 size = args->size;
289
290 dobj = armada_gem_alloc_object(dev, size);
291 if (dobj == NULL)
292 return -ENOMEM;
293
294 ret = drm_gem_handle_create(file, &dobj->obj, &handle);
295 if (ret)
296 goto err;
297
298 args->handle = handle;
299
300 /* drop reference from allocate - handle holds it now */
301 DRM_DEBUG_DRIVER("obj %p size %zu handle %#x\n", dobj, size, handle);
302 err:
303 drm_gem_object_put(&dobj->obj);
304 return ret;
305}
306
307/* Map a shmem-backed object into process memory space */
308int armada_gem_mmap_ioctl(struct drm_device *dev, void *data,
309 struct drm_file *file)
310{
311 struct drm_armada_gem_mmap *args = data;
312 struct armada_gem_object *dobj;
313 unsigned long addr;
314
315 dobj = armada_gem_object_lookup(file, args->handle);
316 if (dobj == NULL)
317 return -ENOENT;
318
319 if (!dobj->obj.filp) {
320 drm_gem_object_put(&dobj->obj);
321 return -EINVAL;
322 }
323
324 addr = vm_mmap(dobj->obj.filp, 0, args->size, PROT_READ | PROT_WRITE,
325 MAP_SHARED, args->offset);
326 drm_gem_object_put(&dobj->obj);
327 if (IS_ERR_VALUE(addr))
328 return addr;
329
330 args->addr = addr;
331
332 return 0;
333}
334
335int armada_gem_pwrite_ioctl(struct drm_device *dev, void *data,
336 struct drm_file *file)
337{
338 struct drm_armada_gem_pwrite *args = data;
339 struct armada_gem_object *dobj;
340 char __user *ptr;
341 int ret = 0;
342
343 DRM_DEBUG_DRIVER("handle %u off %u size %u ptr 0x%llx\n",
344 args->handle, args->offset, args->size, args->ptr);
345
346 if (args->size == 0)
347 return 0;
348
349 ptr = (char __user *)(uintptr_t)args->ptr;
350
351 if (!access_ok(ptr, args->size))
352 return -EFAULT;
353
354 if (fault_in_readable(ptr, args->size))
355 return -EFAULT;
356
357 dobj = armada_gem_object_lookup(file, args->handle);
358 if (dobj == NULL)
359 return -ENOENT;
360
361 /* Must be a kernel-mapped object */
362 if (!dobj->addr)
363 return -EINVAL;
364
365 if (args->offset > dobj->obj.size ||
366 args->size > dobj->obj.size - args->offset) {
367 DRM_ERROR("invalid size: object size %u\n", dobj->obj.size);
368 ret = -EINVAL;
369 goto unref;
370 }
371
372 if (copy_from_user(dobj->addr + args->offset, ptr, args->size)) {
373 ret = -EFAULT;
374 } else if (dobj->update) {
375 dobj->update(dobj->update_data);
376 ret = 0;
377 }
378
379 unref:
380 drm_gem_object_put(&dobj->obj);
381 return ret;
382}
383
384/* Prime support */
385static struct sg_table *
386armada_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
387 enum dma_data_direction dir)
388{
389 struct drm_gem_object *obj = attach->dmabuf->priv;
390 struct armada_gem_object *dobj = drm_to_armada_gem(obj);
391 struct scatterlist *sg;
392 struct sg_table *sgt;
393 int i;
394
395 sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
396 if (!sgt)
397 return NULL;
398
399 if (dobj->obj.filp) {
400 struct address_space *mapping;
401 int count;
402
403 count = dobj->obj.size / PAGE_SIZE;
404 if (sg_alloc_table(sgt, count, GFP_KERNEL))
405 goto free_sgt;
406
407 mapping = dobj->obj.filp->f_mapping;
408
409 for_each_sgtable_sg(sgt, sg, i) {
410 struct page *page;
411
412 page = shmem_read_mapping_page(mapping, i);
413 if (IS_ERR(page))
414 goto release;
415
416 sg_set_page(sg, page, PAGE_SIZE, 0);
417 }
418
419 if (dma_map_sgtable(attach->dev, sgt, dir, 0))
420 goto release;
421 } else if (dobj->page) {
422 /* Single contiguous page */
423 if (sg_alloc_table(sgt, 1, GFP_KERNEL))
424 goto free_sgt;
425
426 sg_set_page(sgt->sgl, dobj->page, dobj->obj.size, 0);
427
428 if (dma_map_sgtable(attach->dev, sgt, dir, 0))
429 goto free_table;
430 } else if (dobj->linear) {
431 /* Single contiguous physical region - no struct page */
432 if (sg_alloc_table(sgt, 1, GFP_KERNEL))
433 goto free_sgt;
434 sg_dma_address(sgt->sgl) = dobj->dev_addr;
435 sg_dma_len(sgt->sgl) = dobj->obj.size;
436 } else {
437 goto free_sgt;
438 }
439 return sgt;
440
441 release:
442 for_each_sgtable_sg(sgt, sg, i)
443 if (sg_page(sg))
444 put_page(sg_page(sg));
445 free_table:
446 sg_free_table(sgt);
447 free_sgt:
448 kfree(sgt);
449 return NULL;
450}
451
452static void armada_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
453 struct sg_table *sgt, enum dma_data_direction dir)
454{
455 struct drm_gem_object *obj = attach->dmabuf->priv;
456 struct armada_gem_object *dobj = drm_to_armada_gem(obj);
457 int i;
458
459 if (!dobj->linear)
460 dma_unmap_sgtable(attach->dev, sgt, dir, 0);
461
462 if (dobj->obj.filp) {
463 struct scatterlist *sg;
464
465 for_each_sgtable_sg(sgt, sg, i)
466 put_page(sg_page(sg));
467 }
468
469 sg_free_table(sgt);
470 kfree(sgt);
471}
472
473static int
474armada_gem_dmabuf_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
475{
476 return -EINVAL;
477}
478
479static const struct dma_buf_ops armada_gem_prime_dmabuf_ops = {
480 .map_dma_buf = armada_gem_prime_map_dma_buf,
481 .unmap_dma_buf = armada_gem_prime_unmap_dma_buf,
482 .release = drm_gem_dmabuf_release,
483 .mmap = armada_gem_dmabuf_mmap,
484};
485
486struct dma_buf *
487armada_gem_prime_export(struct drm_gem_object *obj, int flags)
488{
489 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
490
491 exp_info.ops = &armada_gem_prime_dmabuf_ops;
492 exp_info.size = obj->size;
493 exp_info.flags = O_RDWR;
494 exp_info.priv = obj;
495
496 return drm_gem_dmabuf_export(obj->dev, &exp_info);
497}
498
499struct drm_gem_object *
500armada_gem_prime_import(struct drm_device *dev, struct dma_buf *buf)
501{
502 struct dma_buf_attachment *attach;
503 struct armada_gem_object *dobj;
504
505 if (buf->ops == &armada_gem_prime_dmabuf_ops) {
506 struct drm_gem_object *obj = buf->priv;
507 if (obj->dev == dev) {
508 /*
509 * Importing our own dmabuf(s) increases the
510 * refcount on the gem object itself.
511 */
512 drm_gem_object_get(obj);
513 return obj;
514 }
515 }
516
517 attach = dma_buf_attach(buf, dev->dev);
518 if (IS_ERR(attach))
519 return ERR_CAST(attach);
520
521 dobj = armada_gem_alloc_private_object(dev, buf->size);
522 if (!dobj) {
523 dma_buf_detach(buf, attach);
524 return ERR_PTR(-ENOMEM);
525 }
526
527 dobj->obj.import_attach = attach;
528 get_dma_buf(buf);
529
530 /*
531 * Don't call dma_buf_map_attachment() here - it maps the
532 * scatterlist immediately for DMA, and this is not always
533 * an appropriate thing to do.
534 */
535 return &dobj->obj;
536}
537
538int armada_gem_map_import(struct armada_gem_object *dobj)
539{
540 int ret;
541
542 dobj->sgt = dma_buf_map_attachment_unlocked(dobj->obj.import_attach,
543 DMA_TO_DEVICE);
544 if (IS_ERR(dobj->sgt)) {
545 ret = PTR_ERR(dobj->sgt);
546 dobj->sgt = NULL;
547 DRM_ERROR("dma_buf_map_attachment() error: %d\n", ret);
548 return ret;
549 }
550 if (dobj->sgt->nents > 1) {
551 DRM_ERROR("dma_buf_map_attachment() returned an (unsupported) scattered list\n");
552 return -EINVAL;
553 }
554 if (sg_dma_len(dobj->sgt->sgl) < dobj->obj.size) {
555 DRM_ERROR("dma_buf_map_attachment() returned a small buffer\n");
556 return -EINVAL;
557 }
558 dobj->dev_addr = sg_dma_address(dobj->sgt->sgl);
559 dobj->mapped = true;
560 return 0;
561}
1/*
2 * Copyright (C) 2012 Russell King
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8#include <linux/dma-buf.h>
9#include <linux/dma-mapping.h>
10#include <linux/shmem_fs.h>
11#include "armada_drm.h"
12#include "armada_gem.h"
13#include <drm/armada_drm.h>
14#include "armada_ioctlP.h"
15
16static int armada_gem_vm_fault(struct vm_fault *vmf)
17{
18 struct drm_gem_object *gobj = vmf->vma->vm_private_data;
19 struct armada_gem_object *obj = drm_to_armada_gem(gobj);
20 unsigned long pfn = obj->phys_addr >> PAGE_SHIFT;
21 int ret;
22
23 pfn += (vmf->address - vmf->vma->vm_start) >> PAGE_SHIFT;
24 ret = vm_insert_pfn(vmf->vma, vmf->address, pfn);
25
26 switch (ret) {
27 case 0:
28 case -EBUSY:
29 return VM_FAULT_NOPAGE;
30 case -ENOMEM:
31 return VM_FAULT_OOM;
32 default:
33 return VM_FAULT_SIGBUS;
34 }
35}
36
37const struct vm_operations_struct armada_gem_vm_ops = {
38 .fault = armada_gem_vm_fault,
39 .open = drm_gem_vm_open,
40 .close = drm_gem_vm_close,
41};
42
43static size_t roundup_gem_size(size_t size)
44{
45 return roundup(size, PAGE_SIZE);
46}
47
48void armada_gem_free_object(struct drm_gem_object *obj)
49{
50 struct armada_gem_object *dobj = drm_to_armada_gem(obj);
51 struct armada_private *priv = obj->dev->dev_private;
52
53 DRM_DEBUG_DRIVER("release obj %p\n", dobj);
54
55 drm_gem_free_mmap_offset(&dobj->obj);
56
57 might_lock(&priv->linear_lock);
58
59 if (dobj->page) {
60 /* page backed memory */
61 unsigned int order = get_order(dobj->obj.size);
62 __free_pages(dobj->page, order);
63 } else if (dobj->linear) {
64 /* linear backed memory */
65 mutex_lock(&priv->linear_lock);
66 drm_mm_remove_node(dobj->linear);
67 mutex_unlock(&priv->linear_lock);
68 kfree(dobj->linear);
69 if (dobj->addr)
70 iounmap(dobj->addr);
71 }
72
73 if (dobj->obj.import_attach) {
74 /* We only ever display imported data */
75 if (dobj->sgt)
76 dma_buf_unmap_attachment(dobj->obj.import_attach,
77 dobj->sgt, DMA_TO_DEVICE);
78 drm_prime_gem_destroy(&dobj->obj, NULL);
79 }
80
81 drm_gem_object_release(&dobj->obj);
82
83 kfree(dobj);
84}
85
86int
87armada_gem_linear_back(struct drm_device *dev, struct armada_gem_object *obj)
88{
89 struct armada_private *priv = dev->dev_private;
90 size_t size = obj->obj.size;
91
92 if (obj->page || obj->linear)
93 return 0;
94
95 /*
96 * If it is a small allocation (typically cursor, which will
97 * be 32x64 or 64x32 ARGB pixels) try to get it from the system.
98 * Framebuffers will never be this small (our minimum size for
99 * framebuffers is larger than this anyway.) Such objects are
100 * only accessed by the CPU so we don't need any special handing
101 * here.
102 */
103 if (size <= 8192) {
104 unsigned int order = get_order(size);
105 struct page *p = alloc_pages(GFP_KERNEL, order);
106
107 if (p) {
108 obj->addr = page_address(p);
109 obj->phys_addr = page_to_phys(p);
110 obj->page = p;
111
112 memset(obj->addr, 0, PAGE_ALIGN(size));
113 }
114 }
115
116 /*
117 * We could grab something from CMA if it's enabled, but that
118 * involves building in a problem:
119 *
120 * CMA's interface uses dma_alloc_coherent(), which provides us
121 * with an CPU virtual address and a device address.
122 *
123 * The CPU virtual address may be either an address in the kernel
124 * direct mapped region (for example, as it would be on x86) or
125 * it may be remapped into another part of kernel memory space
126 * (eg, as it would be on ARM.) This means virt_to_phys() on the
127 * returned virtual address is invalid depending on the architecture
128 * implementation.
129 *
130 * The device address may also not be a physical address; it may
131 * be that there is some kind of remapping between the device and
132 * system RAM, which makes the use of the device address also
133 * unsafe to re-use as a physical address.
134 *
135 * This makes DRM usage of dma_alloc_coherent() in a generic way
136 * at best very questionable and unsafe.
137 */
138
139 /* Otherwise, grab it from our linear allocation */
140 if (!obj->page) {
141 struct drm_mm_node *node;
142 unsigned align = min_t(unsigned, size, SZ_2M);
143 void __iomem *ptr;
144 int ret;
145
146 node = kzalloc(sizeof(*node), GFP_KERNEL);
147 if (!node)
148 return -ENOSPC;
149
150 mutex_lock(&priv->linear_lock);
151 ret = drm_mm_insert_node_generic(&priv->linear, node,
152 size, align, 0, 0);
153 mutex_unlock(&priv->linear_lock);
154 if (ret) {
155 kfree(node);
156 return ret;
157 }
158
159 obj->linear = node;
160
161 /* Ensure that the memory we're returning is cleared. */
162 ptr = ioremap_wc(obj->linear->start, size);
163 if (!ptr) {
164 mutex_lock(&priv->linear_lock);
165 drm_mm_remove_node(obj->linear);
166 mutex_unlock(&priv->linear_lock);
167 kfree(obj->linear);
168 obj->linear = NULL;
169 return -ENOMEM;
170 }
171
172 memset_io(ptr, 0, size);
173 iounmap(ptr);
174
175 obj->phys_addr = obj->linear->start;
176 obj->dev_addr = obj->linear->start;
177 obj->mapped = true;
178 }
179
180 DRM_DEBUG_DRIVER("obj %p phys %#llx dev %#llx\n", obj,
181 (unsigned long long)obj->phys_addr,
182 (unsigned long long)obj->dev_addr);
183
184 return 0;
185}
186
187void *
188armada_gem_map_object(struct drm_device *dev, struct armada_gem_object *dobj)
189{
190 /* only linear objects need to be ioremap'd */
191 if (!dobj->addr && dobj->linear)
192 dobj->addr = ioremap_wc(dobj->phys_addr, dobj->obj.size);
193 return dobj->addr;
194}
195
196struct armada_gem_object *
197armada_gem_alloc_private_object(struct drm_device *dev, size_t size)
198{
199 struct armada_gem_object *obj;
200
201 size = roundup_gem_size(size);
202
203 obj = kzalloc(sizeof(*obj), GFP_KERNEL);
204 if (!obj)
205 return NULL;
206
207 drm_gem_private_object_init(dev, &obj->obj, size);
208
209 DRM_DEBUG_DRIVER("alloc private obj %p size %zu\n", obj, size);
210
211 return obj;
212}
213
214static struct armada_gem_object *armada_gem_alloc_object(struct drm_device *dev,
215 size_t size)
216{
217 struct armada_gem_object *obj;
218 struct address_space *mapping;
219
220 size = roundup_gem_size(size);
221
222 obj = kzalloc(sizeof(*obj), GFP_KERNEL);
223 if (!obj)
224 return NULL;
225
226 if (drm_gem_object_init(dev, &obj->obj, size)) {
227 kfree(obj);
228 return NULL;
229 }
230
231 mapping = obj->obj.filp->f_mapping;
232 mapping_set_gfp_mask(mapping, GFP_HIGHUSER | __GFP_RECLAIMABLE);
233
234 DRM_DEBUG_DRIVER("alloc obj %p size %zu\n", obj, size);
235
236 return obj;
237}
238
239/* Dumb alloc support */
240int armada_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
241 struct drm_mode_create_dumb *args)
242{
243 struct armada_gem_object *dobj;
244 u32 handle;
245 size_t size;
246 int ret;
247
248 args->pitch = armada_pitch(args->width, args->bpp);
249 args->size = size = args->pitch * args->height;
250
251 dobj = armada_gem_alloc_private_object(dev, size);
252 if (dobj == NULL)
253 return -ENOMEM;
254
255 ret = armada_gem_linear_back(dev, dobj);
256 if (ret)
257 goto err;
258
259 ret = drm_gem_handle_create(file, &dobj->obj, &handle);
260 if (ret)
261 goto err;
262
263 args->handle = handle;
264
265 /* drop reference from allocate - handle holds it now */
266 DRM_DEBUG_DRIVER("obj %p size %zu handle %#x\n", dobj, size, handle);
267 err:
268 drm_gem_object_put_unlocked(&dobj->obj);
269 return ret;
270}
271
272/* Private driver gem ioctls */
273int armada_gem_create_ioctl(struct drm_device *dev, void *data,
274 struct drm_file *file)
275{
276 struct drm_armada_gem_create *args = data;
277 struct armada_gem_object *dobj;
278 size_t size;
279 u32 handle;
280 int ret;
281
282 if (args->size == 0)
283 return -ENOMEM;
284
285 size = args->size;
286
287 dobj = armada_gem_alloc_object(dev, size);
288 if (dobj == NULL)
289 return -ENOMEM;
290
291 ret = drm_gem_handle_create(file, &dobj->obj, &handle);
292 if (ret)
293 goto err;
294
295 args->handle = handle;
296
297 /* drop reference from allocate - handle holds it now */
298 DRM_DEBUG_DRIVER("obj %p size %zu handle %#x\n", dobj, size, handle);
299 err:
300 drm_gem_object_put_unlocked(&dobj->obj);
301 return ret;
302}
303
304/* Map a shmem-backed object into process memory space */
305int armada_gem_mmap_ioctl(struct drm_device *dev, void *data,
306 struct drm_file *file)
307{
308 struct drm_armada_gem_mmap *args = data;
309 struct armada_gem_object *dobj;
310 unsigned long addr;
311
312 dobj = armada_gem_object_lookup(file, args->handle);
313 if (dobj == NULL)
314 return -ENOENT;
315
316 if (!dobj->obj.filp) {
317 drm_gem_object_put_unlocked(&dobj->obj);
318 return -EINVAL;
319 }
320
321 addr = vm_mmap(dobj->obj.filp, 0, args->size, PROT_READ | PROT_WRITE,
322 MAP_SHARED, args->offset);
323 drm_gem_object_put_unlocked(&dobj->obj);
324 if (IS_ERR_VALUE(addr))
325 return addr;
326
327 args->addr = addr;
328
329 return 0;
330}
331
332int armada_gem_pwrite_ioctl(struct drm_device *dev, void *data,
333 struct drm_file *file)
334{
335 struct drm_armada_gem_pwrite *args = data;
336 struct armada_gem_object *dobj;
337 char __user *ptr;
338 int ret;
339
340 DRM_DEBUG_DRIVER("handle %u off %u size %u ptr 0x%llx\n",
341 args->handle, args->offset, args->size, args->ptr);
342
343 if (args->size == 0)
344 return 0;
345
346 ptr = (char __user *)(uintptr_t)args->ptr;
347
348 if (!access_ok(VERIFY_READ, ptr, args->size))
349 return -EFAULT;
350
351 ret = fault_in_pages_readable(ptr, args->size);
352 if (ret)
353 return ret;
354
355 dobj = armada_gem_object_lookup(file, args->handle);
356 if (dobj == NULL)
357 return -ENOENT;
358
359 /* Must be a kernel-mapped object */
360 if (!dobj->addr)
361 return -EINVAL;
362
363 if (args->offset > dobj->obj.size ||
364 args->size > dobj->obj.size - args->offset) {
365 DRM_ERROR("invalid size: object size %u\n", dobj->obj.size);
366 ret = -EINVAL;
367 goto unref;
368 }
369
370 if (copy_from_user(dobj->addr + args->offset, ptr, args->size)) {
371 ret = -EFAULT;
372 } else if (dobj->update) {
373 dobj->update(dobj->update_data);
374 ret = 0;
375 }
376
377 unref:
378 drm_gem_object_put_unlocked(&dobj->obj);
379 return ret;
380}
381
382/* Prime support */
383static struct sg_table *
384armada_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
385 enum dma_data_direction dir)
386{
387 struct drm_gem_object *obj = attach->dmabuf->priv;
388 struct armada_gem_object *dobj = drm_to_armada_gem(obj);
389 struct scatterlist *sg;
390 struct sg_table *sgt;
391 int i, num;
392
393 sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
394 if (!sgt)
395 return NULL;
396
397 if (dobj->obj.filp) {
398 struct address_space *mapping;
399 int count;
400
401 count = dobj->obj.size / PAGE_SIZE;
402 if (sg_alloc_table(sgt, count, GFP_KERNEL))
403 goto free_sgt;
404
405 mapping = dobj->obj.filp->f_mapping;
406
407 for_each_sg(sgt->sgl, sg, count, i) {
408 struct page *page;
409
410 page = shmem_read_mapping_page(mapping, i);
411 if (IS_ERR(page)) {
412 num = i;
413 goto release;
414 }
415
416 sg_set_page(sg, page, PAGE_SIZE, 0);
417 }
418
419 if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0) {
420 num = sgt->nents;
421 goto release;
422 }
423 } else if (dobj->page) {
424 /* Single contiguous page */
425 if (sg_alloc_table(sgt, 1, GFP_KERNEL))
426 goto free_sgt;
427
428 sg_set_page(sgt->sgl, dobj->page, dobj->obj.size, 0);
429
430 if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0)
431 goto free_table;
432 } else if (dobj->linear) {
433 /* Single contiguous physical region - no struct page */
434 if (sg_alloc_table(sgt, 1, GFP_KERNEL))
435 goto free_sgt;
436 sg_dma_address(sgt->sgl) = dobj->dev_addr;
437 sg_dma_len(sgt->sgl) = dobj->obj.size;
438 } else {
439 goto free_sgt;
440 }
441 return sgt;
442
443 release:
444 for_each_sg(sgt->sgl, sg, num, i)
445 put_page(sg_page(sg));
446 free_table:
447 sg_free_table(sgt);
448 free_sgt:
449 kfree(sgt);
450 return NULL;
451}
452
453static void armada_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
454 struct sg_table *sgt, enum dma_data_direction dir)
455{
456 struct drm_gem_object *obj = attach->dmabuf->priv;
457 struct armada_gem_object *dobj = drm_to_armada_gem(obj);
458 int i;
459
460 if (!dobj->linear)
461 dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, dir);
462
463 if (dobj->obj.filp) {
464 struct scatterlist *sg;
465 for_each_sg(sgt->sgl, sg, sgt->nents, i)
466 put_page(sg_page(sg));
467 }
468
469 sg_free_table(sgt);
470 kfree(sgt);
471}
472
473static void *armada_gem_dmabuf_no_kmap(struct dma_buf *buf, unsigned long n)
474{
475 return NULL;
476}
477
478static void
479armada_gem_dmabuf_no_kunmap(struct dma_buf *buf, unsigned long n, void *addr)
480{
481}
482
483static int
484armada_gem_dmabuf_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
485{
486 return -EINVAL;
487}
488
489static const struct dma_buf_ops armada_gem_prime_dmabuf_ops = {
490 .map_dma_buf = armada_gem_prime_map_dma_buf,
491 .unmap_dma_buf = armada_gem_prime_unmap_dma_buf,
492 .release = drm_gem_dmabuf_release,
493 .map_atomic = armada_gem_dmabuf_no_kmap,
494 .unmap_atomic = armada_gem_dmabuf_no_kunmap,
495 .map = armada_gem_dmabuf_no_kmap,
496 .unmap = armada_gem_dmabuf_no_kunmap,
497 .mmap = armada_gem_dmabuf_mmap,
498};
499
500struct dma_buf *
501armada_gem_prime_export(struct drm_device *dev, struct drm_gem_object *obj,
502 int flags)
503{
504 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
505
506 exp_info.ops = &armada_gem_prime_dmabuf_ops;
507 exp_info.size = obj->size;
508 exp_info.flags = O_RDWR;
509 exp_info.priv = obj;
510
511 return drm_gem_dmabuf_export(dev, &exp_info);
512}
513
514struct drm_gem_object *
515armada_gem_prime_import(struct drm_device *dev, struct dma_buf *buf)
516{
517 struct dma_buf_attachment *attach;
518 struct armada_gem_object *dobj;
519
520 if (buf->ops == &armada_gem_prime_dmabuf_ops) {
521 struct drm_gem_object *obj = buf->priv;
522 if (obj->dev == dev) {
523 /*
524 * Importing our own dmabuf(s) increases the
525 * refcount on the gem object itself.
526 */
527 drm_gem_object_get(obj);
528 return obj;
529 }
530 }
531
532 attach = dma_buf_attach(buf, dev->dev);
533 if (IS_ERR(attach))
534 return ERR_CAST(attach);
535
536 dobj = armada_gem_alloc_private_object(dev, buf->size);
537 if (!dobj) {
538 dma_buf_detach(buf, attach);
539 return ERR_PTR(-ENOMEM);
540 }
541
542 dobj->obj.import_attach = attach;
543 get_dma_buf(buf);
544
545 /*
546 * Don't call dma_buf_map_attachment() here - it maps the
547 * scatterlist immediately for DMA, and this is not always
548 * an appropriate thing to do.
549 */
550 return &dobj->obj;
551}
552
553int armada_gem_map_import(struct armada_gem_object *dobj)
554{
555 int ret;
556
557 dobj->sgt = dma_buf_map_attachment(dobj->obj.import_attach,
558 DMA_TO_DEVICE);
559 if (IS_ERR(dobj->sgt)) {
560 ret = PTR_ERR(dobj->sgt);
561 dobj->sgt = NULL;
562 DRM_ERROR("dma_buf_map_attachment() error: %d\n", ret);
563 return ret;
564 }
565 if (dobj->sgt->nents > 1) {
566 DRM_ERROR("dma_buf_map_attachment() returned an (unsupported) scattered list\n");
567 return -EINVAL;
568 }
569 if (sg_dma_len(dobj->sgt->sgl) < dobj->obj.size) {
570 DRM_ERROR("dma_buf_map_attachment() returned a small buffer\n");
571 return -EINVAL;
572 }
573 dobj->dev_addr = sg_dma_address(dobj->sgt->sgl);
574 dobj->mapped = true;
575 return 0;
576}