2 * Copyright (C) 2012 Russell King
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.
8 #include <linux/dma-buf.h>
9 #include <linux/dma-mapping.h>
10 #include <linux/shmem_fs.h>
12 #include "armada_drm.h"
13 #include "armada_gem.h"
14 #include <drm/armada_drm.h>
15 #include "armada_ioctlP.h"
17 static int armada_gem_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
19 struct armada_gem_object *obj = drm_to_armada_gem(vma->vm_private_data);
20 unsigned long addr = (unsigned long)vmf->virtual_address;
21 unsigned long pfn = obj->phys_addr >> PAGE_SHIFT;
24 pfn += (addr - vma->vm_start) >> PAGE_SHIFT;
25 ret = vm_insert_pfn(vma, addr, pfn);
30 return VM_FAULT_NOPAGE;
34 return VM_FAULT_SIGBUS;
38 const struct vm_operations_struct armada_gem_vm_ops = {
39 .fault = armada_gem_vm_fault,
40 .open = drm_gem_vm_open,
41 .close = drm_gem_vm_close,
44 static size_t roundup_gem_size(size_t size)
46 return roundup(size, PAGE_SIZE);
49 void armada_gem_free_object(struct drm_gem_object *obj)
51 struct armada_gem_object *dobj = drm_to_armada_gem(obj);
52 struct armada_private *priv = obj->dev->dev_private;
54 DRM_DEBUG_DRIVER("release obj %p\n", dobj);
56 drm_gem_free_mmap_offset(&dobj->obj);
58 might_lock(&priv->linear_lock);
61 /* page backed memory */
62 unsigned int order = get_order(dobj->obj.size);
63 __free_pages(dobj->page, order);
64 } else if (dobj->linear) {
65 /* linear backed memory */
66 mutex_lock(&priv->linear_lock);
67 drm_mm_remove_node(dobj->linear);
68 mutex_unlock(&priv->linear_lock);
74 if (dobj->obj.import_attach) {
75 /* We only ever display imported data */
77 dma_buf_unmap_attachment(dobj->obj.import_attach,
78 dobj->sgt, DMA_TO_DEVICE);
79 drm_prime_gem_destroy(&dobj->obj, NULL);
82 drm_gem_object_release(&dobj->obj);
88 armada_gem_linear_back(struct drm_device *dev, struct armada_gem_object *obj)
90 struct armada_private *priv = dev->dev_private;
91 size_t size = obj->obj.size;
93 if (obj->page || obj->linear)
97 * If it is a small allocation (typically cursor, which will
98 * be 32x64 or 64x32 ARGB pixels) try to get it from the system.
99 * Framebuffers will never be this small (our minimum size for
100 * framebuffers is larger than this anyway.) Such objects are
101 * only accessed by the CPU so we don't need any special handing
105 unsigned int order = get_order(size);
106 struct page *p = alloc_pages(GFP_KERNEL, order);
109 obj->addr = page_address(p);
110 obj->phys_addr = page_to_phys(p);
113 memset(obj->addr, 0, PAGE_ALIGN(size));
118 * We could grab something from CMA if it's enabled, but that
119 * involves building in a problem:
121 * CMA's interface uses dma_alloc_coherent(), which provides us
122 * with an CPU virtual address and a device address.
124 * The CPU virtual address may be either an address in the kernel
125 * direct mapped region (for example, as it would be on x86) or
126 * it may be remapped into another part of kernel memory space
127 * (eg, as it would be on ARM.) This means virt_to_phys() on the
128 * returned virtual address is invalid depending on the architecture
131 * The device address may also not be a physical address; it may
132 * be that there is some kind of remapping between the device and
133 * system RAM, which makes the use of the device address also
134 * unsafe to re-use as a physical address.
136 * This makes DRM usage of dma_alloc_coherent() in a generic way
137 * at best very questionable and unsafe.
140 /* Otherwise, grab it from our linear allocation */
142 struct drm_mm_node *node;
143 unsigned align = min_t(unsigned, size, SZ_2M);
147 node = kzalloc(sizeof(*node), GFP_KERNEL);
151 mutex_lock(&priv->linear_lock);
152 ret = drm_mm_insert_node(&priv->linear, node, size, align,
153 DRM_MM_SEARCH_DEFAULT);
154 mutex_unlock(&priv->linear_lock);
162 /* Ensure that the memory we're returning is cleared. */
163 ptr = ioremap_wc(obj->linear->start, size);
165 mutex_lock(&priv->linear_lock);
166 drm_mm_remove_node(obj->linear);
167 mutex_unlock(&priv->linear_lock);
173 memset_io(ptr, 0, size);
176 obj->phys_addr = obj->linear->start;
177 obj->dev_addr = obj->linear->start;
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);
188 armada_gem_map_object(struct drm_device *dev, struct armada_gem_object *dobj)
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);
196 struct armada_gem_object *
197 armada_gem_alloc_private_object(struct drm_device *dev, size_t size)
199 struct armada_gem_object *obj;
201 size = roundup_gem_size(size);
203 obj = kzalloc(sizeof(*obj), GFP_KERNEL);
207 drm_gem_private_object_init(dev, &obj->obj, size);
208 obj->dev_addr = DMA_ERROR_CODE;
210 DRM_DEBUG_DRIVER("alloc private obj %p size %zu\n", obj, size);
215 struct armada_gem_object *armada_gem_alloc_object(struct drm_device *dev,
218 struct armada_gem_object *obj;
219 struct address_space *mapping;
221 size = roundup_gem_size(size);
223 obj = kzalloc(sizeof(*obj), GFP_KERNEL);
227 if (drm_gem_object_init(dev, &obj->obj, size)) {
232 obj->dev_addr = DMA_ERROR_CODE;
234 mapping = file_inode(obj->obj.filp)->i_mapping;
235 mapping_set_gfp_mask(mapping, GFP_HIGHUSER | __GFP_RECLAIMABLE);
237 DRM_DEBUG_DRIVER("alloc obj %p size %zu\n", obj, size);
242 /* Dumb alloc support */
243 int armada_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
244 struct drm_mode_create_dumb *args)
246 struct armada_gem_object *dobj;
251 args->pitch = armada_pitch(args->width, args->bpp);
252 args->size = size = args->pitch * args->height;
254 dobj = armada_gem_alloc_private_object(dev, size);
258 ret = armada_gem_linear_back(dev, dobj);
262 ret = drm_gem_handle_create(file, &dobj->obj, &handle);
266 args->handle = handle;
268 /* drop reference from allocate - handle holds it now */
269 DRM_DEBUG_DRIVER("obj %p size %zu handle %#x\n", dobj, size, handle);
271 drm_gem_object_unreference_unlocked(&dobj->obj);
275 int armada_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
276 uint32_t handle, uint64_t *offset)
278 struct armada_gem_object *obj;
281 obj = armada_gem_object_lookup(dev, file, handle);
283 DRM_ERROR("failed to lookup gem object\n");
287 /* Don't allow imported objects to be mapped */
288 if (obj->obj.import_attach) {
293 ret = drm_gem_create_mmap_offset(&obj->obj);
295 *offset = drm_vma_node_offset_addr(&obj->obj.vma_node);
296 DRM_DEBUG_DRIVER("handle %#x offset %llx\n", handle, *offset);
300 drm_gem_object_unreference_unlocked(&obj->obj);
305 int armada_gem_dumb_destroy(struct drm_file *file, struct drm_device *dev,
308 return drm_gem_handle_delete(file, handle);
311 /* Private driver gem ioctls */
312 int armada_gem_create_ioctl(struct drm_device *dev, void *data,
313 struct drm_file *file)
315 struct drm_armada_gem_create *args = data;
316 struct armada_gem_object *dobj;
326 dobj = armada_gem_alloc_object(dev, size);
330 ret = drm_gem_handle_create(file, &dobj->obj, &handle);
334 args->handle = handle;
336 /* drop reference from allocate - handle holds it now */
337 DRM_DEBUG_DRIVER("obj %p size %zu handle %#x\n", dobj, size, handle);
339 drm_gem_object_unreference_unlocked(&dobj->obj);
343 /* Map a shmem-backed object into process memory space */
344 int armada_gem_mmap_ioctl(struct drm_device *dev, void *data,
345 struct drm_file *file)
347 struct drm_armada_gem_mmap *args = data;
348 struct armada_gem_object *dobj;
351 dobj = armada_gem_object_lookup(dev, file, args->handle);
355 if (!dobj->obj.filp) {
356 drm_gem_object_unreference_unlocked(&dobj->obj);
360 addr = vm_mmap(dobj->obj.filp, 0, args->size, PROT_READ | PROT_WRITE,
361 MAP_SHARED, args->offset);
362 drm_gem_object_unreference_unlocked(&dobj->obj);
363 if (IS_ERR_VALUE(addr))
371 int armada_gem_pwrite_ioctl(struct drm_device *dev, void *data,
372 struct drm_file *file)
374 struct drm_armada_gem_pwrite *args = data;
375 struct armada_gem_object *dobj;
379 DRM_DEBUG_DRIVER("handle %u off %u size %u ptr 0x%llx\n",
380 args->handle, args->offset, args->size, args->ptr);
385 ptr = (char __user *)(uintptr_t)args->ptr;
387 if (!access_ok(VERIFY_READ, ptr, args->size))
390 ret = fault_in_multipages_readable(ptr, args->size);
394 dobj = armada_gem_object_lookup(dev, file, args->handle);
398 /* Must be a kernel-mapped object */
402 if (args->offset > dobj->obj.size ||
403 args->size > dobj->obj.size - args->offset) {
404 DRM_ERROR("invalid size: object size %u\n", dobj->obj.size);
409 if (copy_from_user(dobj->addr + args->offset, ptr, args->size)) {
411 } else if (dobj->update) {
412 dobj->update(dobj->update_data);
417 drm_gem_object_unreference_unlocked(&dobj->obj);
423 armada_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
424 enum dma_data_direction dir)
426 struct drm_gem_object *obj = attach->dmabuf->priv;
427 struct armada_gem_object *dobj = drm_to_armada_gem(obj);
428 struct scatterlist *sg;
429 struct sg_table *sgt;
432 sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
436 if (dobj->obj.filp) {
437 struct address_space *mapping;
440 count = dobj->obj.size / PAGE_SIZE;
441 if (sg_alloc_table(sgt, count, GFP_KERNEL))
444 mapping = file_inode(dobj->obj.filp)->i_mapping;
446 for_each_sg(sgt->sgl, sg, count, i) {
449 page = shmem_read_mapping_page(mapping, i);
455 sg_set_page(sg, page, PAGE_SIZE, 0);
458 if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0) {
462 } else if (dobj->page) {
463 /* Single contiguous page */
464 if (sg_alloc_table(sgt, 1, GFP_KERNEL))
467 sg_set_page(sgt->sgl, dobj->page, dobj->obj.size, 0);
469 if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0)
471 } else if (dobj->linear) {
472 /* Single contiguous physical region - no struct page */
473 if (sg_alloc_table(sgt, 1, GFP_KERNEL))
475 sg_dma_address(sgt->sgl) = dobj->dev_addr;
476 sg_dma_len(sgt->sgl) = dobj->obj.size;
483 for_each_sg(sgt->sgl, sg, num, i)
484 page_cache_release(sg_page(sg));
492 static void armada_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
493 struct sg_table *sgt, enum dma_data_direction dir)
495 struct drm_gem_object *obj = attach->dmabuf->priv;
496 struct armada_gem_object *dobj = drm_to_armada_gem(obj);
500 dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, dir);
502 if (dobj->obj.filp) {
503 struct scatterlist *sg;
504 for_each_sg(sgt->sgl, sg, sgt->nents, i)
505 page_cache_release(sg_page(sg));
512 static void *armada_gem_dmabuf_no_kmap(struct dma_buf *buf, unsigned long n)
518 armada_gem_dmabuf_no_kunmap(struct dma_buf *buf, unsigned long n, void *addr)
523 armada_gem_dmabuf_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
528 static const struct dma_buf_ops armada_gem_prime_dmabuf_ops = {
529 .map_dma_buf = armada_gem_prime_map_dma_buf,
530 .unmap_dma_buf = armada_gem_prime_unmap_dma_buf,
531 .release = drm_gem_dmabuf_release,
532 .kmap_atomic = armada_gem_dmabuf_no_kmap,
533 .kunmap_atomic = armada_gem_dmabuf_no_kunmap,
534 .kmap = armada_gem_dmabuf_no_kmap,
535 .kunmap = armada_gem_dmabuf_no_kunmap,
536 .mmap = armada_gem_dmabuf_mmap,
540 armada_gem_prime_export(struct drm_device *dev, struct drm_gem_object *obj,
543 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
545 exp_info.ops = &armada_gem_prime_dmabuf_ops;
546 exp_info.size = obj->size;
547 exp_info.flags = O_RDWR;
550 return dma_buf_export(&exp_info);
553 struct drm_gem_object *
554 armada_gem_prime_import(struct drm_device *dev, struct dma_buf *buf)
556 struct dma_buf_attachment *attach;
557 struct armada_gem_object *dobj;
559 if (buf->ops == &armada_gem_prime_dmabuf_ops) {
560 struct drm_gem_object *obj = buf->priv;
561 if (obj->dev == dev) {
563 * Importing our own dmabuf(s) increases the
564 * refcount on the gem object itself.
566 drm_gem_object_reference(obj);
571 attach = dma_buf_attach(buf, dev->dev);
573 return ERR_CAST(attach);
575 dobj = armada_gem_alloc_private_object(dev, buf->size);
577 dma_buf_detach(buf, attach);
578 return ERR_PTR(-ENOMEM);
581 dobj->obj.import_attach = attach;
585 * Don't call dma_buf_map_attachment() here - it maps the
586 * scatterlist immediately for DMA, and this is not always
587 * an appropriate thing to do.
592 int armada_gem_map_import(struct armada_gem_object *dobj)
596 dobj->sgt = dma_buf_map_attachment(dobj->obj.import_attach,
599 DRM_ERROR("dma_buf_map_attachment() returned NULL\n");
602 if (IS_ERR(dobj->sgt)) {
603 ret = PTR_ERR(dobj->sgt);
605 DRM_ERROR("dma_buf_map_attachment() error: %d\n", ret);
608 if (dobj->sgt->nents > 1) {
609 DRM_ERROR("dma_buf_map_attachment() returned an (unsupported) scattered list\n");
612 if (sg_dma_len(dobj->sgt->sgl) < dobj->obj.size) {
613 DRM_ERROR("dma_buf_map_attachment() returned a small buffer\n");
616 dobj->dev_addr = sg_dma_address(dobj->sgt->sgl);