Release 4.11 drivers/gpu/drm/exynos/exynos_drm_gem.c

/* exynos_drm_gem.c
 *
 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
 * Author: Inki Dae <inki.dae@samsung.com>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <drm/drmP.h>
#include <drm/drm_vma_manager.h>

#include <linux/shmem_fs.h>
#include <linux/dma-buf.h>
#include <linux/pfn_t.h>
#include <drm/exynos_drm.h>

#include "exynos_drm_drv.h"
#include "exynos_drm_gem.h"
#include "exynos_drm_iommu.h"



static int exynos_drm_alloc_buf(struct exynos_drm_gem *exynos_gem)
{
	struct drm_device *dev = exynos_gem->base.dev;
	unsigned long attr;
	unsigned int nr_pages;
	struct sg_table sgt;
	int ret = -ENOMEM;

	if (exynos_gem->dma_addr) {
		DRM_DEBUG_KMS("already allocated.\n");
		return 0;
	}

	exynos_gem->dma_attrs = 0;

	/*
         * if EXYNOS_BO_CONTIG, fully physically contiguous memory
         * region will be allocated else physically contiguous
         * as possible.
         */
	if (!(exynos_gem->flags & EXYNOS_BO_NONCONTIG))
		exynos_gem->dma_attrs |= DMA_ATTR_FORCE_CONTIGUOUS;

	/*
         * if EXYNOS_BO_WC or EXYNOS_BO_NONCACHABLE, writecombine mapping
         * else cachable mapping.
         */
	if (exynos_gem->flags & EXYNOS_BO_WC ||
			!(exynos_gem->flags & EXYNOS_BO_CACHABLE))
		attr = DMA_ATTR_WRITE_COMBINE;
	else
		attr = DMA_ATTR_NON_CONSISTENT;

	exynos_gem->dma_attrs |= attr;
	exynos_gem->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;

	nr_pages = exynos_gem->size >> PAGE_SHIFT;

	exynos_gem->pages = drm_calloc_large(nr_pages, sizeof(struct page *));
	if (!exynos_gem->pages) {
		DRM_ERROR("failed to allocate pages.\n");
		return -ENOMEM;
	}

	exynos_gem->cookie = dma_alloc_attrs(to_dma_dev(dev), exynos_gem->size,
					     &exynos_gem->dma_addr, GFP_KERNEL,
					     exynos_gem->dma_attrs);
	if (!exynos_gem->cookie) {
		DRM_ERROR("failed to allocate buffer.\n");
		goto err_free;
	}

	ret = dma_get_sgtable_attrs(to_dma_dev(dev), &sgt, exynos_gem->cookie,
				    exynos_gem->dma_addr, exynos_gem->size,
				    exynos_gem->dma_attrs);
	if (ret < 0) {
		DRM_ERROR("failed to get sgtable.\n");
		goto err_dma_free;
	}

	if (drm_prime_sg_to_page_addr_arrays(&sgt, exynos_gem->pages, NULL,
					     nr_pages)) {
		DRM_ERROR("invalid sgtable.\n");
		ret = -EINVAL;
		goto err_sgt_free;
	}

	sg_free_table(&sgt);

	DRM_DEBUG_KMS("dma_addr(0x%lx), size(0x%lx)\n",
			(unsigned long)exynos_gem->dma_addr, exynos_gem->size);

	return 0;

err_sgt_free:
	sg_free_table(&sgt);
err_dma_free:
	dma_free_attrs(to_dma_dev(dev), exynos_gem->size, exynos_gem->cookie,
		       exynos_gem->dma_addr, exynos_gem->dma_attrs);
err_free:
	drm_free_large(exynos_gem->pages);

	return ret;
}

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Joonyoung Shim
221
62.61%
4
57.14%
Marek Szyprowski
122
34.56%
2
28.57%
Krzysztof Kozlowski
10
2.83%
1
14.29%
Total
353
100.00%
7
100.00%



static void exynos_drm_free_buf(struct exynos_drm_gem *exynos_gem)
{
	struct drm_device *dev = exynos_gem->base.dev;

	if (!exynos_gem->dma_addr) {
		DRM_DEBUG_KMS("dma_addr is invalid.\n");
		return;
	}

	DRM_DEBUG_KMS("dma_addr(0x%lx), size(0x%lx)\n",
			(unsigned long)exynos_gem->dma_addr, exynos_gem->size);

	dma_free_attrs(to_dma_dev(dev), exynos_gem->size, exynos_gem->cookie,
			(dma_addr_t)exynos_gem->dma_addr,
			exynos_gem->dma_attrs);

	drm_free_large(exynos_gem->pages);
}

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Joonyoung Shim
85
96.59%
3
75.00%
Marek Szyprowski
3
3.41%
1
25.00%
Total
88
100.00%
4
100.00%



static int exynos_drm_gem_handle_create(struct drm_gem_object *obj,
					struct drm_file *file_priv,
					unsigned int *handle)
{
	int ret;

	/*
         * allocate a id of idr table where the obj is registered
         * and handle has the id what user can see.
         */
	ret = drm_gem_handle_create(file_priv, obj, handle);
	if (ret)
		return ret;

	DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle);

	/* drop reference from allocate - handle holds it now. */
	drm_gem_object_unreference_unlocked(obj);

	return 0;
}

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Joonyoung Shim
46
76.67%
1
33.33%
Inki Dae
14
23.33%
2
66.67%
Total
60
100.00%
3
100.00%



void exynos_drm_gem_destroy(struct exynos_drm_gem *exynos_gem)
{
	struct drm_gem_object *obj = &exynos_gem->base;

	DRM_DEBUG_KMS("handle count = %d\n", obj->handle_count);

	/*
         * do not release memory region from exporter.
         *
         * the region will be released by exporter
         * once dmabuf's refcount becomes 0.
         */
	if (obj->import_attach)
		drm_prime_gem_destroy(obj, exynos_gem->sgt);
	else
		exynos_drm_free_buf(exynos_gem);

	/* release file pointer to gem object. */
	drm_gem_object_release(obj);

	kfree(exynos_gem);
}

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Joonyoung Shim
51
82.26%
4
66.67%
Inki Dae
11
17.74%
2
33.33%
Total
62
100.00%
6
100.00%



unsigned long exynos_drm_gem_get_size(struct drm_device *dev,
						unsigned int gem_handle,
						struct drm_file *file_priv)
{
	struct exynos_drm_gem *exynos_gem;
	struct drm_gem_object *obj;

	obj = drm_gem_object_lookup(file_priv, gem_handle);
	if (!obj) {
		DRM_ERROR("failed to lookup gem object.\n");
		return 0;
	}

	exynos_gem = to_exynos_gem(obj);

	drm_gem_object_unreference_unlocked(obj);

	return exynos_gem->size;
}

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Inki Dae
66
92.96%
1
50.00%
Joonyoung Shim
5
7.04%
1
50.00%
Total
71
100.00%
2
100.00%



static struct exynos_drm_gem *exynos_drm_gem_init(struct drm_device *dev,
						  unsigned long size)
{
	struct exynos_drm_gem *exynos_gem;
	struct drm_gem_object *obj;
	int ret;

	exynos_gem = kzalloc(sizeof(*exynos_gem), GFP_KERNEL);
	if (!exynos_gem)
		return ERR_PTR(-ENOMEM);

	exynos_gem->size = size;
	obj = &exynos_gem->base;

	ret = drm_gem_object_init(dev, obj, size);
	if (ret < 0) {
		DRM_ERROR("failed to initialize gem object\n");
		kfree(exynos_gem);
		return ERR_PTR(ret);
	}

	ret = drm_gem_create_mmap_offset(obj);
	if (ret < 0) {
		drm_gem_object_release(obj);
		kfree(exynos_gem);
		return ERR_PTR(ret);
	}

	DRM_DEBUG_KMS("created file object = %pK\n", obj->filp);

	return exynos_gem;
}

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Inki Dae
78
53.42%
3
33.33%
Joonyoung Shim
67
45.89%
5
55.56%
Krzysztof Kozlowski
1
0.68%
1
11.11%
Total
146
100.00%
9
100.00%



struct exynos_drm_gem *exynos_drm_gem_create(struct drm_device *dev,
					     unsigned int flags,
					     unsigned long size)
{
	struct exynos_drm_gem *exynos_gem;
	int ret;

	if (flags & ~(EXYNOS_BO_MASK)) {
		DRM_ERROR("invalid GEM buffer flags: %u\n", flags);
		return ERR_PTR(-EINVAL);
	}

	if (!size) {
		DRM_ERROR("invalid GEM buffer size: %lu\n", size);
		return ERR_PTR(-EINVAL);
	}

	size = roundup(size, PAGE_SIZE);

	exynos_gem = exynos_drm_gem_init(dev, size);
	if (IS_ERR(exynos_gem))
		return exynos_gem;

	/* set memory type and cache attribute from user side. */
	exynos_gem->flags = flags;

	ret = exynos_drm_alloc_buf(exynos_gem);
	if (ret < 0) {
		drm_gem_object_release(&exynos_gem->base);
		kfree(exynos_gem);
		return ERR_PTR(ret);
	}

	return exynos_gem;
}

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Inki Dae
92
63.01%
4
36.36%
Joonyoung Shim
44
30.14%
5
45.45%
Shuah Khan
6
4.11%
1
9.09%
YoungJun Cho
4
2.74%
1
9.09%
Total
146
100.00%
11
100.00%



int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
				struct drm_file *file_priv)
{
	struct drm_exynos_gem_create *args = data;
	struct exynos_drm_gem *exynos_gem;
	int ret;

	exynos_gem = exynos_drm_gem_create(dev, args->flags, args->size);
	if (IS_ERR(exynos_gem))
		return PTR_ERR(exynos_gem);

	ret = exynos_drm_gem_handle_create(&exynos_gem->base, file_priv,
					   &args->handle);
	if (ret) {
		exynos_drm_gem_destroy(exynos_gem);
		return ret;
	}

	return 0;
}

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Inki Dae
57
59.38%
3
60.00%
Joonyoung Shim
39
40.62%
2
40.00%
Total
96
100.00%
5
100.00%



int exynos_drm_gem_map_ioctl(struct drm_device *dev, void *data,
			     struct drm_file *file_priv)
{
	struct drm_exynos_gem_map *args = data;

	return exynos_drm_gem_dumb_map_offset(file_priv, dev, args->handle,
					      &args->offset);
}

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43
100.00%
1
100.00%



dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
					unsigned int gem_handle,
					struct drm_file *filp)
{
	struct exynos_drm_gem *exynos_gem;
	struct drm_gem_object *obj;

	obj = drm_gem_object_lookup(filp, gem_handle);
	if (!obj) {
		DRM_ERROR("failed to lookup gem object.\n");
		return ERR_PTR(-EINVAL);
	}

	exynos_gem = to_exynos_gem(obj);

	return &exynos_gem->dma_addr;
}

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Inki Dae
66
92.96%
2
66.67%
Joonyoung Shim
5
7.04%
1
33.33%
Total
71
100.00%
3
100.00%



void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
					unsigned int gem_handle,
					struct drm_file *filp)
{
	struct drm_gem_object *obj;

	obj = drm_gem_object_lookup(filp, gem_handle);
	if (!obj) {
		DRM_ERROR("failed to lookup gem object.\n");
		return;
	}

	drm_gem_object_unreference_unlocked(obj);

	/*
         * decrease obj->refcount one more time because we has already
         * increased it at exynos_drm_gem_get_dma_addr().
         */
	drm_gem_object_unreference_unlocked(obj);
}

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57
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2
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57
100.00%
2
100.00%



static int exynos_drm_gem_mmap_buffer(struct exynos_drm_gem *exynos_gem,
				      struct vm_area_struct *vma)
{
	struct drm_device *drm_dev = exynos_gem->base.dev;
	unsigned long vm_size;
	int ret;

	vma->vm_flags &= ~VM_PFNMAP;
	vma->vm_pgoff = 0;

	vm_size = vma->vm_end - vma->vm_start;

	/* check if user-requested size is valid. */
	if (vm_size > exynos_gem->size)
		return -EINVAL;

	ret = dma_mmap_attrs(to_dma_dev(drm_dev), vma, exynos_gem->cookie,
			     exynos_gem->dma_addr, exynos_gem->size,
			     exynos_gem->dma_attrs);
	if (ret < 0) {
		DRM_ERROR("failed to mmap.\n");
		return ret;
	}

	return 0;
}

Contributors
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Inki Dae
104
88.89%
6
60.00%
Joonyoung Shim
8
6.84%
1
10.00%
Marek Szyprowski
4
3.42%
2
20.00%
Krzysztof Kozlowski
1
0.85%
1
10.00%
Total
117
100.00%
10
100.00%



int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
				      struct drm_file *file_priv)
{
	struct exynos_drm_gem *exynos_gem;
	struct drm_exynos_gem_info *args = data;
	struct drm_gem_object *obj;

	obj = drm_gem_object_lookup(file_priv, args->handle);
	if (!obj) {
		DRM_ERROR("failed to lookup gem object.\n");
		return -EINVAL;
	}

	exynos_gem = to_exynos_gem(obj);

	args->flags = exynos_gem->flags;
	args->size = exynos_gem->size;

	drm_gem_object_unreference_unlocked(obj);

	return 0;
}

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Inki Dae
87
92.55%
1
33.33%
Joonyoung Shim
6
6.38%
1
33.33%
Daniel Vetter
1
1.06%
1
33.33%
Total
94
100.00%
3
100.00%



void exynos_drm_gem_free_object(struct drm_gem_object *obj)
{
	exynos_drm_gem_destroy(to_exynos_gem(obj));
}

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Inki Dae
14
77.78%
1
25.00%
Joonyoung Shim
4
22.22%
3
75.00%
Total
18
100.00%
4
100.00%



int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
			       struct drm_device *dev,
			       struct drm_mode_create_dumb *args)
{
	struct exynos_drm_gem *exynos_gem;
	unsigned int flags;
	int ret;

	/*
         * allocate memory to be used for framebuffer.
         * - this callback would be called by user application
         *      with DRM_IOCTL_MODE_CREATE_DUMB command.
         */

	args->pitch = args->width * ((args->bpp + 7) / 8);
	args->size = args->pitch * args->height;

	if (is_drm_iommu_supported(dev))
		flags = EXYNOS_BO_NONCONTIG | EXYNOS_BO_WC;
	else
		flags = EXYNOS_BO_CONTIG | EXYNOS_BO_WC;

	exynos_gem = exynos_drm_gem_create(dev, flags, args->size);
	if (IS_ERR(exynos_gem)) {
		dev_warn(dev->dev, "FB allocation failed.\n");
		return PTR_ERR(exynos_gem);
	}

	ret = exynos_drm_gem_handle_create(&exynos_gem->base, file_priv,
					   &args->handle);
	if (ret) {
		exynos_drm_gem_destroy(exynos_gem);
		return ret;
	}

	return 0;
}

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Inki Dae
65
41.67%
2
22.22%
Joonyoung Shim
51
32.69%
3
33.33%
Rahul Sharma
20
12.82%
1
11.11%
Vikas Sajjan
11
7.05%
1
11.11%
Cooper Yuan
8
5.13%
1
11.11%
Masanari Iida
1
0.64%
1
11.11%
Total
156
100.00%
9
100.00%



int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv,
				   struct drm_device *dev, uint32_t handle,
				   uint64_t *offset)
{
	struct drm_gem_object *obj;
	int ret = 0;

	/*
         * get offset of memory allocated for drm framebuffer.
         * - this callback would be called by user application
         *      with DRM_IOCTL_MODE_MAP_DUMB command.
         */

	obj = drm_gem_object_lookup(file_priv, handle);
	if (!obj) {
		DRM_ERROR("failed to lookup gem object.\n");
		return -EINVAL;
	}

	*offset = drm_vma_node_offset_addr(&obj->vma_node);
	DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset);

	drm_gem_object_unreference_unlocked(obj);
	return ret;
}

Contributors
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Inki Dae
66
74.16%
1
20.00%
Joonyoung Shim
14
15.73%
1
20.00%
David Herrmann
5
5.62%
1
20.00%
Daniel Vetter
3
3.37%
1
20.00%
Laurent Pinchart
1
1.12%
1
20.00%
Total
89
100.00%
5
100.00%



int exynos_drm_gem_fault(struct vm_fault *vmf)
{
	struct vm_area_struct *vma = vmf->vma;
	struct drm_gem_object *obj = vma->vm_private_data;
	struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
	unsigned long pfn;
	pgoff_t page_offset;
	int ret;

	page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;

	if (page_offset >= (exynos_gem->size >> PAGE_SHIFT)) {
		DRM_ERROR("invalid page offset\n");
		ret = -EINVAL;
		goto out;
	}

	pfn = page_to_pfn(exynos_gem->pages[page_offset]);
	ret = vm_insert_mixed(vma, vmf->address, __pfn_to_pfn_t(pfn, PFN_DEV));

out:
	switch (ret) {
	case 0:
	case -ERESTARTSYS:
	case -EINTR:
		return VM_FAULT_NOPAGE;
	case -ENOMEM:
		return VM_FAULT_OOM;
	default:
		return VM_FAULT_SIGBUS;
	}
}

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Joonyoung Shim
80
52.63%
3
37.50%
Inki Dae
56
36.84%
2
25.00%
Dave Jiang
9
5.92%
1
12.50%
Dan J Williams
5
3.29%
1
12.50%
Jan Kara
2
1.32%
1
12.50%
Total
152
100.00%
8
100.00%



static int exynos_drm_gem_mmap_obj(struct drm_gem_object *obj,
				   struct vm_area_struct *vma)
{
	struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
	int ret;

	DRM_DEBUG_KMS("flags = 0x%x\n", exynos_gem->flags);

	/* non-cachable as default. */
	if (exynos_gem->flags & EXYNOS_BO_CACHABLE)
		vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
	else if (exynos_gem->flags & EXYNOS_BO_WC)
		vma->vm_page_prot =
			pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
	else
		vma->vm_page_prot =
			pgprot_noncached(vm_get_page_prot(vma->vm_flags));

	ret = exynos_drm_gem_mmap_buffer(exynos_gem, vma);
	if (ret)
		goto err_close_vm;

	return ret;

err_close_vm:
	drm_gem_vm_close(vma);

	return ret;
}

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Joonyoung Shim
73
58.40%
3
50.00%
Inki Dae
52
41.60%
3
50.00%
Total
125
100.00%
6
100.00%



int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
{
	struct drm_gem_object *obj;
	int ret;

	/* set vm_area_struct. */
	ret = drm_gem_mmap(filp, vma);
	if (ret < 0) {
		DRM_ERROR("failed to mmap.\n");
		return ret;
	}

	obj = vma->vm_private_data;

	if (obj->import_attach)
		return dma_buf_mmap(obj->dma_buf, vma, 0);

	return exynos_drm_gem_mmap_obj(obj, vma);
}

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81
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2
100.00%

/* low-level interface prime helpers */


struct sg_table *exynos_drm_gem_prime_get_sg_table(struct drm_gem_object *obj)
{
	struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
	int npages;

	npages = exynos_gem->size >> PAGE_SHIFT;

	return drm_prime_pages_to_sg(exynos_gem->pages, npages);
}

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43
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struct drm_gem_object *

exynos_drm_gem_prime_import_sg_table(struct drm_device *dev,
				     struct dma_buf_attachment *attach,
				     struct sg_table *sgt)
{
	struct exynos_drm_gem *exynos_gem;
	int npages;
	int ret;

	exynos_gem = exynos_drm_gem_init(dev, attach->dmabuf->size);
	if (IS_ERR(exynos_gem)) {
		ret = PTR_ERR(exynos_gem);
		return ERR_PTR(ret);
	}

	exynos_gem->dma_addr = sg_dma_address(sgt->sgl);

	npages = exynos_gem->size >> PAGE_SHIFT;
	exynos_gem->pages = drm_malloc_ab(npages, sizeof(struct page *));
	if (!exynos_gem->pages) {
		ret = -ENOMEM;
		goto err;
	}

	ret = drm_prime_sg_to_page_addr_arrays(sgt, exynos_gem->pages, NULL,
					       npages);
	if (ret < 0)
		goto err_free_large;

	exynos_gem->sgt = sgt;

	if (sgt->nents == 1) {
		/* always physically continuous memory if sgt->nents is 1. */
		exynos_gem->flags |= EXYNOS_BO_CONTIG;
	} else {
		/*
                 * this case could be CONTIG or NONCONTIG type but for now
                 * sets NONCONTIG.
                 * TODO. we have to find a way that exporter can notify
                 * the type of its own buffer to importer.
                 */
		exynos_gem->flags |= EXYNOS_BO_NONCONTIG;
	}

	return &exynos_gem->base;

err_free_large:
	drm_free_large(exynos_gem->pages);
err:
	drm_gem_object_release(&exynos_gem->base);
	kfree(exynos_gem);
	return ERR_PTR(ret);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Joonyoung Shim
207
97.18%
4
80.00%
Inki Dae
6
2.82%
1
20.00%
Total
213
100.00%
5
100.00%



void *exynos_drm_gem_prime_vmap(struct drm_gem_object *obj)
{
	return NULL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Joonyoung Shim
14
100.00%
1
100.00%
Total
14
100.00%
1
100.00%



void exynos_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
{
	/* Nothing to do */
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Joonyoung Shim
15
100.00%
1
100.00%
Total
15
100.00%
1
100.00%



int exynos_drm_gem_prime_mmap(struct drm_gem_object *obj,
			      struct vm_area_struct *vma)
{
	int ret;

	ret = drm_gem_mmap_obj(obj, obj->size, vma);
	if (ret < 0)
		return ret;

	return exynos_drm_gem_mmap_obj(obj, vma);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Joonyoung Shim
48
100.00%
1
100.00%
Total
48
100.00%
1
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Joonyoung Shim
1254
52.53%
20
35.09%
Inki Dae
908
38.04%
17
29.82%
Marek Szyprowski
129
5.40%
3
5.26%
Rahul Sharma
20
0.84%
1
1.75%
Krzysztof Kozlowski
12
0.50%
3
5.26%
Vikas Sajjan
12
0.50%
1
1.75%
Dave Jiang
9
0.38%
1
1.75%
Dan J Williams
8
0.34%
1
1.75%
David Herrmann
8
0.34%
1
1.75%
Cooper Yuan
8
0.34%
1
1.75%
Shuah Khan
6
0.25%
1
1.75%
YoungJun Cho
4
0.17%
1
1.75%
Daniel Vetter
4
0.17%
2
3.51%
Jan Kara
2
0.08%
1
1.75%
David Howells
1
0.04%
1
1.75%
Masanari Iida
1
0.04%
1
1.75%
Laurent Pinchart
1
0.04%
1
1.75%
Total
2387
100.00%
57
100.00%
Directory: drivers/gpu/drm/exynos

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