1 files changed, 0 insertions, 681 deletions

diff --git a/drivers/media/v4l2-core/videobuf-dma-sg.c b/drivers/media/v4l2-core/videobuf-dma-sg.c
deleted file mode 100644
index 405b89ea1054..000000000000
--- a/drivers/media/v4l2-core/videobuf-dma-sg.c
+++ /dev/null
@@ -1,681 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * helper functions for SG DMA video4linux capture buffers
- *
- * The functions expect the hardware being able to scatter gather
- * (i.e. the buffers are not linear in physical memory, but fragmented
- * into PAGE_SIZE chunks).  They also assume the driver does not need
- * to touch the video data.
- *
- * (c) 2007 Mauro Carvalho Chehab, <mchehab@kernel.org>
- *
- * Highly based on video-buf written originally by:
- * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org>
- * (c) 2006 Mauro Carvalho Chehab, <mchehab@kernel.org>
- * (c) 2006 Ted Walther and John Sokol
- */
-
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/sched/mm.h>
-#include <linux/slab.h>
-#include <linux/interrupt.h>
-#include <linux/pgtable.h>
-
-#include <linux/dma-mapping.h>
-#include <linux/vmalloc.h>
-#include <linux/pagemap.h>
-#include <linux/scatterlist.h>
-#include <asm/page.h>
-
-#include <media/videobuf-dma-sg.h>
-
-#define MAGIC_DMABUF 0x19721112
-#define MAGIC_SG_MEM 0x17890714
-
-#define MAGIC_CHECK(is, should)						\
-	if (unlikely((is) != (should))) {				\
-		printk(KERN_ERR "magic mismatch: %x (expected %x)\n",	\
-				is, should);				\
-		BUG();							\
-	}
-
-static int debug;
-module_param(debug, int, 0644);
-
-MODULE_DESCRIPTION("helper module to manage video4linux dma sg buffers");
-MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@kernel.org>");
-MODULE_LICENSE("GPL");
-
-#define dprintk(level, fmt, arg...)					\
-	if (debug >= level)						\
-		printk(KERN_DEBUG "vbuf-sg: " fmt , ## arg)
-
-/* --------------------------------------------------------------------- */
-
-/*
- * Return a scatterlist for some page-aligned vmalloc()'ed memory
- * block (NULL on errors).  Memory for the scatterlist is allocated
- * using kmalloc.  The caller must free the memory.
- */
-static struct scatterlist *videobuf_vmalloc_to_sg(unsigned char *virt,
-						  int nr_pages)
-{
-	struct scatterlist *sglist;
-	struct page *pg;
-	int i;
-
-	sglist = vzalloc(array_size(nr_pages, sizeof(*sglist)));
-	if (NULL == sglist)
-		return NULL;
-	sg_init_table(sglist, nr_pages);
-	for (i = 0; i < nr_pages; i++, virt += PAGE_SIZE) {
-		pg = vmalloc_to_page(virt);
-		if (NULL == pg)
-			goto err;
-		BUG_ON(PageHighMem(pg));
-		sg_set_page(&sglist[i], pg, PAGE_SIZE, 0);
-	}
-	return sglist;
-
-err:
-	vfree(sglist);
-	return NULL;
-}
-
-/*
- * Return a scatterlist for a an array of userpages (NULL on errors).
- * Memory for the scatterlist is allocated using kmalloc.  The caller
- * must free the memory.
- */
-static struct scatterlist *videobuf_pages_to_sg(struct page **pages,
-					int nr_pages, int offset, size_t size)
-{
-	struct scatterlist *sglist;
-	int i;
-
-	if (NULL == pages[0])
-		return NULL;
-	sglist = vmalloc(array_size(nr_pages, sizeof(*sglist)));
-	if (NULL == sglist)
-		return NULL;
-	sg_init_table(sglist, nr_pages);
-
-	if (PageHighMem(pages[0]))
-		/* DMA to highmem pages might not work */
-		goto highmem;
-	sg_set_page(&sglist[0], pages[0],
-			min_t(size_t, PAGE_SIZE - offset, size), offset);
-	size -= min_t(size_t, PAGE_SIZE - offset, size);
-	for (i = 1; i < nr_pages; i++) {
-		if (NULL == pages[i])
-			goto nopage;
-		if (PageHighMem(pages[i]))
-			goto highmem;
-		sg_set_page(&sglist[i], pages[i], min_t(size_t, PAGE_SIZE, size), 0);
-		size -= min_t(size_t, PAGE_SIZE, size);
-	}
-	return sglist;
-
-nopage:
-	dprintk(2, "sgl: oops - no page\n");
-	vfree(sglist);
-	return NULL;
-
-highmem:
-	dprintk(2, "sgl: oops - highmem page\n");
-	vfree(sglist);
-	return NULL;
-}
-
-/* --------------------------------------------------------------------- */
-
-struct videobuf_dmabuf *videobuf_to_dma(struct videobuf_buffer *buf)
-{
-	struct videobuf_dma_sg_memory *mem = buf->priv;
-	BUG_ON(!mem);
-
-	MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
-
-	return &mem->dma;
-}
-EXPORT_SYMBOL_GPL(videobuf_to_dma);
-
-static void videobuf_dma_init(struct videobuf_dmabuf *dma)
-{
-	memset(dma, 0, sizeof(*dma));
-	dma->magic = MAGIC_DMABUF;
-}
-
-static int videobuf_dma_init_user_locked(struct videobuf_dmabuf *dma,
-			int direction, unsigned long data, unsigned long size)
-{
-	unsigned int gup_flags = FOLL_LONGTERM;
-	unsigned long first, last;
-	int err;
-
-	dma->direction = direction;
-	switch (dma->direction) {
-	case DMA_FROM_DEVICE:
-		gup_flags |= FOLL_WRITE;
-		break;
-	case DMA_TO_DEVICE:
-		break;
-	default:
-		BUG();
-	}
-
-	first = (data          & PAGE_MASK) >> PAGE_SHIFT;
-	last  = ((data+size-1) & PAGE_MASK) >> PAGE_SHIFT;
-	dma->offset = data & ~PAGE_MASK;
-	dma->size = size;
-	dma->nr_pages = last-first+1;
-	dma->pages = kmalloc_array(dma->nr_pages, sizeof(struct page *),
-				   GFP_KERNEL);
-	if (NULL == dma->pages)
-		return -ENOMEM;
-
-	dprintk(1, "init user [0x%lx+0x%lx => %lu pages]\n",
-		data, size, dma->nr_pages);
-
-	err = pin_user_pages(data & PAGE_MASK, dma->nr_pages, gup_flags,
-			     dma->pages);
-
-	if (err != dma->nr_pages) {
-		dma->nr_pages = (err >= 0) ? err : 0;
-		dprintk(1, "pin_user_pages: err=%d [%lu]\n", err,
-			dma->nr_pages);
-		return err < 0 ? err : -EINVAL;
-	}
-	return 0;
-}
-
-static int videobuf_dma_init_user(struct videobuf_dmabuf *dma, int direction,
-			   unsigned long data, unsigned long size)
-{
-	int ret;
-
-	mmap_read_lock(current->mm);
-	ret = videobuf_dma_init_user_locked(dma, direction, data, size);
-	mmap_read_unlock(current->mm);
-
-	return ret;
-}
-
-static int videobuf_dma_init_kernel(struct videobuf_dmabuf *dma, int direction,
-				    unsigned long nr_pages)
-{
-	int i;
-
-	dprintk(1, "init kernel [%lu pages]\n", nr_pages);
-
-	dma->direction = direction;
-	dma->vaddr_pages = kcalloc(nr_pages, sizeof(*dma->vaddr_pages),
-				   GFP_KERNEL);
-	if (!dma->vaddr_pages)
-		return -ENOMEM;
-
-	dma->dma_addr = kcalloc(nr_pages, sizeof(*dma->dma_addr), GFP_KERNEL);
-	if (!dma->dma_addr) {
-		kfree(dma->vaddr_pages);
-		return -ENOMEM;
-	}
-	for (i = 0; i < nr_pages; i++) {
-		void *addr;
-
-		addr = dma_alloc_coherent(dma->dev, PAGE_SIZE,
-					  &(dma->dma_addr[i]), GFP_KERNEL);
-		if (addr == NULL)
-			goto out_free_pages;
-
-		dma->vaddr_pages[i] = virt_to_page(addr);
-	}
-	dma->vaddr = vmap(dma->vaddr_pages, nr_pages, VM_MAP | VM_IOREMAP,
-			  PAGE_KERNEL);
-	if (NULL == dma->vaddr) {
-		dprintk(1, "vmalloc_32(%lu pages) failed\n", nr_pages);
-		goto out_free_pages;
-	}
-
-	dprintk(1, "vmalloc is at addr %p, size=%lu\n",
-		dma->vaddr, nr_pages << PAGE_SHIFT);
-
-	memset(dma->vaddr, 0, nr_pages << PAGE_SHIFT);
-	dma->nr_pages = nr_pages;
-
-	return 0;
-out_free_pages:
-	while (i > 0) {
-		void *addr;
-
-		i--;
-		addr = page_address(dma->vaddr_pages[i]);
-		dma_free_coherent(dma->dev, PAGE_SIZE, addr, dma->dma_addr[i]);
-	}
-	kfree(dma->dma_addr);
-	dma->dma_addr = NULL;
-	kfree(dma->vaddr_pages);
-	dma->vaddr_pages = NULL;
-
-	return -ENOMEM;
-
-}
-
-static int videobuf_dma_init_overlay(struct videobuf_dmabuf *dma, int direction,
-			      dma_addr_t addr, unsigned long nr_pages)
-{
-	dprintk(1, "init overlay [%lu pages @ bus 0x%lx]\n",
-		nr_pages, (unsigned long)addr);
-	dma->direction = direction;
-
-	if (0 == addr)
-		return -EINVAL;
-
-	dma->bus_addr = addr;
-	dma->nr_pages = nr_pages;
-
-	return 0;
-}
-
-static int videobuf_dma_map(struct device *dev, struct videobuf_dmabuf *dma)
-{
-	MAGIC_CHECK(dma->magic, MAGIC_DMABUF);
-	BUG_ON(0 == dma->nr_pages);
-
-	if (dma->pages) {
-		dma->sglist = videobuf_pages_to_sg(dma->pages, dma->nr_pages,
-						   dma->offset, dma->size);
-	}
-	if (dma->vaddr) {
-		dma->sglist = videobuf_vmalloc_to_sg(dma->vaddr,
-						     dma->nr_pages);
-	}
-	if (dma->bus_addr) {
-		dma->sglist = vmalloc(sizeof(*dma->sglist));
-		if (NULL != dma->sglist) {
-			dma->sglen = 1;
-			sg_dma_address(&dma->sglist[0])	= dma->bus_addr
-							& PAGE_MASK;
-			dma->sglist[0].offset = dma->bus_addr & ~PAGE_MASK;
-			sg_dma_len(&dma->sglist[0]) = dma->nr_pages * PAGE_SIZE;
-		}
-	}
-	if (NULL == dma->sglist) {
-		dprintk(1, "scatterlist is NULL\n");
-		return -ENOMEM;
-	}
-	if (!dma->bus_addr) {
-		dma->sglen = dma_map_sg(dev, dma->sglist,
-					dma->nr_pages, dma->direction);
-		if (0 == dma->sglen) {
-			printk(KERN_WARNING
-			       "%s: videobuf_map_sg failed\n", __func__);
-			vfree(dma->sglist);
-			dma->sglist = NULL;
-			dma->sglen = 0;
-			return -ENOMEM;
-		}
-	}
-
-	return 0;
-}
-
-int videobuf_dma_unmap(struct device *dev, struct videobuf_dmabuf *dma)
-{
-	MAGIC_CHECK(dma->magic, MAGIC_DMABUF);
-
-	if (!dma->sglen)
-		return 0;
-
-	dma_unmap_sg(dev, dma->sglist, dma->nr_pages, dma->direction);
-
-	vfree(dma->sglist);
-	dma->sglist = NULL;
-	dma->sglen = 0;
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(videobuf_dma_unmap);
-
-int videobuf_dma_free(struct videobuf_dmabuf *dma)
-{
-	int i;
-	MAGIC_CHECK(dma->magic, MAGIC_DMABUF);
-	BUG_ON(dma->sglen);
-
-	if (dma->pages) {
-		unpin_user_pages_dirty_lock(dma->pages, dma->nr_pages,
-					    dma->direction == DMA_FROM_DEVICE);
-		kfree(dma->pages);
-		dma->pages = NULL;
-	}
-
-	if (dma->dma_addr) {
-		for (i = 0; i < dma->nr_pages; i++) {
-			void *addr;
-
-			addr = page_address(dma->vaddr_pages[i]);
-			dma_free_coherent(dma->dev, PAGE_SIZE, addr,
-					  dma->dma_addr[i]);
-		}
-		kfree(dma->dma_addr);
-		dma->dma_addr = NULL;
-		kfree(dma->vaddr_pages);
-		dma->vaddr_pages = NULL;
-		vunmap(dma->vaddr);
-		dma->vaddr = NULL;
-	}
-
-	if (dma->bus_addr)
-		dma->bus_addr = 0;
-	dma->direction = DMA_NONE;
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(videobuf_dma_free);
-
-/* --------------------------------------------------------------------- */
-
-static void videobuf_vm_open(struct vm_area_struct *vma)
-{
-	struct videobuf_mapping *map = vma->vm_private_data;
-
-	dprintk(2, "vm_open %p [count=%d,vma=%08lx-%08lx]\n", map,
-		map->count, vma->vm_start, vma->vm_end);
-
-	map->count++;
-}
-
-static void videobuf_vm_close(struct vm_area_struct *vma)
-{
-	struct videobuf_mapping *map = vma->vm_private_data;
-	struct videobuf_queue *q = map->q;
-	struct videobuf_dma_sg_memory *mem;
-	int i;
-
-	dprintk(2, "vm_close %p [count=%d,vma=%08lx-%08lx]\n", map,
-		map->count, vma->vm_start, vma->vm_end);
-
-	map->count--;
-	if (0 == map->count) {
-		dprintk(1, "munmap %p q=%p\n", map, q);
-		videobuf_queue_lock(q);
-		for (i = 0; i < VIDEO_MAX_FRAME; i++) {
-			if (NULL == q->bufs[i])
-				continue;
-			mem = q->bufs[i]->priv;
-			if (!mem)
-				continue;
-
-			MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
-
-			if (q->bufs[i]->map != map)
-				continue;
-			q->bufs[i]->map   = NULL;
-			q->bufs[i]->baddr = 0;
-			q->ops->buf_release(q, q->bufs[i]);
-		}
-		videobuf_queue_unlock(q);
-		kfree(map);
-	}
-}
-
-/*
- * Get a anonymous page for the mapping.  Make sure we can DMA to that
- * memory location with 32bit PCI devices (i.e. don't use highmem for
- * now ...).  Bounce buffers don't work very well for the data rates
- * video capture has.
- */
-static vm_fault_t videobuf_vm_fault(struct vm_fault *vmf)
-{
-	struct vm_area_struct *vma = vmf->vma;
-	struct page *page;
-
-	dprintk(3, "fault: fault @ %08lx [vma %08lx-%08lx]\n",
-		vmf->address, vma->vm_start, vma->vm_end);
-
-	page = alloc_page(GFP_USER | __GFP_DMA32);
-	if (!page)
-		return VM_FAULT_OOM;
-	clear_user_highpage(page, vmf->address);
-	vmf->page = page;
-
-	return 0;
-}
-
-static const struct vm_operations_struct videobuf_vm_ops = {
-	.open	= videobuf_vm_open,
-	.close	= videobuf_vm_close,
-	.fault	= videobuf_vm_fault,
-};
-
-/* ---------------------------------------------------------------------
- * SG handlers for the generic methods
- */
-
-/* Allocated area consists on 3 parts:
-	struct video_buffer
-	struct <driver>_buffer (cx88_buffer, saa7134_buf, ...)
-	struct videobuf_dma_sg_memory
- */
-
-static struct videobuf_buffer *__videobuf_alloc_vb(size_t size)
-{
-	struct videobuf_dma_sg_memory *mem;
-	struct videobuf_buffer *vb;
-
-	vb = kzalloc(size + sizeof(*mem), GFP_KERNEL);
-	if (!vb)
-		return vb;
-
-	mem = vb->priv = ((char *)vb) + size;
-	mem->magic = MAGIC_SG_MEM;
-
-	videobuf_dma_init(&mem->dma);
-
-	dprintk(1, "%s: allocated at %p(%ld+%ld) & %p(%ld)\n",
-		__func__, vb, (long)sizeof(*vb), (long)size - sizeof(*vb),
-		mem, (long)sizeof(*mem));
-
-	return vb;
-}
-
-static void *__videobuf_to_vaddr(struct videobuf_buffer *buf)
-{
-	struct videobuf_dma_sg_memory *mem = buf->priv;
-	BUG_ON(!mem);
-
-	MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
-
-	return mem->dma.vaddr;
-}
-
-static int __videobuf_iolock(struct videobuf_queue *q,
-			     struct videobuf_buffer *vb,
-			     struct v4l2_framebuffer *fbuf)
-{
-	struct videobuf_dma_sg_memory *mem = vb->priv;
-	unsigned long pages;
-	dma_addr_t bus;
-	int err;
-
-	BUG_ON(!mem);
-
-	MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
-
-	if (!mem->dma.dev)
-		mem->dma.dev = q->dev;
-	else
-		WARN_ON(mem->dma.dev != q->dev);
-
-	switch (vb->memory) {
-	case V4L2_MEMORY_MMAP:
-	case V4L2_MEMORY_USERPTR:
-		if (0 == vb->baddr) {
-			/* no userspace addr -- kernel bounce buffer */
-			pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
-			err = videobuf_dma_init_kernel(&mem->dma,
-						       DMA_FROM_DEVICE,
-						       pages);
-			if (0 != err)
-				return err;
-		} else if (vb->memory == V4L2_MEMORY_USERPTR) {
-			/* dma directly to userspace */
-			err = videobuf_dma_init_user(&mem->dma,
-						     DMA_FROM_DEVICE,
-						     vb->baddr, vb->bsize);
-			if (0 != err)
-				return err;
-		} else {
-			/* NOTE: HACK: videobuf_iolock on V4L2_MEMORY_MMAP
-			buffers can only be called from videobuf_qbuf
-			we take current->mm->mmap_lock there, to prevent
-			locking inversion, so don't take it here */
-
-			err = videobuf_dma_init_user_locked(&mem->dma,
-						      DMA_FROM_DEVICE,
-						      vb->baddr, vb->bsize);
-			if (0 != err)
-				return err;
-		}
-		break;
-	case V4L2_MEMORY_OVERLAY:
-		if (NULL == fbuf)
-			return -EINVAL;
-		/* FIXME: need sanity checks for vb->boff */
-		/*
-		 * Using a double cast to avoid compiler warnings when
-		 * building for PAE. Compiler doesn't like direct casting
-		 * of a 32 bit ptr to 64 bit integer.
-		 */
-		bus   = (dma_addr_t)(unsigned long)fbuf->base + vb->boff;
-		pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
-		err = videobuf_dma_init_overlay(&mem->dma, DMA_FROM_DEVICE,
-						bus, pages);
-		if (0 != err)
-			return err;
-		break;
-	default:
-		BUG();
-	}
-	err = videobuf_dma_map(q->dev, &mem->dma);
-	if (0 != err)
-		return err;
-
-	return 0;
-}
-
-static int __videobuf_sync(struct videobuf_queue *q,
-			   struct videobuf_buffer *buf)
-{
-	struct videobuf_dma_sg_memory *mem = buf->priv;
-	BUG_ON(!mem || !mem->dma.sglen);
-
-	MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
-	MAGIC_CHECK(mem->dma.magic, MAGIC_DMABUF);
-
-	dma_sync_sg_for_cpu(q->dev, mem->dma.sglist,
-			    mem->dma.nr_pages, mem->dma.direction);
-
-	return 0;
-}
-
-static int __videobuf_mmap_mapper(struct videobuf_queue *q,
-				  struct videobuf_buffer *buf,
-				  struct vm_area_struct *vma)
-{
-	struct videobuf_dma_sg_memory *mem = buf->priv;
-	struct videobuf_mapping *map;
-	unsigned int first, last, size = 0, i;
-	int retval;
-
-	retval = -EINVAL;
-
-	BUG_ON(!mem);
-	MAGIC_CHECK(mem->magic, MAGIC_SG_MEM);
-
-	/* look for first buffer to map */
-	for (first = 0; first < VIDEO_MAX_FRAME; first++) {
-		if (buf == q->bufs[first]) {
-			size = PAGE_ALIGN(q->bufs[first]->bsize);
-			break;
-		}
-	}
-
-	/* paranoia, should never happen since buf is always valid. */
-	if (!size) {
-		dprintk(1, "mmap app bug: offset invalid [offset=0x%lx]\n",
-				(vma->vm_pgoff << PAGE_SHIFT));
-		goto done;
-	}
-
-	last = first;
-
-	/* create mapping + update buffer list */
-	retval = -ENOMEM;
-	map = kmalloc(sizeof(struct videobuf_mapping), GFP_KERNEL);
-	if (NULL == map)
-		goto done;
-
-	size = 0;
-	for (i = first; i <= last; i++) {
-		if (NULL == q->bufs[i])
-			continue;
-		q->bufs[i]->map   = map;
-		q->bufs[i]->baddr = vma->vm_start + size;
-		size += PAGE_ALIGN(q->bufs[i]->bsize);
-	}
-
-	map->count    = 1;
-	map->q        = q;
-	vma->vm_ops   = &videobuf_vm_ops;
-	/* using shared anonymous pages */
-	vm_flags_mod(vma, VM_DONTEXPAND | VM_DONTDUMP, VM_IO);
-	vma->vm_private_data = map;
-	dprintk(1, "mmap %p: q=%p %08lx-%08lx pgoff %08lx bufs %d-%d\n",
-		map, q, vma->vm_start, vma->vm_end, vma->vm_pgoff, first, last);
-	retval = 0;
-
-done:
-	return retval;
-}
-
-static struct videobuf_qtype_ops sg_ops = {
-	.magic        = MAGIC_QTYPE_OPS,
-
-	.alloc_vb     = __videobuf_alloc_vb,
-	.iolock       = __videobuf_iolock,
-	.sync         = __videobuf_sync,
-	.mmap_mapper  = __videobuf_mmap_mapper,
-	.vaddr        = __videobuf_to_vaddr,
-};
-
-void *videobuf_sg_alloc(size_t size)
-{
-	struct videobuf_queue q;
-
-	/* Required to make generic handler to call __videobuf_alloc */
-	q.int_ops = &sg_ops;
-
-	q.msize = size;
-
-	return videobuf_alloc_vb(&q);
-}
-EXPORT_SYMBOL_GPL(videobuf_sg_alloc);
-
-void videobuf_queue_sg_init(struct videobuf_queue *q,
-			 const struct videobuf_queue_ops *ops,
-			 struct device *dev,
-			 spinlock_t *irqlock,
-			 enum v4l2_buf_type type,
-			 enum v4l2_field field,
-			 unsigned int msize,
-			 void *priv,
-			 struct mutex *ext_lock)
-{
-	videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize,
-				 priv, &sg_ops, ext_lock);
-}
-EXPORT_SYMBOL_GPL(videobuf_queue_sg_init);
-