static void async_pf_execute(struct work_struct *work)
{
struct kvm_async_pf *apf =
container_of(work, struct kvm_async_pf, work);
struct mm_struct *mm = apf->mm;
struct kvm_vcpu *vcpu = apf->vcpu;
unsigned long addr = apf->addr;
gva_t gva = apf->gva;
might_sleep();
get_user_pages_unlocked(NULL, mm, addr, 1, 1, 0, NULL);
kvm_async_page_present_sync(vcpu, apf);
spin_lock(&vcpu->async_pf.lock);
list_add_tail(&apf->link, &vcpu->async_pf.done);
spin_unlock(&vcpu->async_pf.lock);
/*
* apf may be freed by kvm_check_async_pf_completion() after
* this point
*/
trace_kvm_async_pf_completed(addr, gva);
/*
* This memory barrier pairs with prepare_to_wait's set_current_state()
*/
smp_mb();
if (waitqueue_active(&vcpu->wq))
wake_up_interruptible(&vcpu->wq);
mmput(mm);
kvm_put_kvm(vcpu->kvm);
}
int get_user_pages_fast(unsigned long start, int nr_pages, int write,
struct page **pages)
{
struct mm_struct *mm = current->mm;
int nr, ret;
start &= PAGE_MASK;
nr = __get_user_pages_fast(start, nr_pages, write, pages);
ret = nr;
if (nr < nr_pages) {
pr_devel(" slow path ! nr = %d\n", nr);
/* Try to get the remaining pages with get_user_pages */
start += nr << PAGE_SHIFT;
pages += nr;
ret = get_user_pages_unlocked(current, mm, start,
nr_pages - nr,
write, 0, pages);
/* Have to be a bit careful with return values */
if (nr > 0) {
if (ret < 0)
ret = nr;
else
ret += nr;
}
}
return ret;
}
/**
* process_vm_rw_single_vec - read/write pages from task specified
* @addr: start memory address of target process
* @len: size of area to copy to/from
* @iter: where to copy to/from locally
* @process_pages: struct pages area that can store at least
* nr_pages_to_copy struct page pointers
* @mm: mm for task
* @task: task to read/write from
* @vm_write: 0 means copy from, 1 means copy to
* Returns 0 on success or on failure error code
*/
static int process_vm_rw_single_vec(unsigned long addr,
unsigned long len,
struct iov_iter *iter,
struct page **process_pages,
struct mm_struct *mm,
struct task_struct *task,
int vm_write)
{
unsigned long pa = addr & PAGE_MASK;
unsigned long start_offset = addr - pa;
unsigned long nr_pages;
ssize_t rc = 0;
unsigned long max_pages_per_loop = PVM_MAX_KMALLOC_PAGES
/ sizeof(struct pages *);
/* Work out address and page range required */
if (len == 0)
return 0;
nr_pages = (addr + len - 1) / PAGE_SIZE - addr / PAGE_SIZE + 1;
while (!rc && nr_pages && iov_iter_count(iter)) {
int pages = min(nr_pages, max_pages_per_loop);
size_t bytes;
/* Get the pages we're interested in */
pages = get_user_pages_unlocked(task, mm, pa, pages,
vm_write, 0, process_pages);
if (pages <= 0)
return -EFAULT;
bytes = pages * PAGE_SIZE - start_offset;
if (bytes > len)
bytes = len;
rc = process_vm_rw_pages(process_pages,
start_offset, bytes, iter,
vm_write);
len -= bytes;
start_offset = 0;
nr_pages -= pages;
pa += pages * PAGE_SIZE;
while (pages)
put_page(process_pages[--pages]);
}
return rc;
}
int ivtv_udma_setup(struct ivtv *itv, unsigned long ivtv_dest_addr,
void __user *userbuf, int size_in_bytes)
{
struct ivtv_dma_page_info user_dma;
struct ivtv_user_dma *dma = &itv->udma;
int i, err;
IVTV_DEBUG_DMA("ivtv_udma_setup, dst: 0x%08x\n", (unsigned int)ivtv_dest_addr);
/* Still in USE */
if (dma->SG_length || dma->page_count) {
IVTV_DEBUG_WARN("ivtv_udma_setup: SG_length %d page_count %d still full?\n",
dma->SG_length, dma->page_count);
return -EBUSY;
}
ivtv_udma_get_page_info(&user_dma, (unsigned long)userbuf, size_in_bytes);
if (user_dma.page_count <= 0) {
IVTV_DEBUG_WARN("ivtv_udma_setup: Error %d page_count from %d bytes %d offset\n",
user_dma.page_count, size_in_bytes, user_dma.offset);
return -EINVAL;
}
/* Get user pages for DMA Xfer */
err = get_user_pages_unlocked(user_dma.uaddr, user_dma.page_count, 0,
1, dma->map);
if (user_dma.page_count != err) {
IVTV_DEBUG_WARN("failed to map user pages, returned %d instead of %d\n",
err, user_dma.page_count);
if (err >= 0) {
for (i = 0; i < err; i++)
put_page(dma->map[i]);
return -EINVAL;
}
return err;
}
dma->page_count = user_dma.page_count;
/* Fill SG List with new values */
if (ivtv_udma_fill_sg_list(dma, &user_dma, 0) < 0) {
for (i = 0; i < dma->page_count; i++) {
put_page(dma->map[i]);
}
dma->page_count = 0;
return -ENOMEM;
}
/* Map SG List */
dma->SG_length = pci_map_sg(itv->pdev, dma->SGlist, dma->page_count, PCI_DMA_TODEVICE);
/* Fill SG Array with new values */
ivtv_udma_fill_sg_array (dma, ivtv_dest_addr, 0, -1);
/* Tag SG Array with Interrupt Bit */
dma->SGarray[dma->SG_length - 1].size |= cpu_to_le32(0x80000000);
ivtv_udma_sync_for_device(itv);
return dma->page_count;
}
static int ivtv_yuv_prep_user_dma(struct ivtv *itv, struct ivtv_user_dma *dma,
struct ivtv_dma_frame *args)
{
struct ivtv_dma_page_info y_dma;
struct ivtv_dma_page_info uv_dma;
struct yuv_playback_info *yi = &itv->yuv_info;
u8 frame = yi->draw_frame;
struct yuv_frame_info *f = &yi->new_frame_info[frame];
int i;
int y_pages, uv_pages;
unsigned long y_buffer_offset, uv_buffer_offset;
int y_decode_height, uv_decode_height, y_size;
y_buffer_offset = IVTV_DECODER_OFFSET + yuv_offset[frame];
uv_buffer_offset = y_buffer_offset + IVTV_YUV_BUFFER_UV_OFFSET;
y_decode_height = uv_decode_height = f->src_h + f->src_y;
if (f->offset_y)
y_buffer_offset += 720 * 16;
if (y_decode_height & 15)
y_decode_height = (y_decode_height + 16) & ~15;
if (uv_decode_height & 31)
uv_decode_height = (uv_decode_height + 32) & ~31;
y_size = 720 * y_decode_height;
/* Still in USE */
if (dma->SG_length || dma->page_count) {
IVTV_DEBUG_WARN
("prep_user_dma: SG_length %d page_count %d still full?\n",
dma->SG_length, dma->page_count);
return -EBUSY;
}
ivtv_udma_get_page_info (&y_dma, (unsigned long)args->y_source, 720 * y_decode_height);
ivtv_udma_get_page_info (&uv_dma, (unsigned long)args->uv_source, 360 * uv_decode_height);
/* Get user pages for DMA Xfer */
y_pages = get_user_pages_unlocked(y_dma.uaddr,
y_dma.page_count, &dma->map[0], FOLL_FORCE);
uv_pages = 0; /* silence gcc. value is set and consumed only if: */
if (y_pages == y_dma.page_count) {
uv_pages = get_user_pages_unlocked(uv_dma.uaddr,
uv_dma.page_count, &dma->map[y_pages],
FOLL_FORCE);
}
if (y_pages != y_dma.page_count || uv_pages != uv_dma.page_count) {
int rc = -EFAULT;
if (y_pages == y_dma.page_count) {
IVTV_DEBUG_WARN
("failed to map uv user pages, returned %d "
"expecting %d\n", uv_pages, uv_dma.page_count);
if (uv_pages >= 0) {
for (i = 0; i < uv_pages; i++)
put_page(dma->map[y_pages + i]);
rc = -EFAULT;
} else {
rc = uv_pages;
}
} else {
IVTV_DEBUG_WARN
("failed to map y user pages, returned %d "
"expecting %d\n", y_pages, y_dma.page_count);
}
if (y_pages >= 0) {
for (i = 0; i < y_pages; i++)
put_page(dma->map[i]);
/*
* Inherit the -EFAULT from rc's
* initialization, but allow it to be
* overriden by uv_pages above if it was an
* actual errno.
*/
} else {
rc = y_pages;
}
return rc;
}
dma->page_count = y_pages + uv_pages;
/* Fill & map SG List */
if (ivtv_udma_fill_sg_list (dma, &uv_dma, ivtv_udma_fill_sg_list (dma, &y_dma, 0)) < 0) {
IVTV_DEBUG_WARN("could not allocate bounce buffers for highmem userspace buffers\n");
for (i = 0; i < dma->page_count; i++) {
put_page(dma->map[i]);
}
dma->page_count = 0;
return -ENOMEM;
}
dma->SG_length = pci_map_sg(itv->pdev, dma->SGlist, dma->page_count, PCI_DMA_TODEVICE);
/* Fill SG Array with new values */
ivtv_udma_fill_sg_array(dma, y_buffer_offset, uv_buffer_offset, y_size);
/* If we've offset the y plane, ensure top area is blanked */
if (f->offset_y && yi->blanking_dmaptr) {
dma->SGarray[dma->SG_length].size = cpu_to_le32(720*16);
dma->SGarray[dma->SG_length].src = cpu_to_le32(yi->blanking_dmaptr);
dma->SGarray[dma->SG_length].dst = cpu_to_le32(IVTV_DECODER_OFFSET + yuv_offset[frame]);
dma->SG_length++;
}
/* Tag SG Array with Interrupt Bit */
dma->SGarray[dma->SG_length - 1].size |= cpu_to_le32(0x80000000);
ivtv_udma_sync_for_device(itv);
return 0;
}
