xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

vmbus: keep pointer to ring buffer page

Browse Source 
Avoid going from struct page to virt address (and back) by just
keeping pointer to the allocated pages instead of virt address.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stephen Hemminger
2018-09-14 09:10:16 -07:00
committed by Greg Kroah-Hartman
parent 800b932969
commit 52a42c2a90
3 changed files with 13 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/uio/uio_hv_generic.c
View File

@@ -130,11 +130,12 @@ static int hv_uio_ring_mmap(struct file *filp, struct kobject *kobj,
= container_of(kobj, struct vmbus_channel, kobj);
struct hv_device *dev = channel->primary_channel->device_obj;
u16 q_idx = channel->offermsg.offer.sub_channel_index;
void *ring_buffer = page_address(channel->ringbuffer_page);
dev_dbg(&dev->device, "mmap channel %u pages %#lx at %#lx\n",
q_idx, vma_pages(vma), vma->vm_pgoff);
return vm_iomap_memory(vma, virt_to_phys(channel->ringbuffer_pages),
return vm_iomap_memory(vma, virt_to_phys(ring_buffer),
channel->ringbuffer_pagecount << PAGE_SHIFT);
}
@@ -223,7 +224,7 @@ hv_uio_probe(struct hv_device *dev,
/* mem resources */
pdata->info.mem[TXRX_RING_MAP].name = "txrx_rings";
pdata->info.mem[TXRX_RING_MAP].addr
= (uintptr_t)dev->channel->ringbuffer_pages;
= (uintptr_t)page_address(dev->channel->ringbuffer_page);
pdata->info.mem[TXRX_RING_MAP].size
= dev->channel->ringbuffer_pagecount << PAGE_SHIFT;
pdata->info.mem[TXRX_RING_MAP].memtype = UIO_MEM_LOGICAL;