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 <sthem...@microsoft.com>
---
drivers/hv/channel.c | 20 +++++++++-----------
drivers/uio/uio_hv_generic.c | 5 +++--
include/linux/hyperv.h | 2 +-
3 files changed, 13 insertions(+), 14 deletions(-)
diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index 33e6db02dbab..56ec0d96d876 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -91,11 +91,14 @@ int vmbus_open(struct vmbus_channel *newchannel, u32
send_ringbuffer_size,
unsigned long flags;
int ret, err = 0;
struct page *page;
+ unsigned int order;
if (send_ringbuffer_size % PAGE_SIZE ||
recv_ringbuffer_size % PAGE_SIZE)
return -EINVAL;
+ order = get_order(send_ringbuffer_size + recv_ringbuffer_size);
+
spin_lock_irqsave(&newchannel->lock, flags);
if (newchannel->state == CHANNEL_OPEN_STATE) {
newchannel->state = CHANNEL_OPENING_STATE;
@@ -110,21 +113,17 @@ int vmbus_open(struct vmbus_channel *newchannel, u32
send_ringbuffer_size,
/* Allocate the ring buffer */
page = alloc_pages_node(cpu_to_node(newchannel->target_cpu),
- GFP_KERNEL|__GFP_ZERO,
- get_order(send_ringbuffer_size +
- recv_ringbuffer_size));
+ GFP_KERNEL|__GFP_ZERO, order);
if (!page)
- page = alloc_pages(GFP_KERNEL|__GFP_ZERO,
- get_order(send_ringbuffer_size +
- recv_ringbuffer_size));
+ page = alloc_pages(GFP_KERNEL|__GFP_ZERO, order);
if (!page) {
err = -ENOMEM;
goto error_set_chnstate;
}
- newchannel->ringbuffer_pages = page_address(page);
+ newchannel->ringbuffer_page = page;
newchannel->ringbuffer_pagecount = (send_ringbuffer_size +
recv_ringbuffer_size) >> PAGE_SHIFT;
@@ -239,8 +238,7 @@ int vmbus_open(struct vmbus_channel *newchannel, u32
send_ringbuffer_size,
error_free_pages:
hv_ringbuffer_cleanup(&newchannel->outbound);
hv_ringbuffer_cleanup(&newchannel->inbound);
- __free_pages(page,
- get_order(send_ringbuffer_size + recv_ringbuffer_size));
+ __free_pages(page, order);
error_set_chnstate:
newchannel->state = CHANNEL_OPEN_STATE;
return err;
@@ -658,8 +656,8 @@ static int vmbus_close_internal(struct vmbus_channel
*channel)
hv_ringbuffer_cleanup(&channel->outbound);
hv_ringbuffer_cleanup(&channel->inbound);
- free_pages((unsigned long)channel->ringbuffer_pages,
- get_order(channel->ringbuffer_pagecount * PAGE_SIZE));
+ __free_pages(channel->ringbuffer_page,
+ get_order(channel->ringbuffer_pagecount << PAGE_SHIFT));
out:
return ret;
diff --git a/drivers/uio/uio_hv_generic.c b/drivers/uio/uio_hv_generic.c
index a08860260f55..ba67a5267557 100644
--- a/drivers/uio/uio_hv_generic.c
+++ b/drivers/uio/uio_hv_generic.c
@@ -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;
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 6c4575c7f46b..a6c32d2d090b 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -739,7 +739,7 @@ struct vmbus_channel {
u32 ringbuffer_gpadlhandle;
/* Allocated memory for ring buffer */
- void *ringbuffer_pages;
+ struct page *ringbuffer_page;
u32 ringbuffer_pagecount;
struct hv_ring_buffer_info outbound; /* send to parent */
struct hv_ring_buffer_info inbound; /* receive from parent */
--
2.18.0
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