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vmw_balloon: merge send_lock and send_unlock path 

The lock and unlock code paths are very similar, so avoid the duplicate
code by merging them together.

Reviewed-by: Xavier Deguillard <xdeguillard@vmware.com>
Signed-off-by: Nadav Amit <namit@vmware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nadav Amit 2018-09-20 10:30:09 -07:00 committed by Greg Kroah-Hartman
parent 681311848c
commit 4c9a7d6a77
1 changed files with 21 additions and 41 deletions
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62
drivers/misc/vmw_balloon.c
View File

@ -420,16 +420,18 @@ static bool vmballoon_send_get_target(struct vmballoon *b)
* check the return value and maybe submit a different page.
*/
static int vmballoon_send_lock_page(struct vmballoon *b, unsigned long pfn,
unsigned int *hv_status)
unsigned int *hv_status, bool lock)
{
unsigned long status;
unsigned long status, cmd;
u32 pfn32;
pfn32 = (u32)pfn;
if (pfn32 != pfn)
return -EINVAL;
*hv_status = status = vmballoon_cmd(b, VMW_BALLOON_CMD_LOCK, pfn, 0);
cmd = lock ? VMW_BALLOON_CMD_LOCK : VMW_BALLOON_CMD_UNLOCK;
*hv_status = status = vmballoon_cmd(b, cmd, pfn, 0);
if (status == VMW_BALLOON_SUCCESS)
return 0;
@ -438,13 +440,18 @@ static int vmballoon_send_lock_page(struct vmballoon *b, unsigned long pfn,
}
static int vmballoon_send_batched_lock(struct vmballoon *b,
unsigned int num_pages, bool is_2m_pages)
unsigned int num_pages, bool is_2m_pages,
bool lock)
{
unsigned long pfn = PHYS_PFN(virt_to_phys(b->batch_page));
unsigned long status, cmd;
cmd = is_2m_pages ? VMW_BALLOON_CMD_BATCHED_2M_LOCK :
VMW_BALLOON_CMD_BATCHED_LOCK;
if (lock)
cmd = is_2m_pages ? VMW_BALLOON_CMD_BATCHED_2M_LOCK :
VMW_BALLOON_CMD_BATCHED_LOCK;
else
cmd = is_2m_pages ? VMW_BALLOON_CMD_BATCHED_2M_UNLOCK :
VMW_BALLOON_CMD_BATCHED_UNLOCK;
status = vmballoon_cmd(b, cmd, pfn, num_pages);
@ -454,37 +461,6 @@ static int vmballoon_send_batched_lock(struct vmballoon *b,
return 1;
}
/*
* Notify the host that guest intends to release given page back into
* the pool of available (to the guest) pages.
*/
static bool vmballoon_send_unlock_page(struct vmballoon *b, unsigned long pfn)
{
unsigned long status;
u32 pfn32;
pfn32 = (u32)pfn;
if (pfn32 != pfn)
return false;
status = vmballoon_cmd(b, VMW_BALLOON_CMD_UNLOCK, pfn, 0);
return status == VMW_BALLOON_SUCCESS;
}
static bool vmballoon_send_batched_unlock(struct vmballoon *b,
unsigned int num_pages, bool is_2m_pages)
{
unsigned long pfn = PHYS_PFN(virt_to_phys(b->batch_page));
unsigned long status, cmd;
cmd = is_2m_pages ? VMW_BALLOON_CMD_BATCHED_2M_UNLOCK :
VMW_BALLOON_CMD_BATCHED_UNLOCK;
status = vmballoon_cmd(b, cmd, pfn, num_pages);
return status == VMW_BALLOON_SUCCESS;
}
static struct page *vmballoon_alloc_page(gfp_t flags, bool is_2m_page)
{
if (is_2m_page)
@ -546,7 +522,8 @@ static int vmballoon_lock_page(struct vmballoon *b, unsigned int num_pages,
/* is_2m_pages can never happen as 2m pages support implies batching */
locked = vmballoon_send_lock_page(b, page_to_pfn(page), &hv_status);
locked = vmballoon_send_lock_page(b, page_to_pfn(page), &hv_status,
true);
if (locked) {
STATS_INC(b->stats.refused_alloc[false]);
@ -587,7 +564,7 @@ static int vmballoon_lock_batched_page(struct vmballoon *b,
int locked, i;
u16 size_per_page = vmballoon_page_size(is_2m_pages);
locked = vmballoon_send_batched_lock(b, num_pages, is_2m_pages);
locked = vmballoon_send_batched_lock(b, num_pages, is_2m_pages, true);
if (locked > 0) {
for (i = 0; i < num_pages; i++) {
@ -645,10 +622,12 @@ static int vmballoon_unlock_page(struct vmballoon *b, unsigned int num_pages,
{
struct page *page = b->page;
struct vmballoon_page_size *page_size = &b->page_sizes[false];
unsigned int hv_status;
/* is_2m_pages can never happen as 2m pages support implies batching */
if (!vmballoon_send_unlock_page(b, page_to_pfn(page))) {
if (!vmballoon_send_lock_page(b, page_to_pfn(page), &hv_status,
false)) {
list_add(&page->lru, &page_size->pages);
return -EIO;
}
@ -670,7 +649,8 @@ static int vmballoon_unlock_batched_page(struct vmballoon *b,
bool hv_success;
u16 size_per_page = vmballoon_page_size(is_2m_pages);
hv_success = vmballoon_send_batched_unlock(b, num_pages, is_2m_pages);
hv_success = vmballoon_send_batched_lock(b, num_pages, is_2m_pages,
false);
if (!hv_success)
ret = -EIO;