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mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-24 13:13:57 +08:00
linux-next/drivers/misc/vmw_balloon.c
Linus Torvalds 45763bf4bc Char/Misc driver patches for 5.1-rc1
Here is the big char/misc driver patch pull request for 5.1-rc1.
 
 The largest thing by far is the new habanalabs driver for their AI
 accelerator chip.  For now it is in the drivers/misc directory but will
 probably move to a new directory soon along with other drivers of this
 type.
 
 Other than that, just the usual set of individual driver updates and
 fixes.  There's an "odd" merge in here from the DRM tree that they asked
 me to do as the MEI driver is starting to interact with the i915 driver,
 and it needed some coordination.  All of those patches have been
 properly acked by the relevant subsystem maintainers.
 
 All of these have been in linux-next with no reported issues, most for
 quite some time.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'char-misc-5.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

Pull char/misc driver updates from Greg KH:
 "Here is the big char/misc driver patch pull request for 5.1-rc1.

  The largest thing by far is the new habanalabs driver for their AI
  accelerator chip. For now it is in the drivers/misc directory but will
  probably move to a new directory soon along with other drivers of this
  type.

  Other than that, just the usual set of individual driver updates and
  fixes. There's an "odd" merge in here from the DRM tree that they
  asked me to do as the MEI driver is starting to interact with the i915
  driver, and it needed some coordination. All of those patches have
  been properly acked by the relevant subsystem maintainers.

  All of these have been in linux-next with no reported issues, most for
  quite some time"

* tag 'char-misc-5.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (219 commits)
  habanalabs: adjust Kconfig to fix build errors
  habanalabs: use %px instead of %p in error print
  habanalabs: use do_div for 64-bit divisions
  intel_th: gth: Fix an off-by-one in output unassigning
  habanalabs: fix little-endian<->cpu conversion warnings
  habanalabs: use NULL to initialize array of pointers
  habanalabs: fix little-endian<->cpu conversion warnings
  habanalabs: soft-reset device if context-switch fails
  habanalabs: print pointer using %p
  habanalabs: fix memory leak with CBs with unaligned size
  habanalabs: return correct error code on MMU mapping failure
  habanalabs: add comments in uapi/misc/habanalabs.h
  habanalabs: extend QMAN0 job timeout
  habanalabs: set DMA0 completion to SOB 1007
  habanalabs: fix validation of WREG32 to DMA completion
  habanalabs: fix mmu cache registers init
  habanalabs: disable CPU access on timeouts
  habanalabs: add MMU DRAM default page mapping
  habanalabs: Dissociate RAZWI info from event types
  misc/habanalabs: adjust Kconfig to fix build errors
  ...
2019-03-06 14:18:59 -08:00

1614 lines
44 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* VMware Balloon driver.
*
* Copyright (C) 2000-2018, VMware, Inc. All Rights Reserved.
*
* This is VMware physical memory management driver for Linux. The driver
* acts like a "balloon" that can be inflated to reclaim physical pages by
* reserving them in the guest and invalidating them in the monitor,
* freeing up the underlying machine pages so they can be allocated to
* other guests. The balloon can also be deflated to allow the guest to
* use more physical memory. Higher level policies can control the sizes
* of balloons in VMs in order to manage physical memory resources.
*/
//#define DEBUG
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/sched.h>
#include <linux/module.h>
#include <linux/workqueue.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/rwsem.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/vmw_vmci_defs.h>
#include <linux/vmw_vmci_api.h>
#include <asm/hypervisor.h>
MODULE_AUTHOR("VMware, Inc.");
MODULE_DESCRIPTION("VMware Memory Control (Balloon) Driver");
MODULE_ALIAS("dmi:*:svnVMware*:*");
MODULE_ALIAS("vmware_vmmemctl");
MODULE_LICENSE("GPL");
/*
* Use __GFP_HIGHMEM to allow pages from HIGHMEM zone. We don't allow wait
* (__GFP_RECLAIM) for huge page allocations. Use __GFP_NOWARN, to suppress page
* allocation failure warnings. Disallow access to emergency low-memory pools.
*/
#define VMW_HUGE_PAGE_ALLOC_FLAGS (__GFP_HIGHMEM|__GFP_NOWARN| \
__GFP_NOMEMALLOC)
/*
* Use __GFP_HIGHMEM to allow pages from HIGHMEM zone. We allow lightweight
* reclamation (__GFP_NORETRY). Use __GFP_NOWARN, to suppress page allocation
* failure warnings. Disallow access to emergency low-memory pools.
*/
#define VMW_PAGE_ALLOC_FLAGS (__GFP_HIGHMEM|__GFP_NOWARN| \
__GFP_NOMEMALLOC|__GFP_NORETRY)
/* Maximum number of refused pages we accumulate during inflation cycle */
#define VMW_BALLOON_MAX_REFUSED 16
/*
* Hypervisor communication port definitions.
*/
#define VMW_BALLOON_HV_PORT 0x5670
#define VMW_BALLOON_HV_MAGIC 0x456c6d6f
#define VMW_BALLOON_GUEST_ID 1 /* Linux */
enum vmwballoon_capabilities {
/*
* Bit 0 is reserved and not associated to any capability.
*/
VMW_BALLOON_BASIC_CMDS = (1 << 1),
VMW_BALLOON_BATCHED_CMDS = (1 << 2),
VMW_BALLOON_BATCHED_2M_CMDS = (1 << 3),
VMW_BALLOON_SIGNALLED_WAKEUP_CMD = (1 << 4),
VMW_BALLOON_64_BIT_TARGET = (1 << 5)
};
#define VMW_BALLOON_CAPABILITIES_COMMON (VMW_BALLOON_BASIC_CMDS \
| VMW_BALLOON_BATCHED_CMDS \
| VMW_BALLOON_BATCHED_2M_CMDS \
| VMW_BALLOON_SIGNALLED_WAKEUP_CMD)
#define VMW_BALLOON_2M_ORDER (PMD_SHIFT - PAGE_SHIFT)
/*
* 64-bit targets are only supported in 64-bit
*/
#ifdef CONFIG_64BIT
#define VMW_BALLOON_CAPABILITIES (VMW_BALLOON_CAPABILITIES_COMMON \
| VMW_BALLOON_64_BIT_TARGET)
#else
#define VMW_BALLOON_CAPABILITIES VMW_BALLOON_CAPABILITIES_COMMON
#endif
enum vmballoon_page_size_type {
VMW_BALLOON_4K_PAGE,
VMW_BALLOON_2M_PAGE,
VMW_BALLOON_LAST_SIZE = VMW_BALLOON_2M_PAGE
};
#define VMW_BALLOON_NUM_PAGE_SIZES (VMW_BALLOON_LAST_SIZE + 1)
static const char * const vmballoon_page_size_names[] = {
[VMW_BALLOON_4K_PAGE] = "4k",
[VMW_BALLOON_2M_PAGE] = "2M"
};
enum vmballoon_op {
VMW_BALLOON_INFLATE,
VMW_BALLOON_DEFLATE
};
enum vmballoon_op_stat_type {
VMW_BALLOON_OP_STAT,
VMW_BALLOON_OP_FAIL_STAT
};
#define VMW_BALLOON_OP_STAT_TYPES (VMW_BALLOON_OP_FAIL_STAT + 1)
/**
* enum vmballoon_cmd_type - backdoor commands.
*
* Availability of the commands is as followed:
*
* %VMW_BALLOON_CMD_START, %VMW_BALLOON_CMD_GET_TARGET and
* %VMW_BALLOON_CMD_GUEST_ID are always available.
*
* If the host reports %VMW_BALLOON_BASIC_CMDS are supported then
* %VMW_BALLOON_CMD_LOCK and %VMW_BALLOON_CMD_UNLOCK commands are available.
*
* If the host reports %VMW_BALLOON_BATCHED_CMDS are supported then
* %VMW_BALLOON_CMD_BATCHED_LOCK and VMW_BALLOON_CMD_BATCHED_UNLOCK commands
* are available.
*
* If the host reports %VMW_BALLOON_BATCHED_2M_CMDS are supported then
* %VMW_BALLOON_CMD_BATCHED_2M_LOCK and %VMW_BALLOON_CMD_BATCHED_2M_UNLOCK
* are supported.
*
* If the host reports VMW_BALLOON_SIGNALLED_WAKEUP_CMD is supported then
* VMW_BALLOON_CMD_VMCI_DOORBELL_SET command is supported.
*
* @VMW_BALLOON_CMD_START: Communicating supported version with the hypervisor.
* @VMW_BALLOON_CMD_GET_TARGET: Gets the balloon target size.
* @VMW_BALLOON_CMD_LOCK: Informs the hypervisor about a ballooned page.
* @VMW_BALLOON_CMD_UNLOCK: Informs the hypervisor about a page that is about
* to be deflated from the balloon.
* @VMW_BALLOON_CMD_GUEST_ID: Informs the hypervisor about the type of OS that
* runs in the VM.
* @VMW_BALLOON_CMD_BATCHED_LOCK: Inform the hypervisor about a batch of
* ballooned pages (up to 512).
* @VMW_BALLOON_CMD_BATCHED_UNLOCK: Inform the hypervisor about a batch of
* pages that are about to be deflated from the
* balloon (up to 512).
* @VMW_BALLOON_CMD_BATCHED_2M_LOCK: Similar to @VMW_BALLOON_CMD_BATCHED_LOCK
* for 2MB pages.
* @VMW_BALLOON_CMD_BATCHED_2M_UNLOCK: Similar to
* @VMW_BALLOON_CMD_BATCHED_UNLOCK for 2MB
* pages.
* @VMW_BALLOON_CMD_VMCI_DOORBELL_SET: A command to set doorbell notification
* that would be invoked when the balloon
* size changes.
* @VMW_BALLOON_CMD_LAST: Value of the last command.
*/
enum vmballoon_cmd_type {
VMW_BALLOON_CMD_START,
VMW_BALLOON_CMD_GET_TARGET,
VMW_BALLOON_CMD_LOCK,
VMW_BALLOON_CMD_UNLOCK,
VMW_BALLOON_CMD_GUEST_ID,
/* No command 5 */
VMW_BALLOON_CMD_BATCHED_LOCK = 6,
VMW_BALLOON_CMD_BATCHED_UNLOCK,
VMW_BALLOON_CMD_BATCHED_2M_LOCK,
VMW_BALLOON_CMD_BATCHED_2M_UNLOCK,
VMW_BALLOON_CMD_VMCI_DOORBELL_SET,
VMW_BALLOON_CMD_LAST = VMW_BALLOON_CMD_VMCI_DOORBELL_SET,
};
#define VMW_BALLOON_CMD_NUM (VMW_BALLOON_CMD_LAST + 1)
enum vmballoon_error_codes {
VMW_BALLOON_SUCCESS,
VMW_BALLOON_ERROR_CMD_INVALID,
VMW_BALLOON_ERROR_PPN_INVALID,
VMW_BALLOON_ERROR_PPN_LOCKED,
VMW_BALLOON_ERROR_PPN_UNLOCKED,
VMW_BALLOON_ERROR_PPN_PINNED,
VMW_BALLOON_ERROR_PPN_NOTNEEDED,
VMW_BALLOON_ERROR_RESET,
VMW_BALLOON_ERROR_BUSY
};
#define VMW_BALLOON_SUCCESS_WITH_CAPABILITIES (0x03000000)
#define VMW_BALLOON_CMD_WITH_TARGET_MASK \
((1UL << VMW_BALLOON_CMD_GET_TARGET) | \
(1UL << VMW_BALLOON_CMD_LOCK) | \
(1UL << VMW_BALLOON_CMD_UNLOCK) | \
(1UL << VMW_BALLOON_CMD_BATCHED_LOCK) | \
(1UL << VMW_BALLOON_CMD_BATCHED_UNLOCK) | \
(1UL << VMW_BALLOON_CMD_BATCHED_2M_LOCK) | \
(1UL << VMW_BALLOON_CMD_BATCHED_2M_UNLOCK))
static const char * const vmballoon_cmd_names[] = {
[VMW_BALLOON_CMD_START] = "start",
[VMW_BALLOON_CMD_GET_TARGET] = "target",
[VMW_BALLOON_CMD_LOCK] = "lock",
[VMW_BALLOON_CMD_UNLOCK] = "unlock",
[VMW_BALLOON_CMD_GUEST_ID] = "guestType",
[VMW_BALLOON_CMD_BATCHED_LOCK] = "batchLock",
[VMW_BALLOON_CMD_BATCHED_UNLOCK] = "batchUnlock",
[VMW_BALLOON_CMD_BATCHED_2M_LOCK] = "2m-lock",
[VMW_BALLOON_CMD_BATCHED_2M_UNLOCK] = "2m-unlock",
[VMW_BALLOON_CMD_VMCI_DOORBELL_SET] = "doorbellSet"
};
enum vmballoon_stat_page {
VMW_BALLOON_PAGE_STAT_ALLOC,
VMW_BALLOON_PAGE_STAT_ALLOC_FAIL,
VMW_BALLOON_PAGE_STAT_REFUSED_ALLOC,
VMW_BALLOON_PAGE_STAT_REFUSED_FREE,
VMW_BALLOON_PAGE_STAT_FREE,
VMW_BALLOON_PAGE_STAT_LAST = VMW_BALLOON_PAGE_STAT_FREE
};
#define VMW_BALLOON_PAGE_STAT_NUM (VMW_BALLOON_PAGE_STAT_LAST + 1)
enum vmballoon_stat_general {
VMW_BALLOON_STAT_TIMER,
VMW_BALLOON_STAT_DOORBELL,
VMW_BALLOON_STAT_RESET,
VMW_BALLOON_STAT_LAST = VMW_BALLOON_STAT_RESET
};
#define VMW_BALLOON_STAT_NUM (VMW_BALLOON_STAT_LAST + 1)
static DEFINE_STATIC_KEY_TRUE(vmw_balloon_batching);
static DEFINE_STATIC_KEY_FALSE(balloon_stat_enabled);
struct vmballoon_ctl {
struct list_head pages;
struct list_head refused_pages;
unsigned int n_refused_pages;
unsigned int n_pages;
enum vmballoon_page_size_type page_size;
enum vmballoon_op op;
};
struct vmballoon_page_size {
/* list of reserved physical pages */
struct list_head pages;
};
/**
* struct vmballoon_batch_entry - a batch entry for lock or unlock.
*
* @status: the status of the operation, which is written by the hypervisor.
* @reserved: reserved for future use. Must be set to zero.
* @pfn: the physical frame number of the page to be locked or unlocked.
*/
struct vmballoon_batch_entry {
u64 status : 5;
u64 reserved : PAGE_SHIFT - 5;
u64 pfn : 52;
} __packed;
struct vmballoon {
struct vmballoon_page_size page_sizes[VMW_BALLOON_NUM_PAGE_SIZES];
/**
* @max_page_size: maximum supported page size for ballooning.
*
* Protected by @conf_sem
*/
enum vmballoon_page_size_type max_page_size;
/**
* @size: balloon actual size in basic page size (frames).
*
* While we currently do not support size which is bigger than 32-bit,
* in preparation for future support, use 64-bits.
*/
atomic64_t size;
/**
* @target: balloon target size in basic page size (frames).
*
* We do not protect the target under the assumption that setting the
* value is always done through a single write. If this assumption ever
* breaks, we would have to use X_ONCE for accesses, and suffer the less
* optimized code. Although we may read stale target value if multiple
* accesses happen at once, the performance impact should be minor.
*/
unsigned long target;
/**
* @reset_required: reset flag
*
* Setting this flag may introduce races, but the code is expected to
* handle them gracefully. In the worst case, another operation will
* fail as reset did not take place. Clearing the flag is done while
* holding @conf_sem for write.
*/
bool reset_required;
/**
* @capabilities: hypervisor balloon capabilities.
*
* Protected by @conf_sem.
*/
unsigned long capabilities;
/**
* @batch_page: pointer to communication batch page.
*
* When batching is used, batch_page points to a page, which holds up to
* %VMW_BALLOON_BATCH_MAX_PAGES entries for locking or unlocking.
*/
struct vmballoon_batch_entry *batch_page;
/**
* @batch_max_pages: maximum pages that can be locked/unlocked.
*
* Indicates the number of pages that the hypervisor can lock or unlock
* at once, according to whether batching is enabled. If batching is
* disabled, only a single page can be locked/unlock on each operation.
*
* Protected by @conf_sem.
*/
unsigned int batch_max_pages;
/**
* @page: page to be locked/unlocked by the hypervisor
*
* @page is only used when batching is disabled and a single page is
* reclaimed on each iteration.
*
* Protected by @comm_lock.
*/
struct page *page;
/* statistics */
struct vmballoon_stats *stats;
#ifdef CONFIG_DEBUG_FS
/* debugfs file exporting statistics */
struct dentry *dbg_entry;
#endif
struct delayed_work dwork;
/**
* @vmci_doorbell.
*
* Protected by @conf_sem.
*/
struct vmci_handle vmci_doorbell;
/**
* @conf_sem: semaphore to protect the configuration and the statistics.
*/
struct rw_semaphore conf_sem;
/**
* @comm_lock: lock to protect the communication with the host.
*
* Lock ordering: @conf_sem -> @comm_lock .
*/
spinlock_t comm_lock;
};
static struct vmballoon balloon;
struct vmballoon_stats {
/* timer / doorbell operations */
atomic64_t general_stat[VMW_BALLOON_STAT_NUM];
/* allocation statistics for huge and small pages */
atomic64_t
page_stat[VMW_BALLOON_PAGE_STAT_NUM][VMW_BALLOON_NUM_PAGE_SIZES];
/* Monitor operations: total operations, and failures */
atomic64_t ops[VMW_BALLOON_CMD_NUM][VMW_BALLOON_OP_STAT_TYPES];
};
static inline bool is_vmballoon_stats_on(void)
{
return IS_ENABLED(CONFIG_DEBUG_FS) &&
static_branch_unlikely(&balloon_stat_enabled);
}
static inline void vmballoon_stats_op_inc(struct vmballoon *b, unsigned int op,
enum vmballoon_op_stat_type type)
{
if (is_vmballoon_stats_on())
atomic64_inc(&b->stats->ops[op][type]);
}
static inline void vmballoon_stats_gen_inc(struct vmballoon *b,
enum vmballoon_stat_general stat)
{
if (is_vmballoon_stats_on())
atomic64_inc(&b->stats->general_stat[stat]);
}
static inline void vmballoon_stats_gen_add(struct vmballoon *b,
enum vmballoon_stat_general stat,
unsigned int val)
{
if (is_vmballoon_stats_on())
atomic64_add(val, &b->stats->general_stat[stat]);
}
static inline void vmballoon_stats_page_inc(struct vmballoon *b,
enum vmballoon_stat_page stat,
enum vmballoon_page_size_type size)
{
if (is_vmballoon_stats_on())
atomic64_inc(&b->stats->page_stat[stat][size]);
}
static inline void vmballoon_stats_page_add(struct vmballoon *b,
enum vmballoon_stat_page stat,
enum vmballoon_page_size_type size,
unsigned int val)
{
if (is_vmballoon_stats_on())
atomic64_add(val, &b->stats->page_stat[stat][size]);
}
static inline unsigned long
__vmballoon_cmd(struct vmballoon *b, unsigned long cmd, unsigned long arg1,
unsigned long arg2, unsigned long *result)
{
unsigned long status, dummy1, dummy2, dummy3, local_result;
vmballoon_stats_op_inc(b, cmd, VMW_BALLOON_OP_STAT);
asm volatile ("inl %%dx" :
"=a"(status),
"=c"(dummy1),
"=d"(dummy2),
"=b"(local_result),
"=S"(dummy3) :
"0"(VMW_BALLOON_HV_MAGIC),
"1"(cmd),
"2"(VMW_BALLOON_HV_PORT),
"3"(arg1),
"4"(arg2) :
"memory");
/* update the result if needed */
if (result)
*result = (cmd == VMW_BALLOON_CMD_START) ? dummy1 :
local_result;
/* update target when applicable */
if (status == VMW_BALLOON_SUCCESS &&
((1ul << cmd) & VMW_BALLOON_CMD_WITH_TARGET_MASK))
WRITE_ONCE(b->target, local_result);
if (status != VMW_BALLOON_SUCCESS &&
status != VMW_BALLOON_SUCCESS_WITH_CAPABILITIES) {
vmballoon_stats_op_inc(b, cmd, VMW_BALLOON_OP_FAIL_STAT);
pr_debug("%s: %s [0x%lx,0x%lx) failed, returned %ld\n",
__func__, vmballoon_cmd_names[cmd], arg1, arg2,
status);
}
/* mark reset required accordingly */
if (status == VMW_BALLOON_ERROR_RESET)
b->reset_required = true;
return status;
}
static __always_inline unsigned long
vmballoon_cmd(struct vmballoon *b, unsigned long cmd, unsigned long arg1,
unsigned long arg2)
{
unsigned long dummy;
return __vmballoon_cmd(b, cmd, arg1, arg2, &dummy);
}
/*
* Send "start" command to the host, communicating supported version
* of the protocol.
*/
static int vmballoon_send_start(struct vmballoon *b, unsigned long req_caps)
{
unsigned long status, capabilities;
status = __vmballoon_cmd(b, VMW_BALLOON_CMD_START, req_caps, 0,
&capabilities);
switch (status) {
case VMW_BALLOON_SUCCESS_WITH_CAPABILITIES:
b->capabilities = capabilities;
break;
case VMW_BALLOON_SUCCESS:
b->capabilities = VMW_BALLOON_BASIC_CMDS;
break;
default:
return -EIO;
}
/*
* 2MB pages are only supported with batching. If batching is for some
* reason disabled, do not use 2MB pages, since otherwise the legacy
* mechanism is used with 2MB pages, causing a failure.
*/
b->max_page_size = VMW_BALLOON_4K_PAGE;
if ((b->capabilities & VMW_BALLOON_BATCHED_2M_CMDS) &&
(b->capabilities & VMW_BALLOON_BATCHED_CMDS))
b->max_page_size = VMW_BALLOON_2M_PAGE;
return 0;
}
/**
* vmballoon_send_guest_id - communicate guest type to the host.
*
* @b: pointer to the balloon.
*
* Communicate guest type to the host so that it can adjust ballooning
* algorithm to the one most appropriate for the guest. This command
* is normally issued after sending "start" command and is part of
* standard reset sequence.
*
* Return: zero on success or appropriate error code.
*/
static int vmballoon_send_guest_id(struct vmballoon *b)
{
unsigned long status;
status = vmballoon_cmd(b, VMW_BALLOON_CMD_GUEST_ID,
VMW_BALLOON_GUEST_ID, 0);
return status == VMW_BALLOON_SUCCESS ? 0 : -EIO;
}
/**
* vmballoon_page_order() - return the order of the page
* @page_size: the size of the page.
*
* Return: the allocation order.
*/
static inline
unsigned int vmballoon_page_order(enum vmballoon_page_size_type page_size)
{
return page_size == VMW_BALLOON_2M_PAGE ? VMW_BALLOON_2M_ORDER : 0;
}
/**
* vmballoon_page_in_frames() - returns the number of frames in a page.
* @page_size: the size of the page.
*
* Return: the number of 4k frames.
*/
static inline unsigned int
vmballoon_page_in_frames(enum vmballoon_page_size_type page_size)
{
return 1 << vmballoon_page_order(page_size);
}
/**
* vmballoon_mark_page_offline() - mark a page as offline
* @page: pointer for the page.
* @page_size: the size of the page.
*/
static void
vmballoon_mark_page_offline(struct page *page,
enum vmballoon_page_size_type page_size)
{
int i;
for (i = 0; i < vmballoon_page_in_frames(page_size); i++)
__SetPageOffline(page + i);
}
/**
* vmballoon_mark_page_online() - mark a page as online
* @page: pointer for the page.
* @page_size: the size of the page.
*/
static void
vmballoon_mark_page_online(struct page *page,
enum vmballoon_page_size_type page_size)
{
int i;
for (i = 0; i < vmballoon_page_in_frames(page_size); i++)
__ClearPageOffline(page + i);
}
/**
* vmballoon_send_get_target() - Retrieve desired balloon size from the host.
*
* @b: pointer to the balloon.
*
* Return: zero on success, EINVAL if limit does not fit in 32-bit, as required
* by the host-guest protocol and EIO if an error occurred in communicating with
* the host.
*/
static int vmballoon_send_get_target(struct vmballoon *b)
{
unsigned long status;
unsigned long limit;
limit = totalram_pages();
/* Ensure limit fits in 32-bits if 64-bit targets are not supported */
if (!(b->capabilities & VMW_BALLOON_64_BIT_TARGET) &&
limit != (u32)limit)
return -EINVAL;
status = vmballoon_cmd(b, VMW_BALLOON_CMD_GET_TARGET, limit, 0);
return status == VMW_BALLOON_SUCCESS ? 0 : -EIO;
}
/**
* vmballoon_alloc_page_list - allocates a list of pages.
*
* @b: pointer to the balloon.
* @ctl: pointer for the %struct vmballoon_ctl, which defines the operation.
* @req_n_pages: the number of requested pages.
*
* Tries to allocate @req_n_pages. Add them to the list of balloon pages in
* @ctl.pages and updates @ctl.n_pages to reflect the number of pages.
*
* Return: zero on success or error code otherwise.
*/
static int vmballoon_alloc_page_list(struct vmballoon *b,
struct vmballoon_ctl *ctl,
unsigned int req_n_pages)
{
struct page *page;
unsigned int i;
for (i = 0; i < req_n_pages; i++) {
if (ctl->page_size == VMW_BALLOON_2M_PAGE)
page = alloc_pages(VMW_HUGE_PAGE_ALLOC_FLAGS,
VMW_BALLOON_2M_ORDER);
else
page = alloc_page(VMW_PAGE_ALLOC_FLAGS);
/* Update statistics */
vmballoon_stats_page_inc(b, VMW_BALLOON_PAGE_STAT_ALLOC,
ctl->page_size);
if (page) {
vmballoon_mark_page_offline(page, ctl->page_size);
/* Success. Add the page to the list and continue. */
list_add(&page->lru, &ctl->pages);
continue;
}
/* Allocation failed. Update statistics and stop. */
vmballoon_stats_page_inc(b, VMW_BALLOON_PAGE_STAT_ALLOC_FAIL,
ctl->page_size);
break;
}
ctl->n_pages = i;
return req_n_pages == ctl->n_pages ? 0 : -ENOMEM;
}
/**
* vmballoon_handle_one_result - Handle lock/unlock result for a single page.
*
* @b: pointer for %struct vmballoon.
* @page: pointer for the page whose result should be handled.
* @page_size: size of the page.
* @status: status of the operation as provided by the hypervisor.
*/
static int vmballoon_handle_one_result(struct vmballoon *b, struct page *page,
enum vmballoon_page_size_type page_size,
unsigned long status)
{
/* On success do nothing. The page is already on the balloon list. */
if (likely(status == VMW_BALLOON_SUCCESS))
return 0;
pr_debug("%s: failed comm pfn %lx status %lu page_size %s\n", __func__,
page_to_pfn(page), status,
vmballoon_page_size_names[page_size]);
/* Error occurred */
vmballoon_stats_page_inc(b, VMW_BALLOON_PAGE_STAT_REFUSED_ALLOC,
page_size);
return -EIO;
}
/**
* vmballoon_status_page - returns the status of (un)lock operation
*
* @b: pointer to the balloon.
* @idx: index for the page for which the operation is performed.
* @p: pointer to where the page struct is returned.
*
* Following a lock or unlock operation, returns the status of the operation for
* an individual page. Provides the page that the operation was performed on on
* the @page argument.
*
* Returns: The status of a lock or unlock operation for an individual page.
*/
static unsigned long vmballoon_status_page(struct vmballoon *b, int idx,
struct page **p)
{
if (static_branch_likely(&vmw_balloon_batching)) {
/* batching mode */
*p = pfn_to_page(b->batch_page[idx].pfn);
return b->batch_page[idx].status;
}
/* non-batching mode */
*p = b->page;
/*
* If a failure occurs, the indication will be provided in the status
* of the entire operation, which is considered before the individual
* page status. So for non-batching mode, the indication is always of
* success.
*/
return VMW_BALLOON_SUCCESS;
}
/**
* vmballoon_lock_op - notifies the host about inflated/deflated pages.
* @b: pointer to the balloon.
* @num_pages: number of inflated/deflated pages.
* @page_size: size of the page.
* @op: the type of operation (lock or unlock).
*
* Notify the host about page(s) that were ballooned (or removed from the
* balloon) so that host can use it without fear that guest will need it (or
* stop using them since the VM does). Host may reject some pages, we need to
* check the return value and maybe submit a different page. The pages that are
* inflated/deflated are pointed by @b->page.
*
* Return: result as provided by the hypervisor.
*/
static unsigned long vmballoon_lock_op(struct vmballoon *b,
unsigned int num_pages,
enum vmballoon_page_size_type page_size,
enum vmballoon_op op)
{
unsigned long cmd, pfn;
lockdep_assert_held(&b->comm_lock);
if (static_branch_likely(&vmw_balloon_batching)) {
if (op == VMW_BALLOON_INFLATE)
cmd = page_size == VMW_BALLOON_2M_PAGE ?
VMW_BALLOON_CMD_BATCHED_2M_LOCK :
VMW_BALLOON_CMD_BATCHED_LOCK;
else
cmd = page_size == VMW_BALLOON_2M_PAGE ?
VMW_BALLOON_CMD_BATCHED_2M_UNLOCK :
VMW_BALLOON_CMD_BATCHED_UNLOCK;
pfn = PHYS_PFN(virt_to_phys(b->batch_page));
} else {
cmd = op == VMW_BALLOON_INFLATE ? VMW_BALLOON_CMD_LOCK :
VMW_BALLOON_CMD_UNLOCK;
pfn = page_to_pfn(b->page);
/* In non-batching mode, PFNs must fit in 32-bit */
if (unlikely(pfn != (u32)pfn))
return VMW_BALLOON_ERROR_PPN_INVALID;
}
return vmballoon_cmd(b, cmd, pfn, num_pages);
}
/**
* vmballoon_add_page - adds a page towards lock/unlock operation.
*
* @b: pointer to the balloon.
* @idx: index of the page to be ballooned in this batch.
* @p: pointer to the page that is about to be ballooned.
*
* Adds the page to be ballooned. Must be called while holding @comm_lock.
*/
static void vmballoon_add_page(struct vmballoon *b, unsigned int idx,
struct page *p)
{
lockdep_assert_held(&b->comm_lock);
if (static_branch_likely(&vmw_balloon_batching))
b->batch_page[idx] = (struct vmballoon_batch_entry)
{ .pfn = page_to_pfn(p) };
else
b->page = p;
}
/**
* vmballoon_lock - lock or unlock a batch of pages.
*
* @b: pointer to the balloon.
* @ctl: pointer for the %struct vmballoon_ctl, which defines the operation.
*
* Notifies the host of about ballooned pages (after inflation or deflation,
* according to @ctl). If the host rejects the page put it on the
* @ctl refuse list. These refused page are then released when moving to the
* next size of pages.
*
* Note that we neither free any @page here nor put them back on the ballooned
* pages list. Instead we queue it for later processing. We do that for several
* reasons. First, we do not want to free the page under the lock. Second, it
* allows us to unify the handling of lock and unlock. In the inflate case, the
* caller will check if there are too many refused pages and release them.
* Although it is not identical to the past behavior, it should not affect
* performance.
*/
static int vmballoon_lock(struct vmballoon *b, struct vmballoon_ctl *ctl)
{
unsigned long batch_status;
struct page *page;
unsigned int i, num_pages;
num_pages = ctl->n_pages;
if (num_pages == 0)
return 0;
/* communication with the host is done under the communication lock */
spin_lock(&b->comm_lock);
i = 0;
list_for_each_entry(page, &ctl->pages, lru)
vmballoon_add_page(b, i++, page);
batch_status = vmballoon_lock_op(b, ctl->n_pages, ctl->page_size,
ctl->op);
/*
* Iterate over the pages in the provided list. Since we are changing
* @ctl->n_pages we are saving the original value in @num_pages and
* use this value to bound the loop.
*/
for (i = 0; i < num_pages; i++) {
unsigned long status;
status = vmballoon_status_page(b, i, &page);
/*
* Failure of the whole batch overrides a single operation
* results.
*/
if (batch_status != VMW_BALLOON_SUCCESS)
status = batch_status;
/* Continue if no error happened */
if (!vmballoon_handle_one_result(b, page, ctl->page_size,
status))
continue;
/*
* Error happened. Move the pages to the refused list and update
* the pages number.
*/
list_move(&page->lru, &ctl->refused_pages);
ctl->n_pages--;
ctl->n_refused_pages++;
}
spin_unlock(&b->comm_lock);
return batch_status == VMW_BALLOON_SUCCESS ? 0 : -EIO;
}
/**
* vmballoon_release_page_list() - Releases a page list
*
* @page_list: list of pages to release.
* @n_pages: pointer to the number of pages.
* @page_size: whether the pages in the list are 2MB (or else 4KB).
*
* Releases the list of pages and zeros the number of pages.
*/
static void vmballoon_release_page_list(struct list_head *page_list,
int *n_pages,
enum vmballoon_page_size_type page_size)
{
struct page *page, *tmp;
list_for_each_entry_safe(page, tmp, page_list, lru) {
list_del(&page->lru);
vmballoon_mark_page_online(page, page_size);
__free_pages(page, vmballoon_page_order(page_size));
}
*n_pages = 0;
}
/*
* Release pages that were allocated while attempting to inflate the
* balloon but were refused by the host for one reason or another.
*/
static void vmballoon_release_refused_pages(struct vmballoon *b,
struct vmballoon_ctl *ctl)
{
vmballoon_stats_page_inc(b, VMW_BALLOON_PAGE_STAT_REFUSED_FREE,
ctl->page_size);
vmballoon_release_page_list(&ctl->refused_pages, &ctl->n_refused_pages,
ctl->page_size);
}
/**
* vmballoon_change - retrieve the required balloon change
*
* @b: pointer for the balloon.
*
* Return: the required change for the balloon size. A positive number
* indicates inflation, a negative number indicates a deflation.
*/
static int64_t vmballoon_change(struct vmballoon *b)
{
int64_t size, target;
size = atomic64_read(&b->size);
target = READ_ONCE(b->target);
/*
* We must cast first because of int sizes
* Otherwise we might get huge positives instead of negatives
*/
if (b->reset_required)
return 0;
/* consider a 2MB slack on deflate, unless the balloon is emptied */
if (target < size && target != 0 &&
size - target < vmballoon_page_in_frames(VMW_BALLOON_2M_PAGE))
return 0;
return target - size;
}
/**
* vmballoon_enqueue_page_list() - Enqueues list of pages after inflation.
*
* @b: pointer to balloon.
* @pages: list of pages to enqueue.
* @n_pages: pointer to number of pages in list. The value is zeroed.
* @page_size: whether the pages are 2MB or 4KB pages.
*
* Enqueues the provides list of pages in the ballooned page list, clears the
* list and zeroes the number of pages that was provided.
*/
static void vmballoon_enqueue_page_list(struct vmballoon *b,
struct list_head *pages,
unsigned int *n_pages,
enum vmballoon_page_size_type page_size)
{
struct vmballoon_page_size *page_size_info = &b->page_sizes[page_size];
list_splice_init(pages, &page_size_info->pages);
*n_pages = 0;
}
/**
* vmballoon_dequeue_page_list() - Dequeues page lists for deflation.
*
* @b: pointer to balloon.
* @pages: list of pages to enqueue.
* @n_pages: pointer to number of pages in list. The value is zeroed.
* @page_size: whether the pages are 2MB or 4KB pages.
* @n_req_pages: the number of requested pages.
*
* Dequeues the number of requested pages from the balloon for deflation. The
* number of dequeued pages may be lower, if not enough pages in the requested
* size are available.
*/
static void vmballoon_dequeue_page_list(struct vmballoon *b,
struct list_head *pages,
unsigned int *n_pages,
enum vmballoon_page_size_type page_size,
unsigned int n_req_pages)
{
struct vmballoon_page_size *page_size_info = &b->page_sizes[page_size];
struct page *page, *tmp;
unsigned int i = 0;
list_for_each_entry_safe(page, tmp, &page_size_info->pages, lru) {
list_move(&page->lru, pages);
if (++i == n_req_pages)
break;
}
*n_pages = i;
}
/**
* vmballoon_inflate() - Inflate the balloon towards its target size.
*
* @b: pointer to the balloon.
*/
static void vmballoon_inflate(struct vmballoon *b)
{
int64_t to_inflate_frames;
struct vmballoon_ctl ctl = {
.pages = LIST_HEAD_INIT(ctl.pages),
.refused_pages = LIST_HEAD_INIT(ctl.refused_pages),
.page_size = b->max_page_size,
.op = VMW_BALLOON_INFLATE
};
while ((to_inflate_frames = vmballoon_change(b)) > 0) {
unsigned int to_inflate_pages, page_in_frames;
int alloc_error, lock_error = 0;
VM_BUG_ON(!list_empty(&ctl.pages));
VM_BUG_ON(ctl.n_pages != 0);
page_in_frames = vmballoon_page_in_frames(ctl.page_size);
to_inflate_pages = min_t(unsigned long, b->batch_max_pages,
DIV_ROUND_UP_ULL(to_inflate_frames,
page_in_frames));
/* Start by allocating */
alloc_error = vmballoon_alloc_page_list(b, &ctl,
to_inflate_pages);
/* Actually lock the pages by telling the hypervisor */
lock_error = vmballoon_lock(b, &ctl);
/*
* If an error indicates that something serious went wrong,
* stop the inflation.
*/
if (lock_error)
break;
/* Update the balloon size */
atomic64_add(ctl.n_pages * page_in_frames, &b->size);
vmballoon_enqueue_page_list(b, &ctl.pages, &ctl.n_pages,
ctl.page_size);
/*
* If allocation failed or the number of refused pages exceeds
* the maximum allowed, move to the next page size.
*/
if (alloc_error ||
ctl.n_refused_pages >= VMW_BALLOON_MAX_REFUSED) {
if (ctl.page_size == VMW_BALLOON_4K_PAGE)
break;
/*
* Ignore errors from locking as we now switch to 4k
* pages and we might get different errors.
*/
vmballoon_release_refused_pages(b, &ctl);
ctl.page_size--;
}
cond_resched();
}
/*
* Release pages that were allocated while attempting to inflate the
* balloon but were refused by the host for one reason or another,
* and update the statistics.
*/
if (ctl.n_refused_pages != 0)
vmballoon_release_refused_pages(b, &ctl);
}
/**
* vmballoon_deflate() - Decrease the size of the balloon.
*
* @b: pointer to the balloon
* @n_frames: the number of frames to deflate. If zero, automatically
* calculated according to the target size.
* @coordinated: whether to coordinate with the host
*
* Decrease the size of the balloon allowing guest to use more memory.
*
* Return: The number of deflated frames (i.e., basic page size units)
*/
static unsigned long vmballoon_deflate(struct vmballoon *b, uint64_t n_frames,
bool coordinated)
{
unsigned long deflated_frames = 0;
unsigned long tried_frames = 0;
struct vmballoon_ctl ctl = {
.pages = LIST_HEAD_INIT(ctl.pages),
.refused_pages = LIST_HEAD_INIT(ctl.refused_pages),
.page_size = VMW_BALLOON_4K_PAGE,
.op = VMW_BALLOON_DEFLATE
};
/* free pages to reach target */
while (true) {
unsigned int to_deflate_pages, n_unlocked_frames;
unsigned int page_in_frames;
int64_t to_deflate_frames;
bool deflated_all;
page_in_frames = vmballoon_page_in_frames(ctl.page_size);
VM_BUG_ON(!list_empty(&ctl.pages));
VM_BUG_ON(ctl.n_pages);
VM_BUG_ON(!list_empty(&ctl.refused_pages));
VM_BUG_ON(ctl.n_refused_pages);
/*
* If we were requested a specific number of frames, we try to
* deflate this number of frames. Otherwise, deflation is
* performed according to the target and balloon size.
*/
to_deflate_frames = n_frames ? n_frames - tried_frames :
-vmballoon_change(b);
/* break if no work to do */
if (to_deflate_frames <= 0)
break;
/*
* Calculate the number of frames based on current page size,
* but limit the deflated frames to a single chunk
*/
to_deflate_pages = min_t(unsigned long, b->batch_max_pages,
DIV_ROUND_UP_ULL(to_deflate_frames,
page_in_frames));
/* First take the pages from the balloon pages. */
vmballoon_dequeue_page_list(b, &ctl.pages, &ctl.n_pages,
ctl.page_size, to_deflate_pages);
/*
* Before pages are moving to the refused list, count their
* frames as frames that we tried to deflate.
*/
tried_frames += ctl.n_pages * page_in_frames;
/*
* Unlock the pages by communicating with the hypervisor if the
* communication is coordinated (i.e., not pop). We ignore the
* return code. Instead we check if all the pages we manage to
* unlock all the pages. If we failed, we will move to the next
* page size, and would eventually try again later.
*/
if (coordinated)
vmballoon_lock(b, &ctl);
/*
* Check if we deflated enough. We will move to the next page
* size if we did not manage to do so. This calculation takes
* place now, as once the pages are released, the number of
* pages is zeroed.
*/
deflated_all = (ctl.n_pages == to_deflate_pages);
/* Update local and global counters */
n_unlocked_frames = ctl.n_pages * page_in_frames;
atomic64_sub(n_unlocked_frames, &b->size);
deflated_frames += n_unlocked_frames;
vmballoon_stats_page_add(b, VMW_BALLOON_PAGE_STAT_FREE,
ctl.page_size, ctl.n_pages);
/* free the ballooned pages */
vmballoon_release_page_list(&ctl.pages, &ctl.n_pages,
ctl.page_size);
/* Return the refused pages to the ballooned list. */
vmballoon_enqueue_page_list(b, &ctl.refused_pages,
&ctl.n_refused_pages,
ctl.page_size);
/* If we failed to unlock all the pages, move to next size. */
if (!deflated_all) {
if (ctl.page_size == b->max_page_size)
break;
ctl.page_size++;
}
cond_resched();
}
return deflated_frames;
}
/**
* vmballoon_deinit_batching - disables batching mode.
*
* @b: pointer to &struct vmballoon.
*
* Disables batching, by deallocating the page for communication with the
* hypervisor and disabling the static key to indicate that batching is off.
*/
static void vmballoon_deinit_batching(struct vmballoon *b)
{
free_page((unsigned long)b->batch_page);
b->batch_page = NULL;
static_branch_disable(&vmw_balloon_batching);
b->batch_max_pages = 1;
}
/**
* vmballoon_init_batching - enable batching mode.
*
* @b: pointer to &struct vmballoon.
*
* Enables batching, by allocating a page for communication with the hypervisor
* and enabling the static_key to use batching.
*
* Return: zero on success or an appropriate error-code.
*/
static int vmballoon_init_batching(struct vmballoon *b)
{
struct page *page;
page = alloc_page(GFP_KERNEL | __GFP_ZERO);
if (!page)
return -ENOMEM;
b->batch_page = page_address(page);
b->batch_max_pages = PAGE_SIZE / sizeof(struct vmballoon_batch_entry);
static_branch_enable(&vmw_balloon_batching);
return 0;
}
/*
* Receive notification and resize balloon
*/
static void vmballoon_doorbell(void *client_data)
{
struct vmballoon *b = client_data;
vmballoon_stats_gen_inc(b, VMW_BALLOON_STAT_DOORBELL);
mod_delayed_work(system_freezable_wq, &b->dwork, 0);
}
/*
* Clean up vmci doorbell
*/
static void vmballoon_vmci_cleanup(struct vmballoon *b)
{
vmballoon_cmd(b, VMW_BALLOON_CMD_VMCI_DOORBELL_SET,
VMCI_INVALID_ID, VMCI_INVALID_ID);
if (!vmci_handle_is_invalid(b->vmci_doorbell)) {
vmci_doorbell_destroy(b->vmci_doorbell);
b->vmci_doorbell = VMCI_INVALID_HANDLE;
}
}
/**
* vmballoon_vmci_init - Initialize vmci doorbell.
*
* @b: pointer to the balloon.
*
* Return: zero on success or when wakeup command not supported. Error-code
* otherwise.
*
* Initialize vmci doorbell, to get notified as soon as balloon changes.
*/
static int vmballoon_vmci_init(struct vmballoon *b)
{
unsigned long error;
if ((b->capabilities & VMW_BALLOON_SIGNALLED_WAKEUP_CMD) == 0)
return 0;
error = vmci_doorbell_create(&b->vmci_doorbell, VMCI_FLAG_DELAYED_CB,
VMCI_PRIVILEGE_FLAG_RESTRICTED,
vmballoon_doorbell, b);
if (error != VMCI_SUCCESS)
goto fail;
error = __vmballoon_cmd(b, VMW_BALLOON_CMD_VMCI_DOORBELL_SET,
b->vmci_doorbell.context,
b->vmci_doorbell.resource, NULL);
if (error != VMW_BALLOON_SUCCESS)
goto fail;
return 0;
fail:
vmballoon_vmci_cleanup(b);
return -EIO;
}
/**
* vmballoon_pop - Quickly release all pages allocate for the balloon.
*
* @b: pointer to the balloon.
*
* This function is called when host decides to "reset" balloon for one reason
* or another. Unlike normal "deflate" we do not (shall not) notify host of the
* pages being released.
*/
static void vmballoon_pop(struct vmballoon *b)
{
unsigned long size;
while ((size = atomic64_read(&b->size)))
vmballoon_deflate(b, size, false);
}
/*
* Perform standard reset sequence by popping the balloon (in case it
* is not empty) and then restarting protocol. This operation normally
* happens when host responds with VMW_BALLOON_ERROR_RESET to a command.
*/
static void vmballoon_reset(struct vmballoon *b)
{
int error;
down_write(&b->conf_sem);
vmballoon_vmci_cleanup(b);
/* free all pages, skipping monitor unlock */
vmballoon_pop(b);
if (vmballoon_send_start(b, VMW_BALLOON_CAPABILITIES))
goto unlock;
if ((b->capabilities & VMW_BALLOON_BATCHED_CMDS) != 0) {
if (vmballoon_init_batching(b)) {
/*
* We failed to initialize batching, inform the monitor
* about it by sending a null capability.
*
* The guest will retry in one second.
*/
vmballoon_send_start(b, 0);
goto unlock;
}
} else if ((b->capabilities & VMW_BALLOON_BASIC_CMDS) != 0) {
vmballoon_deinit_batching(b);
}
vmballoon_stats_gen_inc(b, VMW_BALLOON_STAT_RESET);
b->reset_required = false;
error = vmballoon_vmci_init(b);
if (error)
pr_err("failed to initialize vmci doorbell\n");
if (vmballoon_send_guest_id(b))
pr_err("failed to send guest ID to the host\n");
unlock:
up_write(&b->conf_sem);
}
/**
* vmballoon_work - periodic balloon worker for reset, inflation and deflation.
*
* @work: pointer to the &work_struct which is provided by the workqueue.
*
* Resets the protocol if needed, gets the new size and adjusts balloon as
* needed. Repeat in 1 sec.
*/
static void vmballoon_work(struct work_struct *work)
{
struct delayed_work *dwork = to_delayed_work(work);
struct vmballoon *b = container_of(dwork, struct vmballoon, dwork);
int64_t change = 0;
if (b->reset_required)
vmballoon_reset(b);
down_read(&b->conf_sem);
/*
* Update the stats while holding the semaphore to ensure that
* @stats_enabled is consistent with whether the stats are actually
* enabled
*/
vmballoon_stats_gen_inc(b, VMW_BALLOON_STAT_TIMER);
if (!vmballoon_send_get_target(b))
change = vmballoon_change(b);
if (change != 0) {
pr_debug("%s - size: %llu, target %lu\n", __func__,
atomic64_read(&b->size), READ_ONCE(b->target));
if (change > 0)
vmballoon_inflate(b);
else /* (change < 0) */
vmballoon_deflate(b, 0, true);
}
up_read(&b->conf_sem);
/*
* We are using a freezable workqueue so that balloon operations are
* stopped while the system transitions to/from sleep/hibernation.
*/
queue_delayed_work(system_freezable_wq,
dwork, round_jiffies_relative(HZ));
}
/*
* DEBUGFS Interface
*/
#ifdef CONFIG_DEBUG_FS
static const char * const vmballoon_stat_page_names[] = {
[VMW_BALLOON_PAGE_STAT_ALLOC] = "alloc",
[VMW_BALLOON_PAGE_STAT_ALLOC_FAIL] = "allocFail",
[VMW_BALLOON_PAGE_STAT_REFUSED_ALLOC] = "errAlloc",
[VMW_BALLOON_PAGE_STAT_REFUSED_FREE] = "errFree",
[VMW_BALLOON_PAGE_STAT_FREE] = "free"
};
static const char * const vmballoon_stat_names[] = {
[VMW_BALLOON_STAT_TIMER] = "timer",
[VMW_BALLOON_STAT_DOORBELL] = "doorbell",
[VMW_BALLOON_STAT_RESET] = "reset",
};
static int vmballoon_enable_stats(struct vmballoon *b)
{
int r = 0;
down_write(&b->conf_sem);
/* did we somehow race with another reader which enabled stats? */
if (b->stats)
goto out;
b->stats = kzalloc(sizeof(*b->stats), GFP_KERNEL);
if (!b->stats) {
/* allocation failed */
r = -ENOMEM;
goto out;
}
static_key_enable(&balloon_stat_enabled.key);
out:
up_write(&b->conf_sem);
return r;
}
/**
* vmballoon_debug_show - shows statistics of balloon operations.
* @f: pointer to the &struct seq_file.
* @offset: ignored.
*
* Provides the statistics that can be accessed in vmmemctl in the debugfs.
* To avoid the overhead - mainly that of memory - of collecting the statistics,
* we only collect statistics after the first time the counters are read.
*
* Return: zero on success or an error code.
*/
static int vmballoon_debug_show(struct seq_file *f, void *offset)
{
struct vmballoon *b = f->private;
int i, j;
/* enables stats if they are disabled */
if (!b->stats) {
int r = vmballoon_enable_stats(b);
if (r)
return r;
}
/* format capabilities info */
seq_printf(f, "%-22s: %#16x\n", "balloon capabilities",
VMW_BALLOON_CAPABILITIES);
seq_printf(f, "%-22s: %#16lx\n", "used capabilities", b->capabilities);
seq_printf(f, "%-22s: %16s\n", "is resetting",
b->reset_required ? "y" : "n");
/* format size info */
seq_printf(f, "%-22s: %16lu\n", "target", READ_ONCE(b->target));
seq_printf(f, "%-22s: %16llu\n", "current", atomic64_read(&b->size));
for (i = 0; i < VMW_BALLOON_CMD_NUM; i++) {
if (vmballoon_cmd_names[i] == NULL)
continue;
seq_printf(f, "%-22s: %16llu (%llu failed)\n",
vmballoon_cmd_names[i],
atomic64_read(&b->stats->ops[i][VMW_BALLOON_OP_STAT]),
atomic64_read(&b->stats->ops[i][VMW_BALLOON_OP_FAIL_STAT]));
}
for (i = 0; i < VMW_BALLOON_STAT_NUM; i++)
seq_printf(f, "%-22s: %16llu\n",
vmballoon_stat_names[i],
atomic64_read(&b->stats->general_stat[i]));
for (i = 0; i < VMW_BALLOON_PAGE_STAT_NUM; i++) {
for (j = 0; j < VMW_BALLOON_NUM_PAGE_SIZES; j++)
seq_printf(f, "%-18s(%s): %16llu\n",
vmballoon_stat_page_names[i],
vmballoon_page_size_names[j],
atomic64_read(&b->stats->page_stat[i][j]));
}
return 0;
}
DEFINE_SHOW_ATTRIBUTE(vmballoon_debug);
static int __init vmballoon_debugfs_init(struct vmballoon *b)
{
int error;
b->dbg_entry = debugfs_create_file("vmmemctl", S_IRUGO, NULL, b,
&vmballoon_debug_fops);
if (IS_ERR(b->dbg_entry)) {
error = PTR_ERR(b->dbg_entry);
pr_err("failed to create debugfs entry, error: %d\n", error);
return error;
}
return 0;
}
static void __exit vmballoon_debugfs_exit(struct vmballoon *b)
{
static_key_disable(&balloon_stat_enabled.key);
debugfs_remove(b->dbg_entry);
kfree(b->stats);
b->stats = NULL;
}
#else
static inline int vmballoon_debugfs_init(struct vmballoon *b)
{
return 0;
}
static inline void vmballoon_debugfs_exit(struct vmballoon *b)
{
}
#endif /* CONFIG_DEBUG_FS */
static int __init vmballoon_init(void)
{
enum vmballoon_page_size_type page_size;
int error;
/*
* Check if we are running on VMware's hypervisor and bail out
* if we are not.
*/
if (x86_hyper_type != X86_HYPER_VMWARE)
return -ENODEV;
for (page_size = VMW_BALLOON_4K_PAGE;
page_size <= VMW_BALLOON_LAST_SIZE; page_size++)
INIT_LIST_HEAD(&balloon.page_sizes[page_size].pages);
INIT_DELAYED_WORK(&balloon.dwork, vmballoon_work);
error = vmballoon_debugfs_init(&balloon);
if (error)
return error;
spin_lock_init(&balloon.comm_lock);
init_rwsem(&balloon.conf_sem);
balloon.vmci_doorbell = VMCI_INVALID_HANDLE;
balloon.batch_page = NULL;
balloon.page = NULL;
balloon.reset_required = true;
queue_delayed_work(system_freezable_wq, &balloon.dwork, 0);
return 0;
}
/*
* Using late_initcall() instead of module_init() allows the balloon to use the
* VMCI doorbell even when the balloon is built into the kernel. Otherwise the
* VMCI is probed only after the balloon is initialized. If the balloon is used
* as a module, late_initcall() is equivalent to module_init().
*/
late_initcall(vmballoon_init);
static void __exit vmballoon_exit(void)
{
vmballoon_vmci_cleanup(&balloon);
cancel_delayed_work_sync(&balloon.dwork);
vmballoon_debugfs_exit(&balloon);
/*
* Deallocate all reserved memory, and reset connection with monitor.
* Reset connection before deallocating memory to avoid potential for
* additional spurious resets from guest touching deallocated pages.
*/
vmballoon_send_start(&balloon, 0);
vmballoon_pop(&balloon);
}
module_exit(vmballoon_exit);