From 8d91c1e411f55d7ea91b1183a2e9f8088fb4d5be Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Tue, 15 Dec 2015 14:52:16 -0300 Subject: Linux-libre 4.3.2-gnu --- drivers/misc/vmw_balloon.c | 170 ++++++++++++++++++++++----------------------- 1 file changed, 85 insertions(+), 85 deletions(-) (limited to 'drivers/misc/vmw_balloon.c') diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c index 191617492..ffb56340d 100644 --- a/drivers/misc/vmw_balloon.c +++ b/drivers/misc/vmw_balloon.c @@ -46,7 +46,7 @@ MODULE_AUTHOR("VMware, Inc."); MODULE_DESCRIPTION("VMware Memory Control (Balloon) Driver"); -MODULE_VERSION("1.2.1.3-k"); +MODULE_VERSION("1.3.0.0-k"); MODULE_ALIAS("dmi:*:svnVMware*:*"); MODULE_ALIAS("vmware_vmmemctl"); MODULE_LICENSE("GPL"); @@ -110,9 +110,18 @@ MODULE_LICENSE("GPL"); */ #define VMW_BALLOON_HV_PORT 0x5670 #define VMW_BALLOON_HV_MAGIC 0x456c6d6f -#define VMW_BALLOON_PROTOCOL_VERSION 2 #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) +}; + +#define VMW_BALLOON_CAPABILITIES (VMW_BALLOON_BASIC_CMDS) + #define VMW_BALLOON_CMD_START 0 #define VMW_BALLOON_CMD_GET_TARGET 1 #define VMW_BALLOON_CMD_LOCK 2 @@ -120,32 +129,36 @@ MODULE_LICENSE("GPL"); #define VMW_BALLOON_CMD_GUEST_ID 4 /* error codes */ -#define VMW_BALLOON_SUCCESS 0 -#define VMW_BALLOON_FAILURE -1 -#define VMW_BALLOON_ERROR_CMD_INVALID 1 -#define VMW_BALLOON_ERROR_PPN_INVALID 2 -#define VMW_BALLOON_ERROR_PPN_LOCKED 3 -#define VMW_BALLOON_ERROR_PPN_UNLOCKED 4 -#define VMW_BALLOON_ERROR_PPN_PINNED 5 -#define VMW_BALLOON_ERROR_PPN_NOTNEEDED 6 -#define VMW_BALLOON_ERROR_RESET 7 -#define VMW_BALLOON_ERROR_BUSY 8 - -#define VMWARE_BALLOON_CMD(cmd, data, result) \ -({ \ - unsigned long __stat, __dummy1, __dummy2; \ - __asm__ __volatile__ ("inl %%dx" : \ - "=a"(__stat), \ - "=c"(__dummy1), \ - "=d"(__dummy2), \ - "=b"(result) : \ - "0"(VMW_BALLOON_HV_MAGIC), \ - "1"(VMW_BALLOON_CMD_##cmd), \ - "2"(VMW_BALLOON_HV_PORT), \ - "3"(data) : \ - "memory"); \ - result &= -1UL; \ - __stat & -1UL; \ +#define VMW_BALLOON_SUCCESS 0 +#define VMW_BALLOON_FAILURE -1 +#define VMW_BALLOON_ERROR_CMD_INVALID 1 +#define VMW_BALLOON_ERROR_PPN_INVALID 2 +#define VMW_BALLOON_ERROR_PPN_LOCKED 3 +#define VMW_BALLOON_ERROR_PPN_UNLOCKED 4 +#define VMW_BALLOON_ERROR_PPN_PINNED 5 +#define VMW_BALLOON_ERROR_PPN_NOTNEEDED 6 +#define VMW_BALLOON_ERROR_RESET 7 +#define VMW_BALLOON_ERROR_BUSY 8 + +#define VMW_BALLOON_SUCCESS_WITH_CAPABILITIES (0x03000000) + +#define VMWARE_BALLOON_CMD(cmd, data, result) \ +({ \ + unsigned long __status, __dummy1, __dummy2; \ + __asm__ __volatile__ ("inl %%dx" : \ + "=a"(__status), \ + "=c"(__dummy1), \ + "=d"(__dummy2), \ + "=b"(result) : \ + "0"(VMW_BALLOON_HV_MAGIC), \ + "1"(VMW_BALLOON_CMD_##cmd), \ + "2"(VMW_BALLOON_HV_PORT), \ + "3"(data) : \ + "memory"); \ + if (VMW_BALLOON_CMD_##cmd == VMW_BALLOON_CMD_START) \ + result = __dummy1; \ + result &= -1UL; \ + __status & -1UL; \ }) #ifdef CONFIG_DEBUG_FS @@ -223,11 +236,12 @@ static struct vmballoon balloon; */ static bool vmballoon_send_start(struct vmballoon *b) { - unsigned long status, dummy; + unsigned long status, capabilities; STATS_INC(b->stats.start); - status = VMWARE_BALLOON_CMD(START, VMW_BALLOON_PROTOCOL_VERSION, dummy); + status = VMWARE_BALLOON_CMD(START, VMW_BALLOON_CAPABILITIES, + capabilities); if (status == VMW_BALLOON_SUCCESS) return true; @@ -402,55 +416,37 @@ static void vmballoon_reset(struct vmballoon *b) } /* - * Allocate (or reserve) a page for the balloon and notify the host. If host - * refuses the page put it on "refuse" list and allocate another one until host - * is satisfied. "Refused" pages are released at the end of inflation cycle - * (when we allocate b->rate_alloc pages). + * Notify the host of a ballooned page. If host rejects the page put it on the + * refuse list, those refused page are then released at the end of the + * inflation cycle. */ -static int vmballoon_reserve_page(struct vmballoon *b, bool can_sleep) +static int vmballoon_lock_page(struct vmballoon *b, struct page *page) { - struct page *page; - gfp_t flags; - unsigned int hv_status; - int locked; - flags = can_sleep ? VMW_PAGE_ALLOC_CANSLEEP : VMW_PAGE_ALLOC_NOSLEEP; - - do { - if (!can_sleep) - STATS_INC(b->stats.alloc); - else - STATS_INC(b->stats.sleep_alloc); + int locked, hv_status; - page = alloc_page(flags); - if (!page) { - if (!can_sleep) - STATS_INC(b->stats.alloc_fail); - else - STATS_INC(b->stats.sleep_alloc_fail); - return -ENOMEM; - } + locked = vmballoon_send_lock_page(b, page_to_pfn(page), &hv_status); + if (locked > 0) { + STATS_INC(b->stats.refused_alloc); - /* inform monitor */ - locked = vmballoon_send_lock_page(b, page_to_pfn(page), &hv_status); - if (locked > 0) { - STATS_INC(b->stats.refused_alloc); - - if (hv_status == VMW_BALLOON_ERROR_RESET || - hv_status == VMW_BALLOON_ERROR_PPN_NOTNEEDED) { - __free_page(page); - return -EIO; - } + if (hv_status == VMW_BALLOON_ERROR_RESET || + hv_status == VMW_BALLOON_ERROR_PPN_NOTNEEDED) { + __free_page(page); + return -EIO; + } - /* - * Place page on the list of non-balloonable pages - * and retry allocation, unless we already accumulated - * too many of them, in which case take a breather. - */ + /* + * Place page on the list of non-balloonable pages + * and retry allocation, unless we already accumulated + * too many of them, in which case take a breather. + */ + if (b->n_refused_pages < VMW_BALLOON_MAX_REFUSED) { + b->n_refused_pages++; list_add(&page->lru, &b->refused_pages); - if (++b->n_refused_pages >= VMW_BALLOON_MAX_REFUSED) - return -EIO; + } else { + __free_page(page); } - } while (locked != 0); + return -EIO; + } /* track allocated page */ list_add(&page->lru, &b->pages); @@ -512,7 +508,7 @@ static void vmballoon_inflate(struct vmballoon *b) unsigned int i; unsigned int allocations = 0; int error = 0; - bool alloc_can_sleep = false; + gfp_t flags = VMW_PAGE_ALLOC_NOSLEEP; pr_debug("%s - size: %d, target %d\n", __func__, b->size, b->target); @@ -543,19 +539,16 @@ static void vmballoon_inflate(struct vmballoon *b) __func__, goal, rate, b->rate_alloc); for (i = 0; i < goal; i++) { + struct page *page; - error = vmballoon_reserve_page(b, alloc_can_sleep); - if (error) { - if (error != -ENOMEM) { - /* - * Not a page allocation failure, stop this - * cycle. Maybe we'll get new target from - * the host soon. - */ - break; - } + if (flags == VMW_PAGE_ALLOC_NOSLEEP) + STATS_INC(b->stats.alloc); + else + STATS_INC(b->stats.sleep_alloc); - if (alloc_can_sleep) { + page = alloc_page(flags); + if (!page) { + if (flags == VMW_PAGE_ALLOC_CANSLEEP) { /* * CANSLEEP page allocation failed, so guest * is under severe memory pressure. Quickly @@ -563,8 +556,10 @@ static void vmballoon_inflate(struct vmballoon *b) */ b->rate_alloc = max(b->rate_alloc / 2, VMW_BALLOON_RATE_ALLOC_MIN); + STATS_INC(b->stats.sleep_alloc_fail); break; } + STATS_INC(b->stats.alloc_fail); /* * NOSLEEP page allocation failed, so the guest is @@ -579,11 +574,16 @@ static void vmballoon_inflate(struct vmballoon *b) if (i >= b->rate_alloc) break; - alloc_can_sleep = true; + flags = VMW_PAGE_ALLOC_CANSLEEP; /* Lower rate for sleeping allocations. */ rate = b->rate_alloc; + continue; } + error = vmballoon_lock_page(b, page); + if (error) + break; + if (++allocations > VMW_BALLOON_YIELD_THRESHOLD) { cond_resched(); allocations = 0; -- cgit v1.2.3-54-g00ecf