#include <linux/kernel.h>
#include <linux/jiffies.h>
#include <linux/mman.h>
+#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/module.h>
* num_committed: Committed memory in pages.
* page_file_size: The accumulated size of all page files
* in the system in pages.
- * zero_free: The nunber of zero and free pages.
+ * zero_free: The number of zero and free pages.
* page_file_writes: The writes to the page file in pages.
* io_diff: An indicator of file cache efficiency or page file activity,
* calculated as File Cache Page Fault Count - Page Read Count.
__u32 version;
struct page_reporting_dev_info pr_dev_info;
+
+ /*
+ * Maximum number of pages that can be hot_add-ed
+ */
+ __u64 max_dynamic_page_count;
};
static struct hv_dynmem_device dm_device;
pr_info("Max. dynamic memory size: %llu MB\n",
(*max_page_count) >> (20 - HV_HYP_PAGE_SHIFT));
+ dm->max_dynamic_page_count = *max_page_count;
}
break;
}
/*
+ * Compute total committed memory pages
+ */
+
+static unsigned long get_pages_committed(struct hv_dynmem_device *dm)
+{
+ return vm_memory_committed() +
+ dm->num_pages_ballooned +
+ (dm->num_pages_added > dm->num_pages_onlined ?
+ dm->num_pages_added - dm->num_pages_onlined : 0) +
+ compute_balloon_floor();
+}
+
+/*
* Post our status as it relates memory pressure to the
* host. Host expects the guests to post this status
* periodically at 1 second intervals.
* asking us to balloon them out.
*/
num_pages_avail = si_mem_available();
- num_pages_committed = vm_memory_committed() +
- dm->num_pages_ballooned +
- (dm->num_pages_added > dm->num_pages_onlined ?
- dm->num_pages_added - dm->num_pages_onlined : 0) +
- compute_balloon_floor();
+ num_pages_committed = get_pages_committed(dm);
trace_balloon_status(num_pages_avail, num_pages_committed,
vm_memory_committed(), dm->num_pages_ballooned,
return ret;
}
+/*
+ * DEBUGFS Interface
+ */
+#ifdef CONFIG_DEBUG_FS
+
+/**
+ * hv_balloon_debug_show - shows statistics of balloon operations.
+ * @f: pointer to the &struct seq_file.
+ * @offset: ignored.
+ *
+ * Provides the statistics that can be accessed in hv-balloon in the debugfs.
+ *
+ * Return: zero on success or an error code.
+ */
+static int hv_balloon_debug_show(struct seq_file *f, void *offset)
+{
+ struct hv_dynmem_device *dm = f->private;
+ char *sname;
+
+ seq_printf(f, "%-22s: %u.%u\n", "host_version",
+ DYNMEM_MAJOR_VERSION(dm->version),
+ DYNMEM_MINOR_VERSION(dm->version));
+
+ seq_printf(f, "%-22s:", "capabilities");
+ if (ballooning_enabled())
+ seq_puts(f, " enabled");
+
+ if (hot_add_enabled())
+ seq_puts(f, " hot_add");
+
+ seq_puts(f, "\n");
+
+ seq_printf(f, "%-22s: %u", "state", dm->state);
+ switch (dm->state) {
+ case DM_INITIALIZING:
+ sname = "Initializing";
+ break;
+ case DM_INITIALIZED:
+ sname = "Initialized";
+ break;
+ case DM_BALLOON_UP:
+ sname = "Balloon Up";
+ break;
+ case DM_BALLOON_DOWN:
+ sname = "Balloon Down";
+ break;
+ case DM_HOT_ADD:
+ sname = "Hot Add";
+ break;
+ case DM_INIT_ERROR:
+ sname = "Error";
+ break;
+ default:
+ sname = "Unknown";
+ }
+ seq_printf(f, " (%s)\n", sname);
+
+ /* HV Page Size */
+ seq_printf(f, "%-22s: %ld\n", "page_size", HV_HYP_PAGE_SIZE);
+
+ /* Pages added with hot_add */
+ seq_printf(f, "%-22s: %u\n", "pages_added", dm->num_pages_added);
+
+ /* pages that are "onlined"/used from pages_added */
+ seq_printf(f, "%-22s: %u\n", "pages_onlined", dm->num_pages_onlined);
+
+ /* pages we have given back to host */
+ seq_printf(f, "%-22s: %u\n", "pages_ballooned", dm->num_pages_ballooned);
+
+ seq_printf(f, "%-22s: %lu\n", "total_pages_committed",
+ get_pages_committed(dm));
+
+ seq_printf(f, "%-22s: %llu\n", "max_dynamic_page_count",
+ dm->max_dynamic_page_count);
+
+ return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(hv_balloon_debug);
+
+static void hv_balloon_debugfs_init(struct hv_dynmem_device *b)
+{
+ debugfs_create_file("hv-balloon", 0444, NULL, b,
+ &hv_balloon_debug_fops);
+}
+
+static void hv_balloon_debugfs_exit(struct hv_dynmem_device *b)
+{
+ debugfs_remove(debugfs_lookup("hv-balloon", NULL));
+}
+
+#else
+
+static inline void hv_balloon_debugfs_init(struct hv_dynmem_device *b)
+{
+}
+
+static inline void hv_balloon_debugfs_exit(struct hv_dynmem_device *b)
+{
+}
+
+#endif /* CONFIG_DEBUG_FS */
+
static int balloon_probe(struct hv_device *dev,
const struct hv_vmbus_device_id *dev_id)
{
goto probe_error;
}
+ hv_balloon_debugfs_init(&dm_device);
+
return 0;
probe_error:
if (dm->num_pages_ballooned != 0)
pr_warn("Ballooned pages: %d\n", dm->num_pages_ballooned);
+ hv_balloon_debugfs_exit(dm);
+
cancel_work_sync(&dm->balloon_wrk.wrk);
cancel_work_sync(&dm->ha_wrk.wrk);
* work queue: the RESCIND handler can not start to
* run before the OFFER handler finishes.
*/
- schedule_work(&ctx->work);
+ if (vmbus_connection.ignore_any_offer_msg)
+ break;
+ queue_work(vmbus_connection.rescind_work_queue, &ctx->work);
break;
case CHANNELMSG_OFFERCHANNEL:
* to the CPUs which will execute the offer & rescind
* works by the time these works will start execution.
*/
+ if (vmbus_connection.ignore_any_offer_msg)
+ break;
atomic_inc(&vmbus_connection.offer_in_progress);
fallthrough;
#ifdef CONFIG_PM_SLEEP
static int vmbus_bus_suspend(struct device *dev)
{
+ struct hv_per_cpu_context *hv_cpu = per_cpu_ptr(
+ hv_context.cpu_context, VMBUS_CONNECT_CPU);
struct vmbus_channel *channel, *sc;
- while (atomic_read(&vmbus_connection.offer_in_progress) != 0) {
- /*
- * We wait here until the completion of any channel
- * offers that are currently in progress.
- */
- usleep_range(1000, 2000);
- }
+ tasklet_disable(&hv_cpu->msg_dpc);
+ vmbus_connection.ignore_any_offer_msg = true;
+ /* The tasklet_enable() takes care of providing a memory barrier */
+ tasklet_enable(&hv_cpu->msg_dpc);
+
+ /* Drain all the workqueues as we are in suspend */
+ drain_workqueue(vmbus_connection.rescind_work_queue);
+ drain_workqueue(vmbus_connection.work_queue);
+ drain_workqueue(vmbus_connection.handle_primary_chan_wq);
+ drain_workqueue(vmbus_connection.handle_sub_chan_wq);
mutex_lock(&vmbus_connection.channel_mutex);
list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
size_t msgsize;
int ret;
+ vmbus_connection.ignore_any_offer_msg = false;
+
/*
* We only use the 'vmbus_proto_version', which was in use before
* hibernation, to re-negotiate with the host.