Adapt lttng-modules to Linux 4.10 cpu hotplug state machine

[lttng-modules.git] / lib / ringbuffer / backend_types.h

diff --git a/lib/ringbuffer/backend_types.h b/lib/ringbuffer/backend_types.h
index 1577c812bb93c1df71cb5f736d8c1de6c8a933f6..01ed63b9349aac0a71f25d4912774c7f946e9854 100644 (file)
--- a/lib/ringbuffer/backend_types.h
+++ b/lib/ringbuffer/backend_types.h
@@ -25,10 +25,12 @@
 
 #include <linux/cpumask.h>
 #include <linux/types.h>
+#include <lttng-kernel-version.h>
+#include <lttng-cpuhotplug.h>
 
 struct lib_ring_buffer_backend_page {
        void *virt;                     /* page virtual address (cached) */
-       struct page *page;              /* pointer to page structure */
+       unsigned long pfn;              /* page frame number */
 };
 
 struct lib_ring_buffer_backend_pages {
@@ -44,6 +46,16 @@ struct lib_ring_buffer_backend_subbuffer {
        unsigned long id;               /* backend subbuffer identifier */
 };
 
+struct lib_ring_buffer_backend_counts {
+       /*
+        * Counter specific to the sub-buffer location within the ring buffer.
+        * The actual sequence number of the packet within the entire ring
+        * buffer can be derived from the formula nr_subbuffers * seq_cnt +
+        * subbuf_idx.
+        */
+       uint64_t seq_cnt;               /* packet sequence number */
+};
+
 /*
  * Forward declaration of frontend-specific channel and ring_buffer.
  */
@@ -55,6 +67,8 @@ struct lib_ring_buffer_backend {
        struct lib_ring_buffer_backend_subbuffer *buf_wsb;
        /* ring_buffer_backend_subbuffer for reader */
        struct lib_ring_buffer_backend_subbuffer buf_rsb;
+       /* Array of lib_ring_buffer_backend_counts for the packet counter */
+       struct lib_ring_buffer_backend_counts *buf_cnt;
        /*
         * Pointer array of backend pages, for whole buffer.
         * Indexed by ring_buffer_backend_subbuffer identifier (id) index.
@@ -85,7 +99,11 @@ struct channel_backend {
        void *priv;                     /* Client-specific information */
        void *priv_ops;                 /* Client-specific ops pointer */
        void (*release_priv_ops)(void *priv_ops);
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,10,0))
+       struct lttng_cpuhp_node cpuhp_prepare;  /* CPU hotplug prepare */
+#else
        struct notifier_block cpu_hp_notifier;   /* CPU hotplug notifier */
+#endif
        /*
         * We need to copy config because the module containing the
         * source config can vanish before the last reference to this