Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 246 insertions, 0 deletions

diff --git a/kernel/events/internal.h b/kernel/events/internal.h
new file mode 100644
index 0000000000..5150d5f84c
--- /dev/null
+++ b/kernel/events/internal.h
@@ -0,0 +1,246 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _KERNEL_EVENTS_INTERNAL_H
+#define _KERNEL_EVENTS_INTERNAL_H
+
+#include <linux/hardirq.h>
+#include <linux/uaccess.h>
+#include <linux/refcount.h>
+
+/* Buffer handling */
+
+#define RING_BUFFER_WRITABLE		0x01
+
+struct perf_buffer {
+	refcount_t			refcount;
+	struct rcu_head			rcu_head;
+#ifdef CONFIG_PERF_USE_VMALLOC
+	struct work_struct		work;
+	int				page_order;	/* allocation order  */
+#endif
+	int				nr_pages;	/* nr of data pages  */
+	int				overwrite;	/* can overwrite itself */
+	int				paused;		/* can write into ring buffer */
+
+	atomic_t			poll;		/* POLL_ for wakeups */
+
+	local_t				head;		/* write position    */
+	unsigned int			nest;		/* nested writers    */
+	local_t				events;		/* event limit       */
+	local_t				wakeup;		/* wakeup stamp      */
+	local_t				lost;		/* nr records lost   */
+
+	long				watermark;	/* wakeup watermark  */
+	long				aux_watermark;
+	/* poll crap */
+	spinlock_t			event_lock;
+	struct list_head		event_list;
+
+	atomic_t			mmap_count;
+	unsigned long			mmap_locked;
+	struct user_struct		*mmap_user;
+
+	/* AUX area */
+	long				aux_head;
+	unsigned int			aux_nest;
+	long				aux_wakeup;	/* last aux_watermark boundary crossed by aux_head */
+	unsigned long			aux_pgoff;
+	int				aux_nr_pages;
+	int				aux_overwrite;
+	atomic_t			aux_mmap_count;
+	unsigned long			aux_mmap_locked;
+	void				(*free_aux)(void *);
+	refcount_t			aux_refcount;
+	int				aux_in_sampling;
+	void				**aux_pages;
+	void				*aux_priv;
+
+	struct perf_event_mmap_page	*user_page;
+	void				*data_pages[];
+};
+
+extern void rb_free(struct perf_buffer *rb);
+
+static inline void rb_free_rcu(struct rcu_head *rcu_head)
+{
+	struct perf_buffer *rb;
+
+	rb = container_of(rcu_head, struct perf_buffer, rcu_head);
+	rb_free(rb);
+}
+
+static inline void rb_toggle_paused(struct perf_buffer *rb, bool pause)
+{
+	if (!pause && rb->nr_pages)
+		rb->paused = 0;
+	else
+		rb->paused = 1;
+}
+
+extern struct perf_buffer *
+rb_alloc(int nr_pages, long watermark, int cpu, int flags);
+extern void perf_event_wakeup(struct perf_event *event);
+extern int rb_alloc_aux(struct perf_buffer *rb, struct perf_event *event,
+			pgoff_t pgoff, int nr_pages, long watermark, int flags);
+extern void rb_free_aux(struct perf_buffer *rb);
+extern struct perf_buffer *ring_buffer_get(struct perf_event *event);
+extern void ring_buffer_put(struct perf_buffer *rb);
+
+static inline bool rb_has_aux(struct perf_buffer *rb)
+{
+	return !!rb->aux_nr_pages;
+}
+
+void perf_event_aux_event(struct perf_event *event, unsigned long head,
+			  unsigned long size, u64 flags);
+
+extern struct page *
+perf_mmap_to_page(struct perf_buffer *rb, unsigned long pgoff);
+
+#ifdef CONFIG_PERF_USE_VMALLOC
+/*
+ * Back perf_mmap() with vmalloc memory.
+ *
+ * Required for architectures that have d-cache aliasing issues.
+ */
+
+static inline int page_order(struct perf_buffer *rb)
+{
+	return rb->page_order;
+}
+
+#else
+
+static inline int page_order(struct perf_buffer *rb)
+{
+	return 0;
+}
+#endif
+
+static inline int data_page_nr(struct perf_buffer *rb)
+{
+	return rb->nr_pages << page_order(rb);
+}
+
+static inline unsigned long perf_data_size(struct perf_buffer *rb)
+{
+	return rb->nr_pages << (PAGE_SHIFT + page_order(rb));
+}
+
+static inline unsigned long perf_aux_size(struct perf_buffer *rb)
+{
+	return rb->aux_nr_pages << PAGE_SHIFT;
+}
+
+#define __DEFINE_OUTPUT_COPY_BODY(advance_buf, memcpy_func, ...)	\
+{									\
+	unsigned long size, written;					\
+									\
+	do {								\
+		size    = min(handle->size, len);			\
+		written = memcpy_func(__VA_ARGS__);			\
+		written = size - written;				\
+									\
+		len -= written;						\
+		handle->addr += written;				\
+		if (advance_buf)					\
+			buf += written;					\
+		handle->size -= written;				\
+		if (!handle->size) {					\
+			struct perf_buffer *rb = handle->rb;	\
+									\
+			handle->page++;					\
+			handle->page &= rb->nr_pages - 1;		\
+			handle->addr = rb->data_pages[handle->page];	\
+			handle->size = PAGE_SIZE << page_order(rb);	\
+		}							\
+	} while (len && written == size);				\
+									\
+	return len;							\
+}
+
+#define DEFINE_OUTPUT_COPY(func_name, memcpy_func)			\
+static inline unsigned long						\
+func_name(struct perf_output_handle *handle,				\
+	  const void *buf, unsigned long len)				\
+__DEFINE_OUTPUT_COPY_BODY(true, memcpy_func, handle->addr, buf, size)
+
+static inline unsigned long
+__output_custom(struct perf_output_handle *handle, perf_copy_f copy_func,
+		const void *buf, unsigned long len)
+{
+	unsigned long orig_len = len;
+	__DEFINE_OUTPUT_COPY_BODY(false, copy_func, handle->addr, buf,
+				  orig_len - len, size)
+}
+
+static inline unsigned long
+memcpy_common(void *dst, const void *src, unsigned long n)
+{
+	memcpy(dst, src, n);
+	return 0;
+}
+
+DEFINE_OUTPUT_COPY(__output_copy, memcpy_common)
+
+static inline unsigned long
+memcpy_skip(void *dst, const void *src, unsigned long n)
+{
+	return 0;
+}
+
+DEFINE_OUTPUT_COPY(__output_skip, memcpy_skip)
+
+#ifndef arch_perf_out_copy_user
+#define arch_perf_out_copy_user arch_perf_out_copy_user
+
+static inline unsigned long
+arch_perf_out_copy_user(void *dst, const void *src, unsigned long n)
+{
+	unsigned long ret;
+
+	pagefault_disable();
+	ret = __copy_from_user_inatomic(dst, src, n);
+	pagefault_enable();
+
+	return ret;
+}
+#endif
+
+DEFINE_OUTPUT_COPY(__output_copy_user, arch_perf_out_copy_user)
+
+static inline int get_recursion_context(int *recursion)
+{
+	unsigned char rctx = interrupt_context_level();
+
+	if (recursion[rctx])
+		return -1;
+
+	recursion[rctx]++;
+	barrier();
+
+	return rctx;
+}
+
+static inline void put_recursion_context(int *recursion, int rctx)
+{
+	barrier();
+	recursion[rctx]--;
+}
+
+#ifdef CONFIG_HAVE_PERF_USER_STACK_DUMP
+static inline bool arch_perf_have_user_stack_dump(void)
+{
+	return true;
+}
+
+#define perf_user_stack_pointer(regs) user_stack_pointer(regs)
+#else
+static inline bool arch_perf_have_user_stack_dump(void)
+{
+	return false;
+}
+
+#define perf_user_stack_pointer(regs) 0
+#endif /* CONFIG_HAVE_PERF_USER_STACK_DUMP */
+
+#endif /* _KERNEL_EVENTS_INTERNAL_H */