242 static struct msc_block_desc *msc_iter_bdesc(struct msc_iter *iter)  in msc_iter_bdesc()  argument
244 	return iter->win->block[iter->block].bdesc;  in msc_iter_bdesc()
247 static void msc_iter_init(struct msc_iter *iter)  in msc_iter_init()  argument
249 	memset(iter, 0, sizeof(*iter));  in msc_iter_init()
250 	iter->start_block = -1;  in msc_iter_init()
251 	iter->block = -1;  in msc_iter_init()
256 	struct msc_iter *iter;  in msc_iter_install()  local
258 	iter = kzalloc(sizeof(*iter), GFP_KERNEL);  in msc_iter_install()
259 	if (!iter)  in msc_iter_install()
262 	msc_iter_init(iter);  in msc_iter_install()
263 	iter->msc = msc;  in msc_iter_install()
266 	list_add_tail(&iter->entry, &msc->iter_list);  in msc_iter_install()
269 	return iter;  in msc_iter_install()
272 static void msc_iter_remove(struct msc_iter *iter, struct msc *msc)  in msc_iter_remove()  argument
275 	list_del(&iter->entry);  in msc_iter_remove()
278 	kfree(iter);  in msc_iter_remove()
281 static void msc_iter_block_start(struct msc_iter *iter)  in msc_iter_block_start()  argument
283 	if (iter->start_block != -1)  in msc_iter_block_start()
286 	iter->start_block = msc_win_oldest_block(iter->win);  in msc_iter_block_start()
287 	iter->block = iter->start_block;  in msc_iter_block_start()
288 	iter->wrap_count = 0;  in msc_iter_block_start()
294 	if (msc_block_wrapped(msc_iter_bdesc(iter)))  in msc_iter_block_start()
295 		iter->wrap_count = 2;  in msc_iter_block_start()
299 static int msc_iter_win_start(struct msc_iter *iter, struct msc *msc)  in msc_iter_win_start()  argument
302 	if (iter->start_win)  in msc_iter_win_start()
305 	iter->start_win = msc_oldest_window(msc);  in msc_iter_win_start()
306 	if (!iter->start_win)  in msc_iter_win_start()
309 	iter->win = iter->start_win;  in msc_iter_win_start()
310 	iter->start_block = -1;  in msc_iter_win_start()
312 	msc_iter_block_start(iter);  in msc_iter_win_start()
317 static int msc_iter_win_advance(struct msc_iter *iter)  in msc_iter_win_advance()  argument
319 	iter->win = msc_next_window(iter->win);  in msc_iter_win_advance()
320 	iter->start_block = -1;  in msc_iter_win_advance()
322 	if (iter->win == iter->start_win) {  in msc_iter_win_advance()
323 		iter->eof++;  in msc_iter_win_advance()
327 	msc_iter_block_start(iter);  in msc_iter_win_advance()
332 static int msc_iter_block_advance(struct msc_iter *iter)  in msc_iter_block_advance()  argument
334 	iter->block_off = 0;  in msc_iter_block_advance()
337 	if (iter->wrap_count && iter->block == iter->start_block) {  in msc_iter_block_advance()
338 		iter->wrap_count--;  in msc_iter_block_advance()
339 		if (!iter->wrap_count)  in msc_iter_block_advance()
341 			return msc_iter_win_advance(iter);  in msc_iter_block_advance()
345 	if (!iter->wrap_count && msc_block_last_written(msc_iter_bdesc(iter)))  in msc_iter_block_advance()
347 		return msc_iter_win_advance(iter);  in msc_iter_block_advance()
350 	if (++iter->block == iter->win->nr_blocks)  in msc_iter_block_advance()
351 		iter->block = 0;  in msc_iter_block_advance()
354 	if (!iter->wrap_count && iter->block == iter->start_block)  in msc_iter_block_advance()
355 		return msc_iter_win_advance(iter);  in msc_iter_block_advance()
377 msc_buffer_iterate(struct msc_iter *iter, size_t size, void *data,  in msc_buffer_iterate()  argument
380 	struct msc *msc = iter->msc;  in msc_buffer_iterate()
384 	if (iter->eof)  in msc_buffer_iterate()
388 	if (msc_iter_win_start(iter, msc))  in msc_buffer_iterate()
392 		unsigned long data_bytes = msc_data_sz(msc_iter_bdesc(iter));  in msc_buffer_iterate()
393 		void *src = (void *)msc_iter_bdesc(iter) + MSC_BDESC;  in msc_buffer_iterate()
411 		if (iter->block == iter->start_block && iter->wrap_count) {  in msc_buffer_iterate()
419 		tocopy -= iter->block_off;  in msc_buffer_iterate()
420 		src += iter->block_off;  in msc_buffer_iterate()
434 		iter->block_off += copied;  in msc_buffer_iterate()
435 		iter->offset += copied;  in msc_buffer_iterate()
441 		if (msc_iter_block_advance(iter))  in msc_buffer_iterate()
835 	struct msc_window *win, *iter;  in msc_buffer_multi_free()  local
837 	list_for_each_entry_safe(win, iter, &msc->win_list, entry)  in msc_buffer_multi_free()
1032 	struct msc_iter *iter;  in intel_th_msc_open()  local
1037 	iter = msc_iter_install(msc);  in intel_th_msc_open()
1038 	if (!iter)  in intel_th_msc_open()
1041 	file->private_data = iter;  in intel_th_msc_open()
1048 	struct msc_iter *iter = file->private_data;  in intel_th_msc_release()  local
1049 	struct msc *msc = iter->msc;  in intel_th_msc_release()
1051 	msc_iter_remove(iter, msc);  in intel_th_msc_release()
1095 	struct msc_iter *iter = file->private_data;  in intel_th_msc_read()  local
1096 	struct msc *msc = iter->msc;  in intel_th_msc_read()
1134 		ret = msc_buffer_iterate(iter, len, &u, msc_win_to_user);  in intel_th_msc_read()
1136 			*ppos = iter->offset;  in intel_th_msc_read()
1153 	struct msc_iter *iter = vma->vm_file->private_data;  in msc_mmap_open()  local
1154 	struct msc *msc = iter->msc;  in msc_mmap_open()
1161 	struct msc_iter *iter = vma->vm_file->private_data;  in msc_mmap_close()  local
1162 	struct msc *msc = iter->msc;  in msc_mmap_close()
1186 	struct msc_iter *iter = vma->vm_file->private_data;  in msc_mmap_fault()  local
1187 	struct msc *msc = iter->msc;  in msc_mmap_fault()
1209 	struct msc_iter *iter = vma->vm_file->private_data;  in intel_th_msc_mmap()  local
1210 	struct msc *msc = iter->msc;  in intel_th_msc_mmap()