235 static struct msc_block_desc *msc_iter_bdesc(struct msc_iter *iter)  in msc_iter_bdesc()  argument
237 	return iter->win->block[iter->block].bdesc;  in msc_iter_bdesc()
240 static void msc_iter_init(struct msc_iter *iter)  in msc_iter_init()  argument
242 	memset(iter, 0, sizeof(*iter));  in msc_iter_init()
243 	iter->start_block = -1;  in msc_iter_init()
244 	iter->block = -1;  in msc_iter_init()
249 	struct msc_iter *iter;  in msc_iter_install()  local
251 	iter = kzalloc(sizeof(*iter), GFP_KERNEL);  in msc_iter_install()
252 	if (!iter)  in msc_iter_install()
264 		kfree(iter);  in msc_iter_install()
265 		iter = ERR_PTR(-EBUSY);  in msc_iter_install()
269 	msc_iter_init(iter);  in msc_iter_install()
270 	iter->msc = msc;  in msc_iter_install()
272 	list_add_tail(&iter->entry, &msc->iter_list);  in msc_iter_install()
276 	return iter;  in msc_iter_install()
279 static void msc_iter_remove(struct msc_iter *iter, struct msc *msc)  in msc_iter_remove()  argument
282 	list_del(&iter->entry);  in msc_iter_remove()
285 	kfree(iter);  in msc_iter_remove()
288 static void msc_iter_block_start(struct msc_iter *iter)  in msc_iter_block_start()  argument
290 	if (iter->start_block != -1)  in msc_iter_block_start()
293 	iter->start_block = msc_win_oldest_block(iter->win);  in msc_iter_block_start()
294 	iter->block = iter->start_block;  in msc_iter_block_start()
295 	iter->wrap_count = 0;  in msc_iter_block_start()
301 	if (msc_block_wrapped(msc_iter_bdesc(iter)))  in msc_iter_block_start()
302 		iter->wrap_count = 2;  in msc_iter_block_start()
306 static int msc_iter_win_start(struct msc_iter *iter, struct msc *msc)  in msc_iter_win_start()  argument
309 	if (iter->start_win)  in msc_iter_win_start()
312 	iter->start_win = msc_oldest_window(msc);  in msc_iter_win_start()
313 	if (!iter->start_win)  in msc_iter_win_start()
316 	iter->win = iter->start_win;  in msc_iter_win_start()
317 	iter->start_block = -1;  in msc_iter_win_start()
319 	msc_iter_block_start(iter);  in msc_iter_win_start()
324 static int msc_iter_win_advance(struct msc_iter *iter)  in msc_iter_win_advance()  argument
326 	iter->win = msc_next_window(iter->win);  in msc_iter_win_advance()
327 	iter->start_block = -1;  in msc_iter_win_advance()
329 	if (iter->win == iter->start_win) {  in msc_iter_win_advance()
330 		iter->eof++;  in msc_iter_win_advance()
334 	msc_iter_block_start(iter);  in msc_iter_win_advance()
339 static int msc_iter_block_advance(struct msc_iter *iter)  in msc_iter_block_advance()  argument
341 	iter->block_off = 0;  in msc_iter_block_advance()
344 	if (iter->wrap_count && iter->block == iter->start_block) {  in msc_iter_block_advance()
345 		iter->wrap_count--;  in msc_iter_block_advance()
346 		if (!iter->wrap_count)  in msc_iter_block_advance()
348 			return msc_iter_win_advance(iter);  in msc_iter_block_advance()
352 	if (!iter->wrap_count && msc_block_last_written(msc_iter_bdesc(iter)))  in msc_iter_block_advance()
354 		return msc_iter_win_advance(iter);  in msc_iter_block_advance()
357 	if (++iter->block == iter->win->nr_blocks)  in msc_iter_block_advance()
358 		iter->block = 0;  in msc_iter_block_advance()
361 	if (!iter->wrap_count && iter->block == iter->start_block)  in msc_iter_block_advance()
362 		return msc_iter_win_advance(iter);  in msc_iter_block_advance()
384 msc_buffer_iterate(struct msc_iter *iter, size_t size, void *data,  in msc_buffer_iterate()  argument
387 	struct msc *msc = iter->msc;  in msc_buffer_iterate()
391 	if (iter->eof)  in msc_buffer_iterate()
395 	if (msc_iter_win_start(iter, msc))  in msc_buffer_iterate()
399 		unsigned long data_bytes = msc_data_sz(msc_iter_bdesc(iter));  in msc_buffer_iterate()
400 		void *src = (void *)msc_iter_bdesc(iter) + MSC_BDESC;  in msc_buffer_iterate()
418 		if (iter->block == iter->start_block && iter->wrap_count == 2) {  in msc_buffer_iterate()
426 		tocopy -= iter->block_off;  in msc_buffer_iterate()
427 		src += iter->block_off;  in msc_buffer_iterate()
441 		iter->block_off += copied;  in msc_buffer_iterate()
442 		iter->offset += copied;  in msc_buffer_iterate()
448 		if (msc_iter_block_advance(iter))  in msc_buffer_iterate()
842 	struct msc_window *win, *iter;  in msc_buffer_multi_free()  local
844 	list_for_each_entry_safe(win, iter, &msc->win_list, entry)  in msc_buffer_multi_free()
1039 	struct msc_iter *iter;  in intel_th_msc_open()  local
1044 	iter = msc_iter_install(msc);  in intel_th_msc_open()
1045 	if (IS_ERR(iter))  in intel_th_msc_open()
1046 		return PTR_ERR(iter);  in intel_th_msc_open()
1048 	file->private_data = iter;  in intel_th_msc_open()
1055 	struct msc_iter *iter = file->private_data;  in intel_th_msc_release()  local
1056 	struct msc *msc = iter->msc;  in intel_th_msc_release()
1058 	msc_iter_remove(iter, msc);  in intel_th_msc_release()
1102 	struct msc_iter *iter = file->private_data;  in intel_th_msc_read()  local
1103 	struct msc *msc = iter->msc;  in intel_th_msc_read()
1135 		ret = msc_buffer_iterate(iter, len, &u, msc_win_to_user);  in intel_th_msc_read()
1137 			*ppos = iter->offset;  in intel_th_msc_read()
1154 	struct msc_iter *iter = vma->vm_file->private_data;  in msc_mmap_open()  local
1155 	struct msc *msc = iter->msc;  in msc_mmap_open()
1162 	struct msc_iter *iter = vma->vm_file->private_data;  in msc_mmap_close()  local
1163 	struct msc *msc = iter->msc;  in msc_mmap_close()
1187 	struct msc_iter *iter = vmf->vma->vm_file->private_data;  in msc_mmap_fault()  local
1188 	struct msc *msc = iter->msc;  in msc_mmap_fault()
1210 	struct msc_iter *iter = vma->vm_file->private_data;  in intel_th_msc_mmap()  local
1211 	struct msc *msc = iter->msc;  in intel_th_msc_mmap()