From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:32930) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UrRC6-0006yj-6O for qemu-devel@nongnu.org; Tue, 25 Jun 2013 07:13:55 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UrRC5-0000Do-1S for qemu-devel@nongnu.org; Tue, 25 Jun 2013 07:13:54 -0400 Received: from mail-ea0-x234.google.com ([2a00:1450:4013:c01::234]:46958) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UrRC4-0000Db-K6 for qemu-devel@nongnu.org; Tue, 25 Jun 2013 07:13:52 -0400 Received: by mail-ea0-f180.google.com with SMTP id k10so6756137eaj.25 for ; Tue, 25 Jun 2013 04:13:52 -0700 (PDT) Sender: Paolo Bonzini From: Paolo Bonzini Date: Tue, 25 Jun 2013 13:13:21 +0200 Message-Id: <1372158807-19715-6-git-send-email-pbonzini@redhat.com> In-Reply-To: <1372158807-19715-1-git-send-email-pbonzini@redhat.com> References: <1372158807-19715-1-git-send-email-pbonzini@redhat.com> Subject: [Qemu-devel] [PATCH 05/11] memory: add ref/unref List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: peter.maydell@linaro.org Signed-off-by: Paolo Bonzini --- include/exec/memory.h | 30 ++++++++++++++++++++++++++++++ memory.c | 14 ++++++++++++++ 2 files changed, 44 insertions(+) diff --git a/include/exec/memory.h b/include/exec/memory.h index 763297e..c842d48 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -270,6 +270,36 @@ void memory_region_init(MemoryRegion *mr, struct Object *owner, const char *name, uint64_t size); + +/** + * memory_region_ref: Add 1 to a memory region's reference count + * + * Whenever memory regions are accessed outside the BQL, they need to be + * preserved against hot-unplug. MemoryRegions actually do not have their + * own reference count; they piggyback on a QOM object, their "owner". + * This function adds a reference to the owner. + * + * All MemoryRegions must have an owner if they can disappear, even if the + * device they belong to operates exclusively under the BQL. This is because + * the region could be returned at any time by memory_region_find, and this + * is usually under guest control. + * + * @mr: the #MemoryRegion + */ +void memory_region_ref(MemoryRegion *mr); + +/** + * memory_region_unref: Remove 1 to a memory region's reference count + * + * Whenever memory regions are accessed outside the BQL, they need to be + * preserved against hot-unplug. MemoryRegions actually do not have their + * own reference count; they piggyback on a QOM object, their "owner". + * This function removes a reference to the owner and possibly destroys it. + * + * @mr: the #MemoryRegion + */ +void memory_region_unref(MemoryRegion *mr); + /** * memory_region_init_io: Initialize an I/O memory region. * diff --git a/memory.c b/memory.c index 61b3f25..b74078c 100644 --- a/memory.c +++ b/memory.c @@ -1105,6 +1105,20 @@ Object *memory_region_owner(MemoryRegion *mr) return mr->owner; } +void memory_region_ref(MemoryRegion *mr) +{ + if (mr && mr->owner) { + object_ref(mr->owner); + } +} + +void memory_region_unref(MemoryRegion *mr) +{ + if (mr && mr->owner) { + object_unref(mr->owner); + } +} + uint64_t memory_region_size(MemoryRegion *mr) { if (int128_eq(mr->size, int128_2_64())) { -- 1.8.1.4