From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:34605) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Ujq80-0007Ub-5N for qemu-devel@nongnu.org; Tue, 04 Jun 2013 08:14:18 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Ujq7v-0002NO-FI for qemu-devel@nongnu.org; Tue, 04 Jun 2013 08:14:16 -0400 Received: from mail-bk0-x232.google.com ([2a00:1450:4008:c01::232]:59943) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Ujq7v-0002NG-8m for qemu-devel@nongnu.org; Tue, 04 Jun 2013 08:14:11 -0400 Received: by mail-bk0-f50.google.com with SMTP id ik5so89191bkc.37 for ; Tue, 04 Jun 2013 05:14:10 -0700 (PDT) Sender: Paolo Bonzini From: Paolo Bonzini Date: Tue, 4 Jun 2013 14:13:46 +0200 Message-Id: <1370348041-6768-3-git-send-email-pbonzini@redhat.com> In-Reply-To: <1370348041-6768-1-git-send-email-pbonzini@redhat.com> References: <1370348041-6768-1-git-send-email-pbonzini@redhat.com> Subject: [Qemu-devel] [PATCH v2 02/17] 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 e51f30f..bfcdf65 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -268,6 +268,36 @@ struct MemoryListener { void memory_region_init(MemoryRegion *mr, 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 b40cdde..a136a77 100644 --- a/memory.c +++ b/memory.c @@ -1134,6 +1134,20 @@ void memory_region_set_owner(MemoryRegion *mr, } } +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