From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:41629) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fUv6d-00025y-9e for qemu-devel@nongnu.org; Mon, 18 Jun 2018 10:26:13 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fUv6c-0000rR-A5 for qemu-devel@nongnu.org; Mon, 18 Jun 2018 10:26:07 -0400 From: David Hildenbrand Date: Mon, 18 Jun 2018 16:25:35 +0200 Message-Id: <20180618142536.23995-12-david@redhat.com> In-Reply-To: <20180618142536.23995-1-david@redhat.com> References: <20180618142536.23995-1-david@redhat.com> Subject: [Qemu-devel] [PATCH v4 11/12] nvdimm: make get_memory_region() perform checks and initialization List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: qemu-ppc@nongnu.org, Eduardo Habkost , Igor Mammedov , "Michael S . Tsirkin" , Marcel Apfelbaum , Paolo Bonzini , Richard Henderson , Xiao Guangrong , David Gibson , Alexander Graf , David Hildenbrand We might get a call to get_memory_region() before the device has been realized. We should return a consistent value, as the return value will e.g. later on be used in the pre_plug handler. To avoid duplicating too much code, factor the initialization and checks out into a helper function. Reviewed-by: Igor Mammedov Signed-off-by: David Hildenbrand --- hw/mem/nvdimm.c | 46 +++++++++++++++++++++++++++++++++++++--------- 1 file changed, 37 insertions(+), 9 deletions(-) diff --git a/hw/mem/nvdimm.c b/hw/mem/nvdimm.c index db7d8c3050..bba98e57e1 100644 --- a/hw/mem/nvdimm.c +++ b/hw/mem/nvdimm.c @@ -71,20 +71,24 @@ static void nvdimm_init(Object *obj) NULL, NULL); } -static MemoryRegion *nvdimm_get_memory_region(PCDIMMDevice *dimm, Error **errp) +static void nvdimm_prepare_memory_region(NVDIMMDevice *nvdimm, Error **errp) { - NVDIMMDevice *nvdimm = NVDIMM(dimm); + PCDIMMDevice *dimm = PC_DIMM(nvdimm); + uint64_t align, pmem_size, size; + MemoryRegion *mr; - return nvdimm->nvdimm_mr; -} + if (nvdimm->nvdimm_mr) { + return; + } -static void nvdimm_realize(PCDIMMDevice *dimm, Error **errp) -{ - MemoryRegion *mr = host_memory_backend_get_memory(dimm->hostmem); - NVDIMMDevice *nvdimm = NVDIMM(dimm); - uint64_t align, pmem_size, size = memory_region_size(mr); + if (!dimm->hostmem) { + error_setg(errp, "'" PC_DIMM_MEMDEV_PROP "' property must be set"); + return; + } + mr = host_memory_backend_get_memory(dimm->hostmem); align = memory_region_get_alignment(mr); + size = memory_region_size(mr); pmem_size = size - nvdimm->label_size; nvdimm->label_data = memory_region_get_ram_ptr(mr) + pmem_size; @@ -108,6 +112,30 @@ static void nvdimm_realize(PCDIMMDevice *dimm, Error **errp) nvdimm->nvdimm_mr->align = align; } +static MemoryRegion *nvdimm_get_memory_region(PCDIMMDevice *dimm, Error **errp) +{ + NVDIMMDevice *nvdimm = NVDIMM(dimm); + Error *local_err = NULL; + + if (!nvdimm->nvdimm_mr) { + nvdimm_prepare_memory_region(nvdimm, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return NULL; + } + } + return nvdimm->nvdimm_mr; +} + +static void nvdimm_realize(PCDIMMDevice *dimm, Error **errp) +{ + NVDIMMDevice *nvdimm = NVDIMM(dimm); + + if (!nvdimm->nvdimm_mr) { + nvdimm_prepare_memory_region(nvdimm, errp); + } +} + /* * the caller should check the input parameters before calling * label read/write functions. -- 2.17.1