From mboxrd@z Thu Jan 1 00:00:00 1970 From: Xiao Guangrong Subject: Re: [PATCH v3 26/32] nvdimm: save arg3 for NVDIMM device _DSM method Date: Mon, 19 Oct 2015 15:14:28 +0800 Message-ID: <56249854.2090007@linux.intel.com> References: <1444535584-18220-1-git-send-email-guangrong.xiao@linux.intel.com> <1444535584-18220-27-git-send-email-guangrong.xiao@linux.intel.com> <20151019095026-mutt-send-email-mst@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Cc: pbonzini@redhat.com, imammedo@redhat.com, gleb@kernel.org, mtosatti@redhat.com, stefanha@redhat.com, rth@twiddle.net, ehabkost@redhat.com, dan.j.williams@intel.com, kvm@vger.kernel.org, qemu-devel@nongnu.org To: "Michael S. Tsirkin" Return-path: Received: from mga01.intel.com ([192.55.52.88]:51422 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752706AbbJSHXd (ORCPT ); Mon, 19 Oct 2015 03:23:33 -0400 In-Reply-To: <20151019095026-mutt-send-email-mst@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: On 10/19/2015 02:50 PM, Michael S. Tsirkin wrote: > On Sun, Oct 11, 2015 at 11:52:58AM +0800, Xiao Guangrong wrote: >> Check if the input Arg3 is valid then store it into dsm_in if needed >> >> We only do the save on NVDIMM device since we are not going to support any >> function on root device >> >> Signed-off-by: Xiao Guangrong >> --- >> hw/mem/nvdimm/acpi.c | 21 ++++++++++++++++++++- >> 1 file changed, 20 insertions(+), 1 deletion(-) >> >> diff --git a/hw/mem/nvdimm/acpi.c b/hw/mem/nvdimm/acpi.c >> index d9fa0fd..3b9399c 100644 >> --- a/hw/mem/nvdimm/acpi.c >> +++ b/hw/mem/nvdimm/acpi.c >> @@ -442,7 +442,7 @@ static void build_nvdimm_devices(NVDIMMState *state, GSList *device_list, >> int slot = object_property_get_int(OBJECT(nvdimm), DIMM_SLOT_PROP, >> NULL); >> uint32_t handle = nvdimm_slot_to_handle(slot); >> - Aml *dev, *method; >> + Aml *dev, *method, *ifctx; >> >> dev = aml_device("NV%02X", slot); >> aml_append(dev, aml_name_decl("_ADR", aml_int(handle))); >> @@ -452,6 +452,24 @@ static void build_nvdimm_devices(NVDIMMState *state, GSList *device_list, >> method = aml_method("_DSM", 4); >> { >> SAVE_ARG012_HANDLE_LOCK(method, aml_int(handle)); >> + >> + /* Arg3 is passed as Package and it has one element? */ >> + ifctx = aml_if(aml_and(aml_equal(aml_object_type(aml_arg(3)), >> + aml_int(4)), >> + aml_equal(aml_sizeof(aml_arg(3)), > > aml_arg(3) is used many times below. > Pls give it a name that makes sense (not arg3! what is it for?) > Er. aml_arg(3) is just the fourth parameter of _DSM method. Will add some comments: /* * The fourth parameter (Arg3) of _DMS is a package which contains a buffer, the * layout of the buffer is specified by UUID (Arg0), Revision ID (Arg1) and * Function Index (Arg2) which are documented in the DSM specification. */ >> + aml_int(1)))); > > Pls document AML constants used. > Like this: > > ifctx = aml_if(aml_and(aml_equal(aml_object_type(aml_arg(3)), > aml_int(4 /* 4 - Package */) ), > aml_equal(aml_sizeof(aml_arg(3)), > aml_int(1)))); > >> + { >> + /* Local0 = Index(Arg3, 0) */ >> + aml_append(ifctx, aml_store(aml_index(aml_arg(3), aml_int(0)), >> + aml_local(0))); >> + /* Local3 = DeRefOf(Local0) */ >> + aml_append(ifctx, aml_store(aml_derefof(aml_local(0)), >> + aml_local(3))); >> + /* ARG3 = Local3 */ >> + aml_append(ifctx, aml_store(aml_local(3), aml_name("ARG3"))); > > This isn't a good way to comment things: you are > just adding ASL before the equivalent C. > Pls document what's going on. > Okay... i just thought C is little readable than AML. Will change the comment to: /* fetch buffer from the package (Arg3) and store it to DSM memory. */ Thanks.