From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Return-Path: Subject: Re: [PATCH V7 1/8] ACPI: I/O Remapping Table (IORT) initial support To: Tomasz Nowicki , marc.zyngier@arm.com, tglx@linutronix.de, jason@lakedaemon.net, rjw@rjwysocki.net, bhelgaas@google.com, lorenzo.pieralisi@arm.com, robert.richter@caviumnetworks.com, shijie.huang@arm.com, Suravee.Suthikulpanit@amd.com References: <1466420541-20101-1-git-send-email-tn@semihalf.com> <1466420541-20101-2-git-send-email-tn@semihalf.com> From: Hanjun Guo Message-ID: <372d3b78-2bc5-94d1-49f6-c9229affa65d@linaro.org> Date: Tue, 21 Jun 2016 15:12:57 +0800 MIME-Version: 1.0 In-Reply-To: <1466420541-20101-2-git-send-email-tn@semihalf.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: al.stone@linaro.org, graeme.gregory@linaro.org, Catalin.Marinas@arm.com, will.deacon@arm.com, linux-kernel@vger.kernel.org, okaya@codeaurora.org, linux-acpi@vger.kernel.org, ddaney.cavm@gmail.com, linux-pci@vger.kernel.org, mw@semihalf.com, andrea.gallo@linaro.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+bjorn=helgaas.com@lists.infradead.org List-ID: Hi Tomasz, Sorry for jumping out late, just one comment below. On 2016/6/20 19:02, Tomasz Nowicki wrote: > IORT shows representation of IO topology for ARM based systems. > It describes how various components are connected together on > parent-child basis e.g. PCI RC -> SMMU -> ITS. Also see IORT spec. > > Initial support allows to detect IORT table presence and save its > root pointer obtained through acpi_get_table(). The pointer validity > depends on acpi_gbl_permanent_mmap because if acpi_gbl_permanent_mmap > is not set while using IORT nodes we would dereference unmapped pointers. > > For the aforementioned reason call iort_table_detect() from acpi_init() > which guarantees acpi_gbl_permanent_mmap to be set at that point. > > Add generic helpers which are helpful for scanning and retrieving > information from IORT table content. List of the most important helpers: > - iort_find_dev_node() finds IORT node for a given device > - iort_node_map_rid() maps device RID and returns IORT node which provides > final translation > > Signed-off-by: Tomasz Nowicki > --- > drivers/acpi/Kconfig | 3 + > drivers/acpi/Makefile | 1 + > drivers/acpi/bus.c | 2 + > drivers/acpi/iort.c | 220 ++++++++++++++++++++++++++++++++++++++++++++++++++ > include/linux/iort.h | 30 +++++++ [...] > +static acpi_status > +iort_match_node_callback(struct acpi_iort_node *node, void *context) > +{ > + struct device *dev = context; > + > + switch (node->type) { > + case ACPI_IORT_NODE_NAMED_COMPONENT: { > + struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; ACPI_ALLOCATE_BUFFER is used here, so ... > + struct acpi_device *adev = to_acpi_device_node(dev->fwnode); > + struct acpi_iort_named_component *ncomp; > + > + if (!adev) > + break; > + > + ncomp = (struct acpi_iort_named_component *)node->node_data; > + > + if (ACPI_FAILURE(acpi_get_name(adev->handle, > + ACPI_FULL_PATHNAME, &buffer))) { > + dev_warn(dev, "Can't get device full path name\n"); > + break; > + } > + > + if (!strcmp(ncomp->device_name, (char *)buffer.pointer)) > + return AE_OK; ... we need to kfree(buffer.pointer) before we return or break. With this fixed, Reviewed-by: Hanjun Guo Thanks Hanjun > + > + break; > + } _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel