From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754213AbbJOGQI (ORCPT ); Thu, 15 Oct 2015 02:16:08 -0400 Received: from mail-lf0-f45.google.com ([209.85.215.45]:33339 "EHLO mail-lf0-f45.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753535AbbJOGQE (ORCPT ); Thu, 15 Oct 2015 02:16:04 -0400 Subject: Re: [PATCH V2 6/6] gicv2m: acpi: Introducing GICv2m ACPI support To: Suravee Suthikulpanit , marc.zyngier@arm.com, tglx@linutronix.de, jason@lakedaemon.net, rjw@rjwysocki.net References: <1444865156-9870-1-git-send-email-Suravee.Suthikulpanit@amd.com> <1444865156-9870-7-git-send-email-Suravee.Suthikulpanit@amd.com> Cc: Lorenzo Pieralisi , Will Deacon , Catalin Marinas , hanjun.guo@linaro.org, graeme.gregory@linaro.org, dhdang@apm.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org From: Tomasz Nowicki Message-ID: <561F449E.2050803@semihalf.com> Date: Thu, 15 Oct 2015 08:15:58 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Firefox/38.0 Thunderbird/38.3.0 MIME-Version: 1.0 In-Reply-To: <1444865156-9870-7-git-send-email-Suravee.Suthikulpanit@amd.com> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Suravee, On 15.10.2015 01:25, Suravee Suthikulpanit wrote: > This patch introduces gicv2m_acpi_init(), which uses information > in MADT GIC MSI frames structure to initialize GICv2m driver. > > Signed-off-by: Suravee Suthikulpanit > Signed-off-by: Hanjun Guo > --- > drivers/irqchip/irq-gic-v2m.c | 94 +++++++++++++++++++++++++++++++++++++++++ > drivers/irqchip/irq-gic.c | 3 ++ > include/linux/irqchip/arm-gic.h | 6 +++ > 3 files changed, 103 insertions(+) > > diff --git a/drivers/irqchip/irq-gic-v2m.c b/drivers/irqchip/irq-gic-v2m.c > index 7e60f7e..290f5b3 100644 > --- a/drivers/irqchip/irq-gic-v2m.c > +++ b/drivers/irqchip/irq-gic-v2m.c > @@ -15,9 +15,11 @@ > > #define pr_fmt(fmt) "GICv2m: " fmt > > +#include > #include > #include > #include > +#include > #include > #include > #include > @@ -138,6 +140,11 @@ static int gicv2m_irq_gic_domain_alloc(struct irq_domain *domain, > fwspec.param[0] = 0; > fwspec.param[1] = hwirq - 32; > fwspec.param[2] = IRQ_TYPE_EDGE_RISING; > + } else if (is_fwnode_irqchip(domain->parent->fwnode)) { > + fwspec.fwnode = domain->parent->fwnode; > + fwspec.param_count = 2; > + fwspec.param[0] = hwirq; > + fwspec.param[1] = IRQ_TYPE_EDGE_RISING & IRQ_TYPE_SENSE_MASK; How about just: fwspec.param[1] = IRQ_TYPE_EDGE_RISING; > } else { > return -EINVAL; > } > @@ -255,6 +262,8 @@ static void gicv2m_teardown(void) > kfree(v2m->bm); > iounmap(v2m->base); > of_node_put(to_of_node(v2m->fwnode)); > + if (is_fwnode_irqchip(v2m->fwnode)) > + irq_domain_free_fwnode(v2m->fwnode); > kfree(v2m); > } > } > @@ -359,6 +368,8 @@ static int __init gicv2m_init_one(struct fwnode_handle *fwnode, > > if (to_of_node(fwnode)) > name = to_of_node(fwnode)->name; > + else > + name = irq_domain_get_irqchip_fwnode_name(fwnode); > > pr_info("Frame %s: range[%#lx:%#lx], SPI[%d:%d]\n", name, > (unsigned long)res->start, (unsigned long)res->end, > @@ -415,3 +426,86 @@ int __init gicv2m_of_init(struct device_node *node, struct irq_domain *parent) > gicv2m_teardown(); > return ret; > } > + > +#ifdef CONFIG_ACPI > +static int acpi_num_msi; > + > +static struct fwnode_handle *gicv2m_get_fwnode(struct device *dev) > +{ > + struct v2m_data *data; > + > + if (WARN_ON(acpi_num_msi <= 0)) > + return NULL; > + > + /* We only return the fwnode of the first MSI frame. */ > + data = list_first_entry_or_null(&v2m_nodes, > + struct v2m_data, entry); This can be one line and still fits within 80 characters. > + if (!data) > + return NULL; > + > + return data->fwnode; > +} > + > +static int __init > +acpi_parse_madt_msi(struct acpi_subtable_header *header, > + const unsigned long end) > +{ > + int ret; > + struct resource res; > + u32 spi_start = 0, nr_spis = 0; > + struct acpi_madt_generic_msi_frame *m; > + struct fwnode_handle *fwnode = NULL; > + > + m = (struct acpi_madt_generic_msi_frame *)header; > + if (BAD_MADT_ENTRY(m, end)) > + return -EINVAL; > + > + res.start = m->base_address; > + res.end = m->base_address + 0x1000; > + > + if (m->flags & ACPI_MADT_OVERRIDE_SPI_VALUES) { > + spi_start = m->spi_base; > + nr_spis = m->spi_count; > + > + pr_info("ACPI overriding V2M MSI_TYPER (base:%u, num:%u)\n", > + spi_start, nr_spis); > + } > + > + fwnode = irq_domain_alloc_fwnode((void *)m->base_address); > + if (!fwnode) { > + pr_err("Unable to allocate GICv2m domain token\n"); > + return -EINVAL; > + } > + > + ret = gicv2m_init_one(fwnode, spi_start, nr_spis, &res); I case of error, we should call here: irq_domain_free_fwnode(fwnode); > + > + return ret; > +} > + > +int __init gicv2m_acpi_init(struct irq_domain *parent) > +{ > + int ret; > + > + if (acpi_num_msi > 0) > + return 0; > + > + acpi_num_msi = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_MSI_FRAME, > + acpi_parse_madt_msi, 0); > + > + if (acpi_num_msi <= 0) > + goto err_out; If acpi_table_parse_madt return 0, then we don't need to call gicv2m_teardown(). Instead we can simply return, optionally add some pr_info. Well, gicv2m_teardown would do nothing, so this is just cosmetic and up to you. > + > + ret = gicv2m_allocate_domains(parent); > + if (ret) > + goto err_out; > + > + pci_msi_register_fwnode_provider(&gicv2m_get_fwnode); > + > + return 0; > + > +err_out: > + gicv2m_teardown(); > + return -EINVAL; > +} > + > +#endif /* CONFIG_ACPI */ > diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c > index 6685b33..bb3e1f2 100644 > --- a/drivers/irqchip/irq-gic.c > +++ b/drivers/irqchip/irq-gic.c > @@ -1329,6 +1329,9 @@ gic_v2_acpi_init(struct acpi_table_header *table) > > __gic_init_bases(0, -1, dist_base, cpu_base, 0, domain_handle); > > + if (IS_ENABLED(CONFIG_ARM_GIC_V2M)) > + gicv2m_acpi_init(gic_data[0].domain); > + > acpi_set_irq_model(ACPI_IRQ_MODEL_GIC, domain_handle); > return 0; > } > diff --git a/include/linux/irqchip/arm-gic.h b/include/linux/irqchip/arm-gic.h > index bae69e5..7398538 100644 > --- a/include/linux/irqchip/arm-gic.h > +++ b/include/linux/irqchip/arm-gic.h > @@ -108,6 +108,12 @@ void gic_init(unsigned int nr, int start, > > int gicv2m_of_init(struct device_node *node, struct irq_domain *parent); > > +#ifdef CONFIG_ACPI > +#include I think, we don't need this include here. You already added it to itq-gic.c Moreover, seems we need to add irq_domain_free_fwnode to gicv2m_teardown(): static void gicv2m_teardown(void) { struct v2m_data *v2m, *tmp; list_for_each_entry_safe(v2m, tmp, &v2m_nodes, entry) { + struct fwnode_handle *handle = v2m->fwnode; + list_del(&v2m->entry); kfree(v2m->bm); iounmap(v2m->base); - of_node_put(to_of_node(v2m->fwnode)); + if (is_of_node(handle)) + of_node_put(to_of_node(handle)); + else if (is_irqchip_node(handle)) + irq_domain_free_fwnode(handle); kfree(v2m); } } Thanks, Tomasz