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Wysocki" CC: Jayachandran C , Lorenzo Pieralisi , Tomasz Nowicki Subject: [PATCH v4 2/5] PCI: Handle ACPI companion and domain number Date: Thu, 24 Dec 2015 17:27:29 +0530 Message-ID: <1450958252-29892-3-git-send-email-jchandra@broadcom.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1450958252-29892-1-git-send-email-jchandra@broadcom.com> References: <1450958252-29892-1-git-send-email-jchandra@broadcom.com> MIME-Version: 1.0 Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org pci_create_root_bus is called with NULL as parent in ACPI. This ends up calling pci_bus_assign_domain_nr with a NULL parent, which crashes when dereferencing parent. Fix this by providing away to set the ACPI domain number, we define acpi_pci_sysdata_to_root_info() to get the acpi root info from sysdata. This is a simple cast the generic ACPI PCI implementation. Similarly, setting up the ACPI companion in case of generic ACPI PCI implementation is staright forward. Signed-off-by: Jayachandran C --- drivers/pci/pci.c | 19 ++++++++++++++++++- drivers/pci/probe.c | 2 ++ include/linux/pci-acpi.h | 28 +++++++++++++++++++++++++++- 3 files changed, 47 insertions(+), 2 deletions(-) -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 314db8c..f578af4 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -20,6 +20,7 @@ #include #include #include +#include #include #include #include @@ -4772,9 +4773,25 @@ int pci_get_new_domain_nr(void) void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent) { static int use_dt_domains = -1; - int domain = of_get_pci_domain_nr(parent->of_node); + int domain; /* + * Handle ACPI early + * + * the companion is not set at this point, and ACPI sets parent to + * NULL, we have to try to get the segment from acpi root info. + */ + if (!parent || !parent->of_node) { + struct acpi_pci_root_info *ci; + + ci = acpi_pci_sysdata_to_root_info(bus->sysdata); + if (ci) + bus->domain_nr = ci->root->segment; + return; + } + + domain = of_get_pci_domain_nr(parent->of_node); + /* * Check DT domain and use_dt_domains values. * * If DT domain property is valid (domain >= 0) and diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index edb1984..5af66496 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -13,6 +13,7 @@ #include #include #include +#include #include #include #include @@ -2105,6 +2106,7 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus, bridge->dev.parent = parent; bridge->dev.release = pci_release_host_bridge_dev; dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus); + pci_acpi_set_companion(bridge); error = pcibios_root_bridge_prepare(bridge); if (error) { kfree(bridge); diff --git a/include/linux/pci-acpi.h b/include/linux/pci-acpi.h index e9450ef..79448ce 100644 --- a/include/linux/pci-acpi.h +++ b/include/linux/pci-acpi.h @@ -138,12 +138,38 @@ extern struct list_head pci_mmcfg_list; #define PCI_MMCFG_BUS_OFFSET(bus) ((bus) << 20) #define PCI_MMCFG_OFFSET(bus, devfn) ((bus) << 20 | (devfn) << 12) - #else /* CONFIG_ACPI */ static inline void acpi_pci_add_bus(struct pci_bus *bus) { } static inline void acpi_pci_remove_bus(struct pci_bus *bus) { } #endif /* CONFIG_ACPI */ +#if defined(CONFIG_ACPI) && defined(CONFIG_ACPI_PCI_HOST_GENERIC) +static inline struct acpi_pci_root_info *acpi_pci_sysdata_to_root_info(void *sd) +{ + return (struct acpi_pci_root_info *)sd; +} + +static inline void pci_acpi_set_companion(struct pci_host_bridge *bridge) +{ + struct pci_bus *b = bridge->bus; + struct acpi_pci_root_info *ci; + + ci = acpi_pci_sysdata_to_root_info(b->sysdata); + if (ci) + ACPI_COMPANION_SET(&bridge->dev, ci->bridge); +} +#else +static inline struct acpi_pci_root_info *acpi_pci_sysdata_to_root_info(void *sd) +{ + return NULL; +} + +static inline void pci_acpi_set_companion(struct pci_host_bridge *bridge) +{ + /* leave it to the platform for now */ +} +#endif + #ifdef CONFIG_ACPI_APEI extern bool aer_acpi_firmware_first(void); #else