On Fri, Apr 15, 2016 at 07:06:37PM +0200, Tomasz Nowicki wrote:
As we now have valid PCI host bridge device reference we can introduce code that is going to find its bus domain number using ACPI _SEG method.
Note that _SEG method is optional, therefore _SEG absence means that all PCI buses belong to domain 0.
While at it, for the sake of code clarity we put ACPI and DT domain assign methods into the corresponding helpers.
Signed-off-by: Tomasz Nowicki tn@semihalf.com Reviewed-by: Liviu Dudau Liviu.Dudau@arm.com Tested-by: Suravee Suthikulpanit Suravee.Suthikulpanit@amd.com Tested-by: Jeremy Linton jeremy.linton@arm.com Tested-by: Duc Dang dhdang@apm.com Tested-by: Dongdong Liu liudongdong3@huawei.com Tested-by: Hanjun Guo hanjun.guo@linaro.org Tested-by: Graeme Gregory graeme.gregory@linaro.org Tested-by: Sinan Kaya okaya@codeaurora.org
drivers/acpi/pci_root.c | 18 ++++++++++++++++++ drivers/pci/pci.c | 11 +++++++++-- include/linux/pci-acpi.h | 2 ++ 3 files changed, 29 insertions(+), 2 deletions(-)
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c index 4581e0e..d9a70c4 100644 --- a/drivers/acpi/pci_root.c +++ b/drivers/acpi/pci_root.c @@ -419,6 +419,24 @@ out: } EXPORT_SYMBOL(acpi_pci_osc_control_set); +int acpi_pci_bus_domain_nr(struct device *parent) +{
- struct acpi_device *acpi_dev = to_acpi_device(parent);
- unsigned long long segment = 0;
- acpi_status status;
- /*
* If _SEG method does not exist, following ACPI spec (6.5.6)* all PCI buses belong to domain 0.*/- status = acpi_evaluate_integer(acpi_dev->handle, METHOD_NAME__SEG, NULL,
&segment);
We already have code in acpi_pci_root_add() to evaluate _SEG. We don't want to evaluate it *twice*, do we?
I was sort of expecting that if you added it here, we'd remove the existing call, but it looks like you're keeping both?
- if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
dev_err(&acpi_dev->dev, "can't evaluate _SEG\n");- return segment;
+}
static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm) { u32 support, control, requested; diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 25e0327..1a74e87 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -19,6 +19,7 @@ #include <linux/spinlock.h> #include <linux/string.h> #include <linux/log2.h> +#include <linux/pci-acpi.h> #include <linux/pci-aspm.h> #include <linux/pm_wakeup.h> #include <linux/interrupt.h> @@ -4779,7 +4780,7 @@ int pci_get_new_domain_nr(void) } #ifdef CONFIG_PCI_DOMAINS_GENERIC -void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent) +static int of_pci_bus_domain_nr(struct device *parent) { static int use_dt_domains = -1; int domain = -1; @@ -4823,7 +4824,13 @@ void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent) domain = -1; }
- bus->domain_nr = domain;
- return domain;
+}
+void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent) +{
- bus->domain_nr = acpi_disabled ? of_pci_bus_domain_nr(parent) :
acpi_pci_bus_domain_nr(parent);} #endif #endif diff --git a/include/linux/pci-acpi.h b/include/linux/pci-acpi.h index 89ab057..a72e22d 100644 --- a/include/linux/pci-acpi.h +++ b/include/linux/pci-acpi.h @@ -22,6 +22,7 @@ static inline acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev) { return acpi_remove_pm_notifier(dev); } +extern int acpi_pci_bus_domain_nr(struct device *parent); extern phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle); static inline acpi_handle acpi_find_root_bridge_handle(struct pci_dev *pdev) @@ -109,6 +110,7 @@ extern const u8 pci_acpi_dsm_uuid[]; #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) { } +static inline int acpi_pci_bus_domain_nr(struct device *parent) { return -1; } #endif /* CONFIG_ACPI */
#ifdef CONFIG_ACPI_APEI
1.9.1
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