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authorLorenzo Pieralisi <lorenzo.pieralisi@arm.com>2014-12-27 18:19:12 -0700
committerBjorn Helgaas <bhelgaas@google.com>2014-12-27 18:19:12 -0700
commit7c674700098c87b305b99652e3c694c4ef195866 (patch)
tree25a428aaf73fa599d43b42980e1085c5c3aca181 /drivers/pci
parent97bf6af1f928216fd6c5a66e8a57bfa95a659672 (diff)
downloadop-kernel-dev-7c674700098c87b305b99652e3c694c4ef195866.zip
op-kernel-dev-7c674700098c87b305b99652e3c694c4ef195866.tar.gz
PCI: Move domain assignment from arm64 to generic code
The current logic in arm64 pci_bus_assign_domain_nr() is flawed in that depending on the host controller configuration for a platform and the initialization sequence, core code may end up allocating PCI domain numbers from both DT and the generic domain counter, which would result in PCI domain allocation aliases/errors. Fix the logic behind the PCI domain number assignment and move the resulting code to the PCI core so the same domain allocation logic is used on all platforms that select CONFIG_PCI_DOMAINS_GENERIC. [bhelgaas: tidy changelog] Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Liviu Dudau <Liviu.Dudau@arm.com> Acked-by: Arnd Bergmann <arnd@arndb.de> CC: Rob Herring <robh+dt@kernel.org> CC: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/pci.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index cab05f3..c419554 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -10,6 +10,8 @@
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/init.h>
+#include <linux/of.h>
+#include <linux/of_pci.h>
#include <linux/pci.h>
#include <linux/pm.h>
#include <linux/slab.h>
@@ -4439,6 +4441,53 @@ int pci_get_new_domain_nr(void)
{
return atomic_inc_return(&__domain_nr);
}
+
+#ifdef CONFIG_PCI_DOMAINS_GENERIC
+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);
+
+ /*
+ * Check DT domain and use_dt_domains values.
+ *
+ * If DT domain property is valid (domain >= 0) and
+ * use_dt_domains != 0, the DT assignment is valid since this means
+ * we have not previously allocated a domain number by using
+ * pci_get_new_domain_nr(); we should also update use_dt_domains to
+ * 1, to indicate that we have just assigned a domain number from
+ * DT.
+ *
+ * If DT domain property value is not valid (ie domain < 0), and we
+ * have not previously assigned a domain number from DT
+ * (use_dt_domains != 1) we should assign a domain number by
+ * using the:
+ *
+ * pci_get_new_domain_nr()
+ *
+ * API and update the use_dt_domains value to keep track of method we
+ * are using to assign domain numbers (use_dt_domains = 0).
+ *
+ * All other combinations imply we have a platform that is trying
+ * to mix domain numbers obtained from DT and pci_get_new_domain_nr(),
+ * which is a recipe for domain mishandling and it is prevented by
+ * invalidating the domain value (domain = -1) and printing a
+ * corresponding error.
+ */
+ if (domain >= 0 && use_dt_domains) {
+ use_dt_domains = 1;
+ } else if (domain < 0 && use_dt_domains != 1) {
+ use_dt_domains = 0;
+ domain = pci_get_new_domain_nr();
+ } else {
+ dev_err(parent, "Node %s has inconsistent \"linux,pci-domain\" property in DT\n",
+ parent->of_node->full_name);
+ domain = -1;
+ }
+
+ bus->domain_nr = domain;
+}
+#endif
#endif
/**
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