On 05/01/2015 04:03 PM, Gavin Shan wrote:
The pci_dn instances are allocated from memblock or bootmem when
creating PCI controller (hoses) in setup_arch(). The PCI hotplug,
which will be supported by proceeding patches, will release PCI
device nodes and their corresponding pci_dn on unplugging event.
The pci_dn instance memory chunks alloed from memblock or bootmem
are hard to reused after being released.
The patch delay creating pci_dn so that they can be allocated from
slab. In turn, the memory chunks for them can be reused after being
released without problem. The creation of eeh_dev instances, which
depends on pci_dn, is delayed a bit as well.
Signed-off-by: Gavin Shan <gwshan@xxxxxxxxxxxxxxxxxx>
---
arch/powerpc/include/asm/ppc-pci.h | 1 -
arch/powerpc/kernel/eeh_dev.c | 2 +-
arch/powerpc/kernel/pci_dn.c | 40 +++++++++++++++++++---------------
arch/powerpc/platforms/maple/pci.c | 35 +++++++++++++++++------------
arch/powerpc/platforms/pasemi/pci.c | 3 ---
arch/powerpc/platforms/powermac/pci.c | 39 ++++++++++++++++++++-------------
arch/powerpc/platforms/powernv/pci.c | 3 ---
arch/powerpc/platforms/pseries/setup.c | 1 -
8 files changed, 68 insertions(+), 56 deletions(-)
diff --git a/arch/powerpc/include/asm/ppc-pci.h b/arch/powerpc/include/asm/ppc-pci.h
index 4122a86..7388316 100644
--- a/arch/powerpc/include/asm/ppc-pci.h
+++ b/arch/powerpc/include/asm/ppc-pci.h
@@ -40,7 +40,6 @@ void *traverse_pci_dn(struct pci_dn *root,
void *(*fn)(struct pci_dn *, void *),
void *data);
-extern void pci_devs_phb_init(void);
extern void pci_devs_phb_init_dynamic(struct pci_controller *phb);
/* From rtas_pci.h */
diff --git a/arch/powerpc/kernel/eeh_dev.c b/arch/powerpc/kernel/eeh_dev.c
index aabba94..f33ce5b 100644
--- a/arch/powerpc/kernel/eeh_dev.c
+++ b/arch/powerpc/kernel/eeh_dev.c
@@ -110,4 +110,4 @@ static int __init eeh_dev_phb_init(void)
return 0;
}
-core_initcall(eeh_dev_phb_init);
+core_initcall_sync(eeh_dev_phb_init);
diff --git a/arch/powerpc/kernel/pci_dn.c b/arch/powerpc/kernel/pci_dn.c
index b3b4df9..d3833af 100644
--- a/arch/powerpc/kernel/pci_dn.c
+++ b/arch/powerpc/kernel/pci_dn.c
@@ -277,7 +277,7 @@ void *update_dn_pci_info(struct device_node *dn, void *data)
struct device_node *parent;
struct pci_dn *pdn;
- pdn = zalloc_maybe_bootmem(sizeof(*pdn), GFP_KERNEL);
+ pdn = kzalloc(sizeof(*pdn), GFP_KERNEL);
if (pdn == NULL)
return NULL;
dn->data = pdn;
@@ -442,33 +442,37 @@ void pci_devs_phb_init_dynamic(struct pci_controller *phb)
traverse_pci_devices(dn, update_dn_pci_info, phb);
}
-/**
+static void pci_dev_pdn_setup(struct pci_dev *pdev)
+{
+ struct pci_dn *pdn;
+
+ if (pdev->dev.archdata.pci_data)
+ return;
+
+ /* Setup the fast path */
+ pdn = pci_get_pdn(pdev);
+ pdev->dev.archdata.pci_data = pdn;
+}
+DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, pci_dev_pdn_setup);
How does moving of the chunk above help to "Delay creating pci_dn"?
+
+/*
* pci_devs_phb_init - Initialize phbs and pci devs under them.
- *
- * This routine walks over all phb's (pci-host bridges) on the
- * system, and sets up assorted pci-related structures
+ *
+ * This routine walks over all phb's (pci-host bridges) on
+ * the system, and sets up assorted pci-related structures
* (including pci info in the device node structs) for each
* pci device found underneath. This routine runs once,
* early in the boot sequence.
*/
-void __init pci_devs_phb_init(void)
+static int __init pci_devs_phb_init(void)
{
struct pci_controller *phb, *tmp;
/* This must be done first so the device nodes have valid pci info! */
list_for_each_entry_safe(phb, tmp, &hose_list, list_node)
pci_devs_phb_init_dynamic(phb);
-}
-
-static void pci_dev_pdn_setup(struct pci_dev *pdev)
-{
- struct pci_dn *pdn;
- if (pdev->dev.archdata.pci_data)
- return;
-
- /* Setup the fast path */
- pdn = pci_get_pdn(pdev);
- pdev->dev.archdata.pci_data = pdn;
+ return 0;
}
-DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, pci_dev_pdn_setup);
+
+core_initcall(pci_devs_phb_init);
diff --git a/arch/powerpc/platforms/maple/pci.c b/arch/powerpc/platforms/maple/pci.c
index a923230..04a69a8 100644
--- a/arch/powerpc/platforms/maple/pci.c
+++ b/arch/powerpc/platforms/maple/pci.c
@@ -568,6 +568,26 @@ void maple_pci_irq_fixup(struct pci_dev *dev)
DBG(" <- maple_pci_irq_fixup\n");
}
+static int maple_pci_root_bridge_prepare(struct pci_host_bridge *bridge)
+{
+ struct pci_controller *hose = pci_bus_to_host(bridge->bus);
+ struct device_node *np, *child;
+
+ if (hose != u3_agp)
+ return 0;
+
+ /* Fixup the PCI<->OF mapping for U3 AGP due to bus renumbering. We
+ * assume there is no P2P bridge on the AGP bus, which should be a
+ * safe assumptions hopefully.
+ */
+ np = hose->dn;
+ PCI_DN(np)->busno = 0xf0;
+ for_each_child_of_node(np, child)
+ PCI_DN(child)->busno = 0xf0;
+
+ return 0;
+}
+
void __init maple_pci_init(void)
{
struct device_node *np, *root;
@@ -605,20 +625,7 @@ void __init maple_pci_init(void)
if (ht && maple_add_bridge(ht) != 0)
of_node_put(ht);
- /* Setup the linkage between OF nodes and PHBs */
- pci_devs_phb_init();
-
- /* Fixup the PCI<->OF mapping for U3 AGP due to bus renumbering. We
- * assume there is no P2P bridge on the AGP bus, which should be a
- * safe assumptions hopefully.
- */
- if (u3_agp) {
- struct device_node *np = u3_agp->dn;
- PCI_DN(np)->busno = 0xf0;
- for (np = np->child; np; np = np->sibling)
- PCI_DN(np)->busno = 0xf0;
- }
-
+ ppc_md.pcibios_root_bridge_prepare = maple_pci_root_bridge_prepare;
/* Tell pci.c to not change any resource allocations. */
pci_add_flags(PCI_PROBE_ONLY);
}
diff --git a/arch/powerpc/platforms/pasemi/pci.c b/arch/powerpc/platforms/pasemi/pci.c
index f3a68a0..10c4e8f 100644
--- a/arch/powerpc/platforms/pasemi/pci.c
+++ b/arch/powerpc/platforms/pasemi/pci.c
@@ -229,9 +229,6 @@ void __init pas_pci_init(void)
of_node_get(np);
of_node_put(root);
-
- /* Setup the linkage between OF nodes and PHBs */
- pci_devs_phb_init();
}
void __iomem *pasemi_pci_getcfgaddr(struct pci_dev *dev, int offset)
diff --git a/arch/powerpc/platforms/powermac/pci.c b/arch/powerpc/platforms/powermac/pci.c
index 59ab16f..368716f 100644
--- a/arch/powerpc/platforms/powermac/pci.c
+++ b/arch/powerpc/platforms/powermac/pci.c
@@ -878,6 +878,29 @@ void pmac_pci_irq_fixup(struct pci_dev *dev)
#endif /* CONFIG_PPC32 */
}
+#ifdef CONFIG_PPC64
+static int pmac_pci_root_bridge_prepare(struct pci_hot_bridge *bridge)
+{
+ struct pci_controller *hose = pci_bus_to_host(bridge->bus);
+ struct device_node *np, *child;
+
+ if (hose != u3_agp)
+ return 0;
+
+ /* Fixup the PCI<->OF mapping for U3 AGP due to bus renumbering. We
+ * assume there is no P2P bridge on the AGP bus, which should be a
+ * safe assumptions for now. We should do something better in the
+ * future though
+ */
+ np = hose->dn;
+ PCI_DN(np)->busno = 0xf0;
+ for_each_child_of_node(np, child)
+ PCI_DN(child)->busno = 0xf0;
+
+ return 0;
+}
+#endif /* CONFIG_PPC64 */
+
void __init pmac_pci_init(void)
{
struct device_node *np, *root;
@@ -914,22 +937,8 @@ void __init pmac_pci_init(void)
if (ht && pmac_add_bridge(ht) != 0)
of_node_put(ht);
- /* Setup the linkage between OF nodes and PHBs */
- pci_devs_phb_init();
-
- /* Fixup the PCI<->OF mapping for U3 AGP due to bus renumbering. We
- * assume there is no P2P bridge on the AGP bus, which should be a
- * safe assumptions for now. We should do something better in the
- * future though
- */
- if (u3_agp) {
- struct device_node *np = u3_agp->dn;
- PCI_DN(np)->busno = 0xf0;
- for (np = np->child; np; np = np->sibling)
- PCI_DN(np)->busno = 0xf0;
- }
/* pmac_check_ht_link(); */
-
+ ppc_md.pcibios_root_bridge_prepare = pmac_pci_root_bridge_prepare;
#else /* CONFIG_PPC64 */
init_p2pbridge();
init_second_ohare();
diff --git a/arch/powerpc/platforms/powernv/pci.c b/arch/powerpc/platforms/powernv/pci.c
index 60e6d65..21a4eb3 100644
--- a/arch/powerpc/platforms/powernv/pci.c
+++ b/arch/powerpc/platforms/powernv/pci.c
@@ -819,9 +819,6 @@ void __init pnv_pci_init(void)
for_each_compatible_node(np, NULL, "ibm,ioda2-phb")
pnv_pci_init_ioda2_phb(np);
- /* Setup the linkage between OF nodes and PHBs */
- pci_devs_phb_init();
-
/* Configure IOMMU DMA hooks */
ppc_md.tce_build = pnv_tce_build_vm;
ppc_md.tce_free = pnv_tce_free_vm;
diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
index df6a704..5f80758 100644
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -482,7 +482,6 @@ static void __init find_and_init_phbs(void)
}
of_node_put(root);
- pci_devs_phb_init();
/*
* PCI_PROBE_ONLY and PCI_REASSIGN_ALL_BUS can be set via properties
--
Alexey
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