On Sun, May 10, 2015 at 12:55:51AM +1000, Alexey Kardashevskiy wrote:
>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"?
>
It's already in "Delay creating pci_dn", isn't it? :-)
>
>>+
>>+/*
>> * 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
>>
Thanks,
Gavin
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