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Subject[PATCH/RFT] finish i386 and x86-64 sysdata conversion
This patch finishes the i386 and x86-64 ->sysdata conversion and
hopefully also fixes Riku's and Andy's observed bugs. It is based on
Yinghai Lu's and Andy Whitcroft's patches (thanks!) with some changes:

- introduce pci_scan_bus_with_sysdata() and use it instead of
pci_scan_bus() where appropriate. pci_scan_bus_with_sysdata() will
allocate the sysdata structure and then call pci_scan_bus().
- always allocate pci_sysdata dynamically. The whole point of this
sysdata work is to make it easy to do root-bus specific things
(e.g., support PCI domains and IOMMU's). I dislike using a default
struct pci_sysdata in some places and a dynamically allocated
pci_sysdata elsewhere - the potential for someone indavertantly
changing the default structure is too high.
- this patch only makes the minimal changes necessary, i.e., the NUMA node is
always initialized to -1. Patches to do the right thing with regards
to the NUMA node can build on top of this (either add a 'node'
parameter to pci_scan_bus_with_sysdata() or just update the node
when it becomes known).

The patch was compile tested with various configurations (e.g., NUMAQ,
VISWS) and run-time tested on i386 and x86-64. Unfortunately none of
my machines exhibited the bugs so caveat emptor.

Andy, could you please see if this fixes the NUMA issues you've seen?
Riku, does this fix "pci=noacpi" on your laptop?

Comments appreciated. If this looks ok it should go into 2.6.23.

Signed-off-by: Muli Ben-Yehuda <muli@il.ibm.com>
Cc: Yinghai Lu <yhlu.kernel@gmail.com>
Cc: Andi Kleen <ak@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Chuck Ebbert <cebbert@redhat.com>,
Cc: riku.seppala@kymp.net
Cc: Andy Whitcroft <apw@shadowen.org>
Cc: Jeff Garzik <jeff@garzik.org>
---
arch/i386/pci/common.c | 23 +++++++++++++++++++++++
arch/i386/pci/fixup.c | 6 +++---
arch/i386/pci/irq.c | 5 +++--
arch/i386/pci/legacy.c | 2 +-
arch/i386/pci/numa.c | 15 +++++++++------
arch/i386/pci/visws.c | 4 ++--
include/asm-i386/pci.h | 3 +++
include/asm-x86_64/pci.h | 2 ++
8 files changed, 46 insertions(+), 14 deletions(-)

diff --git a/arch/i386/pci/common.c b/arch/i386/pci/common.c
index 85503de..ebc6f3c 100644
--- a/arch/i386/pci/common.c
+++ b/arch/i386/pci/common.c
@@ -455,3 +455,26 @@ void pcibios_disable_device (struct pci_dev *dev)
if (!dev->msi_enabled && pcibios_disable_irq)
pcibios_disable_irq(dev);
}
+
+struct pci_bus *pci_scan_bus_with_sysdata(int busno)
+{
+ struct pci_bus *bus = NULL;
+ struct pci_sysdata *sd;
+
+ /*
+ * Allocate per-root-bus (not per bus) arch-specific data.
+ * TODO: leak; this memory is never freed.
+ * It's arguable whether it's worth the trouble to care.
+ */
+ sd = kzalloc(sizeof(*sd), GFP_KERNEL);
+ if (!sd) {
+ printk(KERN_ERR "PCI: OOM, skipping PCI bus %02x\n", busno);
+ return NULL;
+ }
+ sd->node = -1;
+ bus = pci_scan_bus(busno, &pci_root_ops, sd);
+ if (!bus)
+ kfree(sd);
+
+ return bus;
+}
diff --git a/arch/i386/pci/fixup.c b/arch/i386/pci/fixup.c
index e7306db..c82cbf4 100644
--- a/arch/i386/pci/fixup.c
+++ b/arch/i386/pci/fixup.c
@@ -25,9 +25,9 @@ static void __devinit pci_fixup_i450nx(struct pci_dev *d)
pci_read_config_byte(d, reg++, &subb);
DBG("i450NX PXB %d: %02x/%02x/%02x\n", pxb, busno, suba, subb);
if (busno)
- pci_scan_bus(busno, &pci_root_ops, NULL); /* Bus A */
+ pci_scan_bus_with_sysdata(busno); /* Bus A */
if (suba < subb)
- pci_scan_bus(suba+1, &pci_root_ops, NULL); /* Bus B */
+ pci_scan_bus_with_sysdata(suba+1); /* Bus B */
}
pcibios_last_bus = -1;
}
@@ -42,7 +42,7 @@ static void __devinit pci_fixup_i450gx(struct pci_dev *d)
u8 busno;
pci_read_config_byte(d, 0x4a, &busno);
printk(KERN_INFO "PCI: i440KX/GX host bridge %s: secondary bus %02x\n", pci_name(d), busno);
- pci_scan_bus(busno, &pci_root_ops, NULL);
+ pci_scan_bus_with_sysdata(busno);
pcibios_last_bus = -1;
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82454GX, pci_fixup_i450gx);
diff --git a/arch/i386/pci/irq.c b/arch/i386/pci/irq.c
index f2cb942..665db06 100644
--- a/arch/i386/pci/irq.c
+++ b/arch/i386/pci/irq.c
@@ -138,8 +138,9 @@ static void __init pirq_peer_trick(void)
for(i = 1; i < 256; i++) {
if (!busmap[i] || pci_find_bus(0, i))
continue;
- if (pci_scan_bus(i, &pci_root_ops, NULL))
- printk(KERN_INFO "PCI: Discovered primary peer bus %02x [IRQ]\n", i);
+ if (pci_scan_bus_with_sysdata(i))
+ printk(KERN_INFO "PCI: Discovered primary peer "
+ "bus %02x [IRQ]\n", i);
}
pcibios_last_bus = -1;
}
diff --git a/arch/i386/pci/legacy.c b/arch/i386/pci/legacy.c
index 149a958..5565d70 100644
--- a/arch/i386/pci/legacy.c
+++ b/arch/i386/pci/legacy.c
@@ -26,7 +26,7 @@ static void __devinit pcibios_fixup_peer_bridges(void)
l != 0x0000 && l != 0xffff) {
DBG("Found device at %02x:%02x [%04x]\n", n, devfn, l);
printk(KERN_INFO "PCI: Discovered peer bus %02x\n", n);
- pci_scan_bus(n, &pci_root_ops, NULL);
+ pci_scan_bus_with_sysdata(n);
break;
}
}
diff --git a/arch/i386/pci/numa.c b/arch/i386/pci/numa.c
index adbe17a..f5f165f 100644
--- a/arch/i386/pci/numa.c
+++ b/arch/i386/pci/numa.c
@@ -96,10 +96,14 @@ static void __devinit pci_fixup_i450nx(struct pci_dev *d)
pci_read_config_byte(d, reg++, &suba);
pci_read_config_byte(d, reg++, &subb);
DBG("i450NX PXB %d: %02x/%02x/%02x\n", pxb, busno, suba, subb);
- if (busno)
- pci_scan_bus(QUADLOCAL2BUS(quad,busno), &pci_root_ops, NULL); /* Bus A */
- if (suba < subb)
- pci_scan_bus(QUADLOCAL2BUS(quad,suba+1), &pci_root_ops, NULL); /* Bus B */
+ if (busno) {
+ /* Bus A */
+ pci_scan_bus_with_sysdata(QUADLOCAL2BUS(quad, busno));
+ }
+ if (suba < subb) {
+ /* Bus B */
+ pci_scan_bus_with_sysdata(QUADLOCAL2BUS(quad, suba+1));
+ }
}
pcibios_last_bus = -1;
}
@@ -123,8 +127,7 @@ static int __init pci_numa_init(void)
continue;
printk("Scanning PCI bus %d for quad %d\n",
QUADLOCAL2BUS(quad,0), quad);
- pci_scan_bus(QUADLOCAL2BUS(quad,0),
- &pci_root_ops, NULL);
+ pci_scan_bus_with_sysdata(QUADLOCAL2BUS(quad, 0));
}
return 0;
}
diff --git a/arch/i386/pci/visws.c b/arch/i386/pci/visws.c
index f1b486d..8ecb1c7 100644
--- a/arch/i386/pci/visws.c
+++ b/arch/i386/pci/visws.c
@@ -101,8 +101,8 @@ static int __init pcibios_init(void)
"bridge B (PIIX4) bus: %u\n", pci_bus1, pci_bus0);

raw_pci_ops = &pci_direct_conf1;
- pci_scan_bus(pci_bus0, &pci_root_ops, NULL);
- pci_scan_bus(pci_bus1, &pci_root_ops, NULL);
+ pci_scan_bus_with_sysdata(pci_bus0);
+ pci_scan_bus_with_sysdata(pci_bus1);
pci_fixup_irqs(visws_swizzle, visws_map_irq);
pcibios_resource_survey();
return 0;
diff --git a/include/asm-i386/pci.h b/include/asm-i386/pci.h
index d790343..4fcacc7 100644
--- a/include/asm-i386/pci.h
+++ b/include/asm-i386/pci.h
@@ -8,6 +8,9 @@ struct pci_sysdata {
int node; /* NUMA node */
};

+/* scan a bus after allocating a pci_sysdata for it */
+extern struct pci_bus *pci_scan_bus_with_sysdata(int busno);
+
#include <linux/mm.h> /* for struct page */

/* Can be used to override the logic in pci_scan_bus for skipping
diff --git a/include/asm-x86_64/pci.h b/include/asm-x86_64/pci.h
index 88926eb..5da8cb0 100644
--- a/include/asm-x86_64/pci.h
+++ b/include/asm-x86_64/pci.h
@@ -10,6 +10,8 @@ struct pci_sysdata {
void* iommu; /* IOMMU private data */
};

+extern struct pci_bus *pci_scan_bus_with_sysdata(int busno);
+
#ifdef CONFIG_CALGARY_IOMMU
static inline void* pci_iommu(struct pci_bus *bus)
{
--
1.5.2


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