Re: [PATCH 02/11] PCI: Try to allocate mem64 above 4G at first

[Yinghai Lu <yinghai@kernel.org>]

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On Tue, May 29, 2012 at 1:50 PM, H. Peter Anvin <hpa@zytor.com> wrote:
>
> The bus-side address space should not be more than 32 bits no matter
> what.  As Bjorn indicates, you seem to be mixing up bus and cpu
> addresses all over the place.

please check update patches that is using converted pci bus address
for boundary checking.

Thanks

Yinghai Lu

[-- Attachment #2: pcibus_addr_converting_bus.patch --]
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Subject: [PATCH] PCI: pcibus address to resource converting take bus directly

For allocating resource under bus path, we do have dev pass along, and we
could just use bus instead.

Also add helper: pcibios_bus_addr_to_res to convert address only.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>

---
 drivers/pci/host-bridge.c |   48 +++++++++++++++++++++++++++++++++-------------
 include/linux/pci.h       |    5 ++++
 2 files changed, 40 insertions(+), 13 deletions(-)

Index: linux-2.6/drivers/pci/host-bridge.c
===================================================================
--- linux-2.6.orig/drivers/pci/host-bridge.c
+++ linux-2.6/drivers/pci/host-bridge.c
@@ -9,22 +9,19 @@
 
 #include "pci.h"
 
-static struct pci_bus *find_pci_root_bus(struct pci_dev *dev)
+static struct pci_bus *find_pci_root_bus(struct pci_bus *bus)
 {
-	struct pci_bus *bus;
-
-	bus = dev->bus;
 	while (bus->parent)
 		bus = bus->parent;
 
 	return bus;
 }
 
-static struct pci_host_bridge *find_pci_host_bridge(struct pci_dev *dev)
+static struct pci_host_bridge *find_pci_host_bridge(struct pci_bus *bus)
 {
-	struct pci_bus *bus = find_pci_root_bus(dev);
+	struct pci_bus *root_bus = find_pci_root_bus(bus);
 
-	return to_pci_host_bridge(bus->bridge);
+	return to_pci_host_bridge(root_bus->bridge);
 }
 
 void pci_set_host_bridge_release(struct pci_host_bridge *bridge,
@@ -40,10 +37,11 @@ static bool resource_contains(struct res
 	return res1->start <= res2->start && res1->end >= res2->end;
 }
 
-void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
-			     struct resource *res)
+void __pcibios_resource_to_bus(struct pci_bus *bus,
+				      struct pci_bus_region *region,
+				      struct resource *res)
 {
-	struct pci_host_bridge *bridge = find_pci_host_bridge(dev);
+	struct pci_host_bridge *bridge = find_pci_host_bridge(bus);
 	struct pci_host_bridge_window *window;
 	resource_size_t offset = 0;
 
@@ -60,6 +58,11 @@ void pcibios_resource_to_bus(struct pci_
 	region->start = res->start - offset;
 	region->end = res->end - offset;
 }
+void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
+			     struct resource *res)
+{
+	__pcibios_resource_to_bus(dev->bus, region, res);
+}
 EXPORT_SYMBOL(pcibios_resource_to_bus);
 
 static bool region_contains(struct pci_bus_region *region1,
@@ -68,10 +71,10 @@ static bool region_contains(struct pci_b
 	return region1->start <= region2->start && region1->end >= region2->end;
 }
 
-void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
-			     struct pci_bus_region *region)
+static void __pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res,
+				      struct pci_bus_region *region)
 {
-	struct pci_host_bridge *bridge = find_pci_host_bridge(dev);
+	struct pci_host_bridge *bridge = find_pci_host_bridge(bus);
 	struct pci_host_bridge_window *window;
 	resource_size_t offset = 0;
 
@@ -93,4 +96,23 @@ void pcibios_bus_to_resource(struct pci_
 	res->start = region->start + offset;
 	res->end = region->end + offset;
 }
+void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
+			     struct pci_bus_region *region)
+{
+	__pcibios_bus_to_resource(dev->bus, res, region);
+}
 EXPORT_SYMBOL(pcibios_bus_to_resource);
+
+resource_size_t pcibios_bus_addr_to_res(struct pci_bus *bus, int flags,
+					resource_size_t addr)
+{
+	struct pci_bus_region region;
+	struct resource r;
+
+	r.flags = flags;
+	region.start = addr;
+	region.end = addr;
+	__pcibios_bus_to_resource(bus, &r, &region);
+
+	return r.end;
+}
Index: linux-2.6/include/linux/pci.h
===================================================================
--- linux-2.6.orig/include/linux/pci.h
+++ linux-2.6/include/linux/pci.h
@@ -653,10 +653,15 @@ void pcibios_update_irq(struct pci_dev *
 
 /* Generic PCI functions used internally */
 
+void __pcibios_resource_to_bus(struct pci_bus *bus,
+			       struct pci_bus_region *region,
+			       struct resource *res);
 void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
 			     struct resource *res);
 void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
 			     struct pci_bus_region *region);
+resource_size_t pcibios_bus_addr_to_res(struct pci_bus *bus, int flags,
+					resource_size_t addr);
 void pcibios_scan_specific_bus(int busn);
 extern struct pci_bus *pci_find_bus(int domain, int busnr);
 void pci_bus_add_devices(const struct pci_bus *bus);

[-- Attachment #3: allocate_high_at_first_v6.patch --]
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Subject: [PATCH] PCI: Try to allocate mem64 above 4G at first

and will fall back to below 4g if it can not find any above 4g.

x86 32bit without X86_PAE support will have bottom set to 0, becuase
resource_size_t is 32bit.

Also for 32bit with resource_size_t 64bit kernel on machine with pae support
we are safe because iomem_resource is limited to 32bit according to
x86_phys_bits.

-v2: update bottom assigning to make it clear for non-pae support machine.
-v3: Bjorn's change:
        use MAX_REOURCE instead of -1
        use start/end instead of bottom/max
        for all arch instead of just x86_64
-v4: updated after PCI_MAX_RESOURCE_32 change.
-v5: restore io handling to use PCI_MAX_RESOURCE_32 as limit.
-v6: checking pcibios_resource_to_bus return for every bus res, to decide it
	if we need to try high at first.
     It support all arches instead  of just x86_64.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>

---
 arch/x86/include/asm/pci.h |    1 -
 drivers/pci/bus.c          |   42 ++++++++++++++++++++++++++++++++++--------
 drivers/pci/pci.h          |    2 ++
 include/linux/pci.h        |    4 ----
 4 files changed, 36 insertions(+), 13 deletions(-)

Index: linux-2.6/arch/x86/include/asm/pci.h
===================================================================
--- linux-2.6.orig/arch/x86/include/asm/pci.h
+++ linux-2.6/arch/x86/include/asm/pci.h
@@ -149,7 +149,6 @@ void default_restore_msi_irqs(struct pci
 
 /* generic pci stuff */
 #include <asm-generic/pci.h>
-#define PCIBIOS_MAX_MEM_32 0xffffffff
 
 #ifdef CONFIG_NUMA
 /* Returns the node based on pci bus */
Index: linux-2.6/drivers/pci/bus.c
===================================================================
--- linux-2.6.orig/drivers/pci/bus.c
+++ linux-2.6/drivers/pci/bus.c
@@ -121,15 +121,13 @@ pci_bus_alloc_resource(struct pci_bus *b
 {
 	int i, ret = -ENOMEM;
 	struct resource *r;
-	resource_size_t max = -1;
 
 	type_mask |= IORESOURCE_IO | IORESOURCE_MEM;
 
-	/* don't allocate too high if the pref mem doesn't support 64bit*/
-	if (!(res->flags & IORESOURCE_MEM_64))
-		max = PCIBIOS_MAX_MEM_32;
-
 	pci_bus_for_each_resource(bus, r, i) {
+		resource_size_t start, end, middle;
+		struct pci_bus_region region;
+
 		if (!r)
 			continue;
 
@@ -143,14 +141,42 @@ pci_bus_alloc_resource(struct pci_bus *b
 		    !(res->flags & IORESOURCE_PREFETCH))
 			continue;
 
+		/*
+		 * don't allocate too high if the pref mem doesn't
+		 * support 64bit, also if this is a 64-bit mem
+		 * resource, try above 4GB first
+		 */
+		__pcibios_resource_to_bus(bus, &region, r);
+		start = 0;
+		end = MAX_RESOURCE;
+		if (region.start <= PCI_MAX_ADDR_32 &&
+		    region.end > PCI_MAX_ADDR_32) {
+			middle = pcibios_bus_addr_to_res(bus, res->flags,
+						      PCI_MAX_ADDR_32);
+			if (res->flags & IORESOURCE_MEM_64)
+				start = middle + 1;
+			else
+				end = middle;
+		} else if (region.start > PCI_MAX_ADDR_32 &&
+			   !(res->flags & IORESOURCE_MEM_64))
+				continue;
+
+again:
 		/* Ok, try it out.. */
 		ret = allocate_resource(r, res, size,
-					r->start ? : min,
-					max, align,
+					max(start, r->start ? : min),
+					end, align,
 					alignf, alignf_data);
 		if (ret == 0)
-			break;
+			return 0;
+
+		if (start != 0) {
+			start = 0;
+			goto again;
+		}
 	}
+
+
 	return ret;
 }
 
Index: linux-2.6/drivers/pci/pci.h
===================================================================
--- linux-2.6.orig/drivers/pci/pci.h
+++ linux-2.6/drivers/pci/pci.h
@@ -208,6 +208,8 @@ enum pci_bar_type {
 	pci_bar_mem64,		/* A 64-bit memory BAR */
 };
 
+#define PCI_MAX_ADDR_32	((resource_size_t)0xffffffff)
+
 bool pci_bus_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *pl,
 				int crs_timeout);
 extern int pci_setup_device(struct pci_dev *dev);
Index: linux-2.6/include/linux/pci.h
===================================================================
--- linux-2.6.orig/include/linux/pci.h
+++ linux-2.6/include/linux/pci.h
@@ -1345,10 +1345,6 @@ static inline int pci_domain_nr(struct p
 
 #include <asm/pci.h>
 
-#ifndef PCIBIOS_MAX_MEM_32
-#define PCIBIOS_MAX_MEM_32 (-1)
-#endif
-
 /* these helpers provide future and backwards compatibility
  * for accessing popular PCI BAR info */
 #define pci_resource_start(dev, bar)	((dev)->resource[(bar)].start)