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Subject[patch] 2.5.14: New PCI allocation code (alpha, arm, parisc) [1/2]
This changes PCI resource allocation algorithm to 3 passes vs.
current 2 passes. Extra pass is used for calculation of required
size and alignment of PCI buses behind PCI-PCI bridges. After
that, in the pass #3, these buses get allocated like regular
PCI devices. This gives tighter PCI IO and memory packing -
for instance, this fixes allocation problems on certain alphas
with very small (112Mb) PCI memory range. Also, the new code
- will allow mixed approach to resource allocation:
architecture can keep BIOS settings for some devices,
and re-allocate resources for others, including improperly
initialized bridges;
- makes prefetchable ranges support much simpler;
- allows sizing of IO and memory ranges for the host
bridges, which might be very useful in some situations.

It was tested on various alphas; I haven't heard any complaints
from rmk and rth, so probably all of this is ok. :-)

Part 1:
- for all archs, 4th argument (align) added to
pcibios_align_resource (and its callers).
It's necessary because this function will be called for
bus resources as well, and in this case size != alignment.
- for several archs, dead/bogus code removed from
pcibios_fixup_pbus_ranges().

Ivan.

--- 2.5.14/arch/i386/kernel/pci-i386.c Fri May 3 04:22:45 2002
+++ linux/arch/i386/kernel/pci-i386.c Sun May 5 18:40:21 2002
@@ -136,7 +136,8 @@ pcibios_update_resource(struct pci_dev *
* which might have be mirrored at 0x0100-0x03ff..
*/
void
-pcibios_align_resource(void *data, struct resource *res, unsigned long size)
+pcibios_align_resource(void *data, struct resource *res,
+ unsigned long size, unsigned long align)
{
if (res->flags & IORESOURCE_IO) {
unsigned long start = res->start;
--- 2.5.14/arch/sparc64/kernel/pci.c Fri May 3 04:22:37 2002
+++ linux/arch/sparc64/kernel/pci.c Sun May 5 18:40:21 2002
@@ -311,7 +311,8 @@ void pcibios_fixup_pbus_ranges(struct pc
{
}

-void pcibios_align_resource(void *data, struct resource *res, unsigned long size)
+void pcibios_align_resource(void *data, struct resource *res,
+ unsigned long size, unsigned long align)
{
}

--- 2.5.14/arch/ppc/kernel/pci.c Fri May 3 04:22:52 2002
+++ linux/arch/ppc/kernel/pci.c Sun May 5 18:40:21 2002
@@ -1083,10 +1083,6 @@ common_swizzle(struct pci_dev *dev, unsi
void __init
pcibios_fixup_pbus_ranges(struct pci_bus * bus, struct pbus_set_ranges_data * ranges)
{
- ranges->io_start -= bus->resource[0]->start;
- ranges->io_end -= bus->resource[0]->start;
- ranges->mem_start -= bus->resource[1]->start;
- ranges->mem_end -= bus->resource[1]->start;
}

unsigned long resource_fixup(struct pci_dev * dev, struct resource * res,
--- 2.5.14/arch/mips/kernel/pci.c Fri May 3 04:22:43 2002
+++ linux/arch/mips/kernel/pci.c Sun May 5 18:40:21 2002
@@ -161,7 +161,8 @@ char *pcibios_setup(char *str)
}

void
-pcibios_align_resource(void *data, struct resource *res, unsigned long size)
+pcibios_align_resource(void *data, struct resource *res,
+ unsigned long size, unsigned long align)
{
/* this should not be called */
}
--- 2.5.14/arch/mips/ite-boards/generic/it8172_pci.c Fri May 3 04:22:55 2002
+++ linux/arch/mips/ite-boards/generic/it8172_pci.c Sun May 5 18:40:21 2002
@@ -241,7 +241,8 @@ pcibios_enable_device(struct pci_dev *de


void __init
-pcibios_align_resource(void *data, struct resource *res, unsigned long size)
+pcibios_align_resource(void *data, struct resource *res,
+ unsigned long size, unsigned long align)
{
printk("pcibios_align_resource\n");
}
--- 2.5.14/arch/mips/mips-boards/generic/pci.c Fri May 3 04:22:50 2002
+++ linux/arch/mips/mips-boards/generic/pci.c Mon May 6 21:28:07 2002
@@ -286,7 +286,8 @@ pcibios_enable_device(struct pci_dev *de
}

void __init
-pcibios_align_resource(void *data, struct resource *res, unsigned long size)
+pcibios_align_resource(void *data, struct resource *res,
+ unsigned long size, unsigned long align)
{
}

--- 2.5.14/arch/mips/ddb5xxx/common/pci.c Fri May 3 04:22:57 2002
+++ linux/arch/mips/ddb5xxx/common/pci.c Sun May 5 18:40:21 2002
@@ -164,7 +164,8 @@ char *pcibios_setup(char *str)
}

void
-pcibios_align_resource(void *data, struct resource *res, unsigned long size)
+pcibios_align_resource(void *data, struct resource *res,
+ unsigned long size, unsigned long align)
{
/* this should not be called */
MIPS_ASSERT(1 == 0);
--- 2.5.14/arch/mips/gt64120/common/pci.c Fri May 3 04:22:53 2002
+++ linux/arch/mips/gt64120/common/pci.c Mon May 6 21:27:03 2002
@@ -886,7 +886,7 @@ void pcibios_update_resource(struct pci_
}

void pcibios_align_resource(void *data, struct resource *res,
- unsigned long size)
+ unsigned long size, unsigned long align)
{
struct pci_dev *dev = data;

--- 2.5.14/arch/mips/ddb5074/pci.c Fri May 3 04:22:53 2002
+++ linux/arch/mips/ddb5074/pci.c Sun May 5 18:40:21 2002
@@ -319,10 +319,6 @@ void __init pcibios_update_irq(struct pc
void __init pcibios_fixup_pbus_ranges(struct pci_bus *bus,
struct pbus_set_ranges_data *ranges)
{
- ranges->io_start -= bus->resource[0]->start;
- ranges->io_end -= bus->resource[0]->start;
- ranges->mem_start -= bus->resource[1]->start;
- ranges->mem_end -= bus->resource[1]->start;
}

int pcibios_enable_resources(struct pci_dev *dev)
@@ -396,7 +392,7 @@ void pcibios_update_resource(struct pci_
}

void pcibios_align_resource(void *data, struct resource *res,
- unsigned long size)
+ unsigned long size, unsigned long align)
{
struct pci_dev *dev = data;

--- 2.5.14/arch/mips/ddb5476/pci.c Fri May 3 04:22:49 2002
+++ linux/arch/mips/ddb5476/pci.c Sun May 5 18:40:21 2002
@@ -470,7 +470,7 @@ void pcibios_update_resource(struct pci_
}

void pcibios_align_resource(void *data, struct resource *res,
- unsigned long size)
+ unsigned long size, unsigned long align)
{
struct pci_dev *dev = data;

--- 2.5.14/arch/mips/sni/pci.c Fri May 3 04:22:54 2002
+++ linux/arch/mips/sni/pci.c Sun May 5 18:40:21 2002
@@ -199,7 +199,8 @@ int __init pcibios_enable_device(struct
}

void __init
-pcibios_align_resource(void *data, struct resource *res, unsigned long size)
+pcibios_align_resource(void *data, struct resource *res,
+ unsigned long size, unsigned long align)
{
}

--- 2.5.14/arch/alpha/kernel/pci.c Fri May 3 04:22:40 2002
+++ linux/arch/alpha/kernel/pci.c Mon May 6 21:34:29 2002
@@ -128,7 +128,8 @@ struct pci_fixup pcibios_fixups[] __init
#define GB (1024*MB)

void
-pcibios_align_resource(void *data, struct resource *res, unsigned long size)
+pcibios_align_resource(void *data, struct resource *res,
+ unsigned long size, unsigned long align)
{
struct pci_dev *dev = data;
struct pci_controller *hose = dev->sysdata;
@@ -168,7 +169,7 @@ pcibios_align_resource(void *data, struc
*/

/* Align to multiple of size of minimum base. */
- alignto = MAX(0x1000, size);
+ alignto = MAX(0x1000, align);
start = ALIGN(start, alignto);
if (hose->sparse_mem_base && size <= 7 * 16*MB) {
if (((start / (16*MB)) & 0x7) == 0) {
--- 2.5.14/arch/sparc/kernel/pcic.c Fri May 3 04:22:37 2002
+++ linux/arch/sparc/kernel/pcic.c Mon May 6 21:26:04 2002
@@ -865,7 +865,8 @@ void pcibios_update_resource(struct pci_
{
}

-void pcibios_align_resource(void *data, struct resource *res, unsigned long size)
+void pcibios_align_resource(void *data, struct resource *res,
+ unsigned long size, unsigned long align)
{
}

--- 2.5.14/arch/x86_64/kernel/pci-x86_64.c Fri May 3 04:22:57 2002
+++ linux/arch/x86_64/kernel/pci-x86_64.c Sun May 5 18:40:21 2002
@@ -136,7 +136,8 @@ pcibios_update_resource(struct pci_dev *
* which might have be mirrored at 0x0100-0x03ff..
*/
void
-pcibios_align_resource(void *data, struct resource *res, unsigned long size)
+pcibios_align_resource(void *data, struct resource *res,
+ unsigned long size, unsigned long align)
{
if (res->flags & IORESOURCE_IO) {
unsigned long start = res->start;
--- 2.5.14/arch/ia64/kernel/pci.c Fri May 3 04:22:52 2002
+++ linux/arch/ia64/kernel/pci.c Sun May 5 18:40:21 2002
@@ -259,10 +259,6 @@ pcibios_update_irq (struct pci_dev *dev,
void __init
pcibios_fixup_pbus_ranges (struct pci_bus * bus, struct pbus_set_ranges_data * ranges)
{
- ranges->io_start -= bus->resource[0]->start;
- ranges->io_end -= bus->resource[0]->start;
- ranges->mem_start -= bus->resource[1]->start;
- ranges->mem_end -= bus->resource[1]->start;
}

int
@@ -278,7 +274,8 @@ pcibios_enable_device (struct pci_dev *d
}

void
-pcibios_align_resource (void *data, struct resource *res, unsigned long size)
+pcibios_align_resource (void *data, struct resource *res,
+ unsigned long size, unsigned long align)
{
}

--- 2.5.14/arch/arm/kernel/bios32.c Fri May 3 04:22:50 2002
+++ linux/arch/arm/kernel/bios32.c Mon May 6 21:34:29 2002
@@ -662,7 +662,8 @@ char * __init pcibios_setup(char *str)
* but we want to try to avoid allocating at 0x2900-0x2bff
* which might be mirrored at 0x0100-0x03ff..
*/
-void pcibios_align_resource(void *data, struct resource *res, unsigned long size)
+void pcibios_align_resource(void *data, struct resource *res,
+ unsigned long size, unsigned long align)
{
if (res->flags & IORESOURCE_IO) {
unsigned long start = res->start;
--- 2.5.14/arch/mips64/sgi-ip27/ip27-pci.c Fri May 3 04:22:55 2002
+++ linux/arch/mips64/sgi-ip27/ip27-pci.c Sun May 5 18:40:21 2002
@@ -238,10 +238,6 @@ void __init
pcibios_fixup_pbus_ranges(struct pci_bus * bus,
struct pbus_set_ranges_data * ranges)
{
- ranges->io_start -= bus->resource[0]->start;
- ranges->io_end -= bus->resource[0]->start;
- ranges->mem_start -= bus->resource[1]->start;
- ranges->mem_end -= bus->resource[1]->start;
}

int __init
@@ -252,7 +248,8 @@ pcibios_enable_device(struct pci_dev *de
}

void __init
-pcibios_align_resource(void *data, struct resource *res, unsigned long size)
+pcibios_align_resource(void *data, struct resource *res,
+ unsigned long size, unsigned long align)
{
}

--- 2.5.14/arch/mips64/mips-boards/generic/pci.c Fri May 3 04:22:41 2002
+++ linux/arch/mips64/mips-boards/generic/pci.c Sun May 5 18:40:21 2002
@@ -290,7 +290,8 @@ pcibios_enable_device(struct pci_dev *de
}

void __init
-pcibios_align_resource(void *data, struct resource *res, unsigned long size)
+pcibios_align_resource(void *data, struct resource *res,
+ unsigned long size, unsigned long align)
{
}

--- 2.5.14/arch/mips64/sgi-ip32/ip32-pci.c Fri May 3 04:22:58 2002
+++ linux/arch/mips64/sgi-ip32/ip32-pci.c Sun May 5 18:40:21 2002
@@ -329,7 +329,7 @@ char * __init pcibios_setup (char *str)
}

void __init pcibios_align_resource (void *data, struct resource *res,
- unsigned long size)
+ unsigned long size, unsigned long align)
{
}

@@ -352,10 +352,6 @@ void __init pcibios_fixup_bus (struct pc
void __init pcibios_fixup_pbus_ranges(struct pci_bus * bus,
struct pbus_set_ranges_data * ranges)
{
- ranges->io_start -= bus->resource[0]->start;
- ranges->io_end -= bus->resource[0]->start;
- ranges->mem_start -= bus->resource[1]->start;
- ranges->mem_end -= bus->resource[1]->start;
}

/*
--- 2.5.14/arch/ppc64/kernel/pci.c Fri May 3 04:22:47 2002
+++ linux/arch/ppc64/kernel/pci.c Mon May 6 21:24:50 2002
@@ -180,7 +180,8 @@ pcibios_fixup_resources(struct pci_dev*
* which might have be mirrored at 0x0100-0x03ff..
*/
void
-pcibios_align_resource(void *data, struct resource *res, unsigned long size)
+pcibios_align_resource(void *data, struct resource *res,
+ unsigned long size, unsigned long align)
{
struct pci_dev *dev = data;

--- 2.5.14/arch/sh/kernel/pci_st40.c Fri May 3 04:22:56 2002
+++ linux/arch/sh/kernel/pci_st40.c Sun May 5 18:40:21 2002
@@ -414,10 +414,6 @@ void __init
pcibios_fixup_pbus_ranges(struct pci_bus *bus,
struct pbus_set_ranges_data *ranges)
{
- ranges->io_start -= bus->resource[0]->start;
- ranges->io_end -= bus->resource[0]->start;
- ranges->mem_start -= bus->resource[1]->start;
- ranges->mem_end -= bus->resource[1]->start;
}

void __init pcibios_init(void)
--- 2.5.14/arch/sh/kernel/pcibios.c Fri May 3 04:22:47 2002
+++ linux/arch/sh/kernel/pcibios.c Mon May 6 21:23:52 2002
@@ -60,7 +60,8 @@ pcibios_update_resource(struct pci_dev *
* addresses to be allocated in the 0x000-0x0ff region
* modulo 0x400.
*/
-void pcibios_align_resource(void *data, struct resource *res, unsigned long size)
+void pcibios_align_resource(void *data, struct resource *res,
+ unsigned long size, unsigned long align)
{
if (res->flags & IORESOURCE_IO) {
unsigned long start = res->start;
--- 2.5.14/arch/parisc/kernel/pci.c Fri May 3 04:22:38 2002
+++ linux/arch/parisc/kernel/pci.c Sun May 5 18:40:21 2002
@@ -337,13 +337,15 @@ void pcibios_fixup_pbus_ranges(
** than res->start.
*/
void __devinit
-pcibios_align_resource(void *data, struct resource *res, unsigned long size)
+pcibios_align_resource(void *data, struct resource *res,
+ unsigned long size, unsigned long alignment)
{
unsigned long mask, align;

- DBG_RES("pcibios_align_resource(%s, (%p) [%lx,%lx]/%x, 0x%lx)\n",
+ DBG_RES("pcibios_align_resource(%s, (%p) [%lx,%lx]/%x, 0x%lx, 0x%lx)\n",
((struct pci_dev *) data)->slot_name,
- res->parent, res->start, res->end, (int) res->flags, size);
+ res->parent, res->start, res->end,
+ (int) res->flags, size, alignment);

/* has resource already been aligned/assigned? */
if (res->parent)
@@ -400,11 +402,11 @@ pcibios_size_bridge(struct pci_bus *bus,

if (res.flags & IORESOURCE_IO) {
res.start = inner.io_end;
- pcibios_align_resource(dev, &res, size);
+ pcibios_align_resource(dev, &res, size, 0);
inner.io_end += res.start + size;
} else if (res.flags & IORESOURCE_MEM) {
res.start = inner.mem_end;
- pcibios_align_resource(dev, &res, size);
+ pcibios_align_resource(dev, &res, size, 0);
inner.mem_end = res.start + size;
}

--- 2.5.14/include/linux/ioport.h Fri May 3 04:22:44 2002
+++ linux/include/linux/ioport.h Sun May 5 18:40:21 2002
@@ -92,7 +92,8 @@ extern int allocate_resource(struct reso
unsigned long size,
unsigned long min, unsigned long max,
unsigned long align,
- void (*alignf)(void *, struct resource *, unsigned long),
+ void (*alignf)(void *, struct resource *,
+ unsigned long, unsigned long),
void *alignf_data);

/* Convenience shorthand with allocation */
--- 2.5.14/include/linux/pci.h Fri May 3 04:22:52 2002
+++ linux/include/linux/pci.h Mon May 6 21:34:29 2002
@@ -501,7 +501,8 @@ int pcibios_enable_device(struct pci_dev
char *pcibios_setup (char *str);

/* Used only when drivers/pci/setup.c is used */
-void pcibios_align_resource(void *, struct resource *, unsigned long);
+void pcibios_align_resource(void *, struct resource *,
+ unsigned long, unsigned long);
void pcibios_update_resource(struct pci_dev *, struct resource *,
struct resource *, int);
void pcibios_update_irq(struct pci_dev *, int irq);
--- 2.5.14/drivers/pci/setup-res.c Fri May 3 04:22:47 2002
+++ linux/drivers/pci/setup-res.c Mon May 6 21:34:29 2002
@@ -69,6 +69,7 @@ static int pci_assign_bus_resource(const
unsigned int type_mask,
int resno)
{
+ unsigned long align;
int i;

type_mask |= IORESOURCE_IO | IORESOURCE_MEM;
@@ -81,12 +82,20 @@ static int pci_assign_bus_resource(const
if ((res->flags ^ r->flags) & type_mask)
continue;

- /* We cannot allocate a non-prefetching resource from a pre-fetching area */
- if ((r->flags & IORESOURCE_PREFETCH) && !(res->flags & IORESOURCE_PREFETCH))
+ /* We cannot allocate a non-prefetching resource
+ from a pre-fetching area */
+ if ((r->flags & IORESOURCE_PREFETCH) &&
+ !(res->flags & IORESOURCE_PREFETCH))
continue;

+ /* The bridge resources are special, as their
+ size != alignment. Sizing routines return
+ required alignment in the "start" field. */
+ align = (resno < PCI_BRIDGE_RESOURCES) ? size : res->start;
+
/* Ok, try it out.. */
- if (allocate_resource(r, res, size, min, -1, size, pcibios_align_resource, dev) < 0)
+ if (allocate_resource(r, res, size, min, -1, align,
+ pcibios_align_resource, dev) < 0)
continue;

/* Update PCI config space. */
--- 2.5.14/kernel/resource.c Fri May 3 04:22:41 2002
+++ linux/kernel/resource.c Sun May 5 18:40:21 2002
@@ -152,7 +152,8 @@ static int find_resource(struct resource
unsigned long size,
unsigned long min, unsigned long max,
unsigned long align,
- void (*alignf)(void *, struct resource *, unsigned long),
+ void (*alignf)(void *, struct resource *,
+ unsigned long, unsigned long),
void *alignf_data)
{
struct resource *this = root->child;
@@ -169,7 +170,7 @@ static int find_resource(struct resource
new->end = max;
new->start = (new->start + align - 1) & ~(align - 1);
if (alignf)
- alignf(alignf_data, new, size);
+ alignf(alignf_data, new, size, align);
if (new->start < new->end && new->end - new->start + 1 >= size) {
new->end = new->start + size - 1;
return 0;
@@ -189,7 +190,8 @@ int allocate_resource(struct resource *r
unsigned long size,
unsigned long min, unsigned long max,
unsigned long align,
- void (*alignf)(void *, struct resource *, unsigned long),
+ void (*alignf)(void *, struct resource *,
+ unsigned long, unsigned long),
void *alignf_data)
{
int err;
-
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