The patch titled
pci: clean up resource alignment management
has been added to the -mm tree. Its filename is
pci-clean-up-resource-alignment-management.patch
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------------------------------------------------------
Subject: pci: clean up resource alignment management
From: Ivan Kokshaysky <ink@xxxxxxxxxxxxxxxxxxxx>
Done per Linus' request and suggestions. Linus has explained that
better than I'll be able to explain:
On Thu, Mar 27, 2008 at 10:12:10AM -0700, Linus Torvalds wrote:
> Actually, before we go any further, there might be a less intrusive
> alternative: add just a couple of flags to the resource flags field (we
> still have something like 8 unused bits on 32-bit), and use those to
> implement a generic "resource_alignment()" routine.
>
> Two flags would do it:
>
> - IORESOURCE_SIZEALIGN: size indicates alignment (regular PCI device
> resources)
>
> - IORESOURCE_STARTALIGN: start field is alignment (PCI bus resources
> during probing)
>
> and then the case of both flags zero (or both bits set) would actually be
> "invalid", and we would also clear the IORESOURCE_STARTALIGN flag when we
> actually allocate the resource (so that we don't use the "start" field as
> alignment incorrectly when it no longer indicates alignment).
>
> That wouldn't be totally generic, but it would have the nice property of
> automatically at least add sanity checking for that whole "res->start has
> the odd meaning of 'alignment' during probing" and remove the need for a
> new field, and it would allow us to have a generic "resource_alignment()"
> routine that just gets a resource pointer.
Besides, I removed IORESOURCE_BUS_HAS_VGA flag which was unused for ages.
Signed-off-by: Ivan Kokshaysky <ink@xxxxxxxxxxxxxxxxxxxx>
Cc: Gary Hade <garyhade@xxxxxxxxxx>
Cc: Greg KH <greg@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/pci/probe.c | 5 ++--
drivers/pci/setup-bus.c | 3 ++
drivers/pci/setup-res.c | 42 ++++++++++++++++++++------------------
include/linux/ioport.h | 5 +++-
kernel/resource.c | 18 ++++++++++++++++
5 files changed, 51 insertions(+), 22 deletions(-)
diff -puN drivers/pci/probe.c~pci-clean-up-resource-alignment-management drivers/pci/probe.c
--- a/drivers/pci/probe.c~pci-clean-up-resource-alignment-management
+++ a/drivers/pci/probe.c
@@ -235,7 +235,7 @@ static void pci_read_bases(struct pci_de
res->flags |= l & ~PCI_BASE_ADDRESS_IO_MASK;
}
res->end = res->start + (unsigned long) sz;
- res->flags |= pci_calc_resource_flags(l);
+ res->flags |= pci_calc_resource_flags(l) | IORESOURCE_SIZEALIGN;
if (is_64bit_memory(l)) {
u32 szhi, lhi;
@@ -288,7 +288,8 @@ static void pci_read_bases(struct pci_de
if (sz) {
res->flags = (l & IORESOURCE_ROM_ENABLE) |
IORESOURCE_MEM | IORESOURCE_PREFETCH |
- IORESOURCE_READONLY | IORESOURCE_CACHEABLE;
+ IORESOURCE_READONLY | IORESOURCE_CACHEABLE |
+ IORESOURCE_SIZEALIGN;
res->start = l & PCI_ROM_ADDRESS_MASK;
res->end = res->start + (unsigned long) sz;
}
diff -puN drivers/pci/setup-bus.c~pci-clean-up-resource-alignment-management drivers/pci/setup-bus.c
--- a/drivers/pci/setup-bus.c~pci-clean-up-resource-alignment-management
+++ a/drivers/pci/setup-bus.c
@@ -65,6 +65,7 @@ static void pbus_assign_resources_sorted
res = list->res;
idx = res - &list->dev->resource[0];
if (pci_assign_resource(list->dev, idx)) {
+ /* FIXME: get rid of this */
res->start = 0;
res->end = 0;
res->flags = 0;
@@ -326,6 +327,7 @@ static void pbus_size_io(struct pci_bus
/* Alignment of the IO window is always 4K */
b_res->start = 4096;
b_res->end = b_res->start + size - 1;
+ b_res->flags |= IORESOURCE_STARTALIGN;
}
/* Calculate the size of the bus and minimal alignment which
@@ -400,6 +402,7 @@ static int pbus_size_mem(struct pci_bus
}
b_res->start = min_align;
b_res->end = size + min_align - 1;
+ b_res->flags |= IORESOURCE_STARTALIGN;
return 1;
}
diff -puN drivers/pci/setup-res.c~pci-clean-up-resource-alignment-management drivers/pci/setup-res.c
--- a/drivers/pci/setup-res.c~pci-clean-up-resource-alignment-management
+++ a/drivers/pci/setup-res.c
@@ -137,10 +137,16 @@ int pci_assign_resource(struct pci_dev *
size = res->end - res->start + 1;
min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
- /* 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;
+
+ align = resource_alignment(res);
+ if (!align) {
+ printk(KERN_ERR "PCI: Cannot allocate resource (bogus "
+ "alignment) %d [%llx:%llx] (flags %lx) of %s\n",
+ resno, (unsigned long long)res->start,
+ (unsigned long long)res->end, res->flags,
+ pci_name(dev));
+ return -EINVAL;
+ }
/* First, try exact prefetching match.. */
ret = pci_bus_alloc_resource(bus, res, size, align, min,
@@ -164,8 +170,10 @@ int pci_assign_resource(struct pci_dev *
res->flags & IORESOURCE_IO ? "I/O" : "mem",
resno, (unsigned long long)size,
(unsigned long long)res->start, pci_name(dev));
- } else if (resno < PCI_BRIDGE_RESOURCES) {
- pci_update_resource(dev, res, resno);
+ } else {
+ res->flags &= ~IORESOURCE_STARTALIGN;
+ if (resno < PCI_BRIDGE_RESOURCES)
+ pci_update_resource(dev, res, resno);
}
return ret;
@@ -226,29 +234,25 @@ void pdev_sort_resources(struct pci_dev
if (r->flags & IORESOURCE_PCI_FIXED)
continue;
- r_align = r->end - r->start;
-
if (!(r->flags) || r->parent)
continue;
+
+ r_align = resource_alignment(r);
if (!r_align) {
- printk(KERN_WARNING "PCI: Ignore bogus resource %d "
- "[%llx:%llx] of %s\n",
+ printk(KERN_WARNING "PCI: bogus alignment of resource "
+ "%d [%llx:%llx] (flags %lx) of %s\n",
i, (unsigned long long)r->start,
- (unsigned long long)r->end, pci_name(dev));
+ (unsigned long long)r->end, r->flags,
+ pci_name(dev));
continue;
}
- r_align = (i < PCI_BRIDGE_RESOURCES) ? r_align + 1 : r->start;
for (list = head; ; list = list->next) {
resource_size_t align = 0;
struct resource_list *ln = list->next;
- int idx;
- if (ln) {
- idx = ln->res - &ln->dev->resource[0];
- align = (idx < PCI_BRIDGE_RESOURCES) ?
- ln->res->end - ln->res->start + 1 :
- ln->res->start;
- }
+ if (ln)
+ align = resource_alignment(ln->res);
+
if (r_align > align) {
tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
if (!tmp)
diff -puN include/linux/ioport.h~pci-clean-up-resource-alignment-management include/linux/ioport.h
--- a/include/linux/ioport.h~pci-clean-up-resource-alignment-management
+++ a/include/linux/ioport.h
@@ -44,7 +44,9 @@ struct resource_list {
#define IORESOURCE_CACHEABLE 0x00004000
#define IORESOURCE_RANGELENGTH 0x00008000
#define IORESOURCE_SHADOWABLE 0x00010000
-#define IORESOURCE_BUS_HAS_VGA 0x00080000
+
+#define IORESOURCE_SIZEALIGN 0x00020000 /* size indicates alignment */
+#define IORESOURCE_STARTALIGN 0x00040000 /* start field is alignment */
#define IORESOURCE_DISABLED 0x10000000
#define IORESOURCE_UNSET 0x20000000
@@ -110,6 +112,7 @@ extern int allocate_resource(struct reso
void *alignf_data);
int adjust_resource(struct resource *res, resource_size_t start,
resource_size_t size);
+resource_size_t resource_alignment(struct resource *res);
/* Convenience shorthand with allocation */
#define request_region(start,n,name) __request_region(&ioport_resource, (start), (n), (name))
diff -puN kernel/resource.c~pci-clean-up-resource-alignment-management kernel/resource.c
--- a/kernel/resource.c~pci-clean-up-resource-alignment-management
+++ a/kernel/resource.c
@@ -486,6 +486,24 @@ int adjust_resource(struct resource *res
EXPORT_SYMBOL(adjust_resource);
+/**
+ * resource_alignment - calculate resource's alignment
+ * @res: resource pointer
+ *
+ * Returns alignment on success, 0 (invalid alignment) on failure.
+ */
+resource_size_t resource_alignment(struct resource *res)
+{
+ switch (res->flags & (IORESOURCE_SIZEALIGN | IORESOURCE_STARTALIGN)) {
+ case IORESOURCE_SIZEALIGN:
+ return res->end - res->start + 1;
+ case IORESOURCE_STARTALIGN:
+ return res->start;
+ default:
+ return 0;
+ }
+}
+
/*
* This is compatibility stuff for IO resources.
*
_
Patches currently in -mm which might be from ink@xxxxxxxxxxxxxxxxxxxx are
alpha-fix-alsa-dma-mmap-crash.patch
alpha-get_current-dont-add-zero-to-current_thread_info-task.patch
pci-clean-up-resource-alignment-management.patch
alpha-handle-kcalloc-failure.patch
alpha-remove-remaining-__function__-occurences.patch
alpha-replace-__inline-with-inline.patch
arch-alpha-kernel-trapsc-use-time_-macros.patch
arch-alpha-kernel-trapsc-use-time_-macros-fix.patch
alpha-teach-the-compiler-that-bug-doesnt-return.patch
introduce-a-generic-__fls-implementation.patch
implement-__fls-on-all-64-bit-archs.patch
use-__fls-for-fls64-on-64-bit-archs.patch
make-sure-nobodys-leaking-resources.patch
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