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path: root/drivers/parisc/lba_pci.c
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Diffstat (limited to 'drivers/parisc/lba_pci.c')
-rw-r--r--drivers/parisc/lba_pci.c113
1 files changed, 90 insertions, 23 deletions
diff --git a/drivers/parisc/lba_pci.c b/drivers/parisc/lba_pci.c
index 4f6bdf0881b5..cbae8c8963fa 100644
--- a/drivers/parisc/lba_pci.c
+++ b/drivers/parisc/lba_pci.c
@@ -695,11 +695,71 @@ lba_claim_dev_resources(struct pci_dev *dev)
}
}
}
+
+
+/*
+ * truncate_pat_collision: Deal with overlaps or outright collisions
+ * between PAT PDC reported ranges.
+ *
+ * Broken PA8800 firmware will report lmmio range that
+ * overlaps with CPU HPA. Just truncate the lmmio range.
+ *
+ * BEWARE: conflicts with this lmmio range may be an
+ * elmmio range which is pointing down another rope.
+ *
+ * FIXME: only deals with one collision per range...theoretically we
+ * could have several. Supporting more than one collision will get messy.
+ */
+static unsigned long
+truncate_pat_collision(struct resource *root, struct resource *new)
+{
+ unsigned long start = new->start;
+ unsigned long end = new->end;
+ struct resource *tmp = root->child;
+
+ if (end <= start || start < root->start || !tmp)
+ return 0;
+
+ /* find first overlap */
+ while (tmp && tmp->end < start)
+ tmp = tmp->sibling;
+
+ /* no entries overlap */
+ if (!tmp) return 0;
+
+ /* found one that starts behind the new one
+ ** Don't need to do anything.
+ */
+ if (tmp->start >= end) return 0;
+
+ if (tmp->start <= start) {
+ /* "front" of new one overlaps */
+ new->start = tmp->end + 1;
+
+ if (tmp->end >= end) {
+ /* AACCKK! totally overlaps! drop this range. */
+ return 1;
+ }
+ }
+
+ if (tmp->end < end ) {
+ /* "end" of new one overlaps */
+ new->end = tmp->start - 1;
+ }
+
+ printk(KERN_WARNING "LBA: Truncating lmmio_space [%lx/%lx] "
+ "to [%lx,%lx]\n",
+ start, end,
+ new->start, new->end );
+
+ return 0; /* truncation successful */
+}
+
#else
-#define lba_claim_dev_resources(dev)
+#define lba_claim_dev_resources(dev) do { } while (0)
+#define truncate_pat_collision(r,n) (0)
#endif
-
/*
** The algorithm is generic code.
** But it needs to access local data structures to get the IRQ base.
@@ -747,6 +807,9 @@ lba_fixup_bus(struct pci_bus *bus)
lba_dump_res(&ioport_resource, 2);
BUG();
}
+ /* advertize Host bridge resources to PCI bus */
+ bus->resource[0] = &(ldev->hba.io_space);
+ i = 1;
if (ldev->hba.elmmio_space.start) {
err = request_resource(&iomem_resource,
@@ -760,23 +823,35 @@ lba_fixup_bus(struct pci_bus *bus)
/* lba_dump_res(&iomem_resource, 2); */
/* BUG(); */
- }
+ } else
+ bus->resource[i++] = &(ldev->hba.elmmio_space);
}
- err = request_resource(&iomem_resource, &(ldev->hba.lmmio_space));
- if (err < 0) {
- /* FIXME overlaps with elmmio will fail here.
- * Need to prune (or disable) the distributed range.
- *
- * BEWARE: conflicts with this lmmio range may be
- * elmmio range which is pointing down another rope.
- */
-
- printk("FAILED: lba_fixup_bus() request for "
+
+ /* Overlaps with elmmio can (and should) fail here.
+ * We will prune (or ignore) the distributed range.
+ *
+ * FIXME: SBA code should register all elmmio ranges first.
+ * that would take care of elmmio ranges routed
+ * to a different rope (already discovered) from
+ * getting registered *after* LBA code has already
+ * registered it's distributed lmmio range.
+ */
+ if (truncate_pat_collision(&iomem_resource,
+ &(ldev->hba.lmmio_space))) {
+
+ printk(KERN_WARNING "LBA: lmmio_space [%lx/%lx] duplicate!\n",
+ ldev->hba.lmmio_space.start,
+ ldev->hba.lmmio_space.end);
+ } else {
+ err = request_resource(&iomem_resource, &(ldev->hba.lmmio_space));
+ if (err < 0) {
+ printk(KERN_ERR "FAILED: lba_fixup_bus() request for "
"lmmio_space [%lx/%lx]\n",
ldev->hba.lmmio_space.start,
ldev->hba.lmmio_space.end);
- /* lba_dump_res(&iomem_resource, 2); */
+ } else
+ bus->resource[i++] = &(ldev->hba.lmmio_space);
}
#ifdef CONFIG_64BIT
@@ -791,18 +866,10 @@ lba_fixup_bus(struct pci_bus *bus)
lba_dump_res(&iomem_resource, 2);
BUG();
}
+ bus->resource[i++] = &(ldev->hba.gmmio_space);
}
#endif
- /* advertize Host bridge resources to PCI bus */
- bus->resource[0] = &(ldev->hba.io_space);
- bus->resource[1] = &(ldev->hba.lmmio_space);
- i=2;
- if (ldev->hba.elmmio_space.start)
- bus->resource[i++] = &(ldev->hba.elmmio_space);
- if (ldev->hba.gmmio_space.start)
- bus->resource[i++] = &(ldev->hba.gmmio_space);
-
}
list_for_each(ln, &bus->devices) {

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