powerpc: Convert the MPIC MSI code to use msi_bitmap
This affects the U3 MSI code as well as the PASEMI MSI code. We keep
some of the MPIC routines as helpers, and also the U3 best-guess
reservation logic. The rest is replaced by the generic code.
And a few printk format changes due to hwirq type change.
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/sysdev/mpic_msi.c b/arch/powerpc/sysdev/mpic_msi.c
index de3e5e8..1d44eee 100644
--- a/arch/powerpc/sysdev/mpic_msi.c
+++ b/arch/powerpc/sysdev/mpic_msi.c
@@ -15,59 +15,17 @@
#include <asm/prom.h>
#include <asm/hw_irq.h>
#include <asm/ppc-pci.h>
+#include <asm/msi_bitmap.h>
#include <sysdev/mpic.h>
-static void __mpic_msi_reserve_hwirq(struct mpic *mpic, irq_hw_number_t hwirq)
-{
- pr_debug("mpic: reserving hwirq 0x%lx\n", hwirq);
- bitmap_allocate_region(mpic->hwirq_bitmap, hwirq, 0);
-}
-
void mpic_msi_reserve_hwirq(struct mpic *mpic, irq_hw_number_t hwirq)
{
- unsigned long flags;
-
/* The mpic calls this even when there is no allocator setup */
- if (!mpic->hwirq_bitmap)
+ if (!mpic->msi_bitmap.bitmap)
return;
- spin_lock_irqsave(&mpic->bitmap_lock, flags);
- __mpic_msi_reserve_hwirq(mpic, hwirq);
- spin_unlock_irqrestore(&mpic->bitmap_lock, flags);
-}
-
-irq_hw_number_t mpic_msi_alloc_hwirqs(struct mpic *mpic, int num)
-{
- unsigned long flags;
- int offset, order = get_count_order(num);
-
- spin_lock_irqsave(&mpic->bitmap_lock, flags);
- /*
- * This is fast, but stricter than we need. We might want to add
- * a fallback routine which does a linear search with no alignment.
- */
- offset = bitmap_find_free_region(mpic->hwirq_bitmap, mpic->irq_count,
- order);
- spin_unlock_irqrestore(&mpic->bitmap_lock, flags);
-
- pr_debug("mpic: allocated 0x%x (2^%d) at offset 0x%x\n",
- num, order, offset);
-
- return offset;
-}
-
-void mpic_msi_free_hwirqs(struct mpic *mpic, int offset, int num)
-{
- unsigned long flags;
- int order = get_count_order(num);
-
- pr_debug("mpic: freeing 0x%x (2^%d) at offset 0x%x\n",
- num, order, offset);
-
- spin_lock_irqsave(&mpic->bitmap_lock, flags);
- bitmap_release_region(mpic->hwirq_bitmap, offset, order);
- spin_unlock_irqrestore(&mpic->bitmap_lock, flags);
+ msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, hwirq);
}
#ifdef CONFIG_MPIC_U3_HT_IRQS
@@ -83,13 +41,13 @@
/* Reserve source numbers we know are reserved in the HW */
for (i = 0; i < 8; i++)
- __mpic_msi_reserve_hwirq(mpic, i);
+ msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i);
for (i = 42; i < 46; i++)
- __mpic_msi_reserve_hwirq(mpic, i);
+ msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i);
for (i = 100; i < 105; i++)
- __mpic_msi_reserve_hwirq(mpic, i);
+ msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i);
np = NULL;
while ((np = of_find_all_nodes(np))) {
@@ -99,7 +57,7 @@
while (of_irq_map_one(np, index++, &oirq) == 0) {
ops->xlate(mpic->irqhost, NULL, oirq.specifier,
oirq.size, &hwirq, &flags);
- __mpic_msi_reserve_hwirq(mpic, hwirq);
+ msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, hwirq);
}
}
@@ -112,70 +70,25 @@
}
#endif
-static int mpic_msi_reserve_dt_hwirqs(struct mpic *mpic)
-{
- int i, len;
- const u32 *p;
-
- p = of_get_property(mpic->irqhost->of_node,
- "msi-available-ranges", &len);
- if (!p) {
- pr_debug("mpic: no msi-available-ranges property found on %s\n",
- mpic->irqhost->of_node->full_name);
- return -ENODEV;
- }
-
- if (len % 8 != 0) {
- printk(KERN_WARNING "mpic: Malformed msi-available-ranges "
- "property on %s\n", mpic->irqhost->of_node->full_name);
- return -EINVAL;
- }
-
- bitmap_allocate_region(mpic->hwirq_bitmap, 0,
- get_count_order(mpic->irq_count));
-
- /* Format is: (<u32 start> <u32 count>)+ */
- len /= sizeof(u32);
- for (i = 0; i < len / 2; i++, p += 2)
- mpic_msi_free_hwirqs(mpic, *p, *(p + 1));
-
- return 0;
-}
-
int mpic_msi_init_allocator(struct mpic *mpic)
{
- int rc, size;
+ int rc;
- BUG_ON(mpic->hwirq_bitmap);
- spin_lock_init(&mpic->bitmap_lock);
+ rc = msi_bitmap_alloc(&mpic->msi_bitmap, mpic->irq_count,
+ mpic->irqhost->of_node);
+ if (rc)
+ return rc;
- size = BITS_TO_LONGS(mpic->irq_count) * sizeof(long);
- pr_debug("mpic: allocator bitmap size is 0x%x bytes\n", size);
-
- mpic->hwirq_bitmap = alloc_maybe_bootmem(size, GFP_KERNEL);
-
- if (!mpic->hwirq_bitmap) {
- pr_debug("mpic: ENOMEM allocating allocator bitmap!\n");
- return -ENOMEM;
- }
-
- memset(mpic->hwirq_bitmap, 0, size);
-
- rc = mpic_msi_reserve_dt_hwirqs(mpic);
- if (rc) {
+ rc = msi_bitmap_reserve_dt_hwirqs(&mpic->msi_bitmap);
+ if (rc > 0) {
if (mpic->flags & MPIC_U3_HT_IRQS)
rc = mpic_msi_reserve_u3_hwirqs(mpic);
- if (rc)
- goto out_free;
+ if (rc) {
+ msi_bitmap_free(&mpic->msi_bitmap);
+ return rc;
+ }
}
return 0;
-
- out_free:
- if (mem_init_done)
- kfree(mpic->hwirq_bitmap);
-
- mpic->hwirq_bitmap = NULL;
- return rc;
}