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>
This commit is contained in:
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7e7ab36775
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25235f712b
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@ -5,6 +5,7 @@
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#include <linux/irq.h>
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#include <linux/sysdev.h>
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#include <asm/dcr.h>
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#include <asm/msi_bitmap.h>
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/*
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* Global registers
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@ -301,8 +302,7 @@ struct mpic
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#endif
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#ifdef CONFIG_PCI_MSI
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spinlock_t bitmap_lock;
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unsigned long *hwirq_bitmap;
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struct msi_bitmap msi_bitmap;
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#endif
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#ifdef CONFIG_MPIC_BROKEN_REGREAD
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@ -14,8 +14,6 @@
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#ifdef CONFIG_PCI_MSI
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extern void mpic_msi_reserve_hwirq(struct mpic *mpic, irq_hw_number_t hwirq);
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extern int mpic_msi_init_allocator(struct mpic *mpic);
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extern irq_hw_number_t mpic_msi_alloc_hwirqs(struct mpic *mpic, int num);
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extern void mpic_msi_free_hwirqs(struct mpic *mpic, int offset, int num);
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extern int mpic_u3msi_init(struct mpic *mpic);
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extern int mpic_pasemi_msi_init(struct mpic *mpic);
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#else
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@ -15,59 +15,17 @@
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#include <asm/prom.h>
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#include <asm/hw_irq.h>
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#include <asm/ppc-pci.h>
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#include <asm/msi_bitmap.h>
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#include <sysdev/mpic.h>
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static void __mpic_msi_reserve_hwirq(struct mpic *mpic, irq_hw_number_t hwirq)
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{
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pr_debug("mpic: reserving hwirq 0x%lx\n", hwirq);
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bitmap_allocate_region(mpic->hwirq_bitmap, hwirq, 0);
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}
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void mpic_msi_reserve_hwirq(struct mpic *mpic, irq_hw_number_t hwirq)
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{
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unsigned long flags;
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/* The mpic calls this even when there is no allocator setup */
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if (!mpic->hwirq_bitmap)
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if (!mpic->msi_bitmap.bitmap)
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return;
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spin_lock_irqsave(&mpic->bitmap_lock, flags);
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__mpic_msi_reserve_hwirq(mpic, hwirq);
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spin_unlock_irqrestore(&mpic->bitmap_lock, flags);
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}
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irq_hw_number_t mpic_msi_alloc_hwirqs(struct mpic *mpic, int num)
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{
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unsigned long flags;
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int offset, order = get_count_order(num);
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spin_lock_irqsave(&mpic->bitmap_lock, flags);
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/*
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* This is fast, but stricter than we need. We might want to add
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* a fallback routine which does a linear search with no alignment.
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*/
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offset = bitmap_find_free_region(mpic->hwirq_bitmap, mpic->irq_count,
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order);
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spin_unlock_irqrestore(&mpic->bitmap_lock, flags);
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pr_debug("mpic: allocated 0x%x (2^%d) at offset 0x%x\n",
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num, order, offset);
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return offset;
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}
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void mpic_msi_free_hwirqs(struct mpic *mpic, int offset, int num)
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{
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unsigned long flags;
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int order = get_count_order(num);
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pr_debug("mpic: freeing 0x%x (2^%d) at offset 0x%x\n",
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num, order, offset);
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spin_lock_irqsave(&mpic->bitmap_lock, flags);
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bitmap_release_region(mpic->hwirq_bitmap, offset, order);
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spin_unlock_irqrestore(&mpic->bitmap_lock, flags);
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msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, hwirq);
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}
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#ifdef CONFIG_MPIC_U3_HT_IRQS
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@ -83,13 +41,13 @@ static int mpic_msi_reserve_u3_hwirqs(struct mpic *mpic)
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/* Reserve source numbers we know are reserved in the HW */
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for (i = 0; i < 8; i++)
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__mpic_msi_reserve_hwirq(mpic, i);
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msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i);
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for (i = 42; i < 46; i++)
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__mpic_msi_reserve_hwirq(mpic, i);
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msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i);
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for (i = 100; i < 105; i++)
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__mpic_msi_reserve_hwirq(mpic, i);
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msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i);
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np = NULL;
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while ((np = of_find_all_nodes(np))) {
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@ -99,7 +57,7 @@ static int mpic_msi_reserve_u3_hwirqs(struct mpic *mpic)
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while (of_irq_map_one(np, index++, &oirq) == 0) {
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ops->xlate(mpic->irqhost, NULL, oirq.specifier,
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oirq.size, &hwirq, &flags);
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__mpic_msi_reserve_hwirq(mpic, hwirq);
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msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, hwirq);
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}
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}
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@ -112,70 +70,25 @@ static int mpic_msi_reserve_u3_hwirqs(struct mpic *mpic)
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}
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#endif
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static int mpic_msi_reserve_dt_hwirqs(struct mpic *mpic)
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{
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int i, len;
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const u32 *p;
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p = of_get_property(mpic->irqhost->of_node,
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"msi-available-ranges", &len);
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if (!p) {
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pr_debug("mpic: no msi-available-ranges property found on %s\n",
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mpic->irqhost->of_node->full_name);
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return -ENODEV;
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}
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if (len % 8 != 0) {
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printk(KERN_WARNING "mpic: Malformed msi-available-ranges "
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"property on %s\n", mpic->irqhost->of_node->full_name);
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return -EINVAL;
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}
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bitmap_allocate_region(mpic->hwirq_bitmap, 0,
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get_count_order(mpic->irq_count));
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/* Format is: (<u32 start> <u32 count>)+ */
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len /= sizeof(u32);
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for (i = 0; i < len / 2; i++, p += 2)
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mpic_msi_free_hwirqs(mpic, *p, *(p + 1));
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return 0;
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}
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int mpic_msi_init_allocator(struct mpic *mpic)
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{
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int rc, size;
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int rc;
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BUG_ON(mpic->hwirq_bitmap);
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spin_lock_init(&mpic->bitmap_lock);
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rc = msi_bitmap_alloc(&mpic->msi_bitmap, mpic->irq_count,
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mpic->irqhost->of_node);
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if (rc)
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return rc;
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size = BITS_TO_LONGS(mpic->irq_count) * sizeof(long);
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pr_debug("mpic: allocator bitmap size is 0x%x bytes\n", size);
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mpic->hwirq_bitmap = alloc_maybe_bootmem(size, GFP_KERNEL);
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if (!mpic->hwirq_bitmap) {
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pr_debug("mpic: ENOMEM allocating allocator bitmap!\n");
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return -ENOMEM;
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}
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memset(mpic->hwirq_bitmap, 0, size);
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rc = mpic_msi_reserve_dt_hwirqs(mpic);
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if (rc) {
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rc = msi_bitmap_reserve_dt_hwirqs(&mpic->msi_bitmap);
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if (rc > 0) {
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if (mpic->flags & MPIC_U3_HT_IRQS)
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rc = mpic_msi_reserve_u3_hwirqs(mpic);
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if (rc)
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goto out_free;
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if (rc) {
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msi_bitmap_free(&mpic->msi_bitmap);
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return rc;
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}
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}
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return 0;
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out_free:
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if (mem_init_done)
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kfree(mpic->hwirq_bitmap);
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mpic->hwirq_bitmap = NULL;
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return rc;
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}
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@ -22,6 +22,7 @@
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#include <asm/prom.h>
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#include <asm/hw_irq.h>
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#include <asm/ppc-pci.h>
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#include <asm/msi_bitmap.h>
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#include "mpic.h"
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@ -81,8 +82,8 @@ static void pasemi_msi_teardown_msi_irqs(struct pci_dev *pdev)
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continue;
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set_irq_msi(entry->irq, NULL);
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mpic_msi_free_hwirqs(msi_mpic, virq_to_hw(entry->irq),
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ALLOC_CHUNK);
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msi_bitmap_free_hwirqs(&msi_mpic->msi_bitmap,
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virq_to_hw(entry->irq), ALLOC_CHUNK);
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irq_dispose_mapping(entry->irq);
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}
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static int pasemi_msi_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
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{
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irq_hw_number_t hwirq;
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unsigned int virq;
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struct msi_desc *entry;
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struct msi_msg msg;
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int ret;
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int hwirq;
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pr_debug("pasemi_msi_setup_msi_irqs, pdev %p nvec %d type %d\n",
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pdev, nvec, type);
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* few MSIs for someone, but restrictions will apply to how the
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* sources can be changed independently.
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*/
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ret = mpic_msi_alloc_hwirqs(msi_mpic, ALLOC_CHUNK);
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hwirq = ret;
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if (ret < 0) {
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hwirq = msi_bitmap_alloc_hwirqs(&msi_mpic->msi_bitmap,
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ALLOC_CHUNK);
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if (hwirq < 0) {
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pr_debug("pasemi_msi: failed allocating hwirq\n");
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return hwirq;
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}
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virq = irq_create_mapping(msi_mpic->irqhost, hwirq);
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if (virq == NO_IRQ) {
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pr_debug("pasemi_msi: failed mapping hwirq 0x%lx\n", hwirq);
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mpic_msi_free_hwirqs(msi_mpic, hwirq, ALLOC_CHUNK);
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pr_debug("pasemi_msi: failed mapping hwirq 0x%x\n",
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hwirq);
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msi_bitmap_free_hwirqs(&msi_mpic->msi_bitmap, hwirq,
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ALLOC_CHUNK);
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return -ENOSPC;
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}
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set_irq_chip(virq, &mpic_pasemi_msi_chip);
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set_irq_type(virq, IRQ_TYPE_EDGE_RISING);
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pr_debug("pasemi_msi: allocated virq 0x%x (hw 0x%lx) addr 0x%x\n",
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virq, hwirq, msg.address_lo);
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pr_debug("pasemi_msi: allocated virq 0x%x (hw 0x%x) " \
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"addr 0x%x\n", virq, hwirq, msg.address_lo);
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/* Likewise, the device writes [0...511] into the target
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* register to generate MSI [512...1023]
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@ -16,6 +16,7 @@
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#include <asm/prom.h>
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#include <asm/hw_irq.h>
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#include <asm/ppc-pci.h>
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#include <asm/msi_bitmap.h>
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#include "mpic.h"
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continue;
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set_irq_msi(entry->irq, NULL);
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mpic_msi_free_hwirqs(msi_mpic, virq_to_hw(entry->irq), 1);
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msi_bitmap_free_hwirqs(&msi_mpic->msi_bitmap,
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virq_to_hw(entry->irq), 1);
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irq_dispose_mapping(entry->irq);
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}
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static int u3msi_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
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{
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irq_hw_number_t hwirq;
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unsigned int virq;
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struct msi_desc *entry;
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struct msi_msg msg;
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u64 addr;
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int ret;
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int hwirq;
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addr = find_ht_magic_addr(pdev);
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msg.address_lo = addr & 0xFFFFFFFF;
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msg.address_hi = addr >> 32;
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list_for_each_entry(entry, &pdev->msi_list, list) {
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ret = mpic_msi_alloc_hwirqs(msi_mpic, 1);
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if (ret < 0) {
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hwirq = msi_bitmap_alloc_hwirqs(&msi_mpic->msi_bitmap, 1);
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if (hwirq < 0) {
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pr_debug("u3msi: failed allocating hwirq\n");
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return ret;
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return hwirq;
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}
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hwirq = ret;
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virq = irq_create_mapping(msi_mpic->irqhost, hwirq);
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if (virq == NO_IRQ) {
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pr_debug("u3msi: failed mapping hwirq 0x%lx\n", hwirq);
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mpic_msi_free_hwirqs(msi_mpic, hwirq, 1);
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pr_debug("u3msi: failed mapping hwirq 0x%x\n", hwirq);
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msi_bitmap_free_hwirqs(&msi_mpic->msi_bitmap, hwirq, 1);
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return -ENOSPC;
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}
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set_irq_chip(virq, &mpic_u3msi_chip);
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set_irq_type(virq, IRQ_TYPE_EDGE_RISING);
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pr_debug("u3msi: allocated virq 0x%x (hw 0x%lx) addr 0x%lx\n",
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virq, hwirq, addr);
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pr_debug("u3msi: allocated virq 0x%x (hw 0x%x) addr 0x%lx\n",
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virq, hwirq, (unsigned long)addr);
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msg.data = hwirq;
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write_msi_msg(virq, &msg);
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