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/* pci_msi.c: Sparc64 MSI support common layer.
*
* Copyright (C) 2007 David S. Miller (davem@davemloft.net)
*/
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/irq.h>
#include "pci_impl.h"
static irqreturn_t sparc64_msiq_interrupt(int irq, void *cookie)
{
struct sparc64_msiq_cookie *msiq_cookie = cookie;
struct pci_pbm_info *pbm = msiq_cookie->pbm;
unsigned long msiqid = msiq_cookie->msiqid;
const struct sparc64_msiq_ops *ops;
unsigned long orig_head, head;
int err;
ops = pbm->msi_ops;
err = ops->get_head(pbm, msiqid, &head);
if (unlikely(err < 0))
goto err_get_head;
orig_head = head;
for (;;) {
unsigned long msi;
err = ops->dequeue_msi(pbm, msiqid, &head, &msi);
if (likely(err > 0)) {
struct irq_desc *desc;
unsigned int irq;
irq = pbm->msi_irq_table[msi - pbm->msi_first];
desc = irq_desc + irq;
desc->handle_irq(irq, desc);
}
if (unlikely(err < 0))
goto err_dequeue;
if (err == 0)
break;
}
if (likely(head != orig_head)) {
err = ops->set_head(pbm, msiqid, head);
if (unlikely(err < 0))
goto err_set_head;
}
return IRQ_HANDLED;
err_get_head:
printk(KERN_EMERG "MSI: Get head on msiqid[%lu] gives error %d\n",
msiqid, err);
goto err_out;
err_dequeue:
printk(KERN_EMERG "MSI: Dequeue head[%lu] from msiqid[%lu] "
"gives error %d\n",
head, msiqid, err);
goto err_out;
err_set_head:
printk(KERN_EMERG "MSI: Set head[%lu] on msiqid[%lu] "
"gives error %d\n",
head, msiqid, err);
goto err_out;
err_out:
return IRQ_NONE;
}
static u32 pick_msiq(struct pci_pbm_info *pbm)
{
static DEFINE_SPINLOCK(rotor_lock);
unsigned long flags;
u32 ret, rotor;
spin_lock_irqsave(&rotor_lock, flags);
rotor = pbm->msiq_rotor;
ret = pbm->msiq_first + rotor;
if (++rotor >= pbm->msiq_num)
rotor = 0;
pbm->msiq_rotor = rotor;
spin_unlock_irqrestore(&rotor_lock, flags);
return ret;
}
static int alloc_msi(struct pci_pbm_info *pbm)
{
int i;
for (i = 0; i < pbm->msi_num; i++) {
if (!test_and_set_bit(i, pbm->msi_bitmap))
return i + pbm->msi_first;
}
return -ENOENT;
}
static void free_msi(struct pci_pbm_info *pbm, int msi_num)
{
msi_num -= pbm->msi_first;
clear_bit(msi_num, pbm->msi_bitmap);
}
static struct irq_chip msi_irq = {
.name = "PCI-MSI",
.irq_mask = mask_msi_irq,
.irq_unmask = unmask_msi_irq,
.irq_enable = unmask_msi_irq,
.irq_disable = mask_msi_irq,
/* XXX affinity XXX */
};
static int sparc64_setup_msi_irq(unsigned int *irq_p,
struct pci_dev *pdev,
struct msi_desc *entry)
{
struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
const struct sparc64_msiq_ops *ops = pbm->msi_ops;
struct msi_msg msg;
int msi, err;
u32 msiqid;
*irq_p = irq_alloc(0, 0);
err = -ENOMEM;
if (!*irq_p)
goto out_err;
set_irq_chip_and_handler_name(*irq_p, &msi_irq,
handle_simple_irq, "MSI");
err = alloc_msi(pbm);
if (unlikely(err < 0))
goto out_irq_free;
msi = err;
msiqid = pick_msiq(pbm);
err = ops->msi_setup(pbm, msiqid, msi,
(entry->msi_attrib.is_64 ? 1 : 0));
if (err)
goto out_msi_free;
pbm->msi_irq_table[msi - pbm->msi_first] = *irq_p;
if (entry->msi_attrib.is_64) {
msg.address_hi = pbm->msi64_start >> 32;
msg.address_lo = pbm->msi64_start & 0xffffffff;
} else {
msg.address_hi = 0;
msg.address_lo = pbm->msi32_start;
}
msg.data = msi;
set_irq_msi(*irq_p, entry);
write_msi_msg(*irq_p, &msg);
return 0;
out_msi_free:
free_msi(pbm, msi);
out_irq_free:
set_irq_chip(*irq_p, NULL);
irq_free(*irq_p);
*irq_p = 0;
out_err:
return err;
}
static void sparc64_teardown_msi_irq(unsigned int irq,
struct pci_dev *pdev)
{
struct pci_pbm_info *pbm = pdev->dev.archdata.host_controller;
const struct sparc64_msiq_ops *ops = pbm->msi_ops;
unsigned int msi_num;
int i, err;
for (i = 0; i < pbm->msi_num; i++) {
if (pbm->msi_irq_table[i] == irq)
break;
}
if (i >= pbm->msi_num) {
printk(KERN_ERR "%s: teardown: No MSI for irq %u\n",
pbm->name, irq);
return;
}
msi_num = pbm->msi_first + i;
pbm->msi_irq_table[i] = ~0U;
err = ops->msi_teardown(pbm, msi_num);
if (err) {
printk(KERN_ERR "%s: teardown: ops->teardown() on MSI %u, "
"irq %u, gives error %d\n",
pbm->name, msi_num, irq, err);
return;
}
free_msi(pbm, msi_num);
set_irq_chip(irq, NULL);
irq_free(irq);
}
static int msi_bitmap_alloc(struct pci_pbm_info *pbm)
{
unsigned long size, bits_per_ulong;
bits_per_ulong = sizeof(unsigned long) * 8;
size = (pbm->msi_num + (bits_per_ulong - 1)) & ~(bits_per_ulong - 1);
size /= 8;
BUG_ON(size % sizeof(unsigned long));
pbm->msi_bitmap = kzalloc(size, GFP_KERNEL);
if (!pbm->msi_bitmap)
return -ENOMEM;
return 0;
}
static void msi_bitmap_free(struct pci_pbm_info *pbm)
{
kfree(pbm->msi_bitmap);
pbm->msi_bitmap = NULL;
}
static int msi_table_alloc(struct pci_pbm_info *pbm)
{
int size, i;
size = pbm->msiq_num * sizeof(struct sparc64_msiq_cookie);
pbm->msiq_irq_cookies = kzalloc(size, GFP_KERNEL);
if (!pbm->msiq_irq_cookies)
return -ENOMEM;
for
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