mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 02:23:16 +00:00
256c1df36b
We used to need this to compute virt_irq --> ino, but that is no longer necessary. Signed-off-by: David S. Miller <davem@davemloft.net>
434 lines
9.4 KiB
C
434 lines
9.4 KiB
C
/* 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/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))
|
|
__do_IRQ(pbm->msi_irq_table[msi - pbm->msi_first]);
|
|
|
|
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 = {
|
|
.typename = "PCI-MSI",
|
|
.mask = mask_msi_irq,
|
|
.unmask = unmask_msi_irq,
|
|
.enable = unmask_msi_irq,
|
|
.disable = mask_msi_irq,
|
|
/* XXX affinity XXX */
|
|
};
|
|
|
|
int sparc64_setup_msi_irq(unsigned int *virt_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;
|
|
|
|
*virt_irq_p = virt_irq_alloc(0, 0);
|
|
err = -ENOMEM;
|
|
if (!*virt_irq_p)
|
|
goto out_err;
|
|
|
|
set_irq_chip(*virt_irq_p, &msi_irq);
|
|
|
|
err = alloc_msi(pbm);
|
|
if (unlikely(err < 0))
|
|
goto out_virt_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] = *virt_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(*virt_irq_p, entry);
|
|
write_msi_msg(*virt_irq_p, &msg);
|
|
|
|
return 0;
|
|
|
|
out_msi_free:
|
|
free_msi(pbm, msi);
|
|
|
|
out_virt_irq_free:
|
|
set_irq_chip(*virt_irq_p, NULL);
|
|
virt_irq_free(*virt_irq_p);
|
|
*virt_irq_p = 0;
|
|
|
|
out_err:
|
|
return err;
|
|
}
|
|
|
|
void sparc64_teardown_msi_irq(unsigned int virt_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] == virt_irq)
|
|
break;
|
|
}
|
|
if (i >= pbm->msi_num) {
|
|
printk(KERN_ERR "%s: teardown: No MSI for irq %u\n",
|
|
pbm->name, virt_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, virt_irq, err);
|
|
return;
|
|
}
|
|
|
|
free_msi(pbm, msi_num);
|
|
|
|
set_irq_chip(virt_irq, NULL);
|
|
virt_irq_free(virt_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 (i = 0; i < pbm->msiq_num; i++) {
|
|
struct sparc64_msiq_cookie *p;
|
|
|
|
p = &pbm->msiq_irq_cookies[i];
|
|
p->pbm = pbm;
|
|
p->msiqid = pbm->msiq_first + i;
|
|
}
|
|
|
|
size = pbm->msi_num * sizeof(unsigned int);
|
|
pbm->msi_irq_table = kzalloc(size, GFP_KERNEL);
|
|
if (!pbm->msi_irq_table) {
|
|
kfree(pbm->msiq_irq_cookies);
|
|
pbm->msiq_irq_cookies = NULL;
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void msi_table_free(struct pci_pbm_info *pbm)
|
|
{
|
|
kfree(pbm->msiq_irq_cookies);
|
|
pbm->msiq_irq_cookies = NULL;
|
|
|
|
kfree(pbm->msi_irq_table);
|
|
pbm->msi_irq_table = NULL;
|
|
}
|
|
|
|
static int bringup_one_msi_queue(struct pci_pbm_info *pbm,
|
|
const struct sparc64_msiq_ops *ops,
|
|
unsigned long msiqid,
|
|
unsigned long devino)
|
|
{
|
|
int irq = ops->msiq_build_irq(pbm, msiqid, devino);
|
|
int err;
|
|
|
|
if (irq < 0)
|
|
return irq;
|
|
|
|
err = request_irq(irq, sparc64_msiq_interrupt, 0,
|
|
"MSIQ",
|
|
&pbm->msiq_irq_cookies[msiqid - pbm->msiq_first]);
|
|
if (err)
|
|
return err;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sparc64_bringup_msi_queues(struct pci_pbm_info *pbm,
|
|
const struct sparc64_msiq_ops *ops)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < pbm->msiq_num; i++) {
|
|
unsigned long msiqid = i + pbm->msiq_first;
|
|
unsigned long devino = i + pbm->msiq_first_devino;
|
|
int err;
|
|
|
|
err = bringup_one_msi_queue(pbm, ops, msiqid, devino);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void sparc64_pbm_msi_init(struct pci_pbm_info *pbm,
|
|
const struct sparc64_msiq_ops *ops)
|
|
{
|
|
const u32 *val;
|
|
int len;
|
|
|
|
val = of_get_property(pbm->prom_node, "#msi-eqs", &len);
|
|
if (!val || len != 4)
|
|
goto no_msi;
|
|
pbm->msiq_num = *val;
|
|
if (pbm->msiq_num) {
|
|
const struct msiq_prop {
|
|
u32 first_msiq;
|
|
u32 num_msiq;
|
|
u32 first_devino;
|
|
} *mqp;
|
|
const struct msi_range_prop {
|
|
u32 first_msi;
|
|
u32 num_msi;
|
|
} *mrng;
|
|
const struct addr_range_prop {
|
|
u32 msi32_high;
|
|
u32 msi32_low;
|
|
u32 msi32_len;
|
|
u32 msi64_high;
|
|
u32 msi64_low;
|
|
u32 msi64_len;
|
|
} *arng;
|
|
|
|
val = of_get_property(pbm->prom_node, "msi-eq-size", &len);
|
|
if (!val || len != 4)
|
|
goto no_msi;
|
|
|
|
pbm->msiq_ent_count = *val;
|
|
|
|
mqp = of_get_property(pbm->prom_node,
|
|
"msi-eq-to-devino", &len);
|
|
if (!mqp)
|
|
mqp = of_get_property(pbm->prom_node,
|
|
"msi-eq-devino", &len);
|
|
if (!mqp || len != sizeof(struct msiq_prop))
|
|
goto no_msi;
|
|
|
|
pbm->msiq_first = mqp->first_msiq;
|
|
pbm->msiq_first_devino = mqp->first_devino;
|
|
|
|
val = of_get_property(pbm->prom_node, "#msi", &len);
|
|
if (!val || len != 4)
|
|
goto no_msi;
|
|
pbm->msi_num = *val;
|
|
|
|
mrng = of_get_property(pbm->prom_node, "msi-ranges", &len);
|
|
if (!mrng || len != sizeof(struct msi_range_prop))
|
|
goto no_msi;
|
|
pbm->msi_first = mrng->first_msi;
|
|
|
|
val = of_get_property(pbm->prom_node, "msi-data-mask", &len);
|
|
if (!val || len != 4)
|
|
goto no_msi;
|
|
pbm->msi_data_mask = *val;
|
|
|
|
val = of_get_property(pbm->prom_node, "msix-data-width", &len);
|
|
if (!val || len != 4)
|
|
goto no_msi;
|
|
pbm->msix_data_width = *val;
|
|
|
|
arng = of_get_property(pbm->prom_node, "msi-address-ranges",
|
|
&len);
|
|
if (!arng || len != sizeof(struct addr_range_prop))
|
|
goto no_msi;
|
|
pbm->msi32_start = ((u64)arng->msi32_high << 32) |
|
|
(u64) arng->msi32_low;
|
|
pbm->msi64_start = ((u64)arng->msi64_high << 32) |
|
|
(u64) arng->msi64_low;
|
|
pbm->msi32_len = arng->msi32_len;
|
|
pbm->msi64_len = arng->msi64_len;
|
|
|
|
if (msi_bitmap_alloc(pbm))
|
|
goto no_msi;
|
|
|
|
if (msi_table_alloc(pbm)) {
|
|
msi_bitmap_free(pbm);
|
|
goto no_msi;
|
|
}
|
|
|
|
if (ops->msiq_alloc(pbm)) {
|
|
msi_table_free(pbm);
|
|
msi_bitmap_free(pbm);
|
|
goto no_msi;
|
|
}
|
|
|
|
if (sparc64_bringup_msi_queues(pbm, ops)) {
|
|
ops->msiq_free(pbm);
|
|
msi_table_free(pbm);
|
|
msi_bitmap_free(pbm);
|
|
goto no_msi;
|
|
}
|
|
|
|
printk(KERN_INFO "%s: MSI Queue first[%u] num[%u] count[%u] "
|
|
"devino[0x%x]\n",
|
|
pbm->name,
|
|
pbm->msiq_first, pbm->msiq_num,
|
|
pbm->msiq_ent_count,
|
|
pbm->msiq_first_devino);
|
|
printk(KERN_INFO "%s: MSI first[%u] num[%u] mask[0x%x] "
|
|
"width[%u]\n",
|
|
pbm->name,
|
|
pbm->msi_first, pbm->msi_num, pbm->msi_data_mask,
|
|
pbm->msix_data_width);
|
|
printk(KERN_INFO "%s: MSI addr32[0x%lx:0x%x] "
|
|
"addr64[0x%lx:0x%x]\n",
|
|
pbm->name,
|
|
pbm->msi32_start, pbm->msi32_len,
|
|
pbm->msi64_start, pbm->msi64_len);
|
|
printk(KERN_INFO "%s: MSI queues at RA [%016lx]\n",
|
|
pbm->name,
|
|
__pa(pbm->msi_queues));
|
|
|
|
pbm->msi_ops = ops;
|
|
pbm->setup_msi_irq = sparc64_setup_msi_irq;
|
|
pbm->teardown_msi_irq = sparc64_teardown_msi_irq;
|
|
}
|
|
return;
|
|
|
|
no_msi:
|
|
pbm->msiq_num = 0;
|
|
printk(KERN_INFO "%s: No MSI support.\n", pbm->name);
|
|
}
|