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// SPDX-License-Identifier: GPL-2.0
#define KMSG_COMPONENT "zpci"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/kernel.h>
#include <linux/irq.h>
#include <linux/kernel_stat.h>
#include <linux/pci.h>
#include <linux/msi.h>
#include <asm/isc.h>
#include <asm/airq.h>
#define SIC_IRQ_MODE_ALL 0
#define SIC_IRQ_MODE_SINGLE 1
static struct airq_iv *zpci_aisb_iv;
static struct airq_iv *zpci_aibv[ZPCI_NR_DEVICES];
/* Modify PCI: Register adapter interruptions */
static int zpci_set_airq(struct zpci_dev *zdev)
{
u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_REG_INT);
struct zpci_fib fib = {0};
u8 status;
fib.isc = PCI_ISC;
fib.sum = 1; /* enable summary notifications */
fib.noi = airq_iv_end(zdev->aibv);
fib.aibv = (unsigned long) zdev->aibv->vector;
fib.aibvo = 0; /* each zdev has its own interrupt vector */
fib.aisb = (unsigned long) zpci_aisb_iv->vector + (zdev->aisb/64)*8;
fib.aisbo = zdev->aisb & 63;
return zpci_mod_fc(req, &fib, &status) ? -EIO : 0;
}
/* Modify PCI: Unregister adapter interruptions */
static int zpci_clear_airq(struct zpci_dev *zdev)
{
u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_DEREG_INT);
struct zpci_fib fib = {0};
u8 cc, status;
cc = zpci_mod_fc(req, &fib, &status);
if (cc == 3 || (cc == 1 && status == 24))
/* Function already gone or IRQs already deregistered. */
cc = 0;
return cc ? -EIO : 0;
}
static struct irq_chip zpci_irq_chip = {
.name = "zPCI",
.irq_unmask = pci_msi_unmask_irq,
.irq_mask = pci_msi_mask_irq,
};
static void zpci_irq_handler(struct airq_struct *airq, bool floating)
{
unsigned long si, ai;
struct airq_iv *aibv;
int irqs_on = 0;
inc_irq_stat(IRQIO_PCI);
for (si = 0;;) {
/* Scan adapter summary indicator bit vector */
si = airq_iv_scan(zpci_aisb_iv, si, airq_iv_end(zpci_aisb_iv));
if (si == -1UL) {
if (irqs_on++)
/* End of second scan with interrupts on. */
break;
/* First scan complete, reenable interrupts. */
if (zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC))
break;
si = 0;
continue;
}
/* Scan the adapter interrupt vector for this device. */
aibv = zpci_aibv[si];
for (ai = 0;;) {
ai = airq_iv_scan(aibv, ai, airq_iv_end(aibv));
if (ai == -1UL)
break;
inc_irq_stat(IRQIO_MSI);
airq_iv_lock(aibv, ai);
generic_handle_irq(airq_iv_get_data(aibv, ai));
airq_iv_unlock(aibv, ai);
}
}
}
int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
{
struct zpci_dev *zdev = to_zpci(pdev);
unsigned int hwirq, msi_vecs;
unsigned long aisb;
struct msi_desc *msi;
struct msi_msg msg;
int rc, irq;
zdev->aisb = -1UL;
if (type == PCI_CAP_ID_MSI && nvec > 1)
return 1;
msi_vecs = min_t(unsigned int, nvec, zdev->max_msi);
/* Allocate adapter summary indicator bit */
aisb = airq_iv_alloc_bit(zpci_aisb_iv);
if (aisb == -1UL)
return -EIO;
zdev->aisb = aisb;
/* Create adapter interrupt vector */
zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA | AIRQ_IV_BITLOCK);
if (!zdev->aibv)
return -ENOMEM;
/* Wire up shortcut pointer */
zpci_aibv[aisb] = zdev->aibv;
/* Request MSI interrupts */
hwirq = 0;
for_each_pci_msi_entry(msi, pdev) {
if (hwirq >= msi_vecs)
break;
irq = irq_alloc_desc(0); /* Alloc irq on node 0 */
if (irq < 0)
return -ENOMEM;
rc = irq_set_msi_desc(irq, msi);
if (rc)
return rc;
irq_set_chip_and_handler(irq, &zpci_irq_chip,
handle_simple_irq);
msg.data = hwirq;
msg.address_lo = zdev->msi_addr & 0xffffffff;
msg.address_hi = zdev->msi_addr >> 32;
pci_write_msi_msg(irq, &msg);
airq_iv_set_data(zdev->aibv, hwirq, irq);
hwirq++;
}
/* Enable adapter interrupts */
rc = zpci_set_airq(zdev);
if (rc)
return rc;
return (msi_vecs == nvec) ? 0 : msi_vecs;
}
void arch_teardown_msi_irqs(struct pci_dev *pdev)
{
struct zpci_dev *zdev = to_zpci(pdev);
struct msi_desc *msi;
int rc;
/* Disable adapter interrupts */
rc = zpci_clear_airq(zdev);
if (rc)
return;
/* Release MSI interrupts */
for_each_pci_msi_entry(msi, pdev) {
if (!msi->irq)
continue;
if (msi->msi_attrib.is_msix)
__pci_msix_desc_mask_irq(msi, 1);
else
__pci_msi_desc_mask_irq(msi, 1, 1);
irq_set_msi_desc(msi->irq, NULL);
irq_free_desc(msi->irq);
msi->msg.address_lo = 0;
msi->msg.address_hi = 0;
msi->msg.data = 0;
msi->irq = 0;
}
if (zdev->aisb != -1UL) {
zpci_aibv[zdev->aisb] = NULL;
airq_iv_free_bit(zpci_aisb_iv, zdev->aisb);
zdev->aisb = -1UL;
}
if (zdev->aibv) {
airq_iv_release(zdev->aibv);
zdev->aibv = NULL;
}
}
static struct airq_struct zpci_airq = {
.handler = zpci_irq_handler,
.isc = PCI_ISC,
};
int __init zpci_irq_init(void)
{
int rc;
rc = register_adapter_interrupt(&zpci_airq);
if (rc)
goto out;
/* Set summary to 1 to be called every time for the ISC. */
*zpci_airq.lsi_ptr = 1;
rc = -ENOMEM;
zpci_aisb_iv = airq_iv_create(ZPCI_NR_DEVICES, AIRQ_IV_ALLOC);
if (!zpci_aisb_iv)
goto out_airq;
zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
return 0;
out_airq:
unregister_adapter_interrupt(&zpci_airq);
out:
return rc;
}
void __init zpci_irq_exit(void)
{
airq_iv_release(zpci_aisb_iv);
unregister_adapter_interrupt(&zpci_airq);
}
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