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authorSebastian Ott <sebott@linux.ibm.com>2019-02-14 14:56:50 +0300
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2019-04-29 11:47:01 +0300
commitb1f548645cb587c14f5e751b9163939d0723885f (patch)
tree261ce64307f52f2612d6ddc222b41796ad7abf90 /arch/s390/pci
parent30e63ef2ef43f014bf2039bd57cc917780d6a44b (diff)
downloadlinux-b1f548645cb587c14f5e751b9163939d0723885f.tar.xz
s390/pci: clarify interrupt vector usage
Rename and clarify the usage of the interrupt bit vectors. Also change the array of the per-function bit vectors to be dynamically allocated. Signed-off-by: Sebastian Ott <sebott@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/pci')
-rw-r--r--arch/s390/pci/pci_irq.c38
1 files changed, 26 insertions, 12 deletions
diff --git a/arch/s390/pci/pci_irq.c b/arch/s390/pci/pci_irq.c
index 55e22e392376..0170db93be82 100644
--- a/arch/s390/pci/pci_irq.c
+++ b/arch/s390/pci/pci_irq.c
@@ -14,8 +14,15 @@
#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];
+/*
+ * summary bit vector - one summary bit per function
+ */
+static struct airq_iv *zpci_sbv;
+
+/*
+ * interrupt bit vectors - one vector per function
+ */
+static struct airq_iv **zpci_ibv;
/* Modify PCI: Register adapter interruptions */
static int zpci_set_airq(struct zpci_dev *zdev)
@@ -29,7 +36,7 @@ static int zpci_set_airq(struct zpci_dev *zdev)
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.aisb = (unsigned long) zpci_sbv->vector + (zdev->aisb/64)*8;
fib.aisbo = zdev->aisb & 63;
return zpci_mod_fc(req, &fib, &status) ? -EIO : 0;
@@ -65,7 +72,7 @@ static void zpci_irq_handler(struct airq_struct *airq, bool floating)
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));
+ si = airq_iv_scan(zpci_sbv, si, airq_iv_end(zpci_sbv));
if (si == -1UL) {
if (irqs_on++)
/* End of second scan with interrupts on. */
@@ -78,7 +85,7 @@ static void zpci_irq_handler(struct airq_struct *airq, bool floating)
}
/* Scan the adapter interrupt vector for this device. */
- aibv = zpci_aibv[si];
+ aibv = zpci_ibv[si];
for (ai = 0;;) {
ai = airq_iv_scan(aibv, ai, airq_iv_end(aibv));
if (ai == -1UL)
@@ -106,7 +113,7 @@ int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
msi_vecs = min_t(unsigned int, nvec, zdev->max_msi);
/* Allocate adapter summary indicator bit */
- aisb = airq_iv_alloc_bit(zpci_aisb_iv);
+ aisb = airq_iv_alloc_bit(zpci_sbv);
if (aisb == -1UL)
return -EIO;
zdev->aisb = aisb;
@@ -117,7 +124,7 @@ int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
return -ENOMEM;
/* Wire up shortcut pointer */
- zpci_aibv[aisb] = zdev->aibv;
+ zpci_ibv[aisb] = zdev->aibv;
/* Request MSI interrupts */
hwirq = 0;
@@ -176,8 +183,8 @@ void arch_teardown_msi_irqs(struct pci_dev *pdev)
}
if (zdev->aisb != -1UL) {
- zpci_aibv[zdev->aisb] = NULL;
- airq_iv_free_bit(zpci_aisb_iv, zdev->aisb);
+ zpci_ibv[zdev->aisb] = NULL;
+ airq_iv_free_bit(zpci_sbv, zdev->aisb);
zdev->aisb = -1UL;
}
if (zdev->aibv) {
@@ -202,13 +209,19 @@ int __init zpci_irq_init(void)
*zpci_airq.lsi_ptr = 1;
rc = -ENOMEM;
- zpci_aisb_iv = airq_iv_create(ZPCI_NR_DEVICES, AIRQ_IV_ALLOC);
- if (!zpci_aisb_iv)
+ zpci_ibv = kcalloc(ZPCI_NR_DEVICES, sizeof(*zpci_ibv), GFP_KERNEL);
+ if (!zpci_ibv)
goto out_airq;
+ zpci_sbv = airq_iv_create(ZPCI_NR_DEVICES, AIRQ_IV_ALLOC);
+ if (!zpci_sbv)
+ goto out_free;
+
zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
return 0;
+out_free:
+ kfree(zpci_ibv);
out_airq:
unregister_adapter_interrupt(&zpci_airq);
out:
@@ -217,6 +230,7 @@ out:
void __init zpci_irq_exit(void)
{
- airq_iv_release(zpci_aisb_iv);
+ airq_iv_release(zpci_sbv);
+ kfree(zpci_ibv);
unregister_adapter_interrupt(&zpci_airq);
}