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Diffstat (limited to 'arch/s390/pci/pci_irq.c')
-rw-r--r--arch/s390/pci/pci_irq.c168
1 files changed, 104 insertions, 64 deletions
diff --git a/arch/s390/pci/pci_irq.c b/arch/s390/pci/pci_irq.c
index 500cd2dbdf53..84482a921332 100644
--- a/arch/s390/pci/pci_irq.c
+++ b/arch/s390/pci/pci_irq.c
@@ -11,16 +11,10 @@
#include <asm/isc.h>
#include <asm/airq.h>
+#include <asm/tpi.h>
static enum {FLOATING, DIRECTED} irq_delivery;
-#define SIC_IRQ_MODE_ALL 0
-#define SIC_IRQ_MODE_SINGLE 1
-#define SIC_IRQ_MODE_DIRECT 4
-#define SIC_IRQ_MODE_D_ALL 16
-#define SIC_IRQ_MODE_D_SINGLE 17
-#define SIC_IRQ_MODE_SET_CPU 18
-
/*
* summary bit vector
* FLOATING - summary bit per function
@@ -49,6 +43,7 @@ static int zpci_set_airq(struct zpci_dev *zdev)
fib.fmt0.aibvo = 0; /* each zdev has its own interrupt vector */
fib.fmt0.aisb = virt_to_phys(zpci_sbv->vector) + (zdev->aisb / 64) * 8;
fib.fmt0.aisbo = zdev->aisb & 63;
+ fib.gd = zdev->gisa;
return zpci_mod_fc(req, &fib, &status) ? -EIO : 0;
}
@@ -60,6 +55,8 @@ static int zpci_clear_airq(struct zpci_dev *zdev)
struct zpci_fib fib = {0};
u8 cc, status;
+ fib.gd = zdev->gisa;
+
cc = zpci_mod_fc(req, &fib, &status);
if (cc == 3 || (cc == 1 && status == 24))
/* Function already gone or IRQs already deregistered. */
@@ -78,6 +75,7 @@ static int zpci_set_directed_irq(struct zpci_dev *zdev)
fib.fmt = 1;
fib.fmt1.noi = zdev->msi_nr_irqs;
fib.fmt1.dibvo = zdev->msi_first_bit;
+ fib.gd = zdev->gisa;
return zpci_mod_fc(req, &fib, &status) ? -EIO : 0;
}
@@ -90,6 +88,7 @@ static int zpci_clear_directed_irq(struct zpci_dev *zdev)
u8 cc, status;
fib.fmt = 1;
+ fib.gd = zdev->gisa;
cc = zpci_mod_fc(req, &fib, &status);
if (cc == 3 || (cc == 1 && status == 24))
/* Function already gone or IRQs already deregistered. */
@@ -133,7 +132,7 @@ static int zpci_clear_irq(struct zpci_dev *zdev)
static int zpci_set_irq_affinity(struct irq_data *data, const struct cpumask *dest,
bool force)
{
- struct msi_desc *entry = irq_get_msi_desc(data->irq);
+ struct msi_desc *entry = irq_data_get_msi_desc(data);
struct msi_msg msg = entry->msg;
int cpu_addr = smp_cpu_get_cpu_address(cpumask_first(dest));
@@ -153,6 +152,7 @@ static struct irq_chip zpci_irq_chip = {
static void zpci_handle_cpu_local_irq(bool rescan)
{
struct airq_iv *dibv = zpci_ibv[smp_processor_id()];
+ union zpci_sic_iib iib = {{0}};
unsigned long bit;
int irqs_on = 0;
@@ -163,8 +163,8 @@ static void zpci_handle_cpu_local_irq(bool rescan)
if (!rescan || irqs_on++)
/* End of second scan with interrupts on. */
break;
- /* First scan complete, reenable interrupts. */
- if (zpci_set_irq_ctrl(SIC_IRQ_MODE_D_SINGLE, PCI_ISC))
+ /* First scan complete, re-enable interrupts. */
+ if (zpci_set_irq_ctrl(SIC_IRQ_MODE_D_SINGLE, PCI_ISC, &iib))
break;
bit = 0;
continue;
@@ -192,6 +192,7 @@ static void zpci_handle_remote_irq(void *data)
static void zpci_handle_fallback_irq(void)
{
struct cpu_irq_data *cpu_data;
+ union zpci_sic_iib iib = {{0}};
unsigned long cpu;
int irqs_on = 0;
@@ -201,8 +202,8 @@ static void zpci_handle_fallback_irq(void)
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, PCI_ISC))
+ /* First scan complete, re-enable interrupts. */
+ if (zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, PCI_ISC, &iib))
break;
cpu = 0;
continue;
@@ -216,8 +217,11 @@ static void zpci_handle_fallback_irq(void)
}
}
-static void zpci_directed_irq_handler(struct airq_struct *airq, bool floating)
+static void zpci_directed_irq_handler(struct airq_struct *airq,
+ struct tpi_info *tpi_info)
{
+ bool floating = !tpi_info->directed_irq;
+
if (floating) {
inc_irq_stat(IRQIO_PCF);
zpci_handle_fallback_irq();
@@ -227,8 +231,10 @@ static void zpci_directed_irq_handler(struct airq_struct *airq, bool floating)
}
}
-static void zpci_floating_irq_handler(struct airq_struct *airq, bool floating)
+static void zpci_floating_irq_handler(struct airq_struct *airq,
+ struct tpi_info *tpi_info)
{
+ union zpci_sic_iib iib = {{0}};
unsigned long si, ai;
struct airq_iv *aibv;
int irqs_on = 0;
@@ -241,8 +247,8 @@ static void zpci_floating_irq_handler(struct airq_struct *airq, bool floating)
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, PCI_ISC))
+ /* First scan complete, re-enable interrupts. */
+ if (zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, PCI_ISC, &iib))
break;
si = 0;
continue;
@@ -262,61 +268,87 @@ static void zpci_floating_irq_handler(struct airq_struct *airq, bool floating)
}
}
-int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
+static int __alloc_airq(struct zpci_dev *zdev, int msi_vecs,
+ unsigned long *bit)
{
- struct zpci_dev *zdev = to_zpci(pdev);
- unsigned int hwirq, msi_vecs, cpu;
- unsigned long bit;
- struct msi_desc *msi;
- struct msi_msg msg;
- int cpu_addr;
- int rc, irq;
-
- zdev->aisb = -1UL;
- zdev->msi_first_bit = -1U;
- if (type == PCI_CAP_ID_MSI && nvec > 1)
- return 1;
- msi_vecs = min_t(unsigned int, nvec, zdev->max_msi);
-
if (irq_delivery == DIRECTED) {
/* Allocate cpu vector bits */
- bit = airq_iv_alloc(zpci_ibv[0], msi_vecs);
- if (bit == -1UL)
+ *bit = airq_iv_alloc(zpci_ibv[0], msi_vecs);
+ if (*bit == -1UL)
return -EIO;
} else {
/* Allocate adapter summary indicator bit */
- bit = airq_iv_alloc_bit(zpci_sbv);
- if (bit == -1UL)
+ *bit = airq_iv_alloc_bit(zpci_sbv);
+ if (*bit == -1UL)
return -EIO;
- zdev->aisb = bit;
+ zdev->aisb = *bit;
/* Create adapter interrupt vector */
- zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA | AIRQ_IV_BITLOCK);
+ zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA | AIRQ_IV_BITLOCK, NULL);
if (!zdev->aibv)
return -ENOMEM;
/* Wire up shortcut pointer */
- zpci_ibv[bit] = zdev->aibv;
+ zpci_ibv[*bit] = zdev->aibv;
/* Each function has its own interrupt vector */
- bit = 0;
+ *bit = 0;
+ }
+ return 0;
+}
+
+int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
+{
+ unsigned int hwirq, msi_vecs, irqs_per_msi, i, cpu;
+ struct zpci_dev *zdev = to_zpci(pdev);
+ struct msi_desc *msi;
+ struct msi_msg msg;
+ unsigned long bit;
+ int cpu_addr;
+ int rc, irq;
+
+ zdev->aisb = -1UL;
+ zdev->msi_first_bit = -1U;
+
+ msi_vecs = min_t(unsigned int, nvec, zdev->max_msi);
+ if (msi_vecs < nvec) {
+ pr_info("%s requested %d irqs, allocate system limit of %d",
+ pci_name(pdev), nvec, zdev->max_msi);
}
- /* Request MSI interrupts */
+ rc = __alloc_airq(zdev, msi_vecs, &bit);
+ if (rc < 0)
+ return rc;
+
+ /*
+ * Request MSI interrupts:
+ * When using MSI, nvec_used interrupt sources and their irq
+ * descriptors are controlled through one msi descriptor.
+ * Thus the outer loop over msi descriptors shall run only once,
+ * while two inner loops iterate over the interrupt vectors.
+ * When using MSI-X, each interrupt vector/irq descriptor
+ * is bound to exactly one msi descriptor (nvec_used is one).
+ * So the inner loops are executed once, while the outer iterates
+ * over the MSI-X descriptors.
+ */
hwirq = bit;
msi_for_each_desc(msi, &pdev->dev, MSI_DESC_NOTASSOCIATED) {
- rc = -EIO;
if (hwirq - bit >= msi_vecs)
break;
- irq = __irq_alloc_descs(-1, 0, 1, 0, THIS_MODULE,
- (irq_delivery == DIRECTED) ?
- msi->affinity : NULL);
+ irqs_per_msi = min_t(unsigned int, msi_vecs, msi->nvec_used);
+ irq = __irq_alloc_descs(-1, 0, irqs_per_msi, 0, THIS_MODULE,
+ (irq_delivery == DIRECTED) ?
+ msi->affinity : NULL);
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_percpu_irq);
+
+ for (i = 0; i < irqs_per_msi; i++) {
+ rc = irq_set_msi_desc_off(irq, i, msi);
+ if (rc)
+ return rc;
+ irq_set_chip_and_handler(irq + i, &zpci_irq_chip,
+ handle_percpu_irq);
+ }
+
msg.data = hwirq - bit;
if (irq_delivery == DIRECTED) {
if (msi->affinity)
@@ -329,31 +361,35 @@ int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
msg.address_lo |= (cpu_addr << 8);
for_each_possible_cpu(cpu) {
- airq_iv_set_data(zpci_ibv[cpu], hwirq, irq);
+ for (i = 0; i < irqs_per_msi; i++)
+ airq_iv_set_data(zpci_ibv[cpu],
+ hwirq + i, irq + i);
}
} else {
msg.address_lo = zdev->msi_addr & 0xffffffff;
- airq_iv_set_data(zdev->aibv, hwirq, irq);
+ for (i = 0; i < irqs_per_msi; i++)
+ airq_iv_set_data(zdev->aibv, hwirq + i, irq + i);
}
msg.address_hi = zdev->msi_addr >> 32;
pci_write_msi_msg(irq, &msg);
- hwirq++;
+ hwirq += irqs_per_msi;
}
zdev->msi_first_bit = bit;
- zdev->msi_nr_irqs = msi_vecs;
+ zdev->msi_nr_irqs = hwirq - bit;
rc = zpci_set_irq(zdev);
if (rc)
return rc;
- return (msi_vecs == nvec) ? 0 : msi_vecs;
+ return (zdev->msi_nr_irqs == nvec) ? 0 : zdev->msi_nr_irqs;
}
void arch_teardown_msi_irqs(struct pci_dev *pdev)
{
struct zpci_dev *zdev = to_zpci(pdev);
struct msi_desc *msi;
+ unsigned int i;
int rc;
/* Disable interrupts */
@@ -363,8 +399,10 @@ void arch_teardown_msi_irqs(struct pci_dev *pdev)
/* Release MSI interrupts */
msi_for_each_desc(msi, &pdev->dev, MSI_DESC_ASSOCIATED) {
- irq_set_msi_desc(msi->irq, NULL);
- irq_free_desc(msi->irq);
+ for (i = 0; i < msi->nvec_used; i++) {
+ irq_set_msi_desc(msi->irq + i, NULL);
+ irq_free_desc(msi->irq + i);
+ }
msi->msg.address_lo = 0;
msi->msg.address_hi = 0;
msi->msg.data = 0;
@@ -402,11 +440,12 @@ static struct airq_struct zpci_airq = {
static void __init cpu_enable_directed_irq(void *unused)
{
union zpci_sic_iib iib = {{0}};
+ union zpci_sic_iib ziib = {{0}};
- iib.cdiib.dibv_addr = (u64) zpci_ibv[smp_processor_id()]->vector;
+ iib.cdiib.dibv_addr = virt_to_phys(zpci_ibv[smp_processor_id()]->vector);
- __zpci_set_irq_ctrl(SIC_IRQ_MODE_SET_CPU, 0, &iib);
- zpci_set_irq_ctrl(SIC_IRQ_MODE_D_SINGLE, PCI_ISC);
+ zpci_set_irq_ctrl(SIC_IRQ_MODE_SET_CPU, 0, &iib);
+ zpci_set_irq_ctrl(SIC_IRQ_MODE_D_SINGLE, PCI_ISC, &ziib);
}
static int __init zpci_directed_irq_init(void)
@@ -414,14 +453,14 @@ static int __init zpci_directed_irq_init(void)
union zpci_sic_iib iib = {{0}};
unsigned int cpu;
- zpci_sbv = airq_iv_create(num_possible_cpus(), 0);
+ zpci_sbv = airq_iv_create(num_possible_cpus(), 0, NULL);
if (!zpci_sbv)
return -ENOMEM;
iib.diib.isc = PCI_ISC;
iib.diib.nr_cpus = num_possible_cpus();
iib.diib.disb_addr = virt_to_phys(zpci_sbv->vector);
- __zpci_set_irq_ctrl(SIC_IRQ_MODE_DIRECT, 0, &iib);
+ zpci_set_irq_ctrl(SIC_IRQ_MODE_DIRECT, 0, &iib);
zpci_ibv = kcalloc(num_possible_cpus(), sizeof(*zpci_ibv),
GFP_KERNEL);
@@ -436,7 +475,7 @@ static int __init zpci_directed_irq_init(void)
zpci_ibv[cpu] = airq_iv_create(cache_line_size() * BITS_PER_BYTE,
AIRQ_IV_DATA |
AIRQ_IV_CACHELINE |
- (!cpu ? AIRQ_IV_ALLOC : 0));
+ (!cpu ? AIRQ_IV_ALLOC : 0), NULL);
if (!zpci_ibv[cpu])
return -ENOMEM;
}
@@ -453,7 +492,7 @@ static int __init zpci_floating_irq_init(void)
if (!zpci_ibv)
return -ENOMEM;
- zpci_sbv = airq_iv_create(ZPCI_NR_DEVICES, AIRQ_IV_ALLOC);
+ zpci_sbv = airq_iv_create(ZPCI_NR_DEVICES, AIRQ_IV_ALLOC, NULL);
if (!zpci_sbv)
goto out_free;
@@ -466,6 +505,7 @@ out_free:
int __init zpci_irq_init(void)
{
+ union zpci_sic_iib iib = {{0}};
int rc;
irq_delivery = sclp.has_dirq ? DIRECTED : FLOATING;
@@ -497,7 +537,7 @@ int __init zpci_irq_init(void)
* Enable floating IRQs (with suppression after one IRQ). When using
* directed IRQs this enables the fallback path.
*/
- zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, PCI_ISC);
+ zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, PCI_ISC, &iib);
return 0;
out_airq:
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.