[PATCH v5 07/21] s390/pci: externalize the SIC operation controls and routine

Matthew Rosato
2022-04-04T21:28:15Z

A subsequent patch will be issuing SIC from KVM -- export the necessary
routine and make the operation control definitions available from a header.
Because the routine will now be exported, let's rename __zpci_set_irq_ctrl
to zpci_set_irq_ctrl and get rid of the zero'd iib wrapper function of
the same name.

Reviewed-by: Niklas Schnelle <schnelle@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.ibm.com>
Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
---
arch/s390/include/asm/pci_insn.h | 17 +++++++++--------
arch/s390/pci/pci_insn.c | 3 ++-
arch/s390/pci/pci_irq.c | 26 ++++++++++++--------------
3 files changed, 23 insertions(+), 23 deletions(-)

diff --git a/arch/s390/include/asm/pci_insn.h b/arch/s390/include/asm/pci_insn.h
index 61cf9531f68f..5331082fa516 100644
--- a/arch/s390/include/asm/pci_insn.h
+++ b/arch/s390/include/asm/pci_insn.h
@@ -98,6 +98,14 @@ struct zpci_fib {
u32 gd;
} __packed __aligned(8);

+/* Set Interruption Controls Operation Controls */
+#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
+
/* directed interruption information block */
struct zpci_diib {
u32 : 1;
@@ -134,13 +142,6 @@ int __zpci_store(u64 data, u64 req, u64 offset);
int zpci_store(const volatile void __iomem *addr, u64 data, unsigned long len);
int __zpci_store_block(const u64 *data, u64 req, u64 offset);
void zpci_barrier(void);
-int __zpci_set_irq_ctrl(u16 ctl, u8 isc, union zpci_sic_iib *iib);
-
-static inline int zpci_set_irq_ctrl(u16 ctl, u8 isc)
-{
- union zpci_sic_iib iib = {{0}};
-
- return __zpci_set_irq_ctrl(ctl, isc, &iib);
-}
+int zpci_set_irq_ctrl(u16 ctl, u8 isc, union zpci_sic_iib *iib);

#endif
diff --git a/arch/s390/pci/pci_insn.c b/arch/s390/pci/pci_insn.c
index 1710d006ee93..4c6967b73932 100644
--- a/arch/s390/pci/pci_insn.c
+++ b/arch/s390/pci/pci_insn.c
@@ -98,7 +98,7 @@ int zpci_refresh_trans(u64 fn, u64 addr, u64 range)
}

/* Set Interruption Controls */
-int __zpci_set_irq_ctrl(u16 ctl, u8 isc, union zpci_sic_iib *iib)
+int zpci_set_irq_ctrl(u16 ctl, u8 isc, union zpci_sic_iib *iib)
{
if (!test_facility(72))
return -EIO;
@@ -109,6 +109,7 @@ int __zpci_set_irq_ctrl(u16 ctl, u8 isc, union zpci_sic_iib *iib)

return 0;
}
+EXPORT_SYMBOL_GPL(zpci_set_irq_ctrl);

/* PCI Load */
static inline int ____pcilg(u64 *data, u64 req, u64 offset, u8 *status)
diff --git a/arch/s390/pci/pci_irq.c b/arch/s390/pci/pci_irq.c
index 87c7d121c255..f2b3145b6697 100644
--- a/arch/s390/pci/pci_irq.c
+++ b/arch/s390/pci/pci_irq.c
@@ -15,13 +15,6 @@

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
@@ -154,6 +147,7 @@ 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;

@@ -165,7 +159,7 @@ static void zpci_handle_cpu_local_irq(bool rescan)
/* 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))
+ if (zpci_set_irq_ctrl(SIC_IRQ_MODE_D_SINGLE, PCI_ISC, &iib))
break;
bit = 0;
continue;
@@ -193,6 +187,7 @@ 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;

@@ -203,7 +198,7 @@ static void zpci_handle_fallback_irq(void)
/* End of second scan with interrupts on. */
break;
/* First scan complete, reenable interrupts. */
- if (zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, PCI_ISC))
+ if (zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, PCI_ISC, &iib))
break;
cpu = 0;
continue;
@@ -234,6 +229,7 @@ static void zpci_directed_irq_handler(struct airq_struct *airq,
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;
@@ -247,7 +243,7 @@ static void zpci_floating_irq_handler(struct airq_struct *airq,
/* End of second scan with interrupts on. */
break;
/* First scan complete, reenable interrupts. */
- if (zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, PCI_ISC))
+ if (zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, PCI_ISC, &iib))
break;
si = 0;
continue;
@@ -407,11 +403,12 @@ 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;

- __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)
@@ -426,7 +423,7 @@ static int __init zpci_directed_irq_init(void)
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);
@@ -471,6 +468,7 @@ static int __init zpci_floating_irq_init(void)

int __init zpci_irq_init(void)
{
+ union zpci_sic_iib iib = {{0}};
int rc;

irq_delivery = sclp.has_dirq ? DIRECTED : FLOATING;
@@ -502,7 +500,7 @@ 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:
--
2.27.0