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Message-ID: <bc3b60f7-833d-6d50-dcd0-b102a190c69d@linux.ibm.com>
Date: Wed, 8 Dec 2021 14:09:36 +0100
From: Christian Borntraeger <borntraeger@...ux.ibm.com>
To: Matthew Rosato <mjrosato@...ux.ibm.com>, linux-s390@...r.kernel.org
Cc: alex.williamson@...hat.com, cohuck@...hat.com,
schnelle@...ux.ibm.com, farman@...ux.ibm.com, pmorel@...ux.ibm.com,
hca@...ux.ibm.com, gor@...ux.ibm.com,
gerald.schaefer@...ux.ibm.com, agordeev@...ux.ibm.com,
frankja@...ux.ibm.com, david@...hat.com, imbrenda@...ux.ibm.com,
vneethv@...ux.ibm.com, oberpar@...ux.ibm.com, freude@...ux.ibm.com,
thuth@...hat.com, pasic@...ux.ibm.com, kvm@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 07/32] s390/pci: externalize the SIC operation controls
and routine
Am 07.12.21 um 21:57 schrieb Matthew Rosato:
> 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 swap the purpose of
> zpci_set_irq_ctrl and __zpci_set_irq_ctrl, leaving the latter as a static
> within pci_irq.c only for SIC calls that don't specify an iib.
Maybe it would be simpler to export the __ version instead of renaming everything.
Whatever Niklas prefers.
>
> Signed-off-by: Matthew Rosato <mjrosato@...ux.ibm.com>
> ---
> arch/s390/include/asm/pci_insn.h | 17 +++++++++--------
> arch/s390/pci/pci_insn.c | 3 ++-
> arch/s390/pci/pci_irq.c | 28 ++++++++++++++--------------
> 3 files changed, 25 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 28d863aaafea..d1a8bd43ce26 100644
> --- a/arch/s390/pci/pci_insn.c
> +++ b/arch/s390/pci/pci_insn.c
> @@ -97,7 +97,7 @@ 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;
> @@ -108,6 +108,7 @@ 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 dfd4f3276a6d..6b29e39496d1 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
> @@ -145,6 +138,13 @@ static int zpci_set_irq_affinity(struct irq_data *data, const struct cpumask *de
> return IRQ_SET_MASK_OK;
> }
>
> +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);
> +}
> +
> static struct irq_chip zpci_irq_chip = {
> .name = "PCI-MSI",
> .irq_unmask = pci_msi_unmask_irq,
> @@ -165,7 +165,7 @@ 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))
> break;
> bit = 0;
> continue;
> @@ -203,7 +203,7 @@ 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))
> break;
> cpu = 0;
> continue;
> @@ -247,7 +247,7 @@ 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))
> break;
> si = 0;
> continue;
> @@ -412,8 +412,8 @@ static void __init cpu_enable_directed_irq(void *unused)
>
> 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);
> }
>
> static int __init zpci_directed_irq_init(void)
> @@ -428,7 +428,7 @@ static int __init zpci_directed_irq_init(void)
> iib.diib.isc = PCI_ISC;
> iib.diib.nr_cpus = num_possible_cpus();
> iib.diib.disb_addr = (u64) 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);
> @@ -504,7 +504,7 @@ 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);
>
> return 0;
> out_airq:
>
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