Currently, many common functions perform the same operations to calculate
GIC register addresses. This patch consolidates the similar code into
a separate helper function to improve maintainability and reduce duplication.
This refactoring also simplifies the implementation of eSPI support in future
changes.
Signed-off-by: Leonid Komarianskyi <leonid_komarianskyi@epam.com>
Reviewed-by: Volodymyr Babchuk <volodymyr_babchuk@epam.com>
---
Changes in V4:
- no changes
Changes in V3:
- changed panic() in get_addr_by_offset() to printing warning and
ASSERT_UNREACHABLE()
- added verification of return pointer from get_addr_by_offset() in the
callers
- moved invocation of get_addr_by_offset() from spinlock guards, since
it is not necessarry
- added RB from Volodymyr Babchuk
Changes in V2:
- no changes
---
xen/arch/arm/gic-v3.c | 114 +++++++++++++++++++++++----------
xen/arch/arm/include/asm/irq.h | 1 +
2 files changed, 81 insertions(+), 34 deletions(-)
diff --git a/xen/arch/arm/gic-v3.c b/xen/arch/arm/gic-v3.c
index cd3e1acf79..a959fefebe 100644
--- a/xen/arch/arm/gic-v3.c
+++ b/xen/arch/arm/gic-v3.c
@@ -445,17 +445,67 @@ static void gicv3_dump_state(const struct vcpu *v)
}
}
+static void __iomem *get_addr_by_offset(struct irq_desc *irqd, u32 offset)
+{
+ switch ( irqd->irq )
+ {
+ case 0 ... (NR_GIC_LOCAL_IRQS - 1):
+ switch ( offset )
+ {
+ case GICD_ISENABLER:
+ case GICD_ICENABLER:
+ case GICD_ISPENDR:
+ case GICD_ICPENDR:
+ case GICD_ISACTIVER:
+ case GICD_ICACTIVER:
+ return (GICD_RDIST_SGI_BASE + offset);
+ case GICD_ICFGR:
+ return (GICD_RDIST_SGI_BASE + GICR_ICFGR1);
+ case GICD_IPRIORITYR:
+ return (GICD_RDIST_SGI_BASE + GICR_IPRIORITYR0 + irqd->irq);
+ default:
+ break;
+ }
+ case NR_GIC_LOCAL_IRQS ... SPI_MAX_INTID:
+ switch ( offset )
+ {
+ case GICD_ISENABLER:
+ case GICD_ICENABLER:
+ case GICD_ISPENDR:
+ case GICD_ICPENDR:
+ case GICD_ISACTIVER:
+ case GICD_ICACTIVER:
+ return (GICD + offset + (irqd->irq / 32) * 4);
+ case GICD_ICFGR:
+ return (GICD + GICD_ICFGR + (irqd->irq / 16) * 4);
+ case GICD_IROUTER:
+ return (GICD + GICD_IROUTER + irqd->irq * 8);
+ case GICD_IPRIORITYR:
+ return (GICD + GICD_IPRIORITYR + irqd->irq);
+ default:
+ break;
+ }
+ default:
+ break;
+ }
+
+ /* Something went wrong, we shouldn't be able to reach here */
+ printk(XENLOG_WARNING "GICv3: WARNING: Invalid offset 0x%x for IRQ#%d",
+ offset, irqd->irq);
+ ASSERT_UNREACHABLE();
+
+ return NULL;
+}
+
static void gicv3_poke_irq(struct irq_desc *irqd, u32 offset, bool wait_for_rwp)
{
u32 mask = 1U << (irqd->irq % 32);
- void __iomem *base;
+ void __iomem *addr = get_addr_by_offset(irqd, offset);
- if ( irqd->irq < NR_GIC_LOCAL_IRQS )
- base = GICD_RDIST_SGI_BASE;
- else
- base = GICD;
+ if ( addr == NULL )
+ return;
- writel_relaxed(mask, base + offset + (irqd->irq / 32) * 4);
+ writel_relaxed(mask, addr);
if ( wait_for_rwp )
gicv3_wait_for_rwp(irqd->irq);
@@ -463,15 +513,12 @@ static void gicv3_poke_irq(struct irq_desc *irqd, u32 offset, bool wait_for_rwp)
static bool gicv3_peek_irq(struct irq_desc *irqd, u32 offset)
{
- void __iomem *base;
- unsigned int irq = irqd->irq;
+ void __iomem *addr = get_addr_by_offset(irqd, offset);
- if ( irq >= NR_GIC_LOCAL_IRQS)
- base = GICD + (irq / 32) * 4;
- else
- base = GICD_RDIST_SGI_BASE;
+ if ( addr == NULL )
+ return false;
- return !!(readl(base + offset) & (1U << (irq % 32)));
+ return !!(readl(addr) & (1U << (irqd->irq % 32)));
}
static void gicv3_unmask_irq(struct irq_desc *irqd)
@@ -558,30 +605,28 @@ static inline uint64_t gicv3_mpidr_to_affinity(int cpu)
static void gicv3_set_irq_type(struct irq_desc *desc, unsigned int type)
{
uint32_t cfg, actual, edgebit;
- void __iomem *base;
- unsigned int irq = desc->irq;
+ void __iomem *addr;
/* SGI's are always edge-triggered not need to call GICD_ICFGR0 */
- ASSERT(irq >= NR_GIC_SGI);
+ ASSERT(desc->irq >= NR_GIC_SGI);
- spin_lock(&gicv3.lock);
+ addr = get_addr_by_offset(desc, GICD_ICFGR);
+ if ( addr == NULL )
+ return;
- if ( irq >= NR_GIC_LOCAL_IRQS)
- base = GICD + GICD_ICFGR + (irq / 16) * 4;
- else
- base = GICD_RDIST_SGI_BASE + GICR_ICFGR1;
+ spin_lock(&gicv3.lock);
- cfg = readl_relaxed(base);
+ cfg = readl_relaxed(addr);
- edgebit = 2u << (2 * (irq % 16));
+ edgebit = 2u << (2 * (desc->irq % 16));
if ( type & IRQ_TYPE_LEVEL_MASK )
cfg &= ~edgebit;
else if ( type & IRQ_TYPE_EDGE_BOTH )
cfg |= edgebit;
- writel_relaxed(cfg, base);
+ writel_relaxed(cfg, addr);
- actual = readl_relaxed(base);
+ actual = readl_relaxed(addr);
if ( ( cfg & edgebit ) ^ ( actual & edgebit ) )
{
printk(XENLOG_WARNING "GICv3: WARNING: "
@@ -600,16 +645,13 @@ static void gicv3_set_irq_type(struct irq_desc *desc, unsigned int type)
static void gicv3_set_irq_priority(struct irq_desc *desc,
unsigned int priority)
{
- unsigned int irq = desc->irq;
+ void __iomem *addr = get_addr_by_offset(desc, GICD_IPRIORITYR);
- spin_lock(&gicv3.lock);
-
- /* Set priority */
- if ( irq < NR_GIC_LOCAL_IRQS )
- writeb_relaxed(priority, GICD_RDIST_SGI_BASE + GICR_IPRIORITYR0 + irq);
- else
- writeb_relaxed(priority, GICD + GICD_IPRIORITYR + irq);
+ if ( addr == NULL )
+ return;
+ spin_lock(&gicv3.lock);
+ writeb_relaxed(priority, addr);
spin_unlock(&gicv3.lock);
}
@@ -1273,6 +1315,10 @@ static void gicv3_irq_set_affinity(struct irq_desc *desc, const cpumask_t *mask)
{
unsigned int cpu;
uint64_t affinity;
+ void __iomem *addr = get_addr_by_offset(desc, GICD_IROUTER);
+
+ if ( addr == NULL )
+ return;
ASSERT(!cpumask_empty(mask));
@@ -1284,7 +1330,7 @@ static void gicv3_irq_set_affinity(struct irq_desc *desc, const cpumask_t *mask)
affinity &= ~GICD_IROUTER_SPI_MODE_ANY;
if ( desc->irq >= NR_GIC_LOCAL_IRQS )
- writeq_relaxed_non_atomic(affinity, (GICD + GICD_IROUTER + desc->irq * 8));
+ writeq_relaxed_non_atomic(affinity, addr);
spin_unlock(&gicv3.lock);
}
diff --git a/xen/arch/arm/include/asm/irq.h b/xen/arch/arm/include/asm/irq.h
index fce7e42a33..5bc6475eb4 100644
--- a/xen/arch/arm/include/asm/irq.h
+++ b/xen/arch/arm/include/asm/irq.h
@@ -29,6 +29,7 @@ struct arch_irq_desc {
*/
#define NR_IRQS 1024
+#define SPI_MAX_INTID 1019
#define LPI_OFFSET 8192
/* LPIs are always numbered starting at 8192, so 0 is a good invalid case. */
--
2.34.1Hi Leonid,
On 27/08/2025 19:24, Leonid Komarianskyi wrote:
> Currently, many common functions perform the same operations to calculate
> GIC register addresses. This patch consolidates the similar code into
> a separate helper function to improve maintainability and reduce duplication.
> This refactoring also simplifies the implementation of eSPI support in future
> changes.
>
> Signed-off-by: Leonid Komarianskyi <leonid_komarianskyi@epam.com>
> Reviewed-by: Volodymyr Babchuk <volodymyr_babchuk@epam.com>
>
> ---
> Changes in V4:
> - no changes
>
> Changes in V3:
> - changed panic() in get_addr_by_offset() to printing warning and
> ASSERT_UNREACHABLE()
> - added verification of return pointer from get_addr_by_offset() in the
> callers
> - moved invocation of get_addr_by_offset() from spinlock guards, since
> it is not necessarry
> - added RB from Volodymyr Babchuk
Procces remark, here you said the Reviewed-by from Volodymyr was added
in v3. However, given the changes you made this should have been
invalidated (reviewed-by means the person read the code and confirmed it
is correct).
I see Volodymyr confirmed his reviewed-by on v3. So no issue, but this
should have been clarified in the changelog.
>
> Changes in V2:
> - no changes
> ---
> xen/arch/arm/gic-v3.c | 114 +++++++++++++++++++++++----------
> xen/arch/arm/include/asm/irq.h | 1 +
> 2 files changed, 81 insertions(+), 34 deletions(-)
>
> diff --git a/xen/arch/arm/gic-v3.c b/xen/arch/arm/gic-v3.c
> index cd3e1acf79..a959fefebe 100644
> --- a/xen/arch/arm/gic-v3.c
> +++ b/xen/arch/arm/gic-v3.c
> @@ -445,17 +445,67 @@ static void gicv3_dump_state(const struct vcpu *v)
> }
> }
>
> +static void __iomem *get_addr_by_offset(struct irq_desc *irqd, u32 offset)
> +{
> + switch ( irqd->irq )
> + {
> + case 0 ... (NR_GIC_LOCAL_IRQS - 1):
> + switch ( offset )
> + {
> + case GICD_ISENABLER:
> + case GICD_ICENABLER:
> + case GICD_ISPENDR:
> + case GICD_ICPENDR:
> + case GICD_ISACTIVER:
> + case GICD_ICACTIVER:
> + return (GICD_RDIST_SGI_BASE + offset);
> + case GICD_ICFGR:
> + return (GICD_RDIST_SGI_BASE + GICR_ICFGR1);
> + case GICD_IPRIORITYR:
> + return (GICD_RDIST_SGI_BASE + GICR_IPRIORITYR0 + irqd->irq);
> + default:
> + break;
> + }
> + case NR_GIC_LOCAL_IRQS ... SPI_MAX_INTID:
> + switch ( offset )
> + {
> + case GICD_ISENABLER:
> + case GICD_ICENABLER:
> + case GICD_ISPENDR:
> + case GICD_ICPENDR:
> + case GICD_ISACTIVER:
> + case GICD_ICACTIVER:
> + return (GICD + offset + (irqd->irq / 32) * 4);
> + case GICD_ICFGR:
> + return (GICD + GICD_ICFGR + (irqd->irq / 16) * 4);
> + case GICD_IROUTER:
> + return (GICD + GICD_IROUTER + irqd->irq * 8);
> + case GICD_IPRIORITYR:
> + return (GICD + GICD_IPRIORITYR + irqd->irq);
> + default:
> + break;
> + }
> + default:
> + break;
> + }
> +
> + /* Something went wrong, we shouldn't be able to reach here */
> + printk(XENLOG_WARNING "GICv3: WARNING: Invalid offset 0x%x for IRQ#%d",
NIT: I am not expecting the interrupt to be < 0. So it would be
preferable to use %u.
Acked-by: Julien Grall <jgrall@amazon.com>
Cheers,
--
Julien Grall
Hi Julien,
On 28.08.25 15:00, Julien Grall wrote:
> Hi Leonid,
>
> On 27/08/2025 19:24, Leonid Komarianskyi wrote:
>> Currently, many common functions perform the same operations to calculate
>> GIC register addresses. This patch consolidates the similar code into
>> a separate helper function to improve maintainability and reduce
>> duplication.
>> This refactoring also simplifies the implementation of eSPI support in
>> future
>> changes.
>>
>> Signed-off-by: Leonid Komarianskyi <leonid_komarianskyi@epam.com>
>> Reviewed-by: Volodymyr Babchuk <volodymyr_babchuk@epam.com>
>>
>> ---
>> Changes in V4:
>> - no changes
>>
>> Changes in V3:
>> - changed panic() in get_addr_by_offset() to printing warning and
>> ASSERT_UNREACHABLE()
>> - added verification of return pointer from get_addr_by_offset() in the
>> callers
>> - moved invocation of get_addr_by_offset() from spinlock guards, since
>> it is not necessarry
>> - added RB from Volodymyr Babchuk
>
> Procces remark, here you said the Reviewed-by from Volodymyr was added
> in v3. However, given the changes you made this should have been
> invalidated (reviewed-by means the person read the code and confirmed it
> is correct).
>
> I see Volodymyr confirmed his reviewed-by on v3. So no issue, but this
> should have been clarified in the changelog.
>
Thank you for your explanation.
Just to clarify: would it be okay to leave the RB tag (with appropriate
text in the changelog) if I fix some minor nit from another reviewer in
the next version, like in this patch?
>>
>> Changes in V2:
>> - no changes
>> ---
>> xen/arch/arm/gic-v3.c | 114 +++++++++++++++++++++++----------
>> xen/arch/arm/include/asm/irq.h | 1 +
>> 2 files changed, 81 insertions(+), 34 deletions(-)
>>
>> diff --git a/xen/arch/arm/gic-v3.c b/xen/arch/arm/gic-v3.c
>> index cd3e1acf79..a959fefebe 100644
>> --- a/xen/arch/arm/gic-v3.c
>> +++ b/xen/arch/arm/gic-v3.c
>> @@ -445,17 +445,67 @@ static void gicv3_dump_state(const struct vcpu *v)
>> }
>> }
>> +static void __iomem *get_addr_by_offset(struct irq_desc *irqd, u32
>> offset)
>> +{
>> + switch ( irqd->irq )
>> + {
>> + case 0 ... (NR_GIC_LOCAL_IRQS - 1):
>> + switch ( offset )
>> + {
>> + case GICD_ISENABLER:
>> + case GICD_ICENABLER:
>> + case GICD_ISPENDR:
>> + case GICD_ICPENDR:
>> + case GICD_ISACTIVER:
>> + case GICD_ICACTIVER:
>> + return (GICD_RDIST_SGI_BASE + offset);
>> + case GICD_ICFGR:
>> + return (GICD_RDIST_SGI_BASE + GICR_ICFGR1);
>> + case GICD_IPRIORITYR:
>> + return (GICD_RDIST_SGI_BASE + GICR_IPRIORITYR0 + irqd->irq);
>> + default:
>> + break;
>> + }
>> + case NR_GIC_LOCAL_IRQS ... SPI_MAX_INTID:
>> + switch ( offset )
>> + {
>> + case GICD_ISENABLER:
>> + case GICD_ICENABLER:
>> + case GICD_ISPENDR:
>> + case GICD_ICPENDR:
>> + case GICD_ISACTIVER:
>> + case GICD_ICACTIVER:
>> + return (GICD + offset + (irqd->irq / 32) * 4);
>> + case GICD_ICFGR:
>> + return (GICD + GICD_ICFGR + (irqd->irq / 16) * 4);
>> + case GICD_IROUTER:
>> + return (GICD + GICD_IROUTER + irqd->irq * 8);
>> + case GICD_IPRIORITYR:
>> + return (GICD + GICD_IPRIORITYR + irqd->irq);
>> + default:
>> + break;
>> + }
>> + default:
>> + break;
>> + }
>> +
>> + /* Something went wrong, we shouldn't be able to reach here */
>> + printk(XENLOG_WARNING "GICv3: WARNING: Invalid offset 0x%x for
>> IRQ#%d",
>
> NIT: I am not expecting the interrupt to be < 0. So it would be
> preferable to use %u.
>
> Acked-by: Julien Grall <jgrall@amazon.com>
>
> Cheers,
>
Thank you for your AB. I will fix the nit in V5.
Best regards,
Leonid
Hi Leonid, On 28/08/2025 17:17, Leonid Komarianskyi wrote: > On 28.08.25 15:00, Julien Grall wrote: >> Hi Leonid, >> >> On 27/08/2025 19:24, Leonid Komarianskyi wrote: >>> Currently, many common functions perform the same operations to calculate >>> GIC register addresses. This patch consolidates the similar code into >>> a separate helper function to improve maintainability and reduce >>> duplication. >>> This refactoring also simplifies the implementation of eSPI support in >>> future >>> changes. >>> >>> Signed-off-by: Leonid Komarianskyi <leonid_komarianskyi@epam.com> >>> Reviewed-by: Volodymyr Babchuk <volodymyr_babchuk@epam.com> >>> >>> --- >>> Changes in V4: >>> - no changes >>> >>> Changes in V3: >>> - changed panic() in get_addr_by_offset() to printing warning and >>> ASSERT_UNREACHABLE() >>> - added verification of return pointer from get_addr_by_offset() in the >>> callers >>> - moved invocation of get_addr_by_offset() from spinlock guards, since >>> it is not necessarry >>> - added RB from Volodymyr Babchuk >> >> Procces remark, here you said the Reviewed-by from Volodymyr was added >> in v3. However, given the changes you made this should have been >> invalidated (reviewed-by means the person read the code and confirmed it >> is correct). >> >> I see Volodymyr confirmed his reviewed-by on v3. So no issue, but this >> should have been clarified in the changelog. >> > > Thank you for your explanation. > Just to clarify: would it be okay to leave the RB tag (with appropriate > text in the changelog) if I fix some minor nit from another reviewer in > the next version, like in this patch? It depends on the change. In general, typoes or coding style changes (I include s/uX/uint_X) are fine to keep the review by. Anything else may need a review again. Acked-by are different because they don't carry a full review. So for slightly bigger change it would be fine to keep. But if the logic is fully rewritten, then they would need to be dropped. Cheers, -- Julien Grall
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