Re: [PATCH v10 15/21] ARM64 / ACPI: Introduce ACPI_IRQ_MODEL_GIC and register device's gsi
From: Hanjun Guo
Date: Fri Mar 20 2015 - 09:08:36 EST
On 2015/3/20 3:37, Will Deacon wrote:
> On Thu, Mar 19, 2015 at 10:12:05AM +0000, Lorenzo Pieralisi wrote:
>> On Thu, Mar 19, 2015 at 03:45:35AM +0000, Hanjun Guo wrote:
>>>>> + if (trigger == ACPI_EDGE_SENSITIVE &&
>>>>> + polarity == ACPI_ACTIVE_LOW)
>>>>> + irq_type = IRQ_TYPE_EDGE_FALLING;
>>>>> + else if (trigger == ACPI_EDGE_SENSITIVE &&
>>>>> + polarity == ACPI_ACTIVE_HIGH)
>>>>> + irq_type = IRQ_TYPE_EDGE_RISING;
>>>>> + else if (trigger == ACPI_LEVEL_SENSITIVE &&
>>>>> + polarity == ACPI_ACTIVE_LOW)
>>>>> + irq_type = IRQ_TYPE_LEVEL_LOW;
>>>>> + else if (trigger == ACPI_LEVEL_SENSITIVE &&
>>>>> + polarity == ACPI_ACTIVE_HIGH)
>>>>> + irq_type = IRQ_TYPE_LEVEL_HIGH;
>>>>> + else
>>>>> + irq_type = IRQ_TYPE_NONE;
>>>>> +
>>>>> + /*
>>>>> + * Since only one GIC is supported in ACPI 5.0, we can
>>>>> + * create mapping refer to the default domain
>>>>> + */
>>>>> + irq = irq_create_mapping(NULL, gsi);
>>>>> + if (!irq)
>>>>> + return irq;
>>>>> +
>>>>> + /* Set irq type if specified and different than the current one */
>>>>> + if (irq_type != IRQ_TYPE_NONE &&
>>>>> + irq_type != irq_get_trigger_type(irq))
>>>>> + irq_set_irq_type(irq, irq_type);
>>>>> + return irq;
>>>>> +}
>>>>> +EXPORT_SYMBOL_GPL(acpi_register_gsi);
>>>> I see you've still got this buried in the arch code. Is there any plan to
>>>> move it out, as I moaned about this in the last version of the series and
>>>> nothing seems to have changed?
>>> Ah, sorry. Last time when I was in Hongkong for LCA this Feb, I
>>> discussed with Lorenzo and he had a look into that too, he also met some
>>> obstacles to do that, so Lorenzo said that he will talk to you about
>>> this (Lorenzo, correct me if I'm wrong due to hearing problems of much
>>> noise in that room where we were talking).
>>>
>>> Anyway, if we move those functions to core code, such as irqdomain code,
>>> which will be compiled for x86 too, we can only set those functions as
>>> _weak, or we guard with them as #ifdef CONFIG_ARM64 ... #endif, so for
>>> me, it's really not a big deal to move those code out of arch/arm64, but
>>> I'm still open for suggestions if you can do that in a proper way.
>> You heard me clear and sound in HK, Will has a point and I looked into
>> this. Code is generic but not enough to be useful on other arches at
>> the moment, I need more time to look into this and see if we can move
>> this code to acpi core in a way that makes sense, to have, as you say,
>> a "default" implementation.
> Yeah, just something guarded by a CONFIG option (probably not ARM64
> though) would be enough, I think. Nothing too fancy.
Hi Will,
It is ARM64 related code and ACPI specific, I can come up with following code:
arch/arm64/kernel/acpi.c | 67 ---------------------------------------------
kernel/irq/irqdomain.c | 70 ++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 70 insertions(+), 67 deletions(-)
diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
index 5819ef7..d207544 100644
--- a/arch/arm64/kernel/acpi.c
+++ b/arch/arm64/kernel/acpi.c
@@ -224,73 +224,6 @@ void __init acpi_init_cpus(void)
pr_info("%d CPUs enabled, %d CPUs total\n", enabled_cpus, total_cpus);
}
-int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
-{
- *irq = irq_find_mapping(NULL, gsi);
-
- return 0;
-}
-EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
-
-/*
- * success: return IRQ number (>0)
- * failure: return =< 0
- */
-int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
-{
- unsigned int irq;
- unsigned int irq_type;
-
- /*
- * ACPI have no bindings to indicate SPI or PPI, so we
- * use different mappings from DT in ACPI.
- *
- * For FDT
- * PPI interrupt: in the range [0, 15];
- * SPI interrupt: in the range [0, 987];
- *
- * For ACPI, GSI should be unique so using
- * the hwirq directly for the mapping:
- * PPI interrupt: in the range [16, 31];
- * SPI interrupt: in the range [32, 1019];
- */
-
- if (trigger == ACPI_EDGE_SENSITIVE &&
- polarity == ACPI_ACTIVE_LOW)
- irq_type = IRQ_TYPE_EDGE_FALLING;
- else if (trigger == ACPI_EDGE_SENSITIVE &&
- polarity == ACPI_ACTIVE_HIGH)
- irq_type = IRQ_TYPE_EDGE_RISING;
- else if (trigger == ACPI_LEVEL_SENSITIVE &&
- polarity == ACPI_ACTIVE_LOW)
- irq_type = IRQ_TYPE_LEVEL_LOW;
- else if (trigger == ACPI_LEVEL_SENSITIVE &&
- polarity == ACPI_ACTIVE_HIGH)
- irq_type = IRQ_TYPE_LEVEL_HIGH;
- else
- irq_type = IRQ_TYPE_NONE;
-
- /*
- * Since only one GIC is supported in ACPI 5.0, we can
- * create mapping refer to the default domain
- */
- irq = irq_create_mapping(NULL, gsi);
- if (!irq)
- return irq;
-
- /* Set irq type if specified and different than the current one */
- if (irq_type != IRQ_TYPE_NONE &&
- irq_type != irq_get_trigger_type(irq))
- irq_set_irq_type(irq, irq_type);
- return irq;
-}
-EXPORT_SYMBOL_GPL(acpi_register_gsi);
-
-void acpi_unregister_gsi(u32 gsi)
-{
-}
-EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
-
static int __init acpi_parse_fadt(struct acpi_table_header *table)
{
struct acpi_table_fadt *fadt = (struct acpi_table_fadt *)table;
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 7fac311..5a614bc 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -1,5 +1,6 @@
#define pr_fmt(fmt) "irq: " fmt
+#include <linux/acpi.h>
#include <linux/debugfs.h>
#include <linux/hardirq.h>
#include <linux/interrupt.h>
@@ -568,6 +569,75 @@ unsigned int irq_find_mapping(struct irq_domain *domain,
}
EXPORT_SYMBOL_GPL(irq_find_mapping);
+#if defined(CONFIG_ARM64) && defined(CONFIG_ACPI)
+int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
+{
+ *irq = irq_find_mapping(NULL, gsi);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
+
+/*
+ * success: return IRQ number (>0)
+ * failure: return =< 0
+ */
+int acpi_register_gsi(struct device *dev, u32 gsi, int trigger, int polarity)
+{
+ unsigned int irq;
+ unsigned int irq_type;
+
+ /*
+ * ACPI have no bindings to indicate SPI or PPI, so we
+ * use different mappings from DT in ACPI.
+ *
+ * For FDT
+ * PPI interrupt: in the range [0, 15];
+ * SPI interrupt: in the range [0, 987];
+ *
+ * For ACPI, GSI should be unique so using
+ * the hwirq directly for the mapping:
+ * PPI interrupt: in the range [16, 31];
+ * SPI interrupt: in the range [32, 1019];
+ */
+
+ if (trigger == ACPI_EDGE_SENSITIVE &&
+ polarity == ACPI_ACTIVE_LOW)
+ irq_type = IRQ_TYPE_EDGE_FALLING;
+ else if (trigger == ACPI_EDGE_SENSITIVE &&
+ polarity == ACPI_ACTIVE_HIGH)
+ irq_type = IRQ_TYPE_EDGE_RISING;
+ else if (trigger == ACPI_LEVEL_SENSITIVE &&
+ polarity == ACPI_ACTIVE_LOW)
+ irq_type = IRQ_TYPE_LEVEL_LOW;
+ else if (trigger == ACPI_LEVEL_SENSITIVE &&
+ polarity == ACPI_ACTIVE_HIGH)
+ irq_type = IRQ_TYPE_LEVEL_HIGH;
+ else
+ irq_type = IRQ_TYPE_NONE;
+
+ /*
+ * Since only one GIC is supported in ACPI 5.1, we can
+ * create mapping refer to the default domain
+ */
+ irq = irq_create_mapping(NULL, gsi);
+ if (!irq)
+ return irq;
+
+ /* Set irq type if specified and different than the current one */
+ if (irq_type != IRQ_TYPE_NONE &&
+ irq_type != irq_get_trigger_type(irq))
+ irq_set_irq_type(irq, irq_type);
+ return irq;
+}
+EXPORT_SYMBOL_GPL(acpi_register_gsi);
+
+void acpi_unregister_gsi(u32 gsi)
+{
+}
+EXPORT_SYMBOL_GPL(acpi_unregister_gsi);
+#endif /* CONFIG_ARM64 && CONFIG_ACPI */
+
#ifdef CONFIG_IRQ_DOMAIN_DEBUG
static int virq_debug_show(struct seq_file *m, void *private)
{
is this the way you prefered?
Thanks
Hanjun
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