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Groups > linux.kernel > #1394791 > unrolled thread
| Started by | Ray Jui <ray.jui@broadcom.com> |
|---|---|
| First post | 2016-05-05 01:50 +0200 |
| Last post | 2016-05-05 18:20 +0200 |
| Articles | 4 — 2 participants |
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[PATCH v2] Workaround for Broadcom NS2 gicv2m implementation Ray Jui <ray.jui@broadcom.com> - 2016-05-05 01:50 +0200
[PATCH v2] irqchip/gic-v2m: Add workaround for Broadcom NS2 GICv2m erratum Ray Jui <ray.jui@broadcom.com> - 2016-05-05 01:50 +0200
Re: [PATCH v2] irqchip/gic-v2m: Add workaround for Broadcom NS2 GICv2m erratum Marc Zyngier <marc.zyngier@arm.com> - 2016-05-05 09:40 +0200
Re: [PATCH v2] irqchip/gic-v2m: Add workaround for Broadcom NS2 GICv2m erratum Ray Jui <ray.jui@broadcom.com> - 2016-05-05 18:20 +0200
| From | Ray Jui <ray.jui@broadcom.com> |
|---|---|
| Date | 2016-05-05 01:50 +0200 |
| Subject | [PATCH v2] Workaround for Broadcom NS2 gicv2m implementation |
| Message-ID | <rveIh-5cS-1@gated-at.bofh.it> |
Alex Barba <alex.barba@broadcom.com> discovered Broadcom NS2 GICv2m implementation has an erratum where the MSI data needs to be the SPI number subtracted by an offset of 32, for the correct MSI interrupt to be triggered. We are now implementating the workaround based on readings from the MSI_IIDR register. Patch series is developed based on Linux v4.6-rc1 and available at: https://github.com/Broadcom/arm64-linux/tree/gicv2m-iproc-v2 Changes from v1: - Changed from DT based approach to the approch similar to APM that is based on readings from the MSI_IIDR register Ray Jui (1): irqchip/gic-v2m: Add workaround for Broadcom NS2 GICv2m erratum drivers/irqchip/irq-gic-v2m.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) -- 2.1.4
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| From | Ray Jui <ray.jui@broadcom.com> |
|---|---|
| Date | 2016-05-05 01:50 +0200 |
| Subject | [PATCH v2] irqchip/gic-v2m: Add workaround for Broadcom NS2 GICv2m erratum |
| Message-ID | <rveIh-5cS-3@gated-at.bofh.it> |
| In reply to | #1394791 |
Alex Barba <alex.barba@broadcom.com> discovered Broadcom NS2 GICv2m
implementation has an erratum where the MSI data needs to be the SPI
number subtracted by an offset of 32, for the correct MSI interrupt
to be triggered.
Here we are adding the workaround based on readings from the MSI_IIDR
register, which contains a value unique to Broadcom NS2 GICv2m
Reported-by: Alex Barba <alex.barba@broadcom.com>
Signed-off-by: Ray Jui <ray.jui@broadcom.com>
---
drivers/irqchip/irq-gic-v2m.c | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/drivers/irqchip/irq-gic-v2m.c b/drivers/irqchip/irq-gic-v2m.c
index 28f047c..4c89e27 100644
--- a/drivers/irqchip/irq-gic-v2m.c
+++ b/drivers/irqchip/irq-gic-v2m.c
@@ -49,6 +49,9 @@
/* APM X-Gene with GICv2m MSI_IIDR register value */
#define XGENE_GICV2M_MSI_IIDR 0x06000170
+/* Broadcom NS2 GICv2m MSI_IIDR register value */
+#define BCM_NS2_GICV2M_MSI_IIDR 0x0000013f
+
/* List of flags for specific v2m implementation */
#define GICV2M_NEEDS_SPI_OFFSET 0x00000001
@@ -62,6 +65,7 @@ struct v2m_data {
void __iomem *base; /* GICv2m virt address */
u32 spi_start; /* The SPI number that MSIs start */
u32 nr_spis; /* The number of SPIs for MSIs */
+ u32 spi_offset; /* offset to be subtracted from SPI number */
unsigned long *bm; /* MSI vector bitmap */
u32 flags; /* v2m flags for specific implementation */
};
@@ -102,7 +106,7 @@ static void gicv2m_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
msg->data = data->hwirq;
if (v2m->flags & GICV2M_NEEDS_SPI_OFFSET)
- msg->data -= v2m->spi_start;
+ msg->data -= v2m->spi_offset;
}
static struct irq_chip gicv2m_irq_chip = {
@@ -340,9 +344,18 @@ static int __init gicv2m_init_one(struct fwnode_handle *fwnode,
* different from the standard GICv2m implementation where
* the MSI data is the absolute value within the range from
* spi_start to (spi_start + num_spis).
+ *
+ * Broadom NS2 GICv2m implementation has an erratum where the MSI data
+ * is 'spi_number - 32'
*/
- if (readl_relaxed(v2m->base + V2M_MSI_IIDR) == XGENE_GICV2M_MSI_IIDR)
+ if (readl_relaxed(v2m->base + V2M_MSI_IIDR) == XGENE_GICV2M_MSI_IIDR) {
+ v2m->flags |= GICV2M_NEEDS_SPI_OFFSET;
+ v2m->spi_offset = v2m->spi_start;
+ } else if (readl_relaxed(v2m->base + V2M_MSI_IIDR) ==
+ BCM_NS2_GICV2M_MSI_IIDR) {
v2m->flags |= GICV2M_NEEDS_SPI_OFFSET;
+ v2m->spi_offset = 32;
+ }
v2m->bm = kzalloc(sizeof(long) * BITS_TO_LONGS(v2m->nr_spis),
GFP_KERNEL);
--
2.1.4
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| From | Marc Zyngier <marc.zyngier@arm.com> |
|---|---|
| Date | 2016-05-05 09:40 +0200 |
| Subject | Re: [PATCH v2] irqchip/gic-v2m: Add workaround for Broadcom NS2 GICv2m erratum |
| Message-ID | <rvm38-3Ek-9@gated-at.bofh.it> |
| In reply to | #1394792 |
On 05/05/16 00:47, Ray Jui wrote:
> Alex Barba <alex.barba@broadcom.com> discovered Broadcom NS2 GICv2m
> implementation has an erratum where the MSI data needs to be the SPI
> number subtracted by an offset of 32, for the correct MSI interrupt
> to be triggered.
>
> Here we are adding the workaround based on readings from the MSI_IIDR
> register, which contains a value unique to Broadcom NS2 GICv2m
>
> Reported-by: Alex Barba <alex.barba@broadcom.com>
> Signed-off-by: Ray Jui <ray.jui@broadcom.com>
> ---
> drivers/irqchip/irq-gic-v2m.c | 17 +++++++++++++++--
> 1 file changed, 15 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/irqchip/irq-gic-v2m.c b/drivers/irqchip/irq-gic-v2m.c
> index 28f047c..4c89e27 100644
> --- a/drivers/irqchip/irq-gic-v2m.c
> +++ b/drivers/irqchip/irq-gic-v2m.c
> @@ -49,6 +49,9 @@
> /* APM X-Gene with GICv2m MSI_IIDR register value */
> #define XGENE_GICV2M_MSI_IIDR 0x06000170
>
> +/* Broadcom NS2 GICv2m MSI_IIDR register value */
> +#define BCM_NS2_GICV2M_MSI_IIDR 0x0000013f
> +
> /* List of flags for specific v2m implementation */
> #define GICV2M_NEEDS_SPI_OFFSET 0x00000001
>
> @@ -62,6 +65,7 @@ struct v2m_data {
> void __iomem *base; /* GICv2m virt address */
> u32 spi_start; /* The SPI number that MSIs start */
> u32 nr_spis; /* The number of SPIs for MSIs */
> + u32 spi_offset; /* offset to be subtracted from SPI number */
> unsigned long *bm; /* MSI vector bitmap */
> u32 flags; /* v2m flags for specific implementation */
> };
> @@ -102,7 +106,7 @@ static void gicv2m_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
> msg->data = data->hwirq;
>
> if (v2m->flags & GICV2M_NEEDS_SPI_OFFSET)
> - msg->data -= v2m->spi_start;
> + msg->data -= v2m->spi_offset;
> }
>
> static struct irq_chip gicv2m_irq_chip = {
> @@ -340,9 +344,18 @@ static int __init gicv2m_init_one(struct fwnode_handle *fwnode,
> * different from the standard GICv2m implementation where
> * the MSI data is the absolute value within the range from
> * spi_start to (spi_start + num_spis).
> + *
> + * Broadom NS2 GICv2m implementation has an erratum where the MSI data
> + * is 'spi_number - 32'
> */
> - if (readl_relaxed(v2m->base + V2M_MSI_IIDR) == XGENE_GICV2M_MSI_IIDR)
> + if (readl_relaxed(v2m->base + V2M_MSI_IIDR) == XGENE_GICV2M_MSI_IIDR) {
> + v2m->flags |= GICV2M_NEEDS_SPI_OFFSET;
> + v2m->spi_offset = v2m->spi_start;
> + } else if (readl_relaxed(v2m->base + V2M_MSI_IIDR) ==
> + BCM_NS2_GICV2M_MSI_IIDR) {
> v2m->flags |= GICV2M_NEEDS_SPI_OFFSET;
> + v2m->spi_offset = 32;
> + }
Can we make this a bit less ugly?
switch (readl_relaxed(v2m->base + V2M_MSI_IIDR)) {
case XGENE_GICV2M_MSI_IIDR:
v2m->flags |= GICV2M_NEEDS_SPI_OFFSET;
v2m->spi_offset = v2m->spi_start;
break;
case BCM_NS2_GICV2M_MSI_IIDR:
v2m->flags |= GICV2M_NEEDS_SPI_OFFSET;
v2m->spi_offset = 32;
break;
}
Thanks,
M.
--
Jazz is not dead. It just smells funny...
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| From | Ray Jui <ray.jui@broadcom.com> |
|---|---|
| Date | 2016-05-05 18:20 +0200 |
| Subject | Re: [PATCH v2] irqchip/gic-v2m: Add workaround for Broadcom NS2 GICv2m erratum |
| Message-ID | <rvuam-36M-15@gated-at.bofh.it> |
| In reply to | #1394909 |
On 5/5/2016 12:38 AM, Marc Zyngier wrote:
> On 05/05/16 00:47, Ray Jui wrote:
>> Alex Barba <alex.barba@broadcom.com> discovered Broadcom NS2 GICv2m
>> implementation has an erratum where the MSI data needs to be the SPI
>> number subtracted by an offset of 32, for the correct MSI interrupt
>> to be triggered.
>>
>> Here we are adding the workaround based on readings from the MSI_IIDR
>> register, which contains a value unique to Broadcom NS2 GICv2m
>>
>> Reported-by: Alex Barba <alex.barba@broadcom.com>
>> Signed-off-by: Ray Jui <ray.jui@broadcom.com>
>> ---
>> drivers/irqchip/irq-gic-v2m.c | 17 +++++++++++++++--
>> 1 file changed, 15 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/irqchip/irq-gic-v2m.c b/drivers/irqchip/irq-gic-v2m.c
>> index 28f047c..4c89e27 100644
>> --- a/drivers/irqchip/irq-gic-v2m.c
>> +++ b/drivers/irqchip/irq-gic-v2m.c
>> @@ -49,6 +49,9 @@
>> /* APM X-Gene with GICv2m MSI_IIDR register value */
>> #define XGENE_GICV2M_MSI_IIDR 0x06000170
>>
>> +/* Broadcom NS2 GICv2m MSI_IIDR register value */
>> +#define BCM_NS2_GICV2M_MSI_IIDR 0x0000013f
>> +
>> /* List of flags for specific v2m implementation */
>> #define GICV2M_NEEDS_SPI_OFFSET 0x00000001
>>
>> @@ -62,6 +65,7 @@ struct v2m_data {
>> void __iomem *base; /* GICv2m virt address */
>> u32 spi_start; /* The SPI number that MSIs start */
>> u32 nr_spis; /* The number of SPIs for MSIs */
>> + u32 spi_offset; /* offset to be subtracted from SPI number */
>> unsigned long *bm; /* MSI vector bitmap */
>> u32 flags; /* v2m flags for specific implementation */
>> };
>> @@ -102,7 +106,7 @@ static void gicv2m_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
>> msg->data = data->hwirq;
>>
>> if (v2m->flags & GICV2M_NEEDS_SPI_OFFSET)
>> - msg->data -= v2m->spi_start;
>> + msg->data -= v2m->spi_offset;
>> }
>>
>> static struct irq_chip gicv2m_irq_chip = {
>> @@ -340,9 +344,18 @@ static int __init gicv2m_init_one(struct fwnode_handle *fwnode,
>> * different from the standard GICv2m implementation where
>> * the MSI data is the absolute value within the range from
>> * spi_start to (spi_start + num_spis).
>> + *
>> + * Broadom NS2 GICv2m implementation has an erratum where the MSI data
>> + * is 'spi_number - 32'
>> */
>> - if (readl_relaxed(v2m->base + V2M_MSI_IIDR) == XGENE_GICV2M_MSI_IIDR)
>> + if (readl_relaxed(v2m->base + V2M_MSI_IIDR) == XGENE_GICV2M_MSI_IIDR) {
>> + v2m->flags |= GICV2M_NEEDS_SPI_OFFSET;
>> + v2m->spi_offset = v2m->spi_start;
>> + } else if (readl_relaxed(v2m->base + V2M_MSI_IIDR) ==
>> + BCM_NS2_GICV2M_MSI_IIDR) {
>> v2m->flags |= GICV2M_NEEDS_SPI_OFFSET;
>> + v2m->spi_offset = 32;
>> + }
>
> Can we make this a bit less ugly?
>
> switch (readl_relaxed(v2m->base + V2M_MSI_IIDR)) {
> case XGENE_GICV2M_MSI_IIDR:
> v2m->flags |= GICV2M_NEEDS_SPI_OFFSET;
> v2m->spi_offset = v2m->spi_start;
> break;
> case BCM_NS2_GICV2M_MSI_IIDR:
> v2m->flags |= GICV2M_NEEDS_SPI_OFFSET;
> v2m->spi_offset = 32;
> break;
> }
Okay will do that!
>
> Thanks,
>
> M.
>
Thanks,
Ray
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