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[PATCH 11/14] ppc/pnv: Compute the PHB index from the PHB4 PEC model

Cédric Le Goater posted 14 patches 4 years, 2 months ago
There is a newer version of this series
[PATCH 11/14] ppc/pnv: Compute the PHB index from the PHB4 PEC model
Posted by Cédric Le Goater 4 years, 2 months ago 
Use the num_stacks class attribute to compute the PHB index depending
on the PEC index :

  * PEC0 provides 1 PHB  (PHB0)
  * PEC1 provides 2 PHBs (PHB1 and PHB2)
  * PEC2 provides 3 PHBs (PHB3, PHB4 and PHB5)

Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 hw/pci-host/pnv_phb4_pec.c | 16 ++++++++++++++++
 hw/ppc/pnv.c               |  4 +---
 2 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/hw/pci-host/pnv_phb4_pec.c b/hw/pci-host/pnv_phb4_pec.c
index 293909b5cb90..a7dd4173d598 100644
--- a/hw/pci-host/pnv_phb4_pec.c
+++ b/hw/pci-host/pnv_phb4_pec.c
@@ -374,6 +374,19 @@ static void pnv_pec_instance_init(Object *obj)
     }
 }
 
+static int pnv_pec_phb_offset(PnvPhb4PecState *pec)
+{
+    PnvPhb4PecClass *pecc = PNV_PHB4_PEC_GET_CLASS(pec);
+    int index = pec->index;
+    int offset = 0;
+
+    while (index--) {
+        offset += pecc->num_stacks[index];
+    }
+
+    return offset;
+}
+
 static void pnv_pec_realize(DeviceState *dev, Error **errp)
 {
     PnvPhb4PecState *pec = PNV_PHB4_PEC(dev);
@@ -394,8 +407,10 @@ static void pnv_pec_realize(DeviceState *dev, Error **errp)
     for (i = 0; i < pec->num_stacks; i++) {
         PnvPhb4PecStack *stack = &pec->stacks[i];
         Object *stk_obj = OBJECT(stack);
+        int phb_id = pnv_pec_phb_offset(pec) + i;
 
         object_property_set_int(stk_obj, "stack-no", i, &error_abort);
+        object_property_set_int(stk_obj, "phb-id", phb_id, &error_abort);
         object_property_set_link(stk_obj, "pec", OBJECT(pec), &error_abort);
         if (!qdev_realize(DEVICE(stk_obj), NULL, errp)) {
             return;
@@ -538,6 +553,7 @@ static void pnv_pec_stk_instance_init(Object *obj)
     PnvPhb4PecStack *stack = PNV_PHB4_PEC_STACK(obj);
 
     object_initialize_child(obj, "phb", &stack->phb, TYPE_PNV_PHB4);
+    object_property_add_alias(obj, "phb-id", OBJECT(&stack->phb), "index");
 }
 
 static void pnv_pec_stk_realize(DeviceState *dev, Error **errp)
diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
index 957f0bdfaa6b..f8b0b2a28383 100644
--- a/hw/ppc/pnv.c
+++ b/hw/ppc/pnv.c
@@ -1371,7 +1371,6 @@ static void pnv_chip_power9_phb_realize(PnvChip *chip, Error **errp)
 {
     Pnv9Chip *chip9 = PNV9_CHIP(chip);
     int i, j;
-    int phb_id = 0;
 
     for (i = 0; i < chip->num_pecs; i++) {
         PnvPhb4PecState *pec = &chip9->pecs[i];
@@ -1396,11 +1395,10 @@ static void pnv_chip_power9_phb_realize(PnvChip *chip, Error **errp)
         pnv_xscom_add_subregion(chip, pec_nest_base, &pec->nest_regs_mr);
         pnv_xscom_add_subregion(chip, pec_pci_base, &pec->pci_regs_mr);
 
-        for (j = 0; j < pec->num_stacks; j++, phb_id++) {
+        for (j = 0; j < pec->num_stacks; j++) {
             PnvPhb4PecStack *stack = &pec->stacks[j];
             Object *obj = OBJECT(&stack->phb);
 
-            object_property_set_int(obj, "index", phb_id, &error_fatal);
             object_property_set_int(obj, "chip-id", chip->chip_id,
                                     &error_fatal);
             object_property_set_int(obj, "version", pecc->version,
-- 
2.31.1
Re: [PATCH 11/14] ppc/pnv: Compute the PHB index from the PHB4 PEC model
Posted by Frederic Barrat 4 years, 2 months ago 

On 02/12/2021 15:42, Cédric Le Goater wrote:
> Use the num_stacks class attribute to compute the PHB index depending
> on the PEC index :
> 
>    * PEC0 provides 1 PHB  (PHB0)
>    * PEC1 provides 2 PHBs (PHB1 and PHB2)
>    * PEC2 provides 3 PHBs (PHB3, PHB4 and PHB5)
> 
> Signed-off-by: Cédric Le Goater <clg@kaod.org>
> ---
>   hw/pci-host/pnv_phb4_pec.c | 16 ++++++++++++++++
>   hw/ppc/pnv.c               |  4 +---
>   2 files changed, 17 insertions(+), 3 deletions(-)
> 
> diff --git a/hw/pci-host/pnv_phb4_pec.c b/hw/pci-host/pnv_phb4_pec.c
> index 293909b5cb90..a7dd4173d598 100644
> --- a/hw/pci-host/pnv_phb4_pec.c
> +++ b/hw/pci-host/pnv_phb4_pec.c
> @@ -374,6 +374,19 @@ static void pnv_pec_instance_init(Object *obj)
>       }
>   }
>   
> +static int pnv_pec_phb_offset(PnvPhb4PecState *pec)
> +{
> +    PnvPhb4PecClass *pecc = PNV_PHB4_PEC_GET_CLASS(pec);
> +    int index = pec->index;
> +    int offset = 0;
> +
> +    while (index--) {
> +        offset += pecc->num_stacks[index];
> +    }
> +
> +    return offset;
> +}
> +


That seems overly complicated to me and not very readable. The log 
message is a lot more clear. I'd prefer we have a switch() statement 
returning the base PHB ID based on the PEC index.

   Fred



>   static void pnv_pec_realize(DeviceState *dev, Error **errp)
>   {
>       PnvPhb4PecState *pec = PNV_PHB4_PEC(dev);
> @@ -394,8 +407,10 @@ static void pnv_pec_realize(DeviceState *dev, Error **errp)
>       for (i = 0; i < pec->num_stacks; i++) {
>           PnvPhb4PecStack *stack = &pec->stacks[i];
>           Object *stk_obj = OBJECT(stack);
> +        int phb_id = pnv_pec_phb_offset(pec) + i;
>   
>           object_property_set_int(stk_obj, "stack-no", i, &error_abort);
> +        object_property_set_int(stk_obj, "phb-id", phb_id, &error_abort);
>           object_property_set_link(stk_obj, "pec", OBJECT(pec), &error_abort);
>           if (!qdev_realize(DEVICE(stk_obj), NULL, errp)) {
>               return;
> @@ -538,6 +553,7 @@ static void pnv_pec_stk_instance_init(Object *obj)
>       PnvPhb4PecStack *stack = PNV_PHB4_PEC_STACK(obj);
>   
>       object_initialize_child(obj, "phb", &stack->phb, TYPE_PNV_PHB4);
> +    object_property_add_alias(obj, "phb-id", OBJECT(&stack->phb), "index");
>   }
>   
>   static void pnv_pec_stk_realize(DeviceState *dev, Error **errp)
> diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
> index 957f0bdfaa6b..f8b0b2a28383 100644
> --- a/hw/ppc/pnv.c
> +++ b/hw/ppc/pnv.c
> @@ -1371,7 +1371,6 @@ static void pnv_chip_power9_phb_realize(PnvChip *chip, Error **errp)
>   {
>       Pnv9Chip *chip9 = PNV9_CHIP(chip);
>       int i, j;
> -    int phb_id = 0;
>   
>       for (i = 0; i < chip->num_pecs; i++) {
>           PnvPhb4PecState *pec = &chip9->pecs[i];
> @@ -1396,11 +1395,10 @@ static void pnv_chip_power9_phb_realize(PnvChip *chip, Error **errp)
>           pnv_xscom_add_subregion(chip, pec_nest_base, &pec->nest_regs_mr);
>           pnv_xscom_add_subregion(chip, pec_pci_base, &pec->pci_regs_mr);
>   
> -        for (j = 0; j < pec->num_stacks; j++, phb_id++) {
> +        for (j = 0; j < pec->num_stacks; j++) {
>               PnvPhb4PecStack *stack = &pec->stacks[j];
>               Object *obj = OBJECT(&stack->phb);
>   
> -            object_property_set_int(obj, "index", phb_id, &error_fatal);
>               object_property_set_int(obj, "chip-id", chip->chip_id,
>                                       &error_fatal);
>               object_property_set_int(obj, "version", pecc->version,
>
Re: [PATCH 11/14] ppc/pnv: Compute the PHB index from the PHB4 PEC model
Posted by Cédric Le Goater 4 years, 2 months ago 
On 12/7/21 11:06, Frederic Barrat wrote:
> 
> 
> On 02/12/2021 15:42, Cédric Le Goater wrote:
>> Use the num_stacks class attribute to compute the PHB index depending
>> on the PEC index :
>>
>>    * PEC0 provides 1 PHB  (PHB0)
>>    * PEC1 provides 2 PHBs (PHB1 and PHB2)
>>    * PEC2 provides 3 PHBs (PHB3, PHB4 and PHB5)
>>
>> Signed-off-by: Cédric Le Goater <clg@kaod.org>
>> ---
>>   hw/pci-host/pnv_phb4_pec.c | 16 ++++++++++++++++
>>   hw/ppc/pnv.c               |  4 +---
>>   2 files changed, 17 insertions(+), 3 deletions(-)
>>
>> diff --git a/hw/pci-host/pnv_phb4_pec.c b/hw/pci-host/pnv_phb4_pec.c
>> index 293909b5cb90..a7dd4173d598 100644
>> --- a/hw/pci-host/pnv_phb4_pec.c
>> +++ b/hw/pci-host/pnv_phb4_pec.c
>> @@ -374,6 +374,19 @@ static void pnv_pec_instance_init(Object *obj)
>>       }
>>   }
>> +static int pnv_pec_phb_offset(PnvPhb4PecState *pec)
>> +{
>> +    PnvPhb4PecClass *pecc = PNV_PHB4_PEC_GET_CLASS(pec);
>> +    int index = pec->index;
>> +    int offset = 0;
>> +
>> +    while (index--) {
>> +        offset += pecc->num_stacks[index];
>> +    }
>> +
>> +    return offset;
>> +}
>> +
> 
> 
> That seems overly complicated to me and not very readable. The log message is a lot more clear. I'd prefer we have a switch() statement returning the base PHB ID based on the PEC index.

yes I agree but PHB5 is on its way and this is compatible. See :

   https://github.com/legoater/qemu/commit/d7caa1b74f3f8a90815fa086b87a1bd467b7c988

I will take any good idea fitting both :)

Thanks,

C.

> 
>    Fred
> 
> 
> 
>>   static void pnv_pec_realize(DeviceState *dev, Error **errp)
>>   {
>>       PnvPhb4PecState *pec = PNV_PHB4_PEC(dev);
>> @@ -394,8 +407,10 @@ static void pnv_pec_realize(DeviceState *dev, Error **errp)
>>       for (i = 0; i < pec->num_stacks; i++) {
>>           PnvPhb4PecStack *stack = &pec->stacks[i];
>>           Object *stk_obj = OBJECT(stack);
>> +        int phb_id = pnv_pec_phb_offset(pec) + i;
>>           object_property_set_int(stk_obj, "stack-no", i, &error_abort);
>> +        object_property_set_int(stk_obj, "phb-id", phb_id, &error_abort);
>>           object_property_set_link(stk_obj, "pec", OBJECT(pec), &error_abort);
>>           if (!qdev_realize(DEVICE(stk_obj), NULL, errp)) {
>>               return;
>> @@ -538,6 +553,7 @@ static void pnv_pec_stk_instance_init(Object *obj)
>>       PnvPhb4PecStack *stack = PNV_PHB4_PEC_STACK(obj);
>>       object_initialize_child(obj, "phb", &stack->phb, TYPE_PNV_PHB4);
>> +    object_property_add_alias(obj, "phb-id", OBJECT(&stack->phb), "index");
>>   }
>>   static void pnv_pec_stk_realize(DeviceState *dev, Error **errp)
>> diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
>> index 957f0bdfaa6b..f8b0b2a28383 100644
>> --- a/hw/ppc/pnv.c
>> +++ b/hw/ppc/pnv.c
>> @@ -1371,7 +1371,6 @@ static void pnv_chip_power9_phb_realize(PnvChip *chip, Error **errp)
>>   {
>>       Pnv9Chip *chip9 = PNV9_CHIP(chip);
>>       int i, j;
>> -    int phb_id = 0;
>>       for (i = 0; i < chip->num_pecs; i++) {
>>           PnvPhb4PecState *pec = &chip9->pecs[i];
>> @@ -1396,11 +1395,10 @@ static void pnv_chip_power9_phb_realize(PnvChip *chip, Error **errp)
>>           pnv_xscom_add_subregion(chip, pec_nest_base, &pec->nest_regs_mr);
>>           pnv_xscom_add_subregion(chip, pec_pci_base, &pec->pci_regs_mr);
>> -        for (j = 0; j < pec->num_stacks; j++, phb_id++) {
>> +        for (j = 0; j < pec->num_stacks; j++) {
>>               PnvPhb4PecStack *stack = &pec->stacks[j];
>>               Object *obj = OBJECT(&stack->phb);
>> -            object_property_set_int(obj, "index", phb_id, &error_fatal);
>>               object_property_set_int(obj, "chip-id", chip->chip_id,
>>                                       &error_fatal);
>>               object_property_set_int(obj, "version", pecc->version,
>>
Re: [PATCH 11/14] ppc/pnv: Compute the PHB index from the PHB4 PEC model
Posted by Daniel Henrique Barboza 4 years, 2 months ago 

On 12/2/21 11:42, Cédric Le Goater wrote:
> Use the num_stacks class attribute to compute the PHB index depending
> on the PEC index :
> 
>    * PEC0 provides 1 PHB  (PHB0)
>    * PEC1 provides 2 PHBs (PHB1 and PHB2)
>    * PEC2 provides 3 PHBs (PHB3, PHB4 and PHB5)
> 
> Signed-off-by: Cédric Le Goater <clg@kaod.org>
> ---

Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>

>   hw/pci-host/pnv_phb4_pec.c | 16 ++++++++++++++++
>   hw/ppc/pnv.c               |  4 +---
>   2 files changed, 17 insertions(+), 3 deletions(-)
> 
> diff --git a/hw/pci-host/pnv_phb4_pec.c b/hw/pci-host/pnv_phb4_pec.c
> index 293909b5cb90..a7dd4173d598 100644
> --- a/hw/pci-host/pnv_phb4_pec.c
> +++ b/hw/pci-host/pnv_phb4_pec.c
> @@ -374,6 +374,19 @@ static void pnv_pec_instance_init(Object *obj)
>       }
>   }
>   
> +static int pnv_pec_phb_offset(PnvPhb4PecState *pec)
> +{
> +    PnvPhb4PecClass *pecc = PNV_PHB4_PEC_GET_CLASS(pec);
> +    int index = pec->index;
> +    int offset = 0;
> +
> +    while (index--) {
> +        offset += pecc->num_stacks[index];
> +    }
> +
> +    return offset;
> +}
> +
>   static void pnv_pec_realize(DeviceState *dev, Error **errp)
>   {
>       PnvPhb4PecState *pec = PNV_PHB4_PEC(dev);
> @@ -394,8 +407,10 @@ static void pnv_pec_realize(DeviceState *dev, Error **errp)
>       for (i = 0; i < pec->num_stacks; i++) {
>           PnvPhb4PecStack *stack = &pec->stacks[i];
>           Object *stk_obj = OBJECT(stack);
> +        int phb_id = pnv_pec_phb_offset(pec) + i;
>   
>           object_property_set_int(stk_obj, "stack-no", i, &error_abort);
> +        object_property_set_int(stk_obj, "phb-id", phb_id, &error_abort);
>           object_property_set_link(stk_obj, "pec", OBJECT(pec), &error_abort);
>           if (!qdev_realize(DEVICE(stk_obj), NULL, errp)) {
>               return;
> @@ -538,6 +553,7 @@ static void pnv_pec_stk_instance_init(Object *obj)
>       PnvPhb4PecStack *stack = PNV_PHB4_PEC_STACK(obj);
>   
>       object_initialize_child(obj, "phb", &stack->phb, TYPE_PNV_PHB4);
> +    object_property_add_alias(obj, "phb-id", OBJECT(&stack->phb), "index");
>   }
>   
>   static void pnv_pec_stk_realize(DeviceState *dev, Error **errp)
> diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
> index 957f0bdfaa6b..f8b0b2a28383 100644
> --- a/hw/ppc/pnv.c
> +++ b/hw/ppc/pnv.c
> @@ -1371,7 +1371,6 @@ static void pnv_chip_power9_phb_realize(PnvChip *chip, Error **errp)
>   {
>       Pnv9Chip *chip9 = PNV9_CHIP(chip);
>       int i, j;
> -    int phb_id = 0;
>   
>       for (i = 0; i < chip->num_pecs; i++) {
>           PnvPhb4PecState *pec = &chip9->pecs[i];
> @@ -1396,11 +1395,10 @@ static void pnv_chip_power9_phb_realize(PnvChip *chip, Error **errp)
>           pnv_xscom_add_subregion(chip, pec_nest_base, &pec->nest_regs_mr);
>           pnv_xscom_add_subregion(chip, pec_pci_base, &pec->pci_regs_mr);
>   
> -        for (j = 0; j < pec->num_stacks; j++, phb_id++) {
> +        for (j = 0; j < pec->num_stacks; j++) {
>               PnvPhb4PecStack *stack = &pec->stacks[j];
>               Object *obj = OBJECT(&stack->phb);
>   
> -            object_property_set_int(obj, "index", phb_id, &error_fatal);
>               object_property_set_int(obj, "chip-id", chip->chip_id,
>                                       &error_fatal);
>               object_property_set_int(obj, "version", pecc->version,
>

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