Linux-ACPI Archive on lore.kernel.org
 help / color / Atom feed
* [PATCH v3] ACPI/IORT: Fix PMCG node always look for a single ID mapping.
@ 2020-05-14  0:12 Tuan Phan
  2020-05-14  9:29 ` Lorenzo Pieralisi
  0 siblings, 1 reply; 3+ messages in thread
From: Tuan Phan @ 2020-05-14  0:12 UTC (permalink / raw)
  Cc: patches, Lorenzo Pieralisi, Hanjun Guo, Sudeep Holla,
	Rafael J. Wysocki, Len Brown, Will Deacon, Robin Murphy,
	Neil Leeder, Shameer Kolothum, linux-acpi, linux-arm-kernel,
	linux-kernel

PMCG node can have zero ID mapping if its overflow interrupt
is wire based. The code to parse PMCG node can not assume it will
have a single ID mapping.

Fixes: 24e516049360 ("ACPI/IORT: Add support for PMCG")
Reviewed-by: Hanjun Guo <guoahanjun@huawei.com>
Signed-off-by: Tuan Phan <tuanphan@os.amperecomputing.com>
---
v1 -> v2:
- Use pmcg node to detect wired base overflow interrupt.

v2 -> v3:
- Address Hanjun and Robin's comments.

 drivers/acpi/arm64/iort.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index ed3d2d1..12bb70e 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -414,6 +414,7 @@ static struct acpi_iort_node *iort_node_get_id(struct acpi_iort_node *node,
 static int iort_get_id_mapping_index(struct acpi_iort_node *node)
 {
 	struct acpi_iort_smmu_v3 *smmu;
+	struct acpi_iort_pmcg *pmcg;
 
 	switch (node->type) {
 	case ACPI_IORT_NODE_SMMU_V3:
@@ -441,6 +442,10 @@ static int iort_get_id_mapping_index(struct acpi_iort_node *node)
 
 		return smmu->id_mapping_index;
 	case ACPI_IORT_NODE_PMCG:
+		pmcg = (struct acpi_iort_pmcg *)node->node_data;
+		if (pmcg->overflow_gsiv || node->mapping_count == 0)
+			return -EINVAL;
+
 		return 0;
 	default:
 		return -EINVAL;
-- 
2.7.4


^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [PATCH v3] ACPI/IORT: Fix PMCG node always look for a single ID mapping.
  2020-05-14  0:12 [PATCH v3] ACPI/IORT: Fix PMCG node always look for a single ID mapping Tuan Phan
@ 2020-05-14  9:29 ` Lorenzo Pieralisi
  2020-05-14 18:06   ` Tuan Phan
  0 siblings, 1 reply; 3+ messages in thread
From: Lorenzo Pieralisi @ 2020-05-14  9:29 UTC (permalink / raw)
  To: Tuan Phan
  Cc: patches, Hanjun Guo, Sudeep Holla, Rafael J. Wysocki, Len Brown,
	Will Deacon, Robin Murphy, Neil Leeder, Shameer Kolothum,
	linux-acpi, linux-arm-kernel, linux-kernel

Please update the subject:

Subject: "ACPI/IORT: Fix PMCG node single ID mapping handling"

On Wed, May 13, 2020 at 05:12:02PM -0700, Tuan Phan wrote:
> PMCG node can have zero ID mapping if its overflow interrupt
> is wire based. The code to parse PMCG node can not assume it will
> have a single ID mapping.

"An IORT PMCG node can have no ID mapping if its overflow interrupt is
wire based therefore the code that parses the PMCG node can not assume
the node will always have a single mapping present at index 0.

Fix iort_get_id_mapping_index() by checking for an overflow interrupt
and mapping count."

> Fixes: 24e516049360 ("ACPI/IORT: Add support for PMCG")
> Reviewed-by: Hanjun Guo <guoahanjun@huawei.com>
> Signed-off-by: Tuan Phan <tuanphan@os.amperecomputing.com>
> ---
> v1 -> v2:
> - Use pmcg node to detect wired base overflow interrupt.
> 
> v2 -> v3:
> - Address Hanjun and Robin's comments.
> 
>  drivers/acpi/arm64/iort.c | 5 +++++
>  1 file changed, 5 insertions(+)

Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

> diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
> index ed3d2d1..12bb70e 100644
> --- a/drivers/acpi/arm64/iort.c
> +++ b/drivers/acpi/arm64/iort.c
> @@ -414,6 +414,7 @@ static struct acpi_iort_node *iort_node_get_id(struct acpi_iort_node *node,
>  static int iort_get_id_mapping_index(struct acpi_iort_node *node)
>  {
>  	struct acpi_iort_smmu_v3 *smmu;
> +	struct acpi_iort_pmcg *pmcg;
>  
>  	switch (node->type) {
>  	case ACPI_IORT_NODE_SMMU_V3:
> @@ -441,6 +442,10 @@ static int iort_get_id_mapping_index(struct acpi_iort_node *node)
>  
>  		return smmu->id_mapping_index;
>  	case ACPI_IORT_NODE_PMCG:
> +		pmcg = (struct acpi_iort_pmcg *)node->node_data;
> +		if (pmcg->overflow_gsiv || node->mapping_count == 0)
> +			return -EINVAL;
> +
>  		return 0;
>  	default:
>  		return -EINVAL;
> -- 
> 2.7.4
> 

^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [PATCH v3] ACPI/IORT: Fix PMCG node always look for a single ID mapping.
  2020-05-14  9:29 ` Lorenzo Pieralisi
@ 2020-05-14 18:06   ` Tuan Phan
  0 siblings, 0 replies; 3+ messages in thread
From: Tuan Phan @ 2020-05-14 18:06 UTC (permalink / raw)
  To: Lorenzo Pieralisi
  Cc: Tuan Phan, patches, Hanjun Guo, Sudeep Holla, Rafael J. Wysocki,
	Len Brown, Will Deacon, Robin Murphy, Neil Leeder,
	Shameer Kolothum, linux-acpi, linux-arm-kernel, linux-kernel



> On May 14, 2020, at 2:29 AM, Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> wrote:
> 
> Please update the subject:
> 
> Subject: "ACPI/IORT: Fix PMCG node single ID mapping handling"
> 
> On Wed, May 13, 2020 at 05:12:02PM -0700, Tuan Phan wrote:
>> PMCG node can have zero ID mapping if its overflow interrupt
>> is wire based. The code to parse PMCG node can not assume it will
>> have a single ID mapping.
> 
> "An IORT PMCG node can have no ID mapping if its overflow interrupt is
> wire based therefore the code that parses the PMCG node can not assume
> the node will always have a single mapping present at index 0.
> 
> Fix iort_get_id_mapping_index() by checking for an overflow interrupt
> and mapping count."

Thanks for the correction. Will update it.
> 
>> Fixes: 24e516049360 ("ACPI/IORT: Add support for PMCG")
>> Reviewed-by: Hanjun Guo <guoahanjun@huawei.com>
>> Signed-off-by: Tuan Phan <tuanphan@os.amperecomputing.com>
>> ---
>> v1 -> v2:
>> - Use pmcg node to detect wired base overflow interrupt.
>> 
>> v2 -> v3:
>> - Address Hanjun and Robin's comments.
>> 
>> drivers/acpi/arm64/iort.c | 5 +++++
>> 1 file changed, 5 insertions(+)
> 
> Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> 
>> diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
>> index ed3d2d1..12bb70e 100644
>> --- a/drivers/acpi/arm64/iort.c
>> +++ b/drivers/acpi/arm64/iort.c
>> @@ -414,6 +414,7 @@ static struct acpi_iort_node *iort_node_get_id(struct acpi_iort_node *node,
>> static int iort_get_id_mapping_index(struct acpi_iort_node *node)
>> {
>> 	struct acpi_iort_smmu_v3 *smmu;
>> +	struct acpi_iort_pmcg *pmcg;
>> 
>> 	switch (node->type) {
>> 	case ACPI_IORT_NODE_SMMU_V3:
>> @@ -441,6 +442,10 @@ static int iort_get_id_mapping_index(struct acpi_iort_node *node)
>> 
>> 		return smmu->id_mapping_index;
>> 	case ACPI_IORT_NODE_PMCG:
>> +		pmcg = (struct acpi_iort_pmcg *)node->node_data;
>> +		if (pmcg->overflow_gsiv || node->mapping_count == 0)
>> +			return -EINVAL;
>> +
>> 		return 0;
>> 	default:
>> 		return -EINVAL;
>> -- 
>> 2.7.4
>> 


^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, back to index

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-05-14  0:12 [PATCH v3] ACPI/IORT: Fix PMCG node always look for a single ID mapping Tuan Phan
2020-05-14  9:29 ` Lorenzo Pieralisi
2020-05-14 18:06   ` Tuan Phan

Linux-ACPI Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-acpi/0 linux-acpi/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-acpi linux-acpi/ https://lore.kernel.org/linux-acpi \
		linux-acpi@vger.kernel.org
	public-inbox-index linux-acpi

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-acpi


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git