diff mbox series

[v2,2/6] ACPI: Do not create new NUMA domains from ACPI static tables that are not SRAT

Message ID 20200717175959.899775-3-Jonathan.Cameron@huawei.com
State New
Headers show
Series ACPI: Only create NUMA nodes from entries in SRAT or SRAT emulation. | expand

Commit Message

Jonathan Cameron July 17, 2020, 5:59 p.m. UTC
Several ACPI static tables contain references to proximity domains.
ACPI 6.3 has clarified that only entries in SRAT may define a new domain
(sec 5.2.16).

Those tables described in the ACPI spec have additional clarifying text.

NFIT: Table 5-132,

"Integer that represents the proximity domain to which the memory belongs.
 This number must match with corresponding entry in the SRAT table."

HMAT: Table 5-145,

"... This number must match with the corresponding entry in the SRAT
 table's processor affinity structure ... if the initiator is a processor,
 or the Generic Initiator Affinity Structure if the initiator is a generic
 initiator".

IORT and DMAR are defined by external specifications.

Intel Virtualization Technology for Directed I/O Rev 3.1 does not make any
explicit statements, but the general SRAT statement above will still apply.
https://software.intel.com/sites/default/files/managed/c5/15/vt-directed-io-spec.pdf

IO Remapping Table, Platform Design Document rev D, also makes not explicit
statement, but refers to ACPI SRAT table for more information and again the
generic SRAT statement above applies.
https://developer.arm.com/documentation/den0049/d/

In conclusion, any proximity domain specified in these tables, should be a
reference to a proximity domain also found in SRAT, and they should not be able
to instantiate a new domain.  Hence we switch to pxm_to_node() which will only
return existing nodes.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 drivers/acpi/arm64/iort.c  | 2 +-
 drivers/acpi/nfit/core.c   | 3 +--
 drivers/acpi/numa/hmat.c   | 2 +-
 drivers/iommu/intel/dmar.c | 2 +-
 4 files changed, 4 insertions(+), 5 deletions(-)

Comments

Barry Song July 18, 2020, 5:14 a.m. UTC | #1
> -----Original Message-----
> From: Jonathan Cameron
> Sent: Saturday, July 18, 2020 6:00 AM
> To: linux-mm@kvack.org; linux-acpi@vger.kernel.org;
> linux-arm-kernel@lists.infradead.org; x86@kernel.org
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>; Bjorn Helgaas
> <bhelgaas@google.com>; linux-pci@vger.kernel.org; martin@geanix.com; Ingo
> Molnar <mingo@redhat.com>; linux-ia64@vger.kernel.org; Tony Luck
> <tony.luck@intel.com>; Fenghua Yu <fenghua.yu@intel.com>; Thomas
> Gleixner <tglx@linutronix.de>; Linuxarm <linuxarm@huawei.com>; Dan
> Williams <dan.j.williams@intel.com>; Song Bao Hua (Barry Song)
> <song.bao.hua@hisilicon.com>; Jonathan Cameron
> <jonathan.cameron@huawei.com>
> Subject: [PATCH v2 2/6] ACPI: Do not create new NUMA domains from ACPI
> static tables that are not SRAT
> 
> Several ACPI static tables contain references to proximity domains.
> ACPI 6.3 has clarified that only entries in SRAT may define a new domain
> (sec 5.2.16).
> 
> Those tables described in the ACPI spec have additional clarifying text.
> 
> NFIT: Table 5-132,
> 
> "Integer that represents the proximity domain to which the memory belongs.
>  This number must match with corresponding entry in the SRAT table."
> 
> HMAT: Table 5-145,
> 
> "... This number must match with the corresponding entry in the SRAT
>  table's processor affinity structure ... if the initiator is a processor,
>  or the Generic Initiator Affinity Structure if the initiator is a generic
>  initiator".
> 
> IORT and DMAR are defined by external specifications.
> 
> Intel Virtualization Technology for Directed I/O Rev 3.1 does not make any
> explicit statements, but the general SRAT statement above will still apply.
> https://software.intel.com/sites/default/files/managed/c5/15/vt-directed-io-s
> pec.pdf
> 
> IO Remapping Table, Platform Design Document rev D, also makes not explicit
> statement, but refers to ACPI SRAT table for more information and again the
> generic SRAT statement above applies.
> https://developer.arm.com/documentation/den0049/d/
> 
> In conclusion, any proximity domain specified in these tables, should be a
> reference to a proximity domain also found in SRAT, and they should not be
> able
> to instantiate a new domain.  Hence we switch to pxm_to_node() which will
> only
> return existing nodes.
> 
> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Much better than v1 which was using a bool parameter "false" to stop acpi_map_pxm_to_node()
from creating node.

And pxm_to_node() has been used by some other places as an API which is
serving the transition from pxm to node.

Reviewed-by: Barry Song <song.bao.hua@hisilicon.com>

> ---
>  drivers/acpi/arm64/iort.c  | 2 +-
>  drivers/acpi/nfit/core.c   | 3 +--
>  drivers/acpi/numa/hmat.c   | 2 +-
>  drivers/iommu/intel/dmar.c | 2 +-
>  4 files changed, 4 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
> index 28a6b387e80e..eb0f158612c8 100644
> --- a/drivers/acpi/arm64/iort.c
> +++ b/drivers/acpi/arm64/iort.c
> @@ -1293,7 +1293,7 @@ static int  __init
> arm_smmu_v3_set_proximity(struct device *dev,
> 
>  	smmu = (struct acpi_iort_smmu_v3 *)node->node_data;
>  	if (smmu->flags & ACPI_IORT_SMMU_V3_PXM_VALID) {
> -		int dev_node = acpi_map_pxm_to_node(smmu->pxm);
> +		int dev_node = pxm_to_node(smmu->pxm);
> 
>  		if (dev_node != NUMA_NO_NODE && !node_online(dev_node))
>  			return -EINVAL;
> diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
> index 7c138a4edc03..d933a4636d00 100644
> --- a/drivers/acpi/nfit/core.c
> +++ b/drivers/acpi/nfit/core.c
> @@ -2947,8 +2947,7 @@ static int acpi_nfit_register_region(struct
> acpi_nfit_desc *acpi_desc,
>  	if (spa->flags & ACPI_NFIT_PROXIMITY_VALID) {
>  		ndr_desc->numa_node = acpi_map_pxm_to_online_node(
>  						spa->proximity_domain);
> -		ndr_desc->target_node = acpi_map_pxm_to_node(
> -				spa->proximity_domain);
> +		ndr_desc->target_node = pxm_to_node(spa->proximity_domain);
>  	} else {
>  		ndr_desc->numa_node = NUMA_NO_NODE;
>  		ndr_desc->target_node = NUMA_NO_NODE;
> diff --git a/drivers/acpi/numa/hmat.c b/drivers/acpi/numa/hmat.c
> index 2c32cfb72370..cf6df2df26cd 100644
> --- a/drivers/acpi/numa/hmat.c
> +++ b/drivers/acpi/numa/hmat.c
> @@ -666,7 +666,7 @@ static void hmat_register_target_device(struct
> memory_target *target,
> 
>  	pdev->dev.numa_node =
> acpi_map_pxm_to_online_node(target->memory_pxm);
>  	info = (struct memregion_info) {
> -		.target_node = acpi_map_pxm_to_node(target->memory_pxm),
> +		.target_node = pxm_to_node(target->memory_pxm),
>  	};
>  	rc = platform_device_add_data(pdev, &info, sizeof(info));
>  	if (rc < 0) {
> diff --git a/drivers/iommu/intel/dmar.c b/drivers/iommu/intel/dmar.c
> index 683b812c5c47..b1acdaead059 100644
> --- a/drivers/iommu/intel/dmar.c
> +++ b/drivers/iommu/intel/dmar.c
> @@ -473,7 +473,7 @@ static int dmar_parse_one_rhsa(struct
> acpi_dmar_header *header, void *arg)
>  	rhsa = (struct acpi_dmar_rhsa *)header;
>  	for_each_drhd_unit(drhd) {
>  		if (drhd->reg_base_addr == rhsa->base_address) {
> -			int node = acpi_map_pxm_to_node(rhsa->proximity_domain);
> +			int node = pxm_to_node(rhsa->proximity_domain);
> 
>  			if (!node_online(node))
>  				node = NUMA_NO_NODE;
> --
> 2.19.1

Thanks
Barry
diff mbox series

Patch

diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index 28a6b387e80e..eb0f158612c8 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -1293,7 +1293,7 @@  static int  __init arm_smmu_v3_set_proximity(struct device *dev,
 
 	smmu = (struct acpi_iort_smmu_v3 *)node->node_data;
 	if (smmu->flags & ACPI_IORT_SMMU_V3_PXM_VALID) {
-		int dev_node = acpi_map_pxm_to_node(smmu->pxm);
+		int dev_node = pxm_to_node(smmu->pxm);
 
 		if (dev_node != NUMA_NO_NODE && !node_online(dev_node))
 			return -EINVAL;
diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index 7c138a4edc03..d933a4636d00 100644
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -2947,8 +2947,7 @@  static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc,
 	if (spa->flags & ACPI_NFIT_PROXIMITY_VALID) {
 		ndr_desc->numa_node = acpi_map_pxm_to_online_node(
 						spa->proximity_domain);
-		ndr_desc->target_node = acpi_map_pxm_to_node(
-				spa->proximity_domain);
+		ndr_desc->target_node = pxm_to_node(spa->proximity_domain);
 	} else {
 		ndr_desc->numa_node = NUMA_NO_NODE;
 		ndr_desc->target_node = NUMA_NO_NODE;
diff --git a/drivers/acpi/numa/hmat.c b/drivers/acpi/numa/hmat.c
index 2c32cfb72370..cf6df2df26cd 100644
--- a/drivers/acpi/numa/hmat.c
+++ b/drivers/acpi/numa/hmat.c
@@ -666,7 +666,7 @@  static void hmat_register_target_device(struct memory_target *target,
 
 	pdev->dev.numa_node = acpi_map_pxm_to_online_node(target->memory_pxm);
 	info = (struct memregion_info) {
-		.target_node = acpi_map_pxm_to_node(target->memory_pxm),
+		.target_node = pxm_to_node(target->memory_pxm),
 	};
 	rc = platform_device_add_data(pdev, &info, sizeof(info));
 	if (rc < 0) {
diff --git a/drivers/iommu/intel/dmar.c b/drivers/iommu/intel/dmar.c
index 683b812c5c47..b1acdaead059 100644
--- a/drivers/iommu/intel/dmar.c
+++ b/drivers/iommu/intel/dmar.c
@@ -473,7 +473,7 @@  static int dmar_parse_one_rhsa(struct acpi_dmar_header *header, void *arg)
 	rhsa = (struct acpi_dmar_rhsa *)header;
 	for_each_drhd_unit(drhd) {
 		if (drhd->reg_base_addr == rhsa->base_address) {
-			int node = acpi_map_pxm_to_node(rhsa->proximity_domain);
+			int node = pxm_to_node(rhsa->proximity_domain);
 
 			if (!node_online(node))
 				node = NUMA_NO_NODE;