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From: Jonathan Cameron <Jonathan.Cameron@huawei.com>
To: <linux-mm@kvack.org>, <linux-acpi@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>, <x86@kernel.org>,
	Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
	<rafael@kernel.org>, Ingo Molnar <mingo@redhat.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
	<linux-kernel@vger.kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>, <linuxarm@huawei.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Brice Goglin <Brice.Goglin@inria.fr>,
	"Sean V Kelley" <sean.v.kelley@linux.intel.com>,
	<linux-api@vger.kernel.org>, "Hanjun Guo" <guohanjun@huawei.com>,
	Jonathan Cameron <Jonathan.Cameron@huawei.com>
Subject: [PATCH v10 4/6] ACPI: HMAT: Fix handling of changes from ACPI 6.2 to ACPI 6.3
Date: Mon, 7 Sep 2020 22:03:05 +0800	[thread overview]
Message-ID: <20200907140307.571932-5-Jonathan.Cameron@huawei.com> (raw)
In-Reply-To: <20200907140307.571932-1-Jonathan.Cameron@huawei.com>

In ACPI 6.3, the Memory Proximity Domain Attributes Structure
changed substantially.  One of those changes was that the flag
for "Memory Proximity Domain field is valid" was deprecated.

This was because the field "Proximity Domain for the Memory"
became a required field and hence having a validity flag makes
no sense.

So the correct logic is to always assume the field is there.
Current code assumes it never is.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
Changes for v10:
 * Reorder the checks so we confirm the version first before taking the
  ACPI_HMAT_MEMORY_PD_VALID into account.
  (Bjorn Helgaas)

 drivers/acpi/numa/hmat.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/numa/hmat.c b/drivers/acpi/numa/hmat.c
index 2c32cfb72370..6a91a55229ae 100644
--- a/drivers/acpi/numa/hmat.c
+++ b/drivers/acpi/numa/hmat.c
@@ -424,7 +424,8 @@ static int __init hmat_parse_proximity_domain(union acpi_subtable_headers *heade
 		pr_info("HMAT: Memory Flags:%04x Processor Domain:%u Memory Domain:%u\n",
 			p->flags, p->processor_PD, p->memory_PD);
 
-	if (p->flags & ACPI_HMAT_MEMORY_PD_VALID && hmat_revision == 1) {
+	if ((hmat_revision == 1 && p->flags & ACPI_HMAT_MEMORY_PD_VALID) ||
+	    hmat_revision > 1) {
 		target = find_mem_target(p->memory_PD);
 		if (!target) {
 			pr_debug("HMAT: Memory Domain missing from SRAT\n");
-- 
2.19.1


  parent reply	other threads:[~2020-09-07 14:10 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-07 14:03 [PATCH v10 0/6] ACPI: Support Generic Initiator proximity domains Jonathan Cameron
2020-09-07 14:03 ` [PATCH v10 1/6] ACPI: Support Generic Initiator only domains Jonathan Cameron
2020-09-07 14:03 ` [PATCH v10 2/6] x86: Support Generic Initiator only proximity domains Jonathan Cameron
2020-09-23 16:06   ` Borislav Petkov
2020-09-25 11:32     ` Jonathan Cameron
2020-09-25 16:08       ` Borislav Petkov
2020-09-07 14:03 ` [PATCH v10 3/6] ACPI: Let ACPI know we support Generic Initiator Affinity Structures Jonathan Cameron
2020-09-07 14:03 ` Jonathan Cameron [this message]
2020-09-07 14:03 ` [PATCH v10 5/6] node: Add access1 class to represent CPU to memory characteristics Jonathan Cameron
2020-09-07 14:03 ` [PATCH v10 6/6] docs: mm: numaperf.rst Add brief description for access class 1 Jonathan Cameron
2020-09-18 12:17 ` [PATCH v10 0/6] ACPI: Support Generic Initiator proximity domains Jonathan Cameron

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