linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
To: linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org
Cc: joro@8bytes.org, will@kernel.org, jsnitsel@redhat.com,
	Jon.Grimm@amd.com, thomas.lendacky@amd.com,
	Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Subject: [PATCH] iommu/amd: Add sanity check for interrupt remapping table length macros
Date: Thu, 10 Dec 2020 10:24:36 -0600	[thread overview]
Message-ID: <20201210162436.126321-1-suravee.suthikulpanit@amd.com> (raw)

Currently, macros related to the interrupt remapping table length are
defined separately. This has resulted in an oversight in which one of
the macros were missed when changing the length. To prevent this,
redefine the macros to add built-in sanity check.

Also, rename macros to use the name of the DTE[IntTabLen] field as
specified in the AMD IOMMU specification. There is no functional change.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Cc: Will Deacon <will@kernel.org>
Cc: Jerry Snitselaar <jsnitsel@redhat.com>
Cc: Joerg Roedel <joro@8bytes.org>
---
 drivers/iommu/amd/amd_iommu_types.h | 19 ++++++++++---------
 drivers/iommu/amd/init.c            |  6 +++---
 drivers/iommu/amd/iommu.c           |  2 +-
 3 files changed, 14 insertions(+), 13 deletions(-)

diff --git a/drivers/iommu/amd/amd_iommu_types.h b/drivers/iommu/amd/amd_iommu_types.h
index 494b42a31b7a..899ce62df3f0 100644
--- a/drivers/iommu/amd/amd_iommu_types.h
+++ b/drivers/iommu/amd/amd_iommu_types.h
@@ -255,11 +255,19 @@
 /* Bit value definition for dte irq remapping fields*/
 #define DTE_IRQ_PHYS_ADDR_MASK	(((1ULL << 45)-1) << 6)
 #define DTE_IRQ_REMAP_INTCTL_MASK	(0x3ULL << 60)
-#define DTE_IRQ_TABLE_LEN_MASK	(0xfULL << 1)
 #define DTE_IRQ_REMAP_INTCTL    (2ULL << 60)
-#define DTE_IRQ_TABLE_LEN       (9ULL << 1)
 #define DTE_IRQ_REMAP_ENABLE    1ULL
 
+/*
+ * AMD IOMMU hardware only support 512 IRTEs despite
+ * the architectural limitation of 2048 entries.
+ */
+#define DTE_INTTAB_ALIGNMENT    128
+#define DTE_INTTABLEN_VALUE     9ULL
+#define DTE_INTTABLEN           (DTE_INTTABLEN_VALUE << 1)
+#define DTE_INTTABLEN_MASK      (0xfULL << 1)
+#define MAX_IRQS_PER_TABLE      (1 << DTE_INTTABLEN_VALUE)
+
 #define PAGE_MODE_NONE    0x00
 #define PAGE_MODE_1_LEVEL 0x01
 #define PAGE_MODE_2_LEVEL 0x02
@@ -409,13 +417,6 @@ extern bool amd_iommu_np_cache;
 /* Only true if all IOMMUs support device IOTLBs */
 extern bool amd_iommu_iotlb_sup;
 
-/*
- * AMD IOMMU hardware only support 512 IRTEs despite
- * the architectural limitation of 2048 entries.
- */
-#define MAX_IRQS_PER_TABLE	512
-#define IRQ_TABLE_ALIGNMENT	128
-
 struct irq_remap_table {
 	raw_spinlock_t lock;
 	unsigned min_index;
diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index 23a790f8f550..6bec8913d064 100644
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -989,10 +989,10 @@ static bool copy_device_table(void)
 
 		irq_v = old_devtb[devid].data[2] & DTE_IRQ_REMAP_ENABLE;
 		int_ctl = old_devtb[devid].data[2] & DTE_IRQ_REMAP_INTCTL_MASK;
-		int_tab_len = old_devtb[devid].data[2] & DTE_IRQ_TABLE_LEN_MASK;
+		int_tab_len = old_devtb[devid].data[2] & DTE_INTTABLEN_MASK;
 		if (irq_v && (int_ctl || int_tab_len)) {
 			if ((int_ctl != DTE_IRQ_REMAP_INTCTL) ||
-			    (int_tab_len != DTE_IRQ_TABLE_LEN)) {
+			    (int_tab_len != DTE_INTTABLEN)) {
 				pr_err("Wrong old irq remapping flag: %#x\n", devid);
 				return false;
 			}
@@ -2674,7 +2674,7 @@ static int __init early_amd_iommu_init(void)
 			remap_cache_sz = MAX_IRQS_PER_TABLE * (sizeof(u64) * 2);
 		amd_iommu_irq_cache = kmem_cache_create("irq_remap_cache",
 							remap_cache_sz,
-							IRQ_TABLE_ALIGNMENT,
+							DTE_INTTAB_ALIGNMENT,
 							0, NULL);
 		if (!amd_iommu_irq_cache)
 			goto out;
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index b9cf59443843..f7abf16d1e3a 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -3191,7 +3191,7 @@ static void set_dte_irq_entry(u16 devid, struct irq_remap_table *table)
 	dte	&= ~DTE_IRQ_PHYS_ADDR_MASK;
 	dte	|= iommu_virt_to_phys(table->table);
 	dte	|= DTE_IRQ_REMAP_INTCTL;
-	dte	|= DTE_IRQ_TABLE_LEN;
+	dte	|= DTE_INTTABLEN;
 	dte	|= DTE_IRQ_REMAP_ENABLE;
 
 	amd_iommu_dev_table[devid].data[2] = dte;
-- 
2.17.1


             reply	other threads:[~2020-12-10 16:23 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-10 16:24 Suravee Suthikulpanit [this message]
2020-12-10 17:29 ` [PATCH] iommu/amd: Add sanity check for interrupt remapping table length macros Jerry Snitselaar
2020-12-11 13:10 ` Will Deacon

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20201210162436.126321-1-suravee.suthikulpanit@amd.com \
    --to=suravee.suthikulpanit@amd.com \
    --cc=Jon.Grimm@amd.com \
    --cc=iommu@lists.linux-foundation.org \
    --cc=joro@8bytes.org \
    --cc=jsnitsel@redhat.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=thomas.lendacky@amd.com \
    --cc=will@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).