linux-kernel - [PATCH 03/16] iommu/amd: Allocate data structures to keep track of irq remapping tables

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1348835046-3262-4-git-send-email-joerg.roedel@amd.com>
Date:	Fri, 28 Sep 2012 14:23:53 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	<iommu@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>
CC:	Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH 03/16] iommu/amd: Allocate data structures to keep track of irq remapping tables

To easily map device ids to interrupt remapping table
entries a new lookup table is necessary.

Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 drivers/iommu/amd_iommu_init.c  |   16 ++++++++++++++++
 drivers/iommu/amd_iommu_types.h |    9 +++++++++
 2 files changed, 25 insertions(+)

diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index a046a0e..db100c5 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -181,6 +181,12 @@ u16 *amd_iommu_alias_table;
 struct amd_iommu **amd_iommu_rlookup_table;
 
 /*
+ * This table is used to find the irq remapping table for a given device id
+ * quickly.
+ */
+struct irq_remap_table **irq_lookup_table;
+
+/*
  * AMD IOMMU allows up to 2^16 differend protection domains. This is a bitmap
  * to know which ones are already in use.
  */
@@ -1529,9 +1535,13 @@ static struct syscore_ops amd_iommu_syscore_ops = {
 
 static void __init free_on_init_error(void)
 {
+	free_pages((unsigned long)irq_lookup_table,
+		   get_order(rlookup_table_size));
+
 	if (amd_iommu_irq_cache) {
 		kmem_cache_destroy(amd_iommu_irq_cache);
 		amd_iommu_irq_cache = NULL;
+
 	}
 
 	amd_iommu_uninit_devices();
@@ -1684,6 +1694,12 @@ static int __init early_amd_iommu_init(void)
 				0, NULL);
 		if (!amd_iommu_irq_cache)
 			goto out;
+
+		irq_lookup_table = (void *)__get_free_pages(
+				GFP_KERNEL | __GFP_ZERO,
+				get_order(rlookup_table_size));
+		if (!irq_lookup_table)
+			goto out;
 	}
 
 	ret = init_memory_definitions(ivrs_base);
diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h
index 953cea8..1a7d480 100644
--- a/drivers/iommu/amd_iommu_types.h
+++ b/drivers/iommu/amd_iommu_types.h
@@ -175,6 +175,7 @@
 #define DEV_ENTRY_EX            0x67
 #define DEV_ENTRY_SYSMGT1       0x68
 #define DEV_ENTRY_SYSMGT2       0x69
+#define DEV_ENTRY_IRQ_TBL_EN	0x80
 #define DEV_ENTRY_INIT_PASS     0xb8
 #define DEV_ENTRY_EINT_PASS     0xb9
 #define DEV_ENTRY_NMI_PASS      0xba
@@ -337,6 +338,14 @@ extern bool amd_iommu_iotlb_sup;
 #define MAX_IRQS_PER_TABLE	256
 #define IRQ_TABLE_ALIGNMENT	128
 
+struct irq_remap_table {
+	spinlock_t lock;
+	unsigned min_index;
+	u32 *table;
+};
+
+extern struct irq_remap_table **irq_lookup_table;
+
 /* Interrupt remapping feature used? */
 extern bool amd_iommu_irq_remap;
 
-- 
1.7.9.5


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/