public inbox for linux-kernel@vger.kernel.org
 help / color / mirror / Atom feed
From: Suresh Siddha <suresh.b.siddha@intel.com>
To: mingo@elte.hu, hpa@zytor.com, tglx@linutronix.de
Cc: linux-kernel@vger.kernel.org, dwmw2@infradead.org,
	Yinghai Lu <yhlu.kernel@gmail.com>,
	Suresh Siddha <suresh.b.siddha@intel.com>
Subject: [patch 2/5] dmar: fix using early fixmap mapping for DMAR table parsing
Date: Wed, 03 Sep 2008 16:58:32 -0700	[thread overview]
Message-ID: <20080904000237.895621000@linux-os.sc.intel.com> (raw)
In-Reply-To: 20080904000237.746216000@linux-os.sc.intel.com

[-- Attachment #1: dmar_fix_fixmap_mapping.patch --]
[-- Type: text/plain, Size: 3011 bytes --]

From: Yinghai Lu <yhlu.kernel@gmail.com>
Subject: dmar: fix using early fixmap mapping for DMAR table parsing

Very early detection of the DMAR tables will setup fixmap mapping. For
parsing these tables later (while enabling dma and/or interrupt remapping),
early fixmap mapping shouldn't be used. Fix it by calling table detection
routines again, which will call generic apci_get_table() for setting up
the correct mapping.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
---

Index: tip/drivers/pci/dmar.c
===================================================================
--- tip.orig/drivers/pci/dmar.c	2008-09-02 16:04:04.000000000 -0700
+++ tip/drivers/pci/dmar.c	2008-09-02 16:41:31.000000000 -0700
@@ -289,6 +289,24 @@
 	}
 }
 
+/**
+ * dmar_table_detect - checks to see if the platform supports DMAR devices
+ */
+static int __init dmar_table_detect(void)
+{
+	acpi_status status = AE_OK;
+
+	/* if we could find DMAR table, then there are DMAR devices */
+	status = acpi_get_table(ACPI_SIG_DMAR, 0,
+				(struct acpi_table_header **)&dmar_tbl);
+
+	if (ACPI_SUCCESS(status) && !dmar_tbl) {
+		printk (KERN_WARNING PREFIX "Unable to map DMAR\n");
+		status = AE_NOT_FOUND;
+	}
+
+	return (ACPI_SUCCESS(status) ? 1 : 0);
+}
 
 /**
  * parse_dmar_table - parses the DMA reporting table
@@ -300,6 +318,12 @@
 	struct acpi_dmar_header *entry_header;
 	int ret = 0;
 
+	/*
+	 * Do it again, earlier dmar_tbl mapping could be mapped with
+	 * fixed map.
+	 */
+	dmar_table_detect();
+
 	dmar = (struct acpi_table_dmar *)dmar_tbl;
 	if (!dmar)
 		return -ENODEV;
@@ -430,30 +454,11 @@
 	return 0;
 }
 
-/**
- * early_dmar_detect - checks to see if the platform supports DMAR devices
- */
-int __init early_dmar_detect(void)
-{
-	acpi_status status = AE_OK;
-
-	/* if we could find DMAR table, then there are DMAR devices */
-	status = acpi_get_table(ACPI_SIG_DMAR, 0,
-				(struct acpi_table_header **)&dmar_tbl);
-
-	if (ACPI_SUCCESS(status) && !dmar_tbl) {
-		printk (KERN_WARNING PREFIX "Unable to map DMAR\n");
-		status = AE_NOT_FOUND;
-	}
-
-	return (ACPI_SUCCESS(status) ? 1 : 0);
-}
-
 void __init detect_intel_iommu(void)
 {
 	int ret;
 
-	ret = early_dmar_detect();
+	ret = dmar_table_detect();
 
 #ifdef CONFIG_DMAR
 	{
@@ -479,14 +484,16 @@
 			       " x2apic support\n");
 
 			dmar_disabled = 1;
-			return;
+			goto end;
 		}
 
 		if (ret && !no_iommu && !iommu_detected && !swiotlb &&
 		    !dmar_disabled)
 			iommu_detected = 1;
 	}
+end:
 #endif
+	dmar_tbl = NULL;
 }
 
 
Index: tip/include/linux/dmar.h
===================================================================
--- tip.orig/include/linux/dmar.h	2008-09-02 16:04:04.000000000 -0700
+++ tip/include/linux/dmar.h	2008-09-02 16:40:40.000000000 -0700
@@ -45,7 +45,6 @@
 	list_for_each_entry(drhd, &dmar_drhd_units, list)
 
 extern int dmar_table_init(void);
-extern int early_dmar_detect(void);
 extern int dmar_dev_scope_init(void);
 
 /* Intel IOMMU detection */

-- 


  reply	other threads:[~2008-09-04  0:09 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-09-03 23:58 [patch 1/5] x2apic: fix reserved APIC register accesses in print_local_APIC() Suresh Siddha
2008-09-03 23:58 ` Suresh Siddha [this message]
2008-09-03 23:58 ` [patch 3/5] dmar: initialize the return value in dmar_parse_dev() Suresh Siddha
2008-09-03 23:58 ` [patch 4/5] dmar: use list_for_each_entry_safe() in dmar_dev_scope_init() Suresh Siddha
2008-09-03 23:58 ` [patch 5/5] dmar: fix dmar_parse_dev() devices_cnt error condition check Suresh Siddha
2008-09-04 11:06 ` [patch 1/5] x2apic: fix reserved APIC register accesses in print_local_APIC() Ingo Molnar
2008-09-04 17:51   ` Suresh Siddha
2008-09-05  8:10     ` Ingo Molnar
2008-09-05  9:18       ` Jesse Barnes

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=20080904000237.895621000@linux-os.sc.intel.com \
    --to=suresh.b.siddha@intel.com \
    --cc=dwmw2@infradead.org \
    --cc=hpa@zytor.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mingo@elte.hu \
    --cc=tglx@linutronix.de \
    --cc=yhlu.kernel@gmail.com \
    /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