linux-kernel - Re: [PATCH v2] IA64 Compilation Error Fix for Intel IOMMU Identity Mapping Support

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Message-ID: <20090627000347.GH6729@sequoia.sous-sol.org>
Date:	Fri, 26 Jun 2009 17:03:47 -0700
From:	Chris Wright <chrisw@...s-sol.org>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	Chris Wright <chrisw@...hat.com>, tony.luck@...el.com,
	linux-ia64@...r.kernel.org, linux-kernel@...r.kernel.org,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	iommu@...ts.linux-foundation.org, akpm@...ux-foundation.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH v2] IA64 Compilation Error Fix for Intel IOMMU Identity
	Mapping Support

* David Woodhouse (dwmw2@...radead.org) wrote:
> On Thu, 25 Jun 2009, Chris Wright wrote:
> 
> > * Linus Torvalds (torvalds@...ux-foundation.org) wrote:
> >> Ok. Sounds like what I want is to get this patch through the ia64 people,
> >> after it has gotten some testing there. Since ia64 is where the current
> >> kernel fails anyway, that sounds like the motivation will be there too.
> >
> > Yup, I agree.
> 
> Tony, please could you test what's in git://git.infradead.org/iommu-2.6.git
> 
> It builds, but we'd like to check that it works correctly with iommu=pt on 
> IA64.

In the meantime, I booted this on an IA-64 box (w/out VT-d), forced it
to call intel_iommu_init() as if it had an IOMMU, and added a small bit
of debugging.  Looks like it's doing the right thing.

efi based
e000000001000000-e000000078000000
e00000007c000000-e00000007e990000
e00000007f300000-e00000007fda0000
e000000100000000-e00000047b7f0000
e00000047f800000-e00000047fdc0000
e00000047fe80000-e00000047ffb0000
zone based
1000000-100000000
100000000-47ffb0000
online node based
1000000-78000000
7c000000-7e990000
7f300000-7fda0000
100000000-47b7f0000
47f800000-47fdc0000
47fe80000-47ffb0000

The efi based mem walker is returning virtual addresses, Fenghua did
you test that one?  I'm surprised it worked.

This is quite similar to the type of output I see on x86_64 (except the
e820 map gives phys addrs, of course).

e820 based
10000-9d800
100000-bf341000
bf67e000-bf800000
100000000-340000000
zone based
10000-1000000
1000000-100000000
100000000-1c0000000
1c0000000-340000000
online node based
10000-9d000
100000-bf341000
bf67e000-bf800000
100000000-1c0000000
1c0000000-340000000

thanks,
-chris
---
debug patch for the really bored...

Index: linus-2.6/drivers/pci/intel-iommu.c
===================================================================
--- linus-2.6.orig/drivers/pci/intel-iommu.c
+++ linus-2.6/drivers/pci/intel-iommu.c
@@ -3110,10 +3110,66 @@ static int __init init_iommu_sysfs(void)
 }
 #endif	/* CONFIG_PM */
 
+#ifdef CONFIG_X86
+#include <asm/e820.h>
+static void __init print_memmap(void)
+{
+	int i;
+	printk("e820 based\n");
+	for (i = 0; i < e820.nr_map; i++) {
+		struct e820entry *ei = &e820.map[i];
+
+		if (ei->type == E820_RAM)
+			printk("%llx-%llx\n", ei->addr, ei->addr + ei->size);
+	}
+}
+#elif CONFIG_IA64
+#include <linux/efi.h>
+static int __init efi_print_map(u64 start, u64 end, void *unused)
+{
+	printk("%llx-%llx\n", start, end);
+	return 0;
+}
+
+static void __init print_memmap(void)
+{
+	printk("efi based\n");
+	efi_memmap_walk(efi_print_map, NULL);
+}
+#endif
+
+static int __init print_region(unsigned long start_pfn, unsigned long end_pfn,
+			       void *unused)
+{
+	printk("%lx-%lx\n", start_pfn << PAGE_SHIFT, end_pfn << PAGE_SHIFT);
+	return 0;
+}
+
+static void __init show_mem_regions(void)
+{
+	int  nid;
+	struct zone *zone;
+
+	print_memmap();
+	printk("zone based\n");
+	for_each_populated_zone(zone) {
+		unsigned long zone_end_pfn = zone->zone_start_pfn +
+					     zone->spanned_pages;
+		printk("%lx-%lx\n", zone->zone_start_pfn << PAGE_SHIFT,
+				    zone_end_pfn << PAGE_SHIFT);
+	}
+
+	printk("online node based\n");
+	for_each_online_node(nid)
+		work_with_active_regions(nid, print_region, NULL);
+}
+
 int __init intel_iommu_init(void)
 {
 	int ret = 0;
 
+	show_mem_regions();
+
 	if (dmar_table_init())
 		return 	-ENODEV;
 
Index: linus-2.6/arch/ia64/kernel/pci-dma.c
===================================================================
--- linus-2.6.orig/arch/ia64/kernel/pci-dma.c
+++ linus-2.6/arch/ia64/kernel/pci-dma.c
@@ -47,7 +47,7 @@ extern struct dma_map_ops intel_dma_ops;
 
 static int __init pci_iommu_init(void)
 {
-	if (iommu_detected)
+//	if (iommu_detected)
 		intel_iommu_init();
 
 	return 0;
--
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