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Date: Mon, 25 Jun 2007 23:42:22 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: "Keshavamurthy, Anil S" <anil.s.keshavamurthy@...el.com>
Cc: linux-kernel@...r.kernel.org, ak@...e.de, gregkh@...e.de,
muli@...ibm.com, suresh.b.siddha@...el.com, arjan@...ux.intel.com,
ashok.raj@...el.com, davem@...emloft.net, clameter@....com
Subject: Re: [Intel IOMMU 10/10] Iommu floppy workaround
On Tue, 19 Jun 2007 14:37:11 -0700 "Keshavamurthy, Anil S" <anil.s.keshavamurthy@...el.com> wrote:
> This config option (DMAR_FLPY_WA) sets up 1:1 mapping for the
> floppy device so that the floppy device which does not use
> DMA api's will continue to work.
>
> Once the floppy driver starts using DMA api's this config option
> can be turn off or this patch can be yanked out of kernel at that
> time.
>
>
> Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>
> ---
> arch/x86_64/Kconfig | 10 ++++++++++
> drivers/pci/intel-iommu.c | 22 ++++++++++++++++++++++
> drivers/pci/intel-iommu.h | 7 +++++++
> 3 files changed, 39 insertions(+)
>
> Index: linux-2.6.22-rc4-mm2/arch/x86_64/Kconfig
> ===================================================================
> --- linux-2.6.22-rc4-mm2.orig/arch/x86_64/Kconfig 2007-06-18 15:45:08.000000000 -0700
> +++ linux-2.6.22-rc4-mm2/arch/x86_64/Kconfig 2007-06-18 15:45:09.000000000 -0700
> @@ -752,6 +752,16 @@
> all the OS visible memory. Hence the driver can continue
> to use physical addresses for DMA.
>
> +config DMAR_FLPY_WA
FLOPPY is spelled "FLOPPY"!
> ===================================================================
> --- linux-2.6.22-rc4-mm2.orig/drivers/pci/intel-iommu.c 2007-06-18 15:45:08.000000000 -0700
> +++ linux-2.6.22-rc4-mm2/drivers/pci/intel-iommu.c 2007-06-18 15:45:09.000000000 -0700
> @@ -1631,6 +1631,26 @@
> }
> #endif
>
> +#ifdef CONFIG_DMAR_FLPY_WA
> +static inline void iommu_prepare_isa(void)
> +{
> + struct pci_dev *pdev = NULL;
> + int ret;
> +
> + pdev = pci_get_class (PCI_CLASS_BRIDGE_ISA << 8, NULL);
> + if (!pdev)
> + return;
> +
> + printk (KERN_INFO "IOMMU: Prepare 0-16M unity mapping for LPC\n");
> + ret = iommu_prepare_identity_map(pdev, 0, 16*1024*1024);
> +
> + if (ret)
> + printk ("IOMMU: Failed to create 0-64M identity map, \
> + Floppy might not work\n");
> +
> +}
> +#endif
> +
> int __init init_dmars(void)
> {
> struct dmar_drhd_unit *drhd;
> @@ -1696,6 +1716,8 @@
>
> iommu_prepare_gfx_mapping();
>
> + iommu_prepare_isa();
> +
> /*
> * for each drhd
> * enable fault log
> Index: linux-2.6.22-rc4-mm2/drivers/pci/intel-iommu.h
> ===================================================================
> --- linux-2.6.22-rc4-mm2.orig/drivers/pci/intel-iommu.h 2007-06-18 15:45:08.000000000 -0700
> +++ linux-2.6.22-rc4-mm2/drivers/pci/intel-iommu.h 2007-06-18 15:45:09.000000000 -0700
> @@ -322,4 +322,11 @@
> }
> #endif /* !CONFIG_DMAR_GFX_WA */
>
> +#ifndef CONFIG_DMAR_FLPY_WA
> +static inline void iommu_prepare_isa(void)
> +{
> + return;
> +}
> +#endif /* !CONFIG_DMAR_FLPY_WA */
Bit weird that this was implemented in the header like that.
How about this? (Also contains rather a lot of obvious style fixes)
arch/x86_64/Kconfig | 2 +-
drivers/pci/intel-iommu.c | 19 ++++++++++++-------
drivers/pci/intel-iommu.h | 7 -------
3 files changed, 13 insertions(+), 15 deletions(-)
diff -puN arch/x86_64/Kconfig~intel-iommu-iommu-floppy-workaround-fix arch/x86_64/Kconfig
--- a/arch/x86_64/Kconfig~intel-iommu-iommu-floppy-workaround-fix
+++ a/arch/x86_64/Kconfig
@@ -770,7 +770,7 @@ config DMAR_GFX_WA
all the OS visible memory. Hence the driver can continue
to use physical addresses for DMA.
-config DMAR_FLPY_WA
+config DMAR_FLOPPY_WA
bool "Support for Floppy disk workaround"
depends on DMAR
default y
diff -puN drivers/pci/intel-iommu.c~intel-iommu-iommu-floppy-workaround-fix drivers/pci/intel-iommu.c
--- a/drivers/pci/intel-iommu.c~intel-iommu-iommu-floppy-workaround-fix
+++ a/drivers/pci/intel-iommu.c
@@ -1631,25 +1631,30 @@ error:
}
#endif
-#ifdef CONFIG_DMAR_FLPY_WA
+#ifdef CONFIG_DMAR_FLOPPY_WA
static inline void iommu_prepare_isa(void)
{
- struct pci_dev *pdev = NULL;
+ struct pci_dev *pdev;
int ret;
- pdev = pci_get_class (PCI_CLASS_BRIDGE_ISA << 8, NULL);
+ pdev = pci_get_class(PCI_CLASS_BRIDGE_ISA << 8, NULL);
if (!pdev)
return;
- printk (KERN_INFO "IOMMU: Prepare 0-16M unity mapping for LPC\n");
+ printk(KERN_INFO "IOMMU: Prepare 0-16M unity mapping for LPC\n");
ret = iommu_prepare_identity_map(pdev, 0, 16*1024*1024);
if (ret)
- printk ("IOMMU: Failed to create 0-64M identity map, \
- Floppy might not work\n");
+ printk("IOMMU: Failed to create 0-64M identity map, "
+ "floppy might not work\n");
}
-#endif
+#else
+static inline void iommu_prepare_isa(void)
+{
+ return;
+}
+#endif /* !CONFIG_DMAR_FLPY_WA */
int __init init_dmars(void)
{
diff -puN drivers/pci/intel-iommu.h~intel-iommu-iommu-floppy-workaround-fix drivers/pci/intel-iommu.h
--- a/drivers/pci/intel-iommu.h~intel-iommu-iommu-floppy-workaround-fix
+++ a/drivers/pci/intel-iommu.h
@@ -322,11 +322,4 @@ static inline void iommu_prepare_gfx_map
}
#endif /* !CONFIG_DMAR_GFX_WA */
-#ifndef CONFIG_DMAR_FLPY_WA
-static inline void iommu_prepare_isa(void)
-{
- return;
-}
-#endif /* !CONFIG_DMAR_FLPY_WA */
-
#endif
_
-
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