Re: [SeaBIOS] [PATCH 3/4] iommu: introduce AMD IOMMU support, initialize it

[Isaku Yamahata <yamahata@valinux.co.jp>]

I think those global variables are unnecessary.
Please see the comment on 4/4.

thanks,

On Sat, Aug 28, 2010 at 06:02:57PM +0300, Eduard - Gabriel Munteanu wrote:
> The AMD IOMMU must be discovered and initialized by the BIOS if present.
> 
> Signed-off-by: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
> ---
>  Makefile       |    2 +-
>  src/iommu.c    |   63 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  src/iommu.h    |   12 ++++++++++
>  src/pci_ids.h  |    1 +
>  src/pci_regs.h |    1 +
>  src/pciinit.c  |   15 +++++++++++++
>  6 files changed, 93 insertions(+), 1 deletions(-)
>  create mode 100644 src/iommu.c
>  create mode 100644 src/iommu.h
> 
> diff --git a/Makefile b/Makefile
> index 47f5625..cee286a 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -15,7 +15,7 @@ SRCBOTH=misc.c pmm.c stacks.c output.c util.c block.c floppy.c ata.c mouse.c \
>          kbd.c pci.c serial.c clock.c pic.c cdrom.c ps2port.c smp.c resume.c \
>          pnpbios.c pirtable.c vgahooks.c ramdisk.c pcibios.c blockcmd.c \
>          usb.c usb-uhci.c usb-ohci.c usb-ehci.c usb-hid.c usb-msc.c \
> -        virtio-ring.c virtio-pci.c virtio-blk.c
> +        virtio-ring.c virtio-pci.c virtio-blk.c iommu.c
>  SRC16=$(SRCBOTH) system.c disk.c apm.c font.c
>  SRC32FLAT=$(SRCBOTH) post.c shadow.c memmap.c coreboot.c boot.c \
>        acpi.c smm.c mptable.c smbios.c pciinit.c optionroms.c mtrr.c \
> diff --git a/src/iommu.c b/src/iommu.c
> new file mode 100644
> index 0000000..4ff62fc
> --- /dev/null
> +++ b/src/iommu.c
> @@ -0,0 +1,63 @@
> +// AMD IOMMU initialization code.
> +//
> +// Copyright (C) 2010  Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
> +//
> +// This file may be distributed under the terms of the GNU LGPLv3 license.
> +
> +#include "iommu.h"
> +#include "pci.h"
> +#include "types.h"
> +
> +#define IOMMU_CAP_BAR_LOW       0x04
> +#define IOMMU_CAP_BAR_HIGH      0x08
> +#define IOMMU_CAP_RANGE         0x0C
> +#define IOMMU_CAP_MISC          0x10
> +
> +static int iommu_bdf = -1;
> +static u8 iommu_cap_offset;
> +static u32 iommu_base;
> +
> +void iommu_init(int bdf, u32 base)
> +{
> +    u8 ptr, cap, type;
> +
> +    /* Only one IOMMU is supported. */
> +    if (iommu_bdf >= 0)
> +        return;
> +
> +    foreachcap(bdf, ptr, cap) {
> +        type = pci_config_readb(bdf, cap);
> +        if (type == PCI_CAP_ID_SEC)
> +            break;
> +    }
> +    if (!cap)
> +        return;
> +
> +    pci_config_writel(bdf, cap + IOMMU_CAP_RANGE, 0);
> +    pci_config_writel(bdf, cap + IOMMU_CAP_BAR_HIGH, 0);
> +    pci_config_writel(bdf, cap + IOMMU_CAP_BAR_LOW, base | 1);
> +
> +    iommu_bdf = bdf;
> +    iommu_cap_offset = cap;
> +    iommu_base = base;
> +}
> +
> +int iommu_get_bdf(void)
> +{
> +    return iommu_bdf;
> +}
> +
> +u8 iommu_get_cap_offset(void)
> +{
> +    return iommu_cap_offset;
> +}
> +
> +u32 iommu_get_misc(void)
> +{
> +    return pci_config_readw(iommu_bdf, iommu_cap_offset + IOMMU_CAP_MISC + 2);
> +}
> +
> +u32 iommu_get_base(void)
> +{
> +    return iommu_base;
> +}
> diff --git a/src/iommu.h b/src/iommu.h
> new file mode 100644
> index 0000000..27ae2c7
> --- /dev/null
> +++ b/src/iommu.h
> @@ -0,0 +1,12 @@
> +#ifndef __IOMMU_H
> +#define __IOMMU_H
> +
> +#include "types.h"
> +
> +void iommu_init(int bdf, u32 base);
> +int iommu_get_bdf(void);
> +u8 iommu_get_cap_offset(void);
> +u32 iommu_get_misc(void);
> +u32 iommu_get_base(void);
> +
> +#endif // __IOMMU_H
> diff --git a/src/pci_ids.h b/src/pci_ids.h
> index 441c086..6876fbe 100644
> --- a/src/pci_ids.h
> +++ b/src/pci_ids.h
> @@ -72,6 +72,7 @@
>  #define PCI_CLASS_SYSTEM_RTC            0x0803
>  #define PCI_CLASS_SYSTEM_PCI_HOTPLUG    0x0804
>  #define PCI_CLASS_SYSTEM_SDHCI          0x0805
> +#define PCI_CLASS_SYSTEM_IOMMU          0x0806
>  #define PCI_CLASS_SYSTEM_OTHER          0x0880
>  
>  #define PCI_BASE_CLASS_INPUT            0x09
> diff --git a/src/pci_regs.h b/src/pci_regs.h
> index e6180ce..46b048f 100644
> --- a/src/pci_regs.h
> +++ b/src/pci_regs.h
> @@ -208,6 +208,7 @@
>  #define  PCI_CAP_ID_SHPC        0x0C    /* PCI Standard Hot-Plug Controller */
>  #define  PCI_CAP_ID_SSVID       0x0D    /* Bridge subsystem vendor/device ID */
>  #define  PCI_CAP_ID_AGP3        0x0E    /* AGP Target PCI-PCI bridge */
> +#define  PCI_CAP_ID_SEC         0x0F    /* Secure Device (AMD IOMMU) */
>  #define  PCI_CAP_ID_EXP         0x10    /* PCI Express */
>  #define  PCI_CAP_ID_MSIX        0x11    /* MSI-X */
>  #define PCI_CAP_LIST_NEXT       1       /* Next capability in the list */
> diff --git a/src/pciinit.c b/src/pciinit.c
> index f75e552..7cb67c6 100644
> --- a/src/pciinit.c
> +++ b/src/pciinit.c
> @@ -11,6 +11,7 @@
>  #include "pci_ids.h" // PCI_VENDOR_ID_INTEL
>  #include "pci_regs.h" // PCI_COMMAND
>  #include "dev-i440fx.h"
> +#include "iommu.h"
>  
>  #define PCI_ROM_SLOT 6
>  #define PCI_NUM_REGIONS 7
> @@ -262,6 +263,16 @@ static void apple_macio_init(u16 bdf, void *arg)
>      pci_set_io_region_addr(bdf, 0, 0x80800000);
>  }
>  
> +static void pci_bios_init_iommu(u16 bdf, void *arg)
> +{
> +    u32 base;
> +
> +    base = ALIGN(pci_bios_mem_addr, 0x4000);
> +    pci_bios_mem_addr += 0x4000;
> +
> +    iommu_init(bdf, base);
> +}
> +
>  static const struct pci_device_id pci_class_tbl[] = {
>      /* STORAGE IDE */
>      PCI_DEVICE_CLASS(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371SB_1,
> @@ -285,6 +296,10 @@ static const struct pci_device_id pci_class_tbl[] = {
>      PCI_DEVICE_CLASS(PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_BRIDGE_PCI,
>                       pci_bios_init_device_bridge),
>  
> +    /* AMD IOMMU */
> +    PCI_DEVICE_CLASS(PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_SYSTEM_IOMMU,
> +                     pci_bios_init_iommu),
> +
>      /* default */
>      PCI_DEVICE(PCI_ANY_ID, PCI_ANY_ID, pci_bios_allocate_regions),
>  
> -- 
> 1.7.1
> 
> 
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> 

-- 
yamahata