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    Subject[PATCH 1/4] PCI legacy I/O port free driver (take4) - Add no_ioport flag into pci_dev
    This patch adds the no_ioport field into struct pci_dev, which is used
    to tell the kernel not to touch any I/O port regions.

    Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>

    drivers/pci/pci.c | 39 ++++++++++++++++++++++++++++++++-------
    include/linux/pci.h | 1 +
    2 files changed, 33 insertions(+), 7 deletions(-)

    Index: linux-2.6.16-rc5-mm1/include/linux/pci.h
    ===================================================================
    --- linux-2.6.16-rc5-mm1.orig/include/linux/pci.h 2006-03-01 13:56:06.000000000 +0900
    +++ linux-2.6.16-rc5-mm1/include/linux/pci.h 2006-03-01 16:30:56.000000000 +0900
    @@ -163,6 +163,7 @@
    unsigned int is_busmaster:1; /* device is busmaster */
    unsigned int no_msi:1; /* device may not use msi */
    unsigned int block_ucfg_access:1; /* userspace config space access is blocked */
    + unsigned int no_ioport:1; /* device may not use ioport */

    u32 saved_config_space[16]; /* config space saved at suspend time */
    struct hlist_head saved_cap_space;
    Index: linux-2.6.16-rc5-mm1/drivers/pci/pci.c
    ===================================================================
    --- linux-2.6.16-rc5-mm1.orig/drivers/pci/pci.c 2006-03-01 13:56:04.000000000 +0900
    +++ linux-2.6.16-rc5-mm1/drivers/pci/pci.c 2006-03-01 16:35:00.000000000 +0900
    @@ -507,7 +507,14 @@
    int
    pci_enable_device(struct pci_dev *dev)
    {
    - int err = pci_enable_device_bars(dev, (1 << PCI_NUM_RESOURCES) - 1);
    + int i, err, bars = (1 << PCI_NUM_RESOURCES) - 1;
    +
    + if (dev->no_ioport)
    + for (i = 0; i < PCI_NUM_RESOURCES; i++)
    + if (pci_resource_flags(dev, i) & IORESOURCE_IO)
    + bars &= ~(1 << i);
    +
    + err = pci_enable_device_bars(dev, bars);
    if (err)
    return err;
    pci_fixup_device(pci_fixup_enable, dev);
    @@ -628,9 +635,14 @@
    {
    if (pci_resource_len(pdev, bar) == 0)
    return;
    - if (pci_resource_flags(pdev, bar) & IORESOURCE_IO)
    + if (pci_resource_flags(pdev, bar) & IORESOURCE_IO) {
    + if (pdev->no_ioport)
    + dev_warn(&pdev->dev,
    + "Trying to release PCI I/O region #%d for "
    + "the device marked I/O resource free\n", bar);
    release_region(pci_resource_start(pdev, bar),
    pci_resource_len(pdev, bar));
    + }
    else if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM)
    release_mem_region(pci_resource_start(pdev, bar),
    pci_resource_len(pdev, bar));
    @@ -656,6 +668,10 @@
    return 0;

    if (pci_resource_flags(pdev, bar) & IORESOURCE_IO) {
    + if (pdev->no_ioport)
    + dev_warn(&pdev->dev,
    + "Trying to request PCI I/O region #%d for "
    + "the device marked I/O resource free\n", bar);
    if (!request_region(pci_resource_start(pdev, bar),
    pci_resource_len(pdev, bar), res_name))
    goto err_out;
    @@ -689,10 +705,13 @@

    void pci_release_regions(struct pci_dev *pdev)
    {
    - int i;
    + int i, no_ioport = pdev->no_ioport;

    - for (i = 0; i < 6; i++)
    + for (i = 0; i < 6; i++) {
    + if (no_ioport && (pci_resource_flags(pdev, i) & IORESOURCE_IO))
    + continue;
    pci_release_region(pdev, i);
    + }
    }

    /**
    @@ -710,16 +729,22 @@
    */
    int pci_request_regions(struct pci_dev *pdev, char *res_name)
    {
    - int i;
    + int i, no_ioport = pdev->no_ioport;

    - for (i = 0; i < 6; i++)
    + for (i = 0; i < 6; i++) {
    + if (no_ioport && (pci_resource_flags(pdev, i) & IORESOURCE_IO))
    + continue;
    if(pci_request_region(pdev, i, res_name))
    goto err_out;
    + }
    return 0;

    err_out:
    - while(--i >= 0)
    + while(--i >= 0) {
    + if (no_ioport && (pci_resource_flags(pdev, i) & IORESOURCE_IO))
    + continue;
    pci_release_region(pdev, i);
    + }

    return -EBUSY;
    }
    -
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