[RFC PATCH 00/11] Refactor MSI to support Non-PCI device

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We in Freescale will be using MSI for the devices behind a new-bus (which is

not PCI based), We have a separate bus driver for same. And this new bus driver
register/provide its own address/data write function which is based on that
specific bus protocol.

Hi Bharat, I'm glad to know your MSI device working mode.
Provide the private MSI setup functions in bus-driver layer can't apply to all
Non-PCI MSI devices, because we can not guarantee Non-PCI MSI devices are always
on a bus. The existing HPET, DMAR device both have no bus bind.

Yes, that's why I was not sure of bus-driver or device-driver model.

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I'm working on a
new MSI setup framework, as you mentioned before, in device-driver model.

I abstracted a new virtual device (called struct msi_dev), this msi_dev will
manage all MSI info,

Will this "struct msi_dev" will be part of "struct device"?

struct msi_dev contains the struct device

piece code:

struct msi_dev {
    u8 type;
    u8 enabled;
    u8 nvec;
    u8 nvec_retry;
    char *id;
    void __iomem *base;
    struct msix_entry *entries;
    struct list_head msi_list;
    struct device dev;
    void *msi_data;
    struct msi_driver *driver;
    const struct attribute_group **irq_groups;
};


struct msi_driver {
    const char *name;
    char *id;
    void (*msi_set_enable)(struct msi_dev *dev, int enable);
    int (*msi_setup_entry)(struct msi_dev *dev, struct msi_desc *entry);
    int (*msix_setup_entries)(struct msi_dev *dev, struct msi_desc *entry, int index);
    u32 (*msi_mask_irq)(struct msi_desc *desc, u32 mask, u32 flag);
    u32 (*msix_mask_irq)(struct msi_desc *desc, u32 flag);
    void (*msi_read_message)(struct msi_desc *desc, struct msi_msg *msg);
    void (*msi_write_message)(struct msi_desc *desc, struct msi_msg *msg);
    void (*msi_set_legacy_irq)(struct msi_dev *dev, int enable);
    struct device_driver driver;
};

Thanks!
Yijing.

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and a new bus named msi_bus, also introduced a new driver
msi_driver, msi_bus is responsible for binding msi_dev and msi_driver.
All MSI devices will be classified into different MSI device types, like
MSI_TYPE_PCI, MSI_TYPE_HPET, MSI_TYPE_DMAR, etc..

Each MSI type device should provide a private struct msi_driver. msi_driver
should contain the type specific MSI ops functions to help setup and enable MSI
device, request MSI irq.

I almost finish the first draft, and will post out next week in plan :)

Will be looking forward to next version.

Thanks
-Bharat

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Thanks!
Yijing.

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Thanks
-Bharat

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My patchset is just a RFC draft, I will update it later, all we want
to do is make kernel support Non-PCI MSI devices.

Thanks!
Yijing.

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Thanks
Arnab
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Thanks!
Yijing

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Yijing

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Thanks!
Yijing