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    Subject[RFC PATCH 12/15] drivers/acrn: add driver-specific IRQ handle to dispatch IO_REQ request
    Date
    After ACRN hypervisor captures the io_request(mmio, IO, PCI access) from
    guest OS, it will send the IRQ interrupt to SOS system.
    The HYPERVISOR_CALLBACK_VECTOR ISR handler will be executed and it
    needs to call the driver-specific ISR handler to dispatch emulated
    io_request.
    After the emulation of ioreq request is finished, the ACRN hypervisor
    is notified and then can resume the execution of guest OS.

    Co-developed-by: Jason Chen CJ <jason.cj.chen@intel.com>
    Signed-off-by: Jason Chen CJ <jason.cj.chen@intel.com>
    Co-developed-by: Mingqiang Chi <mingqiang.chi@intel.com>
    Signed-off-by: Mingqiang Chi <mingqiang.chi@intel.com>
    Co-developed-by: Liu Shuo <shuo.a.liu@intel.com>
    Signed-off-by: Liu Shuo <shuo.a.liu@intel.com>
    Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
    ---
    drivers/staging/acrn/acrn_dev.c | 41 +++++++++++++++++++++++++++++++++++++++++
    1 file changed, 41 insertions(+)

    diff --git a/drivers/staging/acrn/acrn_dev.c b/drivers/staging/acrn/acrn_dev.c
    index 28258fb..93f45e3 100644
    --- a/drivers/staging/acrn/acrn_dev.c
    +++ b/drivers/staging/acrn/acrn_dev.c
    @@ -18,6 +18,7 @@
    #include <linux/kdev_t.h>
    #include <linux/kernel.h>
    #include <linux/init.h>
    +#include <linux/interrupt.h>
    #include <linux/io.h>
    #include <linux/mm.h>
    #include <linux/module.h>
    @@ -41,6 +42,7 @@ static int acrn_hsm_inited;
    static int major;
    static struct class *acrn_class;
    static struct device *acrn_device;
    +static struct tasklet_struct acrn_io_req_tasklet;

    static
    int acrn_dev_open(struct inode *inodep, struct file *filep)
    @@ -416,6 +418,16 @@ long acrn_dev_ioctl(struct file *filep,
    break;
    }
    case IC_CLEAR_VM_IOREQ: {
    + /*
    + * we need to flush the current pending ioreq dispatch
    + * tasklet and finish it before clearing all ioreq of this VM.
    + * With tasklet_kill, there still be a very rare race which
    + * might lost one ioreq tasklet for other VMs. So arm one after
    + * the clearing. It's harmless.
    + */
    + tasklet_schedule(&acrn_io_req_tasklet);
    + tasklet_kill(&acrn_io_req_tasklet);
    + tasklet_schedule(&acrn_io_req_tasklet);
    acrn_ioreq_clear_request(vm);
    break;
    }
    @@ -449,6 +461,28 @@ static int acrn_dev_release(struct inode *inodep, struct file *filep)
    return 0;
    }

    +static void io_req_tasklet(unsigned long data)
    +{
    + struct acrn_vm *vm;
    + /* This is already in tasklet. Use read_lock for list_lock */
    +
    + read_lock(&acrn_vm_list_lock);
    + list_for_each_entry(vm, &acrn_vm_list, list) {
    + if (!vm || !vm->req_buf)
    + break;
    +
    + get_vm(vm);
    + acrn_ioreq_distribute_request(vm);
    + put_vm(vm);
    + }
    + read_unlock(&acrn_vm_list_lock);
    +}
    +
    +static void acrn_intr_handler(void)
    +{
    + tasklet_schedule(&acrn_io_req_tasklet);
    +}
    +
    static const struct file_operations fops = {
    .open = acrn_dev_open,
    .release = acrn_dev_release,
    @@ -462,6 +496,7 @@ static const struct file_operations fops = {

    static int __init acrn_init(void)
    {
    + unsigned long flag;
    struct api_version *api_version;
    acrn_hsm_inited = 0;
    if (x86_hyper_type != X86_HYPER_ACRN)
    @@ -518,6 +553,10 @@ static int __init acrn_init(void)
    return PTR_ERR(acrn_device);
    }

    + tasklet_init(&acrn_io_req_tasklet, io_req_tasklet, 0);
    + local_irq_save(flag);
    + acrn_setup_intr_irq(acrn_intr_handler);
    + local_irq_restore(flag);
    acrn_ioreq_driver_init();
    pr_info("acrn: ACRN Hypervisor service module initialized\n");
    acrn_hsm_inited = 1;
    @@ -529,6 +568,8 @@ static void __exit acrn_exit(void)
    if (!acrn_hsm_inited)
    return;

    + tasklet_kill(&acrn_io_req_tasklet);
    + acrn_remove_intr_irq();
    device_destroy(acrn_class, MKDEV(major, 0));
    class_unregister(acrn_class);
    class_destroy(acrn_class);
    --
    2.7.4
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