Re: [Qemu-devel] [Qemu-ppc] [PATCH v9 1/1] Add USB option in machine options

[Li Zhang]

On Tue, Aug 28, 2012 at 2:08 AM, Blue Swirl <address@hidden> wrote:
> On Mon, Aug 27, 2012 at 1:59 AM, Alexander Graf <address@hidden> wrote:
>>
>>
>> On 26.08.2012, at 10:34, Blue Swirl <address@hidden> wrote:
>>
>>> On Sat, Aug 25, 2012 at 2:27 PM, Alexander Graf <address@hidden> wrote:
>>>>
>>>>
>>>> On 25.08.2012, at 00:43, Blue Swirl <address@hidden> wrote:
>>>>
>>>>> On Wed, Aug 22, 2012 at 10:31 AM, Li Zhang <address@hidden> wrote:
>>>>>> When -usb option is used, global varible usb_enabled is set.
>>>>>> And all the plafrom will create one USB controller according
>>>>>> to this variable. In fact, global varibles make code hard
>>>>>> to read.
>>>>>>
>>>>>> So this patch is to remove global variable usb_enabled and
>>>>>> add USB option in machine options. All the plaforms will get
>>>>>> USB option value from machine options.
>>>>>>
>>>>>> USB option of machine options will be set either by:
>>>>>> * -usb
>>>>>> * -machine type=pseries,usb=on
>>>>>>
>>>>>> Both these ways can work now. They both set USB option in
>>>>>> machine options. In the future, the first way will be removed.
>>>>>>
>>>>>> Signed-off-by: Li Zhang <address@hidden>
>>>>>> ---
>>>>>> v7->v8 :
>>>>>> * Declare usb_enabled() and set_usb_option() in sysemu.h
>>>>>> * Separate USB enablement on sPAPR platform.
>>>>>>
>>>>>> v8->v9:
>>>>>> * Fix usb_enable() default value on sPAPR and MAC99
>>>>>>
>>>>>> Signed-off-by: Li Zhang <address@hidden>
>>>>>>
>>>>>> diff --git a/hw/nseries.c b/hw/nseries.c
>>>>>> index 4df2670..c67e95a 100644
>>>>>> --- a/hw/nseries.c
>>>>>> +++ b/hw/nseries.c
>>>>>> @@ -1322,7 +1322,7 @@ static void n8x0_init(ram_addr_t ram_size, const 
>>>>>> char *boot_device,
>>>>>>    n8x0_dss_setup(s);
>>>>>>    n8x0_cbus_setup(s);
>>>>>>    n8x0_uart_setup(s);
>>>>>> -    if (usb_enabled)
>>>>>> +    if (usb_enabled(false))
>>>>>
>>>>> Please add braces.
>>>>>
>>>>> I don't like this usb_enabled(false) way very much but I don't have
>>>>> anything better to suggest.
>>>>>
>>>>>>        n8x0_usb_setup(s);
>>>>>>
>>>>>>    if (kernel_filename) {
>>>>>> diff --git a/hw/pc_piix.c b/hw/pc_piix.c
>>>>>> index 0c0096f..b662192 100644
>>>>>> --- a/hw/pc_piix.c
>>>>>> +++ b/hw/pc_piix.c
>>>>>> @@ -267,7 +267,7 @@ static void pc_init1(MemoryRegion *system_memory,
>>>>>>    pc_cmos_init(below_4g_mem_size, above_4g_mem_size, boot_device,
>>>>>>                 floppy, idebus[0], idebus[1], rtc_state);
>>>>>>
>>>>>> -    if (pci_enabled && usb_enabled) {
>>>>>> +    if (pci_enabled && usb_enabled(false)) {
>>>>>>        pci_create_simple(pci_bus, piix3_devfn + 2, "piix3-usb-uhci");
>>>>>>    }
>>>>>>
>>>>>> diff --git a/hw/ppc_newworld.c b/hw/ppc_newworld.c
>>>>>> index e95cfe8..1d4f494 100644
>>>>>> --- a/hw/ppc_newworld.c
>>>>>> +++ b/hw/ppc_newworld.c
>>>>>> @@ -348,10 +348,6 @@ static void ppc_core99_init (ram_addr_t ram_size,
>>>>>>    ide_mem[1] = pmac_ide_init(hd, pic[0x0d], dbdma, 0x16, pic[0x02]);
>>>>>>    ide_mem[2] = pmac_ide_init(&hd[MAX_IDE_DEVS], pic[0x0e], dbdma, 0x1a, 
>>>>>> pic[0x02]);
>>>>>>
>>>>>> -    /* cuda also initialize ADB */
>>>>>> -    if (machine_arch == ARCH_MAC99_U3) {
>>>>>> -        usb_enabled = 1;
>>>>>> -    }
>>>>>>    cuda_init(&cuda_mem, pic[0x19]);
>>>>>>
>>>>>>    adb_kbd_init(&adb_bus);
>>>>>> @@ -360,15 +356,14 @@ static void ppc_core99_init (ram_addr_t ram_size,
>>>>>>    macio_init(pci_bus, PCI_DEVICE_ID_APPLE_UNI_N_KEYL, 0, pic_mem,
>>>>>>               dbdma_mem, cuda_mem, NULL, 3, ide_mem, escc_bar);
>>>>>>
>>>>>> -    if (usb_enabled) {
>>>>>> +    if (usb_enabled(machine_arch == ARCH_MAC99_U3)) {
>>>>>>        pci_create_simple(pci_bus, -1, "pci-ohci");
>>>>>> -    }
>>>>>> -
>>>>>> -    /* U3 needs to use USB for input because Linux doesn't support 
>>>>>> via-cuda
>>>>>> -       on PPC64 */
>>>>>> -    if (machine_arch == ARCH_MAC99_U3) {
>>>>>> -        usbdevice_create("keyboard");
>>>>>> -        usbdevice_create("mouse");
>>>>>> +        /* U3 needs to use USB for input because Linux doesn't support 
>>>>>> via-cuda
>>>>>> +        on PPC64 */
>>>>>> +        if (machine_arch == ARCH_MAC99_U3) {
>>>>>> +            usbdevice_create("keyboard");
>>>>>> +            usbdevice_create("mouse");
>>>>>> +        }
>>>>>>    }
>>>>>>
>>>>>>    if (graphic_depth != 15 && graphic_depth != 32 && graphic_depth != 8)
>>>>>> diff --git a/hw/ppc_oldworld.c b/hw/ppc_oldworld.c
>>>>>> index 1dcd8a6..1468a32 100644
>>>>>> --- a/hw/ppc_oldworld.c
>>>>>> +++ b/hw/ppc_oldworld.c
>>>>>> @@ -286,7 +286,7 @@ static void ppc_heathrow_init (ram_addr_t ram_size,
>>>>>>    macio_init(pci_bus, PCI_DEVICE_ID_APPLE_343S1201, 1, pic_mem,
>>>>>>               dbdma_mem, cuda_mem, nvr, 2, ide_mem, escc_bar);
>>>>>>
>>>>>> -    if (usb_enabled) {
>>>>>> +    if (usb_enabled(false)) {
>>>>>>        pci_create_simple(pci_bus, -1, "pci-ohci");
>>>>>>    }
>>>>>>
>>>>>> diff --git a/hw/ppc_prep.c b/hw/ppc_prep.c
>>>>>> index 7a87616..feeb903 100644
>>>>>> --- a/hw/ppc_prep.c
>>>>>> +++ b/hw/ppc_prep.c
>>>>>> @@ -662,7 +662,7 @@ static void ppc_prep_init (ram_addr_t ram_size,
>>>>>>    memory_region_add_subregion(sysmem, 0xFEFF0000, xcsr);
>>>>>> #endif
>>>>>>
>>>>>> -    if (usb_enabled) {
>>>>>> +    if (usb_enabled(false)) {
>>>>>>        pci_create_simple(pci_bus, -1, "pci-ohci");
>>>>>>    }
>>>>>>
>>>>>> diff --git a/hw/pxa2xx.c b/hw/pxa2xx.c
>>>>>> index d5f1420..4787279 100644
>>>>>> --- a/hw/pxa2xx.c
>>>>>> +++ b/hw/pxa2xx.c
>>>>>> @@ -2108,7 +2108,7 @@ PXA2xxState *pxa270_init(MemoryRegion 
>>>>>> *address_space,
>>>>>>        s->ssp[i] = (SSIBus *)qdev_get_child_bus(dev, "ssi");
>>>>>>    }
>>>>>>
>>>>>> -    if (usb_enabled) {
>>>>>> +    if (usb_enabled(false)) {
>>>>>>        sysbus_create_simple("sysbus-ohci", 0x4c000000,
>>>>>>                        qdev_get_gpio_in(s->pic, PXA2XX_PIC_USBH1));
>>>>>>    }
>>>>>> @@ -2239,7 +2239,7 @@ PXA2xxState *pxa255_init(MemoryRegion 
>>>>>> *address_space, unsigned int sdram_size)
>>>>>>        s->ssp[i] = (SSIBus *)qdev_get_child_bus(dev, "ssi");
>>>>>>    }
>>>>>>
>>>>>> -    if (usb_enabled) {
>>>>>> +    if (usb_enabled(false)) {
>>>>>>        sysbus_create_simple("sysbus-ohci", 0x4c000000,
>>>>>>                        qdev_get_gpio_in(s->pic, PXA2XX_PIC_USBH1));
>>>>>>    }
>>>>>> diff --git a/hw/realview.c b/hw/realview.c
>>>>>> index 19db4d0..a8d6f97 100644
>>>>>> --- a/hw/realview.c
>>>>>> +++ b/hw/realview.c
>>>>>> @@ -227,7 +227,7 @@ static void realview_init(ram_addr_t ram_size,
>>>>>>        sysbus_connect_irq(busdev, 2, pic[50]);
>>>>>>        sysbus_connect_irq(busdev, 3, pic[51]);
>>>>>>        pci_bus = (PCIBus *)qdev_get_child_bus(dev, "pci");
>>>>>> -        if (usb_enabled) {
>>>>>> +        if (usb_enabled(false)) {
>>>>>>            pci_create_simple(pci_bus, -1, "pci-ohci");
>>>>>>        }
>>>>>>        n = drive_get_max_bus(IF_SCSI);
>>>>>> diff --git a/hw/spapr.c b/hw/spapr.c
>>>>>> index be533ee..2e31797 100644
>>>>>> --- a/hw/spapr.c
>>>>>> +++ b/hw/spapr.c
>>>>>> @@ -766,7 +766,7 @@ static void ppc_spapr_init(ram_addr_t ram_size,
>>>>>>        spapr->has_graphics = true;
>>>>>>    }
>>>>>>
>>>>>> -    if (usb_enabled) {
>>>>>> +    if (usb_enabled(spapr->has_graphics)) {
>>>>>>        pci_create_simple(QLIST_FIRST(&spapr->phbs)->host_state.bus,
>>>>>>                          -1, "pci-ohci");
>>>>>>        if (spapr->has_graphics) {
>>>>>> diff --git a/hw/versatilepb.c b/hw/versatilepb.c
>>>>>> index 7a92034..df32c8b 100644
>>>>>> --- a/hw/versatilepb.c
>>>>>> +++ b/hw/versatilepb.c
>>>>>> @@ -247,7 +247,7 @@ static void versatile_init(ram_addr_t ram_size,
>>>>>>            pci_nic_init_nofail(nd, "rtl8139", NULL);
>>>>>>        }
>>>>>>    }
>>>>>> -    if (usb_enabled) {
>>>>>> +    if (usb_enabled(false)) {
>>>>>>        pci_create_simple(pci_bus, -1, "pci-ohci");
>>>>>>    }
>>>>>>    n = drive_get_max_bus(IF_SCSI);
>>>>>> diff --git a/qemu-config.c b/qemu-config.c
>>>>>> index c05ffbc..d1a86cf 100644
>>>>>> --- a/qemu-config.c
>>>>>> +++ b/qemu-config.c
>>>>>> @@ -612,6 +612,10 @@ static QemuOptsList qemu_machine_opts = {
>>>>>>            .name = "dump-guest-core",
>>>>>>            .type = QEMU_OPT_BOOL,
>>>>>>            .help = "Include guest memory in  a core dump",
>>>>>> +        },{
>>>>>> +            .name = "usb",
>>>>>> +            .type = QEMU_OPT_BOOL,
>>>>>> +            .help = "Set on/off to enable/disable usb",
>>>>>>        },
>>>>>>        { /* End of list */ }
>>>>>>    },
>>>>>> diff --git a/sysemu.h b/sysemu.h
>>>>>> index 65552ac..be0905e 100644
>>>>>> --- a/sysemu.h
>>>>>> +++ b/sysemu.h
>>>>>> @@ -119,7 +119,6 @@ extern const char *keyboard_layout;
>>>>>> extern int win2k_install_hack;
>>>>>> extern int alt_grab;
>>>>>> extern int ctrl_grab;
>>>>>> -extern int usb_enabled;
>>>>>> extern int smp_cpus;
>>>>>> extern int max_cpus;
>>>>>> extern int cursor_hide;
>>>>>> @@ -189,4 +188,8 @@ void register_devices(void);
>>>>>> void add_boot_device_path(int32_t bootindex, DeviceState *dev,
>>>>>>                          const char *suffix);
>>>>>> char *get_boot_devices_list(uint32_t *size);
>>>>>> +
>>>>>> +bool usb_enabled(bool default_usb);
>>>>>> +void set_usb_option(bool usb_option);
>>>>>> +
>>>>>> #endif
>>>>>> diff --git a/vl.c b/vl.c
>>>>>> index 7c577fa..4702e33 100644
>>>>>> --- a/vl.c
>>>>>> +++ b/vl.c
>>>>>> @@ -203,7 +203,6 @@ CharDriverState *serial_hds[MAX_SERIAL_PORTS];
>>>>>> CharDriverState *parallel_hds[MAX_PARALLEL_PORTS];
>>>>>> CharDriverState *virtcon_hds[MAX_VIRTIO_CONSOLES];
>>>>>> int win2k_install_hack = 0;
>>>>>> -int usb_enabled = 0;
>>>>>> int singlestep = 0;
>>>>>> int smp_cpus = 1;
>>>>>> int max_cpus = 0;
>>>>>> @@ -790,6 +789,27 @@ static int parse_sandbox(QemuOpts *opts, void 
>>>>>> *opaque)
>>>>>>    return 0;
>>>>>> }
>>>>>>
>>>>>> +/*********QEMU USB setting******/
>>>>>> +bool usb_enabled(bool default_usb)
>>>>>> +{
>>>>>> +    QemuOpts *mach_opts;
>>>>>> +    mach_opts = qemu_opts_find(qemu_find_opts("machine"), 0);
>>>>>> +    if (mach_opts) {
>>>>>> +        return qemu_opt_get_bool(mach_opts, "usb", default_usb);
>>>>>> +    }
>>>>>> +    return default_usb;
>>>>>> +}
>>>>>
>>>>> It would be more optimal to go through the options only once after
>>>>> machine selection in vl.c, setting some flags as a result. Then this
>>>>> and below functions would only check against those flags.
>>>>
>>>> This is not a performance critical code path, right? So I'd prefer to have 
>>>> a single point of information (machine opts) rather than yet another 
>>>> global variable.
>>>
>>> The flags don't have to be global, they can be static to vl.c.
>>
>> It would still be duplication of information bits that need to be 
>> synchronized. I don't see any point for the set_usb_option helper. So why 
>> bother with another variable when we have one in the machine opts?
>
> If set_usb_option() is deleted (I don't see any callers), the variable
When -usb or -usbdevice is used, this function is called.
It is as the following in my patch.
            case QEMU_OPTION_usb:
-                usb_enabled = 1;
+                set_usb_option(true);
                 break;
             case QEMU_OPTION_usbdevice:
-                usb_enabled = 1;
+                set_usb_option(true);
                 add_device_config(DEV_USB, optarg);
                 break;

> could be static to usb_enabled(). But yes, the function is probably
> called only once at board init, so caching would not make sense.
>
>>
>> Alex
>>
>>>
>>>>
>>>> Alex
>>>>
>>>>>
>>>>>> +
>>>>>> +void set_usb_option(bool usb_option)
>>>>>> +{
>>>>>> +    QemuOpts *mach_opts;
>>>>>> +    mach_opts = qemu_opts_find(qemu_find_opts("machine"), 0);
>>>>>> +    if (mach_opts) {
>>>>>> +        qemu_opt_set_bool(mach_opts, "usb", usb_option);
>>>>>> +    }
>>>>>> +}
>>>>>> +
>>>>>> +
>>>>>> /***********************************************************/
>>>>>> /* QEMU Block devices */
>>>>>>
>>>>>> @@ -1078,8 +1098,9 @@ static int usb_device_add(const char *devname)
>>>>>>    const char *p;
>>>>>>    USBDevice *dev = NULL;
>>>>>>
>>>>>> -    if (!usb_enabled)
>>>>>> +    if (!usb_enabled(false)) {
>>>>>>        return -1;
>>>>>> +    }
>>>>>>
>>>>>>    /* drivers with .usbdevice_name entry in USBDeviceInfo */
>>>>>>    dev = usbdevice_create(devname);
>>>>>> @@ -1115,8 +1136,9 @@ static int usb_device_del(const char *devname)
>>>>>>    if (strstart(devname, "host:", &p))
>>>>>>        return usb_host_device_close(p);
>>>>>>
>>>>>> -    if (!usb_enabled)
>>>>>> +    if (!usb_enabled(false)) {
>>>>>>        return -1;
>>>>>> +    }
>>>>>>
>>>>>>    p = strchr(devname, '.');
>>>>>>    if (!p)
>>>>>> @@ -3062,10 +3084,10 @@ int main(int argc, char **argv, char **envp)
>>>>>>                }
>>>>>>                break;
>>>>>>            case QEMU_OPTION_usb:
>>>>>> -                usb_enabled = 1;
>>>>>> +                set_usb_option(true);
>>>>>>                break;
>>>>>>            case QEMU_OPTION_usbdevice:
>>>>>> -                usb_enabled = 1;
>>>>>> +                set_usb_option(true);
>>>>>>                add_device_config(DEV_USB, optarg);
>>>>>>                break;
>>>>>>            case QEMU_OPTION_device:
>>>>>> @@ -3623,7 +3645,7 @@ int main(int argc, char **argv, char **envp)
>>>>>>    current_machine = machine;
>>>>>>
>>>>>>    /* init USB devices */
>>>>>> -    if (usb_enabled) {
>>>>>> +    if (usb_enabled(false)) {
>>>>>>        if (foreach_device_config(DEV_USB, usb_parse) < 0)
>>>>>>            exit(1);
>>>>>>    }
>>>>>> --
>>>>>> 1.7.7.6
>>>>>>
>>>>>>
>>>>>



-- 

Best Regards
-Li