Date: Fri, 20 Aug 2004 10:03:58 +0300 From: Iasen Kostov <tbyte@OTEL.net> To: takawata@jp.freebsd.org Cc: freebsd-hackers@freebsd.org Subject: Re: How can I fake a device ? Message-ID: <4125A25E.4050602@OTEL.net> In-Reply-To: <200408200549.OAA02607@axe-inc.co.jp> References: <200408200549.OAA02607@axe-inc.co.jp>
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takawata@jp.freebsd.org wrote:
>In message <41257789.70508@OTEL.net>, Iasen Kostov wrote:
>
>
>> Hi,
>>I want to know is there a way to call *_probe (for device driver) with
>>fake (PCI) device that does not exists in the system ?
>>First of all a cant find how "struct device" is declared (i've searched
>>even the compile/ dir) and second I think that I'll need to intercept
>>pci_get_vendor and pci_get_device funcs with my own which should detect
>>the fake device and thus will return vandor/device that I need to fake.
>>I realy don't need anything else except _probe ...
>>
>>
>
>I have never tried such but grimpsed the PCI framework,
>I propose the following, though I don't imagine why you want
>to do so:
>
>Your driver have to contain DEVICE_IDENTIFY method
>that calls device_add_child to allocate device_t object.
>Then you allocate 'struct pci_devinfo' and initialize
>pci_devinfo as you like. And you have to make your
>driver as a module. Then a device object will show up on
>the device tree on your system.
>
>You may want to have a look at pci_add_children@/sys/dev/pci/pci.c
>
>
>
I think I was not clear .. .sorry. I ment to lie the driver that some
device (that is not realy plugged in the machine) exists. Doing so I can
check if drivers _probe() func returns "OK"
or not and by checking every device from /usr/share/misc/pci_vendors I
could build device<->driver_file database.
I've patched a bit /sys/dev/pci/pci.c like this:
typedef uintptr_t *pci_fake_read_ivars_t(pcicfgregs *cfg);
static pci_fake_read_ivars_t *pci_fake_read_ivars = NULL;
int
pci_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
{
struct pci_devinfo *dinfo;
pcicfgregs *cfg = NULL;
if(pci_fake_read_ivars && !strcmp("fake0", dev->nameunit)) {
(*pci_fake_read_ivars)(cfg);
} else {
dinfo = device_get_ivars(child);
cfg = &dinfo->cfg;
}
And when I load my module it will set pci_fake_read_ivars and will start
to test drivers probe sending devices with nameunit set to "fake0" thus
telling pci_read_ivar() to fake the return values by calling
pci_fake_read_ivars() callback ... I think this is very messy ... I hope
that it will work this way :)
regards
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