Hi Tom,
On onnv build version with IRM(interrupt resouce management), there is
special code to
support "#msix-request" device property on SPARC system as defined in
PSARC/2007/453 :
uint_t
i_ddi_get_msix_alloc_limit(dev_info_t *dip)
{
uint_t msix_alloc_limit = ddi_msix_alloc_limit;
#if defined(__sparc)
if (ddi_prop_exists(DDI_DEV_T_ANY, dip, DDI_PROP_NOTPROM |
DDI_PROP_DONTPASS, "#msix-request")) {
msix_alloc_limit = MAX(DDI_MAX_MSIX_ALLOC,
ddi_msix_alloc_limit);
}
#endif
return (msix_alloc_limit);
}
That onepager has been obsoleted IRM project. Currently IRM is only
supported on SPARC
too. On x86 system, there is another hardcoded logic which causes limitation
on maximum allocable
MSI-X interrupt for a single device. Please refer to
uts/common/os/ddi_intr_impl.c, there is code for it:
#if defined(__i386) || defined(__amd64)
/*
* MSI-X allocation limit.
*/
uint_t ddi_msix_alloc_limit = DDI_DEFAULT_MSIX_ALLOC;
#endif
#if defined(__i386) || defined(__amd64)
/* Global tunable workaround */
if (type == DDI_INTR_TYPE_MSIX) {
navail = MIN(nintrs, ddi_msix_alloc_limit);
}
#endif
To allocate more than two MSI-X interrupts for a device on x86 system,
you may use kmdb or
/etc/system to override value of ddi_msix_alloc_limit.(I haven't test it, just
in theory it should work.)
Thanks!
Tom Chen <> wrote:
> Hi Aubrey,
>
> I follow the way the nxge driver does, ie. add:
> (void) ddi_prop_create(DDI_DEV_T_NONE, dip, DDI_PROP_CANSLEEP,
> "#msix-request", NULL, 0);
>
> See the link.
> http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/io/nxge/nxge_main.c#6700
>
>
>
> However, on my x86 server running nv107 OS, the number of MSI
> interrupts I can get remains 2.
>
>
>
> I am wondering if this method obsolete?
>
>
>
> Tom
>
>
> ----- Original Message -----
> From: "Aubrey Li" <aub...@opensolaris.org>
> To: "Tom Chen" <chento...@hotmail.com>
> Cc: <opensolaris-discuss@opensolaris.org>
> Sent: Tuesday, March 17, 2009 12:26 AM
> Subject: Re: [osol-discuss] MSIX interrupt allocation
>
>
> Hi Tom,
>
> Which build are you using?
> Please take a look at PSARC/2007/453 MSI-X interrupt limit override.
>
> Thanks,
> -Aubrey
> Intel OpenSolaris Team
>
> On Tue, Mar 17, 2009 at 8:38 AM, Tom Chen <chento...@hotmail.com>
> wrote:
>> Hi,
>>
>> I am using ddi_intr_alloc to allocate MSIX interrupt handles, I am
>> requesting 9, however, why the actual number is always 2 on both
>> Sparc and x86 machines?
>>
>> intr_type=DDI_INTR_TYPE_MSIX;
>> /*
>> * Get number of supported interrupts
>> */
>> rc = ddi_intr_get_nintrs(devinfo, intr_type, &count); /*
>> * Get number of available interrupts
>> */
>> rc = ddi_intr_get_navail(devinfo, intr_type, &avail);
>> request=9;
>> rc = ddi_intr_alloc(devinfo, qlge->htable, intr_type, 0,
>> request, &actual, DDI_INTR_ALLOC_NORMAL);
>>
>> why the actual is always 2?
>>
>> Tom
>> --
>> This message posted from opensolaris.org
>> _______________________________________________
>> opensolaris-discuss mailing list
>> opensolaris-discuss@opensolaris.org
>>
>
> _______________________________________________
> opensolaris-discuss mailing list
> opensolaris-discuss@opensolaris.org
Liu Jiang (Gerry)
OpenSolaris, OTC, SSG, Intel
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