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| Started by | Borislav Petkov <bp@alien8.de> |
|---|---|
| First post | 2015-12-04 13:30 +0100 |
| Last post | 2015-12-04 15:40 +0100 |
| Articles | 3 — 2 participants |
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Re: [PATCH 8/9] Documentation: Add ivrs_acpihid kernel parameter description Borislav Petkov <bp@alien8.de> - 2015-12-04 13:30 +0100
RE: [PATCH 8/9] Documentation: Add ivrs_acpihid kernel parameter description "Wan, Vincent" <Vincent.Wan@amd.com> - 2015-12-04 15:00 +0100
Re: [PATCH 8/9] Documentation: Add ivrs_acpihid kernel parameter description Borislav Petkov <bp@alien8.de> - 2015-12-04 15:40 +0100
| From | Borislav Petkov <bp@alien8.de> |
|---|---|
| Date | 2015-12-04 13:30 +0100 |
| Subject | Re: [PATCH 8/9] Documentation: Add ivrs_acpihid kernel parameter description |
| Message-ID | <qBXES-2B5-19@gated-at.bofh.it> |
On Fri, Dec 04, 2015 at 11:24:25AM +0800, Wang Hongcheng wrote:
> From: Wan Zongshun <Vincent.Wan@amd.com>
>
> Add ivrs_acpihid kernel parameter description,
> like ivrs_acpihid[00:14.5]=AMD0020:0.
>
> Signed-off-by: Wan Zongshun <Vincent.Wan@amd.com>
> ---
> Documentation/kernel-parameters.txt | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> index 742f69d..5c364c6 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -1680,6 +1680,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
> PCI device 00:14.0 write the parameter as:
> ivrs_hpet[0]=00:14.0
>
> + ivrs_acpihid [HW,X86_64]
> + Provide an override to the ACPI-HID:UID<->DEVICE-ID
> + mapping provided in the IVRS ACPI table. For
> + example, to map UART-HID:UID AMD0020:0 to
> + PCI device 00:14.5 write the parameter as:
> + ivrs_acpihid[00:14.5]=AMD0020:0
What is that parameter needed for? Can't you deduce the mapping from the
hardware?
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
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| From | "Wan, Vincent" <Vincent.Wan@amd.com> |
|---|---|
| Date | 2015-12-04 15:00 +0100 |
| Message-ID | <qBZ3Y-3lZ-9@gated-at.bofh.it> |
| In reply to | #1283777 |
PiA+ICsJaXZyc19hY3BpaGlkCVtIVyxYODZfNjRdDQo+ID4gKwkJCVByb3ZpZGUgYW4gb3ZlcnJp ZGUgdG8gdGhlIEFDUEktSElEOlVJRDwtPkRFVklDRS1JRA0KPiA+ICsJCQltYXBwaW5nIHByb3Zp ZGVkIGluIHRoZSBJVlJTIEFDUEkgdGFibGUuIEZvcg0KPiA+ICsJCQlleGFtcGxlLCB0byBtYXAg VUFSVC1ISUQ6VUlEIEFNRDAwMjA6MCB0bw0KPiA+ICsJCQlQQ0kgZGV2aWNlIDAwOjE0LjUgd3Jp dGUgdGhlIHBhcmFtZXRlciBhczoNCj4gPiArCQkJCWl2cnNfYWNwaWhpZFswMDoxNC41XT1BTUQw MDIwOjANCj4gDQo+IFdoYXQgaXMgdGhhdCBwYXJhbWV0ZXIgbmVlZGVkIGZvcj8gQ2FuJ3QgeW91 IGRlZHVjZSB0aGUgbWFwcGluZyBmcm9tIHRoZQ0KPiBoYXJkd2FyZT8NCg0KSXQgaXMgdmVyeSBs aWtlIGl2cnNfaW9hcGljLyBpdnJzX2hwZXQsIHdoaWNoIGNhbiBvdmVycmlkZSB0aGUgZGVkaWNh dGVkIEJERiBpZCBtYXBwZWQgdG8gSElEOlVJRCB0aGF0IHdhcyByZXBvcnRlZCBmcm9tIEJJT1Mn cyBJVkhEIGVudHJ5Lg0KSWYgQklPUyBkaWQgbm90IHJlcG9ydCBhIHJpZ2h0IEJERiwgd2UgY2Fu IHJlc29ydCB0byB0aGlzIHBhcmFtZXRlciB0byBjb3JyZWN0IGl0Lg0KDQo+IA0KPiAtLQ0KPiBS ZWdhcmRzL0dydXNzLA0KPiAgICAgQm9yaXMuDQo+IA0KPiBFQ08gdGlwICMxMDE6IFRyaW0geW91 ciBtYWlscyB3aGVuIHlvdSByZXBseS4NCg== -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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| From | Borislav Petkov <bp@alien8.de> |
|---|---|
| Date | 2015-12-04 15:40 +0100 |
| Message-ID | <qBZGG-3Ud-25@gated-at.bofh.it> |
| In reply to | #1283823 |
On Fri, Dec 04, 2015 at 01:19:35PM +0000, Wan, Vincent wrote:
> > > + ivrs_acpihid [HW,X86_64]
> > > + Provide an override to the ACPI-HID:UID<->DEVICE-ID
> > > + mapping provided in the IVRS ACPI table. For
> > > + example, to map UART-HID:UID AMD0020:0 to
> > > + PCI device 00:14.5 write the parameter as:
> > > + ivrs_acpihid[00:14.5]=AMD0020:0
> >
> > What is that parameter needed for? Can't you deduce the mapping from the
> > hardware?
>
> It is very like ivrs_ioapic/ ivrs_hpet, which can override the dedicated BDF id mapped to HID:UID that was reported from BIOS's IVHD entry.
> If BIOS did not report a right BDF, we can resort to this parameter to correct it.
Please add a verbose, human-readable explanation to the text so that
people know what it is for. The text above is hard to parse even for
insiders.
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
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