From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Woodhouse Subject: Re: [PATCH 6/9] drm/i915: driver based PASID handling Date: Fri, 09 Oct 2015 10:07:21 +0100 Message-ID: <1444381641.92154.65.camel@infradead.org> References: <1441385943-11508-1-git-send-email-jbarnes@virtuousgeek.org> <1441385943-11508-7-git-send-email-jbarnes@virtuousgeek.org> <1444222816.4674.322.camel@infradead.org> <5615375A.6070705@virtuousgeek.org> <20151007161424.GV3383@phenom.ffwll.local> <5616538A.4000900@intel.com> <1444344368.92154.8.camel@infradead.org> <20151009072837.GB18060@phenom.ffwll.local> <1444377384.92154.64.camel@infradead.org> <20151009084747.GN26718@phenom.ffwll.local> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0872688304==" Return-path: Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) by gabe.freedesktop.org (Postfix) with ESMTPS id CBA016E744 for ; Fri, 9 Oct 2015 02:07:25 -0700 (PDT) In-Reply-To: <20151009084747.GN26718@phenom.ffwll.local> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" To: Daniel Vetter Cc: "intel-gfx@lists.freedesktop.org" List-Id: intel-gfx@lists.freedesktop.org --===============0872688304== Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-qXP3nTCMCeXPyViX2ILu" --=-qXP3nTCMCeXPyViX2ILu Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2015-10-09 at 10:47 +0200, Daniel Vetter wrote: > On Fri, Oct 09, 2015 at 08:56:24AM +0100, David Woodhouse wrote: > > On Fri, 2015-10-09 at 09:28 +0200, Daniel Vetter wrote: > > >=20 > > > Hm if this still works the same way as on older platforms then pagefa= ults > > > just read all 0 and writes go nowhere from the gpu. That generally al= so > > > explains ever-increasing numbers of the CS execution pointer since it= 's > > > busy churning through 48b worth of address space filled with MI_NOP. = I'd > > > have hoped our hw would do better than that with svm ... > >=20 > > I'm looking at simple cases like Jesse's 'gem_svm_fault' test. If the > > access to process address space (a single dword write) does nothing, > > I'm not sure why it would then churn through MI_NOOPs; why would the > > batch still not complete? >=20 > Yeah that testcase doesn't fit, the one I had in mind is where the batch > itself faults and the CS just reads MI_NOP forever. No idea why the gpu > just keeps walking through the address space here. Puzzling. Does it just keep walking through the address space? When I hacked my page request handler to *not* service the fault and just say it failed, the batch did seem to complete as normal. Just without doing the write, as you described. --=20 David Woodhouse Open Source Technology Centre David.Woodhouse@intel.com Intel Corporation --=-qXP3nTCMCeXPyViX2ILu Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIISjjCCBicw ggUPoAMCAQICAw3vNzANBgkqhkiG9w0BAQUFADCBjDELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0 YXJ0Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNpZ25pbmcx ODA2BgNVBAMTL1N0YXJ0Q29tIENsYXNzIDEgUHJpbWFyeSBJbnRlcm1lZGlhdGUgQ2xpZW50IENB MB4XDTE1MDUwNTA5NDM0MVoXDTE2MDUwNTA5NTMzNlowQjEcMBoGA1UEAwwTZHdtdzJAaW5mcmFk ZWFkLm9yZzEiMCAGCSqGSIb3DQEJARYTZHdtdzJAaW5mcmFkZWFkLm9yZzCCASIwDQYJKoZIhvcN AQEBBQADggEPADCCAQoCggEBAMkbm9kPbx1j/X4RVyf/pPKSYwelcco69TvnQQbKM8m8xkWjXJI1 jpJ1jMaGUZGFToINMSZi7lZawUozudWbXSKy1SikENSTJHffsdRAIlsp+hR8vWvjsKUry6sEdqPG 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