From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) by gabe.freedesktop.org (Postfix) with ESMTPS id 15E786E3F4 for ; Tue, 19 Nov 2019 18:58:34 +0000 (UTC) From: "Summers, Stuart" Date: Tue, 19 Nov 2019 18:58:31 +0000 Message-ID: <2f0c488ccf6a9f666e085674a5a9c8f1bdf6cdae.camel@intel.com> References: <20191119181619.11674-1-stuart.summers@intel.com> <20191119181619.11674-2-stuart.summers@intel.com> <157418792410.12093.8231741606090477200@skylake-alporthouse-com> In-Reply-To: <157418792410.12093.8231741606090477200@skylake-alporthouse-com> Content-Language: en-US MIME-Version: 1.0 Subject: Re: [igt-dev] [PATCH i-g-t 2/2] lib/i915/gem_mman: mmap to the CPU instead of the GTT in some tests List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============1205484619==" Errors-To: igt-dev-bounces@lists.freedesktop.org Sender: "igt-dev" To: "igt-dev@lists.freedesktop.org" , "chris@chris-wilson.co.uk" List-ID: --===============1205484619== Content-Language: en-US Content-Type: multipart/signed; micalg=sha-1; protocol="application/x-pkcs7-signature"; boundary="=-un8C/QA9mVgLljvissQd" --=-un8C/QA9mVgLljvissQd Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2019-11-19 at 18:25 +0000, Chris Wilson wrote: > Quoting Stuart Summers (2019-11-19 18:16:19) > > Do not limit to the GTT for tests which are not specifically > > testing > > capability in the GTT. > >=20 > > Signed-off-by: Stuart Summers > > --- > > lib/i915/gem_mman.c | 19 +++++++++++++++++++ > > lib/i915/gem_mman.h | 1 + > > tests/i915/gem_ctx_shared.c | 20 +++++--------------- > > tests/i915/gem_exec_schedule.c | 3 +-- > > 4 files changed, 26 insertions(+), 17 deletions(-) > >=20 > > diff --git a/lib/i915/gem_mman.c b/lib/i915/gem_mman.c > > index a0e34aef..d37840f7 100644 > > --- a/lib/i915/gem_mman.c > > +++ b/lib/i915/gem_mman.c > > @@ -40,6 +40,25 @@ > > #define VG(x) do {} while (0) > > #endif > > =20 > > +void *gem_mmap_host(int fd, uint32_t handle, uint64_t size, > > unsigned prot) > > +{ > > + void *ptr; > > + uint32_t domain; > > + > > + if (gem_has_mappable_ggtt(fd)) { > > + ptr =3D gem_mmap__gtt(fd, handle, size, prot); > > + domain =3D I915_GEM_DOMAIN_GTT; > > + } else { > > + ptr =3D gem_mmap__cpu(fd, handle, 0, size, prot); > > + domain =3D I915_GEM_DOMAIN_CPU; > > + } > > + > > + gem_set_domain(fd, handle, /* no write hazard lies! */ > > + domain, domain); >=20 > And be very careful putting the set-domain in here; as the lies are > integral to the test and not suitable for libraries. Domain handling > is > sadly of paramount importance for most tests. Hm.. so maybe a little more in the kernel to safeguard here. I was thinking of doing that anyway. Then we can adopt the tests as needed. And for these, maybe the right way to go is to use the new mmap_offset Zbigniew is implementing. The IOCTL posted by Abdiel already has a WC case for that. 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