linuxppc-dev.lists.ozlabs.org archive mirror
 help / color / mirror / Atom feed
From: Michael Neuling <mikey@neuling.org>
To: mpe@ellerman.id.au
Cc: linuxppc-dev@lists.ozlabs.org, paulus@ozlabs.org,
	david@gibson.dropbear.id.au, npiggin@gmail.com,
	pedromfc@linux.vnet.ibm.com, kvm-ppc@vger.kernel.org,
	Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Subject: [PATCH v3 7/8] powerpc: Disable DAWR on POWER9 via CPU feature quirk
Date: Tue, 27 Mar 2018 15:37:23 +1100	[thread overview]
Message-ID: <20180327043724.13862-8-mikey@neuling.org> (raw)
In-Reply-To: <20180327043724.13862-1-mikey@neuling.org>

This disables the DAWR on all POWER9 CPUs via cpu feature quirk.

Using the DAWR on POWER9 can cause xstops, hence we need to disable
it.

Signed-off-by: Michael Neuling <mikey@neuling.org>
---
 arch/powerpc/kernel/dt_cpu_ftrs.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/powerpc/kernel/dt_cpu_ftrs.c b/arch/powerpc/kernel/dt_cpu_ftrs.c
index 945e2c29ad..941a5fbd8d 100644
--- a/arch/powerpc/kernel/dt_cpu_ftrs.c
+++ b/arch/powerpc/kernel/dt_cpu_ftrs.c
@@ -709,6 +709,9 @@ static __init void cpufeatures_cpu_quirks(void)
 		cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD1;
 	else if ((version & 0xffffefff) == 0x004e0201)
 		cur_cpu_spec->cpu_features |= CPU_FTR_POWER9_DD2_1;
+
+	if ((version & 0xffff0000) == 0x004e0000)
+		cur_cpu_spec->cpu_features &= ~(CPU_FTR_DAWR);
 }
 
 static void __init cpufeatures_setup_finished(void)
-- 
2.14.1

  parent reply	other threads:[~2018-03-27  4:37 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-27  4:37 [PATCH v3 0/8] powerpc: Disable DAWR on POWER9 Michael Neuling
2018-03-27  4:37 ` [PATCH v3 1/8] powerpc: Add ppc_breakpoint_available() Michael Neuling
2018-03-28 14:13   ` [v3,1/8] " Michael Ellerman
2018-03-27  4:37 ` [PATCH v3 2/8] powerpc: Update ptrace to use ppc_breakpoint_available() Michael Neuling
2018-03-27  4:37 ` [PATCH v3 3/8] powerpc: Update xmon " Michael Neuling
2018-03-27  4:37 ` [PATCH v3 4/8] KVM: PPC: Book3S HV: Return error from h_set_mode(SET_DAWR) on POWER9 Michael Neuling
2018-03-27  4:37 ` [PATCH v3 5/8] KVM: PPC: Book3S HV: Return error from h_set_dabr() " Michael Neuling
2018-03-27  4:37 ` [PATCH v3 6/8] KVM: PPC: Book3S HV: Handle migration with POWER9 disabled DAWR Michael Neuling
2018-03-27  4:37 ` Michael Neuling [this message]
2018-03-27  4:37 ` [PATCH v3 8/8] powerpc: Disable DAWR in the base POWER9 CPU features Michael Neuling

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20180327043724.13862-8-mikey@neuling.org \
    --to=mikey@neuling.org \
    --cc=ananth@linux.vnet.ibm.com \
    --cc=david@gibson.dropbear.id.au \
    --cc=kvm-ppc@vger.kernel.org \
    --cc=linuxppc-dev@lists.ozlabs.org \
    --cc=mpe@ellerman.id.au \
    --cc=npiggin@gmail.com \
    --cc=paulus@ozlabs.org \
    --cc=pedromfc@linux.vnet.ibm.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).