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Wed, 25 Aug 2021 15:04:08 +0000 (GMT) From: Frederic Barrat To: skiboot@lists.ozlabs.org Date: Wed, 25 Aug 2021 17:04:08 +0200 Message-Id: <20210825150408.54367-1-fbarrat@linux.ibm.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: cHsZvz8deQAV1aZ2W1BIz_nsSIOzgiPQ X-Proofpoint-ORIG-GUID: cHsZvz8deQAV1aZ2W1BIz_nsSIOzgiPQ X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391, 18.0.790 definitions=2021-08-25_06:2021-08-25, 2021-08-25 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 clxscore=1011 phishscore=0 priorityscore=1501 spamscore=0 bulkscore=0 impostorscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 suspectscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2107140000 definitions=main-2108250092 Subject: [Skiboot-stable] [PATCH] phb4/5: Escalate page-level TCE kills X-BeenThere: skiboot-stable@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Patches, review, and discussion for stable releases of skiboot" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: skiboot-stable@lists.ozlabs.org Errors-To: skiboot-stable-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Skiboot-stable" An hw issue was found on P10 (HW560152) where a page-level TCE kill can be dropped if there are enough TCE kill requests already being processed. The net effect is that data integrity is not guaranteed. The circumvention is to stay away from page-level kills and escalate those to PE kills. Which hurts performance. It also affects P9. Signed-off-by: Frederic Barrat --- hw/phb4.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/hw/phb4.c b/hw/phb4.c index 79083d4a..ddaa18f8 100644 --- a/hw/phb4.c +++ b/hw/phb4.c @@ -1051,6 +1051,14 @@ static int64_t phb4_tce_kill(struct phb *phb, uint32_t kill_type, uint64_t val; int64_t rc; + /* + * HW560152: a page-level kill can be dropped if the + * processing queue is backed-up, which can cause data + * integrity issues + */ + if (kill_type == OPAL_PCI_TCE_KILL_PAGES) + kill_type = OPAL_PCI_TCE_KILL_PE; + sync(); switch(kill_type) { case OPAL_PCI_TCE_KILL_PAGES: