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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 May 2023 18:31:41.2366 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8aae599c-cc78-458d-35db-08db5184cca2 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT059.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA1PR12MB7246 On Wed, May 10, 2023 at 11:12:05AM -0700, Nicolin Chen wrote: > On Wed, May 10, 2023 at 04:38:44PM +0100, Robin Murphy wrote: > > > To work around MMU-700 erratum 2812531 we need to ensure that certain > > sequences of commands cannot be issued without an intervening sync. In > > practice this falls out of our current command-batching machinery > > anyway - each batch only contains a single type of invalidation command, > > Hmm. This doesn't apply to the user cache invalidation solution > in my v2. A user cmdq could possibly mix different commands in > a single batch if the driver isn't aware of such an errata. So, > I think I'd need some twist when the host has a FORCE_SYNC flag > in my v3. Just found that you unset the NESTING feature flag in PATCH-4 for this errata too. So, the solution in my v2 should be safe. Thanks Nicolin