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X-MS-Exchange-CrossTenant-Network-Message-Id: aaf9a0ae-e869-4f00-ccca-08de4c955dfe X-MS-Exchange-CrossTenant-AuthSource: MN6PR11MB8146.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Jan 2026 20:02:34.6315 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: qlePW8hMqmJRWeLR80+UvfQDs5YFVvuDdvZMvUBopuyryS5R73lpb58lYH5hSPN1A9HJ42UaC5jT87cOEDXBIasdtmHFA8NcVXUkURuhxDs= X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM3PPF453C3BEC4 X-OriginatorOrg: intel.com X-BeenThere: intel-xe@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel Xe graphics driver List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-xe-bounces@lists.freedesktop.org Sender: "Intel-xe" On 05/01/2026 20:54, Gustavo Sousa wrote: > Quoting Lionel Landwerlin (2026-01-05 12:02:22-03:00) >> Similar to i915's commit cebc13de7e704b1355bea208a9f9cdb042c74588 >> ("drm/i915: Whitelist COMMON_SLICE_CHICKEN3 for UMD access") >> >> A recommended tuning setting for both gen12 and Xe_HP platforms >> requires that we grant userspace r/w access to the >> COMMON_SLICE_CHICKEN3 register. >> >> Bspec: 73993, 73994, 31870, 68331 >> Signed-off-by: Lionel Landwerlin >> --- >> drivers/gpu/drm/xe/xe_reg_whitelist.c | 5 +++++ >> 1 file changed, 5 insertions(+) >> >> diff --git a/drivers/gpu/drm/xe/xe_reg_whitelist.c b/drivers/gpu/drm/xe/xe_reg_whitelist.c >> index 1391cb6ec9c62..4dcbc42574bf5 100644 >> --- a/drivers/gpu/drm/xe/xe_reg_whitelist.c >> +++ b/drivers/gpu/drm/xe/xe_reg_whitelist.c >> @@ -45,6 +45,11 @@ static const struct xe_rtp_entry_sr register_whitelist[] = { >> XE_RTP_RULES(GRAPHICS_VERSION_RANGE(1200, 1210), ENGINE_CLASS(RENDER)), >> XE_RTP_ACTIONS(WHITELIST(COMMON_SLICE_CHICKEN1, 0)) >> }, >> + { XE_RTP_NAME("allow_common_slice_chicken3"), >> + XE_RTP_RULES(GRAPHICS_VERSION_RANGE(1200, XE_RTP_END_VERSION_UNDEFINED), > With XE_RTP_END_VERSION_UNDEFINED, this spans to any current and future > GT containig graphics version 12 or higher. I believe we need to limit > this to 12.74. > > -- > Gustavo Sousa The problem is that UMD still wants to enable this performance feature from this register. On Windows there is a way for the UMD to request the programming of the bit without the allowlist on Xe2+. But there is no such mechanism on Linux. -Lionel > >> + ENGINE_CLASS(RENDER)), >> + XE_RTP_ACTIONS(WHITELIST(COMMON_SLICE_CHICKEN3, 0)) >> + }, >> { XE_RTP_NAME("1806527549"), >> XE_RTP_RULES(GRAPHICS_VERSION_RANGE(1200, 1210), ENGINE_CLASS(RENDER)), >> XE_RTP_ACTIONS(WHITELIST(HIZ_CHICKEN, 0)) >> -- >> 2.43.0 >>