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Thu, 12 Mar 2026 00:29:54 +0000 From: Dan Williams Date: Wed, 11 Mar 2026 17:29:52 -0700 To: Smita Koralahalli , , , , , CC: Ard Biesheuvel , Alison Schofield , Vishal Verma , "Ira Weiny" , Dan Williams , Jonathan Cameron , Yazen Ghannam , Dave Jiang , Davidlohr Bueso , Matthew Wilcox , Jan Kara , "Rafael J . Wysocki" , Len Brown , Pavel Machek , Li Ming , Jeff Johnson , "Ying Huang" , Yao Xingtao , Peter Zijlstra , Greg Kroah-Hartman , Nathan Fontenot , Terry Bowman , Robert Richter , Benjamin Cheatham , Zhijian Li , Borislav Petkov , Smita Koralahalli , Tomasz Wolski Message-ID: <69b20900be8df_213210055@dwillia2-mobl4.notmuch> In-Reply-To: <20260210064501.157591-7-Smita.KoralahalliChannabasappa@amd.com> References: <20260210064501.157591-1-Smita.KoralahalliChannabasappa@amd.com> <20260210064501.157591-7-Smita.KoralahalliChannabasappa@amd.com> Subject: Re: [PATCH v6 6/9] cxl/region: Add helper to check Soft Reserved containment by CXL regions Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: BYAPR11CA0104.namprd11.prod.outlook.com (2603:10b6:a03:f4::45) To PH8PR11MB8107.namprd11.prod.outlook.com (2603:10b6:510:256::6) Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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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: SVo5kDsPBCDVsjDQScjVN9EyfZKXDp0ljNQGwh2lKy0pWLUi1TzkQzj2TJmiotoiBPpep9nQpVDzZWqwVAMoTfYZZBgOXmLojTH1tFaS6ys= X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR11MB8774 X-OriginatorOrg: intel.com Smita Koralahalli wrote: > Add a helper to determine whether a given Soft Reserved memory range is > fully contained within the committed CXL region. > > This helper provides a primitive for policy decisions in subsequent > patches such as co-ordination with dax_hmem to determine whether CXL has > fully claimed ownership of Soft Reserved memory ranges. > > Signed-off-by: Smita Koralahalli > Reviewed-by: Jonathan Cameron > Reviewed-by: Dave Jiang > --- > drivers/cxl/core/region.c | 30 ++++++++++++++++++++++++++++++ > include/cxl/cxl.h | 15 +++++++++++++++ > 2 files changed, 45 insertions(+) > create mode 100644 include/cxl/cxl.h > > diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c > index 45ee598daf95..96ed550bfd2e 100644 > --- a/drivers/cxl/core/region.c > +++ b/drivers/cxl/core/region.c > @@ -12,6 +12,7 @@ > #include > #include > #include > +#include > #include > #include > #include "core.h" > @@ -3875,6 +3876,35 @@ static int cxl_region_debugfs_poison_clear(void *data, u64 offset) > DEFINE_DEBUGFS_ATTRIBUTE(cxl_poison_clear_fops, NULL, > cxl_region_debugfs_poison_clear, "%llx\n"); > > +static int region_contains_soft_reserve(struct device *dev, void *data) > +{ > + struct resource *res = data; > + struct cxl_region *cxlr; > + struct cxl_region_params *p; > + > + if (!is_cxl_region(dev)) > + return 0; > + > + cxlr = to_cxl_region(dev); > + p = &cxlr->params; > + > + if (p->state != CXL_CONFIG_COMMIT) > + return 0; > + > + if (!p->res) > + return 0; > + > + return resource_contains(p->res, res) ? 1 : 0; > +} > + > +bool cxl_region_contains_soft_reserve(struct resource *res) > +{ > + guard(rwsem_read)(&cxl_rwsem.region); > + return bus_for_each_dev(&cxl_bus_type, NULL, res, > + region_contains_soft_reserve) != 0; > +} > +EXPORT_SYMBOL_GPL(cxl_region_contains_soft_reserve); To be specific, this function is simply "cxl_region_contains_resource()", there is nothing "soft reserve" specific about this implementation. With that rename you can add: Reviewed-by: Dan Williams