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[173.79.56.208]) by smtp.gmail.com with ESMTPSA id af79cd13be357-7b9ac478e33sm1601045985a.76.2025.01.07.09.23.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 07 Jan 2025 09:23:28 -0800 (PST) Date: Tue, 7 Jan 2025 12:23:26 -0500 From: Gregory Price To: Robert Richter Cc: Alison Schofield , Vishal Verma , Ira Weiny , Dan Williams , Jonathan Cameron , Dave Jiang , Davidlohr Bueso , linux-cxl@vger.kernel.org, linux-kernel@vger.kernel.org, "Fabio M. De Francesco" , Terry Bowman Subject: Re: [PATCH v1 09/29] cxl/region: Use iterator to find the root port in cxl_find_root_decoder() Message-ID: References: <20250107141015.3367194-1-rrichter@amd.com> <20250107141015.3367194-10-rrichter@amd.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250107141015.3367194-10-rrichter@amd.com> On Tue, Jan 07, 2025 at 03:09:55PM +0100, Robert Richter wrote: > The function cxl_find_root_decoder() uses find_cxl_root() to find the > root port. For the implementation of support of address translation an > iterator is needed that traverses all ports from the endpoint to the > root port. > > Use the iterator in find_cxl_root() and unfold it into > cxl_find_root_decoder(). > > Signed-off-by: Robert Richter > --- > drivers/cxl/core/region.c | 11 ++++++++--- > 1 file changed, 8 insertions(+), 3 deletions(-) > I wonder if we can expose this mapping in the sysfs hierarchy, because I've always been frustrated about how confusing what decoders/endpoints relate to each other. (I say this not looking forward in the series to see if you did exactly this, just spitballing) Reviewed-by: Gregory Price > diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c > index 5132c689b1f2..5750ed2796a8 100644 > --- a/drivers/cxl/core/region.c > +++ b/drivers/cxl/core/region.c > @@ -3206,13 +3206,18 @@ static struct cxl_root_decoder * > cxl_find_root_decoder(struct cxl_endpoint_decoder *cxled) > { > struct cxl_memdev *cxlmd = cxled_to_memdev(cxled); > - struct cxl_port *port = cxled_to_port(cxled); > - struct cxl_root *cxl_root __free(put_cxl_root) = find_cxl_root(port); > + struct cxl_port *iter = cxled_to_port(cxled); > struct range *hpa = &cxled->cxld.hpa_range; > struct cxl_decoder *cxld = &cxled->cxld; > struct device *cxlrd_dev; > > - cxlrd_dev = device_find_child(&cxl_root->port.dev, hpa, > + while (iter && !is_cxl_root(iter)) > + iter = to_cxl_port(iter->dev.parent); > + > + if (!iter) > + return NULL; > + > + cxlrd_dev = device_find_child(&iter->dev, hpa, > match_root_decoder_by_range); > if (!cxlrd_dev) { > dev_err(cxlmd->dev.parent, > -- > 2.39.5 >