netdev - [PATCH v18 18/20] sfc: create cxl region

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Message-ID: <20250918091746.2034285-19-alejandro.lucero-palau@amd.com>
Date: Thu, 18 Sep 2025 10:17:44 +0100
From: <alejandro.lucero-palau@....com>
To: <linux-cxl@...r.kernel.org>, <netdev@...r.kernel.org>,
	<dan.j.williams@...el.com>, <edward.cree@....com>, <davem@...emloft.net>,
	<kuba@...nel.org>, <pabeni@...hat.com>, <edumazet@...gle.com>,
	<dave.jiang@...el.com>
CC: Alejandro Lucero <alucerop@....com>
Subject: [PATCH v18 18/20] sfc: create cxl region

From: Alejandro Lucero <alucerop@....com>

Use cxl api for creating a region using the endpoint decoder related to
a DPA range.

Add a callback for unwinding sfc cxl initialization when the endpoint port
is destroyed by potential cxl_acpi or cxl_mem modules removal.

Signed-off-by: Alejandro Lucero <alucerop@....com>
---
 drivers/cxl/core/core.h            |  5 -----
 drivers/net/ethernet/sfc/efx_cxl.c | 22 ++++++++++++++++++++++
 include/cxl/cxl.h                  |  8 ++++++++
 3 files changed, 30 insertions(+), 5 deletions(-)

diff --git a/drivers/cxl/core/core.h b/drivers/cxl/core/core.h
index c4dddbec5d6e..83abaca9f418 100644
--- a/drivers/cxl/core/core.h
+++ b/drivers/cxl/core/core.h
@@ -14,11 +14,6 @@ extern const struct device_type cxl_pmu_type;
 
 extern struct attribute_group cxl_base_attribute_group;
 
-enum cxl_detach_mode {
-	DETACH_ONLY,
-	DETACH_INVALIDATE,
-};
-
 #ifdef CONFIG_CXL_REGION
 extern struct device_attribute dev_attr_create_pmem_region;
 extern struct device_attribute dev_attr_create_ram_region;
diff --git a/drivers/net/ethernet/sfc/efx_cxl.c b/drivers/net/ethernet/sfc/efx_cxl.c
index 4461b7a4dc2c..85490afc7930 100644
--- a/drivers/net/ethernet/sfc/efx_cxl.c
+++ b/drivers/net/ethernet/sfc/efx_cxl.c
@@ -14,6 +14,16 @@
 
 #define EFX_CTPIO_BUFFER_SIZE	SZ_256M
 
+static void efx_release_cxl_region(void *priv_cxl)
+{
+	struct efx_probe_data *probe_data = priv_cxl;
+	struct efx_cxl *cxl = probe_data->cxl;
+
+	probe_data->cxl_pio_initialised = false;
+	iounmap(cxl->ctpio_cxl);
+	cxl_put_root_decoder(cxl->cxlrd);
+}
+
 int efx_cxl_init(struct efx_probe_data *probe_data)
 {
 	struct efx_nic *efx = &probe_data->efx;
@@ -118,6 +128,16 @@ int efx_cxl_init(struct efx_probe_data *probe_data)
 		goto err_decoder;
 	}
 
+	cxl->efx_region = cxl_create_region(cxl->cxlrd, &cxl->cxled, 1,
+					    efx_release_cxl_region,
+					    &probe_data);
+	if (IS_ERR(cxl->efx_region)) {
+		pci_err(pci_dev, "CXL accel create region failed");
+		cxl_dpa_free(cxl->cxled);
+		rc = PTR_ERR(cxl->efx_region);
+		goto err_decoder;
+	}
+
 	probe_data->cxl = cxl;
 
 	cxl_release_endpoint(cxl->cxlmd, cxl->endpoint);
@@ -135,6 +155,8 @@ int efx_cxl_init(struct efx_probe_data *probe_data)
 void efx_cxl_exit(struct efx_probe_data *probe_data)
 {
 	if (probe_data->cxl) {
+		cxl_decoder_detach(NULL, probe_data->cxl->cxled, 0,
+				   DETACH_INVALIDATE);
 		cxl_dpa_free(probe_data->cxl->cxled);
 		cxl_put_root_decoder(probe_data->cxl->cxlrd);
 	}
diff --git a/include/cxl/cxl.h b/include/cxl/cxl.h
index dbacefff8d60..e82f94921b5b 100644
--- a/include/cxl/cxl.h
+++ b/include/cxl/cxl.h
@@ -282,4 +282,12 @@ struct cxl_region *cxl_create_region(struct cxl_root_decoder *cxlrd,
 				     struct cxl_endpoint_decoder **cxled,
 				     int ways, void (*action)(void *),
 				     void *data);
+enum cxl_detach_mode {
+	DETACH_ONLY,
+	DETACH_INVALIDATE,
+};
+
+int cxl_decoder_detach(struct cxl_region *cxlr,
+		       struct cxl_endpoint_decoder *cxled, int pos,
+		       enum cxl_detach_mode mode);
 #endif /* __CXL_CXL_H__ */
-- 
2.34.1