netdev - [PATCH v3 08/20] cxl: add function for setting media ready by a driver

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Message-ID: <20240907081836.5801-9-alejandro.lucero-palau@amd.com>
Date: Sat, 7 Sep 2024 09:18:24 +0100
From: <alejandro.lucero-palau@....com>
To: <linux-cxl@...r.kernel.org>, <netdev@...r.kernel.org>,
	<dan.j.williams@...el.com>, <martin.habets@...inx.com>,
	<edward.cree@....com>, <davem@...emloft.net>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <edumazet@...gle.com>
CC: Alejandro Lucero <alucerop@....com>
Subject: [PATCH v3 08/20] cxl: add function for setting media ready by a driver

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

A Type-2 driver can require to set the memory availability explicitly.

Add a function to the exported CXL API for accelerator drivers.

Signed-off-by: Alejandro Lucero <alucerop@....com>
---
 drivers/cxl/core/memdev.c          | 6 ++++++
 drivers/net/ethernet/sfc/efx_cxl.c | 5 +++++
 include/linux/cxl/cxl.h            | 1 +
 3 files changed, 12 insertions(+)

diff --git a/drivers/cxl/core/memdev.c b/drivers/cxl/core/memdev.c
index a7d8daf4a59b..836faf09b328 100644
--- a/drivers/cxl/core/memdev.c
+++ b/drivers/cxl/core/memdev.c
@@ -784,6 +784,12 @@ int cxl_release_resource(struct cxl_dev_state *cxlds, enum cxl_resource type)
 }
 EXPORT_SYMBOL_NS_GPL(cxl_release_resource, CXL);
 
+void cxl_set_media_ready(struct cxl_dev_state *cxlds)
+{
+	cxlds->media_ready = true;
+}
+EXPORT_SYMBOL_NS_GPL(cxl_set_media_ready, CXL);
+
 static int cxl_memdev_release_file(struct inode *inode, struct file *file)
 {
 	struct cxl_memdev *cxlmd =
diff --git a/drivers/net/ethernet/sfc/efx_cxl.c b/drivers/net/ethernet/sfc/efx_cxl.c
index 80259c8317fd..14fab41fe10a 100644
--- a/drivers/net/ethernet/sfc/efx_cxl.c
+++ b/drivers/net/ethernet/sfc/efx_cxl.c
@@ -78,6 +78,11 @@ int efx_cxl_init(struct efx_nic *efx)
 		goto err;
 	}
 
+	/* We do not have the register about media status. Hardware design
+	 * implies it is ready.
+	 */
+	cxl_set_media_ready(cxl->cxlds);
+
 	return 0;
 err:
 	kfree(cxl->cxlds);
diff --git a/include/linux/cxl/cxl.h b/include/linux/cxl/cxl.h
index 22912b2d9bb2..08723b2d75bc 100644
--- a/include/linux/cxl/cxl.h
+++ b/include/linux/cxl/cxl.h
@@ -54,4 +54,5 @@ bool cxl_pci_check_caps(struct cxl_dev_state *cxlds, u32 expected_caps,
 int cxl_pci_accel_setup_regs(struct pci_dev *pdev, struct cxl_dev_state *cxlds);
 int cxl_request_resource(struct cxl_dev_state *cxlds, enum cxl_resource type);
 int cxl_release_resource(struct cxl_dev_state *cxlds, enum cxl_resource type);
+void cxl_set_media_ready(struct cxl_dev_state *cxlds);
 #endif
-- 
2.17.1