netdev - [PATCH v2 06/15] cxl: add function for setting media ready by an accelerator

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Message-ID: <20240715172835.24757-7-alejandro.lucero-palau@amd.com>
Date: Mon, 15 Jul 2024 18:28:26 +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>, <richard.hughes@....com>
CC: Alejandro Lucero <alucerop@....com>
Subject: [PATCH v2 06/15] cxl: add function for setting media ready by an accelerator

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          | 7 ++++++-
 drivers/net/ethernet/sfc/efx_cxl.c | 5 +++++
 include/linux/cxl_accel_mem.h      | 2 ++
 3 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/cxl/core/memdev.c b/drivers/cxl/core/memdev.c
index b4205ecca365..58a51e7fd37f 100644
--- a/drivers/cxl/core/memdev.c
+++ b/drivers/cxl/core/memdev.c
@@ -714,7 +714,6 @@ static int cxl_memdev_open(struct inode *inode, struct file *file)
 	return 0;
 }
 
-
 void cxl_accel_set_dvsec(struct cxl_dev_state *cxlds, u16 dvsec)
 {
 	cxlds->cxl_dvsec = dvsec;
@@ -759,6 +758,12 @@ int cxl_accel_request_resource(struct cxl_dev_state *cxlds, bool is_ram)
 }
 EXPORT_SYMBOL_NS_GPL(cxl_accel_request_resource, CXL);
 
+void cxl_accel_set_media_ready(struct cxl_dev_state *cxlds)
+{
+	cxlds->media_ready = true;
+}
+EXPORT_SYMBOL_NS_GPL(cxl_accel_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 37d8bfdef517..a84fe7992c53 100644
--- a/drivers/net/ethernet/sfc/efx_cxl.c
+++ b/drivers/net/ethernet/sfc/efx_cxl.c
@@ -56,6 +56,11 @@ void efx_cxl_init(struct efx_nic *efx)
 
 	if (cxl_accel_request_resource(cxl->cxlds, true))
 		pci_info(pci_dev, "CXL accel resource request failed");
+
+	if (!cxl_await_media_ready(cxl->cxlds))
+		cxl_accel_set_media_ready(cxl->cxlds);
+	else
+		pci_info(pci_dev, "CXL accel media not active");
 }
 
 
diff --git a/include/linux/cxl_accel_mem.h b/include/linux/cxl_accel_mem.h
index 0ba2195b919b..b883c438a132 100644
--- a/include/linux/cxl_accel_mem.h
+++ b/include/linux/cxl_accel_mem.h
@@ -24,4 +24,6 @@ void cxl_accel_set_resource(struct cxl_dev_state *cxlds, struct resource res,
 			    enum accel_resource);
 int cxl_pci_accel_setup_regs(struct pci_dev *pdev, struct cxl_dev_state *cxlds);
 int cxl_accel_request_resource(struct cxl_dev_state *cxlds, bool is_ram);
+void cxl_accel_set_media_ready(struct cxl_dev_state *cxlds);
+int cxl_await_media_ready(struct cxl_dev_state *cxlds);
 #endif
-- 
2.17.1