netdev - [PATCH v3 06/20] cxl: add functions for resource request/release by a driver

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Message-ID: <20240907081836.5801-7-alejandro.lucero-palau@amd.com>
Date: Sat, 7 Sep 2024 09:18:22 +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 06/20] cxl: add functions for resource request/release by a driver

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

Create accessors for an accel driver requesting and
releaseing a resource.

Signed-off-by: Alejandro Lucero <alucerop@....com>
---
 drivers/cxl/core/memdev.c          | 40 ++++++++++++++++++++++++++++++
 drivers/net/ethernet/sfc/efx_cxl.c |  7 ++++++
 include/linux/cxl/cxl.h            |  2 ++
 3 files changed, 49 insertions(+)

diff --git a/drivers/cxl/core/memdev.c b/drivers/cxl/core/memdev.c
index 10c0a6990f9a..a7d8daf4a59b 100644
--- a/drivers/cxl/core/memdev.c
+++ b/drivers/cxl/core/memdev.c
@@ -744,6 +744,46 @@ int cxl_set_resource(struct cxl_dev_state *cxlds, struct resource res,
 }
 EXPORT_SYMBOL_NS_GPL(cxl_set_resource, CXL);
 
+int cxl_request_resource(struct cxl_dev_state *cxlds, enum cxl_resource type)
+{
+	int rc;
+
+	switch (type) {
+	case CXL_ACCEL_RES_RAM:
+		rc = request_resource(&cxlds->dpa_res, &cxlds->ram_res);
+		break;
+	case CXL_ACCEL_RES_PMEM:
+		rc = request_resource(&cxlds->dpa_res, &cxlds->pmem_res);
+		break;
+	default:
+		dev_err(cxlds->dev, "unknown resource type (%u)\n", type);
+		return -EINVAL;
+	}
+
+	return rc;
+}
+EXPORT_SYMBOL_NS_GPL(cxl_request_resource, CXL);
+
+int cxl_release_resource(struct cxl_dev_state *cxlds, enum cxl_resource type)
+{
+	int rc;
+
+	switch (type) {
+	case CXL_ACCEL_RES_RAM:
+		rc = release_resource(&cxlds->ram_res);
+		break;
+	case CXL_ACCEL_RES_PMEM:
+		rc = release_resource(&cxlds->pmem_res);
+		break;
+	default:
+		dev_err(cxlds->dev, "unknown resource type (%u)\n", type);
+		return -EINVAL;
+	}
+
+	return rc;
+}
+EXPORT_SYMBOL_NS_GPL(cxl_release_resource, 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 fee143e94c1f..80259c8317fd 100644
--- a/drivers/net/ethernet/sfc/efx_cxl.c
+++ b/drivers/net/ethernet/sfc/efx_cxl.c
@@ -72,6 +72,12 @@ int efx_cxl_init(struct efx_nic *efx)
 		goto err;
 	}
 
+	rc = cxl_request_resource(cxl->cxlds, CXL_ACCEL_RES_RAM);
+	if (rc) {
+		pci_err(pci_dev, "CXL request resource failed");
+		goto err;
+	}
+
 	return 0;
 err:
 	kfree(cxl->cxlds);
@@ -84,6 +90,7 @@ int efx_cxl_init(struct efx_nic *efx)
 void efx_cxl_exit(struct efx_nic *efx)
 {
 	if (efx->cxl) {
+		cxl_release_resource(efx->cxl->cxlds, CXL_ACCEL_RES_RAM);
 		kfree(efx->cxl->cxlds);
 		kfree(efx->cxl);
 	}
diff --git a/include/linux/cxl/cxl.h b/include/linux/cxl/cxl.h
index f2dcba6cdc22..22912b2d9bb2 100644
--- a/include/linux/cxl/cxl.h
+++ b/include/linux/cxl/cxl.h
@@ -52,4 +52,6 @@ int cxl_set_resource(struct cxl_dev_state *cxlds, struct resource res,
 bool cxl_pci_check_caps(struct cxl_dev_state *cxlds, u32 expected_caps,
 			u32 *current_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);
 #endif
-- 
2.17.1