netdev - [PATCH v4 08/26] cxl: add functions for resource request/release by a driver

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Message-ID: <20241017165225.21206-9-alejandro.lucero-palau@amd.com>
Date: Thu, 17 Oct 2024 17:52:07 +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 v4 08/26] cxl: add functions for resource request/release by a driver

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

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

Signed-off-by: Alejandro Lucero <alucerop@....com>
---
 drivers/cxl/core/memdev.c | 51 +++++++++++++++++++++++++++++++++++++++
 include/linux/cxl/cxl.h   |  2 ++
 2 files changed, 53 insertions(+)

diff --git a/drivers/cxl/core/memdev.c b/drivers/cxl/core/memdev.c
index 94b8a7b53c92..4b2641f20128 100644
--- a/drivers/cxl/core/memdev.c
+++ b/drivers/cxl/core/memdev.c
@@ -744,6 +744,57 @@ 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_RES_RAM:
+		if (!resource_size(&cxlds->ram_res)) {
+			dev_err(cxlds->dev,
+				"resource request for ram with size 0\n");
+			return -EINVAL;
+		}
+
+		rc = request_resource(&cxlds->dpa_res, &cxlds->ram_res);
+		break;
+	case CXL_RES_PMEM:
+		if (!resource_size(&cxlds->pmem_res)) {
+			dev_err(cxlds->dev,
+				"resource request for pmem with size 0\n");
+			return -EINVAL;
+		}
+		rc = request_resource(&cxlds->dpa_res, &cxlds->pmem_res);
+		break;
+	default:
+		dev_err(cxlds->dev, "unsupported 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_RES_RAM:
+		rc = release_resource(&cxlds->ram_res);
+		break;
+	case CXL_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/include/linux/cxl/cxl.h b/include/linux/cxl/cxl.h
index 2f48ee591259..6c6d27721067 100644
--- a/include/linux/cxl/cxl.h
+++ b/include/linux/cxl/cxl.h
@@ -54,4 +54,6 @@ bool cxl_pci_check_caps(struct cxl_dev_state *cxlds,
 			unsigned long *expected_caps,
 			unsigned long *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