netdev - [PATCH v9 08/27] cxl: add functions for resource request/release by a driver

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Message-ID: <20241230214445.27602-9-alejandro.lucero-palau@amd.com>
Date: Mon, 30 Dec 2024 21:44:26 +0000
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 v9 08/27] 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>
Reviewed-by: Ben Cheatham <benjamin.cheatham@....com>
Reviewed-by: Zhi Wang <zhi@...dia.com>
Reviewed-by: Fan Ni <fan.ni@...sung.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
---
 drivers/cxl/core/memdev.c | 39 +++++++++++++++++++++++++++++++++++++++
 include/cxl/cxl.h         |  2 ++
 2 files changed, 41 insertions(+)

diff --git a/drivers/cxl/core/memdev.c b/drivers/cxl/core/memdev.c
index 99f533caae1e..b104af6761cf 100644
--- a/drivers/cxl/core/memdev.c
+++ b/drivers/cxl/core/memdev.c
@@ -744,6 +744,45 @@ 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)
+{
+	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;
+		}
+
+		return request_resource(&cxlds->dpa_res, &cxlds->ram_res);
+	case CXL_RES_PMEM:
+		if (!resource_size(&cxlds->pmem_res)) {
+			dev_err(cxlds->dev,
+				"resource request for pmem with size 0\n");
+			return -EINVAL;
+		}
+		return request_resource(&cxlds->dpa_res, &cxlds->pmem_res);
+	default:
+		dev_err(cxlds->dev, "unsupported resource type (%u)\n", type);
+		return -EINVAL;
+	}
+}
+EXPORT_SYMBOL_NS_GPL(cxl_request_resource, "CXL");
+
+int cxl_release_resource(struct cxl_dev_state *cxlds, enum cxl_resource type)
+{
+	switch (type) {
+	case CXL_RES_RAM:
+		return release_resource(&cxlds->ram_res);
+	case CXL_RES_PMEM:
+		return release_resource(&cxlds->pmem_res);
+	default:
+		dev_err(cxlds->dev, "unknown resource type (%u)\n", type);
+		return -EINVAL;
+	}
+}
+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/cxl/cxl.h b/include/cxl/cxl.h
index c1bb0359476c..87b192095fe3 100644
--- a/include/cxl/cxl.h
+++ b/include/cxl/cxl.h
@@ -45,4 +45,6 @@ bool cxl_pci_check_caps(struct cxl_dev_state *cxlds,
 			unsigned long *current_caps);
 struct pci_dev;
 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