diff mbox series

[v7,08/28] cxl: add functions for resource request/release by a driver

Message ID 20241209185429.54054-9-alejandro.lucero-palau@amd.com (mailing list archive)
State Superseded
Headers show
Series cxl: add type2 device basic support | expand

Checks

Context Check Description
netdev/series_format fail Series longer than 15 patches
netdev/tree_selection success Guessed tree name to be net-next
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 0 this patch: 0
netdev/build_tools success Errors and warnings before: 0 (+23) this patch: 0 (+23)
netdev/cc_maintainers warning 6 maintainers not CCed: ira.weiny@intel.com alison.schofield@intel.com vishal.l.verma@intel.com jonathan.cameron@huawei.com fan.ni@samsung.com dave@stgolabs.net
netdev/build_clang success Errors and warnings before: 0 this patch: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 1 this patch: 1
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 57 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Lucero Palau, Alejandro Dec. 9, 2024, 6:54 p.m. UTC 
From: Alejandro Lucero <alucerop@amd.com>

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

Signed-off-by: Alejandro Lucero <alucerop@amd.com>
Reviewed-by: Ben Cheatham <benjamin.cheatham@amd.com>
Reviewed-by: Zhi Wang <zhi@nvidia.com>
Reviewed-by: Fan Ni <fan.ni@samsung.com>
---
 drivers/cxl/core/memdev.c | 45 +++++++++++++++++++++++++++++++++++++++
 include/cxl/cxl.h         |  2 ++
 2 files changed, 47 insertions(+)
diff mbox series

Patch

diff --git a/drivers/cxl/core/memdev.c b/drivers/cxl/core/memdev.c
index 99f533caae1e..c414b0fbbead 100644
--- a/drivers/cxl/core/memdev.c
+++ b/drivers/cxl/core/memdev.c
@@ -744,6 +744,51 @@  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)
+{
+	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/cxl/cxl.h b/include/cxl/cxl.h
index 18fb01adcf19..44664c9928a4 100644
--- a/include/cxl/cxl.h
+++ b/include/cxl/cxl.h
@@ -42,4 +42,6 @@  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