linux-kernel - [PATCH v2 4/5] cxl/mem: Reserve individual register block regions

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Date:   Fri, 21 May 2021 17:11:53 -0700
From:   ira.weiny@...el.com
To:     Ben Widawsky <ben.widawsky@...el.com>,
        Dan Williams <dan.j.williams@...el.com>
Cc:     Ira Weiny <ira.weiny@...el.com>,
        Alison Schofield <alison.schofield@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        linux-cxl@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 4/5] cxl/mem: Reserve individual register block regions

From: Ira Weiny <ira.weiny@...el.com>

Now that individual register blocks are mapped; those blocks regions
should be reserved individually.

Remove general pci device management and create managed region
reservations based on the individual register blocks.

Signed-off-by: Ira Weiny <ira.weiny@...el.com>

---
Changes for V2:
	New patch
---
 drivers/cxl/core.c | 36 ++++++++++++++++++++++++++++++++----
 drivers/cxl/pci.c  |  6 ++----
 2 files changed, 34 insertions(+), 8 deletions(-)

diff --git a/drivers/cxl/core.c b/drivers/cxl/core.c
index add66a6ec875..ae38f17be1e7 100644
--- a/drivers/cxl/core.c
+++ b/drivers/cxl/core.c
@@ -74,11 +74,33 @@ void cxl_probe_device_regs(struct device *dev, void __iomem *base,
 }
 EXPORT_SYMBOL_GPL(cxl_probe_device_regs);
 
+static void __iomem *cxl_ioremap_block(struct pci_dev *pdev,
+				       resource_size_t addr,
+				       resource_size_t length)
+{
+	struct device *dev = &pdev->dev;
+	void __iomem *ret_val;
+	struct resource *res;
+
+	res = devm_request_mem_region(dev, addr, length, pci_name(pdev));
+	if (!res) {
+		dev_err(dev, "Failed to request region %#llx-%#llx\n",
+			addr, addr+length);
+		return NULL;
+	}
+
+	ret_val = devm_ioremap(dev, addr, length);
+	if (!ret_val)
+		dev_err(dev, "Failed to map region %#llx-%#llx\n",
+			addr, addr+length);
+
+	return ret_val;
+}
+
 int cxl_map_device_regs(struct pci_dev *pdev,
 			struct cxl_device_regs *regs,
 			struct cxl_register_map *map)
 {
-	struct device *dev = &pdev->dev;
 	resource_size_t phys_addr;
 
 	phys_addr = pci_resource_start(pdev, map->barno);
@@ -90,7 +112,9 @@ int cxl_map_device_regs(struct pci_dev *pdev,
 
 		addr = phys_addr + map->device_map.status.offset;
 		length = map->device_map.status.size;
-		regs->status = devm_ioremap(dev, addr, length);
+		regs->status = cxl_ioremap_block(pdev, addr, length);
+		if (!regs->status)
+			return -ENOMEM;
 	}
 
 	if (map->device_map.mbox.valid) {
@@ -99,7 +123,9 @@ int cxl_map_device_regs(struct pci_dev *pdev,
 
 		addr = phys_addr + map->device_map.mbox.offset;
 		length = map->device_map.mbox.size;
-		regs->mbox = devm_ioremap(dev, addr, length);
+		regs->mbox = cxl_ioremap_block(pdev, addr, length);
+		if (!regs->mbox)
+			return -ENOMEM;
 	}
 
 	if (map->device_map.memdev.valid) {
@@ -108,7 +134,9 @@ int cxl_map_device_regs(struct pci_dev *pdev,
 
 		addr = phys_addr + map->device_map.memdev.offset;
 		length = map->device_map.memdev.size;
-		regs->memdev = devm_ioremap(dev, addr, length);
+		regs->memdev = cxl_ioremap_block(pdev, addr, length);
+		if (!regs->memdev)
+			return -ENOMEM;
 	}
 
 	return 0;
diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c
index 3ffd5fad74b4..776cb8e28c2d 100644
--- a/drivers/cxl/pci.c
+++ b/drivers/cxl/pci.c
@@ -1110,6 +1110,8 @@ static int cxl_mem_setup_regs(struct cxl_mem *cxlm)
 			goto free_maps;
 	}
 
+	pci_release_mem_regions(pdev);
+
 	list_for_each_entry(map, &register_maps, list) {
 		ret = cxl_map_regs(cxlm, map);
 		if (ret)
@@ -1547,10 +1549,6 @@ static int cxl_mem_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	struct cxl_mem *cxlm;
 	int rc;
 
-	rc = pcim_enable_device(pdev);
-	if (rc)
-		return rc;
-
 	cxlm = cxl_mem_create(pdev);
 	if (IS_ERR(cxlm))
 		return PTR_ERR(cxlm);
-- 
2.28.0.rc0.12.gb6a658bd00c9