add boot partition size

hc

2023-12-11 d2ccde1c8e90d38cee87a1b0309ad2827f3fd30d

 kernel/drivers/soc/qcom/rmtfs_mem.c
..
..
@@ -1,14 +1,6 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Copyright (c) 2017 Linaro Ltd.
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 and
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- * only version 2 as published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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4
  */
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5
 
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 #include <linux/kernel.h>
..
..
@@ -45,9 +37,9 @@
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 			      struct device_attribute *attr,
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 			      char *buf);
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39
 
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-static DEVICE_ATTR(phys_addr, 0400, qcom_rmtfs_mem_show, NULL);
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-static DEVICE_ATTR(size, 0400, qcom_rmtfs_mem_show, NULL);
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-static DEVICE_ATTR(client_id, 0400, qcom_rmtfs_mem_show, NULL);
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+static DEVICE_ATTR(phys_addr, 0444, qcom_rmtfs_mem_show, NULL);
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+static DEVICE_ATTR(size, 0444, qcom_rmtfs_mem_show, NULL);
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+static DEVICE_ATTR(client_id, 0444, qcom_rmtfs_mem_show, NULL);
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43
 
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 static ssize_t qcom_rmtfs_mem_show(struct device *dev,
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 			      struct device_attribute *attr,
..
..
@@ -132,6 +124,31 @@
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 	return 0;
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 }
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126
 
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+static struct class rmtfs_class = {
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+	.owner          = THIS_MODULE,
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+	.name           = "rmtfs",
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+};
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+
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+static int qcom_rmtfs_mem_mmap(struct file *filep, struct vm_area_struct *vma)
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+{
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+	struct qcom_rmtfs_mem *rmtfs_mem = filep->private_data;
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+
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+	if (vma->vm_end - vma->vm_start > rmtfs_mem->size) {
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+		dev_dbg(&rmtfs_mem->dev,
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+			"vm_end[%lu] - vm_start[%lu] [%lu] > mem->size[%pa]\n",
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+			vma->vm_end, vma->vm_start,
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+			(vma->vm_end - vma->vm_start), &rmtfs_mem->size);
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+		return -EINVAL;
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+	}
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+
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+	vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
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+	return remap_pfn_range(vma,
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+			       vma->vm_start,
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+			       rmtfs_mem->addr >> PAGE_SHIFT,
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+			       vma->vm_end - vma->vm_start,
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+			       vma->vm_page_prot);
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+}
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+
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 static const struct file_operations qcom_rmtfs_mem_fops = {
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 	.owner = THIS_MODULE,
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 	.open = qcom_rmtfs_mem_open,
..
..
@@ -139,6 +156,7 @@
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 	.write = qcom_rmtfs_mem_write,
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 	.release = qcom_rmtfs_mem_release,
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 	.llseek = default_llseek,
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+	.mmap = qcom_rmtfs_mem_mmap,
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160
 };
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161
 
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 static void qcom_rmtfs_mem_release_device(struct device *dev)
..
..
@@ -199,6 +217,7 @@
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217
 
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 	dev_set_name(&rmtfs_mem->dev, "qcom_rmtfs_mem%d", client_id);
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 	rmtfs_mem->dev.id = client_id;
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+	rmtfs_mem->dev.class = &rmtfs_class;
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 	rmtfs_mem->dev.devt = MKDEV(MAJOR(qcom_rmtfs_mem_major), client_id);
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222
 
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 	ret = cdev_device_add(&rmtfs_mem->cdev, &rmtfs_mem->dev);
..
..
@@ -277,32 +296,42 @@
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 	},
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 };
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298
 
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-static int qcom_rmtfs_mem_init(void)
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+static int __init qcom_rmtfs_mem_init(void)
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 {
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 	int ret;
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+
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+	ret = class_register(&rmtfs_class);
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+	if (ret)
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+		return ret;
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306
 
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 	ret = alloc_chrdev_region(&qcom_rmtfs_mem_major, 0,
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 				  QCOM_RMTFS_MEM_DEV_MAX, "qcom_rmtfs_mem");
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 	if (ret < 0) {
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 		pr_err("qcom_rmtfs_mem: failed to allocate char dev region\n");
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-		return ret;
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+		goto unregister_class;
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 	}
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 	ret = platform_driver_register(&qcom_rmtfs_mem_driver);
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 	if (ret < 0) {
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 		pr_err("qcom_rmtfs_mem: failed to register rmtfs_mem driver\n");
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-		unregister_chrdev_region(qcom_rmtfs_mem_major,
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-					 QCOM_RMTFS_MEM_DEV_MAX);
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+		goto unregister_chrdev;
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 	}
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319
 
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+	return 0;
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+
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+unregister_chrdev:
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+	unregister_chrdev_region(qcom_rmtfs_mem_major, QCOM_RMTFS_MEM_DEV_MAX);
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+unregister_class:
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+	class_unregister(&rmtfs_class);
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 	return ret;
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 }
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 module_init(qcom_rmtfs_mem_init);
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329
 
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-static void qcom_rmtfs_mem_exit(void)
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+static void __exit qcom_rmtfs_mem_exit(void)
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 {
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 	platform_driver_unregister(&qcom_rmtfs_mem_driver);
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 	unregister_chrdev_region(qcom_rmtfs_mem_major, QCOM_RMTFS_MEM_DEV_MAX);
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+	class_unregister(&rmtfs_class);
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 }
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 module_exit(qcom_rmtfs_mem_exit);
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