cregit-Linux how code gets into the kernel

Release 4.14 drivers/sh/intc/userimask.c

Directory: drivers/sh/intc
/*
 * Support for hardware-assisted userspace interrupt masking.
 *
 * Copyright (C) 2010  Paul Mundt
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */

#define pr_fmt(fmt) "intc: " fmt

#include <linux/errno.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/stat.h>
#include <asm/sizes.h>
#include "internals.h"


static void __iomem *uimask;


static ssize_t show_intc_userimask(struct device *dev, struct device_attribute *attr, char *buf) { return sprintf(buf, "%d\n", (__raw_readl(uimask) >> 4) & 0xf); }

Contributors

PersonTokensPropCommitsCommitProp
Paul Mundt3692.31%150.00%
Kay Sievers37.69%150.00%
Total39100.00%2100.00%


static ssize_t store_intc_userimask(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { unsigned long level; level = simple_strtoul(buf, NULL, 10); /* * Minimal acceptable IRQ levels are in the 2 - 16 range, but * these are chomped so as to not interfere with normal IRQs. * * Level 1 is a special case on some CPUs in that it's not * directly settable, but given that USERIMASK cuts off below a * certain level, we don't care about this limitation here. * Level 0 on the other hand equates to user masking disabled. * * We use the default priority level as a cut off so that only * special case opt-in IRQs can be mangled. */ if (level >= intc_get_dfl_prio_level()) return -EINVAL; __raw_writel(0xa5 << 24 | level << 4, uimask); return count; }

Contributors

PersonTokensPropCommitsCommitProp
Paul Mundt6495.52%150.00%
Kay Sievers34.48%150.00%
Total67100.00%2100.00%

static DEVICE_ATTR(userimask, S_IRUSR | S_IWUSR, show_intc_userimask, store_intc_userimask);
static int __init userimask_sysdev_init(void) { if (unlikely(!uimask)) return -ENXIO; return device_create_file(intc_subsys.dev_root, &dev_attr_userimask); }

Contributors

PersonTokensPropCommitsCommitProp
Paul Mundt2784.38%150.00%
Kay Sievers515.62%150.00%
Total32100.00%2100.00%

late_initcall(userimask_sysdev_init);
int register_intc_userimask(unsigned long addr) { if (unlikely(uimask)) return -EBUSY; uimask = ioremap_nocache(addr, SZ_4K); if (unlikely(!uimask)) return -ENOMEM; pr_info("userimask support registered for levels 0 -> %d\n", intc_get_dfl_prio_level() - 1); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Paul Mundt54100.00%1100.00%
Total54100.00%1100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Paul Mundt23093.50%133.33%
Kay Sievers135.28%133.33%
Nobuhiro Iwamatsu31.22%133.33%
Total246100.00%3100.00%
Directory: drivers/sh/intc
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