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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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5a0e3ad6af
percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
181 lines
4.2 KiB
C
181 lines
4.2 KiB
C
/*
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* Generic heartbeat driver for regular LED banks
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*
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* Copyright (C) 2007 - 2010 Paul Mundt
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*
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* Most SH reference boards include a number of individual LEDs that can
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* be independently controlled (either via a pre-defined hardware
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* function or via the LED class, if desired -- the hardware tends to
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* encapsulate some of the same "triggers" that the LED class supports,
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* so there's not too much value in it).
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*
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* Additionally, most of these boards also have a LED bank that we've
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* traditionally used for strobing the load average. This use case is
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* handled by this driver, rather than giving each LED bit position its
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* own struct device.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/sched.h>
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#include <linux/timer.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <asm/heartbeat.h>
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#define DRV_NAME "heartbeat"
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#define DRV_VERSION "0.1.2"
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static unsigned char default_bit_pos[] = { 0, 1, 2, 3, 4, 5, 6, 7 };
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static inline void heartbeat_toggle_bit(struct heartbeat_data *hd,
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unsigned bit, unsigned int inverted)
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{
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unsigned int new;
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new = (1 << hd->bit_pos[bit]);
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if (inverted)
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new = ~new;
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new &= hd->mask;
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switch (hd->regsize) {
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case 32:
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new |= ioread32(hd->base) & ~hd->mask;
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iowrite32(new, hd->base);
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break;
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case 16:
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new |= ioread16(hd->base) & ~hd->mask;
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iowrite16(new, hd->base);
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break;
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default:
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new |= ioread8(hd->base) & ~hd->mask;
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iowrite8(new, hd->base);
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break;
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}
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}
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static void heartbeat_timer(unsigned long data)
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{
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struct heartbeat_data *hd = (struct heartbeat_data *)data;
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static unsigned bit = 0, up = 1;
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heartbeat_toggle_bit(hd, bit, hd->flags & HEARTBEAT_INVERTED);
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bit += up;
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if ((bit == 0) || (bit == (hd->nr_bits)-1))
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up = -up;
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mod_timer(&hd->timer, jiffies + (110 - ((300 << FSHIFT) /
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((avenrun[0] / 5) + (3 << FSHIFT)))));
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}
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static int heartbeat_drv_probe(struct platform_device *pdev)
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{
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struct resource *res;
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struct heartbeat_data *hd;
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int i;
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if (unlikely(pdev->num_resources != 1)) {
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dev_err(&pdev->dev, "invalid number of resources\n");
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return -EINVAL;
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}
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (unlikely(res == NULL)) {
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dev_err(&pdev->dev, "invalid resource\n");
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return -EINVAL;
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}
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if (pdev->dev.platform_data) {
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hd = pdev->dev.platform_data;
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} else {
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hd = kzalloc(sizeof(struct heartbeat_data), GFP_KERNEL);
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if (unlikely(!hd))
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return -ENOMEM;
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}
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hd->base = ioremap_nocache(res->start, resource_size(res));
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if (unlikely(!hd->base)) {
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dev_err(&pdev->dev, "ioremap failed\n");
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if (!pdev->dev.platform_data)
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kfree(hd);
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return -ENXIO;
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}
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if (!hd->nr_bits) {
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hd->bit_pos = default_bit_pos;
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hd->nr_bits = ARRAY_SIZE(default_bit_pos);
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}
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hd->mask = 0;
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for (i = 0; i < hd->nr_bits; i++)
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hd->mask |= (1 << hd->bit_pos[i]);
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if (!hd->regsize) {
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switch (res->flags & IORESOURCE_MEM_TYPE_MASK) {
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case IORESOURCE_MEM_32BIT:
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hd->regsize = 32;
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break;
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case IORESOURCE_MEM_16BIT:
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hd->regsize = 16;
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break;
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case IORESOURCE_MEM_8BIT:
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default:
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hd->regsize = 8;
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break;
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}
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}
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setup_timer(&hd->timer, heartbeat_timer, (unsigned long)hd);
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platform_set_drvdata(pdev, hd);
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return mod_timer(&hd->timer, jiffies + 1);
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}
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static int heartbeat_drv_remove(struct platform_device *pdev)
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{
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struct heartbeat_data *hd = platform_get_drvdata(pdev);
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del_timer_sync(&hd->timer);
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iounmap(hd->base);
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platform_set_drvdata(pdev, NULL);
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if (!pdev->dev.platform_data)
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kfree(hd);
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return 0;
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}
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static struct platform_driver heartbeat_driver = {
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.probe = heartbeat_drv_probe,
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.remove = heartbeat_drv_remove,
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.driver = {
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.name = DRV_NAME,
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},
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};
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static int __init heartbeat_init(void)
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{
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printk(KERN_NOTICE DRV_NAME ": version %s loaded\n", DRV_VERSION);
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return platform_driver_register(&heartbeat_driver);
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}
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static void __exit heartbeat_exit(void)
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{
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platform_driver_unregister(&heartbeat_driver);
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}
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module_init(heartbeat_init);
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module_exit(heartbeat_exit);
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MODULE_VERSION(DRV_VERSION);
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MODULE_AUTHOR("Paul Mundt");
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MODULE_LICENSE("GPL v2");
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