mirror of
https://github.com/cirosantilli/linux-kernel-module-cheat.git
synced 2026-01-22 17:55:57 +01:00
56738a1c70
Unsquashed version at v2-rc-unsquashed, but that cannot be merged as it breaks bisects at several points. All bugs will not bisect to this humongous change. It all started with a conversion of the Bash scripts to Python, mainly because I couldn't stand not being able to properly use --options for run which has a million options. Then since that required a full testing, I decided to do all the refactorings that I had in mind at once, and so I did and it became v2-rc. This is the largest patch I have ever done! OMG a few weeks of extra time. I'm never writing a Bash script for anything that starts getting big again. Some of the features are: * separate build-qemu and build-gem5 commands * common: convert scripts to python. Add --option for everything * rename build to build-buildroot now that we are splitting all the build commands, Linux kernel to follow * move all git submodules to submodules/ and all buildroot packages to packages/ * refactor the out/ structure. Keep projects on toplevel, because guest projects separate archs and host ones don't, making a toplevel arch wrong * do-release: rename to just release https://stackoverflow.com/questions/16174992/cant-get-argparse-to-read-quoted-string-with-dashes-in-it * run: add --terminal and explain gem5 pdb * just track the lvimrc * store CLI kernel config fragment inside buildlroot to avoid conflicts * gem5: document m5 initparam * readme: make a bunch of things awesomer * readme: fix broken refs * parsec-benchmark: update to 75d55ac446a43c47efb1044844a108c6c330184c Could not fetch otherwise. * gem5: M5_OVERRIDE_PY_SOURCE
73 lines
1.8 KiB
C
73 lines
1.8 KiB
C
/* https://github.com/cirosantilli/linux-kernel-module-cheat#pmccntr */
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#include <linux/debugfs.h>
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#include <linux/errno.h> /* EFAULT */
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#include <linux/fs.h>
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#include <linux/module.h>
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#include <linux/printk.h> /* pr_info */
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#include <linux/seq_file.h> /* seq_read, seq_lseek, single_release */
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#include <linux/uaccess.h> /* copy_from_user, copy_to_user */
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#include <uapi/linux/stat.h> /* S_IRUSR */
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static struct dentry *debugfs_file;
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static int show(struct seq_file *m, void *v)
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{
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u32 pmccntr;
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#if defined(__arm__)
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/* Invalid aarch64 asm. */
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/* TODO Internal error: Oops - undefined instruction: 0 [#1] ARM */
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/* Enable userland access to conter. */
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/* PMUSERENR = 1 */
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/*__asm__ __volatile__ ("mcr p15, 0, %0, c9, c14, 0" :: "r"(1));*/
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/* TODO oops undefined instruction. */
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/* PMCR.E (bit 0) = 1 */
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/*__asm__ __volatile__ ("mcr p15, 0, %0, c9, c12, 0" :: "r"(1));*/
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/* TODO oops undefined instruction. */
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/* Enable counter. */
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/* PMCNTENSET.C (bit 31) = 1 */
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/*__asm__ __volatile__ ("mcr p15, 0, %0, c9, c12, 1" :: "r"(1 << 31));*/
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/* Get counter value. */
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__asm__ __volatile__ ("mrc p15, 0, %0, c15, c12, 1" : "=r" (pmccntr));
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#else
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pmccntr = 0;
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#endif
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seq_printf(m, "%8.8llX\n", (unsigned long long)pmccntr);
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return 0;
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}
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static int open(struct inode *inode, struct file *file)
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{
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return single_open(file, show, NULL);
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}
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static const struct file_operations fops = {
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.llseek = seq_lseek,
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.open = open,
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.owner = THIS_MODULE,
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.read = seq_read,
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.release = single_release,
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};
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static int myinit(void)
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{
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debugfs_file = debugfs_create_file("lkmc_pmccntr", S_IRUSR, NULL, NULL, &fops);
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if (!debugfs_file) {
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return -1;
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}
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return 0;
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}
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static void myexit(void)
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{
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debugfs_remove(debugfs_file);
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}
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module_init(myinit)
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module_exit(myexit)
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MODULE_LICENSE("GPL");
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