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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>
281 lines
6.4 KiB
C
281 lines
6.4 KiB
C
/*
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* Virtual Processor Dispatch Trace Log
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*
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* (C) Copyright IBM Corporation 2009
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*
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* Author: Jeremy Kerr <jk@ozlabs.org>
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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 as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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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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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/debugfs.h>
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#include <asm/smp.h>
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#include <asm/system.h>
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#include <asm/uaccess.h>
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#include <asm/firmware.h>
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#include "plpar_wrappers.h"
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/*
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* Layout of entries in the hypervisor's DTL buffer. Although we don't
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* actually access the internals of an entry (we only need to know the size),
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* we might as well define it here for reference.
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*/
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struct dtl_entry {
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u8 dispatch_reason;
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u8 preempt_reason;
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u16 processor_id;
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u32 enqueue_to_dispatch_time;
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u32 ready_to_enqueue_time;
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u32 waiting_to_ready_time;
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u64 timebase;
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u64 fault_addr;
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u64 srr0;
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u64 srr1;
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};
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struct dtl {
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struct dtl_entry *buf;
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struct dentry *file;
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int cpu;
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int buf_entries;
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u64 last_idx;
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};
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static DEFINE_PER_CPU(struct dtl, cpu_dtl);
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/*
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* Dispatch trace log event mask:
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* 0x7: 0x1: voluntary virtual processor waits
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* 0x2: time-slice preempts
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* 0x4: virtual partition memory page faults
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*/
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static u8 dtl_event_mask = 0x7;
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/*
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* Size of per-cpu log buffers. Default is just under 16 pages worth.
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*/
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static int dtl_buf_entries = (16 * 85);
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static int dtl_enable(struct dtl *dtl)
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{
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unsigned long addr;
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int ret, hwcpu;
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/* only allow one reader */
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if (dtl->buf)
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return -EBUSY;
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/* we need to store the original allocation size for use during read */
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dtl->buf_entries = dtl_buf_entries;
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dtl->buf = kmalloc_node(dtl->buf_entries * sizeof(struct dtl_entry),
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GFP_KERNEL, cpu_to_node(dtl->cpu));
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if (!dtl->buf) {
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printk(KERN_WARNING "%s: buffer alloc failed for cpu %d\n",
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__func__, dtl->cpu);
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return -ENOMEM;
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}
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/* Register our dtl buffer with the hypervisor. The HV expects the
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* buffer size to be passed in the second word of the buffer */
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((u32 *)dtl->buf)[1] = dtl->buf_entries * sizeof(struct dtl_entry);
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hwcpu = get_hard_smp_processor_id(dtl->cpu);
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addr = __pa(dtl->buf);
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ret = register_dtl(hwcpu, addr);
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if (ret) {
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printk(KERN_WARNING "%s: DTL registration for cpu %d (hw %d) "
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"failed with %d\n", __func__, dtl->cpu, hwcpu, ret);
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kfree(dtl->buf);
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return -EIO;
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}
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/* set our initial buffer indices */
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dtl->last_idx = lppaca[dtl->cpu].dtl_idx = 0;
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/* ensure that our updates to the lppaca fields have occurred before
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* we actually enable the logging */
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smp_wmb();
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/* enable event logging */
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lppaca[dtl->cpu].dtl_enable_mask = dtl_event_mask;
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return 0;
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}
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static void dtl_disable(struct dtl *dtl)
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{
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int hwcpu = get_hard_smp_processor_id(dtl->cpu);
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lppaca[dtl->cpu].dtl_enable_mask = 0x0;
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unregister_dtl(hwcpu, __pa(dtl->buf));
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kfree(dtl->buf);
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dtl->buf = NULL;
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dtl->buf_entries = 0;
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}
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/* file interface */
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static int dtl_file_open(struct inode *inode, struct file *filp)
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{
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struct dtl *dtl = inode->i_private;
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int rc;
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rc = dtl_enable(dtl);
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if (rc)
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return rc;
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filp->private_data = dtl;
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return 0;
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}
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static int dtl_file_release(struct inode *inode, struct file *filp)
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{
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struct dtl *dtl = inode->i_private;
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dtl_disable(dtl);
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return 0;
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}
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static ssize_t dtl_file_read(struct file *filp, char __user *buf, size_t len,
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loff_t *pos)
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{
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int rc, cur_idx, last_idx, n_read, n_req, read_size;
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struct dtl *dtl;
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if ((len % sizeof(struct dtl_entry)) != 0)
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return -EINVAL;
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dtl = filp->private_data;
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/* requested number of entries to read */
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n_req = len / sizeof(struct dtl_entry);
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/* actual number of entries read */
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n_read = 0;
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cur_idx = lppaca[dtl->cpu].dtl_idx;
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last_idx = dtl->last_idx;
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if (cur_idx - last_idx > dtl->buf_entries) {
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pr_debug("%s: hv buffer overflow for cpu %d, samples lost\n",
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__func__, dtl->cpu);
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}
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cur_idx %= dtl->buf_entries;
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last_idx %= dtl->buf_entries;
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/* read the tail of the buffer if we've wrapped */
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if (last_idx > cur_idx) {
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read_size = min(n_req, dtl->buf_entries - last_idx);
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rc = copy_to_user(buf, &dtl->buf[last_idx],
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read_size * sizeof(struct dtl_entry));
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if (rc)
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return -EFAULT;
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last_idx = 0;
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n_req -= read_size;
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n_read += read_size;
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buf += read_size * sizeof(struct dtl_entry);
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}
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/* .. and now the head */
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read_size = min(n_req, cur_idx - last_idx);
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rc = copy_to_user(buf, &dtl->buf[last_idx],
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read_size * sizeof(struct dtl_entry));
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if (rc)
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return -EFAULT;
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n_read += read_size;
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dtl->last_idx += n_read;
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return n_read * sizeof(struct dtl_entry);
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}
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static const struct file_operations dtl_fops = {
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.open = dtl_file_open,
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.release = dtl_file_release,
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.read = dtl_file_read,
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.llseek = no_llseek,
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};
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static struct dentry *dtl_dir;
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static int dtl_setup_file(struct dtl *dtl)
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{
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char name[10];
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sprintf(name, "cpu-%d", dtl->cpu);
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dtl->file = debugfs_create_file(name, 0400, dtl_dir, dtl, &dtl_fops);
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if (!dtl->file)
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return -ENOMEM;
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return 0;
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}
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static int dtl_init(void)
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{
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struct dentry *event_mask_file, *buf_entries_file;
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int rc, i;
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if (!firmware_has_feature(FW_FEATURE_SPLPAR))
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return -ENODEV;
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/* set up common debugfs structure */
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rc = -ENOMEM;
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dtl_dir = debugfs_create_dir("dtl", powerpc_debugfs_root);
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if (!dtl_dir) {
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printk(KERN_WARNING "%s: can't create dtl root dir\n",
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__func__);
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goto err;
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}
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event_mask_file = debugfs_create_x8("dtl_event_mask", 0600,
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dtl_dir, &dtl_event_mask);
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buf_entries_file = debugfs_create_u32("dtl_buf_entries", 0600,
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dtl_dir, &dtl_buf_entries);
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if (!event_mask_file || !buf_entries_file) {
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printk(KERN_WARNING "%s: can't create dtl files\n", __func__);
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goto err_remove_dir;
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}
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/* set up the per-cpu log structures */
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for_each_possible_cpu(i) {
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struct dtl *dtl = &per_cpu(cpu_dtl, i);
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dtl->cpu = i;
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rc = dtl_setup_file(dtl);
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if (rc)
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goto err_remove_dir;
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}
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return 0;
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err_remove_dir:
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debugfs_remove_recursive(dtl_dir);
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err:
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return rc;
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}
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arch_initcall(dtl_init);
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