/*
 * Ptrace test TM SPR registers
 *
 * Copyright (C) 2015 Anshuman Khandual, IBM Corporation.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */
#include "ptrace.h"
#include "tm.h"

/* Tracee and tracer shared data */
struct shared {
	int flag;
	struct tm_spr_regs regs;
};
unsigned long tfhar;

int shm_id;
struct shared *cptr, *pptr;

int shm_id1;
int *cptr1, *pptr1;

#define TM_KVM_SCHED   0xe0000001ac000001
int validate_tm_spr(struct tm_spr_regs *regs)
{
	FAIL_IF(regs->tm_tfhar != tfhar);
	FAIL_IF((regs->tm_texasr == TM_KVM_SCHED) && (regs->tm_tfiar != 0));

	return TEST_PASS;
}

void tm_spr(void)
{
	unsigned long result, texasr;
	int ret;

	cptr = (struct shared *)shmat(shm_id, NULL, 0);
	cptr1 = (int *)shmat(shm_id1, NULL, 0);

trans:
	cptr1[0] = 0;
	asm __volatile__(
		"1: ;"
		/* TM failover handler should follow "tbegin.;" */
		"mflr 31;"
		"bl 4f;"	/* $ = TFHAR - 12 */
		"4: ;"
		"mflr %[tfhar];"
		"mtlr 31;"

		"tbegin.;"
		"beq 2f;"

		"tsuspend.;"
		"li 8, 1;"
		"sth 8, 0(%[cptr1]);"
		"tresume.;"
		"b .;"

		"tend.;"
		"li 0, 0;"
		"ori %[res], 0, 0;"
		"b 3f;"

		"2: ;"

		"li 0, 1;"
		"ori %[res], 0, 0;"
		"mfspr %[texasr], %[sprn_texasr];"

		"3: ;"
		: [tfhar] "=r" (tfhar), [res] "=r" (result),
		[texasr] "=r" (texasr), [cptr1] "=r" (cptr1)
		: [sprn_texasr] "i"  (SPRN_TEXASR)
		: "memory", "r0", "r1", "r2", "r3", "r4",
		"r8", "r9", "r10", "r11", "r31"
		);

	/* There are 2 32bit instructions before tbegin. */
	tfhar += 12;

	if (result) {
		if (!cptr->flag)
			goto trans;

		ret = validate_tm_spr((struct tm_spr_regs *)&cptr->regs);
		shmdt((void *)cptr);
		shmdt((void *)cptr1);
		if (ret)
			exit(1);
		exit(0);
	}
	shmdt((void *)cptr);
	shmdt((void *)cptr1);
	exit(1);
}

int trace_tm_spr(pid_t child)
{
	FAIL_IF(start_trace(child));
	FAIL_IF(show_tm_spr(child, (struct tm_spr_regs *)&pptr->regs));

	printf("TFHAR: %lx TEXASR: %lx TFIAR: %lx\n", pptr->regs.tm_tfhar,
				pptr->regs.tm_texasr, pptr->regs.tm_tfiar);

	pptr->flag = 1;
	FAIL_IF(stop_trace(child));

	return TEST_PASS;
}

int ptrace_tm_spr(void)
{
	pid_t pid;
	int ret, status;

	SKIP_IF(!have_htm());
	shm_id = shmget(IPC_PRIVATE, sizeof(struct shared), 0777|IPC_CREAT);
	shm_id1 = shmget(IPC_PRIVATE, sizeof(int), 0777|IPC_CREAT);
	pid = fork();
	if (pid < 0) {
		perror("fork() failed");
		return TEST_FAIL;
	}

	if (pid == 0)
		tm_spr();

	if (pid) {
		pptr = (struct shared *)shmat(shm_id, NULL, 0);
		pptr1 = (int *)shmat(shm_id1, NULL, 0);

		while (!pptr1[0])
			asm volatile("" : : : "memory");
		ret = trace_tm_spr(pid);
		if (ret) {
			kill(pid, SIGKILL);
			shmdt((void *)pptr);
			shmdt((void *)pptr1);
			shmctl(shm_id, IPC_RMID, NULL);
			shmctl(shm_id1, IPC_RMID, NULL);
			return TEST_FAIL;
		}

		shmdt((void *)pptr);
		shmdt((void *)pptr1);
		ret = wait(&status);
		shmctl(shm_id, IPC_RMID, NULL);
		shmctl(shm_id1, IPC_RMID, NULL);
		if (ret != pid) {
			printf("Child's exit status not captured\n");
			return TEST_FAIL;
		}

		return (WIFEXITED(status) && WEXITSTATUS(status)) ? TEST_FAIL :
			TEST_PASS;
	}
	return TEST_PASS;
}

int main(int argc, char *argv[])
{
	return test_harness(ptrace_tm_spr, "ptrace_tm_spr");
}
x/net-next.git/log/sound/usb/misc/ua101.c?h=nds-private-remove&amp;id=78098117f8bfad4f2104c3f7b6b69071af95a246'>ua101.c</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/sound/usb/misc/ua101.c?h=nds-private-remove&amp;id=78098117f8bfad4f2104c3f7b6b69071af95a246&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
te-remove'/><input type='hidden' name='id' value='030305d69fc6963c16003f50d7e8d74b02d0a143'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Bjorn Helgaas &lt;bhelgaas@google.com&gt;</td><td class='right'>2017-01-27 15:00:45 -0600</td></tr>
<tr><th>committer</th><td>Bjorn Helgaas &lt;bhelgaas@google.com&gt;</td><td class='right'>2017-01-27 15:00:45 -0600</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/Documentation/perf-sched.txt?h=nds-private-remove&amp;id=030305d69fc6963c16003f50d7e8d74b02d0a143'>030305d69fc6963c16003f50d7e8d74b02d0a143</a> (<a href='/cgit.cgi/linux/net-next.git/patch/tools/perf/Documentation/perf-sched.txt?id=030305d69fc6963c16003f50d7e8d74b02d0a143'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=030305d69fc6963c16003f50d7e8d74b02d0a143'>363a4e34d199178769b7e7eeb26ea2620a55847b</a> /<a href='/cgit.cgi/linux/net-next.git/tree/tools/perf/Documentation/perf-sched.txt?h=nds-private-remove&amp;id=030305d69fc6963c16003f50d7e8d74b02d0a143'>tools/perf/Documentation/perf-sched.txt</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/Documentation/perf-sched.txt?h=nds-private-remove&amp;id=4d191b1b63c209e37bf27938ef365244d3c41084'>4d191b1b63c209e37bf27938ef365244d3c41084</a> (<a href='/cgit.cgi/linux/net-next.git/diff/tools/perf/Documentation/perf-sched.txt?h=nds-private-remove&amp;id=030305d69fc6963c16003f50d7e8d74b02d0a143&amp;id2=4d191b1b63c209e37bf27938ef365244d3c41084'>diff</a>)</td></tr></table>
<div class='commit-subject'>PCI/ASPM: Handle PCI-to-PCIe bridges as roots of PCIe hierarchies</div><div class='commit-msg'>In a struct pcie_link_state, link-&gt;root points to the pcie_link_state of
the root of the PCIe hierarchy.  For the topmost link, this points to
itself (link-&gt;root = link).  For others, we copy the pointer from the
parent (link-&gt;root = link-&gt;parent-&gt;root).

Previously we recognized that Root Ports originated PCIe hierarchies, but
we treated PCI/PCI-X to PCIe Bridges as being in the middle of the
hierarchy, and when we tried to copy the pointer from link-&gt;parent-&gt;root,
there was no parent, and we dereferenced a NULL pointer:

  BUG: unable to handle kernel NULL pointer dereference at 0000000000000090
  IP: [&lt;ffffffff9e424350&gt;] pcie_aspm_init_link_state+0x170/0x820

Recognize that PCI/PCI-X to PCIe Bridges originate PCIe hierarchies just
like Root Ports do, so link-&gt;root for these devices should also point to
itself.

Fixes: 51ebfc92b72b ("PCI: Enumerate switches below PCI-to-PCIe bridges")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=193411
Link: https://bugzilla.opensuse.org/show_bug.cgi?id=1022181
Tested-by: lists@ssl-mail.com
Tested-by: Jayachandran C. &lt;jnair@caviumnetworks.com&gt;
Signed-off-by: Bjorn Helgaas &lt;bhelgaas@google.com&gt;
CC: stable@vger.kernel.org	# v4.2+</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=030305d69fc6963c16003f50d7e8d74b02d0a143'>Diffstat</a> (limited to 'tools/perf/Documentation/perf-sched.txt')</div><table summary='diffstat' class='diffstat'>