/* Test context switching to see if the DSCR SPR is correctly preserved
 * when within a transaction.
 *
 * Note: We assume that the DSCR has been left at the default value (0)
 * for all CPUs.
 *
 * Method:
 *
 * Set a value into the DSCR.
 *
 * Start a transaction, and suspend it (*).
 *
 * Hard loop checking to see if the transaction has become doomed.
 *
 * Now that we *may* have been preempted, record the DSCR and TEXASR SPRS.
 *
 * If the abort was because of a context switch, check the DSCR value.
 * Otherwise, try again.
 *
 * (*) If the transaction is not suspended we can't see the problem because
 * the transaction abort handler will restore the DSCR to it's checkpointed
 * value before we regain control.
 */

#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <asm/tm.h>

#include "utils.h"
#include "tm.h"

#define SPRN_DSCR       0x03

int test_body(void)
{
	uint64_t rv, dscr1 = 1, dscr2, texasr;

	SKIP_IF(!have_htm());

	printf("Check DSCR TM context switch: ");
	fflush(stdout);
	for (;;) {
		rv = 1;
		asm __volatile__ (
			/* set a known value into the DSCR */
			"ld      3, %[dscr1];"
			"mtspr   %[sprn_dscr], 3;"

			/* start and suspend a transaction */
			"tbegin.;"
			"beq     1f;"
			"tsuspend.;"

			/* hard loop until the transaction becomes doomed */
			"2: ;"
			"tcheck 0;"
			"bc      4, 0, 2b;"

			/* record DSCR and TEXASR */
			"mfspr   3, %[sprn_dscr];"
			"std     3, %[dscr2];"
			"mfspr   3, %[sprn_texasr];"
			"std     3, %[texasr];"

			"tresume.;"
			"tend.;"
			"li      %[rv], 0;"
			"1: ;"
			: [rv]"=r"(rv), [dscr2]"=m"(dscr2), [texasr]"=m"(texasr)
			: [dscr1]"m"(dscr1)
			, [sprn_dscr]"i"(SPRN_DSCR), [sprn_texasr]"i"(SPRN_TEXASR)
			: "memory", "r3"
		);
		assert(rv); /* make sure the transaction aborted */
		if ((texasr >> 56) != TM_CAUSE_RESCHED) {
			putchar('.');
			fflush(stdout);
			continue;
		}
		if (dscr2 != dscr1) {
			printf(" FAIL\n");
			return 1;
		} else {
			printf(" OK\n");
			return 0;
		}
	}
}

int main(void)
{
	return test_harness(test_body, "tm_resched_dscr");
}
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net'>net</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/core'>core</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/core/gen_estimator.c'>gen_estimator.c</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><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>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2016-12-12 21:58:13 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2016-12-12 21:58:13 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/core/gen_estimator.c?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'>e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/core/gen_estimator.c?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/'>f63906f41699c8e38af9d12b063e2ceab0286ef2</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/core/gen_estimator.c'>net/core/gen_estimator.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/core/gen_estimator.c?id=e34bac726d27056081d0250c0e173e4b155aa340'>e34bac726d27056081d0250c0e173e4b155aa340</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/core/gen_estimator.c?id2=e34bac726d27056081d0250c0e173e4b155aa340'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/core/gen_estimator.c?id=868c97a846a73e937d835b09b8c885a69df50ec8'>868c97a846a73e937d835b09b8c885a69df50ec8</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/core/gen_estimator.c?id2=868c97a846a73e937d835b09b8c885a69df50ec8'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge tag 'docs-4.10' of git://git.lwn.net/linux<span class='decoration'><a class='deco' href='/cgit.cgi/linux/net-next.git/commit/net/core/gen_estimator.c?id=e7aa8c2eb11ba69b1b69099c3c7bd6be3087b0ba'>HEAD</a><a class='branch-deco' href='/cgit.cgi/linux/net-next.git/log/net/core/gen_estimator.c'>master</a></span></div><div class='commit-msg'>Pull documentation update from Jonathan Corbet:
 "These are the documentation changes for 4.10.

  It's another busy cycle for the docs tree, as the sphinx conversion
  continues. Highlights include:

   - Further work on PDF output, which remains a bit of a pain but
     should be more solid now.

   - Five more DocBook template files converted to Sphinx. Only 27 to
     go... Lots of plain-text files have also been converted and
     integrated.

   - Images in binary formats have been replaced with more
     source-friendly versions.

   - Various bits of organizational work, including the renaming of
     various files discussed at the kernel summit.

   - New documentation for the device_link mechanism.

  ... and, of course, lots of typo fixes and small updates"

* tag 'docs-4.10' of git://git.lwn.net/linux: (193 commits)
  dma-buf: Extract dma-buf.rst
  Update Documentation/00-INDEX
  docs: 00-INDEX: document directories/files with no docs
  docs: 00-INDEX: remove non-existing entries
  docs: 00-INDEX: add missing entries for documentation files/dirs
  docs: 00-INDEX: consolidate process/ and admin-guide/ description
  scripts: add a script to check if Documentation/00-INDEX is sane
  Docs: change sh -&gt; awk in REPORTING-BUGS
  Documentation/core-api/device_link: Add initial documentation
  core-api: remove an unexpected unident
  ppc/idle: Add documentation for powersave=off
  Doc: Correct typo, "Introdution" =&gt; "Introduction"
  Documentation/atomic_ops.txt: convert to ReST markup
  Documentation/local_ops.txt: convert to ReST markup
  Documentation/assoc_array.txt: convert to ReST markup
  docs-rst: parse-headers.pl: cleanup the documentation
  docs-rst: fix media cleandocs target
  docs-rst: media/Makefile: reorganize the rules
  docs-rst: media: build SVG from graphviz files
  docs-rst: replace bayer.png by a SVG image
  ...
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/'>Diffstat</a> (limited to 'net/core/gen_estimator.c')</div><table summary='diffstat' class='diffstat'>