1e016a8693
A danger encountered when resetting the seqno (using debugfs/i915_next_seqno) is that as we change the breadcrumb stored in the HWSP, it may be inspected by the signaler thread leading to confusion in our sanity checks. <0> [136.331342] i915/sig-347 3..s1 136336154us : execlists_submission_tasklet: rcs0 awake?=1, active=5 <0> [136.331373] i915/sig-347 3d.s2 136336155us : process_csb: rcs0 cs-irq head=5, tail=0 <0> [136.331402] i915/sig-347 3d.s2 136336155us : process_csb: rcs0 csb[0]: status=0x00000018:0x00000002, active=0x5 <0> [136.331434] i915/sig-347 3d.s2 136336156us : process_csb: rcs0 out[0]: ctx=2.1, global=219 (fence 46:8455) (current 219), prio=0 <0> [136.331466] i915/sig-347 3d.s2 136336156us : process_csb: rcs0 completed ctx=2 <0> [136.332027] gem_exec-1049 0.... 136336246us : reset_all_global_seqno.part.5: rcs0 seqno 219 (current 219) -> -43 <0> [136.332056] gem_exec-1049 0.... 136336251us : reset_all_global_seqno.part.5: bcs0 seqno 183 (current 183) -> -43 <0> [136.332085] gem_exec-1049 0.... 136336255us : reset_all_global_seqno.part.5: vcs0 seqno 191 (current 191) -> -43 <0> [136.332114] gem_exec-1049 0.... 136336259us : reset_all_global_seqno.part.5: vcs1 seqno 180 (current 180) -> -43 <0> [136.332143] gem_exec-1049 0.... 136336262us : reset_all_global_seqno.part.5: vecs0 seqno 212 (current 212) -> -43 <0> [136.332174] i915/sig-347 3.... 136336280us : intel_breadcrumbs_signaler: intel_breadcrumbs_signaler:673 GEM_BUG_ON(!i915_request_completed(rq)) Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20181024104939.2861-1-chris@chris-wilson.co.uk
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.