On Wed, Oct 27, 2021 at 05:23:59PM +0100, Matthew Auld wrote:
On Wed, 27 Oct 2021 at 15:54, Lucas De Marchi <lucas.demarchi@xxxxxxxxx> wrote:On Wed, Oct 27, 2021 at 08:57:48AM +0100, Matthew Auld wrote: >On Thu, 21 Oct 2021 at 13:54, Matthew Auld <matthew.auld@xxxxxxxxx> wrote: >> >> wbinvd_on_all_cpus() is only defined on x86 it seems, plus we need to >> include asm/smp.h here. >> >> Reported-by: kernel test robot <lkp@xxxxxxxxx> >> Signed-off-by: Matthew Auld <matthew.auld@xxxxxxxxx> >> Cc: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx> > >Jani, would it make sense to cherry-pick this to -fixes? The offending >commit is in drm-next, and there have been a few reports around this. > >Fixes: a035154da45d ("drm/i915/dmabuf: add paranoid flush-on-acquire") > > >> --- >> drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c | 7 +++++++ >> 1 file changed, 7 insertions(+) >> >> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c >> index 1adcd8e02d29..a45d0ec2c5b6 100644 >> --- a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c >> +++ b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c >> @@ -12,6 +12,13 @@ >> #include "i915_gem_object.h" >> #include "i915_scatterlist.h" >> >> +#if defined(CONFIG_X86) >> +#include <asm/smp.h> >> +#else >> +#define wbinvd_on_all_cpus() \ >> + pr_warn(DRIVER_NAME ": Missing cache flush in %s\n", __func__) not sure I understand why this is a fix. Sure, it's true, but right now this file can't be built on any other arch. For clflush, wbind, etc, I'd rather change the code to use things from drm_cache rather than ifdef it out locally. This is "Reported-by: kernel test robot <lkp@xxxxxxxxx>", but what's the error?I guess it depends on the kernel config, but it reported: error: implicit declaration of function 'wbinvd_on_all_cpus'
oh, ok. The commit message was not very clear. Just checked and this also matches what is done in gem/i915_gem_pm.c (although gt/intel_ggtt.c just includes it unconditionally)
AFAIK it's the missing <asm/smp.h>, the CONFIG_X86 thing is just for good measure. I didn't spot anything in drm_cache which just offers a simple wrapper for wbinvd?
there isn't yet, but it's something we are adding as we add suppport for other archs. thanks Lucas De Marchi
Lucas De Marchi >> +#endif >> + >> I915_SELFTEST_DECLARE(static bool force_different_devices;) >> >> static struct drm_i915_gem_object *dma_buf_to_obj(struct dma_buf *buf) >> -- >> 2.26.3 >>
