On Thu, Nov 06, 2014 at 02:39:53PM -0800, Volkin, Bradley D wrote:
> Ping on this series. They're related to the batch copy series, but
> the changes are valid and tests should still pass even without the
> kernel changes being merged.
Merged - I kinda forgotten that you don't have commit access.
>
> On Mon, Nov 03, 2014 at 11:18:59AM -0800, Volkin, Bradley D wrote:
> > From: Brad Volkin <bradley.d.volkin@xxxxxxxxx>
> >
> > The size of the batch buffer passed to the kernel is significantly
> > larger than the size of the batch buffer passed to the function. A
> > proposed optimization as part of the batch copy kernel series is to
> > use batch_len for the copy and parse operations, which leads to a
> > false "batch without MI_BATCH_BUFFER_END" failure for this test.
> >
> > To fix this, modify the test to set batch_start_offset and batch_len
> > such that they define the range of actual commands in the batch,
> > including a few of the surrounding nops for alignment purposes.
> >
> > v2: update batch_start_offset as well
> >
> > Signed-off-by: Brad Volkin <bradley.d.volkin@xxxxxxxxx>
> > ---
> > tests/gem_exec_parse.c | 16 ++++++++++++----
> > 1 file changed, 12 insertions(+), 4 deletions(-)
> >
> > diff --git a/tests/gem_exec_parse.c b/tests/gem_exec_parse.c
> > index 1dc9103..e48b83a 100644
> > --- a/tests/gem_exec_parse.c
> > +++ b/tests/gem_exec_parse.c
> > @@ -144,16 +144,18 @@ static void exec_split_batch(int fd, uint32_t *cmds,
> > struct drm_i915_gem_exec_object2 objs[1];
> > uint32_t cmd_bo;
> > uint32_t noop[1024] = { 0 };
> > + const int alloc_size = 4096 * 2;
> > + const int actual_start_offset = 4096-sizeof(uint32_t);
> >
> > // Allocate and fill a 2-page batch with noops
> > - cmd_bo = gem_create(fd, 4096 * 2);
> > + cmd_bo = gem_create(fd, alloc_size);
> > gem_write(fd, cmd_bo, 0, noop, sizeof(noop));
> > gem_write(fd, cmd_bo, 4096, noop, sizeof(noop));
> >
> > // Write the provided commands such that the first dword
> > // of the command buffer is the last dword of the first
> > // page (i.e. the command is split across the two pages).
> > - gem_write(fd, cmd_bo, 4096-sizeof(uint32_t), cmds, size);
> > + gem_write(fd, cmd_bo, actual_start_offset, cmds, size);
> >
> > objs[0].handle = cmd_bo;
> > objs[0].relocation_count = 0;
> > @@ -166,8 +168,14 @@ static void exec_split_batch(int fd, uint32_t *cmds,
> >
> > execbuf.buffers_ptr = (uintptr_t)objs;
> > execbuf.buffer_count = 1;
> > - execbuf.batch_start_offset = 0;
> > - execbuf.batch_len = size;
> > + // NB: We want batch_start_offset and batch_len to point to the block
> > + // of the actual commands (i.e. at the last dword of the first page),
> > + // but have to adjust both the start offset and length to meet the
> > + // kernel driver's requirements on the alignment of those fields.
Also pushed a patch on top to change all the comments to C-style, just for
my OCD ;-)
-Daniel
> > + execbuf.batch_start_offset = actual_start_offset & ~0x7;
> > + execbuf.batch_len =
> > + ALIGN(size + actual_start_offset - execbuf.batch_start_offset,
> > + 0x8);
> > execbuf.cliprects_ptr = 0;
> > execbuf.num_cliprects = 0;
> > execbuf.DR1 = 0;
> > --
> > 1.9.1
> >
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--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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