Re: [PATCH 5/6] drm/vc4: Fix overflow mem unreferencing when the binner runs dry.
From: Rob Clark <hidden>
Date: 2016-07-26 21:10:17
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dri-devel, lkml
On Tue, Jul 26, 2016 at 4:47 PM, Eric Anholt [off-list ref] wrote:
Overflow memory handling is tricky: While it's still referenced by the BPO registers, we want to keep it from being freed. When we are putting a new set of overflow memory in the registers, we need to assign the old one to the last rendering job using it. We were looking at "what's currently running in the binner", but since the bin/render submission split, we may end up with the binner completing and having no new job while the renderer is still processing. So, if we don't find a bin job at all, look at the highest-seqno (last) render job to attach our overflow to.
so, drive-by comment.. but can you allocate gem bo's without backing them immediately with pages? If so, just always allocate the bo up-front and attach it as a dependency of the batch, and only pin it to actual pages when you have to overflow? BR, -R
quoted hunk ↗ jump to hunk
Signed-off-by: Eric Anholt <redacted> Fixes: ca26d28bbaa3 ("drm/vc4: improve throughput by pipelining binning and rendering jobs") Cc: stable@vger.kernel.org --- drivers/gpu/drm/vc4/vc4_drv.h | 9 +++++++++ drivers/gpu/drm/vc4/vc4_irq.c | 4 +++- 2 files changed, 12 insertions(+), 1 deletion(-)diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h index 0ced289d7696..87f727932af2 100644 --- a/drivers/gpu/drm/vc4/vc4_drv.h +++ b/drivers/gpu/drm/vc4/vc4_drv.h@@ -321,6 +321,15 @@ vc4_first_render_job(struct vc4_dev *vc4) struct vc4_exec_info, head); } +static inline struct vc4_exec_info * +vc4_last_render_job(struct vc4_dev *vc4) +{ + if (list_empty(&vc4->render_job_list)) + return NULL; + return list_last_entry(&vc4->render_job_list, + struct vc4_exec_info, head); +} + /** * struct vc4_texture_sample_info - saves the offsets into the UBO for texture * setup parameters.diff --git a/drivers/gpu/drm/vc4/vc4_irq.c b/drivers/gpu/drm/vc4/vc4_irq.c index b0104a346a74..094bc6a475c1 100644 --- a/drivers/gpu/drm/vc4/vc4_irq.c +++ b/drivers/gpu/drm/vc4/vc4_irq.c@@ -83,8 +83,10 @@ vc4_overflow_mem_work(struct work_struct *work) spin_lock_irqsave(&vc4->job_lock, irqflags); current_exec = vc4_first_bin_job(vc4); + if (!current_exec) + current_exec = vc4_last_render_job(vc4); if (current_exec) { - vc4->overflow_mem->seqno = vc4->finished_seqno + 1; + vc4->overflow_mem->seqno = current_exec->seqno; list_add_tail(&vc4->overflow_mem->unref_head, ¤t_exec->unref_list); vc4->overflow_mem = NULL; --2.8.1 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel