OpenSDV
/
original_kernel
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

gpu: host1x: At first try a non-blocking allocation for the gather copy 

The blocking gather copy allocation is a major performance downside of the
Host1x firewall, it may take hundreds milliseconds which is unacceptable
for the real-time graphics operations. Let's try a non-blocking allocation
first as a least invasive solution, it makes opentegra (Xorg driver)
performance indistinguishable with/without the firewall.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Reviewed-by: Erik Faye-Lund <kusmabite@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Dmitry Osipenko 2017-06-15 02:18:43 +03:00 committed by Thierry Reding
parent 8474b02531
commit 43240bbd87
1 changed files with 12 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/gpu/host1x/job.c
View File

@ -574,12 +574,20 @@ static inline int copy_gathers(struct host1x_job *job, struct device *dev)
size += g->words * sizeof(u32);
}
/*
* Try a non-blocking allocation from a higher priority pools first,
* as awaiting for the allocation here is a major performance hit.
*/
job->gather_copy_mapped = dma_alloc_wc(dev, size, &job->gather_copy,
GFP_KERNEL);
if (!job->gather_copy_mapped) {
job->gather_copy_mapped = NULL;
GFP_NOWAIT);
/* the higher priority allocation failed, try the generic-blocking */
if (!job->gather_copy_mapped)
job->gather_copy_mapped = dma_alloc_wc(dev, size,
&job->gather_copy,
GFP_KERNEL);
if (!job->gather_copy_mapped)
return -ENOMEM;
}
job->gather_copy_size = size;