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video: tegra: nvmap: Add support for sgt caching

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Deferred dmabuf unmapping is being removed from kernel.
So, add similar support to cache sgt in NvMap.
During map_dma_buf() call, NvMap will create a mapping and an sgt
corresponding to it. It will also cache this sgt.
When unmap_dma_buf() is called for same sgt, NvMap will not unmap
the mappings. It will simply return from there.
Next time when the mapping request comes for same dmabuf, it will
look for existing sgt in cache and return it. This significantly
reduces mapping overhead for same buffer when it's mapped and unmapped
multiple times.
Free the sgt and unmap only when corresponding buffer is freed. When
all references from a buffer are removed, dmabuf_release() will be
called where sgt will be freed.

Bug 4064339

Change-Id: I7ed767ecaaac7aa44e6576e701b28537b84986ec
Signed-off-by: Ashish Mhetre <amhetre@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/2925224
Reviewed-by: svcacv <svcacv@nvidia.com>
Reviewed-by: Sachin Nikam <snikam@nvidia.com>
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>
This commit is contained in:
Ashish Mhetre
2023-06-23 17:34:21 +05:30
committed by mobile promotions
parent ad2857ccaa
commit 9207ceb10a
3 changed files with 117 additions and 13 deletions
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5
drivers/video/tegra/nvmap/nvmap_dev.c
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@@ -1464,6 +1464,10 @@ int __init nvmap_probe(struct platform_device *pdev)
nvmap_stats_init(nvmap_debug_root);
platform_set_drvdata(pdev, dev);
e = nvmap_dmabuf_stash_init();
if (e)
goto fail_heaps;
for (i = 0; i < dev->nr_carveouts; i++)
if (dev->heaps[i].heap_bit & NVMAP_HEAP_CARVEOUT_GENERIC)
generic_carveout_present = 1;
@@ -1526,6 +1530,7 @@ int nvmap_remove(struct platform_device *pdev)
#ifdef NVMAP_CONFIG_SCIIPC
nvmap_sci_ipc_exit();
#endif
nvmap_dmabuf_stash_deinit();
debugfs_remove_recursive(dev->debug_root);
misc_deregister(&dev->dev_user);
#ifdef NVMAP_CONFIG_PAGE_POOLS