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drm/etnaviv: iommuv1: remove map_lock

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It wasn't protecting anything, as the single word writes used to
set up or tear down a translation are already inherently atomic,
so the spinlock is pure overhead.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-By: Wladimir J. van der Laan <laanwj@gmail.com>
This commit is contained in:
Lucas Stach 2017-09-07 15:41:38 +02:00
parent bd2442bc1b
commit 86666c54c8
1 changed files with 0 additions and 7 deletions
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7
drivers/gpu/drm/etnaviv/etnaviv_iommu.c
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@ -42,7 +42,6 @@ struct etnaviv_iommu_domain {
void *bad_page_cpu;
dma_addr_t bad_page_dma;
struct etnaviv_iommu_domain_pgtable pgtable;
spinlock_t map_lock;
};
static struct etnaviv_iommu_domain *to_etnaviv_domain(struct iommu_domain *domain)
@ -81,8 +80,6 @@ static int __etnaviv_iommu_init(struct etnaviv_iommu_domain *etnaviv_domain)
etnaviv_domain->pgtable.pgtable[i] =
etnaviv_domain->bad_page_dma;
spin_lock_init(&etnaviv_domain->map_lock);
return 0;
}
@ -110,9 +107,7 @@ static int etnaviv_iommuv1_map(struct iommu_domain *domain, unsigned long iova,
if (size != SZ_4K)
return -EINVAL;
spin_lock(&etnaviv_domain->map_lock);
etnaviv_domain->pgtable.pgtable[index] = paddr;
spin_unlock(&etnaviv_domain->map_lock);
return 0;
}
@ -126,9 +121,7 @@ static size_t etnaviv_iommuv1_unmap(struct iommu_domain *domain,
if (size != SZ_4K)
return -EINVAL;
spin_lock(&etnaviv_domain->map_lock);
etnaviv_domain->pgtable.pgtable[index] = etnaviv_domain->bad_page_dma;
spin_unlock(&etnaviv_domain->map_lock);
return SZ_4K;
}