diff options
author | Joerg Roedel <joerg.roedel@amd.com> | 2012-07-17 11:47:14 +0200 |
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committer | Joerg Roedel <joerg.roedel@amd.com> | 2012-07-17 11:47:14 +0200 |
commit | f9a4f063a88297e361fd6676986cf3e39b22de72 (patch) | |
tree | 50067d8fc72cc677db62de68da013039734a0c6c /drivers/iommu | |
parent | 9e971a03af736acc6f96c200c2626d3bcb3d6927 (diff) | |
download | blackbird-op-linux-f9a4f063a88297e361fd6676986cf3e39b22de72.tar.gz blackbird-op-linux-f9a4f063a88297e361fd6676986cf3e39b22de72.zip |
iommu/tegra: Don't call alloc_pdir with as->lock
Instead of taking as->lock before calling alloc_pdir() and
releasing it in that function to allocate memory, just take
the lock only in the alloc_pdir function and run the loop
without any lock held. This simplifies the complicated
lock->unlock->alloc->lock->unlock sequence into
alloc->lock->unlock.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'drivers/iommu')
-rw-r--r-- | drivers/iommu/tegra-smmu.c | 29 |
1 files changed, 16 insertions, 13 deletions
diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c index 68a15a0d5b8a..541d210cb421 100644 --- a/drivers/iommu/tegra-smmu.c +++ b/drivers/iommu/tegra-smmu.c @@ -553,11 +553,11 @@ static inline void put_signature(struct smmu_as *as, #endif /* - * Caller must lock/unlock as + * Caller must not hold as->lock */ -static int alloc_pdir(struct smmu_as *as, unsigned long *flags) +static int alloc_pdir(struct smmu_as *as) { - unsigned long *pdir; + unsigned long *pdir, flags; int pdn, err = 0; u32 val; struct smmu_device *smmu = as->smmu; @@ -565,13 +565,14 @@ static int alloc_pdir(struct smmu_as *as, unsigned long *flags) unsigned int *cnt; /* - * do the allocation outside the as->lock + * do the allocation, then grab as->lock */ - spin_unlock_irqrestore(&as->lock, *flags); cnt = devm_kzalloc(smmu->dev, - sizeof(cnt[0]) * SMMU_PDIR_COUNT, GFP_KERNEL); + sizeof(cnt[0]) * SMMU_PDIR_COUNT, + GFP_KERNEL); page = alloc_page(GFP_KERNEL | __GFP_DMA); - spin_lock_irqsave(&as->lock, *flags); + + spin_lock_irqsave(&as->lock, flags); if (as->pdir_page) { /* We raced, free the redundant */ @@ -603,9 +604,13 @@ static int alloc_pdir(struct smmu_as *as, unsigned long *flags) smmu_write(smmu, val, SMMU_TLB_FLUSH); FLUSH_SMMU_REGS(as->smmu); + spin_unlock_irqrestore(&as->lock, flags); + return 0; err_out: + spin_unlock_irqrestore(&as->lock, flags); + devm_kfree(smmu->dev, cnt); if (page) __free_page(page); @@ -809,13 +814,11 @@ static int smmu_iommu_domain_init(struct iommu_domain *domain) /* Look for a free AS with lock held */ for (i = 0; i < smmu->num_as; i++) { as = &smmu->as[i]; - spin_lock_irqsave(&as->lock, flags); if (!as->pdir_page) { - err = alloc_pdir(as, &flags); + err = alloc_pdir(as); if (!err) goto found; } - spin_unlock_irqrestore(&as->lock, flags); if (err != -EAGAIN) break; } @@ -824,7 +827,7 @@ static int smmu_iommu_domain_init(struct iommu_domain *domain) return err; found: - spin_lock(&smmu->lock); + spin_lock_irqsave(&smmu->lock, flags); /* Update PDIR register */ smmu_write(smmu, SMMU_PTB_ASID_CUR(as->asid), SMMU_PTB_ASID); @@ -832,12 +835,12 @@ found: SMMU_MK_PDIR(as->pdir_page, as->pdir_attr), SMMU_PTB_DATA); FLUSH_SMMU_REGS(smmu); - spin_unlock(&smmu->lock); + spin_unlock_irqrestore(&smmu->lock, flags); - spin_unlock_irqrestore(&as->lock, flags); domain->priv = as; dev_dbg(smmu->dev, "smmu_as@%p\n", as); + return 0; } |