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iommu/io-pgtable: Remove non-strict quirk

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IO_PGTABLE_QUIRK_NON_STRICT was never a very comfortable fit, since it's
not a quirk of the pagetable format itself. Now that we have a more
appropriate way to convey non-strict unmaps, though, this last of the
non-quirk quirks can also go, and with the flush queue code also now
enforcing its own ordering we can have a lovely cleanup all round.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/155b5c621cd8936472e273a8b07a182f62c6c20d.1628682049.git.robin.murphy@arm.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Robin Murphy 2021-08-11 13:21:29 +01:00 committed by Joerg Roedel
parent 7a7c5badf8
commit a8e5f04458
5 changed files with 4 additions and 31 deletions
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3
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
View File

@ -2174,9 +2174,6 @@ static int arm_smmu_domain_finalise(struct iommu_domain *domain,
.iommu_dev = smmu->dev,
};
if (!iommu_get_dma_strict(domain))
pgtbl_cfg.quirks |= IO_PGTABLE_QUIRK_NON_STRICT;
pgtbl_ops = alloc_io_pgtable_ops(fmt, &pgtbl_cfg, smmu_domain);
if (!pgtbl_ops)
return -ENOMEM;

3
drivers/iommu/arm/arm-smmu/arm-smmu.c
View File

@ -765,9 +765,6 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain,
.iommu_dev = smmu->dev,
};
if (!iommu_get_dma_strict(domain))
pgtbl_cfg.quirks |= IO_PGTABLE_QUIRK_NON_STRICT;
if (smmu->impl && smmu->impl->init_context) {
ret = smmu->impl->init_context(smmu_domain, &pgtbl_cfg, dev);
if (ret)

12
drivers/iommu/io-pgtable-arm-v7s.c
View File

@ -700,14 +700,7 @@ static size_t __arm_v7s_unmap(struct arm_v7s_io_pgtable *data,
ARM_V7S_BLOCK_SIZE(lvl + 1));
ptep = iopte_deref(pte[i], lvl, data);
__arm_v7s_free_table(ptep, lvl + 1, data);
} else if (iop->cfg.quirks & IO_PGTABLE_QUIRK_NON_STRICT) {
/*
* Order the PTE update against queueing the IOVA, to
* guarantee that a flush callback from a different CPU
* has observed it before the TLBIALL can be issued.
*/
smp_wmb();
} else {
} else if (!gather->queued) {
io_pgtable_tlb_add_page(iop, gather, iova, blk_size);
}
iova += blk_size;
@ -791,8 +784,7 @@ static struct io_pgtable *arm_v7s_alloc_pgtable(struct io_pgtable_cfg *cfg,
if (cfg->quirks & ~(IO_PGTABLE_QUIRK_ARM_NS |
IO_PGTABLE_QUIRK_NO_PERMS |
IO_PGTABLE_QUIRK_ARM_MTK_EXT |
IO_PGTABLE_QUIRK_NON_STRICT))
IO_PGTABLE_QUIRK_ARM_MTK_EXT))
return NULL;
/* If ARM_MTK_4GB is enabled, the NO_PERMS is also expected. */

12
drivers/iommu/io-pgtable-arm.c
View File

@ -638,14 +638,7 @@ static size_t __arm_lpae_unmap(struct arm_lpae_io_pgtable *data,
io_pgtable_tlb_flush_walk(iop, iova + i * size, size,
ARM_LPAE_GRANULE(data));
__arm_lpae_free_pgtable(data, lvl + 1, iopte_deref(pte, data));
} else if (iop->cfg.quirks & IO_PGTABLE_QUIRK_NON_STRICT) {
/*
* Order the PTE update against queueing the IOVA, to
* guarantee that a flush callback from a different CPU
* has observed it before the TLBIALL can be issued.
*/
smp_wmb();
} else {
} else if (!gather->queued) {
io_pgtable_tlb_add_page(iop, gather, iova + i * size, size);
}
@ -825,7 +818,6 @@ arm_64_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg, void *cookie)
bool tg1;
if (cfg->quirks & ~(IO_PGTABLE_QUIRK_ARM_NS |
IO_PGTABLE_QUIRK_NON_STRICT |
IO_PGTABLE_QUIRK_ARM_TTBR1 |
IO_PGTABLE_QUIRK_ARM_OUTER_WBWA))
return NULL;
@ -929,7 +921,7 @@ arm_64_lpae_alloc_pgtable_s2(struct io_pgtable_cfg *cfg, void *cookie)
typeof(&cfg->arm_lpae_s2_cfg.vtcr) vtcr = &cfg->arm_lpae_s2_cfg.vtcr;
/* The NS quirk doesn't apply at stage 2 */
if (cfg->quirks & ~(IO_PGTABLE_QUIRK_NON_STRICT))
if (cfg->quirks)
return NULL;
data = arm_lpae_alloc_pgtable(cfg);

5
include/linux/io-pgtable.h
View File

@ -73,10 +73,6 @@ struct io_pgtable_cfg {
* to support up to 35 bits PA where the bit32, bit33 and bit34 are
* encoded in the bit9, bit4 and bit5 of the PTE respectively.
*
* IO_PGTABLE_QUIRK_NON_STRICT: Skip issuing synchronous leaf TLBIs
* on unmap, for DMA domains using the flush queue mechanism for
* delayed invalidation.
*
* IO_PGTABLE_QUIRK_ARM_TTBR1: (ARM LPAE format) Configure the table
* for use in the upper half of a split address space.
*
@ -86,7 +82,6 @@ struct io_pgtable_cfg {
#define IO_PGTABLE_QUIRK_ARM_NS BIT(0)
#define IO_PGTABLE_QUIRK_NO_PERMS BIT(1)
#define IO_PGTABLE_QUIRK_ARM_MTK_EXT BIT(3)
#define IO_PGTABLE_QUIRK_NON_STRICT BIT(4)
#define IO_PGTABLE_QUIRK_ARM_TTBR1 BIT(5)
#define IO_PGTABLE_QUIRK_ARM_OUTER_WBWA BIT(6)
unsigned long quirks;