From: Robin Murphy <robin.murphy@arm.com>
To: will@kernel.org, joro@8bytes.org
Cc: robh@kernel.org, tomeu.vizoso@collabora.com,
narmstrong@baylibre.com, steven.price@arm.com,
iommu@lists.linux-foundation.org,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH 3/3] iommu/io-pgtable-arm: Allow coherent walks for Mali
Date: Wed, 11 Sep 2019 15:42:09 +0100 [thread overview]
Message-ID: <8eb563978e7e872ddde45c0413e1a3f30b792658.1568211045.git.robin.murphy@arm.com> (raw)
In-Reply-To: <cover.1568211045.git.robin.murphy@arm.com>
Midgard GPUs have ACE-Lite master interfaces which allows systems to
integrate them in an I/O-coherent manner. It seems that from the GPU's
viewpoint, the rest of the system is its outer shareable domain, and it
will only emit snoop signals for outer shareable accesses. As such,
setting the TTBR_SHARE_OUTER bit does indeed get coherent pagetable
walks working nicely.
Making data accesses coherent seems to be more of a challenge...
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---
drivers/iommu/io-pgtable-arm.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c
index 77f41c9dd9be..2794d4661339 100644
--- a/drivers/iommu/io-pgtable-arm.c
+++ b/drivers/iommu/io-pgtable-arm.c
@@ -1061,6 +1061,9 @@ arm_mali_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg, void *cookie)
cfg->arm_mali_lpae_cfg.transtab = virt_to_phys(data->pgd) |
ARM_MALI_LPAE_TTBR_READ_INNER |
ARM_MALI_LPAE_TTBR_ADRMODE_TABLE;
+ if (cfg->coherent_walk)
+ cfg->arm_mali_lpae_cfg.transtab |= ARM_MALI_LPAE_TTBR_SHARE_OUTER;
+
return &data->iop;
out_free_data:
--
2.21.0.dirty
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next prev parent reply other threads:[~2019-09-11 14:43 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-11 14:42 [PATCH 0/3] iommu/io-pgtable-arm: Mali LPAE improvements Robin Murphy
2019-09-11 14:42 ` [PATCH 1/3] iommu/io-pgtable-arm: Correct Mali attributes Robin Murphy
2019-09-12 10:41 ` Steven Price
2019-09-11 14:42 ` [PATCH 2/3] iommu/io-pgtable-arm: Support more Mali configurations Robin Murphy
2019-09-12 10:47 ` Steven Price
2019-09-11 14:42 ` Robin Murphy [this message]
2019-09-12 10:53 ` [PATCH 3/3] iommu/io-pgtable-arm: Allow coherent walks for Mali Steven Price
2019-09-11 16:19 ` [PATCH 0/3] iommu/io-pgtable-arm: Mali LPAE improvements Neil Armstrong
2019-09-11 16:20 ` Will Deacon
2019-09-11 17:19 ` Robin Murphy
2019-09-19 8:30 ` Will Deacon
2019-09-23 8:17 ` Tomeu Vizoso
2019-09-23 11:04 ` Robin Murphy
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