Re: [PATCH 5/5] iommu/dart: Assert !locked when configuring

From: Robin Murphy
Date: Tue Feb 11 2025 - 13:41:29 EST


On 2025-02-10 7:39 pm, Alyssa Rosenzweig wrote:
Configuration is only possible and needed for non-locked DARTs and will
fail for locked DARTs. We cannot try -- assert that we do not.

Except now we absolutely will - if a locked DART and its client device are advertised to Linux, instead of gracefully refusing to touch it, we'll now attach the client to a DMA domain, firing a barrage of multiple WARNs in the process, and give it DMA ops which still cannot work. I'm not really convinced this series on its own leaves us in a better position than we're already in now... :/

How hideous is the rest of what's required to actually make this usable?

Thanks,
Robin.

Signed-off-by: Alyssa Rosenzweig <alyssa@xxxxxxxxxxxxx>
---
drivers/iommu/apple-dart.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/apple-dart.c b/drivers/iommu/apple-dart.c
index 29b627b38e8c37afd2b6a72865f43d24b633834a..87eb87bb2f5158d000a2c2fc801b722a2262c941 100644
--- a/drivers/iommu/apple-dart.c
+++ b/drivers/iommu/apple-dart.c
@@ -309,6 +309,7 @@ apple_dart_hw_enable_translation(struct apple_dart_stream_map *stream_map)
struct apple_dart *dart = stream_map->dart;
int sid;
+ WARN_ON(stream_map->dart->locked);
for_each_set_bit(sid, stream_map->sidmap, dart->num_streams)
writel(dart->hw->tcr_enabled, dart->regs + DART_TCR(dart, sid));
}
@@ -318,6 +319,7 @@ static void apple_dart_hw_disable_dma(struct apple_dart_stream_map *stream_map)
struct apple_dart *dart = stream_map->dart;
int sid;
+ WARN_ON(stream_map->dart->locked);
for_each_set_bit(sid, stream_map->sidmap, dart->num_streams)
writel(dart->hw->tcr_disabled, dart->regs + DART_TCR(dart, sid));
}
@@ -328,7 +330,7 @@ apple_dart_hw_enable_bypass(struct apple_dart_stream_map *stream_map)
struct apple_dart *dart = stream_map->dart;
int sid;
- WARN_ON(!stream_map->dart->supports_bypass);
+ WARN_ON(stream_map->dart->locked || !stream_map->dart->supports_bypass);
for_each_set_bit(sid, stream_map->sidmap, dart->num_streams)
writel(dart->hw->tcr_bypass,
dart->regs + DART_TCR(dart, sid));
@@ -340,6 +342,7 @@ static void apple_dart_hw_set_ttbr(struct apple_dart_stream_map *stream_map,
struct apple_dart *dart = stream_map->dart;
int sid;
+ WARN_ON(stream_map->dart->locked);
WARN_ON(paddr & ((1 << dart->hw->ttbr_shift) - 1));
for_each_set_bit(sid, stream_map->sidmap, dart->num_streams)
writel(dart->hw->ttbr_valid |
@@ -353,6 +356,7 @@ static void apple_dart_hw_clear_ttbr(struct apple_dart_stream_map *stream_map,
struct apple_dart *dart = stream_map->dart;
int sid;
+ WARN_ON(stream_map->dart->locked);
for_each_set_bit(sid, stream_map->sidmap, dart->num_streams)
writel(0, dart->regs + DART_TTBR(dart, sid, idx));
}