[PATCH v2 3/4] iommu: dart: Write to all DART_T8020_STREAM_SELECT
flat view
STALE1321d
SUPERSEDED: 1 (0M)
From: Sven Peter <hidden>
Date: 2023-02-28 20:22:06
Also in:
asahi, linux-devicetree, linux-iommu, lkml
Subsystem:
arm/apple machine support, iommu subsystem, the rest · Maintainers:
Sven Peter, Janne Grunau, Joerg Roedel, Will Deacon, Linus Torvalds
Revision v2 of 4 in this series; 1 review trailer.
Revisions (4)
- v1 [diff vs current]
- v2 current
- v3 [diff vs current]
- v4 [diff vs current]
We're about to add support for a DART variant that use more than 16 streams and requires writing to two separate stream select registers when issuing TLB flushes. Acked-by: Hector Martin <redacted> Signed-off-by: Sven Peter <redacted> --- drivers/iommu/apple-dart.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/iommu/apple-dart.c b/drivers/iommu/apple-dart.c
index 7d8b2b90cdb6..7579c97a9062 100644
--- a/drivers/iommu/apple-dart.c
+++ b/drivers/iommu/apple-dart.c@@ -372,12 +372,14 @@ apple_dart_t8020_hw_stream_command(struct apple_dart_stream_map *stream_map, u32 command) { unsigned long flags; - int ret; + int ret, i; u32 command_reg; spin_lock_irqsave(&stream_map->dart->lock, flags); - writel(stream_map->sidmap[0], stream_map->dart->regs + DART_T8020_STREAM_SELECT); + for (i = 0; i < BITS_TO_U32(stream_map->dart->num_streams); i++) + writel(stream_map->sidmap[i], + stream_map->dart->regs + DART_T8020_STREAM_SELECT + 4 * i); writel(command, stream_map->dart->regs + DART_T8020_STREAM_COMMAND); ret = readl_poll_timeout_atomic(
--
2.25.1
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