Re: [PATCH 3/4] iommu: dart: Write to all DART_T8020_STREAM_SELECT
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From: Hector Martin <hidden>
Date: 2023-01-28 11:45:50
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On 28/01/2023 20.11, Sven Peter wrote:
quoted hunk ↗ jump to hunk
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. 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(
Acked-by: Hector Martin <redacted> - Hector _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel