kernel/git/stable/linux.git/drivers/gpu/host1x/hw, branch master

gpu: host1x: Add Tegra264 support

2026-07-16T18:31:33+00:00

Add device data and chip headers for Tegra264. Signed-off-by: Santosh BS Co-developed-by: Mikko Perttunen Signed-off-by: Mikko Perttunen Signed-off-by: Thierry Reding Link: https://patch.msgid.link/20260622-t264-host1x-v2-4-ff7364d9ff7b@nvidia.com

gpu: host1x: Annotate intentional syncpoint wrap-around

2026-07-16T18:29:47+00:00

Host1x syncpoints are 32-bit counters that roll over by design. To make that explicit in the code, use wrapping_* functions whenever arithmetic is done on syncpoint values. Atomic operations cannot be updated but a comment is added. Signed-off-by: Mikko Perttunen Signed-off-by: Thierry Reding Link: https://patch.msgid.link/20260609-b4-host1x-small-fixes-a-v1-6-7c1131c0b3ad@nvidia.com

gpu: host1x: Fix offset calculation in trace_write_gather

2026-07-16T18:29:11+00:00

When a gather longer than 2*TRACE_MAX_LENGTH (256) words is traced through host1x_cdma_push_gather, the reported BO offset drifts from the third iteration onward. Fix the calculation by properly calculating the value on each loop rather than accumulating. In reality, gathers tend to be pretty short so this is unlikely to ever have been observed. Fixes: b40d02bf96e0 ("gpu: host1x: Use struct host1x_bo pointers in traces") Signed-off-by: Mikko Perttunen Signed-off-by: Thierry Reding Link: https://patch.msgid.link/20260609-b4-host1x-small-fixes-a-v1-3-7c1131c0b3ad@nvidia.com

gpu: host1x: Wait for timeout worker completion on channel free

2026-07-16T18:28:50+00:00

cdma_timeout_destroy() used cancel_delayed_work() to cancel pending timeout work when destroying the CDMA. Usually this is fine, but there is a narrow race condition where the timeout handler has started execution but has not taken cdma->lock; the channel is freed causing cdma_stop to take cdma->lock and flush the channel; host1x_cdma_deinit then proceeds with deinitializing cdma while the handler is waiting to take cdma->lock. Therefore change cdma_timeout_destroy to use cancel_delayed_work_sync instead to ensure any pending timeout work completes before proceeding. Signed-off-by: Mikko Perttunen Signed-off-by: Thierry Reding Link: https://patch.msgid.link/20260609-b4-host1x-small-fixes-a-v1-1-7c1131c0b3ad@nvidia.com

gpu: host1x: Syncpoint interrupt performance optimization

2025-11-14T17:27:19+00:00

Optimize performance of syncpoint interrupt handling by reading the status register in 64-bit chunks when possible, and skipping processing when the read value is zero. Signed-off-by: Mikko Perttunen Signed-off-by: Thierry Reding Link: https://patch.msgid.link/20250917-host1x-syncpt-irq-perf-v2-1-736ef69b1347@nvidia.com

gpu: host1x: Wait prefences outside MLOCK

2025-09-11T16:56:35+00:00

The current submission opcode sequence first takes the engine MLOCK, and then switches to HOST1X class to wait prefences. This is fine while we only use a single channel per engine and there is no virtualization, since jobs are serialized on that one channel anyway. However, when that assumption doesn't hold, we are keeping the engine locked while not running anything on it while waiting for prefences to complete. To resolve this, execute wait commands in the beginning of the job outside the engine MLOCK. We still take the HOST1X MLOCK because recent hardware requires register opcodes to be executed within some MLOCK, but the hardware also allows unlimited channels to take the HOST1X MLOCK at the same time. Signed-off-by: Mikko Perttunen Signed-off-by: Thierry Reding Link: https://lore.kernel.org/r/20250708-host1x-wait-prefences-outside-mlock-v1-1-13e98044e35a@nvidia.com

gpu: host1x: Add MLOCK recovery for rest of engines

2024-08-29T18:14:29+00:00

Add class IDs / MLOCKs for MLOCK recovery for rest of engines present on Tegra234. Signed-off-by: Mikko Perttunen Signed-off-by: Thierry Reding Link: https://patchwork.freedesktop.org/patch/msgid/20240425050238.2943404-4-cyndis@kapsi.fi

gpu: host1x: Handle CDMA wraparound when debug printing

2024-08-29T18:14:29+00:00

During channel debug information dump, when printing CDMA opcodes, the circular nature of the CDMA pushbuffer wasn't being taken into account, sometimes accessing past the end. Change the printing to take this into account. Signed-off-by: Mikko Perttunen Signed-off-by: Thierry Reding Link: https://patchwork.freedesktop.org/patch/msgid/20240425050238.2943404-2-cyndis@kapsi.fi

gpu: host1x: Request syncpoint IRQs only during probe

2024-08-28T15:28:48+00:00

Syncpoint IRQs are currently requested in a code path that runs during resume. Due to this, we get multiple overlapping registered interrupt handlers as host1x is suspended and resumed. Rearrange interrupt code to only request IRQs during initialization. Signed-off-by: Mikko Perttunen Signed-off-by: Thierry Reding Link: https://patchwork.freedesktop.org/patch/msgid/20240531070719.2138-1-cyndis@kapsi.fi

gpu: host1x: Syncpoint interrupt sharding

2023-10-11T20:52:44+00:00

Support sharded syncpoint interrupts on Tegra234+. This feature allows specifying one of eight interrupt lines for each syncpoint to lower processing latency of syncpoint threshold interrupts. Signed-off-by: Mikko Perttunen Signed-off-by: Thierry Reding Link: https://patchwork.freedesktop.org/patch/msgid/20230901114008.672433-1-cyndis@kapsi.fi