Some GPUs do not support using DMA to transfer code/data from system memory to Falcon memory, and instead must use programmed I/O (PIO). Add a function to the Falcon HAL to indicate whether a given GPU's Falcons support DMA for this purpose.
Signed-off-by: Timur Tabi <[email protected]> --- drivers/gpu/nova-core/falcon.rs | 7 +++++++ drivers/gpu/nova-core/falcon/hal.rs | 3 +++ drivers/gpu/nova-core/falcon/hal/ga102.rs | 4 ++++ drivers/gpu/nova-core/falcon/hal/tu102.rs | 4 ++++ 4 files changed, 18 insertions(+) diff --git a/drivers/gpu/nova-core/falcon.rs b/drivers/gpu/nova-core/falcon.rs index f2da6a4a9d36..2770d608a2cf 100644 --- a/drivers/gpu/nova-core/falcon.rs +++ b/drivers/gpu/nova-core/falcon.rs @@ -631,6 +631,13 @@ pub(crate) fn is_riscv_active(&self, bar: &Bar0) -> bool { self.hal.is_riscv_active(bar) } + /// Check if this Falcon supports DMA for loading firmware. + /// + /// Returns `true` if DMA is supported, `false` if PIO must be used instead. + pub(crate) fn supports_dma(&self) -> bool { + self.hal.supports_dma() + } + /// Write the application version to the OS register. pub(crate) fn write_os_version(&self, bar: &Bar0, app_version: u32) { regs::NV_PFALCON_FALCON_OS::default() diff --git a/drivers/gpu/nova-core/falcon/hal.rs b/drivers/gpu/nova-core/falcon/hal.rs index 7a6610e9d0a8..a760620221c3 100644 --- a/drivers/gpu/nova-core/falcon/hal.rs +++ b/drivers/gpu/nova-core/falcon/hal.rs @@ -48,6 +48,9 @@ fn signature_reg_fuse_version( /// Reset the falcon engine. fn reset_eng(&self, bar: &Bar0) -> Result; + + /// Returns true of this Falcon supports DMA transfer from system memory to Falcon memory + fn supports_dma(&self) -> bool; } /// Returns a boxed falcon HAL adequate for `chipset`. diff --git a/drivers/gpu/nova-core/falcon/hal/ga102.rs b/drivers/gpu/nova-core/falcon/hal/ga102.rs index 232d51a4921f..684ca72b7cfe 100644 --- a/drivers/gpu/nova-core/falcon/hal/ga102.rs +++ b/drivers/gpu/nova-core/falcon/hal/ga102.rs @@ -160,4 +160,8 @@ fn reset_eng(&self, bar: &Bar0) -> Result { Ok(()) } + + fn supports_dma(&self) -> bool { + true + } } diff --git a/drivers/gpu/nova-core/falcon/hal/tu102.rs b/drivers/gpu/nova-core/falcon/hal/tu102.rs index 19a8b49ca2cd..d8ec914bd3f8 100644 --- a/drivers/gpu/nova-core/falcon/hal/tu102.rs +++ b/drivers/gpu/nova-core/falcon/hal/tu102.rs @@ -71,4 +71,8 @@ fn reset_eng(&self, bar: &Bar0) -> Result { Ok(()) } + + fn supports_dma(&self) -> bool { + false + } } -- 2.52.0
