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8c5b23d070
Add the bulk data plane for the four programmable endpoints. The gadget driver queues IN data through the descriptor-list DMA ring and arms OUT buffers through the single-stage DMA registers; host bulk transactions are served from / delivered into those. The DMA mode is taken from EP_DMA_CTRL.DESC_OP_EN: IN endpoints use the descriptor-list ring, OUT endpoints use single-stage buffers. A transfer larger than one host packet is served across several polls, with the host packet parked (USB_RET_ASYNC) until the gadget queues (IN) or arms (OUT) more data, then completed from the matching DMA kick. With this the gadget data endpoints work, e.g. a mass-storage gadget can be enumerated and read/written end to end. Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com> Reviewed-by: Cédric Le Goater <clg@redhat.com> Link: https://lore.kernel.org/qemu-devel/20260902021542.3194812-4-jamin_lin@aspeedtech.com Signed-off-by: Cédric Le Goater <clg@redhat.com>