From 9504c24325ede003d111cd004e56803969764355 Mon Sep 17 00:00:00 2001 From: Koichiro Den Date: Tue, 21 Jul 2026 15:28:11 +0900 Subject: [PATCH] dmaengine: dw-edma-pcie: Add register offset match flag Add a match-data flag for devices whose DMA register block starts at an offset inside the mapped BAR. Existing Synopsys EDDA and AMD (Xilinx) MDB/CPM6 matches keep using the BAR mapping base directly. The offsets handled here come from static, trusted match data. Later metadata-derived offsets are validated when the endpoint DMA metadata path parses them at that trust boundary. No functional change intended. Reviewed-by: Frank Li Signed-off-by: Koichiro Den Link: https://patch.msgid.link/20260721062815.4117887-11-den@valinux.co.jp Signed-off-by: Vinod Koul --- drivers/dma/dw-edma/dw-edma-pcie.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/dma/dw-edma/dw-edma-pcie.c b/drivers/dma/dw-edma/dw-edma-pcie.c index 99ddb6e6da34..4b2757c1eda2 100644 --- a/drivers/dma/dw-edma/dw-edma-pcie.c +++ b/drivers/dma/dw-edma/dw-edma-pcie.c @@ -89,6 +89,7 @@ struct dw_edma_pcie_match_data { }; #define DW_EDMA_PCIE_F_DEVMEM_PHYS_OFF BIT(0) +#define DW_EDMA_PCIE_F_REG_OFFSET BIT(1) static const struct dw_edma_pcie_data snps_edda_data = { /* eDMA registers location */ @@ -464,6 +465,8 @@ static int dw_edma_pcie_probe(struct pci_dev *pdev, chip->reg_base = pcim_iomap_table(pdev)[dma_data->rg.bar]; if (!chip->reg_base) return -ENOMEM; + if (match->flags & DW_EDMA_PCIE_F_REG_OFFSET) + chip->reg_base += dma_data->rg.off; for (i = 0; i < chip->ll_wr_cnt && !dma_data->cfg_non_ll; i++) { struct dw_edma_region *ll_region = &chip->ll_region_wr[i];