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charset="utf-8" Some DesignWare PCIe endpoint controllers integrate a DesignWare eDMA instance and allocate per-channel linked-list (LL) regions. Remote eDMA providers may need to expose those LL regions to the host so it can build descriptors against the remote view. Export dwc_pcie_edma_get_ll_region() to allow higher-level code to query the LL region (base/size) for a given EPC, transfer direction (DMA_DEV_TO_MEM / DMA_MEM_TO_DEV) and hardware channel identifier. The helper maps the request to the appropriate read/write LL region depending on whether the integrated eDMA is the local or the remote view. Signed-off-by: Koichiro Den --- drivers/pci/controller/dwc/pcie-designware.c | 45 ++++++++++++++++++++ include/linux/pcie-dwc-edma.h | 33 ++++++++++++++ 2 files changed, 78 insertions(+) diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/con= troller/dwc/pcie-designware.c index bbaeecce199a..e8617873e832 100644 --- a/drivers/pci/controller/dwc/pcie-designware.c +++ b/drivers/pci/controller/dwc/pcie-designware.c @@ -1369,3 +1369,48 @@ int dwc_pcie_edma_get_reg_window(struct pci_epc *epc= , phys_addr_t *phys, return 0; } EXPORT_SYMBOL_GPL(dwc_pcie_edma_get_reg_window); + +int dwc_pcie_edma_get_ll_region(struct pci_epc *epc, + enum dma_transfer_direction dir, int hw_id, + struct dw_edma_region *region) +{ + struct dw_edma_chip *chip; + struct dw_pcie_ep *ep; + struct dw_pcie *pci; + bool dir_read; + + if (!epc || !region) + return -EINVAL; + if (dir !=3D DMA_DEV_TO_MEM && dir !=3D DMA_MEM_TO_DEV) + return -EINVAL; + if (hw_id < 0) + return -EINVAL; + + ep =3D epc_get_drvdata(epc); + if (!ep) + return -ENODEV; + + pci =3D to_dw_pcie_from_ep(ep); + chip =3D &pci->edma; + + if (!chip->dev) + return -ENODEV; + + if (chip->flags & DW_EDMA_CHIP_LOCAL) + dir_read =3D (dir =3D=3D DMA_DEV_TO_MEM); + else + dir_read =3D (dir =3D=3D DMA_MEM_TO_DEV); + + if (dir_read) { + if (hw_id >=3D chip->ll_rd_cnt) + return -EINVAL; + *region =3D chip->ll_region_rd[hw_id]; + } else { + if (hw_id >=3D chip->ll_wr_cnt) + return -EINVAL; + *region =3D chip->ll_region_wr[hw_id]; + } + + return 0; +} +EXPORT_SYMBOL_GPL(dwc_pcie_edma_get_ll_region); diff --git a/include/linux/pcie-dwc-edma.h b/include/linux/pcie-dwc-edma.h index a5b0595603f4..36afb4df1998 100644 --- a/include/linux/pcie-dwc-edma.h +++ b/include/linux/pcie-dwc-edma.h @@ -6,6 +6,8 @@ #ifndef LINUX_PCIE_DWC_EDMA_H #define LINUX_PCIE_DWC_EDMA_H =20 +#include +#include #include #include #include @@ -27,6 +29,29 @@ */ int dwc_pcie_edma_get_reg_window(struct pci_epc *epc, phys_addr_t *phys, resource_size_t *sz); + +/** + * dwc_pcie_edma_get_ll_region() - get linked-list (LL) region for a HW ch= annel + * @epc: EPC device associated with the integrated eDMA instance + * @dir: DMA transfer direction (%DMA_DEV_TO_MEM or %DMA_MEM_TO_DEV) + * @hw_id: hardware channel identifier (equals to dw_edma_chan.id) + * @region: pointer to a region descriptor to fill in + * + * Some integrated DesignWare eDMA instances allocate per-channel linked-l= ist + * (LL) regions for descriptor storage. This helper returns the LL region + * corresponding to @dir and @hw_id. + * + * The mapping between @dir and the underlying eDMA read/write LL region + * depends on whether the integrated eDMA instance represents a local or a + * remote view. + * + * Return: 0 on success, -EINVAL on invalid arguments (including out-of-ra= nge + * @hw_id), or -ENODEV if the integrated eDMA instance is not pres= ent + * or not initialized. + */ +int dwc_pcie_edma_get_ll_region(struct pci_epc *epc, + enum dma_transfer_direction dir, int hw_id, + struct dw_edma_region *region); #else static inline int dwc_pcie_edma_get_reg_window(struct pci_epc *epc, phys_addr_t *phys, @@ -34,6 +59,14 @@ dwc_pcie_edma_get_reg_window(struct pci_epc *epc, phys_a= ddr_t *phys, { return -ENODEV; } + +static inline int +dwc_pcie_edma_get_ll_region(struct pci_epc *epc, + enum dma_transfer_direction dir, int hw_id, + struct dw_edma_region *region) +{ + return -ENODEV; +} #endif /* CONFIG_PCIE_DW */ =20 #endif /* LINUX_PCIE_DWC_EDMA_H */ --=20 2.51.0