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Message-Id: <20220126195043.28376-2-prabhakar.mahadev-lad.rj@bp.renesas.com>
Date: Wed, 26 Jan 2022 19:50:39 +0000
From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
To: Kishon Vijay Abraham I <kishon@...com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
Krzysztof Wilczyński <kw@...ux.com>,
Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Marek Vasut <marek.vasut+renesas@...il.com>,
Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
Rob Herring <robh@...nel.org>, linux-pci@...r.kernel.org,
linux-renesas-soc@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
Prabhakar <prabhakar.csengg@...il.com>,
Biju Das <biju.das.jz@...renesas.com>,
Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: [RFC PATCH 1/5] PCI: endpoint: Add ops and flag to support internal DMAC
Add flag to indicate if PCIe EP supports internal DMAC and also add a
wrapper function which invokes dmac_transfer() callback which lands
in the PCIe EP driver.
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
---
drivers/pci/endpoint/pci-epf-core.c | 32 +++++++++++++++++++++++++++++
include/linux/pci-epc.h | 8 ++++++++
include/linux/pci-epf.h | 7 +++++++
3 files changed, 47 insertions(+)
diff --git a/drivers/pci/endpoint/pci-epf-core.c b/drivers/pci/endpoint/pci-epf-core.c
index 9ed556936f48..f70576d0d4b2 100644
--- a/drivers/pci/endpoint/pci-epf-core.c
+++ b/drivers/pci/endpoint/pci-epf-core.c
@@ -239,6 +239,38 @@ void pci_epf_remove_vepf(struct pci_epf *epf_pf, struct pci_epf *epf_vf)
}
EXPORT_SYMBOL_GPL(pci_epf_remove_vepf);
+/**
+ * pci_epf_internal_dmac_xfr() - transfer data between EPC and remote PCIe RC
+ * @epf: the EPF device that performs the data transfer operation
+ * @dma_dst: The destination address of the data transfer. It can be a physical
+ * address given by pci_epc_mem_alloc_addr or DMA mapping APIs.
+ * @dma_src: The source address of the data transfer. It can be a physical
+ * address given by pci_epc_mem_alloc_addr or DMA mapping APIs.
+ * @len: The size of the data transfer
+ *
+ * Invoke to transfer data between EPC and remote PCIe RC using internal dmac.
+ */
+int pci_epf_internal_dmac_xfr(struct pci_epf *epf, dma_addr_t dma_dst,
+ dma_addr_t dma_src, size_t len,
+ enum pci_epf_xfr_direction dir)
+{
+ struct pci_epc *epc = epf->epc;
+ int ret;
+
+ if (IS_ERR_OR_NULL(epc) || IS_ERR_OR_NULL(epf))
+ return -EINVAL;
+
+ if (!epc->ops->dmac_transfer)
+ return -EINVAL;
+
+ mutex_lock(&epf->lock);
+ ret = epc->ops->dmac_transfer(epc, epf, dma_dst, dma_src, len, dir);
+ mutex_unlock(&epf->lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(pci_epf_internal_dmac_xfr);
+
/**
* pci_epf_free_space() - free the allocated PCI EPF register space
* @epf: the EPF device from whom to free the memory
diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
index a48778e1a4ee..b55dacd09e1e 100644
--- a/include/linux/pci-epc.h
+++ b/include/linux/pci-epc.h
@@ -58,6 +58,7 @@ pci_epc_interface_string(enum pci_epc_interface_type type)
* @map_msi_irq: ops to map physical address to MSI address and return MSI data
* @start: ops to start the PCI link
* @stop: ops to stop the PCI link
+ * @dmac_transfer: ops to transfer data using internal DMAC
* @get_features: ops to get the features supported by the EPC
* @owner: the module owner containing the ops
*/
@@ -86,6 +87,9 @@ struct pci_epc_ops {
u32 *msi_addr_offset);
int (*start)(struct pci_epc *epc);
void (*stop)(struct pci_epc *epc);
+ int (*dmac_transfer)(struct pci_epc *epc, struct pci_epf *epf,
+ dma_addr_t dma_dst, dma_addr_t dma_src,
+ size_t len, enum pci_epf_xfr_direction dir);
const struct pci_epc_features* (*get_features)(struct pci_epc *epc,
u8 func_no, u8 vfunc_no);
struct module *owner;
@@ -159,6 +163,8 @@ struct pci_epc {
* for initialization
* @msi_capable: indicate if the endpoint function has MSI capability
* @msix_capable: indicate if the endpoint function has MSI-X capability
+ * @internal_dmac: indicate if the endpoint function has internal DMAC
+ * @internal_dmac_mask: indicates the DMA mask to be applied for the device
* @reserved_bar: bitmap to indicate reserved BAR unavailable to function driver
* @bar_fixed_64bit: bitmap to indicate fixed 64bit BARs
* @bar_fixed_size: Array specifying the size supported by each BAR
@@ -169,6 +175,8 @@ struct pci_epc_features {
unsigned int core_init_notifier : 1;
unsigned int msi_capable : 1;
unsigned int msix_capable : 1;
+ unsigned int internal_dmac : 1;
+ u64 internal_dmac_mask;
u8 reserved_bar;
u8 bar_fixed_64bit;
u64 bar_fixed_size[PCI_STD_NUM_BARS];
diff --git a/include/linux/pci-epf.h b/include/linux/pci-epf.h
index 009a07147c61..78d661db085d 100644
--- a/include/linux/pci-epf.h
+++ b/include/linux/pci-epf.h
@@ -32,6 +32,11 @@ enum pci_barno {
BAR_5,
};
+enum pci_epf_xfr_direction {
+ PCIE_TO_INTERNAL,
+ INTERNAL_TO_PCIE,
+};
+
/**
* struct pci_epf_header - represents standard configuration header
* @vendorid: identifies device manufacturer
@@ -209,6 +214,8 @@ void pci_epf_free_space(struct pci_epf *epf, void *addr, enum pci_barno bar,
enum pci_epc_interface_type type);
int pci_epf_bind(struct pci_epf *epf);
void pci_epf_unbind(struct pci_epf *epf);
+int pci_epf_internal_dmac_xfr(struct pci_epf *epf, dma_addr_t dma_dst, dma_addr_t dma_src,
+ size_t len, enum pci_epf_xfr_direction dir);
struct config_group *pci_epf_type_add_cfs(struct pci_epf *epf,
struct config_group *group);
int pci_epf_add_vepf(struct pci_epf *epf_pf, struct pci_epf *epf_vf);
--
2.25.1
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