From patchwork Wed Jan 26 19:50:39 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Prabhakar X-Patchwork-Id: 12725687 X-Patchwork-Delegate: lorenzo.pieralisi@arm.com Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DE31AC63684 for ; Wed, 26 Jan 2022 19:51:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244539AbiAZTvC (ORCPT ); Wed, 26 Jan 2022 14:51:02 -0500 Received: from relmlor1.renesas.com ([210.160.252.171]:46865 "EHLO relmlie5.idc.renesas.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S231611AbiAZTvB (ORCPT ); Wed, 26 Jan 2022 14:51:01 -0500 X-IronPort-AV: E=Sophos;i="5.88,319,1635174000"; d="scan'208";a="107766003" Received: from unknown (HELO relmlir5.idc.renesas.com) ([10.200.68.151]) by relmlie5.idc.renesas.com with ESMTP; 27 Jan 2022 04:51:00 +0900 Received: from localhost.localdomain (unknown [10.226.36.204]) by relmlir5.idc.renesas.com (Postfix) with ESMTP id C97AF4008541; Thu, 27 Jan 2022 04:50:57 +0900 (JST) From: Lad Prabhakar To: Kishon Vijay Abraham I , Bjorn Helgaas , Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilczy?= =?utf-8?q?=C5=84ski?= , Arnd Bergmann , Greg Kroah-Hartman , Marek Vasut , Yoshihiro Shimoda , Rob Herring , linux-pci@vger.kernel.org, linux-renesas-soc@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Prabhakar , Biju Das , Lad Prabhakar Subject: [RFC PATCH 1/5] PCI: endpoint: Add ops and flag to support internal DMAC Date: Wed, 26 Jan 2022 19:50:39 +0000 Message-Id: <20220126195043.28376-2-prabhakar.mahadev-lad.rj@bp.renesas.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220126195043.28376-1-prabhakar.mahadev-lad.rj@bp.renesas.com> References: <20220126195043.28376-1-prabhakar.mahadev-lad.rj@bp.renesas.com> Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org 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 --- 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);