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Tue, 26 Mar 2024 23:38:02 -0700 (PDT) From: Manivannan Sadhasivam Date: Wed, 27 Mar 2024 12:05:51 +0530 Subject: [PATCH v11 5/8] PCI: dwc: ep: Introduce dw_pcie_ep_cleanup() API for drivers supporting PERST# Precedence: bulk X-Mailing-List: linux-renesas-soc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240327-pci-dbi-rework-v11-5-6f5259f90673@linaro.org> References: <20240327-pci-dbi-rework-v11-0-6f5259f90673@linaro.org> In-Reply-To: <20240327-pci-dbi-rework-v11-0-6f5259f90673@linaro.org> To: Jingoo Han , Gustavo Pimentel , Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilczy?= =?utf-8?q?=C5=84ski?= , Rob Herring , Bjorn Helgaas , Marek Vasut , Yoshihiro Shimoda , Thierry Reding , Jonathan Hunter , Kishon Vijay Abraham I , Vidya Sagar , Vignesh Raghavendra , Richard Zhu , Lucas Stach , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Minghuan Lian , Mingkai Hu , Roy Zang , Kunihiko Hayashi , Masami Hiramatsu , Kishon Vijay Abraham I , Jesper Nilsson , Srikanth Thokala , Shawn Lin , Heiko Stuebner Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-tegra@vger.kernel.org, linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, Niklas Cassel , linux-arm-kernel@axis.com, linux-rockchip@lists.infradead.org, Manivannan Sadhasivam , Frank Li X-Mailer: b4 0.12.4 X-Developer-Signature: v=1; a=openpgp-sha256; l=4250; i=manivannan.sadhasivam@linaro.org; h=from:subject:message-id; bh=qsrXEYDJ7iRM5G49lWMuNsUTn79ZQLOBCbqctpAd/Xc=; b=owEBbQGS/pANAwAKAVWfEeb+kc71AcsmYgBmA75WoMjoLUGDerPhNIv6VyZTOayQ0uU/PY+4B kAPbZoTMMyJATMEAAEKAB0WIQRnpUMqgUjL2KRYJ5dVnxHm/pHO9QUCZgO+VgAKCRBVnxHm/pHO 9ZymB/42xHgi+oA0QmT/QC4mzKmaeoOjY/JSPU1j3L93vbjOssxOJeezhE7Swp/n6lyaHPxoY+r ZUoL9JO8pKFg9cX69Kz2fjso7GFmQTr+32IhNeaQjJKvCFAgudmbh1oJodl/NyDHnbqkGnprS2d L5o+eAB6f4MmYT6ecfcpzH4aHPJzkjC5Tn8H16P4w7vjT63h0WZCZe2RRRTaI5ieaRGE2Gm1H49 /tjWHhmjJlptTfyF0MFN9Qfy2Bba9LzKYjsPZrWo/d1ip0fYBaYxDBHdlShr0Ea4mHZRVM+gOn8 W6QF6ehLfXxKTDiMLCJ3CLVqU3YxefS9Wy+lpHGuCAJcVkzG X-Developer-Key: i=manivannan.sadhasivam@linaro.org; a=openpgp; fpr=C668AEC3C3188E4C611465E7488550E901166008 For DWC glue drivers supporting PERST# (currently Qcom and Tegra194), some of the DWC resources like eDMA should be cleaned up during the PERST# assert time. So let's introduce a dw_pcie_ep_cleanup() API that could be called by these drivers to cleanup the DWC specific resources. Currently, it just removes eDMA. Reported-by: Niklas Cassel Closes: https://lore.kernel.org/linux-pci/ZWYmX8Y%2F7Q9WMxES@x1-carbon Reviewed-by: Frank Li Reviewed-by: Niklas Cassel Signed-off-by: Manivannan Sadhasivam --- drivers/pci/controller/dwc/pcie-designware-ep.c | 19 +++++++++++++++++-- drivers/pci/controller/dwc/pcie-designware.h | 5 +++++ drivers/pci/controller/dwc/pcie-qcom-ep.c | 1 + drivers/pci/controller/dwc/pcie-tegra194.c | 2 ++ 4 files changed, 25 insertions(+), 2 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c index 7ff2015736ef..7509fa1d1e7d 100644 --- a/drivers/pci/controller/dwc/pcie-designware-ep.c +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c @@ -617,6 +617,22 @@ int dw_pcie_ep_raise_msix_irq(struct dw_pcie_ep *ep, u8 func_no, return 0; } +/** + * dw_pcie_ep_cleanup - Cleanup DWC EP resources after fundamental reset + * @ep: DWC EP device + * + * Cleans up the DWC EP specific resources like eDMA etc... after fundamental + * reset like PERST#. Note that this API is only applicable for drivers + * supporting PERST# or any other methods of fundamental reset. + */ +void dw_pcie_ep_cleanup(struct dw_pcie_ep *ep) +{ + struct dw_pcie *pci = to_dw_pcie_from_ep(ep); + + dw_pcie_edma_remove(pci); +} +EXPORT_SYMBOL_GPL(dw_pcie_ep_cleanup); + /** * dw_pcie_ep_deinit - Deinitialize the endpoint device * @ep: DWC EP device @@ -626,10 +642,9 @@ int dw_pcie_ep_raise_msix_irq(struct dw_pcie_ep *ep, u8 func_no, */ void dw_pcie_ep_deinit(struct dw_pcie_ep *ep) { - struct dw_pcie *pci = to_dw_pcie_from_ep(ep); struct pci_epc *epc = ep->epc; - dw_pcie_edma_remove(pci); + dw_pcie_ep_cleanup(ep); pci_epc_mem_free_addr(epc, ep->msi_mem_phys, ep->msi_mem, epc->mem->window.page_size); diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h index 61465203bb60..351d2fe3ea4d 100644 --- a/drivers/pci/controller/dwc/pcie-designware.h +++ b/drivers/pci/controller/dwc/pcie-designware.h @@ -672,6 +672,7 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep); int dw_pcie_ep_init_complete(struct dw_pcie_ep *ep); void dw_pcie_ep_init_notify(struct dw_pcie_ep *ep); void dw_pcie_ep_deinit(struct dw_pcie_ep *ep); +void dw_pcie_ep_cleanup(struct dw_pcie_ep *ep); int dw_pcie_ep_raise_intx_irq(struct dw_pcie_ep *ep, u8 func_no); int dw_pcie_ep_raise_msi_irq(struct dw_pcie_ep *ep, u8 func_no, u8 interrupt_num); @@ -705,6 +706,10 @@ static inline void dw_pcie_ep_deinit(struct dw_pcie_ep *ep) { } +static inline void dw_pcie_ep_cleanup(struct dw_pcie_ep *ep) +{ +} + static inline int dw_pcie_ep_raise_intx_irq(struct dw_pcie_ep *ep, u8 func_no) { return 0; diff --git a/drivers/pci/controller/dwc/pcie-qcom-ep.c b/drivers/pci/controller/dwc/pcie-qcom-ep.c index 36e5e80cd22f..59b1c0110288 100644 --- a/drivers/pci/controller/dwc/pcie-qcom-ep.c +++ b/drivers/pci/controller/dwc/pcie-qcom-ep.c @@ -507,6 +507,7 @@ static void qcom_pcie_perst_assert(struct dw_pcie *pci) return; } + dw_pcie_ep_cleanup(&pci->ep); qcom_pcie_disable_resources(pcie_ep); pcie_ep->link_status = QCOM_PCIE_EP_LINK_DISABLED; } diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c index 7afa9e9aabe2..68bfeed3429b 100644 --- a/drivers/pci/controller/dwc/pcie-tegra194.c +++ b/drivers/pci/controller/dwc/pcie-tegra194.c @@ -1715,6 +1715,8 @@ static void pex_ep_event_pex_rst_assert(struct tegra_pcie_dw *pcie) if (ret) dev_err(pcie->dev, "Failed to go Detect state: %d\n", ret); + dw_pcie_ep_cleanup(&pcie->pci.ep); + reset_control_assert(pcie->core_rst); tegra_pcie_disable_phy(pcie);