linux-kernel - [PATCH v10 5/8] PCI: dwc: ep: Introduce dw_pcie_ep_cleanup() API for drivers supporting PERST#

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Date: Thu, 14 Mar 2024 13:18:03 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Jingoo Han <jingoohan1@...il.com>, 
 Gustavo Pimentel <gustavo.pimentel@...opsys.com>, 
 Lorenzo Pieralisi <lpieralisi@...nel.org>, 
 Krzysztof Wilczyński <kw@...ux.com>, 
 Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>, 
 Marek Vasut <marek.vasut+renesas@...il.com>, 
 Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>, 
 Thierry Reding <thierry.reding@...il.com>, 
 Jonathan Hunter <jonathanh@...dia.com>, 
 Kishon Vijay Abraham I <kishon@...com>, Vidya Sagar <vidyas@...dia.com>, 
 Vignesh Raghavendra <vigneshr@...com>, Richard Zhu <hongxing.zhu@....com>, 
 Lucas Stach <l.stach@...gutronix.de>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>, NXP Linux Team <linux-imx@....com>, 
 Minghuan Lian <minghuan.Lian@....com>, Mingkai Hu <mingkai.hu@....com>, 
 Roy Zang <roy.zang@....com>, 
 Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>, 
 Masami Hiramatsu <mhiramat@...nel.org>, 
 Kishon Vijay Abraham I <kishon@...nel.org>, 
 Jesper Nilsson <jesper.nilsson@...s.com>, 
 Srikanth Thokala <srikanth.thokala@...el.com>
Cc: linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-renesas-soc@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
 linux-tegra@...r.kernel.org, linux-omap@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org, 
 Niklas Cassel <cassel@...nel.org>, linux-arm-kernel@...s.com, 
 Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, 
 Frank Li <Frank.Li@....com>
Subject: [PATCH v10 5/8] PCI: dwc: ep: Introduce dw_pcie_ep_cleanup() API
 for drivers supporting PERST#

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 <cassel@...nel.org>
Closes: https://lore.kernel.org/linux-pci/ZWYmX8Y%2F7Q9WMxES@x1-carbon
Reviewed-by: Frank Li <Frank.Li@....com>
Reviewed-by: Niklas Cassel <cassel@...nel.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---
 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 fa7b26da8718..4c21a38245b6 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -618,6 +618,22 @@ 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
@@ -627,10 +643,9 @@ 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);

-- 
2.25.1