linux-kernel - [RFC PATCH 2/3] PCI: dwc: support align_mem() callback for pci_epc

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Date:   Fri, 13 Jan 2023 18:03:49 +0900
From:   Shunsuke Mie <mie@...l.co.jp>
To:     Jingoo Han <jingoohan1@...il.com>
Cc:     Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Shunsuke Mie <mie@...l.co.jp>,
        Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>,
        Hou Zhiqiang <Zhiqiang.Hou@....com>,
        Frank Li <Frank.Li@....com>, Li Chen <lchen@...arella.com>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH 2/3] PCI: dwc: support align_mem() callback for pci_epc_epc

DWC PCIe EPC driver has alignment restriction for mapping as
pci->region_align. Use it to align memory.

Signed-off-by: Shunsuke Mie <mie@...l.co.jp>
---
 drivers/pci/controller/dwc/pcie-designware-ep.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
index d06654895eba..7a7d7513b612 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -444,6 +444,18 @@ static void dw_pcie_ep_stop(struct pci_epc *epc)
 	dw_pcie_stop_link(pci);
 }
 
+static u64 dw_pcie_ep_align_mem(struct pci_epc *epc, u64 addr, size_t *size)
+{
+	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
+	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
+	u64 aaddr;
+
+	aaddr = ALIGN_DOWN(addr, pci->region_align);
+	*size += addr - aaddr;
+
+	return aaddr;
+}
+
 static int dw_pcie_ep_start(struct pci_epc *epc)
 {
 	struct dw_pcie_ep *ep = epc_get_drvdata(epc);
@@ -474,6 +486,7 @@ static const struct pci_epc_ops epc_ops = {
 	.set_msix		= dw_pcie_ep_set_msix,
 	.get_msix		= dw_pcie_ep_get_msix,
 	.raise_irq		= dw_pcie_ep_raise_irq,
+	.align_mem		= dw_pcie_ep_align_mem,
 	.start			= dw_pcie_ep_start,
 	.stop			= dw_pcie_ep_stop,
 	.get_features		= dw_pcie_ep_get_features,
-- 
2.25.1