linux-kernel - [PATCH 7/7] PCI: aardvark: Fix setting MSI address

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Message-Id: <20210625090319.10220-8-pali@kernel.org>
Date:   Fri, 25 Jun 2021 11:03:19 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh@...nel.org>
Cc:     Marek Behún <kabel@...nel.org>,
        Marc Zyngier <maz@...nel.org>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 7/7] PCI: aardvark: Fix setting MSI address

MSI address for receiving MSI interrupts needs to be correctly set before
enabling processing of MSI interrupts.

Move code for setting PCIE_MSI_ADDR_LOW_REG and PCIE_MSI_ADDR_HIGH_REG
registers with MSI address from advk_pcie_init_msi_irq_domain() function to
advk_pcie_setup_hw() function before enabling PCIE_CORE_CTRL2_MSI_ENABLE.

As part of this change, also remove unused variable msi_msg, which was used
only for MSI doorbell address. MSI address can be any address which cannot
be used to DMA to. So change it to the address of the main struct advk_pcie

Signed-off-by: Pali Rohár <pali@...nel.org>
Reviewed-by: Marek Behún <kabel@...nel.org>
Acked-by: Marc Zyngier <maz@...nel.org>
Cc: stable@...r.kernel.org # f21a8b1b6837 ("PCI: aardvark: Move to MSI handling using generic MSI support")
---
 drivers/pci/controller/pci-aardvark.c | 21 +++++++++------------
 1 file changed, 9 insertions(+), 12 deletions(-)

diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c
index 7cad6d989f6c..84ecc418e6be 100644
--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -244,7 +244,6 @@ struct advk_pcie {
 	struct msi_domain_info msi_domain_info;
 	DECLARE_BITMAP(msi_used, MSI_IRQ_NUM);
 	struct mutex msi_used_lock;
-	u16 msi_msg;
 	int link_gen;
 	struct pci_bridge_emul bridge;
 	struct gpio_desc *reset_gpio;
@@ -403,6 +402,7 @@ static void advk_pcie_disable_ob_win(struct advk_pcie *pcie, u8 win_num)
 
 static void advk_pcie_setup_hw(struct advk_pcie *pcie)
 {
+	phys_addr_t msi_addr;
 	u32 reg;
 	int i;
 
@@ -465,6 +465,11 @@ static void advk_pcie_setup_hw(struct advk_pcie *pcie)
 	reg |= LANE_COUNT_1;
 	advk_writel(pcie, reg, PCIE_CORE_CTRL0_REG);
 
+	/* Set MSI address */
+	msi_addr = virt_to_phys(pcie);
+	advk_writel(pcie, lower_32_bits(msi_addr), PCIE_MSI_ADDR_LOW_REG);
+	advk_writel(pcie, upper_32_bits(msi_addr), PCIE_MSI_ADDR_HIGH_REG);
+
 	/* Enable MSI */
 	reg = advk_readl(pcie, PCIE_CORE_CTRL2_REG);
 	reg |= PCIE_CORE_CTRL2_MSI_ENABLE;
@@ -982,10 +987,10 @@ static void advk_msi_irq_compose_msi_msg(struct irq_data *data,
 					 struct msi_msg *msg)
 {
 	struct advk_pcie *pcie = irq_data_get_irq_chip_data(data);
-	phys_addr_t msi_msg = virt_to_phys(&pcie->msi_msg);
+	phys_addr_t msi_addr = virt_to_phys(pcie);
 
-	msg->address_lo = lower_32_bits(msi_msg);
-	msg->address_hi = upper_32_bits(msi_msg);
+	msg->address_lo = lower_32_bits(msi_addr);
+	msg->address_hi = upper_32_bits(msi_addr);
 	msg->data = data->hwirq;
 }
 
@@ -1080,7 +1085,6 @@ static int advk_pcie_init_msi_irq_domain(struct advk_pcie *pcie)
 	struct device_node *node = dev->of_node;
 	struct irq_chip *bottom_ic, *msi_ic;
 	struct msi_domain_info *msi_di;
-	phys_addr_t msi_msg_phys;
 
 	mutex_init(&pcie->msi_used_lock);
 
@@ -1098,13 +1102,6 @@ static int advk_pcie_init_msi_irq_domain(struct advk_pcie *pcie)
 		MSI_FLAG_MULTI_PCI_MSI;
 	msi_di->chip = msi_ic;
 
-	msi_msg_phys = virt_to_phys(&pcie->msi_msg);
-
-	advk_writel(pcie, lower_32_bits(msi_msg_phys),
-		    PCIE_MSI_ADDR_LOW_REG);
-	advk_writel(pcie, upper_32_bits(msi_msg_phys),
-		    PCIE_MSI_ADDR_HIGH_REG);
-
 	pcie->msi_inner_domain =
 		irq_domain_add_linear(NULL, MSI_IRQ_NUM,
 				      &advk_msi_domain_ops, pcie);
-- 
2.20.1