diff options
author | Pali Rohár <pali@kernel.org> | 2022-01-10 02:49:57 +0100 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-05-12 12:20:26 +0200 |
commit | 8dfd365c37f5fda783a77cb857b47c8e4204e104 (patch) | |
tree | 537ac782a66e3ac2beb6d39237778062ee10fd29 | |
parent | 119016ee90fe87857be5487a80e8b04c8698b311 (diff) |
PCI: aardvark: Fix reading MSI interrupt number
commit 805dfc18dd3d4dd97a987d4406593b5a225b1253 upstream.
In advk_pcie_handle_msi() it is expected that when bit i in the W1C
register PCIE_MSI_STATUS_REG is cleared, the PCIE_MSI_PAYLOAD_REG is
updated to contain the MSI number corresponding to index i.
Experiments show that this is not so, and instead PCIE_MSI_PAYLOAD_REG
always contains the number of the last received MSI, overall.
Do not read PCIE_MSI_PAYLOAD_REG register for determining MSI interrupt
number. Since Aardvark already forbids more than 32 interrupts and uses
own allocated hwirq numbers, the msi_idx already corresponds to the
received MSI number.
Link: https://lore.kernel.org/r/20220110015018.26359-3-kabel@kernel.org
Fixes: 8c39d710363c ("PCI: aardvark: Add Aardvark PCI host controller driver")
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Marek Behún <kabel@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Marek Behún <kabel@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r-- | drivers/pci/controller/pci-aardvark.c | 10 |
1 files changed, 3 insertions, 7 deletions
diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c index ae5abd233df4..a5bc529e9e82 100644 --- a/drivers/pci/controller/pci-aardvark.c +++ b/drivers/pci/controller/pci-aardvark.c @@ -1035,7 +1035,7 @@ static void advk_pcie_remove_irq_domain(struct advk_pcie *pcie) static void advk_pcie_handle_msi(struct advk_pcie *pcie) { u32 msi_val, msi_mask, msi_status, msi_idx; - u16 msi_data; + int virq; msi_mask = advk_readl(pcie, PCIE_MSI_MASK_REG); msi_val = advk_readl(pcie, PCIE_MSI_STATUS_REG); @@ -1045,13 +1045,9 @@ static void advk_pcie_handle_msi(struct advk_pcie *pcie) if (!(BIT(msi_idx) & msi_status)) continue; - /* - * msi_idx contains bits [4:0] of the msi_data and msi_data - * contains 16bit MSI interrupt number - */ advk_writel(pcie, BIT(msi_idx), PCIE_MSI_STATUS_REG); - msi_data = advk_readl(pcie, PCIE_MSI_PAYLOAD_REG) & PCIE_MSI_DATA_MASK; - generic_handle_irq(msi_data); + virq = irq_find_mapping(pcie->msi_inner_domain, msi_idx); + generic_handle_irq(virq); } advk_writel(pcie, PCIE_ISR0_MSI_INT_PENDING, |