On 05/27/2015 05:43 PM, Arnd Bergmann wrote:
On Wednesday 27 May 2015 17:31:46 Arnd Bergmann wrote:
Yes, that works. However there are two problems with the approach:
- we have to change all PCI host drivers on ARM to do this in order to remove
the ARM-specific pcibios_msi_controller() function
- it's possible that there are dw_pcie implementations that do not include
an MSI controller, so that pointer would be NULL, which leads to the
core code to still call the ARM-specific pcibios_msi_controller() function
unless we remove it.
I wonder if this simple patch would be sufficient to kill off
pcibios_msi_controller().
Can one of you try it?
Arnd
Hi Arnd,
I tested it quickly on my platform, with and without CONFIG_PCI_MSI.
In both case it seems to run fine with dw pcie.
diff --git a/arch/arm/kernel/bios32.c b/arch/arm/kernel/bios32.c
index fcbbbb1b9e95..7afb6d253162 100644
--- a/arch/arm/kernel/bios32.c
+++ b/arch/arm/kernel/bios32.c
@@ -18,15 +18,6 @@
static int debug_pci;
-#ifdef CONFIG_PCI_MSI
-struct msi_controller *pcibios_msi_controller(struct pci_dev *dev)
-{
- struct pci_sys_data *sysdata = dev->bus->sysdata;
-
- return sysdata->msi_ctrl;
-}
-#endif
-
/*
* We can't use pci_get_device() here since we are
* called from interrupt context.
@@ -462,9 +453,6 @@ static void pcibios_init_hw(struct device *parent, struct hw_pci *hw,
if (!sys)
panic("PCI: unable to allocate sys data!");
-#ifdef CONFIG_PCI_MSI
- sys->msi_ctrl = hw->msi_ctrl;
-#endif
sys->busnr = busnr;
sys->swizzle = hw->swizzle;
sys->map_irq = hw->map_irq;
@@ -493,6 +481,9 @@ static void pcibios_init_hw(struct device *parent, struct hw_pci *hw,
panic("PCI: unable to scan bus!");
busnr = sys->bus->busn_res.end + 1;
+#ifdef CONFIG_PCI_MSI
+ bus->msi = hw->msi_ctrl;
(with small adaptation here: s/bus->msi/sys->bus->msi)
BR,
Fabrice
+#endif
list_add(&sys->node, head);
} else {
--
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