On Wednesday 27 May 2015 18:19:57 Fabrice Gasnier wrote:
> 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.
>
Awesome. Now we just need to find a way to move the align_resource callback.
I wonder if the approach below would be acceptable.
Arnd
diff --git a/arch/arm/kernel/bios32.c b/arch/arm/kernel/bios32.c
index fcbbbb1b9e95..20839d26a490 100644
--- a/arch/arm/kernel/bios32.c
+++ b/arch/arm/kernel/bios32.c
@@ -597,9 +588,6 @@ resource_size_t pcibios_align_resource(void *data, const
struct resource *res,
start = (start + align - 1) & ~(align - 1);
- if (sys->align_resource)
- return sys->align_resource(dev, res, start, size, align);
-
return start;
}
diff --git a/drivers/pci/host/pci-mvebu.c b/drivers/pci/host/pci-mvebu.c
index 1ab863551920..74216c9c2822 100644
--- a/drivers/pci/host/pci-mvebu.c
+++ b/drivers/pci/host/pci-mvebu.c
@@ -751,27 +751,20 @@ static int mvebu_pcie_setup(int nr, struct pci_sys_data
*sys)
return 1;
}
-static struct pci_bus *mvebu_pcie_scan_bus(int nr, struct pci_sys_data *sys)
+static resource_size_t mvebu_pcie_align_resource(void *data,
+ const struct resource *res,
+ resource_size_t size,
+ resource_size_t align)
{
- struct mvebu_pcie *pcie = sys_to_pcie(sys);
- struct pci_bus *bus;
+ struct device *dev = data;
- bus = pci_create_root_bus(&pcie->pdev->dev, sys->busnr,
- &mvebu_pcie_ops, sys, &sys->resources);
- if (!bus)
- return NULL;
+ resource_size_t start = res->start;
- pci_scan_child_bus(bus);
+ if (res->flags & IORESOURCE_IO && start & 0x300)
+ start = (start + 0x3ff) & ~0x3ff;
- return bus;
-}
+ start = (start + align - 1) & ~(align - 1);
-static resource_size_t mvebu_pcie_align_resource(struct pci_dev *dev,
- const struct resource *res,
- resource_size_t start,
- resource_size_t size,
- resource_size_t align)
-{
if (dev->bus->number != 0)
return start;
@@ -796,6 +789,25 @@ static resource_size_t mvebu_pcie_align_resource(struct
pci_dev *dev,
return start;
}
+static struct pci_bus *mvebu_pcie_scan_bus(int nr, struct pci_sys_data *sys)
+{
+ struct mvebu_pcie *pcie = sys_to_pcie(sys);
+ struct pci_host_bridge *phb;
+ struct pci_bus *bus;
+
+ bus = pci_create_root_bus(&pcie->pdev->dev, sys->busnr,
+ &mvebu_pcie_ops, sys, &sys->resources);
+ if (!bus)
+ return NULL;
+
+ phb = pci_find_host_bridge(bus);
+ phb->align_resource = mvebu_pcie_align_resource;
+
+ pci_scan_child_bus(bus);
+
+ return bus;
+}
+
static void mvebu_pcie_enable(struct mvebu_pcie *pcie)
{
struct hw_pci hw;
@@ -812,7 +824,6 @@ static void mvebu_pcie_enable(struct mvebu_pcie *pcie)
hw.scan = mvebu_pcie_scan_bus;
hw.map_irq = of_irq_parse_and_map_pci;
hw.ops = &mvebu_pcie_ops;
- hw.align_resource = mvebu_pcie_align_resource;
pci_common_init(&hw);
}
diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
index 232f9254c11a..e1f5e13c4636 100644
--- a/drivers/pci/setup-res.c
+++ b/drivers/pci/setup-res.c
@@ -200,7 +200,11 @@ static int pci_revert_fw_address(struct resource *res,
struct pci_dev *dev,
}
static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev,
- int resno, resource_size_t size, resource_size_t align)
+ int resno, resource_size_t size, resource_size_t align,
+ resource_size_t (*alignf)(void *,
+ const struct resource *,
+ resource_size_t,
+ resource_size_t))
{
struct resource *res = dev->resource + resno;
resource_size_t min;
@@ -217,7 +221,7 @@ static int __pci_assign_resource(struct pci_bus *bus,
struct pci_dev *dev,
*/
ret = pci_bus_alloc_resource(bus, res, size, align, min,
IORESOURCE_PREFETCH | IORESOURCE_MEM_64,
- pcibios_align_resource, dev);
+ alignf, dev);
if (ret == 0)
return 0;
@@ -229,7 +233,7 @@ static int __pci_assign_resource(struct pci_bus *bus,
struct pci_dev *dev,
(IORESOURCE_PREFETCH | IORESOURCE_MEM_64)) {
ret = pci_bus_alloc_resource(bus, res, size, align, min,
IORESOURCE_PREFETCH,
- pcibios_align_resource, dev);
+ alignf, dev);
if (ret == 0)
return 0;
}
@@ -242,7 +246,7 @@ static int __pci_assign_resource(struct pci_bus *bus,
struct pci_dev *dev,
*/
if (res->flags & (IORESOURCE_PREFETCH | IORESOURCE_MEM_64))
ret = pci_bus_alloc_resource(bus, res, size, align, min, 0,
- pcibios_align_resource, dev);
+ alignf, dev);
return ret;
}
@@ -251,10 +255,19 @@ static int _pci_assign_resource(struct pci_dev *dev, int
resno,
resource_size_t size, resource_size_t min_align)
{
struct pci_bus *bus;
+ struct pci_host_bridge *phb;
int ret;
bus = dev->bus;
- while ((ret = __pci_assign_resource(bus, dev, resno, size, min_align)))
{
+ phb = pci_find_host_bridge(bus);
+
+ if (phb->align_resource)
+ alignf = phb->align_resource;
+ else
+ alignf = pcibios_align_resource;
+
+ while ((ret = __pci_assign_resource(bus, dev, resno, size,
+ min_align, alignf))) {
if (!bus->parent || !bus->self->transparent)
break;
bus = bus->parent;
--
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