On Thursday 28 May 2015 19:48:37 Zhou Wang wrote:
>
> I think this code is fine, and we also should add a funtion point in struct pci_host_bridge to
> store mvebu_pcie_align_resource. How about I make a new version patchset with above codes for
> further reviewing ?
>
Yes, that would be nice. I've run into a few build errors with the first version,
see below for a version that actually builds. You can base on top of that.
We also need to do something about pci_find_host_bridge() here, possibly just
storing a pointer to the host bridge in pci_bus to avoid the function call.
A few of the other members in pci_bus (ops, msi, sysdata, domain_nr, and
maybe more) could eventually be moved into pci_host_bridge as well, but
that requires changing all code accessing those fields of course.
Arnd
commit 8140432e10b7cd59ec6246c2b7268abfccdeaaae
Author: Arnd Bergmann <arnd@xxxxxxxx>
Date: Thu May 28 12:21:27 2015 +0200
[HACK] try to get rid of pci_sys_data dependency in bios32
This is an experimental patch to remove the last two dependencies
we have.
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
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
@@ -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
+ sys->bus->msi = hw->msi_ctrl;
+#endif
list_add(&sys->node, head);
} else {
@@ -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..155d05fc11b9 100644
--- a/drivers/pci/host/pci-mvebu.c
+++ b/drivers/pci/host/pci-mvebu.c
@@ -22,6 +22,8 @@
#include <linux/of_pci.h>
#include <linux/of_platform.h>
+#include "../pci.h" /* HACK to see pci_find_host_bridge */
+
/*
* PCIe unit register offsets.
*/
@@ -751,27 +753,20 @@ 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 pci_dev *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 +791,25 @@ 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 +826,6 @@ 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..73abca7ccc7a 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 +255,23 @@ 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;
+ resource_size_t (*alignf)(void *,
+ const struct resource *,
+ resource_size_t,
+ resource_size_t);
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;
diff --git a/include/linux/pci.h b/include/linux/pci.h
index bc50bb05f0ab..3aad084f12ad 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -404,6 +404,9 @@ struct pci_host_bridge {
struct device dev;
struct pci_bus *bus; /* root bus */
struct list_head windows; /* resource_entry */
+ resource_size_t (*align_resource)(void *data,
+ const struct resource *res,
+ resource_size_t size, resource_size_t align);
void (*release_fn)(struct pci_host_bridge *);
void *release_data;
unsigned int ignore_reset_delay:1; /* for entire hierarchy */
--
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