This is a note to let you know that I've just added the patch titled
Subject: PCI: Add pci_enable_device_{io,mem} intefaces
to my gregkh-2.6 tree. Its filename is
pci-add-pci_enable_device_-io-mem-intefaces.patch
This tree can be found at
http://www.kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/patches/
>From [email protected] Wed Dec 19 20:30:44 2007
From: Benjamin Herrenschmidt <[email protected]>
Date: Thu, 20 Dec 2007 15:28:08 +1100
Subject: PCI: Add pci_enable_device_{io,mem} intefaces
To: Greg Kroah-Hartman <[email protected]>
Cc: [email protected], <[email protected]>, <[email protected]>, Alan Cox <[email protected]>, <[email protected]>, <[email protected]>, Bartlomiej Zolnierkiewicz <[email protected]>
Message-ID: <[email protected]>
The pci_enable_device_bars() interface isn't well suited to PCI
because you can't actually enable/disable BARs individually on
a device. So for example, if a device has 2 memory BARs 0 and 1,
and one of them (let's say 1) has not been successfully allocated
by the firmware or the kernel, then enabling memory decoding
shouldn't be permitted for the entire device since it will decode
whatever random address is still in that BAR 1.
So a device must be either fully enabled for IO, for Memory, or
for both. Not on a per-BAR basis.
This provides two new functions, pci_enable_device_io() and
pci_enable_device_mem() to replace pci_enable_device_bars(). The
implementation internally builds a BAR mask in order to be able
to use existing arch infrastructure.
Signed-off-by: Benjamin Herrenschmidt <[email protected]>
Acked-by: Ivan Kokshaysky <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/pci/pci.c | 49 ++++++++++++++++++++++++++++++++++++++++++++++++-
include/linux/pci.h | 2 ++
2 files changed, 50 insertions(+), 1 deletion(-)
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -764,6 +764,51 @@ pci_enable_device_bars(struct pci_dev *d
return err;
}
+static int __pci_enable_device_flags(struct pci_dev *dev,
+ resource_size_t flags)
+{
+ int err;
+ int i, bars = 0;
+
+ if (atomic_add_return(1, &dev->enable_cnt) > 1)
+ return 0; /* already enabled */
+
+ for (i = 0; i < DEVICE_COUNT_RESOURCE; i++)
+ if (dev->resource[i].flags & flags)
+ bars |= (1 << i);
+
+ err = do_pci_enable_device(dev, bars);
+ if (err < 0)
+ atomic_dec(&dev->enable_cnt);
+ return err;
+}
+
+/**
+ * pci_enable_device_io - Initialize a device for use with IO space
+ * @dev: PCI device to be initialized
+ *
+ * Initialize device before it's used by a driver. Ask low-level code
+ * to enable I/O resources. Wake up the device if it was suspended.
+ * Beware, this function can fail.
+ */
+int pci_enable_device_io(struct pci_dev *dev)
+{
+ return __pci_enable_device_flags(dev, IORESOURCE_IO);
+}
+
+/**
+ * pci_enable_device_mem - Initialize a device for use with Memory space
+ * @dev: PCI device to be initialized
+ *
+ * Initialize device before it's used by a driver. Ask low-level code
+ * to enable Memory resources. Wake up the device if it was suspended.
+ * Beware, this function can fail.
+ */
+int pci_enable_device_mem(struct pci_dev *dev)
+{
+ return __pci_enable_device_flags(dev, IORESOURCE_MEM);
+}
+
/**
* pci_enable_device - Initialize device before it's used by a driver.
* @dev: PCI device to be initialized
@@ -777,7 +822,7 @@ pci_enable_device_bars(struct pci_dev *d
*/
int pci_enable_device(struct pci_dev *dev)
{
- return pci_enable_device_bars(dev, (1 << PCI_NUM_RESOURCES) - 1);
+ return __pci_enable_device_flags(dev, IORESOURCE_MEM | IORESOURCE_IO);
}
/*
@@ -1651,6 +1696,8 @@ device_initcall(pci_init);
EXPORT_SYMBOL(pci_reenable_device);
EXPORT_SYMBOL(pci_enable_device_bars);
+EXPORT_SYMBOL(pci_enable_device_io);
+EXPORT_SYMBOL(pci_enable_device_mem);
EXPORT_SYMBOL(pci_enable_device);
EXPORT_SYMBOL(pcim_enable_device);
EXPORT_SYMBOL(pcim_pin_device);
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -544,6 +544,8 @@ static inline int pci_write_config_dword
int __must_check pci_enable_device(struct pci_dev *dev);
int __must_check pci_enable_device_bars(struct pci_dev *dev, int mask);
+int __must_check pci_enable_device_io(struct pci_dev *dev);
+int __must_check pci_enable_device_mem(struct pci_dev *dev);
int __must_check pci_reenable_device(struct pci_dev *);
int __must_check pcim_enable_device(struct pci_dev *pdev);
void pcim_pin_device(struct pci_dev *pdev);
Patches currently in gregkh-2.6 which might be from [email protected] are
bad/battery-class-driver.patch
driver/adb-convert-from-class_device-to-device.patch
driver/kobject-convert-hvc_console-to-use-kref-not-kobject.patch
driver/kobject-convert-hvcs-to-use-kref-not-kobject.patch
driver/kobject-convert-icom-to-use-kref-not-kobject.patch
pci/pci-fix-bus-resource-assignment-on-32-bits-with-64b-resources.patch
pci/pci-fix-warning-in-setup-res.c-on-32-bit-platforms-with-64-bit-resources.patch
pci/pci-add-pci_enable_device_-io-mem-intefaces.patch
pci/pci-remove-pci_enable_device_bars.patch
pci/pci-remove-users-of-pci_enable_device_bars.patch
usb/usb-remove-ohci-useless-masking-unmasking-of-wdh-interrupt.patch
--
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