lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

pccard: configure CLS on attach

Browse Source 
For non hotplug PCI devices, the system firmware usually configures
CLS correctly.  For pccard devices system firmware can't do it and
Linux PCI layer doesn't do it either.  Unfortunately this leads to
poor performance for certain devices (sata_sil).  Unless MWI, which
requires separate configuration, is to be used, CLS doesn't affect
correctness, so the configuration should be harmless.

This patch makes pci_set_cacheline_size() always built and export it
and make pccard call it during attach.

Please note that some other PCI hotplug drivers (shpchp and pciehp)
also configure CLS on hotplug.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Daniel Ritz <daniel.ritz@gmx.ch>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: Greg KH <greg@kroah.com>
Cc: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Cc: Axel Birndt <towerlexa@gmx.de>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Tejun Heo
2009-09-22 17:34:48 +09:00
committed by Jesse Barnes
parent 4c0eec7a86
commit 15ea76d407
3 changed files with 36 additions and 28 deletions
Download Patch File Download Diff File Expand all files Collapse all files

40
drivers/pci/pci.c
View File

@@ -1875,23 +1875,6 @@ void pci_clear_master(struct pci_dev *dev)
__pci_set_master(dev, false);
}
#ifdef PCI_DISABLE_MWI
int pci_set_mwi(struct pci_dev *dev)
{
return 0;
}
int pci_try_set_mwi(struct pci_dev *dev)
{
return 0;
}
void pci_clear_mwi(struct pci_dev *dev)
{
}
#else
/**
* pci_set_cacheline_size - ensure the CACHE_LINE_SIZE register is programmed
* @dev: the PCI device for which MWI is to be enabled
@@ -1902,13 +1885,12 @@ void pci_clear_mwi(struct pci_dev *dev)
*
* RETURNS: An appropriate -ERRNO error value on error, or zero for success.
*/
static int
pci_set_cacheline_size(struct pci_dev *dev)
int pci_set_cacheline_size(struct pci_dev *dev)
{
u8 cacheline_size;
if (!pci_cache_line_size)
return -EINVAL; /* The system doesn't support MWI. */
return -EINVAL;
/* Validate current setting: the PCI_CACHE_LINE_SIZE must be
equal to or multiple of the right value. */
@@ -1929,6 +1911,24 @@ pci_set_cacheline_size(struct pci_dev *dev)
return -EINVAL;
}
EXPORT_SYMBOL_GPL(pci_set_cacheline_size);
#ifdef PCI_DISABLE_MWI
int pci_set_mwi(struct pci_dev *dev)
{
return 0;
}
int pci_try_set_mwi(struct pci_dev *dev)
{
return 0;
}
void pci_clear_mwi(struct pci_dev *dev)
{
}
#else
/**
* pci_set_mwi - enables memory-write-invalidate PCI transaction