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authorMatthew Wilcox <matthew@wil.cx>2006-10-10 08:01:19 -0600
committerGreg Kroah-Hartman <gregkh@suse.de>2006-12-01 14:36:56 -0800
commit3efe2d84c8d909567c7976a7106114127b8c3470 (patch)
tree28b93040c032fe5b90bf4fc61fc656eea45832dc /arch/ia64/pci
parent368c73d4f689dae0807d0a2aa74c61fd2b9b075f (diff)
downloadlinux-linaro-3efe2d84c8d909567c7976a7106114127b8c3470.tar.gz
PCI: Use pci_generic_prep_mwi on ia64
The pci_generic_prep_mwi() code does everything that pcibios_prep_mwi() does on ia64. All we need to do is be sure that pci_cache_line_size is set appropriately, and we can delete pcibios_prep_mwi(). Using SMP_CACHE_BYTES as the default was wrong on uniprocessor machines as it is only 8 bytes. The default in the generic code of L1_CACHE_BYTES is at least as good. Signed-off-by: Matthew Wilcox <matthew@wil.cx> Acked-by: Jeff Garzik <jeff@garzik.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch/ia64/pci')
-rw-r--r--arch/ia64/pci/pci.c71
1 files changed, 20 insertions, 51 deletions
diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c
index b30be7c48ba..4f774725346 100644
--- a/arch/ia64/pci/pci.c
+++ b/arch/ia64/pci/pci.c
@@ -738,75 +738,44 @@ int ia64_pci_legacy_write(struct pci_bus *bus, u16 port, u32 val, u8 size)
return ret;
}
+/* It's defined in drivers/pci/pci.c */
+extern u8 pci_cache_line_size;
+
/**
- * pci_cacheline_size - determine cacheline size for PCI devices
- * @dev: void
+ * set_pci_cacheline_size - determine cacheline size for PCI devices
*
* We want to use the line-size of the outer-most cache. We assume
* that this line-size is the same for all CPUs.
*
* Code mostly taken from arch/ia64/kernel/palinfo.c:cache_info().
- *
- * RETURNS: An appropriate -ERRNO error value on eror, or zero for success.
*/
-static unsigned long
-pci_cacheline_size (void)
+static void __init set_pci_cacheline_size(void)
{
u64 levels, unique_caches;
s64 status;
pal_cache_config_info_t cci;
- static u8 cacheline_size;
-
- if (cacheline_size)
- return cacheline_size;
status = ia64_pal_cache_summary(&levels, &unique_caches);
if (status != 0) {
- printk(KERN_ERR "%s: ia64_pal_cache_summary() failed (status=%ld)\n",
- __FUNCTION__, status);
- return SMP_CACHE_BYTES;
+ printk(KERN_ERR "%s: ia64_pal_cache_summary() failed "
+ "(status=%ld)\n", __FUNCTION__, status);
+ return;
}
- status = ia64_pal_cache_config_info(levels - 1, /* cache_type (data_or_unified)= */ 2,
- &cci);
+ status = ia64_pal_cache_config_info(levels - 1,
+ /* cache_type (data_or_unified)= */ 2, &cci);
if (status != 0) {
- printk(KERN_ERR "%s: ia64_pal_cache_config_info() failed (status=%ld)\n",
- __FUNCTION__, status);
- return SMP_CACHE_BYTES;
+ printk(KERN_ERR "%s: ia64_pal_cache_config_info() failed "
+ "(status=%ld)\n", __FUNCTION__, status);
+ return;
}
- cacheline_size = 1 << cci.pcci_line_size;
- return cacheline_size;
+ pci_cache_line_size = (1 << cci.pcci_line_size) / 4;
}
-/**
- * pcibios_prep_mwi - helper function for drivers/pci/pci.c:pci_set_mwi()
- * @dev: the PCI device for which MWI is enabled
- *
- * For ia64, we can get the cacheline sizes from PAL.
- *
- * RETURNS: An appropriate -ERRNO error value on eror, or zero for success.
- */
-int
-pcibios_prep_mwi (struct pci_dev *dev)
-{
- unsigned long desired_linesize, current_linesize;
- int rc = 0;
- u8 pci_linesize;
-
- desired_linesize = pci_cacheline_size();
-
- pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &pci_linesize);
- current_linesize = 4 * pci_linesize;
- if (desired_linesize != current_linesize) {
- printk(KERN_WARNING "PCI: slot %s has incorrect PCI cache line size of %lu bytes,",
- pci_name(dev), current_linesize);
- if (current_linesize > desired_linesize) {
- printk(" expected %lu bytes instead\n", desired_linesize);
- rc = -EINVAL;
- } else {
- printk(" correcting to %lu\n", desired_linesize);
- pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, desired_linesize / 4);
- }
- }
- return rc;
+static int __init pcibios_init(void)
+{
+ set_pci_cacheline_size();
+ return 0;
}
+
+subsys_initcall(pcibios_init);