diff options
Diffstat (limited to 'arch/ia64')
-rw-r--r-- | arch/ia64/pci/pci.c | 71 |
1 files changed, 20 insertions, 51 deletions
diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c index b30be7c48ba8..4f7747253467 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) | |||
738 | return ret; | 738 | return ret; |
739 | } | 739 | } |
740 | 740 | ||
741 | /* It's defined in drivers/pci/pci.c */ | ||
742 | extern u8 pci_cache_line_size; | ||
743 | |||
741 | /** | 744 | /** |
742 | * pci_cacheline_size - determine cacheline size for PCI devices | 745 | * set_pci_cacheline_size - determine cacheline size for PCI devices |
743 | * @dev: void | ||
744 | * | 746 | * |
745 | * We want to use the line-size of the outer-most cache. We assume | 747 | * We want to use the line-size of the outer-most cache. We assume |
746 | * that this line-size is the same for all CPUs. | 748 | * that this line-size is the same for all CPUs. |
747 | * | 749 | * |
748 | * Code mostly taken from arch/ia64/kernel/palinfo.c:cache_info(). | 750 | * Code mostly taken from arch/ia64/kernel/palinfo.c:cache_info(). |
749 | * | ||
750 | * RETURNS: An appropriate -ERRNO error value on eror, or zero for success. | ||
751 | */ | 751 | */ |
752 | static unsigned long | 752 | static void __init set_pci_cacheline_size(void) |
753 | pci_cacheline_size (void) | ||
754 | { | 753 | { |
755 | u64 levels, unique_caches; | 754 | u64 levels, unique_caches; |
756 | s64 status; | 755 | s64 status; |
757 | pal_cache_config_info_t cci; | 756 | pal_cache_config_info_t cci; |
758 | static u8 cacheline_size; | ||
759 | |||
760 | if (cacheline_size) | ||
761 | return cacheline_size; | ||
762 | 757 | ||
763 | status = ia64_pal_cache_summary(&levels, &unique_caches); | 758 | status = ia64_pal_cache_summary(&levels, &unique_caches); |
764 | if (status != 0) { | 759 | if (status != 0) { |
765 | printk(KERN_ERR "%s: ia64_pal_cache_summary() failed (status=%ld)\n", | 760 | printk(KERN_ERR "%s: ia64_pal_cache_summary() failed " |
766 | __FUNCTION__, status); | 761 | "(status=%ld)\n", __FUNCTION__, status); |
767 | return SMP_CACHE_BYTES; | 762 | return; |
768 | } | 763 | } |
769 | 764 | ||
770 | status = ia64_pal_cache_config_info(levels - 1, /* cache_type (data_or_unified)= */ 2, | 765 | status = ia64_pal_cache_config_info(levels - 1, |
771 | &cci); | 766 | /* cache_type (data_or_unified)= */ 2, &cci); |
772 | if (status != 0) { | 767 | if (status != 0) { |
773 | printk(KERN_ERR "%s: ia64_pal_cache_config_info() failed (status=%ld)\n", | 768 | printk(KERN_ERR "%s: ia64_pal_cache_config_info() failed " |
774 | __FUNCTION__, status); | 769 | "(status=%ld)\n", __FUNCTION__, status); |
775 | return SMP_CACHE_BYTES; | 770 | return; |
776 | } | 771 | } |
777 | cacheline_size = 1 << cci.pcci_line_size; | 772 | pci_cache_line_size = (1 << cci.pcci_line_size) / 4; |
778 | return cacheline_size; | ||
779 | } | 773 | } |
780 | 774 | ||
781 | /** | 775 | static int __init pcibios_init(void) |
782 | * pcibios_prep_mwi - helper function for drivers/pci/pci.c:pci_set_mwi() | 776 | { |
783 | * @dev: the PCI device for which MWI is enabled | 777 | set_pci_cacheline_size(); |
784 | * | 778 | return 0; |
785 | * For ia64, we can get the cacheline sizes from PAL. | ||
786 | * | ||
787 | * RETURNS: An appropriate -ERRNO error value on eror, or zero for success. | ||
788 | */ | ||
789 | int | ||
790 | pcibios_prep_mwi (struct pci_dev *dev) | ||
791 | { | ||
792 | unsigned long desired_linesize, current_linesize; | ||
793 | int rc = 0; | ||
794 | u8 pci_linesize; | ||
795 | |||
796 | desired_linesize = pci_cacheline_size(); | ||
797 | |||
798 | pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, &pci_linesize); | ||
799 | current_linesize = 4 * pci_linesize; | ||
800 | if (desired_linesize != current_linesize) { | ||
801 | printk(KERN_WARNING "PCI: slot %s has incorrect PCI cache line size of %lu bytes,", | ||
802 | pci_name(dev), current_linesize); | ||
803 | if (current_linesize > desired_linesize) { | ||
804 | printk(" expected %lu bytes instead\n", desired_linesize); | ||
805 | rc = -EINVAL; | ||
806 | } else { | ||
807 | printk(" correcting to %lu\n", desired_linesize); | ||
808 | pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, desired_linesize / 4); | ||
809 | } | ||
810 | } | ||
811 | return rc; | ||
812 | } | 779 | } |
780 | |||
781 | subsys_initcall(pcibios_init); | ||