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authorAlex Williamson <alex.williamson@hp.com>2005-09-06 13:20:49 -0400
committerTony Luck <tony.luck@intel.com>2005-09-14 19:22:11 -0400
commit0b9afede3d9c66fef06f1d5ef5ff15c4b97730fc (patch)
tree95f55e1219eed9c3fd2458ddbf960307c631114e /arch/ia64/hp
parent1619cca2921f6927f4240e03f413d4165c7002fc (diff)
[IA64] more robust zx1/sx1000 machvec support
Machine vector selection has always been a bit of a hack given how early in system boot it needs to be done. Services like ACPI namespace are not available and there are non-trivial problems to moving them to early boot. However, there's no reason we can't change to a different machvec later in boot when the services we need are available. By adding a entry point for later initialization of the swiotlb, we can add an error path for the hpzx1 machevec initialization and fall back to the DIG machine vector if IOMMU hardware isn't found in the system. Since ia64 uses 4GB for zone DMA (no ISA support), it's trivial to allocate a contiguous range from the slab for bounce buffer usage. Signed-off-by: Alex Williamson <alex.williamson@hp.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/hp')
-rw-r--r--arch/ia64/hp/common/hwsw_iommu.c13
-rw-r--r--arch/ia64/hp/common/sba_iommu.c45
2 files changed, 43 insertions, 15 deletions
diff --git a/arch/ia64/hp/common/hwsw_iommu.c b/arch/ia64/hp/common/hwsw_iommu.c
index 80f8ef013939..317c334c5a18 100644
--- a/arch/ia64/hp/common/hwsw_iommu.c
+++ b/arch/ia64/hp/common/hwsw_iommu.c
@@ -17,7 +17,7 @@
17#include <asm/machvec.h> 17#include <asm/machvec.h>
18 18
19/* swiotlb declarations & definitions: */ 19/* swiotlb declarations & definitions: */
20extern void swiotlb_init_with_default_size (size_t size); 20extern int swiotlb_late_init_with_default_size (size_t size);
21extern ia64_mv_dma_alloc_coherent swiotlb_alloc_coherent; 21extern ia64_mv_dma_alloc_coherent swiotlb_alloc_coherent;
22extern ia64_mv_dma_free_coherent swiotlb_free_coherent; 22extern ia64_mv_dma_free_coherent swiotlb_free_coherent;
23extern ia64_mv_dma_map_single swiotlb_map_single; 23extern ia64_mv_dma_map_single swiotlb_map_single;
@@ -67,7 +67,16 @@ void
67hwsw_init (void) 67hwsw_init (void)
68{ 68{
69 /* default to a smallish 2MB sw I/O TLB */ 69 /* default to a smallish 2MB sw I/O TLB */
70 swiotlb_init_with_default_size (2 * (1<<20)); 70 if (swiotlb_late_init_with_default_size (2 * (1<<20)) != 0) {
71#ifdef CONFIG_IA64_GENERIC
72 /* Better to have normal DMA than panic */
73 printk(KERN_WARNING "%s: Failed to initialize software I/O TLB,"
74 " reverting to hpzx1 platform vector\n", __FUNCTION__);
75 machvec_init("hpzx1");
76#else
77 panic("Unable to initialize software I/O TLB services");
78#endif
79 }
71} 80}
72 81
73void * 82void *
diff --git a/arch/ia64/hp/common/sba_iommu.c b/arch/ia64/hp/common/sba_iommu.c
index 11957598a8b9..e64ca04ace89 100644
--- a/arch/ia64/hp/common/sba_iommu.c
+++ b/arch/ia64/hp/common/sba_iommu.c
@@ -2028,9 +2028,40 @@ static struct acpi_driver acpi_sba_ioc_driver = {
2028static int __init 2028static int __init
2029sba_init(void) 2029sba_init(void)
2030{ 2030{
2031 if (!ia64_platform_is("hpzx1") && !ia64_platform_is("hpzx1_swiotlb"))
2032 return 0;
2033
2031 acpi_bus_register_driver(&acpi_sba_ioc_driver); 2034 acpi_bus_register_driver(&acpi_sba_ioc_driver);
2032 if (!ioc_list) 2035 if (!ioc_list) {
2036#ifdef CONFIG_IA64_GENERIC
2037 extern int swiotlb_late_init_with_default_size (size_t size);
2038
2039 /*
2040 * If we didn't find something sba_iommu can claim, we
2041 * need to setup the swiotlb and switch to the dig machvec.
2042 */
2043 if (swiotlb_late_init_with_default_size(64 * (1<<20)) != 0)
2044 panic("Unable to find SBA IOMMU or initialize "
2045 "software I/O TLB: Try machvec=dig boot option");
2046 machvec_init("dig");
2047#else
2048 panic("Unable to find SBA IOMMU: Try a generic or DIG kernel");
2049#endif
2033 return 0; 2050 return 0;
2051 }
2052
2053#if defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_HP_ZX1_SWIOTLB)
2054 /*
2055 * hpzx1_swiotlb needs to have a fairly small swiotlb bounce
2056 * buffer setup to support devices with smaller DMA masks than
2057 * sba_iommu can handle.
2058 */
2059 if (ia64_platform_is("hpzx1_swiotlb")) {
2060 extern void hwsw_init(void);
2061
2062 hwsw_init();
2063 }
2064#endif
2034 2065
2035#ifdef CONFIG_PCI 2066#ifdef CONFIG_PCI
2036 { 2067 {
@@ -2048,18 +2079,6 @@ sba_init(void)
2048 2079
2049subsys_initcall(sba_init); /* must be initialized after ACPI etc., but before any drivers... */ 2080subsys_initcall(sba_init); /* must be initialized after ACPI etc., but before any drivers... */
2050 2081
2051extern void dig_setup(char**);
2052/*
2053 * MAX_DMA_ADDRESS needs to be setup prior to paging_init to do any good,
2054 * so we use the platform_setup hook to fix it up.
2055 */
2056void __init
2057sba_setup(char **cmdline_p)
2058{
2059 MAX_DMA_ADDRESS = ~0UL;
2060 dig_setup(cmdline_p);
2061}
2062
2063static int __init 2082static int __init
2064nosbagart(char *str) 2083nosbagart(char *str)
2065{ 2084{