set up dma_ops appropriately

This patch introduces a global pointer, dma_ops, which points to an
appropriate dma_mapping_ops that the kernel should use. This is a
common way to handle multiple dma_mapping_ops (X86, POWER, and SPARC).

dma_ops is set in platform_dma_init. We also set it by hand where
machvec_init is callev via subsys_initcall.

- IA64_DIG_VTD uses vtd_dma_ops.
- IA64_HP_ZX1 uses sba_dma_ops.
- IA64_HP_ZX1_SWIOTLB uses hwsw_dma_ops.
- IA64_SGI_SN2 uses sn_dma_ops.
- The rest use swiotlb_dma_ops.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
FUJITA Tomonori 2009-01-05 23:36:12 +09:00 committed by Ingo Molnar
parent c82e4417ac
commit 4d9b977ca6
10 changed files with 38 additions and 7 deletions

View file

@ -56,9 +56,12 @@ use_swiotlb (struct device *dev)
return dev && dev->dma_mask && !hwiommu_dma_supported(dev, *dev->dma_mask);
}
struct dma_mapping_ops hwsw_dma_ops;
void __init
hwsw_init (void)
{
dma_ops = &hwsw_dma_ops;
/* default to a smallish 2MB sw I/O TLB */
if (swiotlb_late_init_with_default_size (2 * (1<<20)) != 0) {
#ifdef CONFIG_IA64_GENERIC

View file

@ -2065,6 +2065,8 @@ static struct acpi_driver acpi_sba_ioc_driver = {
},
};
extern struct dma_mapping_ops swiotlb_dma_ops;
static int __init
sba_init(void)
{
@ -2078,6 +2080,7 @@ sba_init(void)
* a successful kdump kernel boot is to use the swiotlb.
*/
if (is_kdump_kernel()) {
dma_ops = &swiotlb_dma_ops;
if (swiotlb_late_init_with_default_size(64 * (1<<20)) != 0)
panic("Unable to initialize software I/O TLB:"
" Try machvec=dig boot option");
@ -2093,6 +2096,7 @@ sba_init(void)
* If we didn't find something sba_iommu can claim, we
* need to setup the swiotlb and switch to the dig machvec.
*/
dma_ops = &swiotlb_dma_ops;
if (swiotlb_late_init_with_default_size(64 * (1<<20)) != 0)
panic("Unable to find SBA IOMMU or initialize "
"software I/O TLB: Try machvec=dig boot option");
@ -2196,3 +2200,8 @@ struct dma_mapping_ops sba_dma_ops = {
.dma_supported_op = sba_dma_supported,
.mapping_error = sba_dma_mapping_error,
};
void sba_dma_init(void)
{
dma_ops = &sba_dma_ops;
}

View file

@ -298,6 +298,8 @@ extern void machvec_init_from_cmdline(const char *cmdline);
# error Unknown configuration. Update arch/ia64/include/asm/machvec.h.
# endif /* CONFIG_IA64_GENERIC */
extern void swiotlb_dma_init(void);
/*
* Define default versions so we can extend machvec for new platforms without having
* to update the machvec files for all existing platforms.
@ -328,7 +330,7 @@ extern void machvec_init_from_cmdline(const char *cmdline);
# define platform_kernel_launch_event machvec_noop
#endif
#ifndef platform_dma_init
# define platform_dma_init swiotlb_init
# define platform_dma_init swiotlb_dma_init
#endif
#ifndef platform_dma_alloc_coherent
# define platform_dma_alloc_coherent swiotlb_alloc_coherent

View file

@ -2,6 +2,7 @@
#define _ASM_IA64_MACHVEC_HPZX1_h
extern ia64_mv_setup_t dig_setup;
extern ia64_mv_dma_init sba_dma_init;
extern ia64_mv_dma_alloc_coherent sba_alloc_coherent;
extern ia64_mv_dma_free_coherent sba_free_coherent;
extern ia64_mv_dma_map_single_attrs sba_map_single_attrs;
@ -20,7 +21,7 @@ extern ia64_mv_dma_mapping_error sba_dma_mapping_error;
*/
#define platform_name "hpzx1"
#define platform_setup dig_setup
#define platform_dma_init machvec_noop
#define platform_dma_init sba_dma_init
#define platform_dma_alloc_coherent sba_alloc_coherent
#define platform_dma_free_coherent sba_free_coherent
#define platform_dma_map_single_attrs sba_map_single_attrs

View file

@ -55,6 +55,7 @@ extern ia64_mv_readb_t __sn_readb_relaxed;
extern ia64_mv_readw_t __sn_readw_relaxed;
extern ia64_mv_readl_t __sn_readl_relaxed;
extern ia64_mv_readq_t __sn_readq_relaxed;
extern ia64_mv_dma_init sn_dma_init;
extern ia64_mv_dma_alloc_coherent sn_dma_alloc_coherent;
extern ia64_mv_dma_free_coherent sn_dma_free_coherent;
extern ia64_mv_dma_map_single_attrs sn_dma_map_single_attrs;
@ -110,7 +111,7 @@ extern ia64_mv_pci_fixup_bus_t sn_pci_fixup_bus;
#define platform_pci_get_legacy_mem sn_pci_get_legacy_mem
#define platform_pci_legacy_read sn_pci_legacy_read
#define platform_pci_legacy_write sn_pci_legacy_write
#define platform_dma_init machvec_noop
#define platform_dma_init sn_dma_init
#define platform_dma_alloc_coherent sn_dma_alloc_coherent
#define platform_dma_free_coherent sn_dma_free_coherent
#define platform_dma_map_single_attrs sn_dma_map_single_attrs

View file

@ -7,7 +7,7 @@ extra-y := head.o init_task.o vmlinux.lds
obj-y := acpi.o entry.o efi.o efi_stub.o gate-data.o fsys.o ia64_ksyms.o irq.o irq_ia64.o \
irq_lsapic.o ivt.o machvec.o pal.o patch.o process.o perfmon.o ptrace.o sal.o \
salinfo.o setup.o signal.o sys_ia64.o time.o traps.o unaligned.o \
unwind.o mca.o mca_asm.o topology.o
unwind.o mca.o mca_asm.o topology.o dma-mapping.o
obj-$(CONFIG_IA64_BRL_EMU) += brl_emu.o
obj-$(CONFIG_IA64_GENERIC) += acpi-ext.o

View file

@ -0,0 +1,4 @@
#include <linux/dma-mapping.h>
struct dma_mapping_ops *dma_ops;
EXPORT_SYMBOL(dma_ops);

View file

@ -41,8 +41,11 @@ struct device fallback_dev = {
.dma_mask = &fallback_dev.coherent_dma_mask,
};
extern struct dma_mapping_ops vtd_dma_ops;
void __init pci_iommu_alloc(void)
{
dma_ops = &vtd_dma_ops;
/*
* The order of these functions is important for
* fall-back/fail-over reasons
@ -76,9 +79,6 @@ iommu_dma_init(void)
return;
}
struct dma_mapping_ops *dma_ops;
EXPORT_SYMBOL(dma_ops);
int iommu_dma_supported(struct device *dev, u64 mask)
{
struct dma_mapping_ops *ops = get_dma_ops(dev);

View file

@ -37,6 +37,12 @@ struct dma_mapping_ops swiotlb_dma_ops = {
.mapping_error = swiotlb_dma_mapping_error,
};
void swiotlb_dma_init(void)
{
dma_ops = &swiotlb_dma_ops;
swiotlb_init();
}
void __init pci_swiotlb_init(void)
{
if (!iommu_detected) {

View file

@ -481,3 +481,8 @@ struct dma_mapping_ops sn_dma_ops = {
.mapping_error = sn_dma_mapping_error,
.dma_supported_op = sn_dma_supported,
};
void sn_dma_init(void)
{
dma_ops = &sn_dma_ops;
}