x86: Remove the calgary IOMMU driver

The calgary IOMMU was only used on high-end IBM systems in the early
x86_64 age and has no known users left.  Remove it to avoid having to
touch it for pending changes to the DMA API.

Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

Author: Christoph Hellwig

MAINTAINERS

@@ -3629,16 +3629,6 @@ L:	[email protected] (moderated for non-subscribers)
 S:	Maintained
 F:	net/sched/sch_cake.c
 
-CALGARY x86-64 IOMMU
-M:	Muli Ben-Yehuda <[email protected]>
-M:	Jon Mason <[email protected]>
-L:	[email protected]
-S:	Maintained
-F:	arch/x86/kernel/pci-calgary_64.c
-F:	arch/x86/kernel/tce_64.c
-F:	arch/x86/include/asm/calgary.h
-F:	arch/x86/include/asm/tce.h
-
 CAN NETWORK DRIVERS
 M:	Wolfgang Grandegger <[email protected]>
 M:	Marc Kleine-Budde <[email protected]>

arch/x86/Kconfig

@@ -932,36 +932,6 @@ config GART_IOMMU
 
 	  If unsure, say Y.
 
-config CALGARY_IOMMU
-	bool "IBM Calgary IOMMU support"
-	select IOMMU_HELPER
-	select SWIOTLB
-	depends on X86_64 && PCI
-	---help---
-	  Support for hardware IOMMUs in IBM's xSeries x366 and x460
-	  systems. Needed to run systems with more than 3GB of memory
-	  properly with 32-bit PCI devices that do not support DAC
-	  (Double Address Cycle). Calgary also supports bus level
-	  isolation, where all DMAs pass through the IOMMU.  This
-	  prevents them from going anywhere except their intended
-	  destination. This catches hard-to-find kernel bugs and
-	  mis-behaving drivers and devices that do not use the DMA-API
-	  properly to set up their DMA buffers.  The IOMMU can be
-	  turned off at boot time with the iommu=off parameter.
-	  Normally the kernel will make the right choice by itself.
-	  If unsure, say Y.
-
-config CALGARY_IOMMU_ENABLED_BY_DEFAULT
-	def_bool y
-	prompt "Should Calgary be enabled by default?"
-	depends on CALGARY_IOMMU
-	---help---
-	  Should Calgary be enabled by default? if you choose 'y', Calgary
-	  will be used (if it exists). If you choose 'n', Calgary will not be
-	  used even if it exists. If you choose 'n' and would like to use
-	  Calgary anyway, pass 'iommu=calgary' on the kernel command line.
-	  If unsure, say Y.
-
 config MAXSMP
 	bool "Enable Maximum number of SMP Processors and NUMA Nodes"
 	depends on X86_64 && SMP && DEBUG_KERNEL

arch/x86/configs/x86_64_defconfig

@@ -25,7 +25,6 @@ CONFIG_MODULES=y
 CONFIG_MODULE_UNLOAD=y
 CONFIG_MODULE_FORCE_UNLOAD=y
 CONFIG_SMP=y
-CONFIG_CALGARY_IOMMU=y
 CONFIG_NR_CPUS=64
 CONFIG_SCHED_SMT=y
 CONFIG_PREEMPT_VOLUNTARY=y

arch/x86/include/asm/calgary.h

@@ -4,20 +4,6 @@
 
 #ifdef __KERNEL__
 
-#ifdef CONFIG_CALGARY_IOMMU
-static inline void *pci_iommu(struct pci_bus *bus)
-{
-	struct pci_sysdata *sd = bus->sysdata;
-	return sd->iommu;
-}
-
-static inline void set_pci_iommu(struct pci_bus *bus, void *val)
-{
-	struct pci_sysdata *sd = bus->sysdata;
-	sd->iommu = val;
-}
-#endif /* CONFIG_CALGARY_IOMMU */
-
 extern int (*pci_config_read)(int seg, int bus, int dev, int fn,
 			      int reg, int len, u32 *value);
 extern int (*pci_config_write)(int seg, int bus, int dev, int fn,

arch/x86/include/asm/pci_64.h

@@ -146,7 +146,6 @@ ifeq ($(CONFIG_X86_64),y)
 	obj-$(CONFIG_AUDIT)		+= audit_64.o
 
 	obj-$(CONFIG_GART_IOMMU)	+= amd_gart_64.o aperture_64.o
-	obj-$(CONFIG_CALGARY_IOMMU)	+= pci-calgary_64.o tce_64.o
 
 	obj-$(CONFIG_MMCONF_FAM10H)	+= mmconf-fam10h_64.o
 	obj-y				+= vsmp_64.o