ia64: remove support for the SGI SN2 platform

The SGI SN2 (early Altix) is a very non-standard IA64 platform that was
at the very high end of even IA64 hardware, and has been discontinued
a long time ago.  Remove it because there no upstream users left, and it
has magic hooks all over the kernel.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lkml.kernel.org/r/20190813072514.23299-16-hch@lst.de
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/kernel/acpi.c

@@ -96,8 +96,6 @@ acpi_get_sysname(void)
 	} else if (!strcmp(hdr->oem_id, "SGI")) {
 		if (!strcmp(hdr->oem_table_id + 4, "UV"))
 			return "uv";
-		else
-			return "sn2";
 	}
 
 #ifdef CONFIG_INTEL_IOMMU
@@ -407,7 +405,7 @@ get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa)
 	int pxm;
 
 	pxm = pa->proximity_domain_lo;
-	if (ia64_platform_is("sn2") || acpi_srat_revision >= 2)
+	if (acpi_srat_revision >= 2)
 		pxm += pa->proximity_domain_hi[0] << 8;
 	return pxm;
 }
@@ -418,7 +416,7 @@ get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma)
 	int pxm;
 
 	pxm = ma->proximity_domain;
-	if (!ia64_platform_is("sn2") && acpi_srat_revision <= 1)
+	if (acpi_srat_revision <= 1)
 		pxm &= 0xff;
 
 	return pxm;
@@ -710,9 +708,8 @@ int __init acpi_boot_init(void)
 
 	if (acpi_table_parse_madt
 	    (ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) {
-		if (!ia64_platform_is("sn2"))
-			printk(KERN_ERR PREFIX
-			       "Error parsing MADT - no IOSAPIC entries\n");
+		printk(KERN_ERR PREFIX
+		       "Error parsing MADT - no IOSAPIC entries\n");
 	}
 
 	/* System-Level Interrupt Routing */

arch/ia64/kernel/irq.c

@@ -73,17 +73,6 @@ void set_irq_affinity_info (unsigned int irq, int hwid, int redir)
 		irq_redir[irq] = (char) (redir & 0xff);
 	}
 }
-
-bool is_affinity_mask_valid(const struct cpumask *cpumask)
-{
-	if (ia64_platform_is("sn2")) {
-		/* Only allow one CPU to be specified in the smp_affinity mask */
-		if (cpumask_weight(cpumask) != 1)
-			return false;
-	}
-	return true;
-}
-
 #endif /* CONFIG_SMP */
 
 int __init arch_early_irq_init(void)

arch/ia64/kernel/sal.c

@@ -110,13 +110,6 @@ check_versions (struct ia64_sal_systab *systab)
 		sal_revision = SAL_VERSION_CODE(2, 8);
 		sal_version = SAL_VERSION_CODE(0, 0);
 	}
-
-	if (ia64_platform_is("sn2") && (sal_revision == SAL_VERSION_CODE(2, 9)))
-		/*
-		 * SGI Altix has hard-coded version 2.9 in their prom
-		 * but they actually implement 3.2, so let's fix it here.
-		 */
-		sal_revision = SAL_VERSION_CODE(3, 2);
 }
 
 static void __init

arch/ia64/kernel/setup.c

@@ -260,11 +260,11 @@ __initcall(register_memory);
  * in kdump case. See the comment in sba_init() in sba_iommu.c.
  *
  * So, the only machvec that really supports loading the kdump kernel
- * over 4 GB is "sn2".
+ * over 4 GB is "uv".
  */
 static int __init check_crashkernel_memory(unsigned long pbase, size_t size)
 {
-	if (ia64_platform_is("sn2") || ia64_platform_is("uv"))
+	if (ia64_platform_is("uv"))
 		return 1;
 	else
 		return pbase < (1UL << 32);

arch/ia64/kernel/smpboot.c

@@ -57,7 +57,6 @@
 #include <asm/sal.h>
 #include <asm/tlbflush.h>
 #include <asm/unistd.h>
-#include <asm/sn/arch.h>
 
 #define SMP_DEBUG 0
 
@@ -658,11 +657,6 @@ int __cpu_disable(void)
 		return (-EBUSY);
 	}
 
-	if (ia64_platform_is("sn2")) {
-		if (!sn_cpu_disable_allowed(cpu))
-			return -EBUSY;
-	}
-
 	set_cpu_online(cpu, false);
 
 	if (migrate_platform_irqs(cpu)) {

arch/ia64/kernel/uncached.c

@@ -24,7 +24,6 @@
 #include <asm/pgtable.h>
 #include <linux/atomic.h>
 #include <asm/tlbflush.h>
-#include <asm/sn/arch.h>
 
 
 extern void __init efi_memmap_walk_uc(efi_freemem_callback_t, void *);
@@ -129,10 +128,7 @@ static int uncached_add_chunk(struct uncached_pool *uc_pool, int nid)
 
 	preempt_disable();
 
-	if (ia64_platform_is("sn2"))
-		sn_flush_all_caches(uc_addr, IA64_GRANULE_SIZE);
-	else
-		flush_icache_range(uc_addr, uc_addr + IA64_GRANULE_SIZE);
+	flush_icache_range(uc_addr, uc_addr + IA64_GRANULE_SIZE);
 
 	/* flush the just introduced uncached translation from the TLB */
 	local_flush_tlb_all();