SN2 Altix Kernel Patches

3.14.79-sn_dmaa_flush.patch

diff --git a/arch/ia64/sn/pci/pcibr/pcibr_dma.c b/arch/ia64/sn/pci/pcibr/pcibr_dma.c
index 1e863b277ac9..6b632c290af2 100644
--- a/arch/ia64/sn/pci/pcibr/pcibr_dma.c
+++ b/arch/ia64/sn/pci/pcibr/pcibr_dma.c
@@ -235,7 +235,7 @@ pcibr_dma_unmap(struct pci_dev *hwdev, dma_addr_t dma_handle, int direction)
  * unlike the PIC Device(x) Write Request Buffer Flush register.
  */
 
-void sn_dma_flush(u64 addr)
+void sn_dma_flush(unsigned long addr)
 {
 	nasid_t nasid;
 	int is_tio;

3.15Plus-L1SerialBad.patch

--- a/drivers/tty/serial/sn_console.c	2026-03-10 02:01:29.574046221 +0000
+++ b/drivers/tty/serial/sn_console.c	2026-03-10 02:07:36.770519083 +0000
@@ -328,6 +328,8 @@
  */
 static void snp_start_tx(struct uart_port *port)
 {
+	if (uart_circ_empty(&port->state->xmit))
+		return;
 	if (sal_console_port.sc_ops->sal_wakeup_transmit)
 		sal_console_port.sc_ops->sal_wakeup_transmit(&sal_console_port,
 							     TRANSMIT_BUFFERED);

4.19.325-io_resource.patch

diff --git a/arch/ia64/sn/kernel/io_init.c b/arch/ia64/sn/kernel/io_init.c
index d63809a6adfa..2446ffa0957a 100644
--- a/arch/ia64/sn/kernel/io_init.c
+++ b/arch/ia64/sn/kernel/io_init.c
@@ -195,6 +195,9 @@ sn_io_slot_fixup(struct pci_dev *dev)
 		if (res->parent && res->parent->child)
 			release_resource(res);
 
+		/* Ensure resource is marked as assigned so parent lookups succeed */
+		res->flags &= ~IORESOURCE_UNSET;
+
 		if (res->flags & IORESOURCE_IO)
 			insert_resource(&ioport_resource, res);
 		else

5.2-sn2-fix-unchecked-insert_resource-in-sn_io_slot_fixup.patch

diff --git a/arch/ia64/sn/kernel/io_init.c b/arch/ia64/sn/kernel/io_init.c
index 2446ffa0957a..b3c5e7a1d4f2 100644
--- a/arch/ia64/sn/kernel/io_init.c
+++ b/arch/ia64/sn/kernel/io_init.c
@@ -149,6 +149,7 @@ void
 sn_io_slot_fixup(struct pci_dev *dev)
 {
 	int idx;
+	int ret;
 	struct resource *res;
 	unsigned long size;
 	struct pcidev_info *pcidev_info;
@@ -198,10 +199,24 @@ sn_io_slot_fixup(struct pci_dev *dev)
 		/* Ensure resource is marked as assigned so parent lookups succeed */
 		res->flags &= ~IORESOURCE_UNSET;
 
-		if (res->flags & IORESOURCE_IO)
-			insert_resource(&ioport_resource, res);
-		else
-			insert_resource(&iomem_resource, res);
+		if (res->flags & IORESOURCE_IO) {
+			ret = insert_resource(&ioport_resource, res);
+			if (ret) {
+				dev_warn(&dev->dev,
+					 "SN: failed to insert IO resource %d %pR, forcing parent\n",
+					 idx, res);
+				res->parent = &ioport_resource;
+			}
+		} else {
+			ret = insert_resource(&iomem_resource, res);
+			if (ret) {
+				dev_warn(&dev->dev,
+					 "SN: failed to insert MEM resource %d %pR, forcing parent\n",
+					 idx, res);
+				res->parent = &iomem_resource;
+			}
+		}
+
 		/*
 		 * If ROM, mark as shadowed in PROM.
 		 */

5.2-sn2-module_alloc-avoid-VM_FLUSH_RESET_PERMS.patch

--- a/arch/ia64/sn/kernel/setup.c
+++ b/arch/ia64/sn/kernel/setup.c
@@ -29,6 +29,7 @@
 #include <linux/nodemask.h>
 #include <linux/pm.h>
 #include <linux/efi.h>
+#include <linux/vmalloc.h>
 
 #include <asm/io.h>
 #include <asm/sal.h>
@@ -784,3 +785,21 @@
 }
 EXPORT_SYMBOL(sn_prom_feature_available);
 
+/*
+ * SN2-specific module_alloc: allocate executable vmalloc memory WITHOUT
+ * VM_FLUSH_RESET_PERMS.
+ *
+ * That flag is useless on ia64 (set_memory_nx, set_memory_rw, and
+ * set_direct_map_*_noflush are all no-ops).  But it causes
+ * vm_remove_mappings() to force immediate global TLB flushes during
+ * vfree.  On SN2, these extra SHUB PTC.GA broadcasts during module
+ * init section cleanup interfere with concurrent PIO/MMIO traffic.
+ *
+ * See commit 868b104d7379 ("vmalloc: New flag for flush reset").
+ */
+void *module_alloc(unsigned long size)
+{
+	return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END,
+			GFP_KERNEL, PAGE_KERNEL, 0,
+			NUMA_NO_NODE, __builtin_return_address(0));
+}

5.2-sn_mmiowb.patch

diff --git a/arch/ia64/sn/kernel/iomv.c b/arch/ia64/sn/kernel/iomv.c
index 2b22a71663c1..749a2cf399c0 100644
--- a/arch/ia64/sn/kernel/iomv.c
+++ b/arch/ia64/sn/kernel/iomv.c
@@ -75,6 +75,10 @@ void __sn_mmiowb(void)
 	volatile unsigned long *adr = pda->pio_write_status_addr;
 	unsigned long val = pda->pio_write_status_val;
 
+	/*fix for commit 49ca6462fc9e0f5a67cd96eeddd844efc3fb33b9*/
+	if (adr == NULL) 
+        return;
+
 	while ((*adr & SH_PIO_WRITE_STATUS_PENDING_WRITE_COUNT_MASK) != val)
 		cpu_relax();
 }