patch-2.4.19 linux-2.4.19/arch/ia64/sn/io/sn1/hub_intr.c

• Lines: 308
• Date: Fri Aug 2 17:39:43 2002
• Orig file: linux-2.4.18/arch/ia64/sn/io/sn1/hub_intr.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.18/arch/ia64/sn/io/sn1/hub_intr.c linux-2.4.19/arch/ia64/sn/io/sn1/hub_intr.c
@@ -0,0 +1,307 @@
+/* $Id: hub_intr.c,v 1.1 2002/02/28 17:31:25 marcelo Exp $
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1992-1997, 2000-2002 Silicon Graphics, Inc.  All Rights Reserved.
+ */
+
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <asm/sn/types.h>
+#include <asm/sn/sgi.h>
+#include <asm/sn/driver.h>
+#include <asm/sn/iograph.h>
+#include <asm/param.h>
+#include <asm/sn/pio.h>
+#include <asm/sn/xtalk/xwidget.h>
+#include <asm/sn/io.h>
+#include <asm/sn/sn_private.h>
+#include <asm/sn/addrs.h>
+#include <asm/sn/invent.h>
+#include <asm/sn/hcl.h>
+#include <asm/sn/hcl_util.h>
+#include <asm/sn/intr.h>
+#include <asm/sn/xtalk/xtalkaddrs.h>
+#include <asm/sn/klconfig.h>
+#include <asm/sn/sn_cpuid.h>
+
+extern xtalk_provider_t hub_provider;
+
+/* ARGSUSED */
+void
+hub_intr_init(devfs_handle_t hubv)
+{
+}
+
+/*
+ * hub_device_desc_update
+ *	Update the passed in device descriptor with the actual the
+ * 	target cpu number and interrupt priority level.
+ *	NOTE : These might be the same as the ones passed in thru
+ *	the descriptor.
+ */
+static void
+hub_device_desc_update(device_desc_t 	dev_desc, 
+		       ilvl_t 		intr_swlevel,
+		       cpuid_t		cpu)
+{
+}
+
+int allocate_my_bit = INTRCONNECT_ANYBIT;
+
+/*
+ * Allocate resources required for an interrupt as specified in dev_desc.
+ * Returns a hub interrupt handle on success, or 0 on failure.
+ */
+static hub_intr_t
+do_hub_intr_alloc(devfs_handle_t dev,		/* which crosstalk device */
+		  device_desc_t dev_desc,	/* device descriptor */
+		  devfs_handle_t owner_dev,	/* owner of this interrupt, if known */
+		  int uncond_nothread)		/* unconditionally non-threaded */
+{
+	cpuid_t cpu = (cpuid_t)0;			/* cpu to receive interrupt */
+        int cpupicked = 0;
+	int bit;			/* interrupt vector */
+	/*REFERENCED*/
+	int intr_resflags = 0;
+	hub_intr_t intr_hdl;
+	cnodeid_t nodeid;		/* node to receive interrupt */
+	/*REFERENCED*/
+	nasid_t nasid;			/* nasid to receive interrupt */
+	struct xtalk_intr_s *xtalk_info;
+	iopaddr_t xtalk_addr;		/* xtalk addr on hub to set intr */
+	xwidget_info_t xwidget_info;	/* standard crosstalk widget info handle */
+	char *intr_name = NULL;
+	ilvl_t intr_swlevel = (ilvl_t)0;
+	extern int default_intr_pri;
+	extern void synergy_intr_alloc(int, int);
+
+
+	if (dev_desc) {
+		if (dev_desc->flags & D_INTR_ISERR) {
+			intr_resflags = II_ERRORINT;
+		} else if (!uncond_nothread && !(dev_desc->flags & D_INTR_NOTHREAD)) {
+			intr_resflags = II_THREADED;
+		} else {
+			/* Neither an error nor a thread. */
+			intr_resflags = 0;
+		}
+	} else {
+		intr_swlevel = default_intr_pri;
+		if (!uncond_nothread)
+			intr_resflags = II_THREADED;
+	}
+
+	/* XXX - Need to determine if the interrupt should be threaded. */
+
+	/* If the cpu has not been picked already then choose a candidate 
+	 * interrupt target and reserve the interrupt bit 
+	 */
+	if (!cpupicked) {
+		cpu = intr_heuristic(dev,dev_desc,allocate_my_bit,
+				     intr_resflags,owner_dev,
+				     intr_name,&bit);
+	}
+
+	/* At this point we SHOULD have a valid cpu */
+	if (cpu == CPU_NONE) {
+#if defined(SUPPORT_PRINTING_V_FORMAT)
+		printk(KERN_WARNING  "%v hub_intr_alloc could not allocate interrupt\n",
+			owner_dev);
+#else
+		printk(KERN_WARNING  "%p hub_intr_alloc could not allocate interrupt\n",
+			(void *)owner_dev);
+#endif
+		return(0);
+
+	}
+
+	/* If the cpu has been picked already (due to the bridge data 
+	 * corruption bug) then try to reserve an interrupt bit .
+	 */
+	if (cpupicked) {
+		bit = intr_reserve_level(cpu, allocate_my_bit, 
+					 intr_resflags, 
+					 owner_dev, intr_name);
+		if (bit < 0) {
+#if defined(SUPPORT_PRINTING_V_FORMAT)
+			printk(KERN_WARNING  "Could not reserve an interrupt bit for cpu "
+				" %d and dev %v\n",
+				cpu,owner_dev);
+#else
+			printk(KERN_WARNING  "Could not reserve an interrupt bit for cpu "
+				" %d and dev %p\n",
+				(int)cpu, (void *)owner_dev);
+#endif
+				
+			return(0);
+		}
+	}
+
+	nodeid = cpuid_to_cnodeid(cpu);
+	nasid = cpuid_to_nasid(cpu);
+	xtalk_addr = HUBREG_AS_XTALKADDR(nasid, PIREG(PI_INT_PEND_MOD, cpuid_to_subnode(cpu)));
+
+	/*
+	 * Allocate an interrupt handle, and fill it in.  There are two
+	 * pieces to an interrupt handle: the piece needed by generic
+	 * xtalk code which is used by crosstalk device drivers, and
+	 * the piece needed by low-level IP27 hardware code.
+	 */
+	intr_hdl = snia_kmem_alloc_node(sizeof(struct hub_intr_s), KM_NOSLEEP, nodeid);
+	ASSERT_ALWAYS(intr_hdl);
+
+	/* 
+	 * Fill in xtalk information for generic xtalk interfaces that
+	 * operate on xtalk_intr_hdl's.
+	 */
+	xtalk_info = &intr_hdl->i_xtalk_info;
+	xtalk_info->xi_dev = dev;
+	xtalk_info->xi_vector = bit;
+	xtalk_info->xi_addr = xtalk_addr;
+
+	/*
+	 * Regardless of which CPU we ultimately interrupt, a given crosstalk
+	 * widget always handles interrupts (and PIO and DMA) through its 
+	 * designated "master" crosstalk provider.
+	 */
+	xwidget_info = xwidget_info_get(dev);
+	if (xwidget_info)
+		xtalk_info->xi_target = xwidget_info_masterid_get(xwidget_info);
+
+	/* Fill in low level hub information for hub_* interrupt interface */
+	intr_hdl->i_swlevel = intr_swlevel;
+	intr_hdl->i_cpuid = cpu;
+	intr_hdl->i_bit = bit;
+	intr_hdl->i_flags = HUB_INTR_IS_ALLOCED;
+
+	/* Store the actual interrupt priority level & interrupt target
+	 * cpu back in the device descriptor.
+	 */
+	hub_device_desc_update(dev_desc, intr_swlevel, cpu);
+	synergy_intr_alloc((int)bit, (int)cpu);
+	return(intr_hdl);
+}
+
+/*
+ * Allocate resources required for an interrupt as specified in dev_desc.
+ * Returns a hub interrupt handle on success, or 0 on failure.
+ */
+hub_intr_t
+hub_intr_alloc(	devfs_handle_t dev,		/* which crosstalk device */
+		device_desc_t dev_desc,		/* device descriptor */
+		devfs_handle_t owner_dev)		/* owner of this interrupt, if known */
+{
+	return(do_hub_intr_alloc(dev, dev_desc, owner_dev, 0));
+}
+
+/*
+ * Allocate resources required for an interrupt as specified in dev_desc.
+ * Uncondtionally request non-threaded, regardless of what the device
+ * descriptor might say.
+ * Returns a hub interrupt handle on success, or 0 on failure.
+ */
+hub_intr_t
+hub_intr_alloc_nothd(devfs_handle_t dev,		/* which crosstalk device */
+		device_desc_t dev_desc,		/* device descriptor */
+		devfs_handle_t owner_dev)		/* owner of this interrupt, if known */
+{
+	return(do_hub_intr_alloc(dev, dev_desc, owner_dev, 1));
+}
+
+/*
+ * Free resources consumed by intr_alloc.
+ */
+void
+hub_intr_free(hub_intr_t intr_hdl)
+{
+	cpuid_t cpu = intr_hdl->i_cpuid;
+	int bit = intr_hdl->i_bit;
+	xtalk_intr_t xtalk_info;
+
+	if (intr_hdl->i_flags & HUB_INTR_IS_CONNECTED) {
+		/* Setting the following fields in the xtalk interrupt info
+	 	 * clears the interrupt target register in the xtalk user
+	 	 */
+		xtalk_info = &intr_hdl->i_xtalk_info;
+		xtalk_info->xi_dev = NODEV;
+		xtalk_info->xi_vector = 0;
+		xtalk_info->xi_addr = 0;
+		hub_intr_disconnect(intr_hdl);
+	}
+
+	if (intr_hdl->i_flags & HUB_INTR_IS_ALLOCED)
+		kfree(intr_hdl);
+
+	intr_unreserve_level(cpu, bit);
+}
+
+
+/*
+ * Associate resources allocated with a previous hub_intr_alloc call with the
+ * described handler, arg, name, etc.
+ */
+/*ARGSUSED*/
+int
+hub_intr_connect(	hub_intr_t intr_hdl,		/* xtalk intr resource handle */
+			xtalk_intr_setfunc_t setfunc,	/* func to set intr hw */
+			void *setfunc_arg)		/* arg to setfunc */
+{
+	int rv;
+	cpuid_t cpu = intr_hdl->i_cpuid;
+	int bit = intr_hdl->i_bit;
+	extern int synergy_intr_connect(int, int);
+
+	ASSERT(intr_hdl->i_flags & HUB_INTR_IS_ALLOCED);
+
+	rv = intr_connect_level(cpu, bit, intr_hdl->i_swlevel, NULL);
+	if (rv < 0)
+		return(rv);
+
+	intr_hdl->i_xtalk_info.xi_setfunc = setfunc;
+	intr_hdl->i_xtalk_info.xi_sfarg = setfunc_arg;
+
+	if (setfunc) (*setfunc)((xtalk_intr_t)intr_hdl);
+
+	intr_hdl->i_flags |= HUB_INTR_IS_CONNECTED;
+	return(synergy_intr_connect((int)bit, (int)cpu));
+}
+
+
+/*
+ * Disassociate handler with the specified interrupt.
+ */
+void
+hub_intr_disconnect(hub_intr_t intr_hdl)
+{
+	/*REFERENCED*/
+	int rv;
+	cpuid_t cpu = intr_hdl->i_cpuid;
+	int bit = intr_hdl->i_bit;
+	xtalk_intr_setfunc_t setfunc;
+
+	setfunc = intr_hdl->i_xtalk_info.xi_setfunc;
+
+	/* TBD: send disconnected interrupts somewhere harmless */
+	if (setfunc) (*setfunc)((xtalk_intr_t)intr_hdl);
+
+	rv = intr_disconnect_level(cpu, bit);
+	ASSERT(rv == 0);
+	intr_hdl->i_flags &= ~HUB_INTR_IS_CONNECTED;
+}
+
+
+/*
+ * Return a hwgraph vertex that represents the CPU currently
+ * targeted by an interrupt.
+ */
+devfs_handle_t
+hub_intr_cpu_get(hub_intr_t intr_hdl)
+{
+	cpuid_t cpuid = intr_hdl->i_cpuid;
+	ASSERT(cpuid != CPU_NONE);
+
+	return(cpuid_to_vertex(cpuid));
+}