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authorLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-16 21:19:45 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-16 21:19:45 -0700
commite0f88db3028798b5e6d62d1c65c991240bf317f3 (patch)
treeca6153883c115108967428ad70b023a6190e889e /arch
parent43c0f3d25c602dc96b201ed81ffda0bc600ff969 (diff)
parentc7754d465b1feade85b5f1c4492781a30f6652a2 (diff)
downloadlinux-2.6.34-ux500-e0f88db3028798b5e6d62d1c65c991240bf317f3.tar.gz
Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6
* master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6: [SPARC64]: Add hypervisor API negotiation and fix console bugs.
Diffstat (limited to 'arch')
-rw-r--r--arch/sparc64/kernel/Makefile2
-rw-r--r--arch/sparc64/kernel/entry.S94
-rw-r--r--arch/sparc64/kernel/hvapi.c189
-rw-r--r--arch/sparc64/kernel/setup.c3
4 files changed, 287 insertions, 1 deletions
diff --git a/arch/sparc64/kernel/Makefile b/arch/sparc64/kernel/Makefile
index 6bf6fb65bc2..c749dccacc3 100644
--- a/arch/sparc64/kernel/Makefile
+++ b/arch/sparc64/kernel/Makefile
@@ -12,7 +12,7 @@ obj-y := process.o setup.o cpu.o idprom.o \
irq.o ptrace.o time.o sys_sparc.o signal.o \
unaligned.o central.o pci.o starfire.o semaphore.o \
power.o sbus.o iommu_common.o sparc64_ksyms.o chmc.o \
- visemul.o prom.o of_device.o
+ visemul.o prom.o of_device.o hvapi.o
obj-$(CONFIG_STACKTRACE) += stacktrace.o
obj-$(CONFIG_PCI) += ebus.o isa.o pci_common.o pci_iommu.o \
diff --git a/arch/sparc64/kernel/entry.S b/arch/sparc64/kernel/entry.S
index c15a3edcb82..732b77cb71f 100644
--- a/arch/sparc64/kernel/entry.S
+++ b/arch/sparc64/kernel/entry.S
@@ -1843,3 +1843,97 @@ sun4v_cpu_state:
mov %o1, %o0
1: retl
nop
+
+ /* %o0: API group number
+ * %o1: pointer to unsigned long major number storage
+ * %o2: pointer to unsigned long minor number storage
+ *
+ * returns %o0: status
+ */
+ .globl sun4v_get_version
+sun4v_get_version:
+ mov HV_CORE_GET_VER, %o5
+ mov %o1, %o3
+ mov %o2, %o4
+ ta HV_CORE_TRAP
+ stx %o1, [%o3]
+ retl
+ stx %o2, [%o4]
+
+ /* %o0: API group number
+ * %o1: desired major number
+ * %o2: desired minor number
+ * %o3: pointer to unsigned long actual minor number storage
+ *
+ * returns %o0: status
+ */
+ .globl sun4v_set_version
+sun4v_set_version:
+ mov HV_CORE_SET_VER, %o5
+ mov %o3, %o4
+ ta HV_CORE_TRAP
+ retl
+ stx %o1, [%o4]
+
+ /* %o0: pointer to unsigned long status
+ *
+ * returns %o0: signed character
+ */
+ .globl sun4v_con_getchar
+sun4v_con_getchar:
+ mov %o0, %o4
+ mov HV_FAST_CONS_GETCHAR, %o5
+ clr %o0
+ clr %o1
+ ta HV_FAST_TRAP
+ stx %o0, [%o4]
+ retl
+ sra %o1, 0, %o0
+
+ /* %o0: signed long character
+ *
+ * returns %o0: status
+ */
+ .globl sun4v_con_putchar
+sun4v_con_putchar:
+ mov HV_FAST_CONS_PUTCHAR, %o5
+ ta HV_FAST_TRAP
+ retl
+ sra %o0, 0, %o0
+
+ /* %o0: buffer real address
+ * %o1: buffer size
+ * %o2: pointer to unsigned long bytes_read
+ *
+ * returns %o0: status
+ */
+ .globl sun4v_con_read
+sun4v_con_read:
+ mov %o2, %o4
+ mov HV_FAST_CONS_READ, %o5
+ ta HV_FAST_TRAP
+ brnz %o0, 1f
+ cmp %o1, -1 /* break */
+ be,a,pn %icc, 1f
+ mov %o1, %o0
+ cmp %o1, -2 /* hup */
+ be,a,pn %icc, 1f
+ mov %o1, %o0
+ stx %o1, [%o4]
+1: retl
+ nop
+
+ /* %o0: buffer real address
+ * %o1: buffer size
+ * %o2: pointer to unsigned long bytes_written
+ *
+ * returns %o0: status
+ */
+ .globl sun4v_con_write
+sun4v_con_write:
+ mov %o2, %o4
+ mov HV_FAST_CONS_WRITE, %o5
+ ta HV_FAST_TRAP
+ stx %o1, [%o4]
+ retl
+ nop
diff --git a/arch/sparc64/kernel/hvapi.c b/arch/sparc64/kernel/hvapi.c
new file mode 100644
index 00000000000..f03ffc829c7
--- /dev/null
+++ b/arch/sparc64/kernel/hvapi.c
@@ -0,0 +1,189 @@
+/* hvapi.c: Hypervisor API management.
+ *
+ * Copyright (C) 2007 David S. Miller <davem@davemloft.net>
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+
+#include <asm/hypervisor.h>
+#include <asm/oplib.h>
+
+/* If the hypervisor indicates that the API setting
+ * calls are unsupported, by returning HV_EBADTRAP or
+ * HV_ENOTSUPPORTED, we assume that API groups with the
+ * PRE_API flag set are major 1 minor 0.
+ */
+struct api_info {
+ unsigned long group;
+ unsigned long major;
+ unsigned long minor;
+ unsigned int refcnt;
+ unsigned int flags;
+#define FLAG_PRE_API 0x00000001
+};
+
+static struct api_info api_table[] = {
+ { .group = HV_GRP_SUN4V, .flags = FLAG_PRE_API },
+ { .group = HV_GRP_CORE, .flags = FLAG_PRE_API },
+ { .group = HV_GRP_INTR, },
+ { .group = HV_GRP_SOFT_STATE, },
+ { .group = HV_GRP_PCI, .flags = FLAG_PRE_API },
+ { .group = HV_GRP_LDOM, },
+ { .group = HV_GRP_SVC_CHAN, .flags = FLAG_PRE_API },
+ { .group = HV_GRP_NCS, .flags = FLAG_PRE_API },
+ { .group = HV_GRP_NIAG_PERF, .flags = FLAG_PRE_API },
+ { .group = HV_GRP_FIRE_PERF, },
+ { .group = HV_GRP_DIAG, .flags = FLAG_PRE_API },
+};
+
+static DEFINE_SPINLOCK(hvapi_lock);
+
+static struct api_info *__get_info(unsigned long group)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(api_table); i++) {
+ if (api_table[i].group == group)
+ return &api_table[i];
+ }
+ return NULL;
+}
+
+static void __get_ref(struct api_info *p)
+{
+ p->refcnt++;
+}
+
+static void __put_ref(struct api_info *p)
+{
+ if (--p->refcnt == 0) {
+ unsigned long ignore;
+
+ sun4v_set_version(p->group, 0, 0, &ignore);
+ p->major = p->minor = 0;
+ }
+}
+
+/* Register a hypervisor API specification. It indicates the
+ * API group and desired major+minor.
+ *
+ * If an existing API registration exists '0' (success) will
+ * be returned if it is compatible with the one being registered.
+ * Otherwise a negative error code will be returned.
+ *
+ * Otherwise an attempt will be made to negotiate the requested
+ * API group/major/minor with the hypervisor, and errors returned
+ * if that does not succeed.
+ */
+int sun4v_hvapi_register(unsigned long group, unsigned long major,
+ unsigned long *minor)
+{
+ struct api_info *p;
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&hvapi_lock, flags);
+ p = __get_info(group);
+ ret = -EINVAL;
+ if (p) {
+ if (p->refcnt) {
+ ret = -EINVAL;
+ if (p->major == major) {
+ *minor = p->minor;
+ ret = 0;
+ }
+ } else {
+ unsigned long actual_minor;
+ unsigned long hv_ret;
+
+ hv_ret = sun4v_set_version(group, major, *minor,
+ &actual_minor);
+ ret = -EINVAL;
+ if (hv_ret == HV_EOK) {
+ *minor = actual_minor;
+ p->major = major;
+ p->minor = actual_minor;
+ ret = 0;
+ } else if (hv_ret == HV_EBADTRAP ||
+ HV_ENOTSUPPORTED) {
+ if (p->flags & FLAG_PRE_API) {
+ if (major == 1) {
+ p->major = 1;
+ p->minor = 0;
+ *minor = 0;
+ ret = 0;
+ }
+ }
+ }
+ }
+
+ if (ret == 0)
+ __get_ref(p);
+ }
+ spin_unlock_irqrestore(&hvapi_lock, flags);
+
+ return ret;
+}
+EXPORT_SYMBOL(sun4v_hvapi_register);
+
+void sun4v_hvapi_unregister(unsigned long group)
+{
+ struct api_info *p;
+ unsigned long flags;
+
+ spin_lock_irqsave(&hvapi_lock, flags);
+ p = __get_info(group);
+ if (p)
+ __put_ref(p);
+ spin_unlock_irqrestore(&hvapi_lock, flags);
+}
+EXPORT_SYMBOL(sun4v_hvapi_unregister);
+
+int sun4v_hvapi_get(unsigned long group,
+ unsigned long *major,
+ unsigned long *minor)
+{
+ struct api_info *p;
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&hvapi_lock, flags);
+ ret = -EINVAL;
+ p = __get_info(group);
+ if (p && p->refcnt) {
+ *major = p->major;
+ *minor = p->minor;
+ ret = 0;
+ }
+ spin_unlock_irqrestore(&hvapi_lock, flags);
+
+ return ret;
+}
+EXPORT_SYMBOL(sun4v_hvapi_get);
+
+void __init sun4v_hvapi_init(void)
+{
+ unsigned long group, major, minor;
+
+ group = HV_GRP_SUN4V;
+ major = 1;
+ minor = 0;
+ if (sun4v_hvapi_register(group, major, &minor))
+ goto bad;
+
+ group = HV_GRP_CORE;
+ major = 1;
+ minor = 1;
+ if (sun4v_hvapi_register(group, major, &minor))
+ goto bad;
+
+ return;
+
+bad:
+ prom_printf("HVAPI: Cannot register API group "
+ "%lx with major(%u) minor(%u)\n",
+ group, major, minor);
+ prom_halt();
+}
diff --git a/arch/sparc64/kernel/setup.c b/arch/sparc64/kernel/setup.c
index 451028341c7..dea9c3c9ec5 100644
--- a/arch/sparc64/kernel/setup.c
+++ b/arch/sparc64/kernel/setup.c
@@ -269,6 +269,7 @@ void __init per_cpu_patch(void)
void __init sun4v_patch(void)
{
+ extern void sun4v_hvapi_init(void);
struct sun4v_1insn_patch_entry *p1;
struct sun4v_2insn_patch_entry *p2;
@@ -300,6 +301,8 @@ void __init sun4v_patch(void)
p2++;
}
+
+ sun4v_hvapi_init();
}
#ifdef CONFIG_SMP