Add a /proc node for the VMI sub-arch, which gives information on the VMI ROM
detected using /proc/vmi/info and a list of kernel annotations in
/proc/vmi/annotations.
The timing information is VMware specific, and should probably be put into a
separate /proc node (and a separate patch for our internal use).
Signed-off-by: Zachary Amsden <zach@xxxxxxxxxx>
Index: linux-2.6.16-rc5/arch/i386/mach-vmi/proc.c
===================================================================
--- linux-2.6.16-rc5.orig/arch/i386/mach-vmi/proc.c 2006-03-08
11:02:57.000000000 -0800
+++ linux-2.6.16-rc5/arch/i386/mach-vmi/proc.c 2006-03-08 11:03:00.000000000
-0800
@@ -0,0 +1,194 @@
+/*
+ * VMI proc stats interface
+ *
+ * Copyright (C) 2005, VMware, Inc.
+ *
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT. See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Send feedback to zach@xxxxxxxxxx
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/spinlock.h>
+#include <linux/string.h>
+#include <linux/seq_file.h>
+#include <linux/proc_fs.h>
+#include <linux/init.h>
+#include <asm/processor.h>
+#include <vmi.h>
+
+extern VROMHeader *vmi_rom;
+static struct proc_dir_entry *proc_vmi_root;
+
+struct pnp_header {
+ char sig[4];
+ char rev;
+ char size;
+ short next;
+ short res;
+ long devID;
+ unsigned short manufacturer_offset;
+ unsigned short product_offset;
+} __attribute__((packed));
+
+/* XXX This hack can only be used with passthrough TSC */
+static inline unsigned long long get_tsc(void)
+{
+ unsigned long long tsc;
+ asm volatile("rdtsc" : "=&A" (tsc));
+ return tsc;
+}
+
+static unsigned long long hypercall_cycles = 0xffffffffULL;
+static void time_hypercall(void)
+{
+ unsigned long long tsc_start, tsc_end, cycles;
+ int i;
+ for (i = 0; i < 1000; i++) {
+ tsc_start = get_tsc();
+ vmi_rdtsc();
+ tsc_end = get_tsc();
+ cycles = tsc_end - tsc_start;
+ if (cycles < hypercall_cycles)
+ hypercall_cycles = cycles;
+ }
+}
+
+static unsigned long long page_fault_cycles = 0xffffffffULL;
+static void time_page_fault(void)
+{
+ unsigned long long tsc_start, tsc_end, cycles;
+ int i;
+ for (i = 0; i < 1000; i++) {
+ tsc_start = get_tsc();
+ asm volatile(
+ "1: mov %%eax,0 \n"
+ "2: \n"
+ ".section __ex_table,\"a\"\n"
+ " .align 4 \n"
+ " .long 1b,2b \n"
+ ".previous \n"
+ ::: "memory");
+ tsc_end = get_tsc();
+ cycles = tsc_end - tsc_start;
+ if (cycles < page_fault_cycles)
+ page_fault_cycles = cycles;
+ }
+}
+
+static int proc_vmi_info_show(struct seq_file *m, void *v)
+{
+ if (!hypervisor_found)
+ seq_puts(m, "No VMI active\n");
+ else
+ seq_puts(m, "Hypervisor VMI active\n");
+ seq_printf(m, "Kernel VMI API version %d.%d\n",
+ VMI_API_REV_MAJOR, MIN_VMI_API_REV_MINOR);
+ if (vmi_rom) {
+ seq_printf(m, "VMI ROM API version: %d.%d\n",
+ vmi_rom->APIVersionMajor,
+ vmi_rom->APIVersionMinor);
+ seq_printf(m, " rom size: %d\n",
+ vmi_rom->romLength * 512);
+ seq_printf(m, " mapped at: %08x\n", (uint32_t)vmi_rom);
+ if (vmi_rom->pnpHeaderOffset) {
+ struct pnp_header *h = (struct pnp_header *)
+ ((char *)vmi_rom+vmi_rom->pnpHeaderOffset);
+ seq_printf(m, " manufacturer: %s\n",
+ (char *)vmi_rom+h->manufacturer_offset);
+ seq_printf(m, " product: %s\n",
+ (char *)vmi_rom+h->product_offset);
+ }
+ }
+ time_hypercall();
+ seq_printf(m, "Hypercall cycle count: %lld\n", hypercall_cycles);
+ time_page_fault();
+ seq_printf(m, "Kernel #PF cycle count: %lld\n", page_fault_cycles);
+
+ return 0;
+}
+
+static int proc_vmi_info_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, proc_vmi_info_show, NULL);
+}
+
+static struct file_operations proc_vmi_info_operations = {
+ .open = proc_vmi_info_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+#define VDEF(call) #call ,
+static char *vmi_call_name[] = {
+ VMI_CALLS
+};
+#undef VDEF
+
+static void print_annotation(struct seq_file *m, struct vmi_annotation *a)
+{
+ seq_printf(m, "%s %p %d %p %d %d\n",
+ vmi_call_name[a->vmi_call], a->nativeEIP, a->native_size,
+ a->translationEIP, a->translation_size, a->nop_size);
+}
+
+static int proc_vmi_annotations_show(struct seq_file *m, void *v)
+{
+ struct vmi_annotation *start = __vmi_annotation;
+ struct vmi_annotation *end = __vmi_annotation_end;
+ struct vmi_annotation *a;
+
+ for (a = start; a < end; a++) {
+ print_annotation(m, a);
+ }
+ return 0;
+}
+
+static int proc_vmi_annotations_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, proc_vmi_annotations_show, NULL);
+}
+
+static struct file_operations proc_vmi_annotations_operations = {
+ .open = proc_vmi_annotations_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static int __init proc_vmi_init(void)
+{
+ struct proc_dir_entry *e;
+
+ proc_vmi_root = proc_mkdir("vmi", NULL);
+ if (proc_vmi_root) {
+ e = create_proc_entry("info", 0, proc_vmi_root);
+ if (e)
+ e->proc_fops = &proc_vmi_info_operations;
+ e = create_proc_entry("annotations", 0, proc_vmi_root);
+ if (e)
+ e->proc_fops = &proc_vmi_annotations_operations;
+ }
+ return 0;
+}
+
+__initcall(proc_vmi_init);
Index: linux-2.6.16-rc5/arch/i386/mach-vmi/Makefile
===================================================================
--- linux-2.6.16-rc5.orig/arch/i386/mach-vmi/Makefile 2006-03-08
11:02:43.000000000 -0800
+++ linux-2.6.16-rc5/arch/i386/mach-vmi/Makefile 2006-03-08
11:03:12.000000000 -0800
@@ -6,4 +6,4 @@ EXTRA_CFLAGS += -I../kernel
export CFLAGS_stubs.o += -ffunction-sections
-obj-y := setup.o stubs.o stubs-asm.o smpboot_hooks.o
+obj-y := setup.o stubs.o stubs-asm.o smpboot_hooks.o proc.o
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