[Xen-devel] [RFC, PATCH 21/24] i386 Vmi proc node

[Zachary Amsden <zach@xxxxxxxxxx>]

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

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel