Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=41790e04e6656fa1aef205ad9a76ab4edbb5f14a
Commit:     41790e04e6656fa1aef205ad9a76ab4edbb5f14a
Parent:     07cc0c9e65d3e262f871ea357dd77b41950b1ca5
Author:     Ralf Baechle <[EMAIL PROTECTED]>
AuthorDate: Fri Jul 27 19:33:18 2007 +0100
Committer:  Ralf Baechle <[EMAIL PROTECTED]>
CommitDate: Tue Jul 31 21:35:25 2007 +0100

    [MIPS] RP: Pass number of TCs available to RP program in $2.
    
    Signed-off-by: Ralf Baechle <[EMAIL PROTECTED]>
---
 arch/mips/kernel/vpe.c |   82 ++++++++++++++++++++++++++++++++++++++++++-----
 1 files changed, 73 insertions(+), 9 deletions(-)

diff --git a/arch/mips/kernel/vpe.c b/arch/mips/kernel/vpe.c
index c726c47..1323cb6 100644
--- a/arch/mips/kernel/vpe.c
+++ b/arch/mips/kernel/vpe.c
@@ -64,6 +64,10 @@ typedef void *vpe_handle;
 /* If this is set, the section belongs in the init part of the module */
 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1))
 
+/*
+ * The number of TCs and VPEs physically available on the core
+ */
+static int hw_tcs, hw_vpes;
 static char module_name[] = "vpe";
 static int major;
 static const int minor = 1;    /* fixed for now  */
@@ -126,6 +130,8 @@ struct vpe {
 
        /* the list of who wants to know when something major happens */
        struct list_head notify;
+
+       unsigned int ntcs;
 };
 
 struct tc {
@@ -738,6 +744,7 @@ static int vpe_run(struct vpe * v)
         * here...  Or set $a3 to zero and define DFLT_STACK_SIZE and
         * DFLT_HEAP_SIZE when you compile your program
         */
+       mttgpr(6, v->ntcs);
        mttgpr(7, physical_memsize);
 
        /* set up VPE1 */
@@ -1333,16 +1340,60 @@ static void kspd_sp_exit( int sp_id)
 }
 #endif
 
-static struct device *vpe_dev;
+static ssize_t show_ntcs(struct class_device *cd, char *buf)
+{
+       struct vpe *vpe = get_vpe(tclimit);
+
+       return sprintf(buf, "%d\n", vpe->ntcs);
+}
+
+static ssize_t store_ntcs(struct class_device *dev, const char *buf, size_t 
len)
+{
+       struct vpe *vpe = get_vpe(tclimit);
+       unsigned long new;
+       char *endp;
+
+       new = simple_strtoul(buf, &endp, 0);
+       if (endp == buf)
+               goto out_einval;
+
+       if (new == 0 || new > (hw_tcs - tclimit))
+               goto out_einval;
+
+       vpe->ntcs = new;
+
+       return len;
+
+out_einval:
+       return -EINVAL;;
+}
+
+static struct class_device_attribute vpe_class_attributes[] = {
+       __ATTR(ntcs, S_IRUGO | S_IWUSR, show_ntcs, store_ntcs),
+       {}
+};
+
+static void vpe_class_device_release(struct class_device *cd)
+{
+       kfree(cd);
+}
+
+struct class vpe_class = {
+       .name = "vpe",
+       .owner = THIS_MODULE,
+       .release = vpe_class_device_release,
+       .class_dev_attrs = vpe_class_attributes,
+};
+
+struct class_device vpe_device;
 
 static int __init vpe_module_init(void)
 {
        unsigned int mtflags, vpflags;
-       int hw_tcs, hw_vpes, tc, err = 0;
        unsigned long flags, val;
        struct vpe *v = NULL;
-       struct device *dev;
        struct tc *t;
+       int tc, err;
 
        if (!cpu_has_mipsmt) {
                printk("VPE loader: not a MIPS MT capable processor\n");
@@ -1371,13 +1422,22 @@ static int __init vpe_module_init(void)
                return major;
        }
 
-       dev = device_create(mt_class, NULL, MKDEV(major, minor),
-                           "vpe%d", minor);
-       if (IS_ERR(dev)) {
-               err = PTR_ERR(dev);
+       err = class_register(&vpe_class);
+       if (err) {
+               printk(KERN_ERR "vpe_class registration failed\n");
                goto out_chrdev;
        }
-       vpe_dev = dev;
+
+       class_device_initialize(&vpe_device);
+       vpe_device.class        = &vpe_class,
+       vpe_device.parent       = NULL,
+       strlcpy(vpe_device.class_id, "vpe1", BUS_ID_SIZE);
+       vpe_device.devt = MKDEV(major, minor);
+       err = class_device_add(&vpe_device);
+       if (err) {
+               printk(KERN_ERR "Adding vpe_device failed\n");
+               goto out_class;
+       }
 
        local_irq_save(flags);
        mtflags = dmt();
@@ -1422,6 +1482,8 @@ static int __init vpe_module_init(void)
                                goto out_reenable;
                        }
 
+                       v->ntcs = hw_tcs - tclimit;
+
                        /* add the tc to the list of this vpe's tc's. */
                        list_add(&t->tc, &v->tc);
 
@@ -1497,6 +1559,8 @@ out_reenable:
 #endif
        return 0;
 
+out_class:
+       class_unregister(&vpe_class);
 out_chrdev:
        unregister_chrdev(major, module_name);
 
@@ -1514,7 +1578,7 @@ static void __exit vpe_module_exit(void)
                }
        }
 
-       device_destroy(mt_class, MKDEV(major, minor));
+       class_device_del(&vpe_device);
        unregister_chrdev(major, module_name);
 }
 
-
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