1 files changed, 66 insertions, 24 deletions

diff --git a/arch/tile/kernel/hardwall.c b/arch/tile/kernel/hardwall.c
index 3bddef710de4..8c41891aab34 100644
--- a/arch/tile/kernel/hardwall.c
+++ b/arch/tile/kernel/hardwall.c
@@ -40,16 +40,25 @@
 struct hardwall_info {
         struct list_head list;             /* "rectangles" list */
         struct list_head task_head;        /* head of tasks in this hardwall */
+        struct cpumask cpumask;            /* cpus in the rectangle */
         int ulhc_x;                        /* upper left hand corner x coord */
         int ulhc_y;                        /* upper left hand corner y coord */
         int width;                         /* rectangle width */
         int height;                        /* rectangle height */
+        int id;                            /* integer id for this hardwall */
         int teardown_in_progress;          /* are we tearing this one down? */
 };
 
 /* Currently allocated hardwall rectangles */
 static LIST_HEAD(rectangles);
 
+/* /proc/tile/hardwall */
+static struct proc_dir_entry *hardwall_proc_dir;
+
+/* Functions to manage files in /proc/tile/hardwall. */
+static void hardwall_add_proc(struct hardwall_info *rect);
+static void hardwall_remove_proc(struct hardwall_info *rect);
+
 /*
  * Guard changes to the hardwall data structures.
  * This could be finer grained (e.g. one lock for the list of hardwall
@@ -105,6 +114,8 @@ static int setup_rectangle(struct hardwall_info *r, struct cpumask *mask)
         r->ulhc_y = cpu_y(ulhc);
         r->width = cpu_x(lrhc) - r->ulhc_x + 1;
         r->height = cpu_y(lrhc) - r->ulhc_y + 1;
+        cpumask_copy(&r->cpumask, mask);
+        r->id = ulhc;   /* The ulhc cpu id can be the hardwall id. */
 
         /* Width and height must be positive */
         if (r->width <= 0 || r->height <= 0)
@@ -388,6 +399,9 @@ static struct hardwall_info *hardwall_create(
         /* Set up appropriate hardwalling on all affected cpus. */
         hardwall_setup(rect);
 
+        /* Create a /proc/tile/hardwall entry. */
+        hardwall_add_proc(rect);
+
         return rect;
 }
 
@@ -645,6 +659,9 @@ static void hardwall_destroy(struct hardwall_info *rect)
         /* Restart switch and disable firewall. */
         on_each_cpu_mask(&mask, restart_udn_switch, NULL, 1);
 
+        /* Remove the /proc/tile/hardwall entry. */
+        hardwall_remove_proc(rect);
+
         /* Now free the rectangle from the list. */
         spin_lock_irqsave(&hardwall_lock, flags);
         BUG_ON(!list_empty(&rect->task_head));
@@ -654,35 +671,57 @@ static void hardwall_destroy(struct hardwall_info *rect)
 }
 
 
-/*
- * Dump hardwall state via /proc; initialized in arch/tile/sys/proc.c.
- */
-int proc_tile_hardwall_show(struct seq_file *sf, void *v)
+static int hardwall_proc_show(struct seq_file *sf, void *v)
 {
-        struct hardwall_info *r;
+        struct hardwall_info *rect = sf->private;
+        char buf[256];
 
-        if (udn_disabled) {
-                seq_printf(sf, "%dx%d 0,0 pids:\n", smp_width, smp_height);
-                return 0;
-        }
-
-        spin_lock_irq(&hardwall_lock);
-        list_for_each_entry(r, &rectangles, list) {
-                struct task_struct *p;
-                seq_printf(sf, "%dx%d %d,%d pids:",
-                           r->width, r->height, r->ulhc_x, r->ulhc_y);
-                list_for_each_entry(p, &r->task_head, thread.hardwall_list) {
-                        unsigned int cpu = cpumask_first(&p->cpus_allowed);
-                        unsigned int x = cpu % smp_width;
-                        unsigned int y = cpu / smp_width;
-                        seq_printf(sf, " %d@%d,%d", p->pid, x, y);
-                }
-                seq_printf(sf, "\n");
-        }
-        spin_unlock_irq(&hardwall_lock);
+        int rc = cpulist_scnprintf(buf, sizeof(buf), &rect->cpumask);
+        buf[rc++] = '\n';
+        seq_write(sf, buf, rc);
         return 0;
 }
 
+static int hardwall_proc_open(struct inode *inode,
+                              struct file *file)
+{
+        return single_open(file, hardwall_proc_show, PDE(inode)->data);
+}
+
+static const struct file_operations hardwall_proc_fops = {
+        .open           = hardwall_proc_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static void hardwall_add_proc(struct hardwall_info *rect)
+{
+        char buf[64];
+        snprintf(buf, sizeof(buf), "%d", rect->id);
+        proc_create_data(buf, 0444, hardwall_proc_dir,
+                         &hardwall_proc_fops, rect);
+}
+
+static void hardwall_remove_proc(struct hardwall_info *rect)
+{
+        char buf[64];
+        snprintf(buf, sizeof(buf), "%d", rect->id);
+        remove_proc_entry(buf, hardwall_proc_dir);
+}
+
+int proc_pid_hardwall(struct task_struct *task, char *buffer)
+{
+        struct hardwall_info *rect = task->thread.hardwall;
+        return rect ? sprintf(buffer, "%d\n", rect->id) : 0;
+}
+
+void proc_tile_hardwall_init(struct proc_dir_entry *root)
+{
+        if (!udn_disabled)
+                hardwall_proc_dir = proc_mkdir("hardwall", root);
+}
+
 
 /*
  * Character device support via ioctl/close.
@@ -716,6 +755,9 @@ static long hardwall_ioctl(struct file *file, unsigned int a, unsigned long b)
                         return -EINVAL;
                 return hardwall_deactivate(current);
 
+        case _HARDWALL_GET_ID:
+                return rect ? rect->id : -EINVAL;
+
         default:
                 return -EINVAL;
         }