bitmap, irq: add smp_affinity_list interface to /proc/irq

Manually adjusting the smp_affinity for IRQ's becomes unwieldy when the
cpu count is large.

Setting smp affinity to cpus 256 to 263 would be:

	echo 000000ff,00000000,00000000,00000000,00000000,00000000,00000000,00000000 > smp_affinity

instead of:

	echo 256-263 > smp_affinity_list

Think about what it looks like for cpus around say, 4088 to 4095.

We already have many alternate "list" interfaces:

/sys/devices/system/cpu/cpuX/indexY/shared_cpu_list
/sys/devices/system/cpu/cpuX/topology/thread_siblings_list
/sys/devices/system/cpu/cpuX/topology/core_siblings_list
/sys/devices/system/node/nodeX/cpulist
/sys/devices/pci***/***/local_cpulist

Add a companion interface, smp_affinity_list to use cpu lists instead of
cpu maps.  This conforms to other companion interfaces where both a map
and a list interface exists.

This required adding a bitmap_parselist_user() function in a manner
similar to the bitmap_parse_user() function.

[akpm@linux-foundation.org: make __bitmap_parselist() static]
Signed-off-by: Mike Travis <travis@sgi.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jack Steiner <steiner@sgi.com>
Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

6 files changed, 188 insertions, 23 deletions

diff --git a/Documentation/IRQ-affinity.txt b/Documentation/IRQ-affinity.txt
index b4a615b78403..7890fae18529 100644
--- a/Documentation/IRQ-affinity.txt
+++ b/Documentation/IRQ-affinity.txt
@@ -4,10 +4,11 @@ ChangeLog:
 
 SMP IRQ affinity
 
-/proc/irq/IRQ#/smp_affinity specifies which target CPUs are permitted
-for a given IRQ source. It's a bitmask of allowed CPUs. It's not allowed
-to turn off all CPUs, and if an IRQ controller does not support IRQ
-affinity then the value will not change from the default 0xffffffff.
+/proc/irq/IRQ#/smp_affinity and /proc/irq/IRQ#/smp_affinity_list specify
+which target CPUs are permitted for a given IRQ source.  It's a bitmask
+(smp_affinity) or cpu list (smp_affinity_list) of allowed CPUs.  It's not
+allowed to turn off all CPUs, and if an IRQ controller does not support
+IRQ affinity then the value will not change from the default of all cpus.
 
 /proc/irq/default_smp_affinity specifies default affinity mask that applies
 to all non-active IRQs. Once IRQ is allocated/activated its affinity bitmask
@@ -54,3 +55,11 @@ round-trip min/avg/max = 0.1/0.5/585.4 ms
 This time around IRQ44 was delivered only to the last four processors.
 i.e counters for the CPU0-3 did not change.
 
+Here is an example of limiting that same irq (44) to cpus 1024 to 1031:
+
+[root@moon 44]# echo 1024-1031 > smp_affinity
+[root@moon 44]# cat smp_affinity
+1024-1031
+
+Note that to do this with a bitmask would require 32 bitmasks of zero
+to follow the pertinent one.
diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
index 60740e8ecb37..f48178024067 100644
--- a/Documentation/filesystems/proc.txt
+++ b/Documentation/filesystems/proc.txt
@@ -574,6 +574,12 @@ The contents of each smp_affinity file is the same by default:
   > cat /proc/irq/0/smp_affinity
   ffffffff
 
+There is an alternate interface, smp_affinity_list which allows specifying
+a cpu range instead of a bitmask:
+
+  > cat /proc/irq/0/smp_affinity_list
+  1024-1031
+
 The default_smp_affinity mask applies to all non-active IRQs, which are the
 IRQs which have not yet been allocated/activated, and hence which lack a
 /proc/irq/[0-9]* directory.
@@ -583,12 +589,13 @@ reports itself as being attached. This hardware locality information does not
 include information about any possible driver locality preference.
 
 prof_cpu_mask specifies which CPUs are to be profiled by the system wide
-profiler. Default value is ffffffff (all cpus).
+profiler. Default value is ffffffff (all cpus if there are only 32 of them).
 
 The way IRQs are routed is handled by the IO-APIC, and it's Round Robin
 between all the CPUs which are allowed to handle it. As usual the kernel has
 more info than you and does a better job than you, so the defaults are the
-best choice for almost everyone.
+best choice for almost everyone.  [Note this applies only to those IO-APIC's
+that support "Round Robin" interrupt distribution.]
 
 There are  three  more  important subdirectories in /proc: net, scsi, and sys.
 The general  rule  is  that  the  contents,  or  even  the  existence of these
diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h
index daf8c480c786..dcafe0bf0005 100644
--- a/include/linux/bitmap.h
+++ b/include/linux/bitmap.h
@@ -55,7 +55,8 @@
  * bitmap_parse(buf, buflen, dst, nbits)        Parse bitmap dst from kernel buf
  * bitmap_parse_user(ubuf, ulen, dst, nbits)    Parse bitmap dst from user buf
  * bitmap_scnlistprintf(buf, len, src, nbits)   Print bitmap src as list to buf
- * bitmap_parselist(buf, dst, nbits)            Parse bitmap dst from list
+ * bitmap_parselist(buf, dst, nbits)            Parse bitmap dst from kernel buf
+ * bitmap_parselist_user(buf, dst, nbits)       Parse bitmap dst from user buf
  * bitmap_find_free_region(bitmap, bits, order) Find and allocate bit region
  * bitmap_release_region(bitmap, pos, order)    Free specified bit region
  * bitmap_allocate_region(bitmap, pos, order)   Allocate specified bit region
@@ -129,6 +130,8 @@ extern int bitmap_scnlistprintf(char *buf, unsigned int len,
                         const unsigned long *src, int nbits);
 extern int bitmap_parselist(const char *buf, unsigned long *maskp,
                         int nmaskbits);
+extern int bitmap_parselist_user(const char __user *ubuf, unsigned int ulen,
+                        unsigned long *dst, int nbits);
 extern void bitmap_remap(unsigned long *dst, const unsigned long *src,
                 const unsigned long *old, const unsigned long *new, int bits);
 extern int bitmap_bitremap(int oldbit,
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index bae6fe24d1f9..b24ac56477b4 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -547,6 +547,21 @@ static inline int cpumask_parse_user(const char __user *buf, int len,
 }
 
 /**
+ * cpumask_parselist_user - extract a cpumask from a user string
+ * @buf: the buffer to extract from
+ * @len: the length of the buffer
+ * @dstp: the cpumask to set.
+ *
+ * Returns -errno, or 0 for success.
+ */
+static inline int cpumask_parselist_user(const char __user *buf, int len,
+                                     struct cpumask *dstp)
+{
+        return bitmap_parselist_user(buf, len, cpumask_bits(dstp),
+                                                        nr_cpumask_bits);
+}
+
+/**
  * cpulist_scnprintf - print a cpumask into a string as comma-separated list
  * @buf: the buffer to sprintf into
  * @len: the length of the buffer
diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
index 834899f2500f..64e3df6ab1ef 100644
--- a/kernel/irq/proc.c
+++ b/kernel/irq/proc.c
@@ -19,7 +19,7 @@ static struct proc_dir_entry *root_irq_dir;
 
 #ifdef CONFIG_SMP
 
-static int irq_affinity_proc_show(struct seq_file *m, void *v)
+static int show_irq_affinity(int type, struct seq_file *m, void *v)
 {
         struct irq_desc *desc = irq_to_desc((long)m->private);
         const struct cpumask *mask = desc->irq_data.affinity;
@@ -28,7 +28,10 @@ static int irq_affinity_proc_show(struct seq_file *m, void *v)
         if (irqd_is_setaffinity_pending(&desc->irq_data))
                 mask = desc->pending_mask;
 #endif
-        seq_cpumask(m, mask);
+        if (type)
+                seq_cpumask_list(m, mask);
+        else
+                seq_cpumask(m, mask);
         seq_putc(m, '\n');
         return 0;
 }
@@ -59,7 +62,18 @@ static int irq_affinity_hint_proc_show(struct seq_file *m, void *v)
 #endif
 
 int no_irq_affinity;
-static ssize_t irq_affinity_proc_write(struct file *file,
+static int irq_affinity_proc_show(struct seq_file *m, void *v)
+{
+        return show_irq_affinity(0, m, v);
+}
+
+static int irq_affinity_list_proc_show(struct seq_file *m, void *v)
+{
+        return show_irq_affinity(1, m, v);
+}
+
+
+static ssize_t write_irq_affinity(int type, struct file *file,
                 const char __user *buffer, size_t count, loff_t *pos)
 {
         unsigned int irq = (int)(long)PDE(file->f_path.dentry->d_inode)->data;
@@ -72,7 +86,10 @@ static ssize_t irq_affinity_proc_write(struct file *file,
         if (!alloc_cpumask_var(&new_value, GFP_KERNEL))
                 return -ENOMEM;
 
-        err = cpumask_parse_user(buffer, count, new_value);
+        if (type)
+                err = cpumask_parselist_user(buffer, count, new_value);
+        else
+                err = cpumask_parse_user(buffer, count, new_value);
         if (err)
                 goto free_cpumask;
 
@@ -100,11 +117,28 @@ free_cpumask:
         return err;
 }
 
+static ssize_t irq_affinity_proc_write(struct file *file,
+                const char __user *buffer, size_t count, loff_t *pos)
+{
+        return write_irq_affinity(0, file, buffer, count, pos);
+}
+
+static ssize_t irq_affinity_list_proc_write(struct file *file,
+                const char __user *buffer, size_t count, loff_t *pos)
+{
+        return write_irq_affinity(1, file, buffer, count, pos);
+}
+
 static int irq_affinity_proc_open(struct inode *inode, struct file *file)
 {
         return single_open(file, irq_affinity_proc_show, PDE(inode)->data);
 }
 
+static int irq_affinity_list_proc_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, irq_affinity_list_proc_show, PDE(inode)->data);
+}
+
 static int irq_affinity_hint_proc_open(struct inode *inode, struct file *file)
 {
         return single_open(file, irq_affinity_hint_proc_show, PDE(inode)->data);
@@ -125,6 +159,14 @@ static const struct file_operations irq_affinity_hint_proc_fops = {
         .release        = single_release,
 };
 
+static const struct file_operations irq_affinity_list_proc_fops = {
+        .open           = irq_affinity_list_proc_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+        .write          = irq_affinity_list_proc_write,
+};
+
 static int default_affinity_show(struct seq_file *m, void *v)
 {
         seq_cpumask(m, irq_default_affinity);
@@ -289,6 +331,10 @@ void register_irq_proc(unsigned int irq, struct irq_desc *desc)
         proc_create_data("affinity_hint", 0400, desc->dir,
                          &irq_affinity_hint_proc_fops, (void *)(long)irq);
 
+        /* create /proc/irq/<irq>/smp_affinity_list */
+        proc_create_data("smp_affinity_list", 0600, desc->dir,
+                         &irq_affinity_list_proc_fops, (void *)(long)irq);
+
         proc_create_data("node", 0444, desc->dir,
                          &irq_node_proc_fops, (void *)(long)irq);
 #endif
diff --git a/lib/bitmap.c b/lib/bitmap.c
index 91e0ccfdb424..41baf02924e6 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -571,8 +571,11 @@ int bitmap_scnlistprintf(char *buf, unsigned int buflen,
 EXPORT_SYMBOL(bitmap_scnlistprintf);
 
 /**
- * bitmap_parselist - convert list format ASCII string to bitmap
+ * __bitmap_parselist - convert list format ASCII string to bitmap
  * @bp: read nul-terminated user string from this buffer
+ * @buflen: buffer size in bytes.  If string is smaller than this
+ *    then it must be terminated with a \0.
+ * @is_user: location of buffer, 0 indicates kernel space
  * @maskp: write resulting mask here
  * @nmaskbits: number of bits in mask to be written
  *
@@ -587,20 +590,63 @@ EXPORT_SYMBOL(bitmap_scnlistprintf);
  *    %-EINVAL: invalid character in string
  *    %-ERANGE: bit number specified too large for mask
  */
-int bitmap_parselist(const char *bp, unsigned long *maskp, int nmaskbits)
+static int __bitmap_parselist(const char *buf, unsigned int buflen,
+                int is_user, unsigned long *maskp,
+                int nmaskbits)
 {
         unsigned a, b;
+        int c, old_c, totaldigits;
+        const char __user *ubuf = buf;
+        int exp_digit, in_range;
 
+        totaldigits = c = 0;
         bitmap_zero(maskp, nmaskbits);
         do {
-                if (!isdigit(*bp))
-                        return -EINVAL;
-                b = a = simple_strtoul(bp, (char **)&bp, BASEDEC);
-                if (*bp == '-') {
-                        bp++;
-                        if (!isdigit(*bp))
+                exp_digit = 1;
+                in_range = 0;
+                a = b = 0;
+
+                /* Get the next cpu# or a range of cpu#'s */
+                while (buflen) {
+                        old_c = c;
+                        if (is_user) {
+                                if (__get_user(c, ubuf++))
+                                        return -EFAULT;
+                        } else
+                                c = *buf++;
+                        buflen--;
+                        if (isspace(c))
+                                continue;
+
+                        /*
+                         * If the last character was a space and the current
+                         * character isn't '\0', we've got embedded whitespace.
+                         * This is a no-no, so throw an error.
+                         */
+                        if (totaldigits && c && isspace(old_c))
+                                return -EINVAL;
+
+                        /* A '\0' or a ',' signal the end of a cpu# or range */
+                        if (c == '\0' || c == ',')
+                                break;
+
+                        if (c == '-') {
+                                if (exp_digit || in_range)
+                                        return -EINVAL;
+                                b = 0;
+                                in_range = 1;
+                                exp_digit = 1;
+                                continue;
+                        }
+
+                        if (!isdigit(c))
                                 return -EINVAL;
-                        b = simple_strtoul(bp, (char **)&bp, BASEDEC);
+
+                        b = b * 10 + (c - '0');
+                        if (!in_range)
+                                a = b;
+                        exp_digit = 0;
+                        totaldigits++;
                 }
                 if (!(a <= b))
                         return -EINVAL;
@@ -610,13 +656,52 @@ int bitmap_parselist(const char *bp, unsigned long *maskp, int nmaskbits)
                         set_bit(a, maskp);
                         a++;
                 }
-                if (*bp == ',')
-                        bp++;
-        } while (*bp != '\0' && *bp != '\n');
+        } while (buflen && c == ',');
         return 0;
 }
+
+int bitmap_parselist(const char *bp, unsigned long *maskp, int nmaskbits)
+{
+        char *nl  = strchr(bp, '\n');
+        int len;
+
+        if (nl)
+                len = nl - bp;
+        else
+                len = strlen(bp);
+
+        return __bitmap_parselist(bp, len, 0, maskp, nmaskbits);
+}
 EXPORT_SYMBOL(bitmap_parselist);
 
+
+/**
+ * bitmap_parselist_user()
+ *
+ * @ubuf: pointer to user buffer containing string.
+ * @ulen: buffer size in bytes.  If string is smaller than this
+ *    then it must be terminated with a \0.
+ * @maskp: pointer to bitmap array that will contain result.
+ * @nmaskbits: size of bitmap, in bits.
+ *
+ * Wrapper for bitmap_parselist(), providing it with user buffer.
+ *
+ * We cannot have this as an inline function in bitmap.h because it needs
+ * linux/uaccess.h to get the access_ok() declaration and this causes
+ * cyclic dependencies.
+ */
+int bitmap_parselist_user(const char __user *ubuf,
+                        unsigned int ulen, unsigned long *maskp,
+                        int nmaskbits)
+{
+        if (!access_ok(VERIFY_READ, ubuf, ulen))
+                return -EFAULT;
+        return __bitmap_parselist((const char *)ubuf,
+                                        ulen, 1, maskp, nmaskbits);
+}
+EXPORT_SYMBOL(bitmap_parselist_user);
+
+
 /**
  * bitmap_pos_to_ord - find ordinal of set bit at given position in bitmap
  *      @buf: pointer to a bitmap