gpu: nvgpu: move debugfs code to linux module

Since all debugfs code is Linux specific, remove
it from common code and move it to Linux module

Debugfs code is now divided into below
module specific files :

common/linux/debug.c
common/linux/debug_cde.c
common/linux/debug_ce.c
common/linux/debug_fifo.c
common/linux/debug_gr.c
common/linux/debug_mm.c
common/linux/debug_allocator.c
common/linux/debug_kmem.c
common/linux/debug_pmu.c
common/linux/debug_sched.c

Add corresponding header files for above modules too
And compile all of above files only if CONFIG_DEBUG_FS is set

Some more details of the changes made

- Move and rename gk20a/debug_gk20a.c to common/linux/debug.c
- Move and rename gk20a/debug_gk20a.h to include/nvgpu/debug.h

- Remove gm20b/debug_gm20b.c and gm20b/debug_gm20b.h and call
  gk20a_init_debug_ops() directly from gm20b_init_hal()

- Update all debug APIs to receive struct gk20a as parameter
  instead of receiving struct device pointer
- Update API gk20a_dmabuf_get_state() to receive struct gk20a
  pointer instead of struct device

- Include <nvgpu/debug.h> explicitly in all files where debug
  operations are used
- Remove "gk20a/platform_gk20a.h" include from HAL files
  which no longer need this include

- Add new API gk20a_debug_deinit() to deinitialize debugfs
  and call it from gk20a_remove()
- Move API gk20a_debug_dump_all_channel_status_ramfc() to
  gk20a/fifo_gk20a.c

Jira NVGPU-62

Change-Id: I076975d3d7f669bdbe9212fa33d98529377feeb6
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/1488902
Reviewed-by: svccoveritychecker <svccoveritychecker@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>

1 files changed, 315 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/common/linux/debug_kmem.c b/drivers/gpu/nvgpu/common/linux/debug_kmem.c
new file mode 100644
index 00000000..2ee542a8
--- /dev/null
+++ b/drivers/gpu/nvgpu/common/linux/debug_kmem.c
@@ -0,0 +1,315 @@
+/*
+ * Copyright (C) 2017 NVIDIA Corporation.  All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include "debug_kmem.h"
+#include "kmem_priv.h"
+#include "gk20a/platform_gk20a.h"
+
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+
+#ifdef CONFIG_NVGPU_TRACK_MEM_USAGE
+/**
+ * to_human_readable_bytes - Determine  suffix for passed size.
+ *
+ * @bytes - Number of bytes to generate a suffix for.
+ * @hr_bytes [out] - The human readable number of bytes.
+ * @hr_suffix [out] - The suffix for the HR number of bytes.
+ *
+ * Computes a human readable decomposition of the passed number of bytes. The
+ * suffix for the bytes is passed back through the @hr_suffix pointer. The right
+ * number of bytes is then passed back in @hr_bytes. This returns the following
+ * ranges:
+ *
+ *   0 - 1023 B
+ *   1 - 1023 KB
+ *   1 - 1023 MB
+ *   1 - 1023 GB
+ *   1 - 1023 TB
+ *   1 - ...  PB
+ */
+static void __to_human_readable_bytes(u64 bytes, u64 *hr_bytes,
+                                      const char **hr_suffix)
+{
+        static const char *suffixes[] =
+                { "B", "KB", "MB", "GB", "TB", "PB" };
+
+        u64 suffix_ind = 0;
+
+        while (suffix_ind < ARRAY_SIZE(suffixes) && bytes >= 1024) {
+                bytes >>= 10;
+                suffix_ind++;
+        }
+
+        /*
+         * Handle case where bytes > 1023PB.
+         */
+        suffix_ind = suffix_ind < ARRAY_SIZE(suffixes) ?
+                suffix_ind : ARRAY_SIZE(suffixes) - 1;
+
+        *hr_bytes = bytes;
+        *hr_suffix = suffixes[suffix_ind];
+}
+
+/**
+ * print_hr_bytes - Print human readable bytes
+ *
+ * @s - A seq_file to print to. May be NULL.
+ * @msg - A message to print before the bytes.
+ * @bytes - Number of bytes.
+ *
+ * Print @msg followed by the human readable decomposition of the passed number
+ * of bytes.
+ *
+ * If @s is NULL then this prints will be made to the kernel log.
+ */
+static void print_hr_bytes(struct seq_file *s, const char *msg, u64 bytes)
+{
+        u64 hr_bytes;
+        const char *hr_suffix;
+
+        __to_human_readable_bytes(bytes, &hr_bytes, &hr_suffix);
+        __pstat(s, "%s%lld %s\n", msg, hr_bytes, hr_suffix);
+}
+
+/**
+ * print_histogram - Build a histogram of the memory usage.
+ *
+ * @tracker The tracking to pull data from.
+ * @s       A seq_file to dump info into.
+ */
+static void print_histogram(struct nvgpu_mem_alloc_tracker *tracker,
+                            struct seq_file *s)
+{
+        int i;
+        u64 pot_min, pot_max;
+        u64 nr_buckets;
+        unsigned int *buckets;
+        unsigned int total_allocs;
+        struct nvgpu_rbtree_node *node;
+        static const char histogram_line[] =
+                "++++++++++++++++++++++++++++++++++++++++";
+
+        /*
+         * pot_min is essentially a round down to the nearest power of 2. This
+         * is the start of the histogram. pot_max is just a round up to the
+         * nearest power of two. Each histogram bucket is one power of two so
+         * the histogram buckets are exponential.
+         */
+        pot_min = (u64)rounddown_pow_of_two(tracker->min_alloc);
+        pot_max = (u64)roundup_pow_of_two(tracker->max_alloc);
+
+        nr_buckets = __ffs(pot_max) - __ffs(pot_min);
+
+        buckets = kzalloc(sizeof(*buckets) * nr_buckets, GFP_KERNEL);
+        if (!buckets) {
+                __pstat(s, "OOM: could not allocate bucket storage!?\n");
+                return;
+        }
+
+        /*
+         * Iterate across all of the allocs and determine what bucket they
+         * should go in. Round the size down to the nearest power of two to
+         * find the right bucket.
+         */
+        nvgpu_rbtree_enum_start(0, &node, tracker->allocs);
+        while (node) {
+                int b;
+                u64 bucket_min;
+                struct nvgpu_mem_alloc *alloc =
+                        nvgpu_mem_alloc_from_rbtree_node(node);
+
+                bucket_min = (u64)rounddown_pow_of_two(alloc->size);
+                if (bucket_min < tracker->min_alloc)
+                        bucket_min = tracker->min_alloc;
+
+                b = __ffs(bucket_min) - __ffs(pot_min);
+
+                /*
+                 * Handle the one case were there's an alloc exactly as big as
+                 * the maximum bucket size of the largest bucket. Most of the
+                 * buckets have an inclusive minimum and exclusive maximum. But
+                 * the largest bucket needs to have an _inclusive_ maximum as
+                 * well.
+                 */
+                if (b == (int)nr_buckets)
+                        b--;
+
+                buckets[b]++;
+
+                nvgpu_rbtree_enum_next(&node, node);
+        }
+
+        total_allocs = 0;
+        for (i = 0; i < (int)nr_buckets; i++)
+                total_allocs += buckets[i];
+
+        __pstat(s, "Alloc histogram:\n");
+
+        /*
+         * Actually compute the histogram lines.
+         */
+        for (i = 0; i < (int)nr_buckets; i++) {
+                char this_line[sizeof(histogram_line) + 1];
+                u64 line_length;
+                u64 hr_bytes;
+                const char *hr_suffix;
+
+                memset(this_line, 0, sizeof(this_line));
+
+                /*
+                 * Compute the normalized line length. Cant use floating point
+                 * so we will just multiply everything by 1000 and use fixed
+                 * point.
+                 */
+                line_length = (1000 * buckets[i]) / total_allocs;
+                line_length *= sizeof(histogram_line);
+                line_length /= 1000;
+
+                memset(this_line, '+', line_length);
+
+                __to_human_readable_bytes(1 << (__ffs(pot_min) + i),
+                                          &hr_bytes, &hr_suffix);
+                __pstat(s, "  [%-4lld %-4lld] %-2s %5u | %s\n",
+                        hr_bytes, hr_bytes << 1,
+                        hr_suffix, buckets[i], this_line);
+        }
+}
+
+/**
+ * nvgpu_kmem_print_stats - Print kmem tracking stats.
+ *
+ * @tracker The tracking to pull data from.
+ * @s       A seq_file to dump info into.
+ *
+ * Print stats from a tracker. If @s is non-null then seq_printf() will be
+ * used with @s. Otherwise the stats are pr_info()ed.
+ */
+void nvgpu_kmem_print_stats(struct nvgpu_mem_alloc_tracker *tracker,
+                            struct seq_file *s)
+{
+        nvgpu_lock_tracker(tracker);
+
+        __pstat(s, "Mem tracker: %s\n\n", tracker->name);
+
+        __pstat(s, "Basic Stats:\n");
+        __pstat(s,        "  Number of allocs        %lld\n",
+                tracker->nr_allocs);
+        __pstat(s,        "  Number of frees         %lld\n",
+                tracker->nr_frees);
+        print_hr_bytes(s, "  Smallest alloc          ", tracker->min_alloc);
+        print_hr_bytes(s, "  Largest alloc           ", tracker->max_alloc);
+        print_hr_bytes(s, "  Bytes allocated         ", tracker->bytes_alloced);
+        print_hr_bytes(s, "  Bytes freed             ", tracker->bytes_freed);
+        print_hr_bytes(s, "  Bytes allocated (real)  ",
+                       tracker->bytes_alloced_real);
+        print_hr_bytes(s, "  Bytes freed (real)      ",
+                       tracker->bytes_freed_real);
+        __pstat(s, "\n");
+
+        print_histogram(tracker, s);
+
+        nvgpu_unlock_tracker(tracker);
+}
+
+static int __kmem_tracking_show(struct seq_file *s, void *unused)
+{
+        struct nvgpu_mem_alloc_tracker *tracker = s->private;
+
+        nvgpu_kmem_print_stats(tracker, s);
+
+        return 0;
+}
+
+static int __kmem_tracking_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, __kmem_tracking_show, inode->i_private);
+}
+
+static const struct file_operations __kmem_tracking_fops = {
+        .open = __kmem_tracking_open,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = single_release,
+};
+
+static int __kmem_traces_dump_tracker(struct gk20a *g,
+                                      struct nvgpu_mem_alloc_tracker *tracker,
+                                      struct seq_file *s)
+{
+        struct nvgpu_rbtree_node *node;
+
+        nvgpu_rbtree_enum_start(0, &node, tracker->allocs);
+        while (node) {
+                struct nvgpu_mem_alloc *alloc =
+                        nvgpu_mem_alloc_from_rbtree_node(node);
+
+                kmem_print_mem_alloc(g, alloc, s);
+
+                nvgpu_rbtree_enum_next(&node, node);
+        }
+
+        return 0;
+}
+
+static int __kmem_traces_show(struct seq_file *s, void *unused)
+{
+        struct gk20a *g = s->private;
+
+        nvgpu_lock_tracker(g->vmallocs);
+        seq_puts(s, "Oustanding vmallocs:\n");
+        __kmem_traces_dump_tracker(g, g->vmallocs, s);
+        seq_puts(s, "\n");
+        nvgpu_unlock_tracker(g->vmallocs);
+
+        nvgpu_lock_tracker(g->kmallocs);
+        seq_puts(s, "Oustanding kmallocs:\n");
+        __kmem_traces_dump_tracker(g, g->kmallocs, s);
+        nvgpu_unlock_tracker(g->kmallocs);
+
+        return 0;
+}
+
+static int __kmem_traces_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, __kmem_traces_show, inode->i_private);
+}
+
+static const struct file_operations __kmem_traces_fops = {
+        .open = __kmem_traces_open,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = single_release,
+};
+
+void nvgpu_kmem_debugfs_init(struct gk20a *g)
+{
+        struct gk20a_platform *platform = dev_get_drvdata(g->dev);
+        struct dentry *node;
+
+        g->debugfs_kmem = debugfs_create_dir("kmem_tracking", platform->debugfs);
+        if (IS_ERR_OR_NULL(g->debugfs_kmem))
+                return;
+
+        node = debugfs_create_file(g->vmallocs->name, S_IRUGO,
+                                   g->debugfs_kmem,
+                                   g->vmallocs, &__kmem_tracking_fops);
+        node = debugfs_create_file(g->kmallocs->name, S_IRUGO,
+                                   g->debugfs_kmem,
+                                   g->kmallocs, &__kmem_tracking_fops);
+        node = debugfs_create_file("traces", S_IRUGO,
+                                   g->debugfs_kmem,
+                                   g, &__kmem_traces_fops);
+}
+#endif