target/linux/brcm2708/patches-3.10/0148-bcm2708_fb-report-number-of-dma-copies.patch

   1 From 2807aef659483de0d569b2c01e2b68be046496d3 Mon Sep 17 00:00:00 2001
   2 From: Luke Diamand <luked@broadcom.com>
   3 Date: Tue, 31 Dec 2013 23:07:36 +0000
   4 Subject: [PATCH 148/174] bcm2708_fb: report number of dma copies
   5
   6 Add a counter (exported via debugfs) reporting the
   7 number of dma copies that the framebuffer driver
   8 has done, in order to help evaluate different
   9 optimization strategies.
  10
  11 Signed-off-by: Luke Diamand <luked@broadcom.com>
  12 ---
  13  drivers/video/bcm2708_fb.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++
  14  1 file changed, 55 insertions(+)
  15
  16 --- a/drivers/video/bcm2708_fb.c
  17 +++ b/drivers/video/bcm2708_fb.c
  18 @@ -27,6 +27,7 @@
  19  #include <linux/clk.h>
  20  #include <linux/printk.h>
  21  #include <linux/console.h>
  22 +#include <linux/debugfs.h>
  23
  24  #include <mach/dma.h>
  25  #include <mach/platform.h>
  26 @@ -58,6 +59,12 @@ struct fbinfo_s {
  27         u16 cmap[256];
  28  };
  29
  30 +struct bcm2708_fb_stats {
  31 +       struct debugfs_regset32 regset;
  32 +       u32 dma_copies;
  33 +       u32 dma_irqs;
  34 +};
  35 +
  36  struct bcm2708_fb {
  37         struct fb_info fb;
  38         struct platform_device *dev;
  39 @@ -69,10 +76,51 @@ struct bcm2708_fb {
  40         void __iomem *dma_chan_base;
  41         void *cb_base;          /* DMA control blocks */
  42         dma_addr_t cb_handle;
  43 +       struct dentry *debugfs_dir;
  44 +       struct bcm2708_fb_stats stats;
  45  };
  46
  47  #define to_bcm2708(info)       container_of(info, struct bcm2708_fb, fb)
  48
  49 +static void bcm2708_fb_debugfs_deinit(struct bcm2708_fb *fb)
  50 +{
  51 +       debugfs_remove_recursive(fb->debugfs_dir);
  52 +       fb->debugfs_dir = NULL;
  53 +}
  54 +
  55 +static int bcm2708_fb_debugfs_init(struct bcm2708_fb *fb)
  56 +{
  57 +       static struct debugfs_reg32 stats_registers[] = {
  58 +               {
  59 +                       "dma_copies",
  60 +                       offsetof(struct bcm2708_fb_stats, dma_copies)
  61 +               },
  62 +       };
  63 +
  64 +       fb->debugfs_dir = debugfs_create_dir(DRIVER_NAME, NULL);
  65 +       if (!fb->debugfs_dir) {
  66 +               pr_warn("%s: could not create debugfs entry\n",
  67 +                       __func__);
  68 +               return -EFAULT;
  69 +       }
  70 +
  71 +       fb->stats.regset.regs = stats_registers;
  72 +       fb->stats.regset.nregs = ARRAY_SIZE(stats_registers);
  73 +       fb->stats.regset.base = &fb->stats;
  74 +
  75 +       if (!debugfs_create_regset32(
  76 +               "stats", 0444, fb->debugfs_dir, &fb->stats.regset)) {
  77 +               pr_warn("%s: could not create statistics registers\n",
  78 +                       __func__);
  79 +               goto fail;
  80 +       }
  81 +       return 0;
  82 +
  83 +fail:
  84 +       bcm2708_fb_debugfs_deinit(fb);
  85 +       return -EFAULT;
  86 +}
  87 +
  88  static int bcm2708_fb_set_bitfields(struct fb_var_screeninfo *var)
  89  {
  90         int ret = 0;
  91 @@ -443,8 +491,10 @@ static void bcm2708_fb_copyarea(struct f
  92         /* end of dma control blocks chain */
  93         cb->next = 0;
  94
  95 +
  96         bcm_dma_start(fb->dma_chan_base, fb->cb_handle);
  97         bcm_dma_wait_idle(fb->dma_chan_base);
  98 +       fb->stats.dma_copies++;
  99  }
 100
 101  static void bcm2708_fb_imageblit(struct fb_info *info,
 102 @@ -552,6 +602,9 @@ static int bcm2708_fb_probe(struct platf
 103         }
 104         memset(fb, 0, sizeof(struct bcm2708_fb));
 105
 106 +
 107 +       bcm2708_fb_debugfs_init(fb);
 108 +
 109         fb->cb_base = dma_alloc_writecombine(&dev->dev, SZ_64K,
 110                                              &fb->cb_handle, GFP_KERNEL);
 111         if (!fb->cb_base) {
 112 @@ -607,6 +660,8 @@ static int bcm2708_fb_remove(struct plat
 113
 114         dma_free_coherent(NULL, PAGE_ALIGN(sizeof(*fb->info)), (void *)fb->info,
 115                           fb->dma);
 116 +       bcm2708_fb_debugfs_deinit(fb);
 117 +
 118         kfree(fb);
 119
 120         return 0;