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

   1 From ceb70800efa2f4c92f0c89bf472005decd577d65 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 148/196] 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 diff --git a/drivers/video/bcm2708_fb.c b/drivers/video/bcm2708_fb.c
  17 index c10c5ee..4d7d963 100644
  18 --- a/drivers/video/bcm2708_fb.c
  19 +++ b/drivers/video/bcm2708_fb.c
  20 @@ -27,6 +27,7 @@
  21  #include <linux/clk.h>
  22  #include <linux/printk.h>
  23  #include <linux/console.h>
  24 +#include <linux/debugfs.h>
  25
  26  #include <mach/dma.h>
  27  #include <mach/platform.h>
  28 @@ -58,6 +59,12 @@ struct fbinfo_s {
  29         u16 cmap[256];
  30  };
  31
  32 +struct bcm2708_fb_stats {
  33 +       struct debugfs_regset32 regset;
  34 +       u32 dma_copies;
  35 +       u32 dma_irqs;
  36 +};
  37 +
  38  struct bcm2708_fb {
  39         struct fb_info fb;
  40         struct platform_device *dev;
  41 @@ -69,10 +76,51 @@ struct bcm2708_fb {
  42         void __iomem *dma_chan_base;
  43         void *cb_base;          /* DMA control blocks */
  44         dma_addr_t cb_handle;
  45 +       struct dentry *debugfs_dir;
  46 +       struct bcm2708_fb_stats stats;
  47  };
  48
  49  #define to_bcm2708(info)       container_of(info, struct bcm2708_fb, fb)
  50
  51 +static void bcm2708_fb_debugfs_deinit(struct bcm2708_fb *fb)
  52 +{
  53 +       debugfs_remove_recursive(fb->debugfs_dir);
  54 +       fb->debugfs_dir = NULL;
  55 +}
  56 +
  57 +static int bcm2708_fb_debugfs_init(struct bcm2708_fb *fb)
  58 +{
  59 +       static struct debugfs_reg32 stats_registers[] = {
  60 +               {
  61 +                       "dma_copies",
  62 +                       offsetof(struct bcm2708_fb_stats, dma_copies)
  63 +               },
  64 +       };
  65 +
  66 +       fb->debugfs_dir = debugfs_create_dir(DRIVER_NAME, NULL);
  67 +       if (!fb->debugfs_dir) {
  68 +               pr_warn("%s: could not create debugfs entry\n",
  69 +                       __func__);
  70 +               return -EFAULT;
  71 +       }
  72 +
  73 +       fb->stats.regset.regs = stats_registers;
  74 +       fb->stats.regset.nregs = ARRAY_SIZE(stats_registers);
  75 +       fb->stats.regset.base = &fb->stats;
  76 +
  77 +       if (!debugfs_create_regset32(
  78 +               "stats", 0444, fb->debugfs_dir, &fb->stats.regset)) {
  79 +               pr_warn("%s: could not create statistics registers\n",
  80 +                       __func__);
  81 +               goto fail;
  82 +       }
  83 +       return 0;
  84 +
  85 +fail:
  86 +       bcm2708_fb_debugfs_deinit(fb);
  87 +       return -EFAULT;
  88 +}
  89 +
  90  static int bcm2708_fb_set_bitfields(struct fb_var_screeninfo *var)
  91  {
  92         int ret = 0;
  93 @@ -443,8 +491,10 @@ static void bcm2708_fb_copyarea(struct fb_info *info,
  94         /* end of dma control blocks chain */
  95         cb->next = 0;
  96
  97 +
  98         bcm_dma_start(fb->dma_chan_base, fb->cb_handle);
  99         bcm_dma_wait_idle(fb->dma_chan_base);
 100 +       fb->stats.dma_copies++;
 101  }
 102
 103  static void bcm2708_fb_imageblit(struct fb_info *info,
 104 @@ -552,6 +602,9 @@ static int bcm2708_fb_probe(struct platform_device *dev)
 105         }
 106         memset(fb, 0, sizeof(struct bcm2708_fb));
 107
 108 +
 109 +       bcm2708_fb_debugfs_init(fb);
 110 +
 111         fb->cb_base = dma_alloc_writecombine(&dev->dev, SZ_64K,
 112                                              &fb->cb_handle, GFP_KERNEL);
 113         if (!fb->cb_base) {
 114 @@ -607,6 +660,8 @@ static int bcm2708_fb_remove(struct platform_device *dev)
 115
 116         dma_free_coherent(NULL, PAGE_ALIGN(sizeof(*fb->info)), (void *)fb->info,
 117                           fb->dma);
 118 +       bcm2708_fb_debugfs_deinit(fb);
 119 +
 120         kfree(fb);
 121
 122         return 0;
 123 --
 124 1.9.1
 125