121 lines
3.0 KiB
Diff
121 lines
3.0 KiB
Diff
From 2807aef659483de0d569b2c01e2b68be046496d3 Mon Sep 17 00:00:00 2001
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From: Luke Diamand <luked@broadcom.com>
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Date: Tue, 31 Dec 2013 23:07:36 +0000
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Subject: [PATCH 148/174] bcm2708_fb: report number of dma copies
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Add a counter (exported via debugfs) reporting the
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number of dma copies that the framebuffer driver
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has done, in order to help evaluate different
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optimization strategies.
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Signed-off-by: Luke Diamand <luked@broadcom.com>
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---
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drivers/video/bcm2708_fb.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++
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1 file changed, 55 insertions(+)
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--- a/drivers/video/bcm2708_fb.c
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+++ b/drivers/video/bcm2708_fb.c
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@@ -27,6 +27,7 @@
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#include <linux/clk.h>
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#include <linux/printk.h>
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#include <linux/console.h>
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+#include <linux/debugfs.h>
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#include <mach/dma.h>
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#include <mach/platform.h>
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@@ -58,6 +59,12 @@ struct fbinfo_s {
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u16 cmap[256];
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};
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+struct bcm2708_fb_stats {
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+ struct debugfs_regset32 regset;
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+ u32 dma_copies;
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+ u32 dma_irqs;
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+};
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+
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struct bcm2708_fb {
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struct fb_info fb;
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struct platform_device *dev;
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@@ -69,10 +76,51 @@ struct bcm2708_fb {
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void __iomem *dma_chan_base;
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void *cb_base; /* DMA control blocks */
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dma_addr_t cb_handle;
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+ struct dentry *debugfs_dir;
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+ struct bcm2708_fb_stats stats;
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};
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#define to_bcm2708(info) container_of(info, struct bcm2708_fb, fb)
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+static void bcm2708_fb_debugfs_deinit(struct bcm2708_fb *fb)
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+{
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+ debugfs_remove_recursive(fb->debugfs_dir);
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+ fb->debugfs_dir = NULL;
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+}
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+
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+static int bcm2708_fb_debugfs_init(struct bcm2708_fb *fb)
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+{
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+ static struct debugfs_reg32 stats_registers[] = {
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+ {
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+ "dma_copies",
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+ offsetof(struct bcm2708_fb_stats, dma_copies)
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+ },
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+ };
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+
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+ fb->debugfs_dir = debugfs_create_dir(DRIVER_NAME, NULL);
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+ if (!fb->debugfs_dir) {
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+ pr_warn("%s: could not create debugfs entry\n",
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+ __func__);
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+ return -EFAULT;
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+ }
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+
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+ fb->stats.regset.regs = stats_registers;
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+ fb->stats.regset.nregs = ARRAY_SIZE(stats_registers);
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+ fb->stats.regset.base = &fb->stats;
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+
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+ if (!debugfs_create_regset32(
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+ "stats", 0444, fb->debugfs_dir, &fb->stats.regset)) {
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+ pr_warn("%s: could not create statistics registers\n",
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+ __func__);
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+ goto fail;
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+ }
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+ return 0;
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+
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+fail:
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+ bcm2708_fb_debugfs_deinit(fb);
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+ return -EFAULT;
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+}
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+
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static int bcm2708_fb_set_bitfields(struct fb_var_screeninfo *var)
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{
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int ret = 0;
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@@ -443,8 +491,10 @@ static void bcm2708_fb_copyarea(struct f
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/* end of dma control blocks chain */
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cb->next = 0;
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+
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bcm_dma_start(fb->dma_chan_base, fb->cb_handle);
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bcm_dma_wait_idle(fb->dma_chan_base);
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+ fb->stats.dma_copies++;
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}
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static void bcm2708_fb_imageblit(struct fb_info *info,
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@@ -552,6 +602,9 @@ static int bcm2708_fb_probe(struct platf
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}
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memset(fb, 0, sizeof(struct bcm2708_fb));
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+
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+ bcm2708_fb_debugfs_init(fb);
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+
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fb->cb_base = dma_alloc_writecombine(&dev->dev, SZ_64K,
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&fb->cb_handle, GFP_KERNEL);
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if (!fb->cb_base) {
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@@ -607,6 +660,8 @@ static int bcm2708_fb_remove(struct plat
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dma_free_coherent(NULL, PAGE_ALIGN(sizeof(*fb->info)), (void *)fb->info,
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fb->dma);
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+ bcm2708_fb_debugfs_deinit(fb);
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+
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kfree(fb);
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return 0;
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