diff options
Diffstat (limited to 'target/linux/brcm2708/patches-3.10/0148-bcm2708_fb-report-number-of-dma-copies.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-3.10/0148-bcm2708_fb-report-number-of-dma-copies.patch | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-3.10/0148-bcm2708_fb-report-number-of-dma-copies.patch b/target/linux/brcm2708/patches-3.10/0148-bcm2708_fb-report-number-of-dma-copies.patch new file mode 100644 index 0000000000..cd09a729b2 --- /dev/null +++ b/target/linux/brcm2708/patches-3.10/0148-bcm2708_fb-report-number-of-dma-copies.patch @@ -0,0 +1,120 @@ +From 2807aef659483de0d569b2c01e2b68be046496d3 Mon Sep 17 00:00:00 2001 +From: Luke Diamand <luked@broadcom.com> +Date: Tue, 31 Dec 2013 23:07:36 +0000 +Subject: [PATCH 148/174] bcm2708_fb: report number of dma copies + +Add a counter (exported via debugfs) reporting the +number of dma copies that the framebuffer driver +has done, in order to help evaluate different +optimization strategies. + +Signed-off-by: Luke Diamand <luked@broadcom.com> +--- + drivers/video/bcm2708_fb.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++ + 1 file changed, 55 insertions(+) + +--- a/drivers/video/bcm2708_fb.c ++++ b/drivers/video/bcm2708_fb.c +@@ -27,6 +27,7 @@ + #include <linux/clk.h> + #include <linux/printk.h> + #include <linux/console.h> ++#include <linux/debugfs.h> + + #include <mach/dma.h> + #include <mach/platform.h> +@@ -58,6 +59,12 @@ struct fbinfo_s { + u16 cmap[256]; + }; + ++struct bcm2708_fb_stats { ++ struct debugfs_regset32 regset; ++ u32 dma_copies; ++ u32 dma_irqs; ++}; ++ + struct bcm2708_fb { + struct fb_info fb; + struct platform_device *dev; +@@ -69,10 +76,51 @@ struct bcm2708_fb { + void __iomem *dma_chan_base; + void *cb_base; /* DMA control blocks */ + dma_addr_t cb_handle; ++ struct dentry *debugfs_dir; ++ struct bcm2708_fb_stats stats; + }; + + #define to_bcm2708(info) container_of(info, struct bcm2708_fb, fb) + ++static void bcm2708_fb_debugfs_deinit(struct bcm2708_fb *fb) ++{ ++ debugfs_remove_recursive(fb->debugfs_dir); ++ fb->debugfs_dir = NULL; ++} ++ ++static int bcm2708_fb_debugfs_init(struct bcm2708_fb *fb) ++{ ++ static struct debugfs_reg32 stats_registers[] = { ++ { ++ "dma_copies", ++ offsetof(struct bcm2708_fb_stats, dma_copies) ++ }, ++ }; ++ ++ fb->debugfs_dir = debugfs_create_dir(DRIVER_NAME, NULL); ++ if (!fb->debugfs_dir) { ++ pr_warn("%s: could not create debugfs entry\n", ++ __func__); ++ return -EFAULT; ++ } ++ ++ fb->stats.regset.regs = stats_registers; ++ fb->stats.regset.nregs = ARRAY_SIZE(stats_registers); ++ fb->stats.regset.base = &fb->stats; ++ ++ if (!debugfs_create_regset32( ++ "stats", 0444, fb->debugfs_dir, &fb->stats.regset)) { ++ pr_warn("%s: could not create statistics registers\n", ++ __func__); ++ goto fail; ++ } ++ return 0; ++ ++fail: ++ bcm2708_fb_debugfs_deinit(fb); ++ return -EFAULT; ++} ++ + static int bcm2708_fb_set_bitfields(struct fb_var_screeninfo *var) + { + int ret = 0; +@@ -443,8 +491,10 @@ static void bcm2708_fb_copyarea(struct f + /* end of dma control blocks chain */ + cb->next = 0; + ++ + bcm_dma_start(fb->dma_chan_base, fb->cb_handle); + bcm_dma_wait_idle(fb->dma_chan_base); ++ fb->stats.dma_copies++; + } + + static void bcm2708_fb_imageblit(struct fb_info *info, +@@ -552,6 +602,9 @@ static int bcm2708_fb_probe(struct platf + } + memset(fb, 0, sizeof(struct bcm2708_fb)); + ++ ++ bcm2708_fb_debugfs_init(fb); ++ + fb->cb_base = dma_alloc_writecombine(&dev->dev, SZ_64K, + &fb->cb_handle, GFP_KERNEL); + if (!fb->cb_base) { +@@ -607,6 +660,8 @@ static int bcm2708_fb_remove(struct plat + + dma_free_coherent(NULL, PAGE_ALIGN(sizeof(*fb->info)), (void *)fb->info, + fb->dma); ++ bcm2708_fb_debugfs_deinit(fb); ++ + kfree(fb); + + return 0; |