Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758193AbbBFWgE (ORCPT ); Fri, 6 Feb 2015 17:36:04 -0500 Received: from mailgw1.uni-kl.de ([131.246.120.220]:50101 "EHLO mailgw1.uni-kl.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752156AbbBFWgA (ORCPT ); Fri, 6 Feb 2015 17:36:00 -0500 X-Greylist: delayed 584 seconds by postgrey-1.27 at vger.kernel.org; Fri, 06 Feb 2015 17:35:48 EST From: niederp@physik.uni-kl.de To: linux-fbdev@vger.kernel.org, plagnioj@jcrosoft.com, tomi.valkeinen@ti.com, maxime.ripard@free-electrons.com Cc: linux-kernel@vger.kernel.org, =?UTF-8?q?Thomas=20Niederpr=C3=BCm?= Subject: [PATCH 4/8] fbdev: ssd1307fb: Use vmalloc to allocate video memory. Date: Fri, 6 Feb 2015 23:28:10 +0100 Message-Id: <1423261694-5939-5-git-send-email-niederp@physik.uni-kl.de> X-Mailer: git-send-email 2.1.1 In-Reply-To: <1423261694-5939-1-git-send-email-niederp@physik.uni-kl.de> References: <1423261694-5939-1-git-send-email-niederp@physik.uni-kl.de> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3121 Lines: 106 From: Thomas Niederprüm It makes sense to use vmalloc to allocate the video buffer since it has to be page aligned memory for using it with mmap. Also deffered io seems buggy in combination with kmalloc'ed memory (crash on unloading the module). Signed-off-by: Thomas Niederprüm --- drivers/video/fbdev/ssd1307fb.c | 43 +++++++++++++++++++++++++++++++++++++++-- 1 file changed, 41 insertions(+), 2 deletions(-) diff --git a/drivers/video/fbdev/ssd1307fb.c b/drivers/video/fbdev/ssd1307fb.c index 01cfb46..945ded9 100644 --- a/drivers/video/fbdev/ssd1307fb.c +++ b/drivers/video/fbdev/ssd1307fb.c @@ -11,6 +11,7 @@ #include #include #include +#include #include #include #include @@ -93,6 +94,43 @@ static struct fb_var_screeninfo ssd1307fb_var = { .bits_per_pixel = 1, }; +static void *rvmalloc(unsigned long size) +{ + void *mem; + unsigned long adr; + + size = PAGE_ALIGN(size); + mem = vmalloc_32(size); + if (!mem) + return NULL; + + memset(mem, 0, size); /* Clear the ram out, no junk to the user */ + adr = (unsigned long) mem; + while (size > 0) { + SetPageReserved(vmalloc_to_page((void *)adr)); + adr += PAGE_SIZE; + size -= PAGE_SIZE; + } + + return mem; +} + +static void rvfree(void *mem, unsigned long size) +{ + unsigned long adr; + + if (!mem) + return; + + adr = (unsigned long) mem; + while ((long) size > 0) { + ClearPageReserved(vmalloc_to_page((void *)adr)); + adr += PAGE_SIZE; + size -= PAGE_SIZE; + } + vfree(mem); +} + static struct ssd1307fb_array *ssd1307fb_alloc_array(u32 len, u8 type) { struct ssd1307fb_array *array; @@ -538,13 +576,13 @@ static int ssd1307fb_probe(struct i2c_client *client, if (of_property_read_u32(node, "solomon,vcomh", &par->vcomh)) par->vcomh = par->device_info->default_vcomh; - vmem = devm_kzalloc(&client->dev, vmem_size, GFP_KERNEL); if (of_property_read_u32(node, "solomon,dclk-div", &par->dclk_div)) par->dclk_div = par->device_info->default_dclk_div; if (of_property_read_u32(node, "solomon,dclk-frq", &par->dclk_frq)) par->dclk_frq = par->device_info->default_dclk_frq; + vmem = rvmalloc(vmem_size); if (!vmem) { dev_err(&client->dev, "Couldn't allocate graphical memory.\n"); ret = -ENOMEM; @@ -570,7 +608,7 @@ static int ssd1307fb_probe(struct i2c_client *client, info->var.blue.offset = 0; info->screen_base = (u8 __force __iomem *)vmem; - info->fix.smem_start = (unsigned long)vmem; + info->fix.smem_start = __pa(vmem); info->fix.smem_len = vmem_size; fb_deferred_io_init(info); @@ -614,6 +652,7 @@ panel_init_error: }; reset_oled_error: fb_deferred_io_cleanup(info); + rvfree(vmem, vmem_size); fb_alloc_error: framebuffer_release(info); return ret; -- 2.1.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/