From 05314098349747f8adbf6c93b43f3b2d013222be Mon Sep 17 00:00:00 2001 From: "Luis R. Rodriguez" Date: Fri, 29 May 2015 15:07:16 -0700 Subject: [PATCH] video: fbdev: gbefb: use arch_phys_wc_add() and devm_ioremap_wc() Convert the driver from using the x86 specific MTRR code to the architecture agnostic arch_phys_wc_add(). arch_phys_wc_add() will avoid MTRR if write-combining is available, in order to take advantage of that also ensure the ioremap'd area is requested as write-combining. There are a few motivations for this: a) Take advantage of PAT when available b) Help bury MTRR code away, MTRR is architecture specific and on x86 its replaced by PAT c) Help with the goal of eventually using _PAGE_CACHE_UC over _PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (see commit de33c442e titled "x86 PAT: fix performance drop for glx, use UC minus for ioremap(), ioremap_nocache() and pci_mmap_page_range()") The conversion done is expressed by the following Coccinelle SmPL patch, it additionally required manual intervention to address all the #ifdery and removal of redundant things which arch_phys_wc_add() already addresses such as verbose message about when MTRR fails and doing nothing when we didn't get an MTRR. @ mtrr_found @ expression index, base, size; @@ -index = mtrr_add(base, size, MTRR_TYPE_WRCOMB, 1); +index = arch_phys_wc_add(base, size); @ mtrr_rm depends on mtrr_found @ expression mtrr_found.index, mtrr_found.base, mtrr_found.size; @@ -mtrr_del(index, base, size); +arch_phys_wc_del(index); @ mtrr_rm_zero_arg depends on mtrr_found @ expression mtrr_found.index; @@ -mtrr_del(index, 0, 0); +arch_phys_wc_del(index); @ mtrr_rm_fb_info depends on mtrr_found @ struct fb_info *info; expression mtrr_found.index; @@ -mtrr_del(index, info->fix.smem_start, info->fix.smem_len); +arch_phys_wc_del(index); @ ioremap_replace_nocache depends on mtrr_found @ struct fb_info *info; expression base, size; @@ -info->screen_base = ioremap_nocache(base, size); +info->screen_base = ioremap_wc(base, size); @ ioremap_replace_default depends on mtrr_found @ struct fb_info *info; expression base, size; @@ -info->screen_base = ioremap(base, size); +info->screen_base = ioremap_wc(base, size); Generated-by: Coccinelle SmPL Cc: Thomas Gleixner Cc: Juergen Gross Cc: Jingoo Han Cc: Daniel Vetter Cc: Masanari Iida Cc: Suresh Siddha Cc: Ingo Molnar Cc: Andy Lutomirski Cc: Dave Airlie Cc: Antonino Daplas Cc: Jean-Christophe Plagniol-Villard Cc: Tomi Valkeinen Cc: linux-fbdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Luis R. Rodriguez Signed-off-by: Tomi Valkeinen --- drivers/video/fbdev/gbefb.c | 30 +++++++++--------------------- 1 file changed, 9 insertions(+), 21 deletions(-) diff --git a/drivers/video/fbdev/gbefb.c b/drivers/video/fbdev/gbefb.c index 4e54faa06..b63d55f4 100644 --- a/drivers/video/fbdev/gbefb.c +++ b/drivers/video/fbdev/gbefb.c @@ -22,9 +22,6 @@ #include #include -#ifdef CONFIG_X86 -#include -#endif #ifdef CONFIG_MIPS #include #endif @@ -1176,8 +1173,8 @@ static int gbefb_probe(struct platform_device *p_dev) if (gbe_mem_phys) { /* memory was allocated at boot time */ - gbe_mem = devm_ioremap_nocache(&p_dev->dev, gbe_mem_phys, - gbe_mem_size); + gbe_mem = devm_ioremap_wc(&p_dev->dev, gbe_mem_phys, + gbe_mem_size); if (!gbe_mem) { printk(KERN_ERR "gbefb: couldn't map framebuffer\n"); ret = -ENOMEM; @@ -1188,8 +1185,8 @@ static int gbefb_probe(struct platform_device *p_dev) } else { /* try to allocate memory with the classical allocator * this has high chance to fail on low memory machines */ - gbe_mem = dma_alloc_coherent(NULL, gbe_mem_size, &gbe_dma_addr, - GFP_KERNEL); + gbe_mem = dma_alloc_writecombine(NULL, gbe_mem_size, + &gbe_dma_addr, GFP_KERNEL); if (!gbe_mem) { printk(KERN_ERR "gbefb: couldn't allocate framebuffer memory\n"); ret = -ENOMEM; @@ -1200,10 +1197,7 @@ static int gbefb_probe(struct platform_device *p_dev) } par = info->par; -#ifdef CONFIG_X86 - par->wc_cookie = mtrr_add(gbe_mem_phys, gbe_mem_size, - MTRR_TYPE_WRCOMB, 1); -#endif + par->wc_cookie = arch_phys_wc_add(gbe_mem_phys, gbe_mem_size); /* map framebuffer memory into tiles table */ for (i = 0; i < (gbe_mem_size >> TILE_SHIFT); i++) @@ -1242,12 +1236,9 @@ static int gbefb_probe(struct platform_device *p_dev) return 0; out_gbe_unmap: -#ifdef CONFIG_MTRR - if (par->wc_cookie >= 0) - mtrr_del(par->wc_cookie, 0, 0); -#endif + arch_phys_wc_del(par->wc_cookie); if (gbe_dma_addr) - dma_free_coherent(NULL, gbe_mem_size, gbe_mem, gbe_mem_phys); + dma_free_writecombine(NULL, gbe_mem_size, gbe_mem, gbe_mem_phys); out_tiles_free: dma_free_coherent(NULL, GBE_TLB_SIZE * sizeof(uint16_t), (void *)gbe_tiles.cpu, gbe_tiles.dma); @@ -1266,12 +1257,9 @@ static int gbefb_remove(struct platform_device* p_dev) unregister_framebuffer(info); gbe_turn_off(); -#ifdef CONFIG_MTRR - if (par->wc_cookie >= 0) - mtrr_del(par->wc_cookie, 0, 0); -#endif + arch_phys_wc_del(par->wc_cookie); if (gbe_dma_addr) - dma_free_coherent(NULL, gbe_mem_size, gbe_mem, gbe_mem_phys); + dma_free_writecombine(NULL, gbe_mem_size, gbe_mem, gbe_mem_phys); dma_free_coherent(NULL, GBE_TLB_SIZE * sizeof(uint16_t), (void *)gbe_tiles.cpu, gbe_tiles.dma); release_mem_region(GBE_BASE, sizeof(struct sgi_gbe)); -- 2.7.4