From 78084dcf2926a646de42041454c13836a6fc44c6 Mon Sep 17 00:00:00 2001 From: "Luis R. Rodriguez" Date: Tue, 21 Apr 2015 13:16:25 -0700 Subject: [PATCH] video: fbdev: intelfb: use arch_phys_wc_add() and ioremap_wc() Although this driver gives the framebuffer layer a different size for the framebuffer it uses the entire aperture PCI BAR size for the MTRR. Since the framebuffer is included in that range and MTRR was used on the entire PCI BAR WC will have been preferred on that range as well. This propagates the WC preference on the same entire PCI BAR. 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: Maik Broemme Cc: Jean-Christophe Plagniol-Villard Cc: Tomi Valkeinen Cc: Suresh Siddha Cc: Ingo Molnar Cc: Thomas Gleixner Cc: Juergen Gross Cc: Daniel Vetter Cc: Andy Lutomirski Cc: Dave Airlie Cc: Antonino Daplas Cc: linux-fbdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Luis R. Rodriguez Reviewed-by: Dave Airlie Signed-off-by: Tomi Valkeinen --- drivers/video/fbdev/intelfb/intelfb.h | 4 +-- drivers/video/fbdev/intelfb/intelfbdrv.c | 38 +++--------------------- 2 files changed, 5 insertions(+), 37 deletions(-) diff --git a/drivers/video/fbdev/intelfb/intelfb.h b/drivers/video/fbdev/intelfb/intelfb.h index 6b51175629c7..37f8339ea88c 100644 --- a/drivers/video/fbdev/intelfb/intelfb.h +++ b/drivers/video/fbdev/intelfb/intelfb.h @@ -285,9 +285,7 @@ struct intelfb_info { /* use a gart reserved fb mem */ u8 fbmem_gart; - /* mtrr support */ - int mtrr_reg; - u32 has_mtrr; + int wc_cookie; /* heap data */ struct intelfb_heap_data aperture; diff --git a/drivers/video/fbdev/intelfb/intelfbdrv.c b/drivers/video/fbdev/intelfb/intelfbdrv.c index b847d530471a..bbec737eef30 100644 --- a/drivers/video/fbdev/intelfb/intelfbdrv.c +++ b/drivers/video/fbdev/intelfb/intelfbdrv.c @@ -124,10 +124,6 @@ #include -#ifdef CONFIG_MTRR -#include -#endif - #include "intelfb.h" #include "intelfbhw.h" #include "../edid.h" @@ -410,33 +406,6 @@ static void __exit intelfb_exit(void) module_init(intelfb_init); module_exit(intelfb_exit); -/*************************************************************** - * mtrr support functions * - ***************************************************************/ - -#ifdef CONFIG_MTRR -static inline void set_mtrr(struct intelfb_info *dinfo) -{ - dinfo->mtrr_reg = mtrr_add(dinfo->aperture.physical, - dinfo->aperture.size, MTRR_TYPE_WRCOMB, 1); - if (dinfo->mtrr_reg < 0) { - ERR_MSG("unable to set MTRR\n"); - return; - } - dinfo->has_mtrr = 1; -} -static inline void unset_mtrr(struct intelfb_info *dinfo) -{ - if (dinfo->has_mtrr) - mtrr_del(dinfo->mtrr_reg, dinfo->aperture.physical, - dinfo->aperture.size); -} -#else -#define set_mtrr(x) WRN_MSG("MTRR is disabled in the kernel\n") - -#define unset_mtrr(x) do { } while (0) -#endif /* CONFIG_MTRR */ - /*************************************************************** * driver init / cleanup * ***************************************************************/ @@ -456,7 +425,7 @@ static void cleanup(struct intelfb_info *dinfo) if (dinfo->registered) unregister_framebuffer(dinfo->info); - unset_mtrr(dinfo); + arch_phys_wc_del(dinfo->wc_cookie); if (dinfo->fbmem_gart && dinfo->gtt_fb_mem) { agp_unbind_memory(dinfo->gtt_fb_mem); @@ -675,7 +644,7 @@ static int intelfb_pci_register(struct pci_dev *pdev, /* Allocate memories (which aren't stolen) */ /* Map the fb and MMIO regions */ /* ioremap only up to the end of used aperture */ - dinfo->aperture.virtual = (u8 __iomem *)ioremap_nocache + dinfo->aperture.virtual = (u8 __iomem *)ioremap_wc (dinfo->aperture.physical, ((offset + dinfo->fb.offset) << 12) + dinfo->fb.size); if (!dinfo->aperture.virtual) { @@ -772,7 +741,8 @@ static int intelfb_pci_register(struct pci_dev *pdev, agp_backend_release(bridge); if (mtrr) - set_mtrr(dinfo); + dinfo->wc_cookie = arch_phys_wc_add(dinfo->aperture.physical, + dinfo->aperture.size); DBG_MSG("fb: 0x%x(+ 0x%x)/0x%x (0x%p)\n", dinfo->fb.physical, dinfo->fb.offset, dinfo->fb.size, -- 2.20.1