Commit-ID: c112709809b2ca1e8ff2841a1958503e548b81e4 Gitweb: http://git.kernel.org/tip/c112709809b2ca1e8ff2841a1958503e548b81e4 Author: Luis R. Rodriguez <[email protected]> AuthorDate: Mon, 24 Aug 2015 12:13:24 -0700 Committer: Ingo Molnar <[email protected]> CommitDate: Tue, 25 Aug 2015 09:59:44 +0200
drivers/video/fbdev/i740fb: Use arch_phys_wc_add() and pci_ioremap_wc_bar() Convert the driver from using the x86-specific MTRR code to the architecture-agnostic arch_phys_wc_add(). It will avoid MTRR if write-combining is available, in order to take advantage of that also ensure the ioremapped 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 it is being 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 ifdeffery 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); Signed-off-by: Luis R. Rodriguez <[email protected]> Signed-off-by: Borislav Petkov <[email protected]> Acked-by: Tomi Valkeinen <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Andy Lutomirski <[email protected]> Cc: Antonino Daplas <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: Benoit Taine <[email protected]> Cc: Bjorn Helgaas <[email protected]> Cc: Daniel Vetter <[email protected]> Cc: Dave Airlie <[email protected]> Cc: Geert Uytterhoeven <[email protected]> Cc: H. Peter Anvin <[email protected]> Cc: Jean-Christophe Plagniol-Villard <[email protected]> Cc: Jingoo Han <[email protected]> Cc: Juergen Gross <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Rob Clark <[email protected]> Cc: Suresh Siddha <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]> --- drivers/video/fbdev/i740fb.c | 35 ++++++----------------------------- 1 file changed, 6 insertions(+), 29 deletions(-) diff --git a/drivers/video/fbdev/i740fb.c b/drivers/video/fbdev/i740fb.c index a2b4204..452e116 100644 --- a/drivers/video/fbdev/i740fb.c +++ b/drivers/video/fbdev/i740fb.c @@ -27,24 +27,15 @@ #include <linux/console.h> #include <video/vga.h> -#ifdef CONFIG_MTRR -#include <asm/mtrr.h> -#endif - #include "i740_reg.h" static char *mode_option; - -#ifdef CONFIG_MTRR static int mtrr = 1; -#endif struct i740fb_par { unsigned char __iomem *regs; bool has_sgram; -#ifdef CONFIG_MTRR - int mtrr_reg; -#endif + int wc_cookie; bool ddc_registered; struct i2c_adapter ddc_adapter; struct i2c_algo_bit_data ddc_algo; @@ -1040,7 +1031,7 @@ static int i740fb_probe(struct pci_dev *dev, const struct pci_device_id *ent) goto err_request_regions; } - info->screen_base = pci_ioremap_bar(dev, 0); + info->screen_base = pci_ioremap_wc_bar(dev, 0); if (!info->screen_base) { dev_err(info->device, "error remapping base\n"); ret = -ENOMEM; @@ -1144,13 +1135,9 @@ static int i740fb_probe(struct pci_dev *dev, const struct pci_device_id *ent) fb_info(info, "%s frame buffer device\n", info->fix.id); pci_set_drvdata(dev, info); -#ifdef CONFIG_MTRR - if (mtrr) { - par->mtrr_reg = -1; - par->mtrr_reg = mtrr_add(info->fix.smem_start, - info->fix.smem_len, MTRR_TYPE_WRCOMB, 1); - } -#endif + if (mtrr) + par->wc_cookie = arch_phys_wc_add(info->fix.smem_start, + info->fix.smem_len); return 0; err_reg_framebuffer: @@ -1177,13 +1164,7 @@ static void i740fb_remove(struct pci_dev *dev) if (info) { struct i740fb_par *par = info->par; - -#ifdef CONFIG_MTRR - if (par->mtrr_reg >= 0) { - mtrr_del(par->mtrr_reg, 0, 0); - par->mtrr_reg = -1; - } -#endif + arch_phys_wc_del(par->wc_cookie); unregister_framebuffer(info); fb_dealloc_cmap(&info->cmap); if (par->ddc_registered) @@ -1287,10 +1268,8 @@ static int __init i740fb_setup(char *options) while ((opt = strsep(&options, ",")) != NULL) { if (!*opt) continue; -#ifdef CONFIG_MTRR else if (!strncmp(opt, "mtrr:", 5)) mtrr = simple_strtoul(opt + 5, NULL, 0); -#endif else mode_option = opt; } @@ -1327,7 +1306,5 @@ MODULE_DESCRIPTION("fbdev driver for Intel740"); module_param(mode_option, charp, 0444); MODULE_PARM_DESC(mode_option, "Default video mode ('640x480-8@60', etc)"); -#ifdef CONFIG_MTRR module_param(mtrr, int, 0444); MODULE_PARM_DESC(mtrr, "Enable write-combining with MTRR (1=enable, 0=disable, default=1)"); -#endif -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
