From: "Luis R. Rodriguez" <mcgrof@xxxxxxxx> 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 <mcgrof@xxxxxxxx> Acked-by: Tomi Valkeinen <tomi.valkeinen@xxxxxx> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx> Cc: Antonino Daplas <adaplas@xxxxxxxxx> Cc: Arnd Bergmann <arnd@xxxxxxxx> Cc: benh@xxxxxxxxxxxxxxxxxxx Cc: bhelgaas@xxxxxxxxxx Cc: Daniel Vetter <daniel.vetter@xxxxxxxx> Cc: Dave Airlie <airlied@xxxxxxxxxx> Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> Cc: H. Peter Anvin <hpa@xxxxxxxxx> Cc: Ingo Molnar <mingo@xxxxxxxxxx> Cc: Jean-Christophe Plagniol-Villard <plagnioj@xxxxxxxxxxxx> Cc: Jingoo Han <jg1.han@xxxxxxxxxxx> Cc: Juergen Gross <jgross@xxxxxxxx> Cc: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> Cc: linux-fbdev@xxxxxxxxxxxxxxx Cc: linux-pci@xxxxxxxxxxxxxxx Cc: mst@xxxxxxxxxx Cc: Suresh Siddha <sbsiddha@xxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: toshi.kani@xxxxxx Link: http://lkml.kernel.org/r/1435195342-26879-4-git-send-email-mcgrof@xxxxxxxxxxxxxxxx Signed-off-by: Borislav Petkov <bp@xxxxxxx> --- drivers/video/fbdev/kyro/fbdev.c | 33 +++++++++++---------------------- include/video/kyro.h | 4 +--- 2 files changed, 12 insertions(+), 25 deletions(-) diff --git a/drivers/video/fbdev/kyro/fbdev.c b/drivers/video/fbdev/kyro/fbdev.c index 65041e15fd59..5bb01533271e 100644 --- a/drivers/video/fbdev/kyro/fbdev.c +++ b/drivers/video/fbdev/kyro/fbdev.c @@ -22,9 +22,6 @@ #include <linux/pci.h> #include <asm/io.h> #include <linux/uaccess.h> -#ifdef CONFIG_MTRR -#include <asm/mtrr.h> -#endif #include <video/kyro.h> @@ -84,9 +81,7 @@ static device_info_t deviceInfo; static char *mode_option = NULL; static int nopan = 0; static int nowrap = 1; -#ifdef CONFIG_MTRR static int nomtrr = 0; -#endif /* PCI driver prototypes */ static int kyrofb_probe(struct pci_dev *pdev, const struct pci_device_id *ent); @@ -570,10 +565,8 @@ static int __init kyrofb_setup(char *options) nopan = 1; } else if (strcmp(this_opt, "nowrap") == 0) { nowrap = 1; -#ifdef CONFIG_MTRR } else if (strcmp(this_opt, "nomtrr") == 0) { nomtrr = 1; -#endif } else { mode_option = this_opt; } @@ -691,17 +684,16 @@ static int kyrofb_probe(struct pci_dev *pdev, const struct pci_device_id *ent) currentpar->regbase = deviceInfo.pSTGReg = ioremap_nocache(kyro_fix.mmio_start, kyro_fix.mmio_len); + if (!currentpar->regbase) + goto out_free_fb; - info->screen_base = ioremap_nocache(kyro_fix.smem_start, - kyro_fix.smem_len); + info->screen_base = pci_ioremap_wc_bar(pdev, 0); + if (!info->screen_base) + goto out_unmap_regs; -#ifdef CONFIG_MTRR if (!nomtrr) - currentpar->mtrr_handle = - mtrr_add(kyro_fix.smem_start, - kyro_fix.smem_len, - MTRR_TYPE_WRCOMB, 1); -#endif + currentpar->wc_cookie = arch_phys_wc_add(kyro_fix.smem_start, + kyro_fix.smem_len); kyro_fix.ypanstep = nopan ? 0 : 1; kyro_fix.ywrapstep = nowrap ? 0 : 1; @@ -745,8 +737,10 @@ static int kyrofb_probe(struct pci_dev *pdev, const struct pci_device_id *ent) return 0; out_unmap: - iounmap(currentpar->regbase); iounmap(info->screen_base); +out_unmap_regs: + iounmap(currentpar->regbase); +out_free_fb: framebuffer_release(info); return -EINVAL; @@ -770,12 +764,7 @@ static void kyrofb_remove(struct pci_dev *pdev) iounmap(info->screen_base); iounmap(par->regbase); -#ifdef CONFIG_MTRR - if (par->mtrr_handle) - mtrr_del(par->mtrr_handle, - info->fix.smem_start, - info->fix.smem_len); -#endif + arch_phys_wc_del(par->wc_cookie); unregister_framebuffer(info); framebuffer_release(info); diff --git a/include/video/kyro.h b/include/video/kyro.h index c563968e926c..b958c2e9c915 100644 --- a/include/video/kyro.h +++ b/include/video/kyro.h @@ -35,9 +35,7 @@ struct kyrofb_info { /* Useful to hold depth here for Linux */ u8 PIXDEPTH; -#ifdef CONFIG_MTRR - int mtrr_handle; -#endif + int wc_cookie; }; extern int kyro_dev_init(void); -- 2.4.3 -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
