[v2,02/24] drivers/video/fbdev: use ioremap_wc/wt() instead of __ioremap()
diff mbox series

Message ID 2f980cf32a05415662272cf052c2b9e2a94c756f.1536692743.git.christophe.leroy@c-s.fr
State Superseded
Headers show
Series
  • ban the use of _PAGE_XXX flags outside platform specific code
Related show

Checks

Context Check Description
snowpatch_ozlabs/checkpatch success Test checkpatch on branch next
snowpatch_ozlabs/apply_patch success next/apply_patch Successfully applied

Commit Message

Christophe Leroy Sept. 12, 2018, 3:58 p.m. UTC
_PAGE_NO_CACHE is a platform specific flag. In addition, this flag
is misleading because one would think it requests a noncached page
whereas a noncached page is _PAGE_NO_CACHE | _PAGE_GUARDED

_PAGE_NO_CACHE alone means write combined noncached page, so lets
use ioremap_wc() instead.

_PAGE_WRITETHRU is also platform specific flag. Use ioremap_wt()
instead.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
 drivers/video/fbdev/chipsfb.c    |  3 +--
 drivers/video/fbdev/controlfb.c  |  5 +----
 drivers/video/fbdev/platinumfb.c |  5 +----
 drivers/video/fbdev/valkyriefb.c | 12 ++++++------
 4 files changed, 9 insertions(+), 16 deletions(-)

Comments

Daniel Vetter Sept. 13, 2018, 1:33 p.m. UTC | #1
On Wed, Sep 12, 2018 at 03:58:17PM +0000, Christophe Leroy wrote:
> _PAGE_NO_CACHE is a platform specific flag. In addition, this flag
> is misleading because one would think it requests a noncached page
> whereas a noncached page is _PAGE_NO_CACHE | _PAGE_GUARDED
> 
> _PAGE_NO_CACHE alone means write combined noncached page, so lets
> use ioremap_wc() instead.
> 
> _PAGE_WRITETHRU is also platform specific flag. Use ioremap_wt()
> instead.
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>

I wondered why this all showed up in my gfx inbox, then spotted this patch
here.

I trust you way more on the _PAGE_ flags than me, but this looks
reasonable.

Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>

> ---
>  drivers/video/fbdev/chipsfb.c    |  3 +--
>  drivers/video/fbdev/controlfb.c  |  5 +----
>  drivers/video/fbdev/platinumfb.c |  5 +----
>  drivers/video/fbdev/valkyriefb.c | 12 ++++++------
>  4 files changed, 9 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/video/fbdev/chipsfb.c b/drivers/video/fbdev/chipsfb.c
> index f103665cad43..40182ed85648 100644
> --- a/drivers/video/fbdev/chipsfb.c
> +++ b/drivers/video/fbdev/chipsfb.c
> @@ -27,7 +27,6 @@
>  #include <linux/init.h>
>  #include <linux/pci.h>
>  #include <linux/console.h>
> -#include <asm/io.h>
>  
>  #ifdef CONFIG_PMAC_BACKLIGHT
>  #include <asm/backlight.h>
> @@ -401,7 +400,7 @@ static int chipsfb_pci_init(struct pci_dev *dp, const struct pci_device_id *ent)
>  #endif /* CONFIG_PMAC_BACKLIGHT */
>  
>  #ifdef CONFIG_PPC
> -	p->screen_base = __ioremap(addr, 0x200000, _PAGE_NO_CACHE);
> +	p->screen_base = ioremap_wc(addr, 0x200000);
>  #else
>  	p->screen_base = ioremap(addr, 0x200000);
>  #endif
> diff --git a/drivers/video/fbdev/controlfb.c b/drivers/video/fbdev/controlfb.c
> index 8d14b29aafea..9cb0ef7ac29e 100644
> --- a/drivers/video/fbdev/controlfb.c
> +++ b/drivers/video/fbdev/controlfb.c
> @@ -48,9 +48,7 @@
>  #include <linux/nvram.h>
>  #include <linux/adb.h>
>  #include <linux/cuda.h>
> -#include <asm/io.h>
>  #include <asm/prom.h>
> -#include <asm/pgtable.h>
>  #include <asm/btext.h>
>  
>  #include "macmodes.h"
> @@ -715,8 +713,7 @@ static int __init control_of_init(struct device_node *dp)
>  		goto error_out;
>  	}
>  	/* map at most 8MB for the frame buffer */
> -	p->frame_buffer = __ioremap(p->frame_buffer_phys, 0x800000,
> -				    _PAGE_WRITETHRU);
> +	p->frame_buffer = ioremap_wt(p->frame_buffer_phys, 0x800000);
>  
>  	if (!p->control_regs_phys ||
>  	    !request_mem_region(p->control_regs_phys, p->control_regs_size,
> diff --git a/drivers/video/fbdev/platinumfb.c b/drivers/video/fbdev/platinumfb.c
> index 377d3399a3ad..bf6b7fb83cf4 100644
> --- a/drivers/video/fbdev/platinumfb.c
> +++ b/drivers/video/fbdev/platinumfb.c
> @@ -32,9 +32,7 @@
>  #include <linux/nvram.h>
>  #include <linux/of_device.h>
>  #include <linux/of_platform.h>
> -#include <asm/io.h>
>  #include <asm/prom.h>
> -#include <asm/pgtable.h>
>  
>  #include "macmodes.h"
>  #include "platinumfb.h"
> @@ -577,8 +575,7 @@ static int platinumfb_probe(struct platform_device* odev)
>  
>  	/* frame buffer - map only 4MB */
>  	pinfo->frame_buffer_phys = pinfo->rsrc_fb.start;
> -	pinfo->frame_buffer = __ioremap(pinfo->rsrc_fb.start, 0x400000,
> -					_PAGE_WRITETHRU);
> +	pinfo->frame_buffer = ioremap_wt(pinfo->rsrc_fb.start, 0x400000);
>  	pinfo->base_frame_buffer = pinfo->frame_buffer;
>  
>  	/* registers */
> diff --git a/drivers/video/fbdev/valkyriefb.c b/drivers/video/fbdev/valkyriefb.c
> index 275fb98236d3..d51c3a8009cb 100644
> --- a/drivers/video/fbdev/valkyriefb.c
> +++ b/drivers/video/fbdev/valkyriefb.c
> @@ -54,13 +54,11 @@
>  #include <linux/nvram.h>
>  #include <linux/adb.h>
>  #include <linux/cuda.h>
> -#include <asm/io.h>
>  #ifdef CONFIG_MAC
>  #include <asm/macintosh.h>
>  #else
>  #include <asm/prom.h>
>  #endif
> -#include <asm/pgtable.h>
>  
>  #include "macmodes.h"
>  #include "valkyriefb.h"
> @@ -318,7 +316,7 @@ static void __init valkyrie_choose_mode(struct fb_info_valkyrie *p)
>  int __init valkyriefb_init(void)
>  {
>  	struct fb_info_valkyrie	*p;
> -	unsigned long frame_buffer_phys, cmap_regs_phys, flags;
> +	unsigned long frame_buffer_phys, cmap_regs_phys;
>  	int err;
>  	char *option = NULL;
>  
> @@ -337,7 +335,6 @@ int __init valkyriefb_init(void)
>  	/* Hardcoded addresses... welcome to 68k Macintosh country :-) */
>  	frame_buffer_phys = 0xf9000000;
>  	cmap_regs_phys = 0x50f24000;
> -	flags = IOMAP_NOCACHE_SER; /* IOMAP_WRITETHROUGH?? */
>  #else /* ppc (!CONFIG_MAC) */
>  	{
>  		struct device_node *dp;
> @@ -354,7 +351,6 @@ int __init valkyriefb_init(void)
>  
>  		frame_buffer_phys = r.start;
>  		cmap_regs_phys = r.start + 0x304000;
> -		flags = _PAGE_WRITETHRU;
>  	}
>  #endif /* ppc (!CONFIG_MAC) */
>  
> @@ -369,7 +365,11 @@ int __init valkyriefb_init(void)
>  	}
>  	p->total_vram = 0x100000;
>  	p->frame_buffer_phys = frame_buffer_phys;
> -	p->frame_buffer = __ioremap(frame_buffer_phys, p->total_vram, flags);
> +#ifdef CONFIG_MAC
> +	p->frame_buffer = ioremap_nocache(frame_buffer_phys, p->total_vram);
> +#else
> +	p->frame_buffer = ioremap_wt(frame_buffer_phys, p->total_vram);
> +#endif
>  	p->cmap_regs_phys = cmap_regs_phys;
>  	p->cmap_regs = ioremap(p->cmap_regs_phys, 0x1000);
>  	p->valkyrie_regs_phys = cmap_regs_phys+0x6000;
> -- 
> 2.13.3
> 
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
Bartlomiej Zolnierkiewicz Sept. 13, 2018, 5:02 p.m. UTC | #2
On 09/12/2018 05:58 PM, Christophe Leroy wrote:
> _PAGE_NO_CACHE is a platform specific flag. In addition, this flag
> is misleading because one would think it requests a noncached page
> whereas a noncached page is _PAGE_NO_CACHE | _PAGE_GUARDED
> 
> _PAGE_NO_CACHE alone means write combined noncached page, so lets
> use ioremap_wc() instead.
> 
> _PAGE_WRITETHRU is also platform specific flag. Use ioremap_wt()
> instead.
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>

After reading patch #1 this one LGTM.

Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

> ---
>  drivers/video/fbdev/chipsfb.c    |  3 +--
>  drivers/video/fbdev/controlfb.c  |  5 +----
>  drivers/video/fbdev/platinumfb.c |  5 +----
>  drivers/video/fbdev/valkyriefb.c | 12 ++++++------
>  4 files changed, 9 insertions(+), 16 deletions(-)

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics

Patch
diff mbox series

diff --git a/drivers/video/fbdev/chipsfb.c b/drivers/video/fbdev/chipsfb.c
index f103665cad43..40182ed85648 100644
--- a/drivers/video/fbdev/chipsfb.c
+++ b/drivers/video/fbdev/chipsfb.c
@@ -27,7 +27,6 @@ 
 #include <linux/init.h>
 #include <linux/pci.h>
 #include <linux/console.h>
-#include <asm/io.h>
 
 #ifdef CONFIG_PMAC_BACKLIGHT
 #include <asm/backlight.h>
@@ -401,7 +400,7 @@  static int chipsfb_pci_init(struct pci_dev *dp, const struct pci_device_id *ent)
 #endif /* CONFIG_PMAC_BACKLIGHT */
 
 #ifdef CONFIG_PPC
-	p->screen_base = __ioremap(addr, 0x200000, _PAGE_NO_CACHE);
+	p->screen_base = ioremap_wc(addr, 0x200000);
 #else
 	p->screen_base = ioremap(addr, 0x200000);
 #endif
diff --git a/drivers/video/fbdev/controlfb.c b/drivers/video/fbdev/controlfb.c
index 8d14b29aafea..9cb0ef7ac29e 100644
--- a/drivers/video/fbdev/controlfb.c
+++ b/drivers/video/fbdev/controlfb.c
@@ -48,9 +48,7 @@ 
 #include <linux/nvram.h>
 #include <linux/adb.h>
 #include <linux/cuda.h>
-#include <asm/io.h>
 #include <asm/prom.h>
-#include <asm/pgtable.h>
 #include <asm/btext.h>
 
 #include "macmodes.h"
@@ -715,8 +713,7 @@  static int __init control_of_init(struct device_node *dp)
 		goto error_out;
 	}
 	/* map at most 8MB for the frame buffer */
-	p->frame_buffer = __ioremap(p->frame_buffer_phys, 0x800000,
-				    _PAGE_WRITETHRU);
+	p->frame_buffer = ioremap_wt(p->frame_buffer_phys, 0x800000);
 
 	if (!p->control_regs_phys ||
 	    !request_mem_region(p->control_regs_phys, p->control_regs_size,
diff --git a/drivers/video/fbdev/platinumfb.c b/drivers/video/fbdev/platinumfb.c
index 377d3399a3ad..bf6b7fb83cf4 100644
--- a/drivers/video/fbdev/platinumfb.c
+++ b/drivers/video/fbdev/platinumfb.c
@@ -32,9 +32,7 @@ 
 #include <linux/nvram.h>
 #include <linux/of_device.h>
 #include <linux/of_platform.h>
-#include <asm/io.h>
 #include <asm/prom.h>
-#include <asm/pgtable.h>
 
 #include "macmodes.h"
 #include "platinumfb.h"
@@ -577,8 +575,7 @@  static int platinumfb_probe(struct platform_device* odev)
 
 	/* frame buffer - map only 4MB */
 	pinfo->frame_buffer_phys = pinfo->rsrc_fb.start;
-	pinfo->frame_buffer = __ioremap(pinfo->rsrc_fb.start, 0x400000,
-					_PAGE_WRITETHRU);
+	pinfo->frame_buffer = ioremap_wt(pinfo->rsrc_fb.start, 0x400000);
 	pinfo->base_frame_buffer = pinfo->frame_buffer;
 
 	/* registers */
diff --git a/drivers/video/fbdev/valkyriefb.c b/drivers/video/fbdev/valkyriefb.c
index 275fb98236d3..d51c3a8009cb 100644
--- a/drivers/video/fbdev/valkyriefb.c
+++ b/drivers/video/fbdev/valkyriefb.c
@@ -54,13 +54,11 @@ 
 #include <linux/nvram.h>
 #include <linux/adb.h>
 #include <linux/cuda.h>
-#include <asm/io.h>
 #ifdef CONFIG_MAC
 #include <asm/macintosh.h>
 #else
 #include <asm/prom.h>
 #endif
-#include <asm/pgtable.h>
 
 #include "macmodes.h"
 #include "valkyriefb.h"
@@ -318,7 +316,7 @@  static void __init valkyrie_choose_mode(struct fb_info_valkyrie *p)
 int __init valkyriefb_init(void)
 {
 	struct fb_info_valkyrie	*p;
-	unsigned long frame_buffer_phys, cmap_regs_phys, flags;
+	unsigned long frame_buffer_phys, cmap_regs_phys;
 	int err;
 	char *option = NULL;
 
@@ -337,7 +335,6 @@  int __init valkyriefb_init(void)
 	/* Hardcoded addresses... welcome to 68k Macintosh country :-) */
 	frame_buffer_phys = 0xf9000000;
 	cmap_regs_phys = 0x50f24000;
-	flags = IOMAP_NOCACHE_SER; /* IOMAP_WRITETHROUGH?? */
 #else /* ppc (!CONFIG_MAC) */
 	{
 		struct device_node *dp;
@@ -354,7 +351,6 @@  int __init valkyriefb_init(void)
 
 		frame_buffer_phys = r.start;
 		cmap_regs_phys = r.start + 0x304000;
-		flags = _PAGE_WRITETHRU;
 	}
 #endif /* ppc (!CONFIG_MAC) */
 
@@ -369,7 +365,11 @@  int __init valkyriefb_init(void)
 	}
 	p->total_vram = 0x100000;
 	p->frame_buffer_phys = frame_buffer_phys;
-	p->frame_buffer = __ioremap(frame_buffer_phys, p->total_vram, flags);
+#ifdef CONFIG_MAC
+	p->frame_buffer = ioremap_nocache(frame_buffer_phys, p->total_vram);
+#else
+	p->frame_buffer = ioremap_wt(frame_buffer_phys, p->total_vram);
+#endif
 	p->cmap_regs_phys = cmap_regs_phys;
 	p->cmap_regs = ioremap(p->cmap_regs_phys, 0x1000);
 	p->valkyrie_regs_phys = cmap_regs_phys+0x6000;