Hi,
On 2023/12/4 17:27, Thomas Zimmermann wrote:
Get the global screen_info's address once and access the data via
this pointer. Limits the use of global state.
Signed-off-by: Thomas Zimmermann <tzimmerm...@suse.de>
Reviewed-by: Javier Martinez Canillas <javi...@redhat.com>
Reviewed-by: Sui Jingfeng <suijingf...@loongson.cn>
I have applied the whole series and do a simple test with efifb:
Yeah, still works!
$ dmesg | grep efifb
[ 0.373800] efifb: probing for efifb
[ 0.373816] efifb: framebuffer at 0xe0030000000, using 5120k, total 5120k
[ 0.373818] efifb: mode is 1280x1024x32, linelength=5120, pages=1
[ 0.373820] efifb: scrolling: redraw
[ 0.373821] efifb: Truecolor: size=8:8:8:8, shift=24:16:8:0
---
drivers/video/fbdev/efifb.c | 113 ++++++++++++++++++------------------
1 file changed, 58 insertions(+), 55 deletions(-)
diff --git a/drivers/video/fbdev/efifb.c b/drivers/video/fbdev/efifb.c
index f9b4ddd592ce4..6cbb65bbe1110 100644
--- a/drivers/video/fbdev/efifb.c
+++ b/drivers/video/fbdev/efifb.c
@@ -147,10 +147,9 @@ static bool efifb_bgrt_sanity_check(struct screen_info
*si, u32 bmp_width)
}
#endif
-static void efifb_show_boot_graphics(struct fb_info *info)
+static void efifb_show_boot_graphics(struct fb_info *info, struct screen_info
*si)
I think, we probably can add a const modifier for the function
which doesn't modify our local the screen_info instance in the future.
static void efifb_show_boot_graphics(struct fb_info *info, const struct
screen_info *si)
Since screen_info is mostly used to provide information.
{
u32 bmp_width, bmp_height, bmp_pitch, dst_x, y, src_y;
- struct screen_info *si = &screen_info;
struct bmp_file_header *file_header;
struct bmp_dib_header *dib_header;
void *bgrt_image = NULL;
@@ -282,7 +281,7 @@ static const struct fb_ops efifb_ops = {
.fb_setcolreg = efifb_setcolreg,
};
-static int efifb_setup(char *options)
+static int efifb_setup(struct screen_info *si, char *options)
{
char *this_opt;
@@ -290,16 +289,16 @@ static int efifb_setup(char *options)
while ((this_opt = strsep(&options, ",")) != NULL) {
if (!*this_opt) continue;
- efifb_setup_from_dmi(&screen_info, this_opt);
+ efifb_setup_from_dmi(si, this_opt);
if (!strncmp(this_opt, "base:", 5))
- screen_info.lfb_base =
simple_strtoul(this_opt+5, NULL, 0);
+ si->lfb_base = simple_strtoul(this_opt+5, NULL,
0);
else if (!strncmp(this_opt, "stride:", 7))
- screen_info.lfb_linelength =
simple_strtoul(this_opt+7, NULL, 0) * 4;
+ si->lfb_linelength = simple_strtoul(this_opt+7,
NULL, 0) * 4;
else if (!strncmp(this_opt, "height:", 7))
- screen_info.lfb_height =
simple_strtoul(this_opt+7, NULL, 0);
+ si->lfb_height = simple_strtoul(this_opt+7,
NULL, 0);
else if (!strncmp(this_opt, "width:", 6))
- screen_info.lfb_width =
simple_strtoul(this_opt+6, NULL, 0);
+ si->lfb_width = simple_strtoul(this_opt+6,
NULL, 0);
else if (!strcmp(this_opt, "nowc"))
mem_flags &= ~EFI_MEMORY_WC;
else if (!strcmp(this_opt, "nobgrt"))
@@ -310,15 +309,15 @@ static int efifb_setup(char *options)
return 0;
}
-static inline bool fb_base_is_valid(void)
+static inline bool fb_base_is_valid(struct screen_info *si)
{
- if (screen_info.lfb_base)
+ if (si->lfb_base)
return true;
- if (!(screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE))
+ if (!(si->capabilities & VIDEO_CAPABILITY_64BIT_BASE))
return false;
- if (screen_info.ext_lfb_base)
+ if (si->ext_lfb_base)
return true;
return false;
@@ -329,7 +328,10 @@ static ssize_t name##_show(struct device *dev,
\
struct device_attribute *attr, \
char *buf) \
{ \
- return sprintf(buf, fmt "\n", (screen_info.lfb_##name)); \
+ struct screen_info *si = dev_get_platdata(dev); \
+ if (!si) \
+ return -ENODEV; \
+ return sprintf(buf, fmt "\n", (si->lfb_##name)); \
} \
static DEVICE_ATTR_RO(name)
@@ -356,6 +358,7 @@ static u64 bar_offset;
static int efifb_probe(struct platform_device *dev)
{
+ struct screen_info *si = &screen_info;
struct fb_info *info;
struct efifb_par *par;
int err, orientation;
@@ -365,48 +368,48 @@ static int efifb_probe(struct platform_device *dev)
char *option = NULL;
efi_memory_desc_t md;
- if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI || pci_dev_disabled)
+ if (si->orig_video_isVGA != VIDEO_TYPE_EFI || pci_dev_disabled)
return -ENODEV;
if (fb_get_options("efifb", &option))
return -ENODEV;
- efifb_setup(option);
+ efifb_setup(si, option);
/* We don't get linelength from UGA Draw Protocol, only from
* EFI Graphics Protocol. So if it's not in DMI, and it's not
* passed in from the user, we really can't use the framebuffer.
*/
- if (!screen_info.lfb_linelength)
+ if (!si->lfb_linelength)
return -ENODEV;
- if (!screen_info.lfb_depth)
- screen_info.lfb_depth = 32;
- if (!screen_info.pages)
- screen_info.pages = 1;
- if (!fb_base_is_valid()) {
+ if (!si->lfb_depth)
+ si->lfb_depth = 32;
+ if (!si->pages)
+ si->pages = 1;
+ if (!fb_base_is_valid(si)) {
printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
return -ENODEV;
}
printk(KERN_INFO "efifb: probing for efifb\n");
/* just assume they're all unset if any are */
- if (!screen_info.blue_size) {
- screen_info.blue_size = 8;
- screen_info.blue_pos = 0;
- screen_info.green_size = 8;
- screen_info.green_pos = 8;
- screen_info.red_size = 8;
- screen_info.red_pos = 16;
- screen_info.rsvd_size = 8;
- screen_info.rsvd_pos = 24;
+ if (!si->blue_size) {
+ si->blue_size = 8;
+ si->blue_pos = 0;
+ si->green_size = 8;
+ si->green_pos = 8;
+ si->red_size = 8;
+ si->red_pos = 16;
+ si->rsvd_size = 8;
+ si->rsvd_pos = 24;
}
Yeah, Here the efifb modified our local screen_info instance, but this is not
relevant to your patch.
- efifb_fix.smem_start = screen_info.lfb_base;
+ efifb_fix.smem_start = si->lfb_base;
- if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) {
+ if (si->capabilities & VIDEO_CAPABILITY_64BIT_BASE) {
u64 ext_lfb_base;
- ext_lfb_base = (u64)(unsigned long)screen_info.ext_lfb_base << 32;
+ ext_lfb_base = (u64)(unsigned long)si->ext_lfb_base << 32;
efifb_fix.smem_start |= ext_lfb_base;
}
@@ -417,10 +420,10 @@ static int efifb_probe(struct platform_device *dev)
efifb_fix.smem_start = bar_resource->start + bar_offset;
}
- efifb_defined.bits_per_pixel = screen_info.lfb_depth;
- efifb_defined.xres = screen_info.lfb_width;
- efifb_defined.yres = screen_info.lfb_height;
- efifb_fix.line_length = screen_info.lfb_linelength;
+ efifb_defined.bits_per_pixel = si->lfb_depth;
+ efifb_defined.xres = si->lfb_width;
+ efifb_defined.yres = si->lfb_height;
+ efifb_fix.line_length = si->lfb_linelength;
/* size_vmode -- that is the amount of memory needed for the
* used video mode, i.e. the minimum amount of
@@ -430,7 +433,7 @@ static int efifb_probe(struct platform_device *dev)
/* size_total -- all video memory we have. Used for
* entries, ressource allocation and bounds
* checking. */
- size_total = screen_info.lfb_size;
+ size_total = si->lfb_size;
if (size_total < size_vmode)
size_total = size_vmode;
@@ -512,7 +515,7 @@ static int efifb_probe(struct platform_device *dev)
pr_info("efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
efifb_defined.xres, efifb_defined.yres,
efifb_defined.bits_per_pixel, efifb_fix.line_length,
- screen_info.pages);
+ si->pages);
efifb_defined.xres_virtual = efifb_defined.xres;
efifb_defined.yres_virtual = efifb_fix.smem_len /
@@ -526,26 +529,26 @@ static int efifb_probe(struct platform_device *dev)
efifb_defined.left_margin = (efifb_defined.xres / 8) & 0xf8;
efifb_defined.hsync_len = (efifb_defined.xres / 8) & 0xf8;
- efifb_defined.red.offset = screen_info.red_pos;
- efifb_defined.red.length = screen_info.red_size;
- efifb_defined.green.offset = screen_info.green_pos;
- efifb_defined.green.length = screen_info.green_size;
- efifb_defined.blue.offset = screen_info.blue_pos;
- efifb_defined.blue.length = screen_info.blue_size;
- efifb_defined.transp.offset = screen_info.rsvd_pos;
- efifb_defined.transp.length = screen_info.rsvd_size;
+ efifb_defined.red.offset = si->red_pos;
+ efifb_defined.red.length = si->red_size;
+ efifb_defined.green.offset = si->green_pos;
+ efifb_defined.green.length = si->green_size;
+ efifb_defined.blue.offset = si->blue_pos;
+ efifb_defined.blue.length = si->blue_size;
+ efifb_defined.transp.offset = si->rsvd_pos;
+ efifb_defined.transp.length = si->rsvd_size;
pr_info("efifb: %s: "
"size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
"Truecolor",
- screen_info.rsvd_size,
- screen_info.red_size,
- screen_info.green_size,
- screen_info.blue_size,
- screen_info.rsvd_pos,
- screen_info.red_pos,
- screen_info.green_pos,
- screen_info.blue_pos);
+ si->rsvd_size,
+ si->red_size,
+ si->green_size,
+ si->blue_size,
+ si->rsvd_pos,
+ si->red_pos,
+ si->green_pos,
+ si->blue_pos);
efifb_fix.ypanstep = 0;
efifb_fix.ywrapstep = 0;
