From 034dd340b08be1f2f0477ad16131d609f9dbd53c Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 30 Aug 2026 09:22:00 -0700 Subject: Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace Pull tracing fixes from Steven Rostedt: - Fix error output of boot instance creation failure Currently if a boot instance creation fails, instead of printing out the name of the instance that failed, it prints "(null)". That is because it prints "cur_str" that had already been processed by strsep(). Print the saved name instead. While at it, print the error code of the failure. - Fix use-after-free for same named historgrams Histograms can be named so that they can be used in multiple events. But if the named histogram has a variable attached, the second event that uses the named histogram which duplicates it and needs to free the original after duplication leaves the old variable in place and still visible. If another histogram uses than variable, it will use the stale one which will try to reference the freed duplicate histogram and crash the kernel. Free the duplicate variables along with the duplicated histogram data. - Check return value of kthread_run() in event self test The events self tests uses a kthread for testing but does not check if it succeeded in creating a kthread. If the kthread creation were to fail, the code will still try to call kthread_stop() on the error returned. - Fix race between reading trace_pipe and updating subbuffer size If a user is reading the trace_pipe file at the same time they update the ring buffer sub-buffer size, can cause the trace_pipe read to read stale data. Add trace_access_lock() around updating the ring buffer sub-buffer size. - Fix eventfs_inode on failure path in creation of the events directory In the creation of the "events" directory, if after allocating the eventfs_inode a failure is detected, it calls cleanup_ei() which calls free_ei(). The free_ei() will test if eventfs_inode being freed has no children. It is a bug if it does. But on the failure case of the creation of the "events" directory, the children lists have not yet been initialized and the free will trigger a warning because list_empty() on an uninitialized list returns false. Move the initialization into init_ei() where it makes more sense and makes sure that a created eventfs_inode has its lists initialized upon creation. - Check return value of kthread_run() in ftrace direct sample code The sample code that shows how to use the ftrace direct calls does not test the return of kthread_run() to see if it succeeds. Return a failure if the kthread_run() doesn't succeed. - Clear user events state on fork in case of alloc failure On fork, the child gets a pointer to the parent's user events state. It makes a copy of it then updates the child's pointer to it. But if the allocation fails, the duplication function leaves the child with a pointer to its parent's descriptor. When the child cleans up its data, it will free the parent's descriptor while the parent is still using it. In the duplication function, set the child's user_event_mm to NULL before testing if the allocation succeeded, and when it exits it will not free the parent's descriptor. - Fix retry exhaustion in simple ring buffer reader swap simple_ring_buffer_swap_reader_page() starts with retry set to 8 and post-decrements it only after a failed link replacement. On the final attempt, a successful replacement leaves retry at zero, while a failed replacement leaves it at -1. But the check for success expects the retry value to be non-zero and exits with an error on zero. This is the opposite result. Fix it. - Fail nicely when the remote swap_reader_page() returns an error Currently, if the swap_reader_page() of a remote buffer fails, it triggers a WARN_ON_ONCE() and continues normally. Instead, have it exit with an error and a pr_warn() print instead of a full WARNING. * tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: ring-buffer: Stop remote reader update when page swap fails tracing: Fix retry exhaustion in simple ring buffer reader swap tracing/user_events: Clear copied tracing state before fork duplication samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify eventfs: Initialize ei->children and ei->list in init_ei() tracing: Fix use-after-free in trace_pipe read on sub-buffer order change tracing: Fix crash passing ERR_PTR to kthread_stop() tracing: Fix use-after-free with same-name named triggers tracing: Fix logged instance name on creation failure --- drivers/video/fbdev/cg3.c | 483 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 483 insertions(+) create mode 100644 drivers/video/fbdev/cg3.c (limited to 'drivers/video/fbdev/cg3.c') diff --git a/drivers/video/fbdev/cg3.c b/drivers/video/fbdev/cg3.c new file mode 100644 index 000000000..a58a48301 --- /dev/null +++ b/drivers/video/fbdev/cg3.c @@ -0,0 +1,483 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* cg3.c: CGTHREE frame buffer driver + * + * Copyright (C) 2003, 2006 David S. Miller (davem@davemloft.net) + * Copyright (C) 1996,1998 Jakub Jelinek (jj@ultra.linux.cz) + * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx) + * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be) + * + * Driver layout based loosely on tgafb.c, see that file for credits. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include "sbuslib.h" + +/* + * Local functions. + */ + +static int cg3_setcolreg(unsigned, unsigned, unsigned, unsigned, + unsigned, struct fb_info *); +static int cg3_blank(int, struct fb_info *); + +static int cg3_sbusfb_mmap(struct fb_info *info, struct vm_area_struct *vma); +static int cg3_sbusfb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg); + +/* + * Frame buffer operations + */ + +static const struct fb_ops cg3_ops = { + .owner = THIS_MODULE, + FB_DEFAULT_SBUS_OPS(cg3), + .fb_setcolreg = cg3_setcolreg, + .fb_blank = cg3_blank, +}; + + +/* Control Register Constants */ +#define CG3_CR_ENABLE_INTS 0x80 +#define CG3_CR_ENABLE_VIDEO 0x40 +#define CG3_CR_ENABLE_TIMING 0x20 +#define CG3_CR_ENABLE_CURCMP 0x10 +#define CG3_CR_XTAL_MASK 0x0c +#define CG3_CR_DIVISOR_MASK 0x03 + +/* Status Register Constants */ +#define CG3_SR_PENDING_INT 0x80 +#define CG3_SR_RES_MASK 0x70 +#define CG3_SR_1152_900_76_A 0x40 +#define CG3_SR_1152_900_76_B 0x60 +#define CG3_SR_ID_MASK 0x0f +#define CG3_SR_ID_COLOR 0x01 +#define CG3_SR_ID_MONO 0x02 +#define CG3_SR_ID_MONO_ECL 0x03 + +enum cg3_type { + CG3_AT_66HZ = 0, + CG3_AT_76HZ, + CG3_RDI +}; + +struct bt_regs { + u32 addr; + u32 color_map; + u32 control; + u32 cursor; +}; + +struct cg3_regs { + struct bt_regs cmap; + u8 control; + u8 status; + u8 cursor_start; + u8 cursor_end; + u8 h_blank_start; + u8 h_blank_end; + u8 h_sync_start; + u8 h_sync_end; + u8 comp_sync_end; + u8 v_blank_start_high; + u8 v_blank_start_low; + u8 v_blank_end; + u8 v_sync_start; + u8 v_sync_end; + u8 xfer_holdoff_start; + u8 xfer_holdoff_end; +}; + +/* Offset of interesting structures in the OBIO space */ +#define CG3_REGS_OFFSET 0x400000UL +#define CG3_RAM_OFFSET 0x800000UL + +struct cg3_par { + spinlock_t lock; + struct cg3_regs __iomem *regs; + u32 sw_cmap[((256 * 3) + 3) / 4]; + + u32 flags; +#define CG3_FLAG_BLANKED 0x00000001 +#define CG3_FLAG_RDI 0x00000002 + + unsigned long which_io; +}; + +/** + * cg3_setcolreg - Optional function. Sets a color register. + * @regno: boolean, 0 copy local, 1 get_user() function + * @red: frame buffer colormap structure + * @green: The green value which can be up to 16 bits wide + * @blue: The blue value which can be up to 16 bits wide. + * @transp: If supported the alpha value which can be up to 16 bits wide. + * @info: frame buffer info structure + * + * The cg3 palette is loaded with 4 color values at each time + * so you end up with: (rgb)(r), (gb)(rg), (b)(rgb), and so on. + * We keep a sw copy of the hw cmap to assist us in this esoteric + * loading procedure. + */ +static int cg3_setcolreg(unsigned regno, + unsigned red, unsigned green, unsigned blue, + unsigned transp, struct fb_info *info) +{ + struct cg3_par *par = (struct cg3_par *) info->par; + struct bt_regs __iomem *bt = &par->regs->cmap; + unsigned long flags; + u32 *p32; + u8 *p8; + int count; + + if (regno >= 256) + return 1; + + red >>= 8; + green >>= 8; + blue >>= 8; + + spin_lock_irqsave(&par->lock, flags); + + p8 = (u8 *)par->sw_cmap + (regno * 3); + p8[0] = red; + p8[1] = green; + p8[2] = blue; + +#define D4M3(x) ((((x)>>2)<<1) + ((x)>>2)) /* (x/4)*3 */ +#define D4M4(x) ((x)&~0x3) /* (x/4)*4 */ + + count = 3; + p32 = &par->sw_cmap[D4M3(regno)]; + sbus_writel(D4M4(regno), &bt->addr); + while (count--) + sbus_writel(*p32++, &bt->color_map); + +#undef D4M3 +#undef D4M4 + + spin_unlock_irqrestore(&par->lock, flags); + + return 0; +} + +/** + * cg3_blank - Optional function. Blanks the display. + * @blank: the blank mode we want. + * @info: frame buffer structure that represents a single frame buffer + */ +static int cg3_blank(int blank, struct fb_info *info) +{ + struct cg3_par *par = (struct cg3_par *) info->par; + struct cg3_regs __iomem *regs = par->regs; + unsigned long flags; + u8 val; + + spin_lock_irqsave(&par->lock, flags); + + switch (blank) { + case FB_BLANK_UNBLANK: /* Unblanking */ + val = sbus_readb(®s->control); + val |= CG3_CR_ENABLE_VIDEO; + sbus_writeb(val, ®s->control); + par->flags &= ~CG3_FLAG_BLANKED; + break; + + case FB_BLANK_NORMAL: /* Normal blanking */ + case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */ + case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */ + case FB_BLANK_POWERDOWN: /* Poweroff */ + val = sbus_readb(®s->control); + val &= ~CG3_CR_ENABLE_VIDEO; + sbus_writeb(val, ®s->control); + par->flags |= CG3_FLAG_BLANKED; + break; + } + + spin_unlock_irqrestore(&par->lock, flags); + + return 0; +} + +static const struct sbus_mmap_map cg3_mmap_map[] = { + { + .voff = CG3_MMAP_OFFSET, + .poff = CG3_RAM_OFFSET, + .size = SBUS_MMAP_FBSIZE(1) + }, + { .size = 0 } +}; + +static int cg3_sbusfb_mmap(struct fb_info *info, struct vm_area_struct *vma) +{ + struct cg3_par *par = (struct cg3_par *)info->par; + + return sbusfb_mmap_helper(cg3_mmap_map, + info->fix.smem_start, info->fix.smem_len, + par->which_io, + vma); +} + +static int cg3_sbusfb_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg) +{ + return sbusfb_ioctl_helper(cmd, arg, info, + FBTYPE_SUN3COLOR, 8, info->fix.smem_len); +} + +/* + * Initialisation + */ + +static void cg3_init_fix(struct fb_info *info, int linebytes, + struct device_node *dp) +{ + snprintf(info->fix.id, sizeof(info->fix.id), "%pOFn", dp); + + info->fix.type = FB_TYPE_PACKED_PIXELS; + info->fix.visual = FB_VISUAL_PSEUDOCOLOR; + + info->fix.line_length = linebytes; + + info->fix.accel = FB_ACCEL_SUN_CGTHREE; +} + +static void cg3_rdi_maybe_fixup_var(struct fb_var_screeninfo *var, + struct device_node *dp) +{ + const char *params; + char *p; + int ww, hh; + + params = of_get_property(dp, "params", NULL); + if (params) { + ww = simple_strtoul(params, &p, 10); + if (ww && *p == 'x') { + hh = simple_strtoul(p + 1, &p, 10); + if (hh && *p == '-') { + if (var->xres != ww || + var->yres != hh) { + var->xres = var->xres_virtual = ww; + var->yres = var->yres_virtual = hh; + } + } + } + } +} + +static u8 cg3regvals_66hz[] = { /* 1152 x 900, 66 Hz */ + 0x14, 0xbb, 0x15, 0x2b, 0x16, 0x04, 0x17, 0x14, + 0x18, 0xae, 0x19, 0x03, 0x1a, 0xa8, 0x1b, 0x24, + 0x1c, 0x01, 0x1d, 0x05, 0x1e, 0xff, 0x1f, 0x01, + 0x10, 0x20, 0 +}; + +static u8 cg3regvals_76hz[] = { /* 1152 x 900, 76 Hz */ + 0x14, 0xb7, 0x15, 0x27, 0x16, 0x03, 0x17, 0x0f, + 0x18, 0xae, 0x19, 0x03, 0x1a, 0xae, 0x1b, 0x2a, + 0x1c, 0x01, 0x1d, 0x09, 0x1e, 0xff, 0x1f, 0x01, + 0x10, 0x24, 0 +}; + +static u8 cg3regvals_rdi[] = { /* 640 x 480, cgRDI */ + 0x14, 0x70, 0x15, 0x20, 0x16, 0x08, 0x17, 0x10, + 0x18, 0x06, 0x19, 0x02, 0x1a, 0x31, 0x1b, 0x51, + 0x1c, 0x06, 0x1d, 0x0c, 0x1e, 0xff, 0x1f, 0x01, + 0x10, 0x22, 0 +}; + +static u8 *cg3_regvals[] = { + cg3regvals_66hz, cg3regvals_76hz, cg3regvals_rdi +}; + +static u_char cg3_dacvals[] = { + 4, 0xff, 5, 0x00, 6, 0x70, 7, 0x00, 0 +}; + +static int cg3_do_default_mode(struct cg3_par *par) +{ + enum cg3_type type; + u8 *p; + + if (par->flags & CG3_FLAG_RDI) + type = CG3_RDI; + else { + u8 status = sbus_readb(&par->regs->status), mon; + if ((status & CG3_SR_ID_MASK) == CG3_SR_ID_COLOR) { + mon = status & CG3_SR_RES_MASK; + if (mon == CG3_SR_1152_900_76_A || + mon == CG3_SR_1152_900_76_B) + type = CG3_AT_76HZ; + else + type = CG3_AT_66HZ; + } else { + printk(KERN_ERR "cgthree: can't handle SR %02x\n", + status); + return -EINVAL; + } + } + + for (p = cg3_regvals[type]; *p; p += 2) { + u8 __iomem *regp = &((u8 __iomem *)par->regs)[p[0]]; + sbus_writeb(p[1], regp); + } + for (p = cg3_dacvals; *p; p += 2) { + u8 __iomem *regp; + + regp = (u8 __iomem *)&par->regs->cmap.addr; + sbus_writeb(p[0], regp); + regp = (u8 __iomem *)&par->regs->cmap.control; + sbus_writeb(p[1], regp); + } + return 0; +} + +static int cg3_probe(struct platform_device *op) +{ + struct device_node *dp = op->dev.of_node; + struct fb_info *info; + struct cg3_par *par; + int linebytes, err; + + info = framebuffer_alloc(sizeof(struct cg3_par), &op->dev); + + err = -ENOMEM; + if (!info) + goto out_err; + par = info->par; + + spin_lock_init(&par->lock); + + info->fix.smem_start = op->resource[0].start; + par->which_io = op->resource[0].flags & IORESOURCE_BITS; + + sbusfb_fill_var(&info->var, dp, 8); + info->var.red.length = 8; + info->var.green.length = 8; + info->var.blue.length = 8; + if (of_node_name_eq(dp, "cgRDI")) + par->flags |= CG3_FLAG_RDI; + if (par->flags & CG3_FLAG_RDI) + cg3_rdi_maybe_fixup_var(&info->var, dp); + + linebytes = of_getintprop_default(dp, "linebytes", + info->var.xres); + info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres); + + par->regs = of_ioremap(&op->resource[0], CG3_REGS_OFFSET, + sizeof(struct cg3_regs), "cg3 regs"); + if (!par->regs) + goto out_release_fb; + + info->fbops = &cg3_ops; + info->screen_base = of_ioremap(&op->resource[0], CG3_RAM_OFFSET, + info->fix.smem_len, "cg3 ram"); + if (!info->screen_base) + goto out_unmap_regs; + + cg3_blank(FB_BLANK_UNBLANK, info); + + if (!of_property_present(dp, "width")) { + err = cg3_do_default_mode(par); + if (err) + goto out_unmap_screen; + } + + err = fb_alloc_cmap(&info->cmap, 256, 0); + if (err) + goto out_unmap_screen; + + fb_set_cmap(&info->cmap, info); + + cg3_init_fix(info, linebytes, dp); + + err = register_framebuffer(info); + if (err < 0) + goto out_dealloc_cmap; + + dev_set_drvdata(&op->dev, info); + + printk(KERN_INFO "%pOF: cg3 at %lx:%lx\n", + dp, par->which_io, info->fix.smem_start); + + return 0; + +out_dealloc_cmap: + fb_dealloc_cmap(&info->cmap); + +out_unmap_screen: + of_iounmap(&op->resource[0], info->screen_base, info->fix.smem_len); + +out_unmap_regs: + of_iounmap(&op->resource[0], par->regs, sizeof(struct cg3_regs)); + +out_release_fb: + framebuffer_release(info); + +out_err: + return err; +} + +static void cg3_remove(struct platform_device *op) +{ + struct fb_info *info = dev_get_drvdata(&op->dev); + struct cg3_par *par = info->par; + + unregister_framebuffer(info); + fb_dealloc_cmap(&info->cmap); + + of_iounmap(&op->resource[0], par->regs, sizeof(struct cg3_regs)); + of_iounmap(&op->resource[0], info->screen_base, info->fix.smem_len); + + framebuffer_release(info); +} + +static const struct of_device_id cg3_match[] = { + { + .name = "cgthree", + }, + { + .name = "cgRDI", + }, + {}, +}; +MODULE_DEVICE_TABLE(of, cg3_match); + +static struct platform_driver cg3_driver = { + .driver = { + .name = "cg3", + .of_match_table = cg3_match, + }, + .probe = cg3_probe, + .remove = cg3_remove, +}; + +static int __init cg3_init(void) +{ + if (fb_get_options("cg3fb", NULL)) + return -ENODEV; + + return platform_driver_register(&cg3_driver); +} + +static void __exit cg3_exit(void) +{ + platform_driver_unregister(&cg3_driver); +} + +module_init(cg3_init); +module_exit(cg3_exit); + +MODULE_DESCRIPTION("framebuffer driver for CGthree chipsets"); +MODULE_AUTHOR("David S. Miller "); +MODULE_VERSION("2.0"); +MODULE_LICENSE("GPL"); -- cgit v1.3.1