/* * Wireless Host Controller (WHC) hardware access helpers. * * Copyright (C) 2007 Cambridge Silicon Radio Ltd. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License version * 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include #include #include #include "../../wusbcore/wusbhc.h" #include "whcd.h" void whc_write_wusbcmd(struct whc *whc, u32 mask, u32 val) { unsigned long flags; u32 cmd; spin_lock_irqsave(&whc->lock, flags); cmd = le_readl(whc->base + WUSBCMD); cmd = (cmd & ~mask) | val; le_writel(cmd, whc->base + WUSBCMD); spin_unlock_irqrestore(&whc->lock, flags); } /** * whc_do_gencmd - start a generic command via the WUSBGENCMDSTS register * @whc: the WHCI HC * @cmd: command to start. * @params: parameters for the command (the WUSBGENCMDPARAMS register value). * @addr: pointer to any data for the command (may be NULL). * @len: length of the data (if any). */ int whc_do_gencmd(struct whc *whc, u32 cmd, u32 params, void *addr, size_t len) { unsigned long flags; dma_addr_t dma_addr; int t; int ret = 0; mutex_lock(&whc->mutex); /* Wait for previous command to complete. */ t = wait_event_timeout(whc->cmd_wq, (le_readl(whc->base + WUSBGENCMDSTS) & WUSBGENCMDSTS_ACTIVE) == 0, WHC_GENCMD_TIMEOUT_MS); if (t == 0) { dev_err(&whc->umc->dev, "generic command timeout (%04x/%04x)\n", le_readl(whc->base + WUSBGENCMDSTS), le_readl(whc->base + WUSBGENCMDPARAMS)); ret = -ETIMEDOUT; goto out; } if (addr) { memcpy(whc->gen_cmd_buf, addr, len); dma_addr = whc->gen_cmd_buf_dma; } else dma_addr = 0; /* Poke registers to start cmd. */ spin_lock_irqsave(&whc->lock, flags); le_writel(params, whc->base + WUSBGENCMDPARAMS); le_writeq(dma_addr, whc->base + WUSBGENADDR); le_writel(WUSBGENCMDSTS_ACTIVE | WUSBGENCMDSTS_IOC | cmd, whc->base + WUSBGENCMDSTS); spin_unlock_irqrestore(&whc->lock, flags); out: mutex_unlock(&whc->mutex); return ret; } /** * whc_hw_error - recover from a hardware error * @whc: the WHCI HC that broke. * @reason: a description of the failure. * * Recover from broken hardware with a full reset. */ void whc_hw_error(struct whc *whc, const char *reason) { struct wusbhc *wusbhc = &whc->wusbhc; dev_err(&whc->umc->dev, "hardware error: %s\n", reason); wusbhc_reset_all(wusbhc); } 26f'>net/iucv/af_iucv.c
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authorJiri Kosina <jkosina@suse.cz>2017-01-27 22:25:52 +0000
committerIngo Molnar <mingo@kernel.org>2017-01-28 09:18:56 +0100
commitbf29bddf0417a4783da3b24e8c9e017ac649326f (patch)
tree54a05a4883b73f80e4e1d8c4b15750aa01c39932 /net/iucv/af_iucv.c
parent883af14e67e8b8702b5560aa64c888c0cd0bd66c (diff)
x86/efi: Always map the first physical page into the EFI pagetables
Commit: 129766708 ("x86/efi: Only map RAM into EFI page tables if in mixed-mode") stopped creating 1:1 mappings for all RAM, when running in native 64-bit mode. It turns out though that there are 64-bit EFI implementations in the wild (this particular problem has been reported on a Lenovo Yoga 710-11IKB), which still make use of the first physical page for their own private use, even though they explicitly mark it EFI_CONVENTIONAL_MEMORY in the memory map. In case there is no mapping for this particular frame in the EFI pagetables, as soon as firmware tries to make use of it, a triple fault occurs and the system reboots (in case of the Yoga 710-11IKB this is very early during bootup). Fix that by always mapping the first page of physical memory into the EFI pagetables. We're free to hand this page to the BIOS, as trim_bios_range() will reserve the first page and isolate it away from memory allocators anyway. Note that just reverting 129766708 alone is not enough on v4.9-rc1+ to fix the regression on affected hardware, as this commit: ab72a27da ("x86/efi: Consolidate region mapping logic") later made the first physical frame not to be mapped anyway. Reported-by: Hanka Pavlikova <hanka@ucw.cz> Signed-off-by: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Borislav Petkov <bp@suse.de> Cc: Laura Abbott <labbott@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vojtech Pavlik <vojtech@ucw.cz> Cc: Waiman Long <waiman.long@hpe.com> Cc: linux-efi@vger.kernel.org Cc: stable@kernel.org # v4.8+ Fixes: 129766708 ("x86/efi: Only map RAM into EFI page tables if in mixed-mode") Link: http://lkml.kernel.org/r/20170127222552.22336-1-matt@codeblueprint.co.uk [ Tidied up the changelog and the comment. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'net/iucv/af_iucv.c')