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Message-Id: <507BD5DF02000078000A13EE@nat28.tlf.novell.com>
Date: Mon, 15 Oct 2012 08:22:39 +0100
From: "Jan Beulich" <JBeulich@...e.com>
To: "Matt Fleming" <matt.fleming@...el.com>
Cc: <mingo@...nel.org>, <x86@...nel.org>, <mjg@...hat.com>,
<linux-efi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<hpa@...or.com>
Subject: Re: [PATCH 1/3] x86, mm: Include the entire kernel memory map
in trampoline_pgd
>>> On 10.10.12 at 12:45, Matt Fleming <matt.fleming@...el.com> wrote:
> On Thu, 2012-10-04 at 11:01 +0100, Jan Beulich wrote:
>> >>> On 04.10.12 at 11:18, Matt Fleming <matt.fleming@...el.com> wrote:
>> > On Thu, 2012-10-04 at 07:32 +0100, Jan Beulich wrote:
>> >> Btw., once this set of yours is in - will I need to resubmit the
>> >> time handling patch that actually triggered this work, or will
>> >> you just reinstate it without further action on my part?
>> >
>> > It's up to you. If you don't want to make any changes to your original
>> > patch then I'll just re-apply it on top of this series, updating the
>> > commit log to note why it got reverted and why it's now OK to re-apply.
>>
>> Afaict no changes should be necessary (so long as the patch
>> still applies).
>
> How does this look?
Perfectly fine - thanks!
Jan
> Matthew do you still want your Acked-by to be applied?
>
> ---
>
> From 194b1acd3f39e479c484a4aba50e034a2b58e0d6 Mon Sep 17 00:00:00 2001
> From: Jan Beulich <JBeulich@...e.com>
> Date: Fri, 25 May 2012 16:20:31 +0100
> Subject: [PATCH] x86-64/efi: Use EFI to deal with platform wall clock
> (again)
>
> Other than ix86, x86-64 on EFI so far didn't set the
> {g,s}et_wallclock accessors to the EFI routines, thus
> incorrectly using raw RTC accesses instead.
>
> Simply removing the #ifdef around the respective code isn't
> enough, however: While so far early get-time calls were done in
> physical mode, this doesn't work properly for x86-64, as virtual
> addresses would still need to be set up for all runtime regions
> (which wasn't the case on the system I have access to), so
> instead the patch moves the call to efi_enter_virtual_mode()
> ahead (which in turn allows to drop all code related to calling
> efi-get-time in physical mode).
>
> Additionally the earlier calling of efi_set_executable()
> requires the CPA code to cope, i.e. during early boot it must be
> avoided to call cpa_flush_array(), as the first thing this
> function does is a BUG_ON(irqs_disabled()).
>
> Also make the two EFI functions in question here static -
> they're not being referenced elsewhere.
>
> History:
>
> This commit was originally merged as bacef661acdb ("x86-64/efi:
> Use EFI to deal with platform wall clock") but it resulted in some
> ASUS machines no longer booting due to a firmware bug, and so was
> reverted in f026cfa82f62. A pre-emptive fix for the buggy ASUS
> firmware was merged in 03a1c254975e ("x86, efi: 1:1 pagetable
> mapping for virtual EFI calls") so now this patch can be
> reapplied.
>
> Signed-off-by: Jan Beulich <jbeulich@...e.com>
> Tested-by: Matt Fleming <matt.fleming@...el.com>
> Acked-by: Matthew Garrett <mjg@...hat.com>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Cc: H. Peter Anvin <hpa@...or.com>
> Signed-off-by: Matt Fleming <matt.fleming@...el.com> [added commit history]
> ---
> arch/x86/mm/pageattr.c | 10 ++++++----
> arch/x86/platform/efi/efi.c | 30 ++++--------------------------
> include/linux/efi.h | 2 --
> init/main.c | 8 ++++----
> 4 files changed, 14 insertions(+), 36 deletions(-)
>
> diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
> index a718e0d..931930a 100644
> --- a/arch/x86/mm/pageattr.c
> +++ b/arch/x86/mm/pageattr.c
> @@ -919,11 +919,13 @@ static int change_page_attr_set_clr(unsigned long
> *addr, int numpages,
>
> /*
> * On success we use clflush, when the CPU supports it to
> - * avoid the wbindv. If the CPU does not support it and in the
> - * error case we fall back to cpa_flush_all (which uses
> - * wbindv):
> + * avoid the wbindv. If the CPU does not support it, in the
> + * error case, and during early boot (for EFI) we fall back
> + * to cpa_flush_all (which uses wbinvd):
> */
> - if (!ret && cpu_has_clflush) {
> + if (early_boot_irqs_disabled)
> + __cpa_flush_all((void *)(long)cache);
> + else if (!ret && cpu_has_clflush) {
> if (cpa.flags & (CPA_PAGES_ARRAY | CPA_ARRAY)) {
> cpa_flush_array(addr, numpages, cache,
> cpa.flags, pages);
> diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
> index aded2a9..7578344 100644
> --- a/arch/x86/platform/efi/efi.c
> +++ b/arch/x86/platform/efi/efi.c
> @@ -235,22 +235,7 @@ static efi_status_t __init
> phys_efi_set_virtual_address_map(
> return status;
> }
>
> -static efi_status_t __init phys_efi_get_time(efi_time_t *tm,
> - efi_time_cap_t *tc)
> -{
> - unsigned long flags;
> - efi_status_t status;
> -
> - spin_lock_irqsave(&rtc_lock, flags);
> - efi_call_phys_prelog();
> - status = efi_call_phys2(efi_phys.get_time, virt_to_phys(tm),
> - virt_to_phys(tc));
> - efi_call_phys_epilog();
> - spin_unlock_irqrestore(&rtc_lock, flags);
> - return status;
> -}
> -
> -int efi_set_rtc_mmss(unsigned long nowtime)
> +static int efi_set_rtc_mmss(unsigned long nowtime)
> {
> int real_seconds, real_minutes;
> efi_status_t status;
> @@ -279,7 +264,7 @@ int efi_set_rtc_mmss(unsigned long nowtime)
> return 0;
> }
>
> -unsigned long efi_get_time(void)
> +static unsigned long efi_get_time(void)
> {
> efi_status_t status;
> efi_time_t eft;
> @@ -635,18 +620,13 @@ static int __init efi_runtime_init(void)
> }
> /*
> * We will only need *early* access to the following
> - * two EFI runtime services before set_virtual_address_map
> + * EFI runtime service before set_virtual_address_map
> * is invoked.
> */
> - efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
> efi_phys.set_virtual_address_map =
> (efi_set_virtual_address_map_t *)
> runtime->set_virtual_address_map;
> - /*
> - * Make efi_get_time can be called before entering
> - * virtual mode.
> - */
> - efi.get_time = phys_efi_get_time;
> +
> early_iounmap(runtime, sizeof(efi_runtime_services_t));
>
> return 0;
> @@ -734,12 +714,10 @@ void __init efi_init(void)
> efi_enabled = 0;
> return;
> }
> -#ifdef CONFIG_X86_32
> if (efi_native) {
> x86_platform.get_wallclock = efi_get_time;
> x86_platform.set_wallclock = efi_set_rtc_mmss;
> }
> -#endif
>
> #if EFI_DEBUG
> print_efi_memmap();
> diff --git a/include/linux/efi.h b/include/linux/efi.h
> index 337aefb..5e2308d 100644
> --- a/include/linux/efi.h
> +++ b/include/linux/efi.h
> @@ -516,8 +516,6 @@ extern u64 efi_mem_attribute (unsigned long phys_addr,
> unsigned long size);
> extern int __init efi_uart_console_only (void);
> extern void efi_initialize_iomem_resources(struct resource *code_resource,
> struct resource *data_resource, struct resource *bss_resource);
> -extern unsigned long efi_get_time(void);
> -extern int efi_set_rtc_mmss(unsigned long nowtime);
> extern void efi_reserve_boot_services(void);
> extern struct efi_memory_map memmap;
>
> diff --git a/init/main.c b/init/main.c
> index db34c0e..5297109 100644
> --- a/init/main.c
> +++ b/init/main.c
> @@ -461,6 +461,10 @@ static void __init mm_init(void)
> percpu_init_late();
> pgtable_cache_init();
> vmalloc_init();
> +#ifdef CONFIG_X86
> + if (efi_enabled)
> + efi_enter_virtual_mode();
> +#endif
> }
>
> asmlinkage void __init start_kernel(void)
> @@ -602,10 +606,6 @@ asmlinkage void __init start_kernel(void)
> calibrate_delay();
> pidmap_init();
> anon_vma_init();
> -#ifdef CONFIG_X86
> - if (efi_enabled)
> - efi_enter_virtual_mode();
> -#endif
> thread_info_cache_init();
> cred_init();
> fork_init(totalram_pages);
> --
> 1.7.11.4
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