linux-kernel - Re: [PATCH 4.9 111/111] MIPS: VDSO: Drop gic_get_usm

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Date:   Tue, 25 Sep 2018 11:38:16 +0800
From:   SZ Lin (林上智) <sz.lin@...a.com>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, stable <stable@...r.kernel.org>,
        paul.burton@...tec.com, jason@...edaemon.net, marc.zyngier@....com,
        tglx@...utronix.de, linux-mips@...ux-mips.org, ralf@...ux-mips.org,
        SZ Lin <sz.lin@...a.com>
Subject: Re: [PATCH 4.9 111/111] MIPS: VDSO: Drop gic_get_usm_range() usage

Hi,

Guenter Roeck <linux@...ck-us.net> 於 2018年9月25日 週二 上午9:36寫道：
>
> On Mon, Sep 24, 2018 at 01:53:18PM +0200, Greg Kroah-Hartman wrote:
> > 4.9-stable review patch.  If anyone has any objections, please let me know.
> >
>
> This patch breaks v4.4.y and v4.9.y builds.
> It includes asm/mips-cps.h which doesn't exist in those releases.

I am sorry for my fault, thanks for your report.

Since the patch b025d51873d5fe6 "MIPS: CM: Specify register size when
generating accessors" which created asm/mips-cps.h is not a bug-fixed
patch, hence I will not backport this header.

Hi Greg,

Could you please help to revert this commit? This commit was intended
to fix dependency of 70d7783 "MIPS: VDSO: Match data page cache
colouring when D$ aliases", but I saw 70d7783 was merged before this
commit; therefore, I don't think it is necessary to keep this commit.

I apology for any inconvenience caused, and I will be more careful next time.

SZ Lin (林上智)

>
> Building mips:malta_defconfig:smp:initrd ... failed
> ------------
> Error log:
> arch/mips/kernel/vdso.c:23:26: fatal error: asm/mips-cps.h: No such file or directory
>
> Guenter
>
> > ------------------
> >
> > From: Paul Burton <paul.burton@...tec.com>
> >
> > commit 00578cd864d45ae4b8fa3f684f8d6f783dd8d15d upstream.
> >
> > We don't really need gic_get_usm_range() to abstract discovery of the
> > address of the GIC user-visible section now that we have access to its
> > base address globally.
> >
> > Switch to calculating it ourselves, which will allow us to stop
> > requiring the irqchip driver to care about a counter exposed to userland
> > for use via the VDSO.
> >
> > Signed-off-by: Paul Burton <paul.burton@...tec.com>
> > Cc: Jason Cooper <jason@...edaemon.net>
> > Cc: Marc Zyngier <marc.zyngier@....com>
> > Cc: Thomas Gleixner <tglx@...utronix.de>
> > Cc: linux-mips@...ux-mips.org
> > Patchwork: https://patchwork.linux-mips.org/patch/17040/
> > Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>
> > Signed-off-by: SZ Lin (林上智) <sz.lin@...a.com>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > ---
> >  arch/mips/kernel/vdso.c |   15 +++++----------
> >  1 file changed, 5 insertions(+), 10 deletions(-)
> >
> > --- a/arch/mips/kernel/vdso.c
> > +++ b/arch/mips/kernel/vdso.c
> > @@ -13,7 +13,6 @@
> >  #include <linux/err.h>
> >  #include <linux/init.h>
> >  #include <linux/ioport.h>
> > -#include <linux/irqchip/mips-gic.h>
> >  #include <linux/kernel.h>
> >  #include <linux/mm.h>
> >  #include <linux/sched.h>
> > @@ -21,6 +20,7 @@
> >  #include <linux/timekeeper_internal.h>
> >
> >  #include <asm/abi.h>
> > +#include <asm/mips-cps.h>
> >  #include <asm/page.h>
> >  #include <asm/vdso.h>
> >
> > @@ -101,9 +101,8 @@ int arch_setup_additional_pages(struct l
> >  {
> >       struct mips_vdso_image *image = current->thread.abi->vdso;
> >       struct mm_struct *mm = current->mm;
> > -     unsigned long gic_size, vvar_size, size, base, data_addr, vdso_addr;
> > +     unsigned long gic_size, vvar_size, size, base, data_addr, vdso_addr, gic_pfn;
> >       struct vm_area_struct *vma;
> > -     struct resource gic_res;
> >       int ret;
> >
> >       if (down_write_killable(&mm->mmap_sem))
> > @@ -127,7 +126,7 @@ int arch_setup_additional_pages(struct l
> >        * only map a page even though the total area is 64K, as we only need
> >        * the counter registers at the start.
> >        */
> > -     gic_size = gic_present ? PAGE_SIZE : 0;
> > +     gic_size = mips_gic_present() ? PAGE_SIZE : 0;
> >       vvar_size = gic_size + PAGE_SIZE;
> >       size = vvar_size + image->size;
> >
> > @@ -168,13 +167,9 @@ int arch_setup_additional_pages(struct l
> >
> >       /* Map GIC user page. */
> >       if (gic_size) {
> > -             ret = gic_get_usm_range(&gic_res);
> > -             if (ret)
> > -                     goto out;
> > +             gic_pfn = virt_to_phys(mips_gic_base + MIPS_GIC_USER_OFS) >> PAGE_SHIFT;
> >
> > -             ret = io_remap_pfn_range(vma, base,
> > -                                      gic_res.start >> PAGE_SHIFT,
> > -                                      gic_size,
> > +             ret = io_remap_pfn_range(vma, base, gic_pfn, gic_size,
> >                                        pgprot_noncached(PAGE_READONLY));
> >               if (ret)
> >                       goto out;
> >
> >