Dear Matt, Thank you for reviewing. I updated my patchset. I'm happy if you review new one. Sincerely, Taku Izumi > -----Original Message----- > From: Matt Fleming [mailto:matt@xxxxxxxxxxxxxxxxxxx] > Sent: Wednesday, August 26, 2015 8:46 AM > To: Izumi, Taku/泉 拓 > Cc: linux-kernel@xxxxxxxxxxxxxxx; linux-efi@xxxxxxxxxxxxxxx; x86@xxxxxxxxxx; matt.fleming@xxxxxxxxx; > tglx@xxxxxxxxxxxxx; mingo@xxxxxxxxxx; hpa@xxxxxxxxx; tony.luck@xxxxxxxxx; qiuxishi@xxxxxxxxxx; Kamezawa, Hiroyuki/亀 > 澤 寛之 > Subject: Re: [PATCH 2/2] x86, efi: Add "efi_fake_mem_mirror" boot option > > On Fri, 21 Aug, at 02:16:00AM, Taku Izumi wrote: > > This patch introduces new boot option named "efi_fake_mem_mirror". > > By specifying this parameter, you can mark specific memory as > > mirrored memory. This is useful for debugging of Address Range > > Mirroring feature. > > > > For example, if you specify "efi_fake_mem_mirror=2G@4G,2G@0x10a0000000", > > the original (firmware provided) EFI memmap will be updated so that > > the specified memory regions have EFI_MEMORY_MORE_RELIABLE attribute: > > > > <original EFI memmap> > > efi: mem00: [Boot Data | | | | | | |WB|WT|WC|UC] range=[0x0000000000000000-0x0000000000001000) > (0MB) > > efi: mem01: [Loader Data | | | | | | |WB|WT|WC|UC] range=[0x0000000000001000-0x0000000000002000) > (0MB) > > ... > > efi: mem35: [Boot Data | | | | | | |WB|WT|WC|UC] range=[0x0000000047ee6000-0x0000000048014000) > (1MB) > > efi: mem36: [Conventional Memory| | | | | | |WB|WT|WC|UC] range=[0x0000000100000000-0x00000020a0000000) > (129536MB) > > efi: mem37: [Reserved |RUN| | | | | | | | |UC] range=[0x0000000060000000-0x0000000090000000) > (768MB) > > > > <updated EFI memmap> > > efi: mem00: [Boot Data | | | | | | |WB|WT|WC|UC] range=[0x0000000000000000-0x0000000000001000) > (0MB) > > efi: mem01: [Loader Data | | | | | | |WB|WT|WC|UC] range=[0x0000000000001000-0x0000000000002000) > (0MB) > > ... > > efi: mem35: [Boot Data | | | | | | |WB|WT|WC|UC] range=[0x0000000047ee6000-0x0000000048014000) > (1MB) > > efi: mem36: [Conventional Memory| |RELY| | | | |WB|WT|WC|UC] range=[0x0000000100000000-0x0000000180000000) > (2048MB) > > efi: mem37: [Conventional Memory| | | | | | |WB|WT|WC|UC] range=[0x0000000180000000-0x00000010a0000000) > (61952MB) > > efi: mem38: [Conventional Memory| |RELY| | | | |WB|WT|WC|UC] range=[0x00000010a0000000-0x0000001120000000) > (2048MB) > > efi: mem39: [Conventional Memory| | | | | | |WB|WT|WC|UC] range=[0x0000001120000000-0x00000020a0000000) > (63488MB) > > efi: mem40: [Reserved |RUN| | | | | | | | |UC] range=[0x0000000060000000-0x0000000090000000) > (768MB) > > > > And you will find that the following message is output: > > > > efi: Memory: 4096M/131455M mirrored memory > > > > Signed-off-by: Taku Izumi <izumi.taku@xxxxxxxxxxxxxx> > > --- > > Documentation/kernel-parameters.txt | 8 ++ > > arch/x86/include/asm/efi.h | 2 + > > arch/x86/kernel/setup.c | 4 +- > > arch/x86/platform/efi/efi.c | 2 +- > > arch/x86/platform/efi/quirks.c | 169 ++++++++++++++++++++++++++++++++++++ > > 5 files changed, 183 insertions(+), 2 deletions(-) > > [...] > > > diff --git a/arch/x86/platform/efi/quirks.c b/arch/x86/platform/efi/quirks.c > > index 1c7380d..5c785e1 100644 > > --- a/arch/x86/platform/efi/quirks.c > > +++ b/arch/x86/platform/efi/quirks.c > > @@ -18,6 +18,10 @@ > > > > The quirks file isn't intended to be used for this kind of feature. > It's very much a repository for workarounds for quirky firmware, i.e. > known bugs. > > Instead, how about putting all this into a new fake_mem.c file? Going > further than that, there's nothing that I can see that looks > particularly x86-specific, so how about sticking all this in > drivers/firmware/efi/fake_mem.c so that the arm64 folks can make use > of it if/when they want to start playing around with > EFI_MEMORY_MORE_RELIABLE? > > > static efi_char16_t efi_dummy_name[6] = { 'D', 'U', 'M', 'M', 'Y', 0 }; > > > > +#define EFI_MAX_FAKE_MIRROR 8 > > +static struct range fake_mirrors[EFI_MAX_FAKE_MIRROR]; > > +static int num_fake_mirror; > > + > > static bool efi_no_storage_paranoia; > > > > /* > > @@ -288,3 +292,168 @@ bool efi_poweroff_required(void) > > { > > return !!acpi_gbl_reduced_hardware; > > } > > + > > +void __init efi_fake_memmap(void) > > +{ > > + efi_memory_desc_t *md; > > + void *p, *q; > > + int i; > > + int nr_map = memmap.nr_map; > > + u64 start, end, m_start, m_end; > > + u64 new_memmap_phy; > > + void *new_memmap; > > + > > + if (!num_fake_mirror) > > + return; > > + > > + /* count up the number of EFI memory descriptor */ > > + for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) { > > + md = p; > > + start = md->phys_addr; > > + end = start + (md->num_pages << EFI_PAGE_SHIFT) - 1; > > + > > + for (i = 0; i < num_fake_mirror; i++) { > > + /* mirroring range */ > > + m_start = fake_mirrors[i].start; > > + m_end = fake_mirrors[i].end; > > + > > + if (m_start <= start) { > > + /* split into 2 parts */ > > + if (start < m_end && m_end < end) > > + nr_map++; > > + } > > + if (start < m_start && m_start < end) { > > + /* split into 3 parts */ > > + if (m_end < end) > > + nr_map += 2; > > + /* split into 2 parts */ > > + if (end <= m_end) > > + nr_map++; > > + } > > + } > > + } > > + > > + /* allocate memory for new EFI memmap */ > > + new_memmap_phy = memblock_alloc(memmap.desc_size * nr_map, PAGE_SIZE); > > + if (!new_memmap_phy) > > + return; > > + > > + /* create new EFI memmap */ > > + new_memmap = early_memremap(new_memmap_phy, memmap.desc_size * nr_map); > > + for (p = memmap.map, q = new_memmap; > > + p < memmap.map_end; > > + p += memmap.desc_size, q += memmap.desc_size) { > > Can we rename 'p' and 'q', 'old' and 'new'? Otherwise it gets a little > tricky to follow the below code. > > > -- > Matt Fleming, Intel Open Source Technology Center -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
