[U-Boot] [PATCH V3 15/27] imx8m: Fix MMU table issue for OPTEE memory
Peng Fan
peng.fan at nxp.com
Thu Mar 5 11:46:12 CET 2020
> Subject: Re: [U-Boot] [PATCH V3 15/27] imx8m: Fix MMU table issue for
> OPTEE memory
>
> Hi Peng,
>
> On Thu, Mar 5, 2020 at 2:50 AM Peng Fan <peng.fan at nxp.com> wrote:
> >
> > > Subject: Re: [U-Boot] [PATCH V3 15/27] imx8m: Fix MMU table issue
> > > for OPTEE memory
> > >
> > > Hi Peng,
> > >
> > > On Tue, Aug 27, 2019 at 9:38 AM Peng Fan <peng.fan at nxp.com> wrote:
> > > >
> > > > When running with OPTEE, the MMU table in u-boot does not remove
> > > > the OPTEE memory from its settings. So ARM speculative prefetch in
> > > > u-boot may access that OPTEE memory. Due to trust zone is enabled
> > > > by OPTEE and that memory is set to secure access, then the
> > > > speculative prefetch will fail and cause various memory issue in u-boot.
> > > > The fail address register and int_status register in trustzone has
> > > > logged that speculative access from u-boot.
> > > >
> > > > Signed-off-by: Peng Fan <peng.fan at nxp.com>
> > > > ---
> > > > arch/arm/mach-imx/imx8m/soc.c | 20 ++++++++++++++++++--
> > > > 1 file changed, 18 insertions(+), 2 deletions(-)
> > > >
> > > > diff --git a/arch/arm/mach-imx/imx8m/soc.c
> > > > b/arch/arm/mach-imx/imx8m/soc.c index 5115471eff..dd393b581b
> > > 100644
> > > > --- a/arch/arm/mach-imx/imx8m/soc.c
> > > > +++ b/arch/arm/mach-imx/imx8m/soc.c
> > > > @@ -112,16 +112,18 @@ static struct mm_region imx8m_mem_map[]
> = {
> > > > /* DRAM1 */
> > > > .virt = 0x40000000UL,
> > > > .phys = 0x40000000UL,
> > > > - .size = 0xC0000000UL,
> > > > + .size = PHYS_SDRAM_SIZE,
> > > > .attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) |
> > > > PTE_BLOCK_OUTER_SHARE
> > > > +#ifdef PHYS_SDRAM_2_SIZE
> > > > }, {
> > > > /* DRAM2 */
> > > > .virt = 0x100000000UL,
> > > > .phys = 0x100000000UL,
> > > > - .size = 0x040000000UL,
> > > > + .size = PHYS_SDRAM_2_SIZE,
> > > > .attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) |
> > > > PTE_BLOCK_OUTER_SHARE
> > > > +#endif
> > > > }, {
> > > > /* List terminator */
> > > > 0,
> > > > @@ -130,6 +132,20 @@ static struct mm_region imx8m_mem_map[] =
> {
> > > >
> > > > struct mm_region *mem_map = imx8m_mem_map;
> > > >
> > > > +void enable_caches(void)
> > > > +{
> > > > + /*
> > > > + * If OPTEE runs, remove OPTEE memory from MMU table to
> > > > + * avoid speculative prefetch. OPTEE runs at the top of
> > > > + * the first memory bank
> > > > + */
> > > > + if (rom_pointer[1])
> > > > + imx8m_mem_map[5].size -= rom_pointer[1];
> > > > +
> > > > + icache_enable();
> > > > + dcache_enable();
> > > > +}
> > > > +
> > > > static u32 get_cpu_variant_type(u32 type) {
> > > > struct ocotp_regs *ocotp = (struct ocotp_regs
> > > > *)OCOTP_BASE_ADDR;
> > > > --
> > > > 2.16.4
> > > >
> > > > _______________________________________________
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> > > >
> > >
> s.denx.de%2Flistinfo%2Fu-boot&data=02%7C01%7Cpeng.fan%40nxp.co
> > > m%7C
> > > >
> > >
> abfc9387a622474e599508d7c049395c%7C686ea1d3bc2b4c6fa92cd99c5c30
> > > 1635%7C
> > > >
> > >
> 0%7C0%7C637189293044493841&sdata=fMrSP%2BMAzI20VMGhXm0U
> > > 6kejjaClNOo
> > > > bFjB4HVkTt%2Fs%3D&reserved=0
> > >
> > > Unfortunately, I'm still facing a similar issue when OP-TEE is
> > > loaded on iMX8MM-based module, despite BL32_BASE(0xbe000000) +
> > > BL32_SIZE(0x2000000) region is excluded.
> > > Based on debug ouput the latest one is:
> > > ....
> > > idx=2 PTE 00000000bfff7010 at level 1: bfffd003 Checking if pte fits
> > > for
> > > virt=bde00000 size=200000 blocksize=40000000
> > > addr=bde00000 level=2
> > > idx=2 PTE 00000000bfff7010 at level 1: bfffd003 idx=1ef PTE
> > > 00000000bfffdf78 at level 2: 0 Checking if pte fits for
> > > virt=bde00000
> > > size=200000 blocksize=200000 Setting PTE 00000000bfffdf78 to block
> > > virt=bde00000
> >
> > Wired. If this is true, this is bug in u-boot MMU part.
>
> Sorry fot the noise, that was wrong dram initiailization (I've forgot to take into
> account rom_pointer[1] value) The fix for my board is:
>
> diff --git a/board/toradex/verdin-imx8mm/verdin-imx8mm.c
> b/board/toradex/verdin-imx8mm/verdin-imx8mm.c
> index 16b9fa1ec1..024c0bd183 100644
> --- a/board/toradex/verdin-imx8mm/verdin-imx8mm.c
> +++ b/board/toradex/verdin-imx8mm/verdin-imx8mm.c
> @@ -5,6 +5,7 @@
>
> #include <common.h>
> #include <asm/arch/clock.h>
> +#include <asm/arch/sys_proto.h>
> #include <asm/io.h>
> #include <miiphy.h>
> #include <netdev.h>
> @@ -13,7 +14,12 @@ DECLARE_GLOBAL_DATA_PTR;
>
> int dram_init(void)
> {
> - gd->ram_size = get_ram_size((void *)PHYS_SDRAM,
> PHYS_SDRAM_SIZE);
> + /* rom_pointer[1] contains the size of TEE occupies */
> + if (rom_pointer[1])
> + gd->ram_size = PHYS_SDRAM_SIZE - rom_pointer[1];
> + else
> + gd->ram_size = PHYS_SDRAM_SIZE;
> +
>
> return 0;
> }
Indeed.
>
>
> This bug is actual for imx8mm_evk also.
Would you help submit a fix for this release?
Thanks,
Peng.
> >
> > Regards,
> > Peng.
> >
> > >
> > >
> > > U-Boot hangs just after writing to System Control Register in
> > > arch/arm/cpu/armv8/cache_v8.c:419:
> > >
> > > /* enable the mmu */
> > > set_sctlr(get_sctlr() | CR_M);
> > >
> > > In my setup mainline U-Boot/TF-A/OP-TEE are used:
> > > u-boot: 133276f14a ("Merge branch '2020-02-25-master-imports'")
> > > tf-a: 6e46981f84 ("Merge "Update pathnames in maintainers.rst file"
> > > into integration")
> > > op-tee: a67dc424ff ("ta: pkcs11: API for slot/token information")
> > >
> > > OP-TEE is compiled with these flags:
> > > CFG_ARM64_core=y
> > > CFG_NXP_CAAM=n
> > > CFG_NXPCRYPT=n
> > > PLATFORM=imx-mx8mmevk
> > > CFG_TEE_CORE_LOG_LEVEL=4
> > > DEBUG=y
> > > CFG_TEE_CORE_DEBUG=y
> > >
> > > With DCACHE disabled obviously everything works. Also I don't face
> > > any issues if TF-A is compiled without SPD=opteed.
> > >
> > > Maybe it rings the bell and you already saw similar issues before?
> > >
> > > Thanks
> > >
> > > --
> > > Best regards - Freundliche Grüsse - Meilleures salutations
> > >
> > > Igor Opaniuk
> > >
> > > mailto: igor.opaniuk at gmail.com
> > > skype: igor.opanyuk
> > > +380 (93) 836 40 67
> > > https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fua.
> > > linke
> > >
> din.com%2Fin%2Fiopaniuk&data=02%7C01%7Cpeng.fan%40nxp.com%7
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> > > fbL%2FGn2H%2FBilRgKeQe5CHaUt0BjKP4%3D&reserved=0
>
>
>
> --
> Best regards - Freundliche Grüsse - Meilleures salutations
>
> Igor Opaniuk
>
> mailto: igor.opaniuk at gmail.com
> skype: igor.opanyuk
> +380 (93) 836 40 67
> https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fua.linke
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