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Date: Fri, 10 Sep 2021 14:54:46 +0100
From: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To: Jia He <justin.he@....com>
Cc: Will Deacon <will@...nel.org>, Len Brown <lenb@...nel.org>,
Robert Moore <robert.moore@...el.com>,
Erik Kaneda <erik.kaneda@...el.com>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linux-acpi@...r.kernel.org, devel@...ica.org,
Ard Biesheuvel <ardb@...nel.org>,
Hanjun Guo <guohanjun@...wei.com>,
Catalin Marinas <catalin.marinas@....com>,
"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
harb@...erecomputing.com
Subject: Re: [PATCH] Revert "ACPI: Add memory semantics to
acpi_os_map_memory()"
[dropped CC stable, +CC Harb]
On Fri, Sep 10, 2021 at 08:28:20PM +0800, Jia He wrote:
> This reverts commit 437b38c51162f8b87beb28a833c4d5dc85fa864e.
>
> After this commit, a boot panic is alway hit on an Ampere EMAG server
> with call trace as follows:
> Internal error: synchronous external abort: 96000410 [#1] SMP
> Modules linked in:
> CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.14.0+ #462
> Hardware name: MiTAC RAPTOR EV-883832-X3-0001/RAPTOR, BIOS 0.14 02/22/2019
> pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> [...snip...]
> Call trace:
> acpi_ex_system_memory_space_handler+0x26c/0x2c8
> acpi_ev_address_space_dispatch+0x228/0x2c4
> acpi_ex_access_region+0x114/0x268
> acpi_ex_field_datum_io+0x128/0x1b8
> acpi_ex_extract_from_field+0x14c/0x2ac
> acpi_ex_read_data_from_field+0x190/0x1b8
> acpi_ex_resolve_node_to_value+0x1ec/0x288
> acpi_ex_resolve_to_value+0x250/0x274
> acpi_ds_evaluate_name_path+0xac/0x124
> acpi_ds_exec_end_op+0x90/0x410
> acpi_ps_parse_loop+0x4ac/0x5d8
> acpi_ps_parse_aml+0xe0/0x2c8
> acpi_ps_execute_method+0x19c/0x1ac
> acpi_ns_evaluate+0x1f8/0x26c
> acpi_ns_init_one_device+0x104/0x140
> acpi_ns_walk_namespace+0x158/0x1d0
> acpi_ns_initialize_devices+0x194/0x218
> acpi_initialize_objects+0x48/0x50
> acpi_init+0xe0/0x498
>
> From the debugging, we're mapping something which is *not* described by
> the EFI memory map, but *does* want PROT_NORMAL_NC.
"Does not" you mean. We are forcing memory semantics mappings to
PROT_NORMAL_NC, which eMAG does not like at all and I'd need to
understand why.
It looks like the issue happen in SystemMemory Opregion handler.
>
> Hence just revert it before everything is clear.
>
> Fixes: 437b38c51162 ("ACPI: Add memory semantics to acpi_os_map_memory()")
> Cc: stable@...r.kernel.org
No need, it is not even in an -rc yet (and stable should not be CCed in
the addressees CC list).
Thanks,
Lorenzo
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
> Cc: Ard Biesheuvel <ardb@...nel.org>
> Cc: Hanjun Guo <guohanjun@...wei.com>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>
> Signed-off-by: Jia He <justin.he@....com>
> ---
> arch/arm64/include/asm/acpi.h | 3 ---
> arch/arm64/kernel/acpi.c | 19 +++----------------
> drivers/acpi/osl.c | 23 +++++++----------------
> include/acpi/acpi_io.h | 8 --------
> 4 files changed, 10 insertions(+), 43 deletions(-)
>
> diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
> index 7535dc7cc5aa..bd68e1b7f29f 100644
> --- a/arch/arm64/include/asm/acpi.h
> +++ b/arch/arm64/include/asm/acpi.h
> @@ -50,9 +50,6 @@ pgprot_t __acpi_get_mem_attribute(phys_addr_t addr);
> void __iomem *acpi_os_ioremap(acpi_physical_address phys, acpi_size size);
> #define acpi_os_ioremap acpi_os_ioremap
>
> -void __iomem *acpi_os_memmap(acpi_physical_address phys, acpi_size size);
> -#define acpi_os_memmap acpi_os_memmap
> -
> typedef u64 phys_cpuid_t;
> #define PHYS_CPUID_INVALID INVALID_HWID
>
> diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
> index 1c9c2f7a1c04..f3851724fe35 100644
> --- a/arch/arm64/kernel/acpi.c
> +++ b/arch/arm64/kernel/acpi.c
> @@ -273,8 +273,7 @@ pgprot_t __acpi_get_mem_attribute(phys_addr_t addr)
> return __pgprot(PROT_DEVICE_nGnRnE);
> }
>
> -static void __iomem *__acpi_os_ioremap(acpi_physical_address phys,
> - acpi_size size, bool memory)
> +void __iomem *acpi_os_ioremap(acpi_physical_address phys, acpi_size size)
> {
> efi_memory_desc_t *md, *region = NULL;
> pgprot_t prot;
> @@ -300,11 +299,9 @@ static void __iomem *__acpi_os_ioremap(acpi_physical_address phys,
> * It is fine for AML to remap regions that are not represented in the
> * EFI memory map at all, as it only describes normal memory, and MMIO
> * regions that require a virtual mapping to make them accessible to
> - * the EFI runtime services. Determine the region default
> - * attributes by checking the requested memory semantics.
> + * the EFI runtime services.
> */
> - prot = memory ? __pgprot(PROT_NORMAL_NC) :
> - __pgprot(PROT_DEVICE_nGnRnE);
> + prot = __pgprot(PROT_DEVICE_nGnRnE);
> if (region) {
> switch (region->type) {
> case EFI_LOADER_CODE:
> @@ -364,16 +361,6 @@ static void __iomem *__acpi_os_ioremap(acpi_physical_address phys,
> return __ioremap(phys, size, prot);
> }
>
> -void __iomem *acpi_os_ioremap(acpi_physical_address phys, acpi_size size)
> -{
> - return __acpi_os_ioremap(phys, size, false);
> -}
> -
> -void __iomem *acpi_os_memmap(acpi_physical_address phys, acpi_size size)
> -{
> - return __acpi_os_ioremap(phys, size, true);
> -}
> -
> /*
> * Claim Synchronous External Aborts as a firmware first notification.
> *
> diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
> index a43f1521efe6..45c5c0e45e33 100644
> --- a/drivers/acpi/osl.c
> +++ b/drivers/acpi/osl.c
> @@ -284,8 +284,7 @@ acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
> #define should_use_kmap(pfn) page_is_ram(pfn)
> #endif
>
> -static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz,
> - bool memory)
> +static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)
> {
> unsigned long pfn;
>
> @@ -295,8 +294,7 @@ static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz,
> return NULL;
> return (void __iomem __force *)kmap(pfn_to_page(pfn));
> } else
> - return memory ? acpi_os_memmap(pg_off, pg_sz) :
> - acpi_os_ioremap(pg_off, pg_sz);
> + return acpi_os_ioremap(pg_off, pg_sz);
> }
>
> static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
> @@ -311,10 +309,9 @@ static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
> }
>
> /**
> - * __acpi_os_map_iomem - Get a virtual address for a given physical address range.
> + * acpi_os_map_iomem - Get a virtual address for a given physical address range.
> * @phys: Start of the physical address range to map.
> * @size: Size of the physical address range to map.
> - * @memory: true if remapping memory, false if IO
> *
> * Look up the given physical address range in the list of existing ACPI memory
> * mappings. If found, get a reference to it and return a pointer to it (its
> @@ -324,8 +321,8 @@ static void acpi_unmap(acpi_physical_address pg_off, void __iomem *vaddr)
> * During early init (when acpi_permanent_mmap has not been set yet) this
> * routine simply calls __acpi_map_table() to get the job done.
> */
> -static void __iomem __ref
> -*__acpi_os_map_iomem(acpi_physical_address phys, acpi_size size, bool memory)
> +void __iomem __ref
> +*acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
> {
> struct acpi_ioremap *map;
> void __iomem *virt;
> @@ -356,7 +353,7 @@ static void __iomem __ref
>
> pg_off = round_down(phys, PAGE_SIZE);
> pg_sz = round_up(phys + size, PAGE_SIZE) - pg_off;
> - virt = acpi_map(phys, size, memory);
> + virt = acpi_map(phys, size);
> if (!virt) {
> mutex_unlock(&acpi_ioremap_lock);
> kfree(map);
> @@ -375,17 +372,11 @@ static void __iomem __ref
> mutex_unlock(&acpi_ioremap_lock);
> return map->virt + (phys - map->phys);
> }
> -
> -void __iomem *__ref
> -acpi_os_map_iomem(acpi_physical_address phys, acpi_size size)
> -{
> - return __acpi_os_map_iomem(phys, size, false);
> -}
> EXPORT_SYMBOL_GPL(acpi_os_map_iomem);
>
> void *__ref acpi_os_map_memory(acpi_physical_address phys, acpi_size size)
> {
> - return (void *)__acpi_os_map_iomem(phys, size, true);
> + return (void *)acpi_os_map_iomem(phys, size);
> }
> EXPORT_SYMBOL_GPL(acpi_os_map_memory);
>
> diff --git a/include/acpi/acpi_io.h b/include/acpi/acpi_io.h
> index a0212e67d6f4..027faa8883aa 100644
> --- a/include/acpi/acpi_io.h
> +++ b/include/acpi/acpi_io.h
> @@ -14,14 +14,6 @@ static inline void __iomem *acpi_os_ioremap(acpi_physical_address phys,
> }
> #endif
>
> -#ifndef acpi_os_memmap
> -static inline void __iomem *acpi_os_memmap(acpi_physical_address phys,
> - acpi_size size)
> -{
> - return ioremap_cache(phys, size);
> -}
> -#endif
> -
> extern bool acpi_permanent_mmap;
>
> void __iomem __ref
> --
> 2.17.1
>
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