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Message-ID: <0e7b4bc5-92e1-4589-bb15-a1bc63abc8b4@nvidia.com>
Date: Thu, 3 Oct 2024 11:46:00 +0800
From: Koba Ko <kobak@...dia.com>
To: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: Matt Ochs <mochs@...dia.com>, Len Brown <lenb@...nel.org>,
linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
Zhang Rui <rui.zhang@...el.com>, linux-efi <linux-efi@...r.kernel.org>
Subject: Re: [PATCH V5] acpi/prmt: find block with specific type
On 10/3/24 02:05, Rafael J. Wysocki wrote:
> External email: Use caution opening links or attachments
>
>
> On Wed, Sep 11, 2024 at 5:55 PM KobaK <kobak@...dia.com> wrote:
>> PRMT needs to find the correct type of block to
>> translate the PA-VA mapping for EFI runtime services.
>>
>> The issue arises because the PRMT is finding a block of
>> type EFI_CONVENTIONAL_MEMORY, which is not appropriate for
>> runtime services as described in Section 2.2.2 (Runtime
>> Services) of the UEFI Specification [1]. Since the PRM handler is
>> a type of runtime service, this causes an exception
>> when the PRM handler is called.
>>
>> [Firmware Bug]: Unable to handle paging request in EFI runtime service
>> WARNING: CPU: 22 PID: 4330 at drivers/firmware/efi/runtime-wrappers.c:341
>> __efi_queue_work+0x11c/0x170
>> Call trace:
>> __efi_queue_work+0x11c/0x170
>> efi_call_acpi_prm_handler+0x68/0xd0
>> acpi_platformrt_space_handler+0x198/0x258
>> acpi_ev_address_space_dispatch+0x144/0x388
>> acpi_ex_access_region+0x9c/0x118
>> acpi_ex_write_serial_bus+0xc4/0x218
>> acpi_ex_write_data_to_field+0x168/0x218
>> acpi_ex_store_object_to_node+0x1a8/0x258
>> acpi_ex_store+0xec/0x330
>> acpi_ex_opcode_1A_1T_1R+0x15c/0x618
>> acpi_ds_exec_end_op+0x274/0x548
>> acpi_ps_parse_loop+0x10c/0x6b8
>> acpi_ps_parse_aml+0x140/0x3b0
>> acpi_ps_execute_method+0x12c/0x2a0
>> acpi_ns_evaluate+0x210/0x310
>> acpi_evaluate_object+0x178/0x358
>> acpi_proc_write+0x1a8/0x8a0 [acpi_call]
>> proc_reg_write+0xcc/0x150
>> vfs_write+0xd8/0x380
>> ksys_write+0x70/0x120
>> __arm64_sys_write+0x24/0x48
>> invoke_syscall.constprop.0+0x80/0xf8
>> do_el0_svc+0x50/0x110
>> el0_svc+0x48/0x1d0
>> el0t_64_sync_handler+0x15c/0x178
>> el0t_64_sync+0x1a8/0x1b0
>>
>> Find a block with specific type to fix this.
>> prmt find a block with EFI_RUNTIME_SERVICES_DATA for prm handler and
>> find a block with EFI_RUNTIME_SERVICES_CODE for prm context.
>> If no suitable block is found, a warning message will be prompted
>> but the procedue continues to manage the next prm handler.
>> However, if the prm handler is actullay called without proper allocation,
>> it would result in a failure during error handling.
>>
>> By using the correct memory types for runtime services,
>> Ensure that the PRM handler and the context are
>> properly mapped in the virtual address space during runtime,
>> preventing the paging request error.
>>
>> [1] https://uefi.org/sites/default/files/resources/UEFI_Spec_2_10_Aug29.pdf
> I need input from EFI people on this, so can you please resend the
> patch with a CC to linux-efi@...r.kernel.org?
Ok, i will CC in next push
>> Fixes: cefc7ca46235 ("ACPI: PRM: implement OperationRegion handler for the PlatformRtMechanism subtype")
>> Signed-off-by: KobaK <kobak@...dia.com>
>> Reviewed-by: Matthew R. Ochs <mochs@...dia.com>
>> ---
>> V2:
>> 1. format the changelog and add more about error handling.
>> 2. replace goto
>> V3: Warn if parts of handler are missed during va-pa translating.
>> V4: Fix the 0day
>> V5: Fix typo and pr_warn warning
>> ---
>> drivers/acpi/prmt.c | 49 +++++++++++++++++++++++++++++++--------------
>> 1 file changed, 34 insertions(+), 15 deletions(-)
>>
>> diff --git a/drivers/acpi/prmt.c b/drivers/acpi/prmt.c
>> index c78453c74ef5..cd4a7f5491d6 100644
>> --- a/drivers/acpi/prmt.c
>> +++ b/drivers/acpi/prmt.c
>> @@ -72,15 +72,17 @@ struct prm_module_info {
>> struct prm_handler_info handlers[] __counted_by(handler_count);
>> };
>>
>> -static u64 efi_pa_va_lookup(u64 pa)
>> +static u64 efi_pa_va_lookup(u64 pa, u32 type)
>> {
>> efi_memory_desc_t *md;
>> u64 pa_offset = pa & ~PAGE_MASK;
>> u64 page = pa & PAGE_MASK;
>>
>> for_each_efi_memory_desc(md) {
>> - if (md->phys_addr < pa && pa < md->phys_addr + PAGE_SIZE * md->num_pages)
>> + if ((md->type == type) &&
>> + (md->phys_addr < pa && pa < md->phys_addr + PAGE_SIZE * md->num_pages)) {
>> return pa_offset + md->virt_addr + page - md->phys_addr;
>> + }
>> }
>>
>> return 0;
>> @@ -148,9 +150,18 @@ acpi_parse_prmt(union acpi_subtable_headers *header, const unsigned long end)
>> th = &tm->handlers[cur_handler];
>>
>> guid_copy(&th->guid, (guid_t *)handler_info->handler_guid);
>> - th->handler_addr = (void *)efi_pa_va_lookup(handler_info->handler_address);
>> - th->static_data_buffer_addr = efi_pa_va_lookup(handler_info->static_data_buffer_address);
>> - th->acpi_param_buffer_addr = efi_pa_va_lookup(handler_info->acpi_param_buffer_address);
>> + th->handler_addr =
>> + (void *)efi_pa_va_lookup(handler_info->handler_address, EFI_RUNTIME_SERVICES_CODE);
>> + th->static_data_buffer_addr =
>> + efi_pa_va_lookup(handler_info->static_data_buffer_address, EFI_RUNTIME_SERVICES_DATA);
>> + th->acpi_param_buffer_addr =
>> + efi_pa_va_lookup(handler_info->acpi_param_buffer_address, EFI_RUNTIME_SERVICES_DATA);
>> +
>> + if (!th->handler_addr || !th->static_data_buffer_addr || !th->acpi_param_buffer_addr)
>> + pr_warn(
>> + "Idx: %llu, Parts of handler(GUID: %pUL) are missed, handler_addr %p, data_addr %p, param_addr %p",
>> + cur_handler, &th->guid, th->handler_addr,
>> + (void *)th->static_data_buffer_addr, (void *)th->acpi_param_buffer_addr);
>> } while (++cur_handler < tm->handler_count && (handler_info = get_next_handler(handler_info)));
>>
>> return 0;
>> @@ -250,8 +261,16 @@ static acpi_status acpi_platformrt_space_handler(u32 function,
>>
>> handler = find_prm_handler(&buffer->handler_guid);
>> module = find_prm_module(&buffer->handler_guid);
>> - if (!handler || !module)
>> - goto invalid_guid;
>> + if (!handler || !module) {
>> + buffer->prm_status = PRM_HANDLER_GUID_NOT_FOUND;
>> + return AE_OK;
>> + }
>> +
>> + if (!handler->handler_addr || !handler->static_data_buffer_addr ||
>> + !handler->acpi_param_buffer_addr) {
>> + buffer->prm_status = PRM_HANDLER_ERROR;
>> + return AE_OK;
>> + }
>>
>> ACPI_COPY_NAMESEG(context.signature, "PRMC");
>> context.revision = 0x0;
>> @@ -274,8 +293,10 @@ static acpi_status acpi_platformrt_space_handler(u32 function,
>> case PRM_CMD_START_TRANSACTION:
>>
>> module = find_prm_module(&buffer->handler_guid);
>> - if (!module)
>> - goto invalid_guid;
>> + if (!module) {
>> + buffer->prm_status = PRM_HANDLER_GUID_NOT_FOUND;
>> + return AE_OK;
>> + }
>>
>> if (module->updatable)
>> module->updatable = false;
>> @@ -286,8 +307,10 @@ static acpi_status acpi_platformrt_space_handler(u32 function,
>> case PRM_CMD_END_TRANSACTION:
>>
>> module = find_prm_module(&buffer->handler_guid);
>> - if (!module)
>> - goto invalid_guid;
>> + if (!module) {
>> + buffer->prm_status = PRM_HANDLER_GUID_NOT_FOUND;
>> + return AE_OK;
>> + }
>>
>> if (module->updatable)
>> buffer->prm_status = UPDATE_UNLOCK_WITHOUT_LOCK;
>> @@ -302,10 +325,6 @@ static acpi_status acpi_platformrt_space_handler(u32 function,
>> }
>>
>> return AE_OK;
>> -
>> -invalid_guid:
>> - buffer->prm_status = PRM_HANDLER_GUID_NOT_FOUND;
>> - return AE_OK;
>> }
>>
>> void __init init_prmt(void)
>> --
>> 2.43.0
>>
>>
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