On 6/13/2018 3:54 AM, Andy Shevchenko wrote:
>> + /* Calling Interface SMI
>
> I suppose the style of the comments like
> /*
> * Calling ...
> ...
Yes... goof on my part. Thanks.
>> + *
>> + * Provide physical address of command buffer field within
>> + * the struct smi_cmd... can't use virt_to_phys on smi_cmd
>> + * because address may be from memremap.
>
> Wait, memremap() might return a virtual address. How we be sure that
> we got still physical address here?
>
> (Also note () when referring to functions)
>
>> + */
>> + smi_cmd->ebx = smi_data_buf_phys_addr +
>> + offsetof(struct smi_cmd, command_buffer);
>
> Btw, can it be one line (~83 character are okay for my opinion).
>
Before this patch, the address in smi_cmd always came from an alloc, so
virt_to_phys() was used to get the physical address here. With WSMT, we
could be using a BIOS-provided buffer for SMI, in which case the address in
smi_cmd will come from memremap(), so we can't use virt_to_phys() on it.
So instead I changed this to use the physical address of smi_data_buf that
is stored in smi_data_buf_phys_addr, which will be valid regardless of how
the address of smi_data_buf was generated.
But that would be like 97 characters long if I made it all one line...
>> + acpi_get_table(ACPI_SIG_WSMT, 0, (struct acpi_table_header **)&wsmt);
>> + if (!wsmt)
>> + return 0;
>> +
>> + /* Check if WSMT ACPI table shows that protection is enabled */
>> + if (!(wsmt->protection_flags & ACPI_WSMT_FIXED_COMM_BUFFERS)
>
>> + || !(wsmt->protection_flags
>> + & ACPI_WSMT_COMM_BUFFER_NESTED_PTR_PROTECTION))
>
> Better to indent like
>
> if (... ||
> !(... & ...)
>
Yes thanks.
>> + return 0;
>> +
>> + /* Scan for EPS (entry point structure) */
>> + for (addr = (u8 *)__va(0xf0000);
>> + addr < (u8 *)__va(0x100000 - sizeof(struct smm_eps_table));
>
>> + addr += 1) {
>
> This wasn't commented IIRC and changed. So, why?
>
I changed this is response to your earlier comment (7 june)... you had pointed
out that it would be better if I put an "if (eps) break;" inside the for loop
instead of having "&& !eps" in the condition of the for loop. I put the note
"Changed loop searching 0xf0000 to be more readable" in the list of changes for
patch version v3 to cover this change.
Thanks again for your time!
