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Message-ID: <0f16dd5a-bce7-0e36-3827-f713e90fb843@infradead.org>
Date: Fri, 18 Aug 2023 16:04:08 -0700
From: Randy Dunlap <rdunlap@...radead.org>
To: Devaraj Rangasamy <Devaraj.Rangasamy@....com>,
Jonathan Corbet <corbet@....net>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
"H . Peter Anvin" <hpa@...or.com>,
Jens Wiklander <jens.wiklander@...aro.org>,
Sumit Garg <sumit.garg@...aro.org>,
"Paul E . McKenney" <paulmck@...nel.org>,
Catalin Marinas <catalin.marinas@....com>,
Peter Zijlstra <peterz@...radead.org>,
Steven Rostedt <rostedt@...dmis.org>,
Daniel Sneddon <daniel.sneddon@...ux.intel.com>,
Rijo Thomas <Rijo-john.Thomas@....com>,
SivaSangeetha SK <SivaSangeetha.SK@....com>,
Josh Poimboeuf <jpoimboe@...nel.org>,
Juergen Gross <jgross@...e.com>,
Ard Biesheuvel <ardb@...nel.org>,
Ross Lagerwall <ross.lagerwall@...rix.com>,
Yuntao Wang <ytcoode@...il.com>,
Sean Christopherson <seanjc@...gle.com>,
Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
Herbert Xu <herbert@...dor.apana.org.au>,
Tom Lendacky <thomas.lendacky@....com>,
Mario Limonciello <mario.limonciello@....com>,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
op-tee@...ts.trustedfirmware.org
Cc: Mythri PK <Mythri.Pandeshwarakrishna@....com>,
Nimesh Easow <Nimesh.Easow@....com>
Subject: Re: [PATCH] tee: amdtee: add support for use of cma region
Hi--
On 8/18/23 07:42, Devaraj Rangasamy wrote:
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 722b6eca2e93..5e38423f3d53 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -363,6 +363,13 @@
> selects a performance level in this range and appropriate
> to the current workload.
>
> + amdtee_cma=nn [HW,TEE]
> + Sets the memory size reserved for contiguous memory
> + allocations, to be used by amdtee device driver.
> + Value is in MB and can range from 4 to 128 (MBs)
128 (MBs).
> + CMA will be active only when CMA is enabled, and amdtee is
That could use some improvement. How about:
AMD-TEE CMA will be active only when CONFIG_CMA is enabled,
and amdtee is
> + built as inbuilt driver, and not loaded as module.
> +
> amijoy.map= [HW,JOY] Amiga joystick support
> Map of devices attached to JOY0DAT and JOY1DAT
> Format: <a>,<b>
> diff --git a/drivers/tee/amdtee/Kconfig b/drivers/tee/amdtee/Kconfig
> index 191f9715fa9a..5843c739a7b8 100644
> --- a/drivers/tee/amdtee/Kconfig
> +++ b/drivers/tee/amdtee/Kconfig
> @@ -6,3 +6,12 @@ config AMDTEE
> depends on CRYPTO_DEV_SP_PSP && CRYPTO_DEV_CCP_DD
> help
> This implements AMD's Trusted Execution Environment (TEE) driver.
> +
> +config AMDTEE_CMA_SIZE
> + int "Size of Memory in MiB reserved in CMA for AMD-TEE"
> + default "0"
Why won't this default value cause an allocation error message?
Maybe I'm just not following the call paths correctly.
It looks to me like this causes a call to
cma_declare_contiguous_nid() with @size = 0, and that function says:
if (!size)
return -EINVAL;
> + depends on CMA && (AMDTEE=y)
> + help
> + Specify the default amount of memory in MiB reserved in CMA for AMD-TEE driver
driver.
> + Any amdtee shm buffer allocation larger than 64k will allocate memory from the CMA
CMA.
> + The default can be overridden with the kernel commandline parameter "amdtee_cma".
> \ No newline at end of file
Please fix that ^^^ warning.
Thanks.
--
~Randy
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