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Message-ID: <aaee2e99-d19b-466b-92fb-837093e574b0@amd.com>
Date: Wed, 18 Sep 2024 10:44:40 -0500
From: Mario Limonciello <mario.limonciello@....com>
To: "Luke D. Jones" <luke@...nes.dev>, platform-driver-x86@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, hdegoede@...hat.com,
ilpo.jarvinen@...ux.intel.com, corentin.chary@...il.com
Subject: Re: [PATCH v3 3/5] platform/x86: asus-armoury: add apu-mem control
support
On 9/18/2024 04:42, Luke D. Jones wrote:
> Implement the APU memory size control under the asus-armoury module using
> the fw_attributes class.
>
> This allows the APU allocated memory size to be adjusted depending on
> the users priority. A reboot is required after change.
>
> Signed-off-by: Luke D. Jones <luke@...nes.dev>
> ---
> drivers/platform/x86/asus-armoury.c | 114 +++++++++++++++++++++
> include/linux/platform_data/x86/asus-wmi.h | 1 +
> 2 files changed, 115 insertions(+)
>
> diff --git a/drivers/platform/x86/asus-armoury.c b/drivers/platform/x86/asus-armoury.c
> index 176ab5f105dd..b276c42f98d8 100644
> --- a/drivers/platform/x86/asus-armoury.c
> +++ b/drivers/platform/x86/asus-armoury.c
> @@ -456,6 +456,119 @@ static ssize_t egpu_enable_current_value_store(struct kobject *kobj, struct kobj
> WMI_SHOW_INT(egpu_enable_current_value, "%d\n", ASUS_WMI_DEVID_EGPU);
> ATTR_GROUP_BOOL_CUSTOM(egpu_enable, "egpu_enable", "Enable the eGPU (also disables dGPU)");
>
> +/* Device memory available to APU */
> +
> +static ssize_t apu_mem_current_value_show(struct kobject *kobj, struct kobj_attribute *attr,
> + char *buf)
> +{
> + int err;
> + u32 mem;
> +
> + err = asus_wmi_get_devstate_dsts(ASUS_WMI_DEVID_APU_MEM, &mem);
> + if (err)
> + return err;
> +
> + switch (mem) {
> + case 256:
> + mem = 0;
> + break;
> + case 258:
> + mem = 1;
> + break;
> + case 259:
> + mem = 2;
> + break;
> + case 260:
> + mem = 3;
> + break;
> + case 261:
> + mem = 4;
> + break;
> + case 262:
> + /* This is out of order and looks wrong but is correct */
> + mem = 8;
> + break;
> + case 263:
> + mem = 5;
> + break;
> + case 264:
> + mem = 6;
> + break;
> + case 265:
> + mem = 7;
> + break;
> + default:
> + mem = 4;
> + break;
> + }
> +
> + return sysfs_emit(buf, "%u\n", mem);
> +}
> +
> +static ssize_t apu_mem_current_value_store(struct kobject *kobj, struct kobj_attribute *attr,
> + const char *buf, size_t count)
> +{
> + int result, err;
> + u32 requested, mem;
> +
> + result = kstrtou32(buf, 10, &requested);
> + if (result)
> + return result;
> +
> + switch (requested) {
> + case 0:
> + mem = 0;
> + break;
> + case 1:
> + mem = 258;
> + break;
> + case 2:
> + mem = 259;
> + break;
> + case 3:
> + mem = 260;
> + break;
> + case 4:
> + mem = 261;
> + break;
> + case 5:
> + mem = 263;
> + break;
> + case 6:
> + mem = 264;
> + break;
> + case 7:
> + mem = 265;
> + break;
> + case 8:
> + /* This is out of order and looks wrong but is correct */
> + mem = 262;
> + break;
> + default:
> + return -EIO;
> + }
> +
> + err = asus_wmi_set_devstate(ASUS_WMI_DEVID_APU_MEM, mem, &result);
> + if (err) {
> + pr_warn("Failed to set apu_mem: %d\n", err);
> + return err;
> + }
> +
> + pr_info("APU memory changed to %uGB, reboot required\n", requested);
This doesn't seem right. If you requested "0", you just set APU memory
to 0GB?
> + sysfs_notify(kobj, NULL, attr->attr.name);
> +
> + asus_set_reboot_and_signal_event();
> +
> + return count;
> +}
> +
> +static ssize_t apu_mem_possible_values_show(struct kobject *kobj, struct kobj_attribute *attr,
> + char *buf)
> +{
> + return sysfs_emit(buf, "0;1;2;3;4;5;6;7;8\n");
What exactly is the unit for 0-8? It's obviously not a a multiple of
base memory, is it a multiple of an adder?
Is this changing the VRAM allocation? Like does 0 mean 256MB, 1 is 512 etc?
> +}
> +ATTR_GROUP_ENUM_CUSTOM(apu_mem, "apu_mem", "Set the available system memory for the APU to use");
> +
> /* Simple attribute creation */
> ATTR_GROUP_ROG_TUNABLE(ppt_pl1_spl, "ppt_pl1_spl", ASUS_WMI_DEVID_PPT_PL1_SPL, cpu_default,
> cpu_min, cpu_max, 1, "Set the CPU slow package limit");
> @@ -511,6 +624,7 @@ static const struct asus_attr_group armoury_attr_groups[] = {
> { &nv_temp_target_attr_group, ASUS_WMI_DEVID_NV_THERM_TARGET },
> { &dgpu_base_tgp_attr_group, ASUS_WMI_DEVID_DGPU_BASE_TGP },
> { &dgpu_tgp_attr_group, ASUS_WMI_DEVID_DGPU_SET_TGP },
> + { &apu_mem_attr_group, ASUS_WMI_DEVID_APU_MEM },
>
> { &charge_mode_attr_group, ASUS_WMI_DEVID_CHARGE_MODE },
> { &boot_sound_attr_group, ASUS_WMI_DEVID_BOOT_SOUND },
> diff --git a/include/linux/platform_data/x86/asus-wmi.h b/include/linux/platform_data/x86/asus-wmi.h
> index 86629e621c61..e1aeafdf05d5 100644
> --- a/include/linux/platform_data/x86/asus-wmi.h
> +++ b/include/linux/platform_data/x86/asus-wmi.h
> @@ -136,6 +136,7 @@
>
> #define ASUS_WMI_DEVID_DGPU_BASE_TGP 0x00120099
> #define ASUS_WMI_DEVID_DGPU_SET_TGP 0x00120098
> +#define ASUS_WMI_DEVID_APU_MEM 0x000600C1
>
> /* gpu mux switch, 0 = dGPU, 1 = Optimus */
> #define ASUS_WMI_DEVID_GPU_MUX 0x00090016
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