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Message-ID: <17434cbf-2947-3c1b-d5b7-0ad9f5392fa8@amd.com>
Date: Thu, 18 Dec 2025 10:42:45 -0800
From: Lizhi Hou <lizhi.hou@....com>
To: Mario Limonciello <superm1@...nel.org>, <ogabbay@...nel.org>,
<quic_jhugo@...cinc.com>, <dri-devel@...ts.freedesktop.org>,
<maciej.falkowski@...ux.intel.com>
CC: <linux-kernel@...r.kernel.org>, <max.zhen@....com>, <sonal.santan@....com>
Subject: Re: [PATCH V2] accel/amdxdna: Enable temporal sharing only mode
Applied to drm-misc-next
On 12/17/25 11:14, Mario Limonciello wrote:
> On 12/17/25 1:11 PM, Lizhi Hou wrote:
>> Newer firmware versions prefer temporal sharing only mode. In this mode,
>> the driver no longer needs to manage AIE array column allocation.
>> Instead,
>> a new field, num_unused_col, is added to the hardware context creation
>> request to specify how many columns will not be used by this hardware
>> context.
>>
>> Signed-off-by: Lizhi Hou <lizhi.hou@....com>
>
> Reviewed-by: Mario Limonciello (AMD) <superm1@...nel.org>
>
> One minor whitespace comment below (just fix it while committing if no
> other feedback).
>
>> ---
>> drivers/accel/amdxdna/aie2_ctx.c | 18 +++++++++++++++---
>> drivers/accel/amdxdna/aie2_message.c | 1 +
>> drivers/accel/amdxdna/aie2_msg_priv.h | 3 ++-
>> drivers/accel/amdxdna/aie2_pci.h | 1 +
>> drivers/accel/amdxdna/amdxdna_ctx.h | 1 +
>> drivers/accel/amdxdna/npu4_regs.c | 1 +
>> 6 files changed, 21 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/accel/amdxdna/aie2_ctx.c
>> b/drivers/accel/amdxdna/aie2_ctx.c
>> index 42d876a427c5..f99233041397 100644
>> --- a/drivers/accel/amdxdna/aie2_ctx.c
>> +++ b/drivers/accel/amdxdna/aie2_ctx.c
>> @@ -468,6 +468,12 @@ static int aie2_alloc_resource(struct
>> amdxdna_hwctx *hwctx)
>> struct alloc_requests *xrs_req;
>> int ret;
>> + if (AIE2_FEATURE_ON(xdna->dev_handle, AIE2_TEMPORAL_ONLY)) {
>> + hwctx->num_unused_col = xdna->dev_handle->total_col -
>> hwctx->num_col;
>> + hwctx->num_col = xdna->dev_handle->total_col;
>> + return aie2_create_context(xdna->dev_handle, hwctx);
>> + }
>> +
>> xrs_req = kzalloc(sizeof(*xrs_req), GFP_KERNEL);
>> if (!xrs_req)
>> return -ENOMEM;
>> @@ -499,9 +505,15 @@ static void aie2_release_resource(struct
>> amdxdna_hwctx *hwctx)
>> struct amdxdna_dev *xdna = hwctx->client->xdna;
>> int ret;
>> - ret = xrs_release_resource(xdna->xrs_hdl, (uintptr_t)hwctx);
>> - if (ret)
>> - XDNA_ERR(xdna, "Release AIE resource failed, ret %d", ret);
>> + if (AIE2_FEATURE_ON(xdna->dev_handle, AIE2_TEMPORAL_ONLY)) {
>> + ret = aie2_destroy_context(xdna->dev_handle, hwctx);
>> + if (ret)
>> + XDNA_ERR(xdna, "Destroy temporal only context failed,
>> ret %d", ret);
>
> too much whitespace inbetween destroy and temporal.
>
>> + } else {
>> + ret = xrs_release_resource(xdna->xrs_hdl, (uintptr_t)hwctx);
>> + if (ret)
>> + XDNA_ERR(xdna, "Release AIE resource failed, ret %d", ret);
>> + }
>> }
>> static int aie2_ctx_syncobj_create(struct amdxdna_hwctx *hwctx)
>> diff --git a/drivers/accel/amdxdna/aie2_message.c
>> b/drivers/accel/amdxdna/aie2_message.c
>> index 9ec973028221..e77a353cadc5 100644
>> --- a/drivers/accel/amdxdna/aie2_message.c
>> +++ b/drivers/accel/amdxdna/aie2_message.c
>> @@ -218,6 +218,7 @@ int aie2_create_context(struct amdxdna_dev_hdl
>> *ndev, struct amdxdna_hwctx *hwct
>> req.aie_type = 1;
>> req.start_col = hwctx->start_col;
>> req.num_col = hwctx->num_col;
>> + req.num_unused_col = hwctx->num_unused_col;
>> req.num_cq_pairs_requested = 1;
>> req.pasid = hwctx->client->pasid;
>> req.context_priority = 2;
>> diff --git a/drivers/accel/amdxdna/aie2_msg_priv.h
>> b/drivers/accel/amdxdna/aie2_msg_priv.h
>> index 1c957a6298d3..cc912b7899ce 100644
>> --- a/drivers/accel/amdxdna/aie2_msg_priv.h
>> +++ b/drivers/accel/amdxdna/aie2_msg_priv.h
>> @@ -112,7 +112,8 @@ struct create_ctx_req {
>> __u32 aie_type;
>> __u8 start_col;
>> __u8 num_col;
>> - __u16 reserved;
>> + __u8 num_unused_col;
>> + __u8 reserved;
>> __u8 num_cq_pairs_requested;
>> __u8 reserved1;
>> __u16 pasid;
>> diff --git a/drivers/accel/amdxdna/aie2_pci.h
>> b/drivers/accel/amdxdna/aie2_pci.h
>> index c6b5cf4ae5c4..a929fa98a121 100644
>> --- a/drivers/accel/amdxdna/aie2_pci.h
>> +++ b/drivers/accel/amdxdna/aie2_pci.h
>> @@ -232,6 +232,7 @@ struct aie2_hw_ops {
>> enum aie2_fw_feature {
>> AIE2_NPU_COMMAND,
>> AIE2_PREEMPT,
>> + AIE2_TEMPORAL_ONLY,
>> AIE2_FEATURE_MAX
>> };
>> diff --git a/drivers/accel/amdxdna/amdxdna_ctx.h
>> b/drivers/accel/amdxdna/amdxdna_ctx.h
>> index b6151244d64f..b29449a92f60 100644
>> --- a/drivers/accel/amdxdna/amdxdna_ctx.h
>> +++ b/drivers/accel/amdxdna/amdxdna_ctx.h
>> @@ -98,6 +98,7 @@ struct amdxdna_hwctx {
>> u32 *col_list;
>> u32 start_col;
>> u32 num_col;
>> + u32 num_unused_col;
>> #define HWCTX_STAT_INIT 0
>> #define HWCTX_STAT_READY 1
>> #define HWCTX_STAT_STOP 2
>> diff --git a/drivers/accel/amdxdna/npu4_regs.c
>> b/drivers/accel/amdxdna/npu4_regs.c
>> index 4ca21db70478..a62234fd266d 100644
>> --- a/drivers/accel/amdxdna/npu4_regs.c
>> +++ b/drivers/accel/amdxdna/npu4_regs.c
>> @@ -90,6 +90,7 @@ const struct dpm_clk_freq npu4_dpm_clk_table[] = {
>> const struct aie2_fw_feature_tbl npu4_fw_feature_table[] = {
>> { .feature = AIE2_NPU_COMMAND, .min_minor = 15 },
>> { .feature = AIE2_PREEMPT, .min_minor = 12 },
>> + { .feature = AIE2_TEMPORAL_ONLY, .min_minor = 12 },
>> { 0 }
>> };
>
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