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([10.239.96.51]) by fmviesa004.fm.intel.com with ESMTP; 21 Aug 2025 01:52:08 -0700 From: Yi Sun To: vkoul@kernel.org Cc: vinicius.gomes@intel.com, dave.jiang@intel.com, dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, yi.sun@intel.com, gordon.jin@intel.com, fenghuay@nvidia.com, yi1.lai@intel.com, Anil S Keshavamurthy Subject: [PATCH v3 1/2] dmaengine: idxd: Expose DSA3.0 capabilities through sysfs Date: Thu, 21 Aug 2025 16:51:10 +0800 Message-ID: <20250821085111.1430076-2-yi.sun@intel.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250821085111.1430076-1-yi.sun@intel.com> References: <20250821085111.1430076-1-yi.sun@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Introduce sysfs interfaces for 3 new Data Streaming Accelerator (DSA) capability registers (dsacap0-2) to enable userspace awareness of hardware features in DSA version 3 and later devices. Userspace components (e.g. configure libraries, workload Apps) require this information to: 1. Select optimal data transfer strategies based on SGL capabilities 2. Enable hardware-specific optimizations for floating-point operations 3. Configure memory operations with proper numerical handling 4. Verify compute operation compatibility before submitting jobs The output format is ,,, where each DSA capability value is a 64-bit hexadecimal number, separated by commas. The ordering follows the DSA 3.0 specification layout: Offset: 0x190 0x188 0x180 Reg: dsacap2 dsacap1 dsacap0 Example: cat /sys/bus/dsa/devices/dsa0/dsacaps 000000000000f18d,0014000e000007aa,00fa01ff01ff03ff According to the DSA 3.0 specification, there are 15 fields defined for the three dsacap registers. However, there's no need to define all register structures unless a use case requires them. At this point, support for the Scatter-Gather List (SGL) located in dsacap0 is necessary, so only dsacap0 is defined accordingly. For reference, the DSA 3.0 specification is available at: Link: https://software.intel.com/content/www/us/en/develop/articles/intel-d= ata-streaming-accelerator-architecture-specification.html Signed-off-by: Yi Sun Co-developed-by: Anil S Keshavamurthy Signed-off-by: Anil S Keshavamurthy Reviewed-by: Dave Jiang Tested-by: Yi Lai Acked-by: Vinicius Costa Gomes diff --git a/Documentation/ABI/stable/sysfs-driver-dma-idxd b/Documentation= /ABI/stable/sysfs-driver-dma-idxd index 4a355e6747ae..bd281063d626 100644 --- a/Documentation/ABI/stable/sysfs-driver-dma-idxd +++ b/Documentation/ABI/stable/sysfs-driver-dma-idxd @@ -136,6 +136,21 @@ Description: The last executed device administrative c= ommand's status/error. Also last configuration error overloaded. Writing to it will clear the status. =20 +What: /sys/bus/dsa/devices/dsa/dsacaps +Date: Oct 5, 2025 +KernelVersion: 6.17.0 +Contact: dmaengine@vger.kernel.org +Description: The DSA3 specification introduces three new capability + registers: dsacap[0-2]. User components (e.g., configuration + libraries and workload applications) require this information + to properly utilize the DSA3 features. + This includes SGL capability support, Enabling hardware-specific + optimizations, Configuring memory, etc. + The output format is ',,' where each + DSA cap value is a 64 bit hex value. + This attribute should only be visible on DSA devices of version + 3 or later. + What: /sys/bus/dsa/devices/dsa/iaa_cap Date: Sept 14, 2022 KernelVersion: 6.0.0 diff --git a/drivers/dma/idxd/idxd.h b/drivers/dma/idxd/idxd.h index 74e6695881e6..cc0a3fe1c957 100644 --- a/drivers/dma/idxd/idxd.h +++ b/drivers/dma/idxd/idxd.h @@ -252,6 +252,9 @@ struct idxd_hw { struct opcap opcap; u32 cmd_cap; union iaa_cap_reg iaa_cap; + union dsacap0_reg dsacap0; + union dsacap1_reg dsacap1; + union dsacap2_reg dsacap2; }; =20 enum idxd_device_state { diff --git a/drivers/dma/idxd/init.c b/drivers/dma/idxd/init.c index 35bdefd3728b..084df60d407b 100644 --- a/drivers/dma/idxd/init.c +++ b/drivers/dma/idxd/init.c @@ -582,6 +582,12 @@ static void idxd_read_caps(struct idxd_device *idxd) } multi_u64_to_bmap(idxd->opcap_bmap, &idxd->hw.opcap.bits[0], 4); =20 + if (idxd->hw.version >=3D DEVICE_VERSION_3) { + idxd->hw.dsacap0.bits =3D ioread64(idxd->reg_base + IDXD_DSACAP0_OFFSET); + idxd->hw.dsacap1.bits =3D ioread64(idxd->reg_base + IDXD_DSACAP1_OFFSET); + idxd->hw.dsacap2.bits =3D ioread64(idxd->reg_base + IDXD_DSACAP2_OFFSET); + } + /* read iaa cap */ if (idxd->data->type =3D=3D IDXD_TYPE_IAX && idxd->hw.version >=3D DEVICE= _VERSION_2) idxd->hw.iaa_cap.bits =3D ioread64(idxd->reg_base + IDXD_IAACAP_OFFSET); diff --git a/drivers/dma/idxd/registers.h b/drivers/dma/idxd/registers.h index 9c1c546fe443..439bbc311591 100644 --- a/drivers/dma/idxd/registers.h +++ b/drivers/dma/idxd/registers.h @@ -13,6 +13,7 @@ =20 #define DEVICE_VERSION_1 0x100 #define DEVICE_VERSION_2 0x200 +#define DEVICE_VERSION_3 0x300 =20 #define IDXD_MMIO_BAR 0 #define IDXD_WQ_BAR 2 @@ -582,6 +583,30 @@ union evl_status_reg { u64 bits; }; =20 +#define IDXD_DSACAP0_OFFSET 0x180 +union dsacap0_reg { + u64 bits; + struct { + u64 max_sgl_shift:4; + u64 max_gr_block_shift:4; + u64 ops_inter_domain:7; + u64 rsvd1:17; + u64 sgl_formats:16; + u64 max_sg_process:8; + u64 rsvd2:8; + }; +}; + +#define IDXD_DSACAP1_OFFSET 0x188 +union dsacap1_reg { + u64 bits; +}; + +#define IDXD_DSACAP2_OFFSET 0x190 +union dsacap2_reg { + u64 bits; +}; + #define IDXD_MAX_BATCH_IDENT 256 =20 struct __evl_entry { diff --git a/drivers/dma/idxd/sysfs.c b/drivers/dma/idxd/sysfs.c index 9f0701021af0..cc2c83d7f710 100644 --- a/drivers/dma/idxd/sysfs.c +++ b/drivers/dma/idxd/sysfs.c @@ -1713,6 +1713,18 @@ static ssize_t event_log_size_store(struct device *d= ev, } static DEVICE_ATTR_RW(event_log_size); =20 +static ssize_t dsacaps_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct idxd_device *idxd =3D confdev_to_idxd(dev); + + return sysfs_emit(buf, "%016llx,%016llx,%016llx\n", + (u64)idxd->hw.dsacap2.bits, + (u64)idxd->hw.dsacap1.bits, + (u64)idxd->hw.dsacap0.bits); +} +static DEVICE_ATTR_RO(dsacaps); + static bool idxd_device_attr_max_batch_size_invisible(struct attribute *at= tr, struct idxd_device *idxd) { @@ -1750,6 +1762,14 @@ static bool idxd_device_attr_event_log_size_invisibl= e(struct attribute *attr, !idxd->hw.gen_cap.evl_support); } =20 +static bool idxd_device_attr_dsacaps_invisible(struct attribute *attr, + struct idxd_device *idxd) +{ + return attr =3D=3D &dev_attr_dsacaps.attr && + (idxd->data->type !=3D IDXD_TYPE_DSA || + idxd->hw.version < DEVICE_VERSION_3); +} + static umode_t idxd_device_attr_visible(struct kobject *kobj, struct attribute *attr, int n) { @@ -1768,6 +1788,9 @@ static umode_t idxd_device_attr_visible(struct kobjec= t *kobj, if (idxd_device_attr_event_log_size_invisible(attr, idxd)) return 0; =20 + if (idxd_device_attr_dsacaps_invisible(attr, idxd)) + return 0; + return attr->mode; } =20 @@ -1795,6 +1818,7 @@ static struct attribute *idxd_device_attributes[] =3D= { &dev_attr_cmd_status.attr, &dev_attr_iaa_cap.attr, &dev_attr_event_log_size.attr, + &dev_attr_dsacaps.attr, NULL, }; =20 --=20 2.43.0 From nobody Sat Oct 4 01:44:58 2025 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.14]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7D8AD2EBDF2; 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([10.239.96.51]) by fmviesa004.fm.intel.com with ESMTP; 21 Aug 2025 01:52:22 -0700 From: Yi Sun To: vkoul@kernel.org Cc: vinicius.gomes@intel.com, dave.jiang@intel.com, dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, yi.sun@intel.com, gordon.jin@intel.com, fenghuay@nvidia.com, yi1.lai@intel.com, Anil S Keshavamurthy Subject: [PATCH v3 2/2] dmaengine: idxd: Add Max SGL Size Support for DSA3.0 Date: Thu, 21 Aug 2025 16:51:11 +0800 Message-ID: <20250821085111.1430076-3-yi.sun@intel.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250821085111.1430076-1-yi.sun@intel.com> References: <20250821085111.1430076-1-yi.sun@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Certain DSA 3.0 opcodes, such as Gather copy and Gather reduce, require max SGL configured for workqueues prior to supporting these opcodes. Configure the maximum scatter-gather list (SGL) size for workqueues during setup on the supported HW. Application can then properly handle the SGL size without explicitly setting it. Signed-off-by: Yi Sun Co-developed-by: Anil S Keshavamurthy Signed-off-by: Anil S Keshavamurthy Reviewed-by: Dave Jiang Tested-by: Yi Lai Acked-by: Vinicius Costa Gomes diff --git a/drivers/dma/idxd/device.c b/drivers/dma/idxd/device.c index 5cf419fe6b46..1c10b030bea7 100644 --- a/drivers/dma/idxd/device.c +++ b/drivers/dma/idxd/device.c @@ -375,6 +375,7 @@ static void idxd_wq_disable_cleanup(struct idxd_wq *wq) memset(wq->name, 0, WQ_NAME_SIZE); wq->max_xfer_bytes =3D WQ_DEFAULT_MAX_XFER; idxd_wq_set_max_batch_size(idxd->data->type, wq, WQ_DEFAULT_MAX_BATCH); + idxd_wq_set_init_max_sgl_size(idxd, wq); if (wq->opcap_bmap) bitmap_copy(wq->opcap_bmap, idxd->opcap_bmap, IDXD_MAX_OPCAP_BITS); } @@ -974,6 +975,8 @@ static int idxd_wq_config_write(struct idxd_wq *wq) /* bytes 12-15 */ wq->wqcfg->max_xfer_shift =3D ilog2(wq->max_xfer_bytes); idxd_wqcfg_set_max_batch_shift(idxd->data->type, wq->wqcfg, ilog2(wq->max= _batch_size)); + if (idxd_sgl_supported(idxd)) + wq->wqcfg->max_sgl_shift =3D ilog2(wq->max_sgl_size); =20 /* bytes 32-63 */ if (idxd->hw.wq_cap.op_config && wq->opcap_bmap) { @@ -1152,6 +1155,8 @@ static int idxd_wq_load_config(struct idxd_wq *wq) =20 wq->max_xfer_bytes =3D 1ULL << wq->wqcfg->max_xfer_shift; idxd_wq_set_max_batch_size(idxd->data->type, wq, 1U << wq->wqcfg->max_bat= ch_shift); + if (idxd_sgl_supported(idxd)) + wq->max_sgl_size =3D 1U << wq->wqcfg->max_sgl_shift; =20 for (i =3D 0; i < WQCFG_STRIDES(idxd); i++) { wqcfg_offset =3D WQCFG_OFFSET(idxd, wq->id, i); diff --git a/drivers/dma/idxd/idxd.h b/drivers/dma/idxd/idxd.h index cc0a3fe1c957..ea8c4daed38d 100644 --- a/drivers/dma/idxd/idxd.h +++ b/drivers/dma/idxd/idxd.h @@ -227,6 +227,7 @@ struct idxd_wq { char name[WQ_NAME_SIZE + 1]; u64 max_xfer_bytes; u32 max_batch_size; + u32 max_sgl_size; =20 /* Lock to protect upasid_xa access. */ struct mutex uc_lock; @@ -348,6 +349,7 @@ struct idxd_device { =20 u64 max_xfer_bytes; u32 max_batch_size; + u32 max_sgl_size; int max_groups; int max_engines; int max_rdbufs; @@ -692,6 +694,20 @@ static inline void idxd_wq_set_max_batch_size(int idxd= _type, struct idxd_wq *wq, wq->max_batch_size =3D max_batch_size; } =20 +static bool idxd_sgl_supported(struct idxd_device *idxd) +{ + return idxd->data->type =3D=3D IDXD_TYPE_DSA && + idxd->hw.version >=3D DEVICE_VERSION_3 && + idxd->hw.dsacap0.sgl_formats; +} + +static inline void idxd_wq_set_init_max_sgl_size(struct idxd_device *idxd, + struct idxd_wq *wq) +{ + if (idxd_sgl_supported(idxd)) + wq->max_sgl_size =3D 1U << idxd->hw.dsacap0.max_sgl_shift; +} + static inline void idxd_wqcfg_set_max_batch_shift(int idxd_type, union wqc= fg *wqcfg, u32 max_batch_shift) { diff --git a/drivers/dma/idxd/init.c b/drivers/dma/idxd/init.c index 084df60d407b..395d5486aee6 100644 --- a/drivers/dma/idxd/init.c +++ b/drivers/dma/idxd/init.c @@ -217,6 +217,7 @@ static int idxd_setup_wqs(struct idxd_device *idxd) init_completion(&wq->wq_resurrect); wq->max_xfer_bytes =3D WQ_DEFAULT_MAX_XFER; idxd_wq_set_max_batch_size(idxd->data->type, wq, WQ_DEFAULT_MAX_BATCH); + idxd_wq_set_init_max_sgl_size(idxd, wq); wq->enqcmds_retries =3D IDXD_ENQCMDS_RETRIES; wq->wqcfg =3D kzalloc_node(idxd->wqcfg_size, GFP_KERNEL, dev_to_node(dev= )); if (!wq->wqcfg) { @@ -587,6 +588,10 @@ static void idxd_read_caps(struct idxd_device *idxd) idxd->hw.dsacap1.bits =3D ioread64(idxd->reg_base + IDXD_DSACAP1_OFFSET); idxd->hw.dsacap2.bits =3D ioread64(idxd->reg_base + IDXD_DSACAP2_OFFSET); } + if (idxd_sgl_supported(idxd)) { + idxd->max_sgl_size =3D 1U << idxd->hw.dsacap0.max_sgl_shift; + dev_dbg(dev, "max sgl size: %u\n", idxd->max_sgl_size); + } =20 /* read iaa cap */ if (idxd->data->type =3D=3D IDXD_TYPE_IAX && idxd->hw.version >=3D DEVICE= _VERSION_2) diff --git a/drivers/dma/idxd/registers.h b/drivers/dma/idxd/registers.h index 439bbc311591..c5f344c55a69 100644 --- a/drivers/dma/idxd/registers.h +++ b/drivers/dma/idxd/registers.h @@ -385,7 +385,8 @@ union wqcfg { /* bytes 12-15 */ u32 max_xfer_shift:5; u32 max_batch_shift:4; - u32 rsvd4:23; + u32 max_sgl_shift:4; + u32 rsvd4:19; =20 /* bytes 16-19 */ u16 occupancy_inth; --=20 2.43.0