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Mon, 02 Mar 2026 01:07:11 -0800 (PST) X-Received: by 2002:a17:90b:2507:b0:359:8230:abcc with SMTP id 98e67ed59e1d1-3598230ace5mr3362753a91.8.1772442430727; Mon, 02 Mar 2026 01:07:10 -0800 (PST) Received: from [10.206.99.28] ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3593ddd737fsm17419480a91.13.2026.03.02.01.07.03 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 02 Mar 2026 01:07:10 -0800 (PST) Message-ID: <741c681d-b496-4dff-be2b-06dbe13acb21@oss.qualcomm.com> Date: Mon, 2 Mar 2026 14:37:02 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC 11/18] accel/qda: Add GEM_CREATE and GEM_MMAP_OFFSET IOCTLs To: Dmitry Baryshkov Cc: Oded Gabbay , Jonathan Corbet , Shuah Khan , Joerg Roedel , Will Deacon , Robin Murphy , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Sumit Semwal , =?UTF-8?Q?Christian_K=C3=B6nig?= , dri-devel@lists.freedesktop.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, iommu@lists.linux.dev, linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org, Srinivas Kandagatla , Bharath Kumar , Chenna Kesava Raju References: <20260224-qda-firstpost-v1-0-fe46a9c1a046@oss.qualcomm.com> <20260224-qda-firstpost-v1-11-fe46a9c1a046@oss.qualcomm.com> Content-Language: en-US From: Ekansh Gupta In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzAyMDA3OCBTYWx0ZWRfX92U5ph+1ELql l/9pQ6Kjpr0g0hmsb4IN6jMLmOuDXSeT+ErcCtseWdfg8W8M8xVaT9uJc1yCPehCPyZz7v7DWzR rDR5zGP3COwbjHcAHP3pX06NT+mH6S33ggEGR1dHABWus9gS+3I3Y59GgBkETVtddO1Ip/zwv4J iMD8sZlOmi8XlMmIV/BpUf0a57db5FkYGre8JVf+Blmfk8hJ0xud/8/mWu7n1/gF8rS7stPbbsI Ru80c6UQtpRMuwRFmKurlXpWj0JjjnCyFlUbkSUIgfULoM2Geox8JB3DloINzc2hl0TUVckstrI wH9qMqVZp/+KhZxRbGWS3fE00yo5cvnefi0UY5CCHqLtVk9kogPDGsXNHJJw/mhhbdeKxNMttpm QTyTGf227dzczFfKVWquhFoYM+vZJv38C+NzHcQ1SF2bvLX/be4HC1LasxNsk/U170KydaJtKm2 vWrwyjGyOe9XgKw4UvQ== X-Proofpoint-ORIG-GUID: JNy_j7GpG9wgp4achh36DImjfrX7mR6w X-Authority-Analysis: v=2.4 cv=EvbfbCcA c=1 sm=1 tr=0 ts=69a55340 cx=c_pps a=vVfyC5vLCtgYJKYeQD43oA==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=rJkE3RaqiGZ5pbrm-msn:22 a=EUspDBNiAAAA:8 a=AnjHHbesreVsCw1LpdIA:9 a=QEXdDO2ut3YA:10 a=rl5im9kqc5Lf4LNbBjHf:22 X-Proofpoint-GUID: JNy_j7GpG9wgp4achh36DImjfrX7mR6w X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-02_02,2026-02-27_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 bulkscore=0 spamscore=0 lowpriorityscore=0 priorityscore=1501 malwarescore=0 adultscore=0 impostorscore=0 clxscore=1015 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2603020078 On 2/24/2026 4:09 AM, Dmitry Baryshkov wrote: > On Tue, Feb 24, 2026 at 12:39:05AM +0530, Ekansh Gupta wrote: >> Add two GEM-related IOCTLs for the QDA accelerator driver and hook >> them into the DRM accel driver. DRM_IOCTL_QDA_GEM_CREATE allocates >> a DMA-backed GEM buffer object via qda_gem_create_object() and >> returns a GEM handle to userspace, while >> DRM_IOCTL_QDA_GEM_MMAP_OFFSET returns a valid mmap offset for a >> given GEM handle using drm_gem_create_mmap_offset() and the >> vma_node in the GEM object. >> >> The QDA driver is updated to advertise DRIVER_GEM in its >> driver_features, and the new IOCTLs are wired through the QDA >> GEM and memory-manager backend. These IOCTLs allow userspace to >> allocate buffers and map them into its address space as a first >> step toward full compute buffer management and integration with >> DSP workloads. >> >> Signed-off-by: Ekansh Gupta >> --- >> drivers/accel/qda/qda_drv.c | 5 ++++- >> drivers/accel/qda/qda_gem.h | 30 ++++++++++++++++++++++++++++++ >> drivers/accel/qda/qda_ioctl.c | 35 +++++++++++++++++++++++++++++++++++ >> include/uapi/drm/qda_accel.h | 36 ++++++++++++++++++++++++++++++++++++ >> 4 files changed, 105 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/accel/qda/qda_drv.c b/drivers/accel/qda/qda_drv.c >> index 19798359b14e..0dd0e2bb2c0f 100644 >> --- a/drivers/accel/qda/qda_drv.c >> +++ b/drivers/accel/qda/qda_drv.c >> @@ -12,6 +12,7 @@ >> #include >> >> #include "qda_drv.h" >> +#include "qda_gem.h" >> #include "qda_ioctl.h" >> #include "qda_rpmsg.h" >> >> @@ -154,10 +155,12 @@ DEFINE_DRM_ACCEL_FOPS(qda_accel_fops); >> >> static const struct drm_ioctl_desc qda_ioctls[] = { >> DRM_IOCTL_DEF_DRV(QDA_QUERY, qda_ioctl_query, 0), >> + DRM_IOCTL_DEF_DRV(QDA_GEM_CREATE, qda_ioctl_gem_create, 0), >> + DRM_IOCTL_DEF_DRV(QDA_GEM_MMAP_OFFSET, qda_ioctl_gem_mmap_offset, 0), >> }; >> >> static struct drm_driver qda_drm_driver = { >> - .driver_features = DRIVER_COMPUTE_ACCEL, >> + .driver_features = DRIVER_GEM | DRIVER_COMPUTE_ACCEL, >> .fops = &qda_accel_fops, >> .open = qda_open, >> .postclose = qda_postclose, >> diff --git a/drivers/accel/qda/qda_gem.h b/drivers/accel/qda/qda_gem.h >> index caae9cda5363..cbd5d0a58fa4 100644 >> --- a/drivers/accel/qda/qda_gem.h >> +++ b/drivers/accel/qda/qda_gem.h >> @@ -47,6 +47,36 @@ struct drm_gem_object *qda_gem_create_object(struct drm_device *drm_dev, >> void qda_gem_free_object(struct drm_gem_object *gem_obj); >> int qda_gem_mmap_obj(struct drm_gem_object *gem_obj, struct vm_area_struct *vma); >> >> +/* >> + * GEM IOCTL handlers >> + */ >> + >> +/** >> + * qda_ioctl_gem_create - Create a GEM buffer object >> + * @dev: DRM device structure >> + * @data: User-space data containing buffer creation parameters >> + * @file_priv: DRM file private data >> + * >> + * This IOCTL handler creates a new GEM buffer object with the specified >> + * size and returns a handle to the created buffer. >> + * >> + * Return: 0 on success, negative error code on failure >> + */ >> +int qda_ioctl_gem_create(struct drm_device *dev, void *data, struct drm_file *file_priv); >> + >> +/** >> + * qda_ioctl_gem_mmap_offset - Get mmap offset for a GEM buffer object >> + * @dev: DRM device structure >> + * @data: User-space data containing buffer handle and offset result >> + * @file_priv: DRM file private data >> + * >> + * This IOCTL handler retrieves the mmap offset for a GEM buffer object, >> + * which can be used to map the buffer into user-space memory. >> + * >> + * Return: 0 on success, negative error code on failure >> + */ >> +int qda_ioctl_gem_mmap_offset(struct drm_device *dev, void *data, struct drm_file *file_priv); >> + >> /* >> * Helper functions for GEM object allocation and cleanup >> * These are used internally and by the PRIME import code >> diff --git a/drivers/accel/qda/qda_ioctl.c b/drivers/accel/qda/qda_ioctl.c >> index 9fa73ec2dfce..ef3c9c691cb7 100644 >> --- a/drivers/accel/qda/qda_ioctl.c >> +++ b/drivers/accel/qda/qda_ioctl.c >> @@ -43,3 +43,38 @@ int qda_ioctl_query(struct drm_device *dev, void *data, struct drm_file *file_pr >> >> return 0; >> } >> + >> +int qda_ioctl_gem_create(struct drm_device *dev, void *data, struct drm_file *file_priv) >> +{ >> + struct drm_qda_gem_create *args = data; >> + struct drm_gem_object *gem_obj; >> + struct qda_drm_priv *drm_priv; >> + >> + drm_priv = get_drm_priv_from_device(dev); >> + if (!drm_priv || !drm_priv->iommu_mgr) >> + return -EINVAL; >> + >> + gem_obj = qda_gem_create_object(dev, drm_priv->iommu_mgr, args->size, file_priv); >> + if (IS_ERR(gem_obj)) >> + return PTR_ERR(gem_obj); >> + >> + return qda_gem_create_handle(file_priv, gem_obj, &args->handle); >> +} >> + >> +int qda_ioctl_gem_mmap_offset(struct drm_device *dev, void *data, struct drm_file *file_priv) >> +{ >> + struct drm_qda_gem_mmap_offset *args = data; >> + struct drm_gem_object *gem_obj; >> + int ret; >> + >> + gem_obj = qda_gem_lookup_object(file_priv, args->handle); >> + if (IS_ERR(gem_obj)) >> + return PTR_ERR(gem_obj); >> + >> + ret = drm_gem_create_mmap_offset(gem_obj); >> + if (ret == 0) >> + args->offset = drm_vma_node_offset_addr(&gem_obj->vma_node); >> + >> + drm_gem_object_put(gem_obj); >> + return ret; >> +} >> diff --git a/include/uapi/drm/qda_accel.h b/include/uapi/drm/qda_accel.h >> index 0aad791c4832..ed24a7f5637e 100644 >> --- a/include/uapi/drm/qda_accel.h >> +++ b/include/uapi/drm/qda_accel.h >> @@ -19,6 +19,8 @@ extern "C" { >> * They are used with DRM_COMMAND_BASE to create the full IOCTL numbers. >> */ >> #define DRM_QDA_QUERY 0x00 >> +#define DRM_QDA_GEM_CREATE 0x01 >> +#define DRM_QDA_GEM_MMAP_OFFSET 0x02 >> /* >> * QDA IOCTL definitions >> * >> @@ -27,6 +29,10 @@ extern "C" { >> * data structure and direction (read/write) for each IOCTL. >> */ >> #define DRM_IOCTL_QDA_QUERY DRM_IOR(DRM_COMMAND_BASE + DRM_QDA_QUERY, struct drm_qda_query) >> +#define DRM_IOCTL_QDA_GEM_CREATE DRM_IOWR(DRM_COMMAND_BASE + DRM_QDA_GEM_CREATE, \ >> + struct drm_qda_gem_create) >> +#define DRM_IOCTL_QDA_GEM_MMAP_OFFSET DRM_IOWR(DRM_COMMAND_BASE + DRM_QDA_GEM_MMAP_OFFSET, \ >> + struct drm_qda_gem_mmap_offset) >> >> /** >> * struct drm_qda_query - Device information query structure >> @@ -40,6 +46,36 @@ struct drm_qda_query { >> __u8 dsp_name[16]; >> }; >> >> +/** >> + * struct drm_qda_gem_create - GEM buffer object creation parameters >> + * @size: Size of the GEM object to create in bytes (input) >> + * @handle: Allocated GEM handle (output) >> + * >> + * This structure is used with DRM_IOCTL_QDA_GEM_CREATE to allocate >> + * a new GEM buffer object. >> + */ >> +struct drm_qda_gem_create { >> + __u32 handle; >> + __u32 pad; >> + __u64 size; > If you put size before handle, you would not need padding. ack > >> +}; >> + >> +/** >> + * struct drm_qda_gem_mmap_offset - GEM object mmap offset query >> + * @handle: GEM handle (input) >> + * @pad: Padding for 64-bit alignment >> + * @offset: mmap offset for the GEM object (output) >> + * >> + * This structure is used with DRM_IOCTL_QDA_GEM_MMAP_OFFSET to retrieve >> + * the mmap offset that can be used with mmap() to map the GEM object into >> + * user space. >> + */ >> +struct drm_qda_gem_mmap_offset { >> + __u32 handle; >> + __u32 pad; >> + __u64 offset; > I'm really not a fan of the pad field in the middle of the structure. ack > >> +}; >> + >> #if defined(__cplusplus) >> } >> #endif >> >> -- >> 2.34.1 >>