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a=ed25519-sha256; t=1771873753; l=6299; i=ekansh.gupta@oss.qualcomm.com; s=20260223; h=from:subject:message-id; bh=6EHrB7O8xO1KO3JeXaSJmhEvz4UF48aY+wHefteIn5o=; b=PQoJ0WQ74WdOsWKY6SUsnfL5qbidltdPL4pFBld3IPPhdFunIRAZUD0aVWSiqeKX4Q+C1O8us HJ7xauW+RB+CD3tKcCU67VQ4JDbx2VlgLnYZovthqbqOs1Z9EiYO/B8 X-Developer-Key: i=ekansh.gupta@oss.qualcomm.com; a=ed25519; pk=n0SepARizye+pYjhjg1RA5J+Nq4+IJbyRcBybU+/ERQ= X-Authority-Analysis: v=2.4 cv=O6A0fR9W c=1 sm=1 tr=0 ts=699ca61e cx=c_pps a=MTSHoo12Qbhz2p7MsH1ifg==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17 a=IkcTkHD0fZMA:10 a=HzLeVaNsDn8A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=Um2Pa8k9VHT-vaBCBUpS:22 a=EUspDBNiAAAA:8 a=eDbiE4MX-y_Gg5q49BQA:9 a=QEXdDO2ut3YA:10 a=GvdueXVYPmCkWapjIL-Q:22 X-Proofpoint-ORIG-GUID: Xy3aFk8dV89HvPghR-njTtiCKWewvT2q X-Proofpoint-GUID: Xy3aFk8dV89HvPghR-njTtiCKWewvT2q X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjIzMDE2NiBTYWx0ZWRfX0eY0N+1u6cVF L3whmAyxfKek4LsOVDOAwiAZZPv1/HD0kapBoV3JXDCwfv+D1cVTOg7zkrI87yTlsjF+IeG/ybf W00fXRo+IZ9sOKdbF7NSJvrhl9WFgIqzm4X9dS9CThroDOcrToiEcfvCXZx17F5nsdvskhxD4bo yB9JCHqZCOa50DxeOZEhKPASNbXPDbJKLWY7IjCdjWB8fPUgs4yz+fsBeF0Z+It+orW8kcRhmLr P5JW9Bi6fivJcl160NH/CL05a9PUhXkqOlEQTuP0D1u/iajRw0ONMD8WjT5YEYuJYeVYlzavMXa 2x8DzSKP2IaQu6UIox8UaMO7mH9Bue4vPD20WzgaPV5oRoZg+GtfaPWgLrOu5M5uA5M1hnGT2h9 efrcLkX7U6PUJewRTAVPwMUVaC7C8EJ+fLCSqIHEvgrcLX5fpqIyZ75JPYZuXD2KcP/LnhYTxjU sOcmeSPDEHRBItFyW3A== 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=2026-02-23_04,2026-02-23_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 clxscore=1015 lowpriorityscore=0 adultscore=0 priorityscore=1501 impostorscore=0 phishscore=0 malwarescore=0 bulkscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2602230166 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Introduce per-file and per-user context for the QDA DRM accelerator driver. A new qda_file_priv structure is stored in file->driver_priv for each open file descriptor, and a qda_user object is allocated per client with a unique client_id generated from an atomic counter in qda_dev. The DRM driver now provides qda_open() and qda_postclose() callbacks. qda_open() resolves the qda_dev from the drm_device, allocates the qda_file_priv and qda_user structures, and attaches them to the DRM file. qda_postclose() tears down the per-file context and frees the qda_user object when the file is closed. This prepares the QDA driver to track per-process state for future features such as per-client memory mappings, job submission contexts, and access control over DSP compute resources. Signed-off-by: Ekansh Gupta --- drivers/accel/qda/qda_drv.c | 117 ++++++++++++++++++++++++++++++++++++++++++++ drivers/accel/qda/qda_drv.h | 30 ++++++++++++ 2 files changed, 147 insertions(+) diff --git a/drivers/accel/qda/qda_drv.c b/drivers/accel/qda/qda_drv.c index a9113ec78fa2..bf95fc782cf8 100644 --- a/drivers/accel/qda/qda_drv.c +++ b/drivers/accel/qda/qda_drv.c @@ -12,11 +12,127 @@ #include "qda_drv.h" #include "qda_rpmsg.h" +static struct qda_drm_priv *get_drm_priv_from_device(struct drm_device *dev) +{ + if (!dev) + return NULL; + + return (struct qda_drm_priv *)dev->dev_private; +} + +static struct qda_dev *get_qdev_from_drm_device(struct drm_device *dev) +{ + struct qda_drm_priv *drm_priv; + + if (!dev) { + qda_dbg(NULL, "Invalid drm_device\n"); + return NULL; + } + + drm_priv = get_drm_priv_from_device(dev); + if (!drm_priv) { + qda_dbg(NULL, "No drm_priv in dev_private\n"); + return NULL; + } + + return drm_priv->qdev; +} + +static struct qda_user *alloc_qda_user(struct qda_dev *qdev) +{ + struct qda_user *qda_user; + + qda_user = kzalloc_obj(*qda_user, GFP_KERNEL); + if (!qda_user) + return NULL; + + qda_user->client_id = atomic_inc_return(&qdev->client_id_counter); + qda_user->qda_dev = qdev; + + qda_dbg(qdev, "Allocated qda_user with client_id=%u\n", qda_user->client_id); + return qda_user; +} + +static void free_qda_user(struct qda_user *qda_user) +{ + if (!qda_user) + return; + + qda_dbg(qda_user->qda_dev, "Freeing qda_user client_id=%u\n", qda_user->client_id); + + kfree(qda_user); +} + +static int qda_open(struct drm_device *dev, struct drm_file *file) +{ + struct qda_user *qda_user; + struct qda_file_priv *qda_file_priv; + struct qda_dev *qdev; + + if (!file) { + qda_dbg(NULL, "Invalid file pointer\n"); + return -EINVAL; + } + + qdev = get_qdev_from_drm_device(dev); + if (!qdev) { + qda_dbg(NULL, "Failed to get qdev from drm_device\n"); + return -EINVAL; + } + + qda_file_priv = kzalloc(sizeof(*qda_file_priv), GFP_KERNEL); + if (!qda_file_priv) + return -ENOMEM; + + qda_file_priv->pid = current->pid; + + qda_user = alloc_qda_user(qdev); + if (!qda_user) { + qda_dbg(qdev, "Failed to allocate qda_user\n"); + kfree(qda_file_priv); + return -ENOMEM; + } + + file->driver_priv = qda_file_priv; + qda_file_priv->qda_user = qda_user; + + qda_dbg(qdev, "Device opened successfully for PID %d\n", current->pid); + + return 0; +} + +static void qda_postclose(struct drm_device *dev, struct drm_file *file) +{ + struct qda_dev *qdev; + struct qda_file_priv *qda_file_priv; + struct qda_user *qda_user; + + qdev = get_qdev_from_drm_device(dev); + if (!qdev || atomic_read(&qdev->removing)) { + qda_dbg(NULL, "Device unavailable or removing\n"); + return; + } + + qda_file_priv = (struct qda_file_priv *)file->driver_priv; + if (qda_file_priv) { + qda_user = qda_file_priv->qda_user; + if (qda_user) + free_qda_user(qda_user); + + kfree(qda_file_priv); + file->driver_priv = NULL; + } + + qda_dbg(qdev, "Device closed for PID %d\n", current->pid); +} + DEFINE_DRM_ACCEL_FOPS(qda_accel_fops); static struct drm_driver qda_drm_driver = { .driver_features = DRIVER_COMPUTE_ACCEL, .fops = &qda_accel_fops, + .open = qda_open, + .postclose = qda_postclose, .name = DRIVER_NAME, .desc = "Qualcomm DSP Accelerator Driver", }; @@ -58,6 +174,7 @@ static void init_device_resources(struct qda_dev *qdev) mutex_init(&qdev->lock); atomic_set(&qdev->removing, 0); + atomic_set(&qdev->client_id_counter, 0); } static int init_memory_manager(struct qda_dev *qdev) diff --git a/drivers/accel/qda/qda_drv.h b/drivers/accel/qda/qda_drv.h index 2b80401a3741..e0ba37702a86 100644 --- a/drivers/accel/qda/qda_drv.h +++ b/drivers/accel/qda/qda_drv.h @@ -10,6 +10,7 @@ #include #include #include +#include #include #include #include @@ -20,6 +21,33 @@ /* Driver identification */ #define DRIVER_NAME "qda" +/** + * struct qda_file_priv - Per-process private data for DRM file + * + * This structure tracks per-process state for each open file descriptor. + * It maintains the IOMMU device assignment and links to the legacy qda_user + * structure for compatibility with existing code. + */ +struct qda_file_priv { + /* Process ID for tracking */ + pid_t pid; + /* Pointer to qda_user structure for backward compatibility */ + struct qda_user *qda_user; +}; + +/** + * struct qda_user - Per-user context for remote processor interaction + * + * This structure maintains per-user state for interactions with the + * remote processor, including memory mappings and pending operations. + */ +struct qda_user { + /* Unique client identifier */ + u32 client_id; + /* Back-pointer to device structure */ + struct qda_dev *qda_dev; +}; + /** * struct qda_drm_priv - DRM device private data for QDA device * @@ -52,6 +80,8 @@ struct qda_dev { struct qda_drm_priv *drm_priv; /* Flag indicating device removal in progress */ atomic_t removing; + /* Atomic counter for generating unique client IDs */ + atomic_t client_id_counter; /* Name of the DSP (e.g., "cdsp", "adsp") */ char dsp_name[16]; /* Compute context-bank (CB) child devices */ -- 2.34.1