blob: 6fe86f6dfe422976bfa49d7f2bb763e0bee604c6 [file] [log] [blame]
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
* (C) COPYRIGHT 2014-2022 ARM Limited. All rights reserved.
* This program is free software and is provided to you under the terms of the
* GNU General Public License version 2 as published by the Free Software
* Foundation, and any use by you of this program is subject to the terms
* of such GNU license.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, you can access it online at
* Register-based HW access backend specific definitions
/* SLOT_RB_SIZE must be < 256 */
#define SLOT_RB_SIZE 2
* struct rb_entry - Ringbuffer entry
* @katom: Atom associated with this entry
struct rb_entry {
struct kbase_jd_atom *katom;
/* SLOT_RB_TAG_PURGED assumes a value that is different from
* NULL (SLOT_RB_NULL_TAG_VAL) and will not be the result of
* any valid pointer via macro translation: SLOT_RB_TAG_KCTX(x).
#define SLOT_RB_TAG_PURGED ((u64)(1 << 1))
#define SLOT_RB_NULL_TAG_VAL ((u64)0)
* SLOT_RB_TAG_KCTX() - a function-like macro for converting a pointer to a
* u64 for serving as tagged value.
* @kctx: Pointer to kbase context.
#define SLOT_RB_TAG_KCTX(kctx) (u64)((uintptr_t)(kctx))
* struct slot_rb - Slot ringbuffer
* @entries: Ringbuffer entries
* @last_kctx_tagged: The last context that submitted a job to the slot's
* HEAD_NEXT register. The value is a tagged variant so
* must not be dereferenced. It is used in operation to
* track when shader core L1 caches might contain a
* previous context's data, and so must only be set to
* SLOT_RB_NULL_TAG_VAL after reset/powerdown of the
* cores. In slot job submission, if there is a kctx
* change, and the relevant katom is configured with
* BASE_JD_REQ_SKIP_CACHE_START, a L1 read only cache
* maintenance operation is enforced.
* @read_idx: Current read index of buffer
* @write_idx: Current write index of buffer
* @job_chain_flag: Flag used to implement jobchain disambiguation
struct slot_rb {
struct rb_entry entries[SLOT_RB_SIZE];
u64 last_kctx_tagged;
u8 read_idx;
u8 write_idx;
u8 job_chain_flag;
* struct kbase_backend_data - GPU backend specific data for HW access layer
* @slot_rb: Slot ringbuffers
* @scheduling_timer: The timer tick used for rescheduling jobs
* @timer_running: Is the timer running? The runpool_mutex must be
* held whilst modifying this.
* @suspend_timer: Is the timer suspended? Set when a suspend
* occurs and cleared on resume. The runpool_mutex
* must be held whilst modifying this.
* @reset_gpu: Set to a KBASE_RESET_xxx value (see comments)
* @reset_workq: Work queue for performing the reset
* @reset_work: Work item for performing the reset
* @reset_wait: Wait event signalled when the reset is complete
* @reset_timer: Timeout for soft-stops before the reset
* @timeouts_updated: Have timeout values just been updated?
* The hwaccess_lock (a spinlock) must be held when accessing this structure
struct kbase_backend_data {
struct slot_rb slot_rb[BASE_JM_MAX_NR_SLOTS];
struct hrtimer scheduling_timer;
bool timer_running;
bool suspend_timer;
atomic_t reset_gpu;
/* The GPU reset isn't pending */
/* kbase_prepare_to_reset_gpu has been called */
/* kbase_reset_gpu has been called - the reset will now definitely happen
* within the timeout period
/* The GPU reset process is currently occuring (timeout has expired or
* kbasep_try_reset_gpu_early was called)
/* Reset the GPU silently, used when resetting the GPU as part of normal
* behavior (e.g. when exiting protected mode).
struct workqueue_struct *reset_workq;
struct work_struct reset_work;
wait_queue_head_t reset_wait;
struct hrtimer reset_timer;
bool timeouts_updated;