/* SPDX-License-Identifier: GPL-2.0-only OR MIT */
/* Copyright (c) 2023 Imagination Technologies Ltd. */
#ifndef PVR_CONTEXT_H
#define PVR_CONTEXT_H
#include <drm/gpu_scheduler.h>
#include <linux/compiler_attributes.h>
#include <linux/dma-fence.h>
#include <linux/kref.h>
#include <linux/types.h>
#include <linux/xarray.h>
#include <uapi/drm/pvr_drm.h>
#include "pvr_cccb.h"
#include "pvr_device.h"
#include "pvr_queue.h"
/* Forward declaration from pvr_gem.h. */
struct pvr_fw_object;
enum pvr_context_priority {
PVR_CTX_PRIORITY_LOW = 0,
PVR_CTX_PRIORITY_MEDIUM,
PVR_CTX_PRIORITY_HIGH,
};
/**
* struct pvr_context - Context data
*/
struct pvr_context {
/** @ref_count: Refcount for context. */
struct kref ref_count;
/** @pvr_dev: Pointer to owning device. */
struct pvr_device *pvr_dev;
/** @vm_ctx: Pointer to associated VM context. */
struct pvr_vm_context *vm_ctx;
/** @type: Type of context. */
enum drm_pvr_ctx_type type;
/** @flags: Context flags. */
u32 flags;
/** @priority: Context priority*/
enum pvr_context_priority priority;
/** @fw_obj: FW object representing FW-side context data. */
struct pvr_fw_object *fw_obj;
/** @data: Pointer to local copy of FW context data. */
void *data;
/** @data_size: Size of FW context data, in bytes. */
u32 data_size;
/** @ctx_id: FW context ID. */
u32 ctx_id;
/**
* @faulty: Set to 1 when the context queues had unfinished job when
* a GPU reset happened.
*
* In that case, the context is in an inconsistent state and can't be
* used anymore.
*/
atomic_t faulty;
/** @queues: Union containing all kind of queues. */
union {
struct {
/** @geometry: Geometry queue. */
struct pvr_queue *geometry;
/** @fragment: Fragment queue. */
struct pvr_queue *fragment;
};
/** @compute: Compute queue. */
struct pvr_queue *compute;
/** @compute: Transfer queue. */
struct pvr_queue *transfer;
} queues;
};
static __always_inline struct pvr_queue *
pvr_context_get_queue_for_job(struct pvr_context *ctx, enum drm_pvr_job_type type)
{
switch (type) {
case DRM_PVR_JOB_TYPE_GEOMETRY:
return ctx->type == DRM_PVR_CTX_TYPE_RENDER ? ctx->queues.geometry : NULL;
case DRM_PVR_JOB_TYPE_FRAGMENT:
return ctx->type == DRM_PVR_CTX_TYPE_RENDER ? ctx->queues.fragment : NULL;
case DRM_PVR_JOB_TYPE_COMPUTE:
return ctx->type == DRM_PVR_CTX_TYPE_COMPUTE ? ctx->queues.compute : NULL;
case DRM_PVR_JOB_TYPE_TRANSFER_FRAG:
return ctx->type == DRM_PVR_CTX_TYPE_TRANSFER_FRAG ? ctx->queues.transfer : NULL;
}
return NULL;
}
/**
* pvr_context_get() - Take additional reference on context.
* @ctx: Context pointer.
*
* Call pvr_context_put() to release.
*
* Returns:
* * The requested context on success, or
* * %NULL if no context pointer passed.
*/
static __always_inline struct pvr_context *
pvr_context_get(struct pvr_context *ctx)
{
if (ctx)
kref_get(&ctx->ref_count);
return ctx;
}
/**
* pvr_context_lookup() - Lookup context pointer from handle and file.
* @pvr_file: Pointer to pvr_file structure.
* @handle: Context handle.
*
* Takes reference on context. Call pvr_context_put() to release.
*
* Return:
* * The requested context on success, or
* * %NULL on failure (context does not exist, or does not belong to @pvr_file).
*/
static __always_inline struct pvr_context *
pvr_context_lookup(struct pvr_file *pvr_file, u32 handle)
{
struct pvr_context *ctx;
/* Take the array lock to protect against context removal. */
xa_lock(&pvr_file->ctx_handles);
ctx = pvr_context_get(xa_load(&pvr_file->ctx_handles, handle));
xa_unlock(&pvr_file->ctx_handles);
return ctx;
}
/**
* pvr_context_lookup_id() - Lookup context pointer from ID.
* @pvr_dev: Device pointer.
* @id: FW context ID.
*
* Takes reference on context. Call pvr_context_put() to release.
*
* Return:
* * The requested context on success, or
* * %NULL on failure (context does not exist).
*/
static __always_inline struct pvr_context *
pvr_context_lookup_id(struct pvr_device *pvr_dev, u32 id)
{
struct pvr_context *ctx;
/* Take the array lock to protect against context removal. */
xa_lock(&pvr_dev->ctx_ids);
/* Contexts are removed from the ctx_ids set in the context release path,
* meaning the ref_count reached zero before they get removed. We need
* to make sure we're not trying to acquire a context that's being
* destroyed.
*/
ctx = xa_load(&pvr_dev->ctx_ids, id);
if (!kref_get_unless_zero(&ctx->ref_count))
ctx = NULL;
xa_unlock(&pvr_dev->ctx_ids);
return ctx;
}
static __always_inline u32
pvr_context_get_fw_addr(struct pvr_context *ctx)
{
u32 ctx_fw_addr = 0;
pvr_fw_object_get_fw_addr(ctx->fw_obj, &ctx_fw_addr);
return ctx_fw_addr;
}
void pvr_context_put(struct pvr_context *ctx);
int pvr_context_create(struct pvr_file *pvr_file, struct drm_pvr_ioctl_create_context_args *args);
int pvr_context_destroy(struct pvr_file *pvr_file, u32 handle);
void pvr_destroy_contexts_for_file(struct pvr_file *pvr_file);
void pvr_context_device_init(struct pvr_device *pvr_dev);
void pvr_context_device_fini(struct pvr_device *pvr_dev);
#endif /* PVR_CONTEXT_H */
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