1 files changed, 464 insertions, 0 deletions
diff --git a/drivers/gpu/drm/imagination/pvr_context.c b/drivers/gpu/drm/imagination/pvr_context.c
new file mode 100644
index 000000000000..eded5e955cc0
--- /dev/null
+++ b/drivers/gpu/drm/imagination/pvr_context.c
@@ -0,0 +1,464 @@
+// SPDX-License-Identifier: GPL-2.0-only OR MIT
+/* Copyright (c) 2023 Imagination Technologies Ltd. */
+
+#include "pvr_cccb.h"
+#include "pvr_context.h"
+#include "pvr_device.h"
+#include "pvr_drv.h"
+#include "pvr_gem.h"
+#include "pvr_job.h"
+#include "pvr_power.h"
+#include "pvr_rogue_fwif.h"
+#include "pvr_rogue_fwif_common.h"
+#include "pvr_rogue_fwif_resetframework.h"
+#include "pvr_stream.h"
+#include "pvr_stream_defs.h"
+#include "pvr_vm.h"
+
+#include <drm/drm_auth.h>
+#include <drm/drm_managed.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/xarray.h>
+
+static int
+remap_priority(struct pvr_file *pvr_file, s32 uapi_priority,
+	       enum pvr_context_priority *priority_out)
+{
+	switch (uapi_priority) {
+	case DRM_PVR_CTX_PRIORITY_LOW:
+		*priority_out = PVR_CTX_PRIORITY_LOW;
+		break;
+	case DRM_PVR_CTX_PRIORITY_NORMAL:
+		*priority_out = PVR_CTX_PRIORITY_MEDIUM;
+		break;
+	case DRM_PVR_CTX_PRIORITY_HIGH:
+		if (!capable(CAP_SYS_NICE) && !drm_is_current_master(from_pvr_file(pvr_file)))
+			return -EACCES;
+		*priority_out = PVR_CTX_PRIORITY_HIGH;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int get_fw_obj_size(enum drm_pvr_ctx_type type)
+{
+	switch (type) {
+	case DRM_PVR_CTX_TYPE_RENDER:
+		return sizeof(struct rogue_fwif_fwrendercontext);
+	case DRM_PVR_CTX_TYPE_COMPUTE:
+		return sizeof(struct rogue_fwif_fwcomputecontext);
+	case DRM_PVR_CTX_TYPE_TRANSFER_FRAG:
+		return sizeof(struct rogue_fwif_fwtransfercontext);
+	}
+
+	return -EINVAL;
+}
+
+static int
+process_static_context_state(struct pvr_device *pvr_dev, const struct pvr_stream_cmd_defs *cmd_defs,
+			     u64 stream_user_ptr, u32 stream_size, void *dest)
+{
+	void *stream;
+	int err;
+
+	stream = kzalloc(stream_size, GFP_KERNEL);
+	if (!stream)
+		return -ENOMEM;
+
+	if (copy_from_user(stream, u64_to_user_ptr(stream_user_ptr), stream_size)) {
+		err = -EFAULT;
+		goto err_free;
+	}
+
+	err = pvr_stream_process(pvr_dev, cmd_defs, stream, stream_size, dest);
+	if (err)
+		goto err_free;
+
+	kfree(stream);
+
+	return 0;
+
+err_free:
+	kfree(stream);
+
+	return err;
+}
+
+static int init_render_fw_objs(struct pvr_context *ctx,
+			       struct drm_pvr_ioctl_create_context_args *args,
+			       void *fw_ctx_map)
+{
+	struct rogue_fwif_static_rendercontext_state *static_rendercontext_state;
+	struct rogue_fwif_fwrendercontext *fw_render_context = fw_ctx_map;
+
+	if (!args->static_context_state_len)
+		return -EINVAL;
+
+	static_rendercontext_state = &fw_render_context->static_render_context_state;
+
+	/* Copy static render context state from userspace. */
+	return process_static_context_state(ctx->pvr_dev,
+					    &pvr_static_render_context_state_stream,
+					    args->static_context_state,
+					    args->static_context_state_len,
+					    &static_rendercontext_state->ctxswitch_regs[0]);
+}
+
+static int init_compute_fw_objs(struct pvr_context *ctx,
+				struct drm_pvr_ioctl_create_context_args *args,
+				void *fw_ctx_map)
+{
+	struct rogue_fwif_fwcomputecontext *fw_compute_context = fw_ctx_map;
+	struct rogue_fwif_cdm_registers_cswitch *ctxswitch_regs;
+
+	if (!args->static_context_state_len)
+		return -EINVAL;
+
+	ctxswitch_regs = &fw_compute_context->static_compute_context_state.ctxswitch_regs;
+
+	/* Copy static render context state from userspace. */
+	return process_static_context_state(ctx->pvr_dev,
+					    &pvr_static_compute_context_state_stream,
+					    args->static_context_state,
+					    args->static_context_state_len,
+					    ctxswitch_regs);
+}
+
+static int init_transfer_fw_objs(struct pvr_context *ctx,
+				 struct drm_pvr_ioctl_create_context_args *args,
+				 void *fw_ctx_map)
+{
+	if (args->static_context_state_len)
+		return -EINVAL;
+
+	return 0;
+}
+
+static int init_fw_objs(struct pvr_context *ctx,
+			struct drm_pvr_ioctl_create_context_args *args,
+			void *fw_ctx_map)
+{
+	switch (ctx->type) {
+	case DRM_PVR_CTX_TYPE_RENDER:
+		return init_render_fw_objs(ctx, args, fw_ctx_map);
+	case DRM_PVR_CTX_TYPE_COMPUTE:
+		return init_compute_fw_objs(ctx, args, fw_ctx_map);
+	case DRM_PVR_CTX_TYPE_TRANSFER_FRAG:
+		return init_transfer_fw_objs(ctx, args, fw_ctx_map);
+	}
+
+	return -EINVAL;
+}
+
+static void
+ctx_fw_data_init(void *cpu_ptr, void *priv)
+{
+	struct pvr_context *ctx = priv;
+
+	memcpy(cpu_ptr, ctx->data, ctx->data_size);
+}
+
+/**
+ * pvr_context_destroy_queues() - Destroy all queues attached to a context.
+ * @ctx: Context to destroy queues on.
+ *
+ * Should be called when the last reference to a context object is dropped.
+ * It releases all resources attached to the queues bound to this context.
+ */
+static void pvr_context_destroy_queues(struct pvr_context *ctx)
+{
+	switch (ctx->type) {
+	case DRM_PVR_CTX_TYPE_RENDER:
+		pvr_queue_destroy(ctx->queues.fragment);
+		pvr_queue_destroy(ctx->queues.geometry);
+		break;
+	case DRM_PVR_CTX_TYPE_COMPUTE:
+		pvr_queue_destroy(ctx->queues.compute);
+		break;
+	case DRM_PVR_CTX_TYPE_TRANSFER_FRAG:
+		pvr_queue_destroy(ctx->queues.transfer);
+		break;
+	}
+}
+
+/**
+ * pvr_context_create_queues() - Create all queues attached to a context.
+ * @ctx: Context to create queues on.
+ * @args: Context creation arguments passed by userspace.
+ * @fw_ctx_map: CPU mapping of the FW context object.
+ *
+ * Return:
+ *  * 0 on success, or
+ *  * A negative error code otherwise.
+ */
+static int pvr_context_create_queues(struct pvr_context *ctx,
+				     struct drm_pvr_ioctl_create_context_args *args,
+				     void *fw_ctx_map)
+{
+	int err;
+
+	switch (ctx->type) {
+	case DRM_PVR_CTX_TYPE_RENDER:
+		ctx->queues.geometry = pvr_queue_create(ctx, DRM_PVR_JOB_TYPE_GEOMETRY,
+							args, fw_ctx_map);
+		if (IS_ERR(ctx->queues.geometry)) {
+			err = PTR_ERR(ctx->queues.geometry);
+			ctx->queues.geometry = NULL;
+			goto err_destroy_queues;
+		}
+
+		ctx->queues.fragment = pvr_queue_create(ctx, DRM_PVR_JOB_TYPE_FRAGMENT,
+							args, fw_ctx_map);
+		if (IS_ERR(ctx->queues.fragment)) {
+			err = PTR_ERR(ctx->queues.fragment);
+			ctx->queues.fragment = NULL;
+			goto err_destroy_queues;
+		}
+		return 0;
+
+	case DRM_PVR_CTX_TYPE_COMPUTE:
+		ctx->queues.compute = pvr_queue_create(ctx, DRM_PVR_JOB_TYPE_COMPUTE,
+						       args, fw_ctx_map);
+		if (IS_ERR(ctx->queues.compute)) {
+			err = PTR_ERR(ctx->queues.compute);
+			ctx->queues.compute = NULL;
+			goto err_destroy_queues;
+		}
+		return 0;
+
+	case DRM_PVR_CTX_TYPE_TRANSFER_FRAG:
+		ctx->queues.transfer = pvr_queue_create(ctx, DRM_PVR_JOB_TYPE_TRANSFER_FRAG,
+							args, fw_ctx_map);
+		if (IS_ERR(ctx->queues.transfer)) {
+			err = PTR_ERR(ctx->queues.transfer);
+			ctx->queues.transfer = NULL;
+			goto err_destroy_queues;
+		}
+		return 0;
+	}
+
+	return -EINVAL;
+
+err_destroy_queues:
+	pvr_context_destroy_queues(ctx);
+	return err;
+}
+
+/**
+ * pvr_context_kill_queues() - Kill queues attached to context.
+ * @ctx: Context to kill queues on.
+ *
+ * Killing the queues implies making them unusable for future jobs, while still
+ * letting the currently submitted jobs a chance to finish. Queue resources will
+ * stay around until pvr_context_destroy_queues() is called.
+ */
+static void pvr_context_kill_queues(struct pvr_context *ctx)
+{
+	switch (ctx->type) {
+	case DRM_PVR_CTX_TYPE_RENDER:
+		pvr_queue_kill(ctx->queues.fragment);
+		pvr_queue_kill(ctx->queues.geometry);
+		break;
+	case DRM_PVR_CTX_TYPE_COMPUTE:
+		pvr_queue_kill(ctx->queues.compute);
+		break;
+	case DRM_PVR_CTX_TYPE_TRANSFER_FRAG:
+		pvr_queue_kill(ctx->queues.transfer);
+		break;
+	}
+}
+
+/**
+ * pvr_context_create() - Create a context.
+ * @pvr_file: File to attach the created context to.
+ * @args: Context creation arguments.
+ *
+ * Return:
+ *  * 0 on success, or
+ *  * A negative error code on failure.
+ */
+int pvr_context_create(struct pvr_file *pvr_file, struct drm_pvr_ioctl_create_context_args *args)
+{
+	struct pvr_device *pvr_dev = pvr_file->pvr_dev;
+	struct pvr_context *ctx;
+	int ctx_size;
+	int err;
+
+	/* Context creation flags are currently unused and must be zero. */
+	if (args->flags)
+		return -EINVAL;
+
+	ctx_size = get_fw_obj_size(args->type);
+	if (ctx_size < 0)
+		return ctx_size;
+
+	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	ctx->data_size = ctx_size;
+	ctx->type = args->type;
+	ctx->flags = args->flags;
+	ctx->pvr_dev = pvr_dev;
+	kref_init(&ctx->ref_count);
+
+	err = remap_priority(pvr_file, args->priority, &ctx->priority);
+	if (err)
+		goto err_free_ctx;
+
+	ctx->vm_ctx = pvr_vm_context_lookup(pvr_file, args->vm_context_handle);
+	if (IS_ERR(ctx->vm_ctx)) {
+		err = PTR_ERR(ctx->vm_ctx);
+		goto err_free_ctx;
+	}
+
+	ctx->data = kzalloc(ctx_size, GFP_KERNEL);
+	if (!ctx->data) {
+		err = -ENOMEM;
+		goto err_put_vm;
+	}
+
+	err = pvr_context_create_queues(ctx, args, ctx->data);
+	if (err)
+		goto err_free_ctx_data;
+
+	err = init_fw_objs(ctx, args, ctx->data);
+	if (err)
+		goto err_destroy_queues;
+
+	err = pvr_fw_object_create(pvr_dev, ctx_size, PVR_BO_FW_FLAGS_DEVICE_UNCACHED,
+				   ctx_fw_data_init, ctx, &ctx->fw_obj);
+	if (err)
+		goto err_free_ctx_data;
+
+	err = xa_alloc(&pvr_dev->ctx_ids, &ctx->ctx_id, ctx, xa_limit_32b, GFP_KERNEL);
+	if (err)
+		goto err_destroy_fw_obj;
+
+	err = xa_alloc(&pvr_file->ctx_handles, &args->handle, ctx, xa_limit_32b, GFP_KERNEL);
+	if (err) {
+		/*
+		 * It's possible that another thread could have taken a reference on the context at
+		 * this point as it is in the ctx_ids xarray. Therefore instead of directly
+		 * destroying the context, drop a reference instead.
+		 */
+		pvr_context_put(ctx);
+		return err;
+	}
+
+	return 0;
+
+err_destroy_fw_obj:
+	pvr_fw_object_destroy(ctx->fw_obj);
+
+err_destroy_queues:
+	pvr_context_destroy_queues(ctx);
+
+err_free_ctx_data:
+	kfree(ctx->data);
+
+err_put_vm:
+	pvr_vm_context_put(ctx->vm_ctx);
+
+err_free_ctx:
+	kfree(ctx);
+	return err;
+}
+
+static void
+pvr_context_release(struct kref *ref_count)
+{
+	struct pvr_context *ctx =
+		container_of(ref_count, struct pvr_context, ref_count);
+	struct pvr_device *pvr_dev = ctx->pvr_dev;
+
+	xa_erase(&pvr_dev->ctx_ids, ctx->ctx_id);
+	pvr_context_destroy_queues(ctx);
+	pvr_fw_object_destroy(ctx->fw_obj);
+	kfree(ctx->data);
+	pvr_vm_context_put(ctx->vm_ctx);
+	kfree(ctx);
+}
+
+/**
+ * pvr_context_put() - Release reference on context
+ * @ctx: Target context.
+ */
+void
+pvr_context_put(struct pvr_context *ctx)
+{
+	if (ctx)
+		kref_put(&ctx->ref_count, pvr_context_release);
+}
+
+/**
+ * pvr_context_destroy() - Destroy context
+ * @pvr_file: Pointer to pvr_file structure.
+ * @handle: Userspace context handle.
+ *
+ * Removes context from context list and drops initial reference. Context will
+ * then be destroyed once all outstanding references are dropped.
+ *
+ * Return:
+ *  * 0 on success, or
+ *  * -%EINVAL if context not in context list.
+ */
+int
+pvr_context_destroy(struct pvr_file *pvr_file, u32 handle)
+{
+	struct pvr_context *ctx = xa_erase(&pvr_file->ctx_handles, handle);
+
+	if (!ctx)
+		return -EINVAL;
+
+	/* Make sure nothing can be queued to the queues after that point. */
+	pvr_context_kill_queues(ctx);
+
+	/* Release the reference held by the handle set. */
+	pvr_context_put(ctx);
+
+	return 0;
+}
+
+/**
+ * pvr_destroy_contexts_for_file: Destroy any contexts associated with the given file
+ * @pvr_file: Pointer to pvr_file structure.
+ *
+ * Removes all contexts associated with @pvr_file from the device context list and drops initial
+ * references. Contexts will then be destroyed once all outstanding references are dropped.
+ */
+void pvr_destroy_contexts_for_file(struct pvr_file *pvr_file)
+{
+	struct pvr_context *ctx;
+	unsigned long handle;
+
+	xa_for_each(&pvr_file->ctx_handles, handle, ctx)
+		pvr_context_destroy(pvr_file, handle);
+}
+
+/**
+ * pvr_context_device_init() - Device level initialization for queue related resources.
+ * @pvr_dev: The device to initialize.
+ */
+void pvr_context_device_init(struct pvr_device *pvr_dev)
+{
+	xa_init_flags(&pvr_dev->ctx_ids, XA_FLAGS_ALLOC1);
+}
+
+/**
+ * pvr_context_device_fini() - Device level cleanup for queue related resources.
+ * @pvr_dev: The device to cleanup.
+ */
+void pvr_context_device_fini(struct pvr_device *pvr_dev)
+{
+	WARN_ON(!xa_empty(&pvr_dev->ctx_ids));
+	xa_destroy(&pvr_dev->ctx_ids);
+}