diff options
author | Sarah Walker <sarah.walker@imgtec.com> | 2023-11-22 19:34:37 +0300 |
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committer | Maxime Ripard <mripard@kernel.org> | 2023-11-23 11:01:46 +0300 |
commit | d2d79d29bb98a32c511f7339a8e93b47544fdeac (patch) | |
tree | e42b413c285188fd677d059e8c9f9806bc32c414 /drivers/gpu/drm/imagination/pvr_context.c | |
parent | 6eedddab733b350886571f98b810108b13bf74ae (diff) | |
download | linux-d2d79d29bb98a32c511f7339a8e93b47544fdeac.tar.xz |
drm/imagination: Implement context creation/destruction ioctls
Implement ioctls for the creation and destruction of contexts. Contexts are
used for job submission and each is associated with a particular job type.
Changes since v8:
- Fixed one error path in pvr_stream_process_1()
- Corrected license identifiers
Changes since v5:
- Fix context release in final error path in pvr_context_create()
Changes since v3:
- Use drm_dev_{enter,exit}
Co-developed-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Sarah Walker <sarah.walker@imgtec.com>
Signed-off-by: Donald Robson <donald.robson@imgtec.com>
Link: https://lore.kernel.org/r/ac474a1f7dda2582d290798e4837140a2989aa2a.1700668843.git.donald.robson@imgtec.com
Signed-off-by: Maxime Ripard <mripard@kernel.org>
Diffstat (limited to 'drivers/gpu/drm/imagination/pvr_context.c')
-rw-r--r-- | drivers/gpu/drm/imagination/pvr_context.c | 341 |
1 files changed, 341 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..6cec5aa5a759 --- /dev/null +++ b/drivers/gpu/drm/imagination/pvr_context.c @@ -0,0 +1,341 @@ +// 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_power.h" +#include "pvr_rogue_fwif.h" +#include "pvr_rogue_fwif_common.h" +#include "pvr_rogue_fwif_resetframework.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_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 = init_fw_objs(ctx, args, ctx->data); + if (err) + goto err_free_ctx_data; + + 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_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_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; + + /* 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); +} |