open-gpu-kernel-modules/kernel-open/nvidia-uvm/uvm_push.h

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/*******************************************************************************
Copyright (c) 2015-2021 NVIDIA Corporation
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to
deal in the Software without restriction, including without limitation the
rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
sell copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*******************************************************************************/
#ifndef __UVM_PUSH_H__
#define __UVM_PUSH_H__
#include "uvm_forward_decl.h"
#include "uvm_hal_types.h"
#include "uvm_channel.h"
#include "uvm_push_macros.h"
#include "uvm_tracker.h"
#include "nvtypes.h"
// Space (in bytes) used by uvm_push_end() on a CE channel.
// This is the storage required by a semaphore release.
#define UVM_PUSH_CE_END_SIZE 24
// The max amount of inline push data is limited by how much space can be jumped
// over with a single NOOP method.
#define UVM_PUSH_INLINE_DATA_MAX_SIZE (UVM_METHOD_COUNT_MAX * UVM_METHOD_SIZE)
typedef enum
{
// By default all CE transfers are not pipelined.
// This flag indicates that next CE transfer should be pipelined.
UVM_PUSH_FLAG_CE_NEXT_PIPELINED,
// By default all operations include a membar sys after any transfer and
// before a semaphore operation.
// This flag indicates that next operation should use no membar at all.
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//
// For end of push semaphore release, this flag indicates that the push
// itself does not need a membar to be used (membar sys is the default). A
// membar may still be used, if needed to order the semaphore release
// write. See comments in uvm_channel_end_push().
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UVM_PUSH_FLAG_NEXT_MEMBAR_NONE,
// By default all operations include a membar sys after any transfer and
// before a semaphore operation.
// This flag indicates that next operation should use a membar gpu instead.
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//
// For end of push semaphore release, this flag indicates that the push
// itself only needs a membar gpu (the default is membar sys). A membar sys
// may still be used, if needed to order the semaphore release write. See
// comments in uvm_channel_end_push().
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UVM_PUSH_FLAG_NEXT_MEMBAR_GPU,
UVM_PUSH_FLAG_COUNT,
} uvm_push_flag_t;
struct uvm_push_struct
{
// Location of the first method of the push
NvU32 *begin;
// Location of the next method to be written
NvU32 *next;
// The GPU the push is being done on
uvm_gpu_t *gpu;
// The channel the push is being done on or has been finished on
uvm_channel_t *channel;
// The tracking value when the push completes on the GPU on the channel
// above. It will be 0 for an on-going push.
NvU64 channel_tracking_value;
// Index for the push info stored within the channel.
// Only valid for an on-going push (after uvm_push_begin*(), but before
// uvm_push_end()).
NvU32 push_info_index;
// A bitmap of flags from uvm_push_flag_t
DECLARE_BITMAP(flags, UVM_PUSH_FLAG_COUNT);
};
#define UVM_PUSH_ACQUIRE_INFO_MAX_ENTRIES 16
// Use a custom type to keep track of acquired values, instead of
// using uvm_tracker_entry_t, to avoid having to clear the entries on GPU
// removal
struct uvm_push_acquire_info_struct
{
struct
{
NvU64 value;
uvm_gpu_id_t gpu_id;
bool is_proxy;
// Runlist and channel ID not exposed by proxy channels, so those are
// identified by their pool index
union
{
// UVM internal channels
struct
{
NvU32 runlist_id;
NvU32 channel_id;
};
// Proxy channels (SR-IOV heavy only)
struct
{
NvU32 pool_index;
} proxy;
};
} values[UVM_PUSH_ACQUIRE_INFO_MAX_ENTRIES];
NvU32 num_values;
};
struct uvm_push_info_struct
{
// List node used to track available push info entries
struct list_head available_list_node;
// Filename where the push was started
const char *filename;
// Line number where the push was started
int line;
// Function where the push was started
const char *function;
// Description of the push created from the uvm_push_begin*() format and
// arguments.
char description[128];
// Procedure to be called when the corresponding push is complete.
// This procedure is called with the UVM_LOCK_ORDER_CHANNEL spin lock held.
void (*on_complete)(void *);
void *on_complete_data;
};
typedef struct
{
// The push the inline data is part of
uvm_push_t *push;
// Location of the next data to be written
char *next_data;
} uvm_push_inline_data_t;
// Set the push description after the push already begun. This is useful if
// the description includes data generated after the push started.
void uvm_push_set_description(uvm_push_t *push, const char *format, ...);
// Is tracking push descriptions enabled?
bool uvm_push_info_is_tracking_descriptions(void);
// Is tracking of values acquired by the push enabled?
bool uvm_push_info_is_tracking_acquires(void);
// Internal helper for the uvm_push_begin* family of macros
__attribute__ ((format(printf, 9, 10)))
NV_STATUS __uvm_push_begin_acquire_with_info(uvm_channel_manager_t *manager,
uvm_channel_type_t type,
uvm_gpu_t *dst_gpu,
uvm_tracker_t *tracker,
uvm_push_t *push,
const char *filename,
const char *function,
int line,
const char *format, ...);
// Internal helper for uvm_push_begin_on_channel and
// uvm_push_begin_acquire_on_channel
__attribute__ ((format(printf, 7, 8)))
NV_STATUS __uvm_push_begin_acquire_on_channel_with_info(uvm_channel_t *channel,
uvm_tracker_t *tracker,
uvm_push_t *push,
const char *filename,
const char *function,
int line,
const char *format, ...);
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// Internal helper for uvm_push_begin_on_reserved channel
__attribute__ ((format(printf, 7, 8)))
NV_STATUS __uvm_push_begin_acquire_on_reserved_channel_with_info(uvm_channel_t *channel,
uvm_tracker_t *tracker,
uvm_push_t *push,
const char *filename,
const char *function,
int line,
const char *format, ...);
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// Begin a push on a channel of channel_type type
// Picks the first available channel. If all channels of the given type are
// busy, spin waits for one to become available.
//
// Notably requires a description of the push to be provided. This is currently
// unused, but will be in the future for tracking push history.
//
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// Locking: on success acquires the concurrent push semaphore until
// uvm_push_end()
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#define uvm_push_begin(manager, type, push, format, ...) \
__uvm_push_begin_acquire_with_info((manager), (type), NULL, NULL, (push), \
__FILE__, __FUNCTION__, __LINE__, (format), ##__VA_ARGS__)
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// Begin a push on a channel of channel_type type with dependencies in the
// tracker. This is equivalent to starting a push and acquiring the tracker, but
// in the future it will have the ability to pick the channel to do a push on in
// a smarter way based on its dependencies.
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//
// Same as for uvm_push_acquire_tracker(), the tracker can be NULL. In this case
// this will be equivalent to just uvm_push_begin().
//
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// Locking: on success acquires the concurrent push semaphore until
// uvm_push_end()
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#define uvm_push_begin_acquire(manager, type, tracker, push, format, ...) \
__uvm_push_begin_acquire_with_info((manager), (type), NULL, (tracker), (push), \
__FILE__, __FUNCTION__, __LINE__, (format), ##__VA_ARGS__)
// Specialization of uvm_push_begin that is optimized for pushes that
// transfer data from manager->gpu to dst_gpu.
// dst_gpu must be NULL or a GPU other than manager->gpu
#define uvm_push_begin_gpu_to_gpu(manager, dst_gpu, push, format, ...) \
__uvm_push_begin_acquire_with_info((manager), UVM_CHANNEL_TYPE_GPU_TO_GPU, (dst_gpu), NULL, (push), \
__FILE__, __FUNCTION__, __LINE__, (format), ##__VA_ARGS__)
// Same as uvm_push_begin_gpu_to_gpu except it also acquires the input tracker
// for the caller
#define uvm_push_begin_acquire_gpu_to_gpu(manager, dst_gpu, tracker, push, format, ...) \
__uvm_push_begin_acquire_with_info((manager), UVM_CHANNEL_TYPE_GPU_TO_GPU, (dst_gpu), (tracker), (push), \
__FILE__, __FUNCTION__, __LINE__, (format), ##__VA_ARGS__)
// Begin a push on a specific channel
// If the channel is busy, spin wait for it to become available.
//
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// Locking: on success acquires the concurrent push semaphore until
// uvm_push_end()
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#define uvm_push_begin_on_channel(channel, push, format, ...) \
__uvm_push_begin_acquire_on_channel_with_info((channel), NULL, (push), \
__FILE__, __FUNCTION__, __LINE__, (format), ##__VA_ARGS__)
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// Begin a push on a specific pre-reserved channel
//
// Locking: on success acquires the concurrent push semaphore until
// uvm_push_end()
#define uvm_push_begin_on_reserved_channel(channel, push, format, ...) \
__uvm_push_begin_acquire_on_reserved_channel_with_info((channel), NULL, (push), \
__FILE__, __FUNCTION__, __LINE__, (format), ##__VA_ARGS__)
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// Same as uvm_push_begin_on_channel except it also acquires the input tracker
// for the caller
#define uvm_push_begin_acquire_on_channel(channel, tracker, push, format, ...) \
__uvm_push_begin_acquire_on_channel_with_info((channel), (tracker), (push), \
__FILE__, __FUNCTION__, __LINE__, (format), ##__VA_ARGS__)
// End a push
// Finishes the push and submits the methods to the GPU.
//
// This will always release the channel tracking semaphore with CE and that
// release can be affected by setting the push flags (commonly
// UVM_PUSH_FLAGS_CE_NEXT_FLUSH) prior to calling uvm_push_end().
//
// Notably doesn't wait for the push to complete on the GPU and is also
// guaranteed not to block waiting on any other GPU work to complete. The only
// contention that can happen is with other CPU threads updating channel and/or
// pushbuffer state, but all of these updates are expected to be fast.
//
// Completion of the push on the GPU can be tracked with a tracker by using
// uvm_tracker_add_push() or can be waited on directly with uvm_push_wait().
// Also see uvm_push_end_and_wait() that combines ending and waiting for a push.
//
// Locking: releases the concurrent push semaphore acquired in uvm_push_begin*()
void uvm_push_end(uvm_push_t *push);
// Wait for a push to complete its execution on the GPU.
//
// The push has to be finished prior to calling this function.
// Notably currently this will only check for errors on the channel the push has
// been made on while waiting for it to complete.
NV_STATUS uvm_push_wait(uvm_push_t *push);
// End a push and wait for it to complete execution on the GPU
// Shortcut for uvm_push_end() and uvm_push_wait().
NV_STATUS uvm_push_end_and_wait(uvm_push_t *push);
// Get the tracker entry tracking the push
// The push has to be finished before calling this function.
static void uvm_push_get_tracker_entry(uvm_push_t *push, uvm_tracker_entry_t *entry)
{
UVM_ASSERT(push->channel_tracking_value != 0);
UVM_ASSERT(push->channel != NULL);
entry->channel = push->channel;
entry->value = push->channel_tracking_value;
}
// Acquire all the entries in the tracker.
// Subsequently pushed GPU work will not start before all the work tracked by
// tracker is complete.
// Notably a NULL tracker is handled the same way as an empty tracker.
void uvm_push_acquire_tracker(uvm_push_t *push, uvm_tracker_t *tracker);
// Set a push flag
static void uvm_push_set_flag(uvm_push_t *push, uvm_push_flag_t flag)
{
UVM_ASSERT_MSG(flag < UVM_PUSH_FLAG_COUNT, "flag %u\n", (unsigned)flag);
__set_bit(flag, push->flags);
}
// Get and reset (if set) a push flag
static bool uvm_push_get_and_reset_flag(uvm_push_t *push, uvm_push_flag_t flag)
{
UVM_ASSERT_MSG(flag < UVM_PUSH_FLAG_COUNT, "flag %u\n", (unsigned)flag);
return __test_and_clear_bit(flag, push->flags);
}
// Get and reset (if set) a membar push flag
static uvm_membar_t uvm_push_get_and_reset_membar_flag(uvm_push_t *push)
{
if (uvm_push_get_and_reset_flag(push, UVM_PUSH_FLAG_NEXT_MEMBAR_NONE))
return UVM_MEMBAR_NONE;
if (uvm_push_get_and_reset_flag(push, UVM_PUSH_FLAG_NEXT_MEMBAR_GPU))
return UVM_MEMBAR_GPU;
return UVM_MEMBAR_SYS;
}
// Get the size of the push so far
static NvU32 uvm_push_get_size(uvm_push_t *push)
{
return (push->next - push->begin) * sizeof(*push->next);
}
// Check whether the push still has free_space bytes available to be pushed
static bool uvm_push_has_space(uvm_push_t *push, NvU32 free_space)
{
return (UVM_MAX_PUSH_SIZE - uvm_push_get_size(push)) >= free_space;
}
// Fake push begin and end
//
// These do just enough for inline push data and uvm_push_get_gpu() to work.
// Used by tests that run on fake GPUs without a channel manager (see
// uvm_page_tree_test.c for an example).
NV_STATUS uvm_push_begin_fake(uvm_gpu_t *gpu, uvm_push_t *push);
void uvm_push_end_fake(uvm_push_t *push);
// Begin an inline data fragment in the push
//
// The inline data will be ignored by the GPU, but can be referenced from
// subsequent commands via its GPU virtual address that's returned by
// uvm_push_inline_data_end().
// Up to UVM_PUSH_INLINE_DATA_MAX_SIZE bytes can be added inline in the push
// with various helpers below. The start of the data is guaranteed to be
// initially aligned to UVM_METHOD_SIZE (4).
// While an inline data fragment is on-going (after inline_data_begin() but
// before inline_data_end()) no other commands should be issued in the push.
//
// Also see uvm_push_get_single_inline_buffer() for a simple way of adding a
// specified amount of data in one step.
static void uvm_push_inline_data_begin(uvm_push_t *push, uvm_push_inline_data_t *data)
{
data->push = push;
// +1 for the NOOP method inserted at inline_data_end()
data->next_data = (char*)(push->next + 1);
}
// End an line data fragment in the push
//
// Returns back the GPU address of the beginning of the inline data fragment.
uvm_gpu_address_t uvm_push_inline_data_end(uvm_push_inline_data_t *data);
// Get the current size of the on-going inline data fragment.
//
// Can only be used while an inline data fragment is on-going.
static size_t uvm_push_inline_data_size(uvm_push_inline_data_t *data)
{
return data->next_data - (char*)(data->push->next + 1);
}
// Get a buffer of size bytes of inline data in the push
//
// Returns the CPU pointer to the beginning of the new size bytes of data that
// the caller is supposed to write. The buffer can be accessed as long as the
// push is on-going.
void *uvm_push_inline_data_get(uvm_push_inline_data_t *data, size_t size);
// Same as uvm_push_inline_data_get() but provides the specified alignment.
void *uvm_push_inline_data_get_aligned(uvm_push_inline_data_t *data, size_t size, size_t alignment);
// Get a single buffer of size bytes of inline data in the push
//
// Returns the CPU pointer to the beginning of the buffer. The buffer can be
// accessed as long as the push is on-going. Also returns the GPU address of the
// buffer that can be accessed by commands in the same push.
//
// This is a wrapper around uvm_push_inline_data_begin() and
// uvm_push_inline_data_end() so see their comments for more details.
void *uvm_push_get_single_inline_buffer(uvm_push_t *push, size_t size, uvm_gpu_address_t *gpu_address);
// Helper that copies size bytes of data from src into the inline data fragment
static void uvm_push_inline_data_add(uvm_push_inline_data_t *data, const void *src, size_t size)
{
memcpy(uvm_push_inline_data_get(data, size), src, size);
}
// Push an operation releasing a timestamp into the pushbuffer.
//
// Returns the CPU pointer into the pushbuffer where the timestamp is going to
// be written. The timestamp can be accessed from the on_complete callback of
// the push.
NvU64 *uvm_push_timestamp(uvm_push_t *push);
static uvm_gpu_t *uvm_push_get_gpu(uvm_push_t *push)
{
UVM_ASSERT(push->gpu);
return push->gpu;
}
// Validate that the given method can be pushed to the underlying channel. The
// method contents can be used to further validate individual fields.
bool uvm_push_method_validate(uvm_push_t *push, NvU8 subch, NvU32 method_address, NvU32 method_data);
// Retrieve the push info object for a push that has already started
static uvm_push_info_t *uvm_push_info_from_push(uvm_push_t *push)
{
uvm_channel_t *channel = push->channel;
UVM_ASSERT(channel != NULL);
UVM_ASSERT(push->channel_tracking_value == 0);
UVM_ASSERT_MSG(push->push_info_index < channel->num_gpfifo_entries, "index %u\n", push->push_info_index);
return &channel->push_infos[push->push_info_index];
}
#endif // __UVM_PUSH_H__