Re: [PATCH libdrm 3/6] amdgpu: add handle table implementation

["Zhang, Jerry (Junwei)" <Jerry.Zhang-5C7GfCeVMHo@public.gmane.org>]

On 08/02/2018 10:04 PM, Christian König wrote:
> The kernel handles are dense and the kernel always tries to use the
> lowest free id. Use this to implement a more efficient handle table
> by using a resizeable array instead of a hash.
>
> Signed-off-by: Christian König <christian.koenig@amd.com>
> ---
>   amdgpu/Makefile.sources |  4 +++-
>   amdgpu/handle_table.c   | 59 +++++++++++++++++++++++++++++++++++++++++++++++++
>   amdgpu/handle_table.h   | 40 +++++++++++++++++++++++++++++++++
>   3 files changed, 102 insertions(+), 1 deletion(-)
>   create mode 100644 amdgpu/handle_table.c
>   create mode 100644 amdgpu/handle_table.h
>
> diff --git a/amdgpu/Makefile.sources b/amdgpu/Makefile.sources
> index 498b64cc..62577ba5 100644
> --- a/amdgpu/Makefile.sources
> +++ b/amdgpu/Makefile.sources
> @@ -10,7 +10,9 @@ LIBDRM_AMDGPU_FILES := \
>   	util_hash.c \
>   	util_hash.h \
>   	util_hash_table.c \
> -	util_hash_table.h
> +	util_hash_table.h \
> +	handle_table.c \
> +	handle_table.h
>
>   LIBDRM_AMDGPU_H_FILES := \
>   	amdgpu.h
> diff --git a/amdgpu/handle_table.c b/amdgpu/handle_table.c
> new file mode 100644
> index 00000000..9acc44d5
> --- /dev/null
> +++ b/amdgpu/handle_table.c
> @@ -0,0 +1,59 @@
> +/*
> + * Copyright 2018 Advanced Micro Devices, Inc.
> + *
> + * 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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.
> + *
> + */
> +
> +#include <stdlib.h>
> +#include <string.h>
> +#include <errno.h>
> +#include "handle_table.h"
> +#include "util_math.h"
> +
> +drm_private int handle_table_insert(struct handle_table *table, uint32_t key,
> +				    void *value)
> +{
> +	if (key >= table->max_key) {
> +		uint32_t max_key = ALIGN(key, 512);
> +		void **values;
> +
> +		values = realloc(table->values, max_key * sizeof(void *));
> +		if (!values)
> +			return -ENOMEM;
> +
> +		memset(values + table->max_key, 0, (max_key - table->max_key) *
> +		       sizeof(void *));
> +
> +		table->max_key = max_key;
> +		table->values = values;
> +	}
> +	table->values[key] = value;
> +	return 0;
> +}
> +
> +drm_private void handle_table_remove(struct handle_table *table, uint32_t key)
> +{
> +	table->values[key] = NULL;
> +}

Not sure if there are too many handles for all devices, since we don't free the memory.
please confirm that.

Apart from that and typo, the series looks good for me.

Reviewed-by: Junwei Zhang <Jerry.Zhang@amd.com>

When I try to re-implement the find bo API, the game has regression issue.
I have to verify it when it's ready.
Then send out the patch again.

Jerry

> +
> +drm_private void *handle_table_lockup(struct handle_table *table, uint32_t key)
> +{
> +	return table->values[key];
> +}
> diff --git a/amdgpu/handle_table.h b/amdgpu/handle_table.h
> new file mode 100644
> index 00000000..9a170445
> --- /dev/null
> +++ b/amdgpu/handle_table.h
> @@ -0,0 +1,40 @@
> +/*
> + * Copyright 2018 Advanced Micro Devices, Inc.
> + *
> + * 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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 _HANDLE_TABLE_H_
> +#define _HANDLE_TABLE_H_
> +
> +#include <stdint.h>
> +#include "libdrm_macros.h"
> +
> +struct handle_table {
> +	uint32_t	max_key;
> +	void		**values;
> +};
> +
> +drm_private int handle_table_insert(struct handle_table *table, uint32_t key,
> +				    void *value);
> +drm_private void handle_table_remove(struct handle_table *table, uint32_t key);
> +drm_private void *handle_table_lockup(struct handle_table *table, uint32_t key);
> +
> +#endif /* _HANDLE_TABLE_H_ */
>
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