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include: Move ascii85 functions from i915 to linux/ascii85.h 

The i915 DRM driver very cleverly used ascii85 encoding for their
GPU state file. Move the encode functions to a general header file to
support other drivers that might be interested in the same
functionality.

v4: Make the return value const char * as suggested by Chris Wilson
v3: Fix error_puts -> err_puts pointed out by the 01.org bot
v2: Update API to be cleaner for the caller as suggested by Chris Wilson

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>
This commit is contained in:
Jordan Crouse 2018-07-24 10:33:19 -06:00 committed by Rob Clark
parent 2f2eb723b5
commit 489cae632f
2 changed files with 42 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
drivers/gpu/drm/i915/i915_gpu_error.c
View File

@ -31,6 +31,7 @@
#include <linux/stop_machine.h>
#include <linux/zlib.h>
#include <drm/drm_print.h>
#include <linux/ascii85.h>
#include "i915_gpu_error.h"
#include "i915_drv.h"
@ -517,35 +518,12 @@ void i915_error_printf(struct drm_i915_error_state_buf *e, const char *f, ...)
va_end(args);
}
static int
ascii85_encode_len(int len)
{
return DIV_ROUND_UP(len, 4);
}
static bool
ascii85_encode(u32 in, char *out)
{
int i;
if (in == 0)
return false;
out[5] = '\0';
for (i = 5; i--; ) {
out[i] = '!' + in % 85;
in /= 85;
}
return true;
}
static void print_error_obj(struct drm_i915_error_state_buf *m,
struct intel_engine_cs *engine,
const char *name,
struct drm_i915_error_object *obj)
{
char out[6];
char out[ASCII85_BUFSZ];
int page;
if (!obj)
@ -567,12 +545,8 @@ static void print_error_obj(struct drm_i915_error_state_buf *m,
len -= obj->unused;
len = ascii85_encode_len(len);
for (i = 0; i < len; i++) {
if (ascii85_encode(obj->pages[page][i], out))
err_puts(m, out);
else
err_puts(m, "z");
}
for (i = 0; i < len; i++)
err_puts(m, ascii85_encode(obj->pages[page][i], out));
}
err_puts(m, "\n");
}

38
include/linux/ascii85.h Normal file
View File

@ -0,0 +1,38 @@
/*
* SPDX-License-Identifier: GPL-2.0
*
* Copyright (c) 2008 Intel Corporation
* Copyright (c) 2018 The Linux Foundation. All rights reserved.
*/
#ifndef _ASCII85_H_
#define _ASCII85_H_
#include <linux/kernel.h>
#define ASCII85_BUFSZ 6
static inline long
ascii85_encode_len(long len)
{
return DIV_ROUND_UP(len, 4);
}
static inline const char *
ascii85_encode(u32 in, char *out)
{
int i;
if (in == 0)
return "z";
out[5] = '\0';
for (i = 5; i--; ) {
out[i] = '!' + in % 85;
in /= 85;
}
return out;
}
#endif