[PATCH 01/10] include: Move ascii85 functions from i915 to linux/ascii85.h

[PATCH 01/10] include: Move ascii85 functions from i915 to linux/ascii85.h

[Jordan Crouse]

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.

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
 drivers/gpu/drm/i915/i915_gpu_error.c | 35 ++++---------------------------
 include/linux/ascii85.h               | 39 +++++++++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+), 31 deletions(-)
 create mode 100644 include/linux/ascii85.h

diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index 67c902412193..969d967e58c7 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -31,7 +31,7 @@
 #include <linux/stop_machine.h>
 #include <linux/zlib.h>
 #include <drm/drm_print.h>
-
+#include <linux/ascii85.h>
 #include "i915_drv.h"
 
 static inline const struct intel_engine_cs *
@@ -518,35 +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)
@@ -568,12 +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++)
+			error_puts(m, ascii85_encode(obj->pages[page][i], out));
 	}
 	err_puts(m, "\n");
 }
diff --git a/include/linux/ascii85.h b/include/linux/ascii85.h
new file mode 100644
index 000000000000..322bbed731ae
--- /dev/null
+++ b/include/linux/ascii85.h
@@ -0,0 +1,39 @@
+
+/*
+ * SPDX-License-Identifier: GPL-2.0
+ *
+ * Copyright (c) 2008 Intel Corporation
+ * Copyright (c) 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 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
-- 
2.16.1

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Re: [PATCH 01/10] include: Move ascii85 functions from i915 to linux/ascii85.h

[Jordan Crouse]

On Thu, Apr 05, 2018 at 04:00:47PM -0600, Jordan Crouse wrote:
> 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.

In a previous version of this patch, Chris asked what tree I wanted this applied
to, and the answer is: I'm not sure?  I'm hoping that Rob will be cool with
picking the rest up for msm-next for 4.18 but I'm okay with putting this
particular patch wherever it is easiest for the maintainers.

Jordan

> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
> Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
>  drivers/gpu/drm/i915/i915_gpu_error.c | 35 ++++---------------------------
>  include/linux/ascii85.h               | 39 +++++++++++++++++++++++++++++++++++
>  2 files changed, 43 insertions(+), 31 deletions(-)
>  create mode 100644 include/linux/ascii85.h
> 
> diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
> index 67c902412193..969d967e58c7 100644
> --- a/drivers/gpu/drm/i915/i915_gpu_error.c
> +++ b/drivers/gpu/drm/i915/i915_gpu_error.c
> @@ -31,7 +31,7 @@
>  #include <linux/stop_machine.h>
>  #include <linux/zlib.h>
>  #include <drm/drm_print.h>
> -
> +#include <linux/ascii85.h>
>  #include "i915_drv.h"
>  
>  static inline const struct intel_engine_cs *
> @@ -518,35 +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)
> @@ -568,12 +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++)
> +			error_puts(m, ascii85_encode(obj->pages[page][i], out));
>  	}
>  	err_puts(m, "\n");
>  }
> diff --git a/include/linux/ascii85.h b/include/linux/ascii85.h
> new file mode 100644
> index 000000000000..322bbed731ae
> --- /dev/null
> +++ b/include/linux/ascii85.h
> @@ -0,0 +1,39 @@
> +
> +/*
> + * SPDX-License-Identifier: GPL-2.0
> + *
> + * Copyright (c) 2008 Intel Corporation
> + * Copyright (c) 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 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
> -- 
> 2.16.1
> 
> _______________________________________________
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> Freedreno@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/freedreno

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Re: [PATCH 01/10] include: Move ascii85 functions from i915 to linux/ascii85.h

[kbuild test robot]

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Hi Jordan,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on robclark/msm-next]
[also build test ERROR on v4.16 next-20180406]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Jordan-Crouse/drm-msm-GPU-crash-state/20180406-170513
base:   git://people.freedesktop.org/~robclark/linux msm-next
config: x86_64-rhel (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/gpu//drm/i915/i915_gpu_error.c: In function 'print_error_obj':
>> drivers/gpu//drm/i915/i915_gpu_error.c:549:4: error: implicit declaration of function 'error_puts'; did you mean 'err_puts'? [-Werror=implicit-function-declaration]
       error_puts(m, ascii85_encode(obj->pages[page][i], out));
       ^~~~~~~~~~
       err_puts
   cc1: some warnings being treated as errors

vim +549 drivers/gpu//drm/i915/i915_gpu_error.c

   520	
   521	static void print_error_obj(struct drm_i915_error_state_buf *m,
   522				    struct intel_engine_cs *engine,
   523				    const char *name,
   524				    struct drm_i915_error_object *obj)
   525	{
   526		char out[ASCII85_BUFSZ];
   527		int page;
   528	
   529		if (!obj)
   530			return;
   531	
   532		if (name) {
   533			err_printf(m, "%s --- %s = 0x%08x %08x\n",
   534				   engine ? engine->name : "global", name,
   535				   upper_32_bits(obj->gtt_offset),
   536				   lower_32_bits(obj->gtt_offset));
   537		}
   538	
   539		err_compression_marker(m);
   540		for (page = 0; page < obj->page_count; page++) {
   541			int i, len;
   542	
   543			len = PAGE_SIZE;
   544			if (page == obj->page_count - 1)
   545				len -= obj->unused;
   546			len = ascii85_encode_len(len);
   547	
   548			for (i = 0; i < len; i++)
 > 549				error_puts(m, ascii85_encode(obj->pages[page][i], out));
   550		}
   551		err_puts(m, "\n");
   552	}
   553	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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[PATCH 01/10] include: Move ascii85 functions from i915 to linux/ascii85.h

[Jordan Crouse]

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.

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

Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
---
 drivers/gpu/drm/i915/i915_gpu_error.c | 35 +++---------------------
 include/linux/ascii85.h               | 39 +++++++++++++++++++++++++++
 2 files changed, 43 insertions(+), 31 deletions(-)
 create mode 100644 include/linux/ascii85.h

diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index 67c902412193..d14b8041d5c7 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -31,7 +31,7 @@
 #include <linux/stop_machine.h>
 #include <linux/zlib.h>
 #include <drm/drm_print.h>
-
+#include <linux/ascii85.h>
 #include "i915_drv.h"
 
 static inline const struct intel_engine_cs *
@@ -518,35 +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)
@@ -568,12 +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");
 }
diff --git a/include/linux/ascii85.h b/include/linux/ascii85.h
new file mode 100644
index 000000000000..322bbed731ae
--- /dev/null
+++ b/include/linux/ascii85.h
@@ -0,0 +1,39 @@
+
+/*
+ * SPDX-License-Identifier: GPL-2.0
+ *
+ * Copyright (c) 2008 Intel Corporation
+ * Copyright (c) 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 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
-- 
2.17.0

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