[Intel-gfx] [PATCH 2/3] i965: define stuff for scratch page checking in intel_screen

[Rogovin, Kevin]

Sighs, I do not know why git send-email made this into two threads, but there it is.

Worse, the second patch was from an older version; the one posted lacks the write to the
scratch page with noise.

At any rate, the thing is also on github at https://github.com/krogueintel/asem/tree/out-of-bounds-write-detect 
which has the initialization of the scratch page with noise.

-Kevin

-----Original Message-----
From: Rogovin, Kevin 
Sent: Tuesday, December 5, 2017 9:48 AM
To: intel-gfx at lists.freedesktop.org
Cc: Rogovin, Kevin <kevin.rogovin at intel.com>
Subject: [PATCH 2/3] i965: define stuff for scratch page checking in intel_screen

From: Kevin Rogovin <kevin.rogovin at intel.com>

---
 src/intel/common/gen_debug.c             |  1 +
 src/intel/common/gen_debug.h             |  1 +
 src/mesa/drivers/dri/i965/intel_screen.c | 26 ++++++++++++++++++++++++++  src/mesa/drivers/dri/i965/intel_screen.h | 12 ++++++++++++
 4 files changed, 40 insertions(+)

diff --git a/src/intel/common/gen_debug.c b/src/intel/common/gen_debug.c index f58c593c44..7bd6723311 100644
--- a/src/intel/common/gen_debug.c
+++ b/src/intel/common/gen_debug.c
@@ -84,6 +84,7 @@ static const struct debug_control debug_control[] = {
    { "nohiz",       DEBUG_NO_HIZ },
    { "color",       DEBUG_COLOR },
    { "reemit",      DEBUG_REEMIT },
+   { "check_scratch", DEBUG_CHECK_SCRATH },
    { NULL,    0 }
 };
 
diff --git a/src/intel/common/gen_debug.h b/src/intel/common/gen_debug.h index e418e3fb16..5e224a45f0 100644
--- a/src/intel/common/gen_debug.h
+++ b/src/intel/common/gen_debug.h
@@ -83,6 +83,7 @@ extern uint64_t INTEL_DEBUG;
 #define DEBUG_NO_HIZ              (1ull << 39)
 #define DEBUG_COLOR               (1ull << 40)
 #define DEBUG_REEMIT              (1ull << 41)
+#define DEBUG_CHECK_SCRATH        (1ull << 42)
 
 #ifdef HAVE_ANDROID_PLATFORM
 #define LOG_TAG "INTEL-MESA"
diff --git a/src/mesa/drivers/dri/i965/intel_screen.c b/src/mesa/drivers/dri/i965/intel_screen.c
index 38769babf0..044be8fe85 100644
--- a/src/mesa/drivers/dri/i965/intel_screen.c
+++ b/src/mesa/drivers/dri/i965/intel_screen.c
@@ -1557,6 +1557,12 @@ intelDestroyScreen(__DRIscreen * sPriv)
    brw_bufmgr_destroy(screen->bufmgr);
    driDestroyOptionInfo(&screen->optionCache);
 
+   if (screen->debug_batchbuffer.enabled) {
+      simple_mtx_destroy(&screen->debug_batchbuffer.mutex);
+      free(screen->debug_batchbuffer.noise_values);
+      free(screen->debug_batchbuffer.tmp);
+   }
+
    ralloc_free(screen);
    sPriv->driverPrivate = NULL;
 }
@@ -2610,6 +2616,26 @@ __DRIconfig **intelInitScreen2(__DRIscreen *dri_screen)
       }
    }
 
+   screen->debug_batchbuffer.enabled = false;
+   if (INTEL_DEBUG & DEBUG_CHECK_SCRATH) {
+      struct drm_i915_scratch_page sc;
+      int err;
+
+      sc.buffer_size = 0;
+      sc.buffer_ptr = 0;
+      err = drmIoctl(dri_screen->fd, DRM_IOCTL_I915_READ_SCRATCH_PAGE, &sc);
+      if (err == 0) {
+         screen->debug_batchbuffer.enabled = true;
+         simple_mtx_init(&screen->debug_batchbuffer.mutex, mtx_plain);
+         screen->debug_batchbuffer.buffer_size = sc.buffer_size;
+         screen->debug_batchbuffer.noise_values = calloc(screen->debug_batchbuffer.buffer_size, 1);
+         screen->debug_batchbuffer.tmp = calloc(screen->debug_batchbuffer.buffer_size, 1);
+         for (uint64_t i = 0; i < screen->debug_batchbuffer.buffer_size; ++i) {
+            screen->debug_batchbuffer.noise_values[i] = rand() & 0xFF;
+         }
+      }
+   }
+
    return (const __DRIconfig**) intel_screen_make_configs(dri_screen);
 }
 
diff --git a/src/mesa/drivers/dri/i965/intel_screen.h b/src/mesa/drivers/dri/i965/intel_screen.h
index 7948617b7f..7d56106aa2 100644
--- a/src/mesa/drivers/dri/i965/intel_screen.h
+++ b/src/mesa/drivers/dri/i965/intel_screen.h
@@ -37,6 +37,7 @@
 #include "common/gen_device_info.h"
 #include "i915_drm.h"
 #include "util/xmlconfig.h"
+#include "util/simple_mtx.h"
 
 #include "isl/isl.h"
 
@@ -114,6 +115,17 @@ struct intel_screen
     */
    int eu_total;
 
+   /**
+    * Struct to perform out-of-bound GEM BO write checking
+    */
+   struct {
+      bool enabled;
+      simple_mtx_t mutex;
+      uint32_t buffer_size;
+      uint8_t *noise_values;
+      uint8_t *tmp;
+   } debug_batchbuffer;
+
    bool mesa_format_supports_texture[MESA_FORMAT_COUNT];
    bool mesa_format_supports_render[MESA_FORMAT_COUNT];
    enum isl_format mesa_to_isl_render_format[MESA_FORMAT_COUNT];
--
2.15.0