intel: Mark up with valgrind intrinsics to reduce false positives

In particular, declare the hidden CPU mmaps to valgrind so that it knows
about those memory regions.

v2: Add an additional VG_CLEAR for the getparam

References: https://bugs.freedesktop.org/show_bug.cgi?id=35071
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Ben Widawsky <ben@bwidawsk.net>
[anholt: Ideally valgrind should just learn about the ioctls, and
         removing the clear for the non-valgrindified code feels risky.]
Reviewed-by: Eric Anholt <eric@anholt.net>

diff --git a/configure.ac b/configure.ac
index 6784566..d72874b 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -261,6 +261,9 @@ if test "x$INTEL" != "xno" -o "x$RADEON" != "xno"; then
     fi
 fi
 
+PKG_CHECK_MODULES(VALGRIND, [valgrind],
+                 AC_DEFINE([HAVE_VALGRIND], 1, [Use valgrind intrinsics to suppress false warings]),)
+
 AM_CONDITIONAL(HAVE_INTEL, [test "x$INTEL" != "xno"])
 AM_CONDITIONAL(HAVE_RADEON, [test "x$RADEON" != "xno"])
 if test "x$RADEON" = xyes; then

diff --git a/intel/Makefile.am b/intel/Makefile.am
index 7225a78..06362b6 100644 (file)
--- a/intel/Makefile.am
+++ b/intel/Makefile.am
@@ -28,6 +28,7 @@ AM_CFLAGS = \
        -I$(top_srcdir)/intel \
        $(PTHREADSTUBS_CFLAGS) \
        $(PCIACCESS_CFLAGS) \
+       $(VALGRIND_CFLAGS) \
        -I$(top_srcdir)/include/drm
 
 libdrm_intel_la_LTLIBRARIES = libdrm_intel.la

diff --git a/intel/intel_bufmgr_gem.c b/intel/intel_bufmgr_gem.c
index 187e8ec..2e65580 100644 (file)
--- a/intel/intel_bufmgr_gem.c
+++ b/intel/intel_bufmgr_gem.c
@@ -62,6 +62,16 @@
 
 #include "i915_drm.h"
 
+#ifdef HAVE_VALGRIND
+#include <valgrind.h>
+#include <memcheck.h>
+#define VG(x) x
+#else
+#define VG(x)
+#endif
+
+#define VG_CLEAR(s) VG(memset(&s, 0, sizeof(s)))
+
 #define DBG(...) do {                                  \
        if (bufmgr_gem->bufmgr.debug)                   \
                fprintf(stderr, __VA_ARGS__);           \
@@ -539,7 +549,7 @@ drm_intel_gem_bo_busy(drm_intel_bo *bo)
        struct drm_i915_gem_busy busy;
        int ret;
 
-       memset(&busy, 0, sizeof(busy));
+       VG_CLEAR(busy);
        busy.handle = bo_gem->gem_handle;
 
        ret = drmIoctl(bufmgr_gem->fd, DRM_IOCTL_I915_GEM_BUSY, &busy);
@@ -553,6 +563,7 @@ drm_intel_gem_bo_madvise_internal(drm_intel_bufmgr_gem *bufmgr_gem,
 {
        struct drm_i915_gem_madvise madv;
 
+       VG_CLEAR(madv);
        madv.handle = bo_gem->gem_handle;
        madv.madv = state;
        madv.retained = 1;
@@ -680,7 +691,8 @@ retry:
                        return NULL;
 
                bo_gem->bo.size = bo_size;
-               memset(&create, 0, sizeof(create));
+
+               VG_CLEAR(create);
                create.size = bo_size;
 
                ret = drmIoctl(bufmgr_gem->fd,
@@ -836,7 +848,7 @@ drm_intel_bo_gem_create_from_name(drm_intel_bufmgr *bufmgr,
        if (!bo_gem)
                return NULL;
 
-       memset(&open_arg, 0, sizeof(open_arg));
+       VG_CLEAR(open_arg);
        open_arg.name = handle;
        ret = drmIoctl(bufmgr_gem->fd,
                       DRM_IOCTL_GEM_OPEN,
@@ -859,7 +871,7 @@ drm_intel_bo_gem_create_from_name(drm_intel_bufmgr *bufmgr,
        bo_gem->global_name = handle;
        bo_gem->reusable = false;
 
-       memset(&get_tiling, 0, sizeof(get_tiling));
+       VG_CLEAR(get_tiling);
        get_tiling.handle = bo_gem->gem_handle;
        ret = drmIoctl(bufmgr_gem->fd,
                       DRM_IOCTL_I915_GEM_GET_TILING,
@@ -890,6 +902,7 @@ drm_intel_gem_bo_free(drm_intel_bo *bo)
 
        DRMLISTDEL(&bo_gem->vma_list);
        if (bo_gem->mem_virtual) {
+               VG(VALGRIND_FREELIKE_BLOCK(bo_gem->mem_virtual, 0));
                munmap(bo_gem->mem_virtual, bo_gem->bo.size);
                bufmgr_gem->vma_count--;
        }
@@ -899,7 +912,7 @@ drm_intel_gem_bo_free(drm_intel_bo *bo)
        }
 
        /* Close this object */
-       memset(&close, 0, sizeof(close));
+       VG_CLEAR(close);
        close.handle = bo_gem->gem_handle;
        ret = drmIoctl(bufmgr_gem->fd, DRM_IOCTL_GEM_CLOSE, &close);
        if (ret != 0) {
@@ -1104,7 +1117,7 @@ static int drm_intel_gem_bo_map(drm_intel_bo *bo, int write_enable)
                DBG("bo_map: %d (%s), map_count=%d\n",
                    bo_gem->gem_handle, bo_gem->name, bo_gem->map_count);
 
-               memset(&mmap_arg, 0, sizeof(mmap_arg));
+               VG_CLEAR(mmap_arg);
                mmap_arg.handle = bo_gem->gem_handle;
                mmap_arg.offset = 0;
                mmap_arg.size = bo->size;
@@ -1121,12 +1134,14 @@ static int drm_intel_gem_bo_map(drm_intel_bo *bo, int write_enable)
                        pthread_mutex_unlock(&bufmgr_gem->lock);
                        return ret;
                }
+               VG(VALGRIND_MALLOCLIKE_BLOCK(mmap_arg.addr_ptr, mmap_arg.size, 0, 1));
                bo_gem->mem_virtual = (void *)(uintptr_t) mmap_arg.addr_ptr;
        }
        DBG("bo_map: %d (%s) -> %p\n", bo_gem->gem_handle, bo_gem->name,
            bo_gem->mem_virtual);
        bo->virtual = bo_gem->mem_virtual;
 
+       VG_CLEAR(set_domain);
        set_domain.handle = bo_gem->gem_handle;
        set_domain.read_domains = I915_GEM_DOMAIN_CPU;
        if (write_enable)
@@ -1169,7 +1184,7 @@ int drm_intel_gem_bo_map_gtt(drm_intel_bo *bo)
                DBG("bo_map_gtt: mmap %d (%s), map_count=%d\n",
                    bo_gem->gem_handle, bo_gem->name, bo_gem->map_count);
 
-               memset(&mmap_arg, 0, sizeof(mmap_arg));
+               VG_CLEAR(mmap_arg);
                mmap_arg.handle = bo_gem->gem_handle;
 
                /* Get the fake offset back... */
@@ -1212,6 +1227,7 @@ int drm_intel_gem_bo_map_gtt(drm_intel_bo *bo)
            bo_gem->gtt_virtual);
 
        /* Now move it to the GTT domain so that the CPU caches are flushed */
+       VG_CLEAR(set_domain);
        set_domain.handle = bo_gem->gem_handle;
        set_domain.read_domains = I915_GEM_DOMAIN_GTT;
        set_domain.write_domain = I915_GEM_DOMAIN_GTT;
@@ -1233,7 +1249,6 @@ static int drm_intel_gem_bo_unmap(drm_intel_bo *bo)
 {
        drm_intel_bufmgr_gem *bufmgr_gem = (drm_intel_bufmgr_gem *) bo->bufmgr;
        drm_intel_bo_gem *bo_gem = (drm_intel_bo_gem *) bo;
-       struct drm_i915_gem_sw_finish sw_finish;
        int ret = 0;
 
        if (bo == NULL)
@@ -1251,11 +1266,14 @@ static int drm_intel_gem_bo_unmap(drm_intel_bo *bo)
        }
 
        if (bo_gem->mapped_cpu_write) {
+               struct drm_i915_gem_sw_finish sw_finish;
+
                /* Cause a flush to happen if the buffer's pinned for
                 * scanout, so the results show up in a timely manner.
                 * Unlike GTT set domains, this only does work if the
                 * buffer should be scanout-related.
                 */
+               VG_CLEAR(sw_finish);
                sw_finish.handle = bo_gem->gem_handle;
                ret = drmIoctl(bufmgr_gem->fd,
                               DRM_IOCTL_I915_GEM_SW_FINISH,
@@ -1292,7 +1310,7 @@ drm_intel_gem_bo_subdata(drm_intel_bo *bo, unsigned long offset,
        struct drm_i915_gem_pwrite pwrite;
        int ret;
 
-       memset(&pwrite, 0, sizeof(pwrite));
+       VG_CLEAR(pwrite);
        pwrite.handle = bo_gem->gem_handle;
        pwrite.offset = offset;
        pwrite.size = size;
@@ -1317,6 +1335,7 @@ drm_intel_gem_get_pipe_from_crtc_id(drm_intel_bufmgr *bufmgr, int crtc_id)
        struct drm_i915_get_pipe_from_crtc_id get_pipe_from_crtc_id;
        int ret;
 
+       VG_CLEAR(get_pipe_from_crtc_id);
        get_pipe_from_crtc_id.crtc_id = crtc_id;
        ret = drmIoctl(bufmgr_gem->fd,
                       DRM_IOCTL_I915_GET_PIPE_FROM_CRTC_ID,
@@ -1343,7 +1362,7 @@ drm_intel_gem_bo_get_subdata(drm_intel_bo *bo, unsigned long offset,
        struct drm_i915_gem_pread pread;
        int ret;
 
-       memset(&pread, 0, sizeof(pread));
+       VG_CLEAR(pread);
        pread.handle = bo_gem->gem_handle;
        pread.offset = offset;
        pread.size = size;
@@ -1383,6 +1402,7 @@ drm_intel_gem_bo_start_gtt_access(drm_intel_bo *bo, int write_enable)
        struct drm_i915_gem_set_domain set_domain;
        int ret;
 
+       VG_CLEAR(set_domain);
        set_domain.handle = bo_gem->gem_handle;
        set_domain.read_domains = I915_GEM_DOMAIN_GTT;
        set_domain.write_domain = write_enable ? I915_GEM_DOMAIN_GTT : 0;
@@ -1691,6 +1711,7 @@ drm_intel_gem_bo_exec(drm_intel_bo *bo, int used,
         */
        drm_intel_add_validate_buffer(bo);
 
+       VG_CLEAR(execbuf);
        execbuf.buffers_ptr = (uintptr_t) bufmgr_gem->exec_objects;
        execbuf.buffer_count = bufmgr_gem->exec_count;
        execbuf.batch_start_offset = 0;
@@ -1770,6 +1791,7 @@ drm_intel_gem_bo_mrb_exec2(drm_intel_bo *bo, int used,
         */
        drm_intel_add_validate_buffer2(bo, 0);
 
+       VG_CLEAR(execbuf);
        execbuf.buffers_ptr = (uintptr_t)bufmgr_gem->exec2_objects;
        execbuf.buffer_count = bufmgr_gem->exec_count;
        execbuf.batch_start_offset = 0;
@@ -1834,7 +1856,7 @@ drm_intel_gem_bo_pin(drm_intel_bo *bo, uint32_t alignment)
        struct drm_i915_gem_pin pin;
        int ret;
 
-       memset(&pin, 0, sizeof(pin));
+       VG_CLEAR(pin);
        pin.handle = bo_gem->gem_handle;
        pin.alignment = alignment;
 
@@ -1856,7 +1878,7 @@ drm_intel_gem_bo_unpin(drm_intel_bo *bo)
        struct drm_i915_gem_unpin unpin;
        int ret;
 
-       memset(&unpin, 0, sizeof(unpin));
+       VG_CLEAR(unpin);
        unpin.handle = bo_gem->gem_handle;
 
        ret = drmIoctl(bufmgr_gem->fd, DRM_IOCTL_I915_GEM_UNPIN, &unpin);
@@ -1942,16 +1964,18 @@ drm_intel_gem_bo_flink(drm_intel_bo *bo, uint32_t * name)
 {
        drm_intel_bufmgr_gem *bufmgr_gem = (drm_intel_bufmgr_gem *) bo->bufmgr;
        drm_intel_bo_gem *bo_gem = (drm_intel_bo_gem *) bo;
-       struct drm_gem_flink flink;
        int ret;
 
        if (!bo_gem->global_name) {
-               memset(&flink, 0, sizeof(flink));
+               struct drm_gem_flink flink;
+
+               VG_CLEAR(flink);
                flink.handle = bo_gem->gem_handle;
 
                ret = drmIoctl(bufmgr_gem->fd, DRM_IOCTL_GEM_FLINK, &flink);
                if (ret != 0)
                        return -errno;
+
                bo_gem->global_name = flink.name;
                bo_gem->reusable = false;
 
@@ -2308,6 +2332,7 @@ drm_intel_bufmgr_gem_init(int fd, int batch_size)
                        (int)bufmgr_gem->gtt_size / 1024);
        }
 
+       VG_CLEAR(gp);
        gp.param = I915_PARAM_CHIPSET_ID;
        gp.value = &bufmgr_gem->pci_device;
        ret = drmIoctl(bufmgr_gem->fd, DRM_IOCTL_I915_GETPARAM, &gp);