[igt-dev] [PATCH i-g-t v2 1/4] lib/i915/gem_mman: add mmap_offset support

Zbigniew Kempczyński
2019-11-19T16:02:42Z

From: Lukasz Kalamarz <lukasz.kalamarz@intel.com>

With introduction of LMEM concept new IOCTL call were implemented
- gem_mmap_offset. This patch add support in IGT for it.

Signed-off-by: Lukasz Kalamarz <lukasz.kalamarz@intel.com>
Signed-off-by: Antonio Argenziano <antonio.argenziano@intel.com>
Signed-off-by: Zbigniew Kempczyński <zbigniew.kempczynski@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
---
lib/i915/gem_mman.c | 178 ++++++++++++++++++++++++++++++++++----------
lib/i915/gem_mman.h | 39 +++++++++-
2 files changed, 177 insertions(+), 40 deletions(-)

diff --git a/lib/i915/gem_mman.c b/lib/i915/gem_mman.c
index 6256627b..920f9ca5 100644
--- a/lib/i915/gem_mman.c
+++ b/lib/i915/gem_mman.c
@@ -40,6 +40,44 @@
#define VG(x) do {} while (0)
#endif

+#define LOCAL_I915_PARAM_MMAP_OFFSET_VERSION 54
+
+static bool gem_has_mmap_offset(int fd)
+{
+ int has_mmap_offset = 0;
+ struct drm_i915_getparam gp;
+
+ memset(&gp, 0, sizeof(gp));
+ gp.param = LOCAL_I915_PARAM_MMAP_OFFSET_VERSION;
+ gp.value = &has_mmap_offset;
+ ioctl(fd, DRM_IOCTL_I915_GETPARAM, &gp);
+
+ return has_mmap_offset > 0;
+}
+
+void gem_require_mmap_offset(int i915)
+{
+ igt_require(gem_has_mmap_offset(i915));
+}
+
+static int gem_mmap_gtt_version(int fd)
+{
+ struct drm_i915_getparam gp;
+ int gtt_version = -1;
+
+ memset(&gp, 0, sizeof(gp));
+ gp.param = I915_PARAM_MMAP_GTT_VERSION;
+ gp.value = &gtt_version;
+ ioctl(fd, DRM_IOCTL_I915_GETPARAM, &gp);
+
+ return gtt_version;
+}
+
+bool gem_mmap_has_gtt(int fd)
+{
+ return gem_mmap_gtt_version(fd) > 0;
+}
+
/**
* __gem_mmap__gtt:
* @fd: open i915 drm file descriptor
@@ -101,46 +139,63 @@ int gem_munmap(void *ptr, uint64_t size)
return ret;
}

-bool gem_mmap__has_wc(int fd)
+bool __gem_mmap__has_wc(int fd)
{
- static int has_wc = -1;
-
- if (has_wc == -1) {
- struct drm_i915_getparam gp;
- int mmap_version = -1;
- int gtt_version = -1;
-
- has_wc = 0;
-
- memset(&gp, 0, sizeof(gp));
- gp.param = I915_PARAM_MMAP_GTT_VERSION;
- gp.value = &gtt_version;
- ioctl(fd, DRM_IOCTL_I915_GETPARAM, &gp);
-
- memset(&gp, 0, sizeof(gp));
- gp.param = I915_PARAM_MMAP_VERSION;
- gp.value = &mmap_version;
- ioctl(fd, DRM_IOCTL_I915_GETPARAM, &gp);
-
- /* Do we have the new mmap_ioctl with DOMAIN_WC? */
- if (mmap_version >= 1 && gtt_version >= 2) {
- struct drm_i915_gem_mmap arg;
-
- /* Does this device support wc-mmaps ? */
- memset(&arg, 0, sizeof(arg));
- arg.handle = gem_create(fd, 4096);
- arg.offset = 0;
- arg.size = 4096;
- arg.flags = I915_MMAP_WC;
- has_wc = igt_ioctl(fd, DRM_IOCTL_I915_GEM_MMAP, &arg) == 0;
- gem_close(fd, arg.handle);
- }
- errno = 0;
+ int has_wc = 0;
+
+ struct drm_i915_getparam gp;
+ int mmap_version = -1;
+
+ memset(&gp, 0, sizeof(gp));
+ gp.param = I915_PARAM_MMAP_VERSION;
+ gp.value = &mmap_version;
+ ioctl(fd, DRM_IOCTL_I915_GETPARAM, &gp);
+
+ /* Do we have the mmap_ioctl with DOMAIN_WC? */
+ if (mmap_version >= 1 && gem_mmap_gtt_version(fd) >= 2) {
+ struct drm_i915_gem_mmap arg;
+
+ /* Does this device support wc-mmaps ? */
+ memset(&arg, 0, sizeof(arg));
+ arg.handle = gem_create(fd, 4096);
+ arg.offset = 0;
+ arg.size = 4096;
+ arg.flags = I915_MMAP_WC;
+ has_wc = igt_ioctl(fd, DRM_IOCTL_I915_GEM_MMAP, &arg) == 0;
+ gem_close(fd, arg.handle);
+ }
+ errno = 0;
+
+ return has_wc > 0;
+}
+
+bool __gem_mmap_offset__has_wc(int fd)
+{
+ int has_wc = 0;
+
+ if (gem_has_mmap_offset(fd)) {
+ struct local_i915_gem_mmap_offset arg;
+
+ /* Does this device support wc-mmaps ? */
+ memset(&arg, 0, sizeof(arg));
+ arg.handle = gem_create(fd, 4096);
+ arg.offset = 0;
+ arg.flags = LOCAL_I915_MMAP_OFFSET_WC;
+ has_wc = igt_ioctl(fd, LOCAL_IOCTL_I915_GEM_MMAP_OFFSET,
+ &arg) == 0;
+ gem_close(fd, arg.handle);
}

+ errno = 0;
+
return has_wc > 0;
}

+bool gem_mmap__has_wc(int fd)
+{
+ return __gem_mmap_offset__has_wc(fd) || __gem_mmap__has_wc(fd);
+}
+
/**
* __gem_mmap:
* @fd: open i915 drm file descriptor
@@ -157,8 +212,8 @@ bool gem_mmap__has_wc(int fd)
*
* Returns: A pointer to the created memory mapping, NULL on failure.
*/
-static void
-*__gem_mmap(int fd, uint32_t handle, uint64_t offset, uint64_t size, unsigned int prot, uint64_t flags)
+void *__gem_mmap(int fd, uint32_t handle, uint64_t offset, uint64_t size,
+ unsigned int prot, uint64_t flags)
{
struct drm_i915_gem_mmap arg;

@@ -177,6 +232,43 @@ static void
return from_user_pointer(arg.addr_ptr);
}

+/**
+ * __gem_mmap_offset:
+ * @fd: open i915 drm file descriptor
+ * @handle: gem buffer object handle
+ * @offset: offset in the gem buffer of the mmap arena
+ * @size: size of the mmap arena
+ * @prot: memory protection bits as used by mmap()
+ * @flags: flags used to determine caching
+ *
+ * Similar to __gem_mmap but use MMAP_OFFSET IOCTL.
+ *
+ * Returns: A pointer to the created memory mapping, NULL on failure.
+ */
+void *__gem_mmap_offset(int fd, uint32_t handle, uint64_t offset, uint64_t size,
+ unsigned int prot, uint64_t flags)
+{
+ struct local_i915_gem_mmap_offset arg;
+ void *ptr;
+
+ memset(&arg, 0, sizeof(arg));
+ arg.handle = handle;
+ arg.offset = offset;
+ arg.flags = flags;
+
+ if (igt_ioctl(fd, LOCAL_IOCTL_I915_GEM_MMAP_OFFSET, &arg))
+ return NULL;
+
+ ptr = mmap64(0, size, prot, MAP_SHARED, fd, arg.offset);
+
+ if (ptr == MAP_FAILED)
+ ptr = NULL;
+ else
+ errno = 0;
+
+ return ptr;
+}
+
/**
* __gem_mmap__wc:
* @fd: open i915 drm file descriptor
@@ -205,13 +297,17 @@ void *__gem_mmap__wc(int fd, uint32_t handle, uint64_t offset, uint64_t size, un
* @size: size of the mmap arena
* @prot: memory protection bits as used by mmap()
*
- * Like __gem_mmap__wc() except we assert on failure.
+ * Try to __gem_mmap_offset, then __gem_mmap__wc(). Assert on failure.
*
* Returns: A pointer to the created memory mapping
*/
void *gem_mmap__wc(int fd, uint32_t handle, uint64_t offset, uint64_t size, unsigned prot)
{
- void *ptr = __gem_mmap__wc(fd, handle, offset, size, prot);
+ void *ptr = __gem_mmap_offset(fd, handle, offset, size, prot,
+ LOCAL_I915_MMAP_OFFSET_WC);
+ if (!ptr)
+ ptr = __gem_mmap__wc(fd, handle, offset, size, prot);
+
igt_assert(ptr);
return ptr;
}
@@ -248,7 +344,11 @@ void *__gem_mmap__cpu(int fd, uint32_t handle, uint64_t offset, uint64_t size, u
*/
void *gem_mmap__cpu(int fd, uint32_t handle, uint64_t offset, uint64_t size, unsigned prot)
{
- void *ptr = __gem_mmap__cpu(fd, handle, offset, size, prot);
+ void *ptr = __gem_mmap_offset(fd, handle, offset, size, prot,
+ LOCAL_I915_MMAP_OFFSET_WB);
+ if (!ptr)
+ ptr = __gem_mmap__cpu(fd, handle, offset, size, prot);
+
igt_assert(ptr);
return ptr;
}
diff --git a/lib/i915/gem_mman.h b/lib/i915/gem_mman.h
index 096ff592..e4c954c6 100644
--- a/lib/i915/gem_mman.h
+++ b/lib/i915/gem_mman.h
@@ -25,12 +25,45 @@
#ifndef GEM_MMAN_H
#define GEM_MMAN_H

+#define LOCAL_I915_GEM_MMAP_OFFSET DRM_I915_GEM_MMAP_GTT
+#define LOCAL_IOCTL_I915_GEM_MMAP_OFFSET DRM_IOWR(DRM_COMMAND_BASE + \
+ LOCAL_I915_GEM_MMAP_OFFSET, struct local_i915_gem_mmap_offset)
+
+struct local_i915_gem_mmap_offset {
+ /** Handle for the object being mapped. */
+ __u32 handle;
+ __u32 pad;
+ /**
+ * Fake offset to use for subsequent mmap call
+ *
+ * This is a fixed-size type for 32/64 compatibility.
+ */
+ __u64 offset;
+ /**
+ * Flags for extended behaviour.
+ *
+ * It is mandatory that either one of the _WC/_WB flags
+ * should be passed here.
+ */
+ __u64 flags;
+#define LOCAL_I915_MMAP_OFFSET_WC (1 << 0)
+#define LOCAL_I915_MMAP_OFFSET_WB (1 << 1)
+#define LOCAL_I915_MMAP_OFFSET_UC (1 << 2)
+#define LOCAL_I915_MMAP_OFFSET_FLAGS \
+ (LOCAL_I915_MMAP_OFFSET_WC | LOCAL_I915_MMAP_OFFSET_WB | LOCAL_I915_MMAP_OFFSET_UC)
+};
+
+void gem_require_mmap_offset(int i915);
+bool gem_mmap_has_gtt(int fd);
+
void *gem_mmap__gtt(int fd, uint32_t handle, uint64_t size, unsigned prot);
void *gem_mmap__cpu(int fd, uint32_t handle, uint64_t offset, uint64_t size, unsigned prot);

+bool __gem_mmap__has_wc(int fd);
+bool __gem_mmap_offset__has_wc(int fd);
bool gem_mmap__has_wc(int fd);
void *gem_mmap__wc(int fd, uint32_t handle, uint64_t offset, uint64_t size, unsigned prot);
-
+void *gem_mmap_offset__wc(int fd, uint32_t handle, uint64_t offset, uint64_t size, unsigned prot);
#ifndef I915_GEM_DOMAIN_WC
#define I915_GEM_DOMAIN_WC 0x80
#endif
@@ -38,6 +71,10 @@ void *gem_mmap__wc(int fd, uint32_t handle, uint64_t offset, uint64_t size, unsi
bool gem_has_mappable_ggtt(int i915);
void gem_require_mappable_ggtt(int i915);

+void *__gem_mmap(int fd, uint32_t handle, uint64_t offset, uint64_t size,
+ unsigned int prot, uint64_t flags);
+void *__gem_mmap_offset(int fd, uint32_t handle, uint64_t offset, uint64_t size,
+ unsigned int prot, uint64_t flags);
void *__gem_mmap__gtt(int fd, uint32_t handle, uint64_t size, unsigned prot);
void *__gem_mmap__cpu(int fd, uint32_t handle, uint64_t offset, uint64_t size, unsigned prot);
void *__gem_mmap__wc(int fd, uint32_t handle, uint64_t offset, uint64_t size, unsigned prot);
--
2.23.0