[igt-dev] [PATCH i-g-t 1/2] lib/i915/intel_memory_region: Add gem_has_smallbar

Nirmoy Das
2023-01-20T10:07:58Z

Add gem_has_smallbar() to detect a device with smallbar.

Signed-off-by: Nirmoy Das <nirmoy.das@intel.com>
---
lib/i915/intel_memory_region.c | 32 ++++++++++++++++++++++++++++++++
lib/i915/intel_memory_region.h | 1 +
2 files changed, 33 insertions(+)

diff --git a/lib/i915/intel_memory_region.c b/lib/i915/intel_memory_region.c
index 84e1bceb3..655720819 100644
--- a/lib/i915/intel_memory_region.c
+++ b/lib/i915/intel_memory_region.c
@@ -183,6 +183,38 @@ bool gem_has_lmem(int fd)
return gem_get_lmem_region_count(fd) > 0;
}

+/**
+ * gem_has_smallbar:
+ * @fd: open i915 drm file descriptor
+ *
+ * Helper function to check if the device comes with small-bar.
+ *
+ * Returns: True if at least one lmem region was found.
+ */
+bool gem_has_smallbar(int fd)
+{
+ struct drm_i915_query_memory_regions *info;
+ struct drm_i915_memory_region_info *rf;
+ bool ret = false;
+
+ info = gem_get_query_memory_regions(fd);
+ igt_assert(info);
+
+ for (int i = 0; i < info->num_regions; i++) {
+ rf = &info->regions[i];
+ if (rf->region.memory_class == I915_MEMORY_CLASS_DEVICE) {
+ if (rf->probed_size > rf->probed_cpu_visible_size) {
+ ret = true;
+ break;
+ }
+ }
+ }
+ free(info);
+
+ return ret;
+}
+
+
/* A version of gem_create_in_memory_region_list which can be allowed to
fail so that the object creation can be retried */
int __gem_create_in_memory_region_list(int fd, uint32_t *handle, uint64_t *size, uint32_t flags,
diff --git a/lib/i915/intel_memory_region.h b/lib/i915/intel_memory_region.h
index 425bda0ec..9e24bd8fb 100644
--- a/lib/i915/intel_memory_region.h
+++ b/lib/i915/intel_memory_region.h
@@ -62,6 +62,7 @@ struct drm_i915_query_memory_regions *gem_get_query_memory_regions(int fd);
unsigned int gem_get_lmem_region_count(int fd);

bool gem_has_lmem(int fd);
+bool gem_has_smallbar(int fd);

int __gem_create_in_memory_region_list(int fd, uint32_t *handle, uint64_t *size, uint32_t flags,
const struct drm_i915_gem_memory_class_instance *mem_regions,
--
2.39.0