intel: Export total subslice and EU counts

Update kernel interface with new I915_GETPARAM ioctl entries for
subslice total and EU total. Add a wrapping function for each
parameter. Userspace drivers need these values when constructing
GPGPU commands. This kernel query method is intended to replace
the PCI ID-based tables that userspace drivers currently maintain.
The kernel driver can employ fuse register reads as needed to
ensure the most accurate determination of GT config attributes.
This first became important with Cherryview in which the config
could differ between devices with the same PCI ID.

The kernel detection of these values is device-specific. Userspace
drivers should continue to maintain ID-based tables for older
devices which return ENODEV when using this query.

v2: remove unnecessary include of <stdbool.h> and increment the
    I915_GETPARAM indices to match updated kernel patch.

For: VIZ-4636
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Jeff McGee <jeff.mcgee@intel.com>
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>

3 files changed, 36 insertions, 0 deletions

diff --git a/include/drm/i915_drm.h b/include/drm/i915_drm.h
index 15dd01d4..b037e569 100644
--- a/include/drm/i915_drm.h
+++ b/include/drm/i915_drm.h
@@ -340,6 +340,8 @@ typedef struct drm_i915_irq_wait {
 #define I915_PARAM_HAS_EXEC_HANDLE_LUT   26
 #define I915_PARAM_HAS_WT     	 	 27
 #define I915_PARAM_CMD_PARSER_VERSION	 28
+#define I915_PARAM_SUBSLICE_TOTAL	 33
+#define I915_PARAM_EU_TOTAL		 34
 
 typedef struct drm_i915_getparam {
 	int param;
diff --git a/intel/intel_bufmgr.h b/intel/intel_bufmgr.h
index be83a56a..285919e4 100644
--- a/intel/intel_bufmgr.h
+++ b/intel/intel_bufmgr.h
@@ -264,6 +264,9 @@ int drm_intel_get_reset_stats(drm_intel_context *ctx,
 			      uint32_t *active,
 			      uint32_t *pending);
 
+int drm_intel_get_subslice_total(int fd, unsigned int *subslice_total);
+int drm_intel_get_eu_total(int fd, unsigned int *eu_total);
+
 /** @{ Compatibility defines to keep old code building despite the symbol rename
  * from dri_* to drm_intel_*
  */
diff --git a/intel/intel_bufmgr_gem.c b/intel/intel_bufmgr_gem.c
index acbfd4ad..5a67f53a 100644
--- a/intel/intel_bufmgr_gem.c
+++ b/intel/intel_bufmgr_gem.c
@@ -3295,6 +3295,37 @@ drm_intel_reg_read(drm_intel_bufmgr *bufmgr,
 	return ret;
 }
 
+drm_public int
+drm_intel_get_subslice_total(int fd, unsigned int *subslice_total)
+{
+	drm_i915_getparam_t gp;
+	int ret;
+
+	memclear(gp);
+	gp.value = (int*)subslice_total;
+	gp.param = I915_PARAM_SUBSLICE_TOTAL;
+	ret = drmIoctl(fd, DRM_IOCTL_I915_GETPARAM, &gp);
+	if (ret)
+		return -errno;
+
+	return 0;
+}
+
+drm_public int
+drm_intel_get_eu_total(int fd, unsigned int *eu_total)
+{
+	drm_i915_getparam_t gp;
+	int ret;
+
+	memclear(gp);
+	gp.value = (int*)eu_total;
+	gp.param = I915_PARAM_EU_TOTAL;
+	ret = drmIoctl(fd, DRM_IOCTL_I915_GETPARAM, &gp);
+	if (ret)
+		return -errno;
+
+	return 0;
+}
 
 /**
  * Annotate the given bo for use in aub dumping.