intel: Add and use intel_gem_get_context_param()

Again sharing the same function across all Intel drivers.

There is still two additional DRM_IOCTL_I915_GEM_CONTEXT_GETPARAM
calls, one in intel/dev and other in perf.
The first one can't call intel_gem_get_context_param() because of the
build order of libs and the second one because it sets the size
parameter.

Will revisit those calls in future but this is already an improvement.

v2:
- using intel_gem_get_context_param() for the recently added query for
I915_CONTEXT_PARAM_PROTECTED_CONTENT

Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18974>

src/intel/common/intel_gem.c

@@ -173,6 +173,20 @@ intel_gem_set_context_param(int fd, uint32_t context, uint32_t param,
    return intel_ioctl(fd, DRM_IOCTL_I915_GEM_CONTEXT_SETPARAM, &p) == 0;
 }
 
+bool
+intel_gem_get_context_param(int fd, uint32_t context, uint32_t param,
+                            uint64_t *value)
+{
+   struct drm_i915_gem_context_param gp = {
+      .ctx_id = context,
+      .param = param,
+   };
+   if (intel_ioctl(fd, DRM_IOCTL_I915_GEM_CONTEXT_GETPARAM, &gp))
+      return false;
+   *value = gp.value;
+   return true;
+}
+
 bool intel_gem_read_render_timestamp(int fd, uint64_t *value)
 {
    struct drm_i915_reg_read reg_read = {

src/intel/common/intel_gem.h

@@ -169,6 +169,9 @@ intel_gem_create_context_engines(int fd,
 bool
 intel_gem_set_context_param(int fd, uint32_t context, uint32_t param,
                             uint64_t value);
+bool
+intel_gem_get_context_param(int fd, uint32_t context, uint32_t param,
+                            uint64_t *value);
 
 bool intel_gem_read_render_timestamp(int fd, uint64_t *value);