intel: fix check for 48b ppgtt support

The previous logic of the supports_48b_addresses wasn't actually
checking if i915.ko was running with full_48bit_ppgtt. The ENOENT
it was checking for was actually coming from the invalid context
id provided in the test execbuffer.  There is no path in the
kernel driver where the presence of
EXEC_OBJECT_SUPPORTS_48B_ADDRESS leads to an error.

Instead, check the default context's GTT_SIZE param for a value
greater than 4 GiB

v2 (Ken): Fix in i965 as well.
v3 Check GTT_SIZE instead of HAS_ALIASING_PPGTT (Chris Wilson)

Reviewed-by: Kenneth Graunke <[email protected]>

5 files changed, 34 insertions, 61 deletions

diff --git a/src/intel/vulkan/anv_device.c b/src/intel/vulkan/anv_device.c
index b456d3d4c52..1c5dbb5189c 100644
--- a/src/intel/vulkan/anv_device.c
+++ b/src/intel/vulkan/anv_device.c
@@ -58,23 +58,8 @@ compiler_perf_log(void *data, const char *fmt, ...)
 }
 
 static VkResult
-anv_compute_heap_size(int fd, uint64_t *heap_size)
+anv_compute_heap_size(int fd, uint64_t gtt_size, uint64_t *heap_size)
 {
-   uint64_t gtt_size;
-   if (anv_gem_get_context_param(fd, 0, I915_CONTEXT_PARAM_GTT_SIZE,
-                                 &gtt_size) == -1) {
-      /* If, for whatever reason, we can't actually get the GTT size from the
-       * kernel (too old?) fall back to the aperture size.
-       */
-      anv_perf_warn(NULL, NULL,
-                    "Failed to get I915_CONTEXT_PARAM_GTT_SIZE: %m");
-
-      if (anv_gem_get_aperture(fd, &gtt_size) == -1) {
-         return vk_errorf(NULL, NULL, VK_ERROR_INITIALIZATION_FAILED,
-                          "failed to get aperture size: %m");
-      }
-   }
-
    /* Query the total ram from the system */
    struct sysinfo info;
    sysinfo(&info);
@@ -103,15 +88,26 @@ anv_compute_heap_size(int fd, uint64_t *heap_size)
 static VkResult
 anv_physical_device_init_heaps(struct anv_physical_device *device, int fd)
 {
-   /* The kernel query only tells us whether or not the kernel supports the
-    * EXEC_OBJECT_SUPPORTS_48B_ADDRESS flag and not whether or not the
-    * hardware has actual 48bit address support.
-    */
-   device->supports_48bit_addresses =
-      (device->info.gen >= 8) && anv_gem_supports_48b_addresses(fd);
+   uint64_t gtt_size;
+   if (anv_gem_get_context_param(fd, 0, I915_CONTEXT_PARAM_GTT_SIZE,
+                                 &gtt_size) == -1) {
+      /* If, for whatever reason, we can't actually get the GTT size from the
+       * kernel (too old?) fall back to the aperture size.
+       */
+      anv_perf_warn(NULL, NULL,
+                    "Failed to get I915_CONTEXT_PARAM_GTT_SIZE: %m");
+
+      if (anv_gem_get_aperture(fd, &gtt_size) == -1) {
+         return vk_errorf(NULL, NULL, VK_ERROR_INITIALIZATION_FAILED,
+                          "failed to get aperture size: %m");
+      }
+   }
+
+   device->supports_48bit_addresses = (device->info.gen >= 8) &&
+      gtt_size > (4ULL << 30 /* GiB */);
 
    uint64_t heap_size = 0;
-   VkResult result = anv_compute_heap_size(fd, &heap_size);
+   VkResult result = anv_compute_heap_size(fd, gtt_size, &heap_size);
    if (result != VK_SUCCESS)
       return result;
 
diff --git a/src/intel/vulkan/anv_gem.c b/src/intel/vulkan/anv_gem.c
index 2a8f8b14b7e..3ba6d198a8a 100644
--- a/src/intel/vulkan/anv_gem.c
+++ b/src/intel/vulkan/anv_gem.c
@@ -377,24 +377,6 @@ anv_gem_get_aperture(int fd, uint64_t *size)
    return 0;
 }
 
-bool
-anv_gem_supports_48b_addresses(int fd)
-{
-   struct drm_i915_gem_exec_object2 obj = {
-      .flags = EXEC_OBJECT_SUPPORTS_48B_ADDRESS,
-   };
-
-   struct drm_i915_gem_execbuffer2 execbuf = {
-      .buffers_ptr = (uintptr_t)&obj,
-      .buffer_count = 1,
-      .rsvd1 = 0xffffffu,
-   };
-
-   int ret = anv_ioctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &execbuf);
-
-   return ret == -1 && errno == ENOENT;
-}
-
 int
 anv_gem_gpu_get_reset_stats(struct anv_device *device,
                             uint32_t *active, uint32_t *pending)
diff --git a/src/intel/vulkan/anv_gem_stubs.c b/src/intel/vulkan/anv_gem_stubs.c
index 0f4a3f5da00..5093bd5db1a 100644
--- a/src/intel/vulkan/anv_gem_stubs.c
+++ b/src/intel/vulkan/anv_gem_stubs.c
@@ -170,12 +170,6 @@ anv_gem_get_aperture(int fd, uint64_t *size)
    unreachable("Unused");
 }
 
-bool
-anv_gem_supports_48b_addresses(int fd)
-{
-   unreachable("Unused");
-}
-
 int
 anv_gem_gpu_get_reset_stats(struct anv_device *device,
                             uint32_t *active, uint32_t *pending)
diff --git a/src/intel/vulkan/anv_private.h b/src/intel/vulkan/anv_private.h
index 52d4ba58dc9..d8b34b149e4 100644
--- a/src/intel/vulkan/anv_private.h
+++ b/src/intel/vulkan/anv_private.h
@@ -956,7 +956,6 @@ int anv_gem_get_param(int fd, uint32_t param);
 int anv_gem_get_tiling(struct anv_device *device, uint32_t gem_handle);
 bool anv_gem_get_bit6_swizzle(int fd, uint32_t tiling);
 int anv_gem_get_aperture(int fd, uint64_t *size);
-bool anv_gem_supports_48b_addresses(int fd);
 int anv_gem_gpu_get_reset_stats(struct anv_device *device,
                                 uint32_t *active, uint32_t *pending);
 int anv_gem_handle_to_fd(struct anv_device *device, uint32_t gem_handle);
diff --git a/src/mesa/drivers/dri/i965/brw_bufmgr.c b/src/mesa/drivers/dri/i965/brw_bufmgr.c
index 8ba915b179a..7cb1f03cf07 100644
--- a/src/mesa/drivers/dri/i965/brw_bufmgr.c
+++ b/src/mesa/drivers/dri/i965/brw_bufmgr.c
@@ -1385,22 +1385,20 @@ gem_param(int fd, int name)
    return v;
 }
 
-static bool
-gem_supports_48b_addresses(int fd)
+static int
+gem_context_getparam(int fd, uint32_t context, uint64_t param, uint64_t *value)
 {
-   struct drm_i915_gem_exec_object2 obj = {
-      .flags = EXEC_OBJECT_SUPPORTS_48B_ADDRESS,
+   struct drm_i915_gem_context_param gp = {
+      .ctx_id = context,
+      .param = param,
    };
 
-   struct drm_i915_gem_execbuffer2 execbuf = {
-      .buffers_ptr = (uintptr_t)&obj,
-      .buffer_count = 1,
-      .rsvd1 = 0xffffffu,
-   };
+   if (drmIoctl(fd, DRM_IOCTL_I915_GEM_CONTEXT_GETPARAM, &gp))
+      return -1;
 
-   int ret = drmIoctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &execbuf);
+   *value = gp.value;
 
-   return ret == -1 && errno == ENOENT;
+   return 0;
 }
 
 /**
@@ -1434,10 +1432,14 @@ brw_bufmgr_init(struct gen_device_info *devinfo, int fd)
       return NULL;
    }
 
+   uint64_t gtt_size;
+   if (gem_context_getparam(fd, 0, I915_CONTEXT_PARAM_GTT_SIZE, &gtt_size))
+      gtt_size = 0;
+
    bufmgr->has_llc = devinfo->has_llc;
    bufmgr->has_mmap_wc = gem_param(fd, I915_PARAM_MMAP_VERSION) > 0;
-   bufmgr->supports_48b_addresses =
-      devinfo->gen >= 8 && gem_supports_48b_addresses(fd);
+   bufmgr->supports_48b_addresses = devinfo->gen >= 8 &&
+      gtt_size > (4ULL << 30 /* GiB */);
 
    init_cache_buckets(bufmgr);