loader: simplify codeflow in drm_get_pci_id_for_fd

[mesa.git] / src / loader / loader.c

diff --git a/src/loader/loader.c b/src/loader/loader.c
index 668e6d5184b09ecd1e09e757b746938a6c74b608..a2e726465af87726179e56b07cadb35adfbdbcc7 100644 (file)
--- a/src/loader/loader.c
+++ b/src/loader/loader.c
@@ -50,6 +50,7 @@
 
 #ifdef HAVE_LIBDRM
 #include <xf86drm.h>
+#define MAX_DRM_DEVICES 64
 #ifdef USE_DRICONF
 #include "util/xmlconfig.h"
 #include "util/xmlpool.h"
@@ -91,6 +92,10 @@ loader_open_device(const char *device_name)
       if (fd != -1)
          fcntl(fd, F_SETFD, fcntl(fd, F_GETFD) | FD_CLOEXEC);
    }
+   if (fd == -1 && errno == EACCES) {
+      log_(_LOADER_WARNING, "failed to open %s: %s\n",
+           device_name, strerror(errno));
+   }
    return fd;
 }
 
@@ -114,31 +119,28 @@ static char *loader_get_kernel_driver_name(int fd)
 #endif
 }
 
+bool
+is_kernel_i915(int fd)
+{
+   char *kernel_driver = loader_get_kernel_driver_name(fd);
+   bool is_i915 = kernel_driver && strcmp(kernel_driver, "i915") == 0;
+
+   free(kernel_driver);
+   return is_i915;
+}
+
 #if defined(HAVE_LIBDRM)
 int
 loader_open_render_node(const char *name)
 {
-   drmDevicePtr *devices, device;
-   int err, render = -ENOENT, fd;
-   unsigned int num, i;
-
-   err = drmGetDevices2(0, NULL, 0);
-   if (err < 0)
-      return err;
-
-   num = err;
+   drmDevicePtr devices[MAX_DRM_DEVICES], device;
+   int i, num_devices, fd = -1;
 
-   devices = calloc(num, sizeof(*devices));
-   if (!devices)
-      return -ENOMEM;
-
-   err = drmGetDevices2(0, devices, num);
-   if (err < 0) {
-      render = err;
-      goto free;
-   }
+   num_devices = drmGetDevices2(0, devices, MAX_DRM_DEVICES);
+   if (num_devices <= 0)
+      return -ENOENT;
 
-   for (i = 0; i < num; i++) {
+   for (i = 0; i < num_devices; i++) {
       device = devices[i];
 
       if ((device->available_nodes & (1 << DRM_NODE_RENDER)) &&
@@ -162,16 +164,15 @@ loader_open_render_node(const char *name)
          }
 
          drmFreeVersion(version);
-         render = fd;
          break;
       }
    }
+   drmFreeDevices(devices, num_devices);
 
-   drmFreeDevices(devices, num);
+   if (i == num_devices)
+      return -ENOENT;
 
-free:
-   free(devices);
-   return render;
+   return fd;
 }
 
 #ifdef USE_DRICONF
@@ -296,13 +297,10 @@ static char *drm_get_id_path_tag_for_fd(int fd)
 
 int loader_get_user_preferred_fd(int default_fd, bool *different_device)
 {
-/* Arbitrary "maximum" value of drm devices. */
-#define MAX_DRM_DEVICES 32
    const char *dri_prime = getenv("DRI_PRIME");
    char *default_tag, *prime = NULL;
    drmDevicePtr devices[MAX_DRM_DEVICES];
-   int i, num_devices, fd;
-   bool found = false;
+   int i, num_devices, fd = -1;
 
    if (dri_prime)
       prime = strdup(dri_prime);
@@ -321,44 +319,34 @@ int loader_get_user_preferred_fd(int default_fd, bool *different_device)
       goto err;
 
    num_devices = drmGetDevices2(0, devices, MAX_DRM_DEVICES);
-   if (num_devices < 0)
+   if (num_devices <= 0)
       goto err;
 
-   /* two format are supported:
-    * "1": choose any other card than the card used by default.
-    * id_path_tag: (for example "pci-0000_02_00_0") choose the card
-    * with this id_path_tag.
-    */
-   if (!strcmp(prime,"1")) {
-      /* Hmm... detection for 2-7 seems to be broken. Oh well ...
-       * Pick the first render device that is not our own.
-       */
-      for (i = 0; i < num_devices; i++) {
-         if (devices[i]->available_nodes & 1 << DRM_NODE_RENDER &&
-             !drm_device_matches_tag(devices[i], default_tag)) {
+   for (i = 0; i < num_devices; i++) {
+      if (!(devices[i]->available_nodes & 1 << DRM_NODE_RENDER))
+         continue;
 
-            found = true;
-            break;
-         }
+      /* two formats of DRI_PRIME are supported:
+       * "1": choose any other card than the card used by default.
+       * id_path_tag: (for example "pci-0000_02_00_0") choose the card
+       * with this id_path_tag.
+       */
+      if (!strcmp(prime,"1")) {
+         if (drm_device_matches_tag(devices[i], default_tag))
+            continue;
+      } else {
+         if (!drm_device_matches_tag(devices[i], prime))
+            continue;
       }
-   } else {
-      for (i = 0; i < num_devices; i++) {
-         if (devices[i]->available_nodes & 1 << DRM_NODE_RENDER &&
-            drm_device_matches_tag(devices[i], prime)) {
 
-            found = true;
-            break;
-         }
-      }
+      fd = loader_open_device(devices[i]->nodes[DRM_NODE_RENDER]);
+      break;
    }
+   drmFreeDevices(devices, num_devices);
 
-   if (!found) {
-      drmFreeDevices(devices, num_devices);
+   if (i == num_devices)
       goto err;
-   }
 
-   fd = loader_open_device(devices[i]->nodes[DRM_NODE_RENDER]);
-   drmFreeDevices(devices, num_devices);
    if (fd < 0)
       goto err;
 
@@ -397,26 +385,22 @@ static bool
 drm_get_pci_id_for_fd(int fd, int *vendor_id, int *chip_id)
 {
    drmDevicePtr device;
-   bool ret;
 
-   if (drmGetDevice2(fd, 0, &device) == 0) {
-      if (device->bustype == DRM_BUS_PCI) {
-         *vendor_id = device->deviceinfo.pci->vendor_id;
-         *chip_id = device->deviceinfo.pci->device_id;
-         ret = true;
-      }
-      else {
-         log_(_LOADER_DEBUG, "MESA-LOADER: device is not located on the PCI bus\n");
-         ret = false;
-      }
-      drmFreeDevice(&device);
-   }
-   else {
+   if (drmGetDevice2(fd, 0, &device) != 0) {
       log_(_LOADER_WARNING, "MESA-LOADER: failed to retrieve device information\n");
-      ret = false;
+      return false;
    }
 
-   return ret;
+   if (device->bustype != DRM_BUS_PCI) {
+      drmFreeDevice(&device);
+      log_(_LOADER_DEBUG, "MESA-LOADER: device is not located on the PCI bus\n");
+      return false;
+   }
+
+   *vendor_id = device->deviceinfo.pci->vendor_id;
+   *chip_id = device->deviceinfo.pci->device_id;
+   drmFreeDevice(&device);
+   return true;
 }
 #endif