icd: add an API to scan Linux DRM subsystem

It differs from the scanner in intel ICD in that both legacy (primary) nodes
and render nodes are supported.  And it does not open() any of them.

diff --git a/icd/common/CMakeLists.txt b/icd/common/CMakeLists.txt
index ba49a23..dc6e3bd 100644 (file)
--- a/icd/common/CMakeLists.txt
+++ b/icd/common/CMakeLists.txt
@@ -9,5 +9,5 @@ add_custom_command(OUTPUT icd-dispatch-entrypoints.c
                   DEPENDS ${PROJECT_SOURCE_DIR}/xgl-generate.py
                           ${PROJECT_SOURCE_DIR}/xgl.py)
 
-add_library(icd OBJECT icd.c icd-dispatch-entrypoints.c icd-dispatch-table.h icd-format.c icd-utils.c)
+add_library(icd OBJECT icd.c icd-dispatch-entrypoints.c icd-dispatch-table.h icd-enumerate-drm.c icd-format.c icd-utils.c)
 set_target_properties(icd PROPERTIES POSITION_INDEPENDENT_CODE ON)

diff --git a/icd/common/icd-enumerate-drm.c b/icd/common/icd-enumerate-drm.c
new file mode 100644 (file)
index 0000000..e3ceea8
--- /dev/null
+++ b/icd/common/icd-enumerate-drm.c
@@ -0,0 +1,201 @@
+/*
+ * XGL
+ *
+ * Copyright (C) 2014 LunarG, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *   Chia-I Wu <olv@lunarg.com>
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <libudev.h>
+
+#include "icd-utils.h"
+#include "icd-enumerate-drm.h"
+
+static enum icd_drm_minor_type get_minor_type(struct udev_device *minor_dev)
+{
+    const char *minor;
+
+    minor = udev_device_get_property_value(minor_dev, "MINOR");
+    if (!minor)
+        return ICD_DRM_MINOR_INVALID;
+
+    switch (atoi(minor) >> 6) {
+    case 0:
+        return ICD_DRM_MINOR_LEGACY;
+    case 2:
+        return ICD_DRM_MINOR_RENDER;
+    default:
+        return ICD_DRM_MINOR_INVALID;
+    }
+}
+
+static void get_pci_id(struct udev_device *pci_dev, int *vendor, int *devid)
+{
+    const char *pci_id;
+
+    pci_id = udev_device_get_property_value(pci_dev, "PCI_ID");
+    if (sscanf(pci_id, "%x:%x", vendor, devid) != 2) {
+        *vendor = 0;
+        *devid = 0;
+    }
+}
+
+static struct icd_drm_device *find_dev(struct icd_drm_device *devices,
+                                       const char *parent_syspath)
+{
+    struct icd_drm_device *dev = devices;
+
+    while (dev) {
+        if (!strcmp((const char *) dev->id, parent_syspath))
+            break;
+        dev = dev->next;
+    }
+
+    return dev;
+}
+
+struct icd_drm_device *probe_syspath(struct icd_drm_device *devices,
+                                     struct udev *udev, const char *syspath,
+                                     int vendor_id_match)
+{
+    struct udev_device *minor, *parent;
+    enum icd_drm_minor_type type;
+    const char *parent_syspath;
+    struct icd_drm_device *dev;
+    int vendor, devid;
+
+    minor = udev_device_new_from_syspath(udev, syspath);
+    if (!minor)
+        return devices;
+
+    type = get_minor_type(minor);
+    if (type == ICD_DRM_MINOR_INVALID) {
+        udev_device_unref(minor);
+        return devices;
+    }
+
+    parent = udev_device_get_parent(minor);
+    if (!parent) {
+        udev_device_unref(minor);
+        return devices;
+    }
+
+    get_pci_id(parent, &vendor, &devid);
+    if (vendor_id_match && vendor != vendor_id_match) {
+        udev_device_unref(minor);
+        return devices;
+    }
+
+    parent_syspath = udev_device_get_syspath(parent);
+
+    dev = find_dev(devices, parent_syspath);
+    if (dev) {
+        assert(dev->devid == devid);
+
+        assert(!dev->minors[type]);
+        if (dev->minors[type])
+            udev_device_unref((struct udev_device *) dev->minors[type]);
+
+        dev->minors[type] = (void *) minor;
+
+        return devices;
+    } else {
+        dev = icd_alloc(sizeof(*dev), 0, XGL_SYSTEM_ALLOC_INTERNAL_TEMP);
+        if (!dev)
+            return devices;
+
+        memset(dev, 0, sizeof(*dev));
+
+        dev->id = (const void *) parent_syspath;
+        dev->devid = devid;
+        dev->minors[type] = (void *) minor;
+
+        dev->next = devices;
+
+        return dev;
+    }
+}
+
+struct icd_drm_device *icd_drm_enumerate(int vendor_id)
+{
+    struct icd_drm_device *devices = NULL;
+    struct udev *udev;
+    struct udev_enumerate *e;
+    struct udev_list_entry *entry;
+
+    udev = udev_new();
+    if (udev == NULL) {
+        icd_log(XGL_DBG_MSG_ERROR, XGL_VALIDATION_LEVEL_0,
+                XGL_NULL_HANDLE, 0, 0, "failed to initialize udev context");
+
+        return NULL;
+    }
+
+    e = udev_enumerate_new(udev);
+    if (e == NULL) {
+        icd_log(XGL_DBG_MSG_ERROR, XGL_VALIDATION_LEVEL_0,
+                XGL_NULL_HANDLE, 0, 0,
+                "failed to initialize udev enumerate context");
+        udev_unref(udev);
+
+        return NULL;
+    }
+
+    /* we are interested in DRM minors */
+    udev_enumerate_add_match_subsystem(e, "drm");
+    udev_enumerate_add_match_property(e, "DEVTYPE", "drm_minor");
+    udev_enumerate_scan_devices(e);
+
+    udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
+        devices = probe_syspath(devices, udev,
+                udev_list_entry_get_name(entry), vendor_id);
+    }
+
+    return devices;
+}
+
+void icd_drm_release(struct icd_drm_device *devices)
+{
+    struct icd_drm_device *dev = devices;
+
+    while (dev) {
+        struct icd_drm_device *next = dev->next;
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(dev->minors); i++)
+            udev_device_unref((struct udev_device *) dev->minors[i]);
+
+        icd_free(dev);
+        dev = next;
+    }
+}
+
+const char *icd_drm_get_devnode(struct icd_drm_device *dev,
+                                enum icd_drm_minor_type minor)
+{
+    return (dev->minors[minor]) ?
+        udev_device_get_devnode((struct udev_device *) dev->minors[minor]) :
+        NULL;
+}

diff --git a/icd/common/icd-enumerate-drm.h b/icd/common/icd-enumerate-drm.h
new file mode 100644 (file)
index 0000000..45883f8
--- /dev/null
+++ b/icd/common/icd-enumerate-drm.h
@@ -0,0 +1,54 @@
+/*
+ * XGL
+ *
+ * Copyright (C) 2014 LunarG, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *   Chia-I Wu <olv@lunarg.com>
+ */
+
+#ifndef ICD_ENUMERATE_DRM_H
+#define ICD_ENUMERATE_DRM_H
+
+enum icd_drm_minor_type {
+    ICD_DRM_MINOR_LEGACY,
+    ICD_DRM_MINOR_RENDER,
+
+    ICD_DRM_MINOR_COUNT,
+    ICD_DRM_MINOR_INVALID,
+};
+
+struct icd_drm_device {
+    const void *id;
+    int devid;
+
+    void *minors[ICD_DRM_MINOR_COUNT];
+
+    struct icd_drm_device *next;
+};
+
+struct icd_drm_device *icd_drm_enumerate(int vendor_id);
+void icd_drm_release(struct icd_drm_device *devices);
+
+const char *icd_drm_get_devnode(struct icd_drm_device *dev,
+                                enum icd_drm_minor_type minor);
+
+#endif /* ICD_ENUMERATE_DRM_H */