Introduce intel-gpu-overlay

A realtime display of GPU activity. Note, this is just at the point of
minimum usability...

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 217 insertions, 0 deletions

diff --git a/overlay/igfx.c b/overlay/igfx.c
new file mode 100644
index 00000000..7fdbb51c
--- /dev/null
+++ b/overlay/igfx.c
@@ -0,0 +1,217 @@
+#include <pciaccess.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdio.h>
+
+#include "igfx.h"
+#include "i915_pciids.h"
+
+static const struct igfx_info generic_info = {
+	.gen = -1,
+};
+
+static const struct igfx_info i81x_info = {
+	.gen = 010,
+};
+
+static const struct igfx_info i830_info = {
+	.gen = 020,
+};
+static const struct igfx_info i845_info = {
+	.gen = 020,
+};
+static const struct igfx_info i855_info = {
+	.gen = 021,
+};
+static const struct igfx_info i865_info = {
+	.gen = 022,
+};
+
+static const struct igfx_info i915_info = {
+	.gen = 030,
+};
+static const struct igfx_info i945_info = {
+	.gen = 031,
+};
+
+static const struct igfx_info g33_info = {
+	.gen = 033,
+};
+
+static const struct igfx_info i965_info = {
+	.gen = 040,
+};
+
+static const struct igfx_info g4x_info = {
+	.gen = 045,
+};
+
+static const struct igfx_info ironlake_info = {
+	.gen = 050,
+};
+
+static const struct igfx_info sandybridge_info = {
+	.gen = 060,
+};
+
+static const struct igfx_info ivybridge_info = {
+	.gen = 070,
+};
+
+static const struct igfx_info valleyview_info = {
+	.gen = 071,
+};
+
+static const struct igfx_info haswell_info = {
+	.gen = 075,
+};
+
+static const struct pci_id_match match[] = {
+#if 0
+	INTEL_VGA_DEVICE(PCI_CHIP_I810, &i81x_info),
+	INTEL_VGA_DEVICE(PCI_CHIP_I810_DC100, &i81x_info),
+	INTEL_VGA_DEVICE(PCI_CHIP_I810_E, &i81x_info),
+	INTEL_VGA_DEVICE(PCI_CHIP_I815, &i81x_info),
+#endif
+
+	INTEL_I830_IDS(&i830_info),
+	INTEL_I845G_IDS(&i830_info),
+	INTEL_I85X_IDS(&i855_info),
+	INTEL_I865G_IDS(&i865_info),
+
+	INTEL_I915G_IDS(&i915_info),
+	INTEL_I915GM_IDS(&i915_info),
+	INTEL_I945G_IDS(&i945_info),
+	INTEL_I945GM_IDS(&i945_info),
+
+	INTEL_G33_IDS(&g33_info),
+	INTEL_PINEVIEW_IDS(&g33_info),
+
+	INTEL_I965G_IDS(&i965_info),
+	INTEL_I965GM_IDS(&i965_info),
+
+	INTEL_G45_IDS(&g4x_info),
+	INTEL_GM45_IDS(&g4x_info),
+
+	INTEL_IRONLAKE_D_IDS(&ironlake_info),
+	INTEL_IRONLAKE_M_IDS(&ironlake_info),
+
+	INTEL_SNB_D_IDS(&sandybridge_info),
+	INTEL_SNB_M_IDS(&sandybridge_info),
+
+	INTEL_IVB_D_IDS(&ivybridge_info),
+	INTEL_IVB_M_IDS(&ivybridge_info),
+
+	INTEL_HSW_D_IDS(&haswell_info),
+	INTEL_HSW_M_IDS(&haswell_info),
+
+	INTEL_VLV_D_IDS(&valleyview_info),
+	INTEL_VLV_M_IDS(&valleyview_info),
+
+	INTEL_VGA_DEVICE(PCI_MATCH_ANY, &generic_info),
+
+	{ 0, 0, 0 },
+};
+
+struct pci_device *igfx_get(void)
+{
+	struct pci_device *dev;
+
+	if (pci_system_init())
+		return 0;
+
+	dev = pci_device_find_by_slot(0, 0, 2, 0);
+	if (dev == NULL || dev->vendor_id != 0x8086) {
+		struct pci_device_iterator *iter;
+
+		iter = pci_id_match_iterator_create(match);
+		if (!iter)
+			return 0;
+
+		dev = pci_device_next(iter);
+		pci_iterator_destroy(iter);
+	}
+
+	return dev;
+}
+
+const struct igfx_info *igfx_get_info(struct pci_device *dev)
+{
+	int i;
+
+	if (!dev)
+		return 0;
+
+	for (i = 0; match[i].device_id != PCI_MATCH_ANY; i++)
+		if (dev->device_id == match[i].device_id)
+			return (const struct igfx_info *)match[i].match_data;
+
+	return &generic_info;
+}
+
+static int forcewake = -1;
+
+static void
+igfx_forcewake(void)
+{
+	char buf[1024];
+	const char *path[] = {
+		"/sys/kernel/debug/dri/",
+		"/debug/dri/",
+		0,
+	};
+	int i, j;
+
+	for (j = 0; path[j]; j++) {
+		struct stat st;
+
+		if (stat(path[j], &st))
+			continue;
+
+		for (i = 0; i < 16; i++) {
+			snprintf(buf, sizeof(buf),
+				 "%s/%i/i915_forcewake_user",
+				 path[j], i);
+			forcewake = open(buf, 0);
+			if (forcewake != -1)
+				return;
+		}
+	}
+}
+
+void *igfx_get_mmio(struct pci_device *dev)
+{
+	const struct igfx_info *info;
+	int mmio_bar, mmio_size;
+	void *mmio;
+
+	info = igfx_get_info(dev);
+	if (info->gen >> 3 == 2)
+		mmio_bar = 1;
+	else
+		mmio_bar = 0;
+
+	if (info->gen < 030)
+		mmio_size = 512*1024;
+	else if (info->gen < 050)
+		mmio_size = 512*1024;
+	else
+		mmio_size = 2*1024*1024;
+
+	if (pci_device_probe(dev))
+		return 0;
+
+	if (pci_device_map_range(dev,
+				 dev->regions[mmio_bar].base_addr,
+				 mmio_size,
+				 PCI_DEV_MAP_FLAG_WRITABLE,
+				 &mmio))
+		return 0;
+
+	if (info->gen >= 060)
+		igfx_forcewake();
+
+	return mmio;
+}
+