intel_gtt: Raw PTE dumper mode

./tools/intel_gtt -d | head
GTT offset |                 PTEs
--------------------------------------------------------
  0x000000 | 0xe4005015 0xe2854015 0xe283e015 0xe283f015
  0x004000 | 0xe28ba015 0xe28bb015 0xe28b6015 0xe28b7015
  0x008000 | 0xe2828015 0xe2829015 0xe282a015 0xe282b015
  0x00c000 | 0xe2928015 0xe2929015 0xe292a015 0xe292b015
  0x010000 | 0xe2918015 0xe2919015 0xe291a015 0xe291b015
  0x014000 | 0xe291c015 0xe291d015 0xe291e015 0xe291f015
  0x018000 | 0xe2920015 0xe2921015 0xe2922015 0xe2923015
  0x01c000 | 0xe2924015 0xe2925015 0xe2926015 0xe2927015

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>

diff --git a/tools/intel_gtt.c b/tools/intel_gtt.c
index d13e29d..1f1b882 100644 (file)
--- a/tools/intel_gtt.c
+++ b/tools/intel_gtt.c
@@ -71,6 +71,25 @@ static uint64_t get_phys(uint32_t pt_offset)
        return (phys | pae) & ~0xfff;
 }
 
+static void pte_dump(int size, uint32_t offset) {
+       int start;
+       /* Want to print 4 ptes at a time (4b PTE assumed). */
+       if (size % 16)
+               size = (size + 16) & ~0xffff;
+
+
+       printf("GTT offset |                 PTEs\n");
+       printf("--------------------------------------------------------\n");
+       for (start = 0; start < size; start += KB(16)) {
+               printf("  0x%06x | 0x%08x 0x%08x 0x%08x 0x%08x\n",
+                               start,
+                               INGTT(start + 0x0),
+                               INGTT(start + 0x1000),
+                               INGTT(start + 0x2000),
+                               INGTT(start + 0x3000));
+       }
+}
+
 int main(int argc, char **argv)
 {
        struct pci_device *pci_dev;
@@ -118,6 +137,10 @@ int main(int argc, char **argv)
        }
 
        aper_size = pci_dev->regions[2].size;
+       if (argc > 1 && !strncmp("-d", argv[1], 2)) {
+               pte_dump(aper_size, 0);
+               return 0;
+       }
 
        for (start = 0; start < aper_size; start += KB(4)) {
                uint64_t start_phys = get_phys(start);