1 files changed, 137 insertions, 0 deletions
diff --git a/src/app/ring_read.c b/src/app/ring_read.c
new file mode 100644
index 0000000..52206de
--- /dev/null
+++ b/src/app/ring_read.c
@@ -0,0 +1,137 @@
+/*
+ * Copyright 2017 Advanced Micro Devices, 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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: Tom St Denis <tom.stdenis@amd.com>
+ *
+ */
+#include "umrapp.h"
+#include <inttypes.h>
+
+void umr_read_ring(struct umr_asic *asic, char *ringpath)
+{
+	char fname[128], ringname[32], from[32], to[32];
+	int fd, use_decoder, enable_decoder;
+	uint32_t wptr, rptr, drv_wptr, ringsize, start, end, value,
+		 *ring_data;
+	struct umr_ring_decoder decoder, *pdecoder, *ppdecoder;
+
+	memset(ringname, 0, sizeof ringname);
+	memset(from, 0, sizeof from);
+	memset(to, 0, sizeof to);
+	if (sscanf(ringpath, "%[a-z0-9._][%[.0-9]:%[.0-9]]", ringname, from, to) < 1) {
+		printf("Invalid ringpath\n");
+		return;
+	}
+
+	snprintf(fname, sizeof(fname)-1, "/sys/kernel/debug/dri/%d/amdgpu_ring_%s", asic->instance, ringname);
+	fd = open(fname, O_RDWR);
+	if (fd < 0) {
+		perror("Could not open ring debugfs file");
+		return;
+	}
+
+	// only decode PM4 packets on certain rings
+	memset(&decoder, 0, sizeof decoder);
+	if (!memcmp(ringname, "gfx", 3) ||
+	    !memcmp(ringname, "uvd", 3) ||
+	    !memcmp(ringname, "comp", 4)) {
+		enable_decoder = 1;
+		decoder.pm = 4;
+	} else {
+		enable_decoder = 0;
+	}
+
+	/* determine file size */
+	ringsize = lseek(fd, 0, SEEK_END) - 12;
+	lseek(fd, 0, SEEK_SET);
+
+	ring_data = calloc(1, ringsize + 12);
+	if (!ring_data) {
+		close(fd);
+		perror("Could not allocate ring data");
+		return;
+	}
+	read(fd, ring_data, ringsize + 12);
+	close(fd);
+
+	/* read pointers */
+	rptr = ring_data[0]<<2;
+	wptr = ring_data[1]<<2;
+	drv_wptr = ring_data[2]<<2;
+
+	/* default to reading entire ring */
+	if (!from[0]) {
+		start = 0;
+		end   = ringsize;
+	} else {
+		if (from[0] == '.' || !to[0] || to[0] == '.') {
+			/* start from 32 words prior to rptr up to wptr */
+			end = wptr+4;
+			if (rptr < (31*4)) {
+				start = rptr - 31*4;
+				start += ringsize;
+			} else {
+				start = rptr - 31*4;
+			}
+
+		} else {
+			sscanf(from, "%"SCNu32, &start);
+			sscanf(to, "%"SCNu32, &end);
+		}
+	}
+	end %= ringsize;
+	start %= ringsize;
+
+	/* dump data */
+	printf("\n%s.%s.rptr == %lu\n%s.%s.wptr == %lu\n%s.%s.drv_wptr == %lu\n",
+		asic->asicname, ringname, (unsigned long)rptr >> 2,
+		asic->asicname, ringname, (unsigned long)wptr >> 2,
+		asic->asicname, ringname, (unsigned long)drv_wptr >> 2);
+
+	use_decoder = 0;
+	while (start != end) {
+		value = ring_data[(start+12)>>2];
+		printf("%s.%s.ring[%4lu] == 0x%08lx   ", asic->asicname, ringname, (unsigned long)start >> 2, (unsigned long)value);
+		if (enable_decoder && start == rptr && start != wptr) {
+			use_decoder = 1;
+			decoder.pm4.cur_opcode = 0xFFFFFFFF;
+		}
+		printf(" %c%c%c ",
+			(start == rptr) ? 'r' : '.',
+			(start == wptr) ? 'w' : '.',
+			(start == drv_wptr) ? 'D' : '.');
+		if (use_decoder)
+			umr_print_decode(asic, &decoder, value);
+		printf("\n");
+		start += 4;
+		start %= ringsize;
+	}
+	free(ring_data);
+	printf("\n");
+
+	pdecoder = decoder.next_ib;
+	while (pdecoder) {
+		umr_dump_ib(asic, pdecoder);
+		ppdecoder = pdecoder->next_ib;
+		free(pdecoder);
+		pdecoder = ppdecoder;
+	}
+}