[Intel-gfx] [PATCH igt] tools/intel_reg: Add reading and writing registers through engine
Mika Kuoppala
mika.kuoppala at linux.intel.com
Wed Jan 10 13:42:58 UTC 2018
Add option to specify engine for register read/write operation.
If engine is specified, use MI_LOAD_REGISTER_IMM and MI_STORE_REGISTER_IMM
to write and read register using a batch targeted at that engine.
v2: no MI_NOOP after BBE (Chris)
v3: use modern engine names (Chris), use global fd
v4: strcasecmp (Chris)
v5: use register definition format for engine (Jani)
Cc: Jani Nikula <jani.nikula at intel.com>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
CC: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Signed-off-by: Mika Kuoppala <mika.kuoppala at linux.intel.com>
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk> (v4)
---
man/intel_reg.rst | 9 ++-
tools/intel_reg.c | 169 +++++++++++++++++++++++++++++++++++++++++++++++--
tools/intel_reg_spec.h | 1 +
3 files changed, 171 insertions(+), 8 deletions(-)
diff --git a/man/intel_reg.rst b/man/intel_reg.rst
index d1af178a..4ec24c4c 100644
--- a/man/intel_reg.rst
+++ b/man/intel_reg.rst
@@ -103,7 +103,7 @@ Display brief help.
REGISTER REFERENCES
===================
-Registers are defined as [(PORTNAME|PORTNUM|MMIO-OFFSET):](REGNAME|REGADDR).
+Registers are defined as [(PORTNAME|PORTNUM|ENGINE|MMIO-OFFSET):](REGNAME|REGADDR).
PORTNAME
The register access method, most often MMIO, which is the default. The
@@ -120,6 +120,13 @@ PORTNUM
Numbers above 0xff are automatically interpreted as MMIO offsets, not port
numbers.
+ENGINE
+ Instead of cpu based MMIO, specified engine can be used for access method.
+ Batchbuffer will be targeted for the engine to do read/write. The list of
+ available engines is architecture specific and can be found with
+ "intel_reg help". Prefixing engine name with '-' uses non-privileged
+ batchbuffer for access.
+
MMIO-OFFSET
Use MMIO, and add this offset to the register address.
diff --git a/tools/intel_reg.c b/tools/intel_reg.c
index 00d2a4a1..ddff2794 100644
--- a/tools/intel_reg.c
+++ b/tools/intel_reg.c
@@ -33,6 +33,7 @@
#include <unistd.h>
#include "igt.h"
+#include "igt_gt.h"
#include "intel_io.h"
#include "intel_chipset.h"
@@ -73,6 +74,10 @@ struct config {
/* register spec */
char *specfile;
+
+ /* fd for engine access avoiding reopens */
+ int fd;
+
struct reg *regs;
ssize_t regcount;
@@ -236,13 +241,130 @@ static void dump_decode(struct config *config, struct reg *reg, uint32_t val)
}
}
+static const struct intel_execution_engine2 *find_engine(const char *name)
+{
+ const struct intel_execution_engine2 *e;
+
+ if (strlen(name) < 2)
+ return NULL;
+
+ if (name[0] == '-')
+ name++;
+
+ for (e = intel_execution_engines2; e->name; e++) {
+ if (!strcasecmp(e->name, name))
+ return e;
+ }
+
+ return NULL;
+}
+
+static int register_srm(struct config *config, struct reg *reg,
+ uint32_t *val_in)
+{
+ const int gen = intel_gen(config->devid);
+ const bool r64b = gen >= 8;
+ const uint32_t ctx = 0;
+ struct drm_i915_gem_exec_object2 obj[2];
+ struct drm_i915_gem_relocation_entry reloc[1];
+ struct drm_i915_gem_execbuffer2 execbuf;
+ uint32_t *batch, *r;
+ const struct intel_execution_engine2 *engine;
+ bool secure;
+ int fd, i;
+ uint32_t val;
+
+ if (config->fd == -1) {
+ config->fd = __drm_open_driver(DRIVER_INTEL);
+ if (config->fd == -1) {
+ fprintf(stderr, "Error opening driver: %s",
+ strerror(errno));
+ exit(EXIT_FAILURE);
+ }
+ }
+
+ fd = config->fd;
+ engine = find_engine(reg->engine);
+ if (engine == NULL)
+ exit(EXIT_FAILURE);
+
+ secure = reg->engine[0] != '-';
+
+ memset(obj, 0, sizeof(obj));
+ obj[0].handle = gem_create(fd, 4096);
+ obj[1].handle = gem_create(fd, 4096);
+ obj[1].relocs_ptr = to_user_pointer(reloc);
+ obj[1].relocation_count = 1;
+
+ batch = gem_mmap__cpu(fd, obj[1].handle, 0, 4096, PROT_WRITE);
+ gem_set_domain(fd, obj[1].handle,
+ I915_GEM_DOMAIN_CPU, I915_GEM_DOMAIN_CPU);
+
+ i = 0;
+ if (val_in) {
+ batch[i++] = MI_NOOP;
+ batch[i++] = MI_NOOP;
+
+ batch[i++] = MI_LOAD_REGISTER_IMM;
+ batch[i++] = reg->addr;
+ batch[i++] = *val_in;
+ batch[i++] = MI_NOOP;
+ }
+
+ batch[i++] = 0x24 << 23 | (1 + r64b); /* SRM */
+ batch[i++] = reg->addr;
+ reloc[0].target_handle = obj[0].handle;
+ reloc[0].presumed_offset = obj[0].offset;
+ reloc[0].offset = i * sizeof(uint32_t);
+ reloc[0].delta = 0;
+ reloc[0].read_domains = I915_GEM_DOMAIN_RENDER;
+ reloc[0].write_domain = I915_GEM_DOMAIN_RENDER;
+ batch[i++] = reloc[0].delta;
+ if (r64b)
+ batch[i++] = 0;
+
+ batch[i++] = MI_BATCH_BUFFER_END;
+ munmap(batch, 4096);
+
+ memset(&execbuf, 0, sizeof(execbuf));
+ execbuf.buffers_ptr = to_user_pointer(obj);
+ execbuf.buffer_count = 2;
+ execbuf.flags = gem_class_instance_to_eb_flags(fd,
+ engine->class,
+ engine->instance);
+ if (secure)
+ execbuf.flags |= I915_EXEC_SECURE;
+
+ if (config->verbosity > 0)
+ printf("%s: using %sprivileged batch\n",
+ engine->name,
+ secure ? "" : "non-");
+
+ execbuf.rsvd1 = ctx;
+ gem_execbuf(fd, &execbuf);
+ gem_close(fd, obj[1].handle);
+
+ r = gem_mmap__cpu(fd, obj[0].handle, 0, 4096, PROT_READ);
+ gem_set_domain(fd, obj[0].handle, I915_GEM_DOMAIN_CPU, 0);
+
+ val = r[0];
+ munmap(r, 4096);
+
+ gem_close(fd, obj[0].handle);
+
+ return val;
+}
+
static int read_register(struct config *config, struct reg *reg, uint32_t *valp)
{
uint32_t val = 0;
switch (reg->port_desc.port) {
case PORT_MMIO:
- val = INREG(reg->mmio_offset + reg->addr);
+ if (reg->engine)
+ val = register_srm(config, reg, NULL);
+ else
+ val = INREG(reg->mmio_offset + reg->addr);
break;
case PORT_PORTIO_VGA:
iopl(3);
@@ -299,7 +421,11 @@ static int write_register(struct config *config, struct reg *reg, uint32_t val)
switch (reg->port_desc.port) {
case PORT_MMIO:
- OUTREG(reg->mmio_offset + reg->addr, val);
+ if (reg->engine) {
+ register_srm(config, reg, &val);
+ } else {
+ OUTREG(reg->mmio_offset + reg->addr, val);
+ }
break;
case PORT_PORTIO_VGA:
if (val > 0xff) {
@@ -351,7 +477,25 @@ static int write_register(struct config *config, struct reg *reg, uint32_t val)
return ret;
}
-/* s has [(PORTNAME|PORTNUM|MMIO-OFFSET):](REGNAME|REGADDR) */
+static int parse_engine(struct reg *reg, const char *s)
+{
+ const struct intel_execution_engine2 *e;
+
+ e = find_engine(s);
+ if (e) {
+ reg->port_desc.port = PORT_MMIO;
+ reg->port_desc.name = strdup(s);
+ reg->port_desc.stride = 4;
+ reg->engine = strdup(s);
+ reg->mmio_offset = 0;
+ } else {
+ reg->engine = NULL;
+ }
+
+ return reg->engine == NULL;
+}
+
+/* s has [(PORTNAME|PORTNUM|ENGINE|MMIO-OFFSET):](REGNAME|REGADDR) */
static int parse_reg(struct config *config, struct reg *reg, const char *s)
{
unsigned long addr;
@@ -367,7 +511,9 @@ static int parse_reg(struct config *config, struct reg *reg, const char *s)
} else if (p) {
char *port_name = strndup(s, p - s);
- ret = parse_port_desc(reg, port_name);
+ ret = parse_engine(reg, port_name);
+ if (ret)
+ ret = parse_port_desc(reg, port_name);
free(port_name);
p++;
@@ -616,6 +762,7 @@ static const struct command commands[] = {
static int intel_reg_help(struct config *config, int argc, char *argv[])
{
+ const struct intel_execution_engine2 *e;
int i;
printf("Intel graphics register multitool\n\n");
@@ -629,14 +776,18 @@ static int intel_reg_help(struct config *config, int argc, char *argv[])
printf("\n");
printf("REGISTER is defined as:\n");
- printf(" [(PORTNAME|PORTNUM|MMIO-OFFSET):](REGNAME|REGADDR)\n");
+ printf(" [(PORTNAME|PORTNUM|ENGINE|MMIO-OFFSET):](REGNAME|REGADDR)\n");
printf("\n");
printf("PORTNAME is one of:\n");
intel_reg_spec_print_ports();
- printf("\n");
+ printf("\n\n");
+
+ printf("ENGINE is one of:\n");
+ for (e = intel_execution_engines2; e->name; e++)
+ printf("%s -%s ", e->name, e->name);
+ printf("\n\n");
- printf("\n");
printf("OPTIONS common to most COMMANDS:\n");
printf(" --spec=PATH Read register spec from directory or file\n");
printf(" --mmio=FILE Use an MMIO snapshot\n");
@@ -771,6 +922,7 @@ int main(int argc, char *argv[])
const struct command *command = NULL;
struct config config = {
.count = 1,
+ .fd = -1,
};
bool help = false;
@@ -898,5 +1050,8 @@ int main(int argc, char *argv[])
free(config.mmiofile);
+ if (config.fd >= 0)
+ close(config.fd);
+
return ret;
}
diff --git a/tools/intel_reg_spec.h b/tools/intel_reg_spec.h
index dcb31430..c94c61ba 100644
--- a/tools/intel_reg_spec.h
+++ b/tools/intel_reg_spec.h
@@ -53,6 +53,7 @@ struct port_desc {
struct reg {
struct port_desc port_desc;
+ char *engine;
uint32_t mmio_offset;
uint32_t addr;
char *name;
--
2.14.1
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