[igt-dev] [PATCH i-g-t 1/3] i915/gem_mmio_base.c - get mmio_base from debugfs (if possible)
Petri Latvala
petri.latvala at intel.com
Tue Feb 11 09:22:00 UTC 2020
On Mon, Feb 10, 2020 at 04:46:11PM -0800, Dale B Stimson wrote:
> Signed-off-by: Dale B Stimson <dale.b.stimson at intel.com>
> ---
> lib/Makefile.sources | 2 +
> lib/i915/gem_mmio_base.c | 346 +++++++++++++++++++++++++++++++++++++++
> lib/i915/gem_mmio_base.h | 19 +++
> lib/igt.h | 1 +
> lib/meson.build | 1 +
> 5 files changed, 369 insertions(+)
> create mode 100644 lib/i915/gem_mmio_base.c
> create mode 100644 lib/i915/gem_mmio_base.h
>
> diff --git a/lib/Makefile.sources b/lib/Makefile.sources
> index 3e573f267..4c5d50d5d 100644
> --- a/lib/Makefile.sources
> +++ b/lib/Makefile.sources
> @@ -7,6 +7,8 @@ lib_source_list = \
> i915/gem_context.h \
> i915/gem_engine_topology.c \
> i915/gem_engine_topology.h \
> + i915/gem_mmio_base.c \
> + i915/gem_mmio_base.h \
> i915/gem_scheduler.c \
> i915/gem_scheduler.h \
> i915/gem_submission.c \
> diff --git a/lib/i915/gem_mmio_base.c b/lib/i915/gem_mmio_base.c
> new file mode 100644
> index 000000000..8718c092f
> --- /dev/null
> +++ b/lib/i915/gem_mmio_base.c
> @@ -0,0 +1,346 @@
> +// Copyright (C) 2020 Intel Corporation
> +//
> +// SPDX-License-Identifier: MIT
We don't use SPDX headers in IGT, please use the MIT license comment
block instead.
--
Petri Latvala
> +
> +#include <ctype.h>
> +
> +#include <fcntl.h>
> +
> +#include "igt.h"
> +
> +struct eng_mmio_base_s {
> + char name[8];
> + uint32_t mmio_base;
> +};
> +
> +struct eng_mmio_base_table_s {
> + unsigned int mb_cnt;
> + struct eng_mmio_base_s mb_tab[GEM_MAX_ENGINES];
> +};
> +
> +
> +static struct eng_mmio_base_table_s *_gem_engine_mmio_info_dup(
> + const struct eng_mmio_base_table_s *mbpi)
> +{
> + struct eng_mmio_base_table_s *mbpo;
> + size_t nbytes;
> +
> + nbytes = offsetof(typeof(struct eng_mmio_base_table_s), mb_tab[mbpi->mb_cnt]);
> + mbpo = malloc(nbytes);
> + igt_assert(mbpo);
> + memcpy(mbpo, mbpi, nbytes);
> +
> + return mbpo;
> +}
> +
> +void gem_engine_mmio_base_info_free(struct eng_mmio_base_table_s *mbp)
> +{
> + free(mbp);
> +}
> +
> +static void _gem_engine_mmio_info_legacy_add(struct eng_mmio_base_table_s *mbp,
> + const char *eng_name, uint32_t mmio_base)
> +{
> + if (mmio_base) {
> + strncpy(mbp->mb_tab[mbp->mb_cnt].name, eng_name,
> + sizeof(mbp->mb_tab[0].name));
> + mbp->mb_tab[mbp->mb_cnt].mmio_base = mmio_base;
> + mbp->mb_cnt++;
> + }
> +}
> +
> +/**
> + * _gem_engine_mmio_base_info_get_legacy:
> + * @fd_dev: file descriptor upon which device is open or -1 to use defaults.
> + *
> + * Provides per-engine mmio_base information from legacy built-in values
> + * for the case when the information is not otherwise available.
> + *
> + * Returns:
> + * Pointer to dynamically allocated struct eng_mmio_base_table_s describing
> + * engine config or NULL.
> + * The allocated size does not include unused engine entries.
> + * If non-NULL, it is caller's responsibility to free.
> + */
> +static struct eng_mmio_base_table_s *_gem_engine_mmio_base_info_get_legacy(int fd_dev)
> +{
> + int gen;
> + uint32_t mmio_base;
> + struct eng_mmio_base_table_s mbt;
> + struct eng_mmio_base_table_s *mbp;
> +
> + memset(&mbt, 0, sizeof(mbt));
> +
> + gen = intel_gen(intel_get_drm_devid(fd_dev));
> +
> + /* The mmio_base values for engine instances 1 and higher cannot
> + * be reliability determinated a priori. */
> +
> + _gem_engine_mmio_info_legacy_add(&mbt, "rcs0", 0x2000);
> + _gem_engine_mmio_info_legacy_add(&mbt, "bcs0", 0x22000);
> +
> + if (gen < 6)
> + mmio_base = 0x4000;
> + else if (gen < 11)
> + mmio_base = 0x12000;
> + else
> + mmio_base = 0x1c0000;
> + _gem_engine_mmio_info_legacy_add(&mbt, "vcs0", mmio_base);
> +
> + if (gen < 11)
> + mmio_base = 0x1a000;
> + else
> + mmio_base = 0x1c8000;
> + _gem_engine_mmio_info_legacy_add(&mbt, "vecs0", mmio_base);
> +
> + if (mbt.mb_cnt <= 0)
> + return NULL;
> +
> + mbp = _gem_engine_mmio_info_dup(&mbt);
> +
> + return mbp;
> +}
> +
> +
> +/**
> + * _gem_engine_mmio_base_info_get_debugfs:
> + * @fd_dev: file descriptor upon which device is open or -1 to use defaults.
> + *
> + * Obtains per-engine mmio_base information from debugfs.
> + *
> + * Returns:
> + * Pointer to dynamically allocated struct eng_mmio_base_table_s describing
> + * engine config or NULL.
> + * The allocated size does not include unused engine entries.
> + * If non-NULL, it is caller's responsibility to free.
> + *
> + * Looking in debugfs for per-engine instances of:
> + * <engine_name>
> + * ...
> + * MMIO base: <u32_hex_number>
> + *
> + * Example of relevant lines from debugfs:
> + * vcs0
> + * MMIO base: 0x001c0000
> + * vcs1
> + * MMIO base: 0x001d0000
> + *
> + * In order to qualify as the introduction of a new per-engine section, an
> + * input line must consist solely of an engine name. An engine name must
> + * be 7 or fewer characters in length and must consist of an engine class
> + * name of 3 or more lower case characters followed by an instance number.
> + */
> +static struct eng_mmio_base_table_s *_gem_engine_mmio_base_info_get_debugfs(int fd_dev)
> +{
> + static const char pth_ei[] = "i915_engine_info";
> + static const char str_mmio_base[] = "MMIO base:";
> + const size_t len_mmio_base = sizeof(str_mmio_base) - 1;
> + FILE *fpi;
> + char line_buf[128];
> + char *plne;
> + char *p_name;
> + char *pbeg;
> + size_t line_len;
> + struct eng_mmio_base_table_s mbt;
> + struct eng_mmio_base_table_s *mbp;
> + const size_t name_max = sizeof(mbt.mb_tab[0].name);
> + int ec;
> + int eng_found;
> + int nc;
> + int fd_ei;
> + int eof_seen;
> +
> + fd_ei = igt_debugfs_open(fd_dev, pth_ei, O_RDONLY);
> + if (fd_ei < 0)
> + return NULL;
> +
> + fpi = fdopen(fd_ei, "r");
> + if (!fpi) {
> + if (errno != ENOENT) {
> + igt_warn("open failed: %s: %s\n", pth_ei,
> + strerror(errno));
> + }
> + return NULL;
> + }
> +
> + memset(&mbt, 0, sizeof(mbt));
> +
> + ec = 0;
> + eng_found = 0;
> + eof_seen = 0;
> + while (!eof_seen) {
> + plne = fgets(line_buf, sizeof(line_buf), fpi);
> + if (!plne) {
> + eof_seen = 1;
> + plne = line_buf;
> + plne[0] = '\0';
> + }
> +
> + if (plne[0]) {
> + /* Ignore lines that exceed allowed length. */
> + line_len = strlen(plne);
> + if (plne[line_len-1] != '\n') {
> + for (;;) {
> + plne = fgets(line_buf,
> + sizeof(line_buf), fpi);
> + if (!plne)
> + break;
> + line_len = strlen(plne);
> + if (plne[line_len-1] == '\n')
> + break;
> + }
> + continue;
> + }
> + plne[line_len-1] = '\0';
> +
> + p_name = NULL;
> + nc = 0;
> + do {
> + for (; nc < name_max; nc++) {
> + if (!islower(plne[nc]))
> + break;
> + }
> + if (nc < 3)
> + break;
> + if (!isdigit(plne[nc]))
> + break;
> + for (; nc < name_max; nc++) {
> + if (!isdigit(plne[nc]))
> + break;
> + }
> + if ((nc >= name_max) || plne[nc])
> + break;
> + p_name = plne;
> + } while (0);
> + }
> +
> + if (eof_seen || p_name) {
> + if (eng_found) {
> + eng_found = 0;
> + if ((ec + 1) >= GEM_MAX_ENGINES)
> + continue;
> + ec++;
> + }
> + }
> +
> + if (p_name) {
> + strncpy(mbt.mb_tab[ec].name, p_name, nc);
> + eng_found = 1;
> + continue;
> + }
> +
> + if (eng_found) {
> + pbeg = plne;
> + while (isspace(pbeg[0]))
> + pbeg++;
> + if (strncmp(pbeg, str_mmio_base, len_mmio_base) == 0) {
> + unsigned long int ulv;
> + uint32_t uiv;
> + char *ep;
> +
> + pbeg += len_mmio_base;
> + ulv = strtoul(pbeg, &ep, 16);
> +
> + uiv = (uint32_t) ulv;
> + igt_assert_f(((pbeg != ep) && (ulv == uiv)),
> + "invalid number: %s\n", plne);
> +
> + while (isspace(*ep))
> + ep++;
> + igt_assert_f((!*ep),
> + "junk follows number: \"%s\"\n", plne);
> +
> + mbt.mb_tab[ec].mmio_base = uiv;
> + }
> + }
> + }
> +
> + if (fpi)
> + fclose(fpi);
> +
> + mbt.mb_cnt = ec;
> +
> + if (mbt.mb_cnt <= 0)
> + return NULL;
> +
> + mbp = _gem_engine_mmio_info_dup(&mbt);
> +
> + return mbp;
> +}
> +
> +/**
> + * gem_engine_mmio_base_info_get:
> + * @fd_dev: file descriptor upon which device is open or -1 to use defaults.
> + *
> + * Obtains per-engine mmio_base information. Multiple sub-functions will
> + * be tried in order of preference.
> + *
> + * Returns:
> + * Pointer to dynamically allocated struct eng_mmio_base_table_s describing
> + * engine config or NULL.
> + * The allocated size does not include unused engine entries.
> + * If non-NULL, it is caller's responsibility to free.
> + */
> +struct eng_mmio_base_table_s *gem_engine_mmio_base_info_get(int fd_dev)
> +{
> + struct eng_mmio_base_table_s *mbp = NULL;
> +
> + /* If and when better ways are provided to find the mmio_base
> + * information, they may be added them here in order of preference.
> + */
> +
> +#if 0
> + if (!mbp)
> + mbp = _mmio_base_info_get_via_sysfs(fd_dev);
> +#endif
> +
> + if (!mbp)
> + mbp = _gem_engine_mmio_base_info_get_debugfs(fd_dev);
> +
> + if (!mbp)
> + mbp = _gem_engine_mmio_base_info_get_legacy(fd_dev);
> +
> + if (!mbp)
> + igt_warn("Per-engine mmio_base data is not present\n");
> +
> + return mbp;
> +}
> +
> +/**
> + * gem_engine_mmio_base_info_dump:
> + *
> + * Dumps engine mmio_base data.
> + *
> + * Returns: void
> + */
> +void gem_engine_mmio_base_info_dump(const struct eng_mmio_base_table_s *mbp)
> +{
> + int ix;
> + const struct eng_mmio_base_s *e_mb;
> +
> + fprintf(stdout, "engine names and mmio_base addresses:\n");
> +
> + for (ix = 0; ix < mbp->mb_cnt; ix++) {
> + e_mb = mbp->mb_tab + ix;
> + if (e_mb->mmio_base) {
> + fprintf(stdout, "%-8s 0x%8.8x\n",
> + e_mb->name, e_mb->mmio_base);
> + }
> + }
> +}
> +
> +uint32_t gem_engine_mmio_base(const struct eng_mmio_base_table_s *mbp,
> + const char *eng_name)
> +{
> + int ix;
> + const struct eng_mmio_base_s *e_mb;
> +
> + for (ix = 0; ix < mbp->mb_cnt; ix++) {
> + e_mb = mbp->mb_tab + ix;
> + if (e_mb->mmio_base && !strcmp(eng_name, e_mb->name)) {
> + return e_mb->mmio_base;
> + }
> + }
> +
> + return 0;
> +}
> diff --git a/lib/i915/gem_mmio_base.h b/lib/i915/gem_mmio_base.h
> new file mode 100644
> index 000000000..1e138690f
> --- /dev/null
> +++ b/lib/i915/gem_mmio_base.h
> @@ -0,0 +1,19 @@
> +// Copyright (C) 2020 Intel Corporation
> +//
> +// SPDX-License-Identifier: MIT
> +
> +#ifndef GEM_MMIO_BASE_H
> +#define GEM_MMIO_BASE_H
> +
> +struct eng_mmio_base_table_s;
> +
> +struct eng_mmio_base_table_s *gem_engine_mmio_base_info_get(int fd_dev);
> +
> +void gem_engine_mmio_base_info_free(struct eng_mmio_base_table_s *mbp);
> +
> +void gem_engine_mmio_base_info_dump(const struct eng_mmio_base_table_s *mbp);
> +
> +uint32_t gem_engine_mmio_base(const struct eng_mmio_base_table_s *mbp,
> + const char *eng_name);
> +
> +#endif /* GEM_MMIO_BASE_H */
> diff --git a/lib/igt.h b/lib/igt.h
> index a6c4e44d2..8e70dcb02 100644
> --- a/lib/igt.h
> +++ b/lib/igt.h
> @@ -55,5 +55,6 @@
> #include "rendercopy.h"
> #include "i915/gem_mman.h"
> #include "i915/gem_engine_topology.h"
> +#include "i915/gem_mmio_base.h"
>
> #endif /* IGT_H */
> diff --git a/lib/meson.build b/lib/meson.build
> index e87e58036..def72c2bd 100644
> --- a/lib/meson.build
> +++ b/lib/meson.build
> @@ -2,6 +2,7 @@ lib_sources = [
> 'drmtest.c',
> 'i915/gem_context.c',
> 'i915/gem_engine_topology.c',
> + 'i915/gem_mmio_base.c',
> 'i915/gem_scheduler.c',
> 'i915/gem_submission.c',
> 'i915/gem_ring.c',
> --
> 2.25.0
>
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