Mesa (main): util/tc: add a util function for setting bytes_mapped_limit

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Module: Mesa
Branch: main
Commit: 671d579b46d79905a4daa2e3e59ee0d29a95708e
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=671d579b46d79905a4daa2e3e59ee0d29a95708e

Author: Mike Blumenkrantz <michael.blumenkrantz at gmail.com>
Date:   Wed Jul 14 13:43:13 2021 -0400

util/tc: add a util function for setting bytes_mapped_limit

tc drivers set this based on os_get_total_physical_memory()/divisor,
which is going to be totally wrong for 32bit processes and explode
the address space

this util function can be used to handle per-platform clamping

Reviewed-by: Marek Olšák <marek.olsak at amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11853>

---

 src/gallium/auxiliary/util/u_threaded_context.c | 11 +++++++++++
 src/gallium/auxiliary/util/u_threaded_context.h |  3 +++
 2 files changed, 14 insertions(+)

diff --git a/src/gallium/auxiliary/util/u_threaded_context.c b/src/gallium/auxiliary/util/u_threaded_context.c
index 543662f0429..8e9898310ab 100644
--- a/src/gallium/auxiliary/util/u_threaded_context.c
+++ b/src/gallium/auxiliary/util/u_threaded_context.c
@@ -4207,3 +4207,14 @@ fail:
    tc_destroy(&tc->base);
    return NULL;
 }
+
+void
+threaded_context_init_bytes_mapped_limit(struct threaded_context *tc, unsigned divisor)
+{
+   uint64_t total_ram;
+   if (os_get_total_physical_memory(&total_ram)) {
+      tc->bytes_mapped_limit = total_ram / divisor;
+      if (sizeof(void*) == 4)
+         tc->bytes_mapped_limit = MIN2(tc->bytes_mapped_limit, 512*1024*1024UL);
+   }
+}
diff --git a/src/gallium/auxiliary/util/u_threaded_context.h b/src/gallium/auxiliary/util/u_threaded_context.h
index 952429d74ff..04088166248 100644
--- a/src/gallium/auxiliary/util/u_threaded_context.h
+++ b/src/gallium/auxiliary/util/u_threaded_context.h
@@ -504,6 +504,9 @@ threaded_context_create(struct pipe_context *pipe,
                         bool driver_calls_flush_notify,
                         struct threaded_context **out);
 
+void
+threaded_context_init_bytes_mapped_limit(struct threaded_context *tc, unsigned divisor);
+
 void
 threaded_context_flush(struct pipe_context *_pipe,
                        struct tc_unflushed_batch_token *token,