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ldls: L4 was free after all, and the plan closes

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L4 was listed as "free -- H2 built all of this" and never actually tested,
which is a claim rather than a result. Tested now, and it holds:

    ldlsd running     ping 2/2; holds index 7 and DMA slots 3 and 4
    killed            interface DOWN, device released, bus mastering
                      cleared, DMA reclaimed -- back to vgpud's 3 blocks
    ping              fails honestly: sendto: -5
    a second ldlsd    ping 3/3, and the arena hands back the same addresses

pciuser_release_all() and netuser_release_all() sit beside each other in
exit() for the same reason, and that they apply unchanged to a foreign driver
is the whole point of having built them against our own.

With that, every milestone on ldls.md is done, so it leaves docs/plan/ for
docs/architecture/ -- the rule docs/plan/README.md states and the one that
keeps the two directories meaning different things. The new document describes
what is, not what was planned: the five rules, the four pieces, what it costs
(polling, no stack protector, locks that are no-ops), that it can be killed,
and a "what it does not do" that leads with one driver, one kernel version,
tried once.

Sixteen source files pointed at docs/plan/ldls.md and would have been dangling
the moment it moved. All repointed, and the milestone references -- which the
architecture doc deliberately does not have -- rewritten to name sections
instead, so a reader lands somewhere real.

The register row closes with it. hybrid.md freed a slot, ldls.md took it, and
it is now free again.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VQ7Qx8E1q1M1bbCq8QLHS2
This commit is contained in:
Nexoniarz 2026-09-14 13:37:04 +02:00
commit f38eb8a7fd
22 changed files with 278 additions and 929 deletions
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6
ldls/host/run.c
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@ -2,7 +2,7 @@
//
// ldls-run -- load a module and call its init, on the build machine.
//
// docs/plan/ldls.md milestone L1. L0 answered "what does this driver ask
// docs/architecture/ldls.md. The loader answered "what does this driver ask
// for"; this answers "and in what order does it ask", which is the other thing
// that cannot be guessed and falls straight out of running the thing.
//
@ -18,7 +18,7 @@
// that logs and returns zero, so a driver gets as far as its first real
// dependency on the kernel doing something, and then says so.
//
// **No module is committed to this tree.** See docs/plan/ldls.md rule 1.
// **No module is committed to this tree.** See docs/architecture/ldls.md rule 1.
#include <stdio.h>
#include <stdlib.h>
@ -264,7 +264,7 @@ wr64(unsigned long base, unsigned int off, unsigned long v)
// The PCI resource flag bits. These are not layout and BTF does not carry
// them -- they are #defines. They are ABI between the kernel and every driver
// ever written against it, which makes them facts in the sense of
// docs/plan/ldls.md rule 3, and there are two of them.
// docs/architecture/ldls.md rule 3, and there are two of them.
#define LDLS_IORESOURCE_IO 0x00000100
#define LDLS_IORESOURCE_MEM 0x00000200