Date: Mon, 15 Dec 2025 18:18:44 +0000 From: Jessica Clarke <jrtc27@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: d00f1d6858a0 - stable/13 - gic_v3: Correctly handle GICC GIGR Base Address case Message-ID: <69405104.257f9.7de14132@gitrepo.freebsd.org>
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The branch stable/13 has been updated by jrtc27: URL: https://cgit.FreeBSD.org/src/commit/?id=d00f1d6858a0caca5c52f819da8381a6be11e3a9 commit d00f1d6858a0caca5c52f819da8381a6be11e3a9 Author: Jessica Clarke <jrtc27@FreeBSD.org> AuthorDate: 2024-12-09 21:55:06 +0000 Commit: Jessica Clarke <jrtc27@FreeBSD.org> CommitDate: 2025-12-15 17:56:36 +0000 gic_v3: Correctly handle GICC GIGR Base Address case When using the GICR Base Address field from each GICC structure instead of GICR structures, the field gives the address of a single redistributor page. However, that does not mean that they are not contiguous, and so GICR_TYPER.Last could be clear on them. Thus we must ignore GICR_TYPER.Last in this case and always treat each region as having a single page. Normally we'd do that as a result of checking against the rman's size (though that's a rather roundabout and iffy way of achieving it), but for whatever reason this is bigger on the Qualcomm Snapdragon X Elite (I assume the MADT reports GICv4 but TYPER doesn't report VLPIS and so there is a mismatch between the rman size and the stride used) and we end up walking off the region's mapping. Reviewed by: andrew, phk MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D47560 (cherry picked from commit f8c90b704189c94275d22d7cc204d1d74e821d86) --- sys/arm64/arm64/gic_v3.c | 3 ++- sys/arm64/arm64/gic_v3_acpi.c | 1 + sys/arm64/arm64/gic_v3_var.h | 6 ++++++ 3 files changed, 9 insertions(+), 1 deletion(-) diff --git a/sys/arm64/arm64/gic_v3.c b/sys/arm64/arm64/gic_v3.c index c90edc3ba14c..5e77d2670217 100644 --- a/sys/arm64/arm64/gic_v3.c +++ b/sys/arm64/arm64/gic_v3.c @@ -1315,7 +1315,8 @@ gic_v3_redist_find(struct gic_v3_softc *sc) } rman_set_bushandle(&r_res, r_bsh); - } while ((typer & GICR_TYPER_LAST) == 0); + } while (!sc->gic_redists.single && + (typer & GICR_TYPER_LAST) == 0); } device_printf(sc->dev, "No Re-Distributor found for CPU%u\n", cpuid); diff --git a/sys/arm64/arm64/gic_v3_acpi.c b/sys/arm64/arm64/gic_v3_acpi.c index 45e5578ee647..287c8c2d99eb 100644 --- a/sys/arm64/arm64/gic_v3_acpi.c +++ b/sys/arm64/arm64/gic_v3_acpi.c @@ -290,6 +290,7 @@ gic_v3_acpi_count_regions(device_t dev) acpi_walk_subtables(madt + 1, (char *)madt + madt->Header.Length, madt_count_gicc_redistrib, sc); + sc->gic_redists.single = true; } acpi_unmap_table(madt); diff --git a/sys/arm64/arm64/gic_v3_var.h b/sys/arm64/arm64/gic_v3_var.h index 1a4112a4b0ea..c5ca77a46811 100644 --- a/sys/arm64/arm64/gic_v3_var.h +++ b/sys/arm64/arm64/gic_v3_var.h @@ -52,6 +52,12 @@ struct gic_redists { struct resource ** regions; /* Number of Re-Distributor regions */ u_int nregions; + /* + * Whether to treat each region as a single Re-Distributor page or a + * series of contiguous pages (i.e. from each ACPI MADT GICC's GICR + * Base Address field) + */ + bool single; /* Per-CPU Re-Distributor data */ struct redist_pcpu *pcpu[MAXCPU]; };help
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