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c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1752480440; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=8tsfNnFgjFSMarOZ/Ey2DdHtTx77eO4HAyY+2EP63+M=; b=DZ0ekkow+7HjOfPmb8/BVBzz3tc697oR8G/YzCoHvG+wAEO+nCCPKdGUnMRq2JSpP4R4ET bHKL5TWrnvf9PONRJ7RGjoi4iq0NMOR7YKTqYPamRRjvCsUkCksd8KrSW9oW2XbpSDHPZD cIVRLNo1/rvvbTC+jB0n+lSQSkaBvJA= X-MC-Unique: MiVdM-zEPvqhjxtfJrgnIQ-1 X-Mimecast-MFC-AGG-ID: MiVdM-zEPvqhjxtfJrgnIQ_1752480433 From: Eric Auger To: eric.auger.pro@gmail.com, eric.auger@redhat.com, qemu-devel@nongnu.org, qemu-arm@nongnu.org, peter.maydell@linaro.org, imammedo@redhat.com, Jonathan.Cameron@huawei.com, gustavo.romero@linaro.org, anisinha@redhat.com, mst@redhat.com, shannon.zhaosl@gmail.com Cc: pbonzini@redhat.com, philmd@linaro.org, alex.bennee@linaro.org Subject: [PATCH v7 05/36] hw/pci-host/gpex-acpi: Split host bridge OSC and DSM generation Date: Mon, 14 Jul 2025 10:04:49 +0200 Message-ID: <20250714080639.2525563-6-eric.auger@redhat.com> In-Reply-To: <20250714080639.2525563-1-eric.auger@redhat.com> References: <20250714080639.2525563-1-eric.auger@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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charset="utf-8" acpi_dsdt_add_pci_osc() name is confusing as it gives the impression it appends the _OSC method but in fact it also appends the _DSM method for the host bridge. Let's split the function into two separate ones and let them return the method Aml pointer instead. This matches the way it is done on x86 (build_q35_osc_method). In a subsequent patch we will replace the gpex method by the q35 implementation that will become shared between ARM and x86. acpi_dsdt_add_host_bridge_methods is a new top helper that generates both the _OSC and _DSM methods. We take the opportunity to move SUPP and CTRL in the _osc method that use them. Signed-off-by: Eric Auger Reviewed-by: Jonathan Cameron Reviewed-by: Igor Mammedov --- v2 -> v3: - moved aml_append(dev, aml_name_decl("SUPP", aml_int(0))); aml_append(dev, aml_name_decl("CTRL", aml_int(0))); into the _osc function. (Jonathan) hence discarded Gustavo's and Igor's R-bs --- hw/pci-host/gpex-acpi.c | 32 +++++++++++++++++++++----------- 1 file changed, 21 insertions(+), 11 deletions(-) diff --git a/hw/pci-host/gpex-acpi.c b/hw/pci-host/gpex-acpi.c index f34b7cf25e..80fc2bf032 100644 --- a/hw/pci-host/gpex-acpi.c +++ b/hw/pci-host/gpex-acpi.c @@ -50,14 +50,12 @@ static void acpi_dsdt_add_pci_route_table(Aml *dev, uin= t32_t irq, } } =20 -static void acpi_dsdt_add_pci_osc(Aml *dev, bool enable_native_pcie_hotplu= g) +static Aml *build_host_bridge_osc(bool enable_native_pcie_hotplug) { - Aml *method, *UUID, *ifctx, *ifctx1, *elsectx, *buf; - - /* Declare an _OSC (OS Control Handoff) method */ - aml_append(dev, aml_name_decl("SUPP", aml_int(0))); - aml_append(dev, aml_name_decl("CTRL", aml_int(0))); + Aml *method, *UUID, *ifctx, *ifctx1, *elsectx; method =3D aml_method("_OSC", 4, AML_NOTSERIALIZED); + aml_append(method, aml_name_decl("SUPP", aml_int(0))); + aml_append(method, aml_name_decl("CTRL", aml_int(0))); aml_append(method, aml_create_dword_field(aml_arg(3), aml_int(0), "CDW1")); =20 @@ -103,9 +101,13 @@ static void acpi_dsdt_add_pci_osc(Aml *dev, bool enabl= e_native_pcie_hotplug) aml_name("CDW1"))); aml_append(elsectx, aml_return(aml_arg(3))); aml_append(method, elsectx); - aml_append(dev, method); + return method; +} =20 - method =3D aml_method("_DSM", 4, AML_NOTSERIALIZED); +static Aml *build_host_bridge_dsm(void) +{ + Aml *method =3D aml_method("_DSM", 4, AML_NOTSERIALIZED); + Aml *UUID, *ifctx, *ifctx1, *buf; =20 /* PCI Firmware Specification 3.0 * 4.6.1. _DSM for PCI Express Slot Information @@ -124,7 +126,15 @@ static void acpi_dsdt_add_pci_osc(Aml *dev, bool enabl= e_native_pcie_hotplug) byte_list[0] =3D 0; buf =3D aml_buffer(1, byte_list); aml_append(method, aml_return(buf)); - aml_append(dev, method); + return method; +} + +static void acpi_dsdt_add_host_bridge_methods(Aml *dev, + bool enable_native_pcie_hotp= lug) +{ + /* Declare an _OSC (OS Control Handoff) method */ + aml_append(dev, build_host_bridge_osc(enable_native_pcie_hotplug)); + aml_append(dev, build_host_bridge_dsm()); } =20 void acpi_dsdt_add_gpex(Aml *scope, struct GPEXConfig *cfg) @@ -193,7 +203,7 @@ void acpi_dsdt_add_gpex(Aml *scope, struct GPEXConfig *= cfg) if (is_cxl) { build_cxl_osc_method(dev); } else { - acpi_dsdt_add_pci_osc(dev, true); + acpi_dsdt_add_host_bridge_methods(dev, true); } =20 aml_append(scope, dev); @@ -268,7 +278,7 @@ void acpi_dsdt_add_gpex(Aml *scope, struct GPEXConfig *= cfg) } aml_append(dev, aml_name_decl("_CRS", rbuf)); =20 - acpi_dsdt_add_pci_osc(dev, true); + acpi_dsdt_add_host_bridge_methods(dev, true); =20 Aml *dev_res0 =3D aml_device("%s", "RES0"); aml_append(dev_res0, aml_name_decl("_HID", aml_string("PNP0C02"))); --=20 2.49.0