From nobody Mon Oct 6 22:52:29 2025 Received: from m16.mail.163.com (m16.mail.163.com [117.135.210.2]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 439B62F5466; Wed, 16 Jul 2025 16:12:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=117.135.210.2 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752682358; cv=none; b=W2fC3HtAw/M0QrtVJ2xP8ZDmOuqELym7ThsdlxZW8Sovnt+TqV+I2EV1bFmBoMCZgXOIu5NRfhh6l30BRa0mJUbOhQB7TYJ9uMQGnGKm0WttfsX/iLF4kh5HiN16ZX+H+zGWeIvAm8YS+tXwVEgWSdzP21OMDTQXRDw4wzgWLsk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752682358; c=relaxed/simple; bh=5QRhjTY61OamMuKmyL25IGxdeBzFuqBgtEG2oUdBnEo=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=EHXX9T3vakrjG/sgEhCwWO6g179r3PVghl9IW/Tel6C+HIfa/VdXDK1886AzFuzD2HQNcAlWGy7aYOuI7jktP1SgYDgo61tHRuMNHItlQr/Xk7aoOq5r+Rjge7sK3koyqkCbR+Pad6tzG2oJMs9DwMifSD5ti6WCgK/Pa5/u0kA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com; spf=pass smtp.mailfrom=163.com; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b=eoKMaiHn; arc=none smtp.client-ip=117.135.210.2 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=163.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b="eoKMaiHn" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=t7 nhK9QibaYlqN4aFk40gKliWnYXZDrUuUsAUWHP5PM=; b=eoKMaiHnFmjpqXdyNx phuJNs93GBgimMXcWWqm3EmCg8e8UztD1AsL3EtQezEtKen71gkGyBFbji7rvGLP /eq1lxBZ0z57Vv23/ppFEvRM27svIsZJKxnwfO5xiYfQbXsNVj2If+ENDnZHZaGv r9T9xt5s7mXLcSQkrWfdJsD+U= Received: from localhost.localdomain (unknown []) by gzsmtp3 (Coremail) with SMTP id PigvCgAnMkhWz3doF6jWAw--.24466S7; Thu, 17 Jul 2025 00:12:12 +0800 (CST) From: Hans Zhang <18255117159@163.com> To: lpieralisi@kernel.org, kwilczynski@kernel.org, bhelgaas@google.com, helgaas@kernel.org, jingoohan1@gmail.com, mani@kernel.org Cc: robh@kernel.org, ilpo.jarvinen@linux.intel.com, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Hans Zhang <18255117159@163.com> Subject: [PATCH v14 5/7] PCI: dwc: Use common PCI host bridge APIs for finding the capabilities Date: Thu, 17 Jul 2025 00:12:01 +0800 Message-Id: <20250716161203.83823-6-18255117159@163.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20250716161203.83823-1-18255117159@163.com> References: <20250716161203.83823-1-18255117159@163.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: PigvCgAnMkhWz3doF6jWAw--.24466S7 X-Coremail-Antispam: 1Uf129KBjvJXoWxuryrCr4UAF1ruw1kCw1DAwb_yoWrZFWUp3 yrAwn0yF4UAr1aqw1DZFnIv3W3AF9xAF1xAa97Gwnavry2kryUJ340krWagrnakrZFgFya gr4kJFyrArnxtFDanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x0pEwvtiUUUUU= X-CM-SenderInfo: rpryjkyvrrlimvzbiqqrwthudrp/1tbiWwKMo2h3yadzGQAAst Content-Type: text/plain; charset="utf-8" Use the PCI core is now exposing generic macros for the host bridges to search for the PCIe capabilities, make use of them in the DWC driver. Signed-off-by: Hans Zhang <18255117159@163.com> Acked-by: Manivannan Sadhasivam --- Changes since v13: - Use simplified macro definitions: PCI_FIND_NEXT_CAP(), PCI_FIND_NEXT_EXT_= CAP(). Changes since v12: - Modify the function's return value and format issues. Changes since v11: - Resolve compilation errors. s/dw_pcie_read_dbi/dw_pcie_read*_dbi Changes since v10: - None Changes since v9: - Resolved [v9 4/6] compilation error. The latest 6.15 rc1 merge __dw_pcie_find_vsec_capability, which uses=20 dw_pcie_find_next_ext_capability. Changes since v8: - None Changes since v7: - Resolve compilation errors. Changes since v6: https://lore.kernel.org/linux-pci/20250323164852.430546-3-18255117159@163.c= om/ - The patch commit message were modified. Changes since v5: https://lore.kernel.org/linux-pci/20250321163803.391056-3-18255117159@163.c= om/ - Kconfig add "select PCI_HOST_HELPERS" --- drivers/pci/controller/dwc/pcie-designware.c | 83 ++++---------------- 1 file changed, 16 insertions(+), 67 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/con= troller/dwc/pcie-designware.c index 4d794964fa0f..b503cb4bcb28 100644 --- a/drivers/pci/controller/dwc/pcie-designware.c +++ b/drivers/pci/controller/dwc/pcie-designware.c @@ -213,83 +213,32 @@ void dw_pcie_version_detect(struct dw_pcie *pci) pci->type =3D ver; } =20 -/* - * These interfaces resemble the pci_find_*capability() interfaces, but th= ese - * are for configuring host controllers, which are bridges *to* PCI device= s but - * are not PCI devices themselves. - */ -static u8 __dw_pcie_find_next_cap(struct dw_pcie *pci, u8 cap_ptr, - u8 cap) +static int dw_pcie_read_cfg(void *priv, int where, int size, u32 *val) { - u8 cap_id, next_cap_ptr; - u16 reg; - - if (!cap_ptr) - return 0; + struct dw_pcie *pci =3D priv; =20 - reg =3D dw_pcie_readw_dbi(pci, cap_ptr); - cap_id =3D (reg & 0x00ff); - - if (cap_id > PCI_CAP_ID_MAX) - return 0; - - if (cap_id =3D=3D cap) - return cap_ptr; + if (size =3D=3D 4) + *val =3D dw_pcie_readl_dbi(pci, where); + else if (size =3D=3D 2) + *val =3D dw_pcie_readw_dbi(pci, where); + else if (size =3D=3D 1) + *val =3D dw_pcie_readb_dbi(pci, where); + else + return PCIBIOS_BAD_REGISTER_NUMBER; =20 - next_cap_ptr =3D (reg & 0xff00) >> 8; - return __dw_pcie_find_next_cap(pci, next_cap_ptr, cap); + return PCIBIOS_SUCCESSFUL; } =20 u8 dw_pcie_find_capability(struct dw_pcie *pci, u8 cap) { - u8 next_cap_ptr; - u16 reg; - - reg =3D dw_pcie_readw_dbi(pci, PCI_CAPABILITY_LIST); - next_cap_ptr =3D (reg & 0x00ff); - - return __dw_pcie_find_next_cap(pci, next_cap_ptr, cap); + return PCI_FIND_NEXT_CAP(dw_pcie_read_cfg, PCI_CAPABILITY_LIST, cap, + pci); } EXPORT_SYMBOL_GPL(dw_pcie_find_capability); =20 -static u16 dw_pcie_find_next_ext_capability(struct dw_pcie *pci, u16 start, - u8 cap) -{ - u32 header; - int ttl; - int pos =3D PCI_CFG_SPACE_SIZE; - - /* minimum 8 bytes per capability */ - ttl =3D (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8; - - if (start) - pos =3D start; - - header =3D dw_pcie_readl_dbi(pci, pos); - /* - * If we have no capabilities, this is indicated by cap ID, - * cap version and next pointer all being 0. - */ - if (header =3D=3D 0) - return 0; - - while (ttl-- > 0) { - if (PCI_EXT_CAP_ID(header) =3D=3D cap && pos !=3D start) - return pos; - - pos =3D PCI_EXT_CAP_NEXT(header); - if (pos < PCI_CFG_SPACE_SIZE) - break; - - header =3D dw_pcie_readl_dbi(pci, pos); - } - - return 0; -} - u16 dw_pcie_find_ext_capability(struct dw_pcie *pci, u8 cap) { - return dw_pcie_find_next_ext_capability(pci, 0, cap); + return PCI_FIND_NEXT_EXT_CAP(dw_pcie_read_cfg, 0, cap, pci); } EXPORT_SYMBOL_GPL(dw_pcie_find_ext_capability); =20 @@ -302,8 +251,8 @@ static u16 __dw_pcie_find_vsec_capability(struct dw_pci= e *pci, u16 vendor_id, if (vendor_id !=3D dw_pcie_readw_dbi(pci, PCI_VENDOR_ID)) return 0; =20 - while ((vsec =3D dw_pcie_find_next_ext_capability(pci, vsec, - PCI_EXT_CAP_ID_VNDR))) { + while ((vsec =3D PCI_FIND_NEXT_EXT_CAP(dw_pcie_read_cfg, vsec, + PCI_EXT_CAP_ID_VNDR, pci))) { header =3D dw_pcie_readl_dbi(pci, vsec + PCI_VNDR_HEADER); if (PCI_VNDR_HEADER_ID(header) =3D=3D vsec_id) return vsec; --=20 2.25.1