From patchwork Sun Dec 26 15:35:53 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hector Martin X-Patchwork-Id: 12699411 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D7B37C433EF for ; Sun, 26 Dec 2021 15:37:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233833AbhLZPhF (ORCPT ); Sun, 26 Dec 2021 10:37:05 -0500 Received: from marcansoft.com ([212.63.210.85]:55586 "EHLO mail.marcansoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233871AbhLZPhD (ORCPT ); Sun, 26 Dec 2021 10:37:03 -0500 Received: from [127.0.0.1] (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: hector@marcansoft.com) by mail.marcansoft.com (Postfix) with ESMTPSA id 253A8428D9; Sun, 26 Dec 2021 15:36:52 +0000 (UTC) From: Hector Martin To: Kalle Valo , "David S. Miller" , Jakub Kicinski , Rob Herring , "Rafael J. Wysocki" , Len Brown , Arend van Spriel , Franky Lin , Hante Meuleman , Chi-hsien Lin , Wright Feng , Chung-hsien Hsu Cc: Hector Martin , Sven Peter , Alyssa Rosenzweig , Mark Kettenis , =?utf-8?b?UmFmYcWCIE1pxYJlY2tp?= , Pieter-Paul Giesberts , Linus Walleij , Hans de Goede , "John W. Linville" , "Daniel (Deognyoun) Kim" , "brian m. carlson" , linux-wireless@vger.kernel.org, netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, brcm80211-dev-list.pdl@broadcom.com, SHA-cyfmac-dev-list@infineon.com Subject: [PATCH 03/34] brcmfmac: firmware: Support having multiple alt paths Date: Mon, 27 Dec 2021 00:35:53 +0900 Message-Id: <20211226153624.162281-4-marcan@marcan.st> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20211226153624.162281-1-marcan@marcan.st> References: <20211226153624.162281-1-marcan@marcan.st> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Apple platforms have firmware and config files identified with multiple dimensions. We want to be able to find the most specific firmware available for any given platform, progressively trying more general firmwares. First, add support for having multiple alternate firmware paths. Signed-off-by: Hector Martin Acked-by: Linus Walleij --- .../broadcom/brcm80211/brcmfmac/firmware.c | 73 ++++++++++++++----- 1 file changed, 55 insertions(+), 18 deletions(-) diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c index 0eb13e5df517..cc97cd1da44d 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/firmware.c @@ -427,6 +427,8 @@ void brcmf_fw_nvram_free(void *nvram) struct brcmf_fw { struct device *dev; struct brcmf_fw_request *req; + const char **alt_paths; + int alt_index; u32 curpos; void (*done)(struct device *dev, int err, struct brcmf_fw_request *req); }; @@ -592,9 +594,10 @@ static int brcmf_fw_complete_request(const struct firmware *fw, return (cur->flags & BRCMF_FW_REQF_OPTIONAL) ? 0 : ret; } -static char *brcm_alt_fw_path(const char *path, const char *board_type) +static const char **brcm_alt_fw_paths(const char *path, const char *board_type) { char alt_path[BRCMF_FW_NAME_LEN]; + char **alt_paths; char suffix[5]; strscpy(alt_path, path, BRCMF_FW_NAME_LEN); @@ -609,27 +612,46 @@ static char *brcm_alt_fw_path(const char *path, const char *board_type) strlcat(alt_path, board_type, BRCMF_FW_NAME_LEN); strlcat(alt_path, suffix, BRCMF_FW_NAME_LEN); - return kstrdup(alt_path, GFP_KERNEL); + alt_paths = kzalloc(sizeof(char *) * 2, GFP_KERNEL); + alt_paths[0] = kstrdup(alt_path, GFP_KERNEL); + + return (const char **)alt_paths; +} + +static void brcm_free_alt_fw_paths(const char **alt_paths) +{ + int i; + + if (!alt_paths) + return; + + for (i = 0; alt_paths[i]; i++) + kfree(alt_paths[i]); + + kfree(alt_paths); } static int brcmf_fw_request_firmware(const struct firmware **fw, struct brcmf_fw *fwctx) { struct brcmf_fw_item *cur = &fwctx->req->items[fwctx->curpos]; - int ret; + int ret, i; /* Files can be board-specific, first try a board-specific path */ if (cur->type == BRCMF_FW_TYPE_NVRAM && fwctx->req->board_type) { - char *alt_path; + const char **alt_paths = brcm_alt_fw_paths(cur->path, fwctx); - alt_path = brcm_alt_fw_path(cur->path, fwctx->req->board_type); - if (!alt_path) + if (!alt_paths) goto fallback; - ret = request_firmware(fw, alt_path, fwctx->dev); - kfree(alt_path); - if (ret == 0) - return ret; + for (i = 0; alt_paths[i]; i++) { + ret = firmware_request_nowarn(fw, alt_paths[i], fwctx->dev); + if (ret == 0) { + brcm_free_alt_fw_paths(alt_paths); + return ret; + } + } + brcm_free_alt_fw_paths(alt_paths); } fallback: @@ -641,6 +663,9 @@ static void brcmf_fw_request_done(const struct firmware *fw, void *ctx) struct brcmf_fw *fwctx = ctx; int ret; + brcm_free_alt_fw_paths(fwctx->alt_paths); + fwctx->alt_paths = NULL; + ret = brcmf_fw_complete_request(fw, fwctx); while (ret == 0 && ++fwctx->curpos < fwctx->req->n_items) { @@ -662,13 +687,26 @@ static void brcmf_fw_request_done_alt_path(const struct firmware *fw, void *ctx) struct brcmf_fw_item *first = &fwctx->req->items[0]; int ret = 0; - /* Fall back to canonical path if board firmware not found */ - if (!fw) + if (fw) { + brcmf_fw_request_done(fw, ctx); + return; + } + + fwctx->alt_index++; + if (fwctx->alt_paths[fwctx->alt_index]) { + /* Try the next alt firmware */ + ret = request_firmware_nowait(THIS_MODULE, true, + fwctx->alt_paths[fwctx->alt_index], + fwctx->dev, GFP_KERNEL, fwctx, + brcmf_fw_request_done_alt_path); + } else { + /* Fall back to canonical path if board firmware not found */ ret = request_firmware_nowait(THIS_MODULE, true, first->path, fwctx->dev, GFP_KERNEL, fwctx, brcmf_fw_request_done); + } - if (fw || ret < 0) + if (ret < 0) brcmf_fw_request_done(fw, ctx); } @@ -693,7 +731,6 @@ int brcmf_fw_get_firmwares(struct device *dev, struct brcmf_fw_request *req, { struct brcmf_fw_item *first = &req->items[0]; struct brcmf_fw *fwctx; - char *alt_path; int ret; brcmf_dbg(TRACE, "enter: dev=%s\n", dev_name(dev)); @@ -712,12 +749,12 @@ int brcmf_fw_get_firmwares(struct device *dev, struct brcmf_fw_request *req, fwctx->done = fw_cb; /* First try alternative board-specific path if any */ - alt_path = brcm_alt_fw_path(first->path, fwctx->req->board_type); - if (alt_path) { - ret = request_firmware_nowait(THIS_MODULE, true, alt_path, + fwctx->alt_paths = brcm_alt_fw_paths(first->path, fwctx); + if (fwctx->alt_paths) { + fwctx->alt_index = 0; + ret = request_firmware_nowait(THIS_MODULE, true, fwctx->alt_paths[0], fwctx->dev, GFP_KERNEL, fwctx, brcmf_fw_request_done_alt_path); - kfree(alt_path); } else { ret = request_firmware_nowait(THIS_MODULE, true, first->path, fwctx->dev, GFP_KERNEL, fwctx,