From patchwork Fri Mar 29 09:09:28 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Damien Le Moal X-Patchwork-Id: 13610391 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5DBED37711 for ; Fri, 29 Mar 2024 09:09:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711703391; cv=none; b=mrXQIzILCo75kHlMy3DLNrhgCk94lLslAeFZAM6LiccUN44uSMUMQzi3wnlzx0tAX8bW0dXKRPRUO9wm3xcQ2roCf72nDPGaziz+vH6DGRO4GxzVNTd0IptjMopf/NCZ2M8+27DCpjfCQvTr5QFwxa8C3R5NbqPxNRRMXAEFStc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711703391; c=relaxed/simple; bh=qCEbulFduSNumMtAvNmv8e5o53wv9ou11qaVvfYDl1I=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=d1CsBF4AkGNCfK5WJ2OhzooS76Ya49cl9Czu1x8GBJOAR6SZiU6tBjaWkzQ5UUGBfE06HshYFC1iC2I9EDrmARo8u3nP6GBNL4LZRF3VZcZn9D6yr1yvViE6Rkc0qVCzeK2HCTTIGeIM79Bk6ofEoipz4ryMNSEop0qlyhqMDsk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=cUcoX29l; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="cUcoX29l" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 12B86C433F1; Fri, 29 Mar 2024 09:09:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1711703391; bh=qCEbulFduSNumMtAvNmv8e5o53wv9ou11qaVvfYDl1I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cUcoX29lxqP3o/uu5GkmylQ2N850ka0wERjw1dqVGb49wl7di7Chx0LGV2MOCRhbf YqKB3lJs/srqXgJ5ESNp6dZ3FaLEnHfd+pvParjPRNtUsxYI28M4he6fNjxH8gGHLU H7df1HYmk4+ztyZJNKs1EjUUKhQczPTNjirJVWAMAuMHc9MeH93nnv3IyBo0uDnm+s 7EqxmefJG217c4x1jln5dUCW03VRDdAiYRD3BQ7Z75YOdfz5LvQ0dKDfKTyiedV1+N 4wQszNQW/LElYGRNMZr9hT4j6WO/z4uUWXtfYFpRQxIxUnLDx4ZraHS11pnJymWiy3 9ywVSWSZXFotQ== From: Damien Le Moal To: Manivannan Sadhasivam , Kishon Vijay Abraham I , Shawn Lin , =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= , Bjorn Helgaas , Heiko Stuebner , linux-pci@vger.kernel.org Cc: linux-rockchip@lists.infradead.org Subject: [PATCH 02/19] PCI: endpoint: Improve pci_epc_mem_alloc_addr() Date: Fri, 29 Mar 2024 18:09:28 +0900 Message-ID: <20240329090945.1097609-3-dlemoal@kernel.org> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240329090945.1097609-1-dlemoal@kernel.org> References: <20240329090945.1097609-1-dlemoal@kernel.org> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 There is no point in attempting to allocate memory from an endpoint controller memory window if the requested size is larger than the window size. Add a check to skip bitmap_find_free_region() calls for such case. Also change the final return to return NULL to simplify the code. Signed-off-by: Damien Le Moal --- drivers/pci/endpoint/pci-epc-mem.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/pci/endpoint/pci-epc-mem.c b/drivers/pci/endpoint/pci-epc-mem.c index a9c028f58da1..218a60e945db 100644 --- a/drivers/pci/endpoint/pci-epc-mem.c +++ b/drivers/pci/endpoint/pci-epc-mem.c @@ -178,7 +178,7 @@ EXPORT_SYMBOL_GPL(pci_epc_mem_exit); void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc, phys_addr_t *phys_addr, size_t size) { - void __iomem *virt_addr = NULL; + void __iomem *virt_addr; struct pci_epc_mem *mem; unsigned int page_shift; size_t align_size; @@ -188,10 +188,13 @@ void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc, for (i = 0; i < epc->num_windows; i++) { mem = epc->windows[i]; - mutex_lock(&mem->lock); + if (size > mem->window.size) + continue; + align_size = ALIGN(size, mem->window.page_size); order = pci_epc_mem_get_order(mem, align_size); + mutex_lock(&mem->lock); pageno = bitmap_find_free_region(mem->bitmap, mem->pages, order); if (pageno >= 0) { @@ -211,7 +214,7 @@ void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc, mutex_unlock(&mem->lock); } - return virt_addr; + return NULL; } EXPORT_SYMBOL_GPL(pci_epc_mem_alloc_addr);