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Tue, 11 Mar 2025 10:24:57 +0000 X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 193cb026-fe63-11ef-9898-31a8f345e629 ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=inqdVN7uVusAHSbG/YVKB1F8Fzw/qJX2aSWG6dgubfDLy4MBmRe/HXNYuylfE4WXCDcLOf4x5EDR4R5OU9evmKczSYTXK30LVHUDFL8t/dVTGBnaFdkRZDWZ56xHToIIdppGg6qZFUXhBojNUX5Dyyv1xrmdytSdt8msutiFMg9f87FlPlR4TwiSZMyIRqjbbL6xPj16jw2Qy7qe20hQdLBQg86+Nu+tvkZlGxLtLFX3x2BPkIL1xCYY7Nm8WkIjt3Mu40KDmhzVMLLseSPDgk1AIglQjeLI5YdKFk9egtnU4ruXXcYH7Bwk/kahxUbZ8IP+H5xXcC4ZQ6oFvC5q4w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; 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To speed things up, we can program ATU only during first access. This is mostly beneficial taking into account the previous patch that adds 1ms delay after ATU reprogramming. Signed-off-by: Volodymyr Babchuk Signed-off-by: Mykyta Poturai --- v1->v2: * rebased --- xen/arch/arm/pci/pci-designware.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/xen/arch/arm/pci/pci-designware.c b/xen/arch/arm/pci/pci-designware.c index def2c12d63..cec52cf81a 100644 --- a/xen/arch/arm/pci/pci-designware.c +++ b/xen/arch/arm/pci/pci-designware.c @@ -272,6 +272,14 @@ static void dw_pcie_prog_outbound_atu(struct pci_host_bridge *pci, int index, int type, uint64_t cpu_addr, uint64_t pci_addr, uint64_t size) { + static uint64_t prev_addr = ~0; + + /* Simple optimization to not-program ATU for every transaction */ + if (prev_addr == pci_addr) + return; + + prev_addr = pci_addr; + __dw_pcie_prog_outbound_atu(pci, 0, index, type, cpu_addr, pci_addr, size); }