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charset="utf-8" Implement TODO by calling the INVALL command. It is working on real HW, so there is no sense in not doing this. Signed-off-by: Volodymyr Babchuk --- xen/arch/arm/gic-v3-its.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) diff --git a/xen/arch/arm/gic-v3-its.c b/xen/arch/arm/gic-v3-its.c index 3aa4edda10..a9c971a55f 100644 --- a/xen/arch/arm/gic-v3-its.c +++ b/xen/arch/arm/gic-v3-its.c @@ -236,6 +236,19 @@ static int its_send_cmd_inv(struct host_its *its, return its_send_command(its, cmd); } =20 +static int its_send_cmd_invall(struct host_its *its, + uint32_t collection_id) +{ + uint64_t cmd[4]; + + cmd[0] =3D GITS_CMD_INVALL; + cmd[1] =3D 0x00; + cmd[2] =3D collection_id; + cmd[3] =3D 0x00; + + return its_send_command(its, cmd); +} + /* Set up the (1:1) collection mapping for the given host CPU. */ int gicv3_its_setup_collection(unsigned int cpu) { @@ -593,7 +606,9 @@ static int gicv3_its_map_host_events(struct host_its *i= ts, return ret; } =20 - /* TODO: Consider using INVALL here. 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charset="utf-8" There is no need to invalidate cache entry because we just wrote into a memory region. Writing itself guarantees that cache entry is valid. But we still need to flush cache line to be sure that ITS sees a command written into a queue. Signed-off-by: Volodymyr Babchuk --- xen/arch/arm/gic-v3-its.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/xen/arch/arm/gic-v3-its.c b/xen/arch/arm/gic-v3-its.c index a9c971a55f..72cf318810 100644 --- a/xen/arch/arm/gic-v3-its.c +++ b/xen/arch/arm/gic-v3-its.c @@ -108,8 +108,7 @@ static int its_send_command(struct host_its *hw_its, co= nst void *its_cmd) =20 memcpy(hw_its->cmd_buf + writep, its_cmd, ITS_CMD_SIZE); if ( hw_its->flags & HOST_ITS_FLUSH_CMD_QUEUE ) - clean_and_invalidate_dcache_va_range(hw_its->cmd_buf + writep, - ITS_CMD_SIZE); + clean_dcache_va_range(hw_its->cmd_buf + writep, ITS_CMD_SIZE); else dsb(ishst); =20 --=20 2.42.0 From nobody Tue May 14 21:30:15 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; 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Tue, 19 Sep 2023 11:28:54 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version 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: c23e9537-56df-11ee-9b0d-b553b5be7939 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=gLilNPs08Rt5sVq9NO42OZoTSwkgK5uDt4fZnKYKm4+7qnyRZxDQJXhC80Z9mhl28gLZMO4E8e3E1HsWwr/BEPQsfh2c/pIEHfmTxBg6RyzpLBtAw4g4Cwl38pSyLhTqiSq4D2RZ1qyRpmEaRl8ExoEAp/zEoeVSRWTLKMHobhGZCFogCYdJr1PoYDfDhrNU0WKMY05q15qk62jAydi/1kfbnpjBe7MrzHeXgKCkRec31Sf70U3mjMDFzQUdgcvk2rN8P1qWL/49I+ep59rylOhbC3rENMqVSlhB+EuUyn9n9L+vChMkV+wUeocc3Ol3puwbDtRs0ADindPj0ESZMA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; 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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charset="utf-8" ITS manages Device Tables and Interrupt Translation Tables on its own, so generally we are not interested which shareability and cacheability attributes it uses. But there is one exception: ITS requires that DT and ITT must be initialized with zeroes. If ITS belongs to the Inner Cacheability domain there is no problem at all. But in all other cases we need to do clean CPU caches manually, or otherwise CPU can overwrite DT and ITT entries. From user perspective this looks like interrupts are not delivered from a device. Also, we will rename HOST_ITS_FLUSH_CMD_QUEUE flag to HOST_ITS_FLUSH_BUFFERS because now this flag controls not only command queue. Signed-off-by: Volodymyr Babchuk Tested-by: Stewart Hildebrand --- xen/arch/arm/gic-v3-its.c | 7 +++++-- xen/arch/arm/include/asm/gic_v3_its.h | 2 +- 2 files changed, 6 insertions(+), 3 deletions(-) diff --git a/xen/arch/arm/gic-v3-its.c b/xen/arch/arm/gic-v3-its.c index 72cf318810..63e28a7706 100644 --- a/xen/arch/arm/gic-v3-its.c +++ b/xen/arch/arm/gic-v3-its.c @@ -107,7 +107,7 @@ static int its_send_command(struct host_its *hw_its, co= nst void *its_cmd) } =20 memcpy(hw_its->cmd_buf + writep, its_cmd, ITS_CMD_SIZE); - if ( hw_its->flags & HOST_ITS_FLUSH_CMD_QUEUE ) + if ( hw_its->flags & HOST_ITS_FLUSH_BUFFERS ) clean_dcache_va_range(hw_its->cmd_buf + writep, ITS_CMD_SIZE); else dsb(ishst); @@ -335,7 +335,7 @@ static void *its_map_cbaser(struct host_its *its) */ if ( !(reg & GITS_BASER_INNER_CACHEABILITY_MASK) ) { - its->flags |=3D HOST_ITS_FLUSH_CMD_QUEUE; + its->flags |=3D HOST_ITS_FLUSH_BUFFERS; printk(XENLOG_WARNING "using non-cacheable ITS command queue\n"); } =20 @@ -699,6 +699,9 @@ int gicv3_its_map_guest_device(struct domain *d, if ( !itt_addr ) goto out_unlock; =20 + if ( hw_its->flags & HOST_ITS_FLUSH_BUFFERS ) + clean_dcache_va_range(itt_addr, nr_events * hw_its->itte_size); + dev =3D xzalloc(struct its_device); if ( !dev ) goto out_unlock; diff --git a/xen/arch/arm/include/asm/gic_v3_its.h b/xen/arch/arm/include/a= sm/gic_v3_its.h index c24d4752d0..460b008db5 100644 --- a/xen/arch/arm/include/asm/gic_v3_its.h +++ b/xen/arch/arm/include/asm/gic_v3_its.h @@ -107,7 +107,7 @@ #include #include =20 -#define HOST_ITS_FLUSH_CMD_QUEUE (1U << 0) +#define HOST_ITS_FLUSH_BUFFERS (1U << 0) #define HOST_ITS_USES_PTA (1U << 1) =20 /* We allocate LPIs on the hosts in chunks of 32 to reduce handling overhe= ad. */ --=20 2.42.0