From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marc Zyngier Subject: [PATCH v3 06/59] irqchip/gic-v3-its: Macro-ize its_send_single_command Date: Mon, 31 Jul 2017 18:25:44 +0100 Message-ID: <20170731172637.29355-7-marc.zyngier@arm.com> References: <20170731172637.29355-1-marc.zyngier@arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: Jason Cooper , Thomas Gleixner To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org Return-path: In-Reply-To: <20170731172637.29355-1-marc.zyngier@arm.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu List-Id: kvm.vger.kernel.org Most ITS commands do operate on a collection object, and require a SYNC command to be performed on that collection in order to guarantee the execution of the first command. With GICv4 ITS, another set of commands perform similar operations on a VPE object, and a VSYNC operations must be executed to guarantee their execution. Given the similarities (post a command, perform a synchronization operation on a sync object), it makes sense to reuse the same mechanism for both class of commands. Let's start with turning its_send_single_command into a huge macro that performs the bulk of the work, and a set of helpers that make this macro usable for the GICv3 ITS commands. Signed-off-by: Marc Zyngier --- drivers/irqchip/irq-gic-v3-its.c | 84 ++++++++++++++++++++++------------------ 1 file changed, 47 insertions(+), 37 deletions(-) diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index e7a7dc9ad585..0f345c0fa700 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -488,43 +488,53 @@ static void its_wait_for_range_completion(struct its_node *its, } } -static void its_send_single_command(struct its_node *its, - its_cmd_builder_t builder, - struct its_cmd_desc *desc) -{ - struct its_cmd_block *cmd, *sync_cmd, *next_cmd; - struct its_collection *sync_col; - unsigned long flags; - - raw_spin_lock_irqsave(&its->lock, flags); - - cmd = its_allocate_entry(its); - if (!cmd) { /* We're soooooo screewed... */ - pr_err_ratelimited("ITS can't allocate, dropping command\n"); - raw_spin_unlock_irqrestore(&its->lock, flags); - return; - } - sync_col = builder(cmd, desc); - its_flush_cmd(its, cmd); - - if (sync_col) { - sync_cmd = its_allocate_entry(its); - if (!sync_cmd) { - pr_err_ratelimited("ITS can't SYNC, skipping\n"); - goto post; - } - its_encode_cmd(sync_cmd, GITS_CMD_SYNC); - its_encode_target(sync_cmd, sync_col->target_address); - its_fixup_cmd(sync_cmd); - its_flush_cmd(its, sync_cmd); - } - -post: - next_cmd = its_post_commands(its); - raw_spin_unlock_irqrestore(&its->lock, flags); - - its_wait_for_range_completion(its, cmd, next_cmd); -} +/* Warning, macro hell follows */ +#define BUILD_SINGLE_CMD_FUNC(name, buildtype, synctype, buildfn) \ +void name(struct its_node *its, \ + buildtype builder, \ + struct its_cmd_desc *desc) \ +{ \ + struct its_cmd_block *cmd, *sync_cmd, *next_cmd; \ + synctype *sync_obj; \ + unsigned long flags; \ + \ + raw_spin_lock_irqsave(&its->lock, flags); \ + \ + cmd = its_allocate_entry(its); \ + if (!cmd) { /* We're soooooo screewed... */ \ + raw_spin_unlock_irqrestore(&its->lock, flags); \ + return; \ + } \ + sync_obj = builder(cmd, desc); \ + its_flush_cmd(its, cmd); \ + \ + if (sync_obj) { \ + sync_cmd = its_allocate_entry(its); \ + if (!sync_cmd) \ + goto post; \ + \ + buildfn(sync_cmd, sync_obj); \ + its_flush_cmd(its, sync_cmd); \ + } \ + \ +post: \ + next_cmd = its_post_commands(its); \ + raw_spin_unlock_irqrestore(&its->lock, flags); \ + \ + its_wait_for_range_completion(its, cmd, next_cmd); \ +} + +static void its_build_sync_cmd(struct its_cmd_block *sync_cmd, + struct its_collection *sync_col) +{ + its_encode_cmd(sync_cmd, GITS_CMD_SYNC); + its_encode_target(sync_cmd, sync_col->target_address); + + its_fixup_cmd(sync_cmd); +} + +static BUILD_SINGLE_CMD_FUNC(its_send_single_command, its_cmd_builder_t, + struct its_collection, its_build_sync_cmd) static void its_send_inv(struct its_device *dev, u32 event_id) { -- 2.11.0