linux-kernel - [PATCH v2 2/2] irqchip/gic-v3-its: Rely on genpool alignment

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Message-Id: <20241002141630.433502-3-steven.price@arm.com>
Date: Wed,  2 Oct 2024 15:16:30 +0100
From: Steven Price <steven.price@....com>
To: Marc Zyngier <maz@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Cc: Steven Price <steven.price@....com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Will Deacon <will@...nel.org>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Michael Kelley <mhklinux@...look.com>
Subject: [PATCH v2 2/2] irqchip/gic-v3-its: Rely on genpool alignment

its_create_device() over-allocated by ITS_ITT_ALIGN - 1 bytes to ensure
that an aligned area was available within the allocation. The new
genpool allocator has its min_alloc_order set to
get_order(ITS_ITT_ALIGN) so all allocations from it should be
appropriately aligned.

Remove the over-allocation from its_create_device() and alignment from
its_build_mapd_cmd().

Tested-by: Will Deacon <will@...nel.org>
Reviewed-by: Marc Zyngier <maz@...nel.org>
Signed-off-by: Steven Price <steven.price@....com>
---
 drivers/irqchip/irq-gic-v3-its.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 7a62fd3a8673..1d2a952e342d 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -712,7 +712,6 @@ static struct its_collection *its_build_mapd_cmd(struct its_node *its,
 	u8 size = ilog2(desc->its_mapd_cmd.dev->nr_ites);
 
 	itt_addr = virt_to_phys(desc->its_mapd_cmd.dev->itt);
-	itt_addr = ALIGN(itt_addr, ITS_ITT_ALIGN);
 
 	its_encode_cmd(cmd, GITS_CMD_MAPD);
 	its_encode_devid(cmd, desc->its_mapd_cmd.dev->device_id);
@@ -3501,7 +3500,7 @@ static struct its_device *its_create_device(struct its_node *its, u32 dev_id,
 	 */
 	nr_ites = max(2, nvecs);
 	sz = nr_ites * (FIELD_GET(GITS_TYPER_ITT_ENTRY_SIZE, its->typer) + 1);
-	sz = max(sz, ITS_ITT_ALIGN) + ITS_ITT_ALIGN - 1;
+	sz = max(sz, ITS_ITT_ALIGN);
 
 	itt = itt_alloc_pool(its->numa_node, sz);
 
-- 
2.34.1