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Message-ID: <372f059069a5551ea1096015f855cc306dbd7cd4.1747368554.git.adrianhoyin.ng@altera.com>
Date: Fri, 16 May 2025 12:13:34 +0800
From: adrianhoyin.ng@...era.com
To: dinguyen@...nel.org,
robh@...nel.org,
krzk+dt@...nel.org,
conor+dt@...nel.org,
maz@...nel.org,
tglx@...utronix.de,
linux-arm-kernel@...ts.infradead.org,
devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: adrianhoyin.ng@...era.com,
Matthew Gerlach <matthew.gerlach@...rera.com>
Subject: [PATCH 3/3] irqchip: gic-v3-its: add support for 32bit addressing
From: Adrian Ng Ho Yin <adrianhoyin.ng@...era.com>
Add quirk to support limited address bus size by allocating buffers within
a 32bit address range.
Signed-off-by: Adrian Ng Ho Yin <adrianhoyin.ng@...era.com>
Reviewed-by: Matthew Gerlach <matthew.gerlach@...rera.com>
---
drivers/irqchip/irq-gic-v3-its.c | 23 +++++++++++++++++++----
1 file changed, 19 insertions(+), 4 deletions(-)
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 0115ad6c8259..7ce40b4bd189 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -54,6 +54,7 @@
#define RD_LOCAL_MEMRESERVE_DONE BIT(2)
static u32 lpi_id_bits;
+static bool dma_32bit_flag;
/*
* We allocate memory for PROPBASE to cover 2 ^ lpi_id_bits LPIs to
@@ -2385,6 +2386,7 @@ static int its_setup_baser(struct its_node *its, struct its_baser *baser,
u32 alloc_pages, psz;
struct page *page;
void *base;
+ gfp_t flags = GFP_KERNEL | __GFP_ZERO;
psz = baser->psz;
alloc_pages = (PAGE_ORDER_TO_SIZE(order) / psz);
@@ -2396,7 +2398,10 @@ static int its_setup_baser(struct its_node *its, struct its_baser *baser,
order = get_order(GITS_BASER_PAGES_MAX * psz);
}
- page = its_alloc_pages_node(its->numa_node, GFP_KERNEL | __GFP_ZERO, order);
+ if (dma_32bit_flag)
+ flags |= GFP_DMA32;
+
+ page = alloc_pages_node(its->numa_node, flags, order);
if (!page)
return -ENOMEM;
@@ -3367,6 +3372,7 @@ static bool its_alloc_table_entry(struct its_node *its,
struct page *page;
u32 esz, idx;
__le64 *table;
+ gfp_t flags = GFP_KERNEL | __GFP_ZERO;
/* Don't allow device id that exceeds single, flat table limit */
esz = GITS_BASER_ENTRY_SIZE(baser->val);
@@ -3382,7 +3388,10 @@ static bool its_alloc_table_entry(struct its_node *its,
/* Allocate memory for 2nd level table */
if (!table[idx]) {
- page = its_alloc_pages_node(its->numa_node, GFP_KERNEL | __GFP_ZERO,
+ if (dma_32bit_flag)
+ flags |= GFP_DMA32;
+
+ page = alloc_pages_node(its->numa_node, flags,
get_order(baser->psz));
if (!page)
return false;
@@ -5227,9 +5236,13 @@ static int __init its_probe_one(struct its_node *its)
struct page *page;
u32 ctlr;
int err;
+ gfp_t flags = GFP_KERNEL | __GFP_ZERO;
its_enable_quirks(its);
+ if (dma_32bit_flag)
+ flags |= GFP_DMA32;
+
if (is_v4(its)) {
if (!(its->typer & GITS_TYPER_VMOVP)) {
err = its_compute_its_list_map(its);
@@ -5260,8 +5273,7 @@ static int __init its_probe_one(struct its_node *its)
}
}
- page = its_alloc_pages_node(its->numa_node,
- GFP_KERNEL | __GFP_ZERO,
+ page = alloc_pages_node(its->numa_node, flags,
get_order(ITS_CMD_QUEUE_SZ));
if (!page) {
err = -ENOMEM;
@@ -5577,6 +5589,8 @@ static int __init its_of_probe(struct device_node *node)
continue;
}
+ if (of_property_read_bool(np, "dma-32bit-quirk"))
+ dma_32bit_flag = true;
its = its_node_init(&res, &np->fwnode, of_node_to_nid(np));
if (!its)
@@ -5811,6 +5825,7 @@ int __init its_init(struct fwnode_handle *handle, struct rdists *rdists,
bool has_v4 = false;
bool has_v4_1 = false;
int err;
+ dma_32bit_flag = false;
itt_pool = gen_pool_create(get_order(ITS_ITT_ALIGN), -1);
if (!itt_pool)
--
2.49.GIT
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