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author | Marc Zyngier <maz@kernel.org> | 2020-03-04 20:33:14 +0000 |
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committer | Marc Zyngier <maz@kernel.org> | 2020-03-20 17:48:38 +0000 |
commit | 5e46a48413a6660955de7e56f9f364f2b890381c (patch) | |
tree | df33215ba3594dfabcec08f3c1a69e8f85cfcd1f /drivers/irqchip | |
parent | 3c40706d05fdea421e991da50e72a29d41131a66 (diff) | |
download | linux-5e46a48413a6660955de7e56f9f364f2b890381c.tar.gz linux-5e46a48413a6660955de7e56f9f364f2b890381c.tar.bz2 linux-5e46a48413a6660955de7e56f9f364f2b890381c.zip |
irqchip/gic-v4.1: Map the ITS SGIR register page
One of the new features of GICv4.1 is to allow virtual SGIs to be
directly signaled to a VPE. For that, the ITS has grown a new
64kB page containing only a single register that is used to
signal a SGI to a given VPE.
Add a second mapping covering this new 64kB range, and take this
opportunity to limit the original mapping to 64kB, which is enough
to cover the span of the ITS registers.
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Link: https://lore.kernel.org/r/20200304203330.4967-8-maz@kernel.org
Diffstat (limited to 'drivers/irqchip')
-rw-r--r-- | drivers/irqchip/irq-gic-v3-its.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index bcc1a0957cda..54d6fdf7a28e 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -96,6 +96,7 @@ struct its_node { struct mutex dev_alloc_lock; struct list_head entry; void __iomem *base; + void __iomem *sgir_base; phys_addr_t phys_base; struct its_cmd_block *cmd_base; struct its_cmd_block *cmd_write; @@ -4456,7 +4457,7 @@ static int __init its_probe_one(struct resource *res, struct page *page; int err; - its_base = ioremap(res->start, resource_size(res)); + its_base = ioremap(res->start, SZ_64K); if (!its_base) { pr_warn("ITS@%pa: Unable to map ITS registers\n", &res->start); return -ENOMEM; @@ -4507,6 +4508,13 @@ static int __init its_probe_one(struct resource *res, if (is_v4_1(its)) { u32 svpet = FIELD_GET(GITS_TYPER_SVPET, typer); + + its->sgir_base = ioremap(res->start + SZ_128K, SZ_64K); + if (!its->sgir_base) { + err = -ENOMEM; + goto out_free_its; + } + its->mpidr = readl_relaxed(its_base + GITS_MPIDR); pr_info("ITS@%pa: Using GICv4.1 mode %08x %08x\n", @@ -4520,7 +4528,7 @@ static int __init its_probe_one(struct resource *res, get_order(ITS_CMD_QUEUE_SZ)); if (!page) { err = -ENOMEM; - goto out_free_its; + goto out_unmap_sgir; } its->cmd_base = (void *)page_address(page); its->cmd_write = its->cmd_base; @@ -4587,6 +4595,9 @@ out_free_tables: its_free_tables(its); out_free_cmd: free_pages((unsigned long)its->cmd_base, get_order(ITS_CMD_QUEUE_SZ)); +out_unmap_sgir: + if (its->sgir_base) + iounmap(its->sgir_base); out_free_its: kfree(its); out_unmap: |