From: Andrew Jones <andrew.jones@oss.qualcomm.com>
To: iommu@lists.linux.dev, kvm-riscv@lists.infradead.org,
kvm@vger.kernel.org, linux-riscv@lists.infradead.org,
linux-kernel@vger.kernel.org
Cc: tomasz.jeznach@linux.dev, jgg@ziepe.ca, jgg@nvidia.com,
joro@8bytes.org, will@kernel.org, robin.murphy@arm.com,
pjw@kernel.org, palmer@dabbelt.com, tglx@kernel.org,
anup@brainfault.org, atish.patra@linux.dev,
fangyu.yu@linux.alibaba.com, zhangzhanpeng.jasper@bytedance.com,
zong.li@sifive.com
Subject: [RFC PATCH v3 06/14] iommu/riscv: Cache the programmed device context
Date: Mon, 28 Sep 2026 16:31:05 +0200 [thread overview]
Message-ID: <20260928143113.49838-7-andrew.jones@oss.qualcomm.com> (raw)
In-Reply-To: <20260928143113.49838-1-andrew.jones@oss.qualcomm.com>
Interrupt-remapping state needs to update the MSI fields of an existing
device context without rebuilding its translation fields. Keep the
software copy in the per-device information.
Signed-off-by: Andrew Jones <andrew.jones@oss.qualcomm.com>
---
drivers/iommu/riscv/iommu.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/drivers/iommu/riscv/iommu.c b/drivers/iommu/riscv/iommu.c
index 2cee87ffc122..86d5795a12dd 100644
--- a/drivers/iommu/riscv/iommu.c
+++ b/drivers/iommu/riscv/iommu.c
@@ -872,6 +872,7 @@ PT_IOMMU_CHECK_DOMAIN(struct riscv_iommu_domain, riscvpt.iommu, domain);
/* Private IOMMU data for managed devices, dev_iommu_priv_* */
struct riscv_iommu_info {
struct riscv_iommu_domain *domain;
+ struct riscv_iommu_dc dc;
unsigned int nr_forwarded_irqs;
};
@@ -1513,8 +1514,9 @@ static int riscv_iommu_attach_paging_domain(struct iommu_domain *iommu_domain,
kfree(bond);
return -EBUSY;
}
+ info->dc = dc;
riscv_iommu_bond_link(domain, bond);
- riscv_iommu_iodir_update(dev, &dc);
+ riscv_iommu_iodir_update(dev, &info->dc);
riscv_iommu_bond_unlink(info->domain, dev);
info->domain = domain;
riscv_iommu_msi_tables_unlock(old, iommu_domain, flags);
@@ -1668,7 +1670,8 @@ static int riscv_iommu_attach_blocking_domain(struct iommu_domain *iommu_domain,
/* Make device context invalid, translation requests will fault w/ #258 */
flags = riscv_iommu_msi_tables_lock(old, NULL);
- riscv_iommu_iodir_update(dev, &dc);
+ info->dc = dc;
+ riscv_iommu_iodir_update(dev, &info->dc);
riscv_iommu_bond_unlink(info->domain, dev);
info->domain = NULL;
riscv_iommu_msi_tables_unlock(old, NULL, flags);
@@ -1695,7 +1698,8 @@ static int riscv_iommu_attach_identity_domain(struct iommu_domain *iommu_domain,
dc.ta = RISCV_IOMMU_PC_TA_V;
flags = riscv_iommu_msi_tables_lock(old, NULL);
- riscv_iommu_iodir_update(dev, &dc);
+ info->dc = dc;
+ riscv_iommu_iodir_update(dev, &info->dc);
riscv_iommu_bond_unlink(info->domain, dev);
info->domain = NULL;
riscv_iommu_msi_tables_unlock(old, NULL, flags);
--
2.43.0
next prev parent reply other threads:[~2026-09-28 14:32 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-28 14:30 [RFC PATCH v3 00/14] iommu/riscv: Add irqbypass support Andrew Jones
2026-09-28 14:31 ` [RFC PATCH v3 01/14] iommu/riscv: Allocate MSI tables for second-stage domains Andrew Jones
2026-10-05 13:25 ` Andrew Jones
2026-09-28 14:31 ` [RFC PATCH v3 02/14] iommu/riscv: Prepare domain bonds for outer locking Andrew Jones
2026-09-28 14:31 ` [RFC PATCH v3 03/14] iommu/riscv: Serialize MSI table publication with domain attachment Andrew Jones
2026-09-28 14:31 ` [RFC PATCH v3 04/14] iommu/riscv: Reject live S2 replacement with forwarded IRQs Andrew Jones
2026-09-28 14:31 ` [RFC PATCH v3 05/14] iommu/riscv: Derive the IOMMU from the device in IODIR updates Andrew Jones
2026-09-28 14:31 ` Andrew Jones [this message]
2026-09-28 14:31 ` [RFC PATCH v3 07/14] iommu/riscv: Prepare MSI table updates for interrupt remapping Andrew Jones
2026-09-28 14:31 ` [RFC PATCH v3 08/14] irqchip/riscv-imsic: Define IOMMU IRQ bypass protocol Andrew Jones
2026-09-28 14:31 ` [RFC PATCH v3 09/14] genirq/msi: Provide DOMAIN_BUS_MSI_REMAP Andrew Jones
2026-09-28 14:31 ` [RFC PATCH v3 10/14] iommu/riscv: Add IRQ domain for interrupt remapping Andrew Jones
2026-09-28 14:31 ` [RFC PATCH v3 11/14] iommu/riscv: Prepare info->domain for concurrent RCU access Andrew Jones
2026-09-28 14:31 ` [RFC PATCH v3 12/14] iommu/riscv: Prepare interrupt remapping for IRQ bypass Andrew Jones
2026-09-28 14:31 ` [RFC PATCH v3 13/14] iommu/riscv: Validate IRQ forwarding requests Andrew Jones
2026-09-28 14:31 ` [RFC PATCH v3 14/14] iommu/riscv: Implement IRQ forwarding Andrew Jones
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20260928143113.49838-7-andrew.jones@oss.qualcomm.com \
--to=andrew.jones@oss.qualcomm.com \
--cc=anup@brainfault.org \
--cc=atish.patra@linux.dev \
--cc=fangyu.yu@linux.alibaba.com \
--cc=iommu@lists.linux.dev \
--cc=jgg@nvidia.com \
--cc=jgg@ziepe.ca \
--cc=joro@8bytes.org \
--cc=kvm-riscv@lists.infradead.org \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-riscv@lists.infradead.org \
--cc=palmer@dabbelt.com \
--cc=pjw@kernel.org \
--cc=robin.murphy@arm.com \
--cc=tglx@kernel.org \
--cc=tomasz.jeznach@linux.dev \
--cc=will@kernel.org \
--cc=zhangzhanpeng.jasper@bytedance.com \
--cc=zong.li@sifive.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®