From: Szymon Durawa <szymon.durawa@linux.intel.com>
To: helgaas@kernel.org, nirmal.patel@linux.intel.com,
szymon.durawa@linux.intel.com, djbw@kernel.org,
linux-pci@vger.kernel.org, lukas@wunner.de
Subject: [PATCH v7 6/8] PCI: vmd: Convert bus and busn_start to an array
Date: Wed, 2 Sep 2026 17:58:42 +0000 [thread overview]
Message-ID: <20260902175846.3497854-7-szymon.durawa@linux.intel.com> (raw)
In-Reply-To: <20260902175846.3497854-1-szymon.durawa@linux.intel.com>
Convert bus and busn_start from scalar to an array to support
multiple VMD buses in the future. No functional changes.
Suggested-by: Nirmal Patel <nirmal.patel@linux.intel.com>
Signed-off-by: Szymon Durawa <szymon.durawa@linux.intel.com>
---
drivers/pci/controller/vmd.c | 47 +++++++++++++++++++++---------------
1 file changed, 27 insertions(+), 20 deletions(-)
diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c
index 79ae4a62e29e..681bdd54f050 100644
--- a/drivers/pci/controller/vmd.c
+++ b/drivers/pci/controller/vmd.c
@@ -55,6 +55,11 @@ enum vmd_resource {
VMD_RES_COUNT
};
+enum vmd_rootbus {
+ VMD_BUS_0 = 0,
+ VMD_BUS_COUNT
+};
+
enum vmd_features {
/*
* Device may contain registers which hint the physical location of the
@@ -164,8 +169,8 @@ struct vmd_dev {
struct pci_sysdata sysdata;
struct resource resources[VMD_RES_COUNT];
struct irq_domain *irq_domain;
- struct pci_bus *bus;
- u8 busn_start;
+ struct pci_bus *bus[VMD_BUS_COUNT];
+ u8 busn_start[VMD_BUS_COUNT];
u8 first_vec;
char *name;
int instance;
@@ -425,7 +430,7 @@ static unsigned int vmd_bus_to_ecam(struct vmd_dev *vmd, unsigned int busnr)
if (!!(vmd->features & VMD_FEAT_USE_BIOS_INFO))
return busnr;
- return busnr - vmd->busn_start;
+ return busnr - vmd->busn_start[VMD_BUS_0];
}
static void __iomem *vmd_cfg_addr(struct vmd_dev *vmd, struct pci_bus *bus,
@@ -700,13 +705,13 @@ static int vmd_get_bus_number_start(struct vmd_dev *vmd)
switch (BUS_RESTRICT_CFG(reg)) {
case 0:
- vmd->busn_start = VMD_RESTRICT_0_BUS_START;
+ vmd->busn_start[VMD_BUS_0] = VMD_RESTRICT_0_BUS_START;
break;
case 1:
- vmd->busn_start = VMD_RESTRICT_1_BUS_START;
+ vmd->busn_start[VMD_BUS_0] = VMD_RESTRICT_1_BUS_START;
break;
case 2:
- vmd->busn_start = VMD_RESTRICT_2_BUS_START;
+ vmd->busn_start[VMD_BUS_0] = VMD_RESTRICT_2_BUS_START;
break;
default:
pci_err(dev, "Unknown Bus Offset Setting (%d)\n",
@@ -743,7 +748,7 @@ static int vmd_get_bus_info_from_bar4(struct vmd_dev *vmd,
bar4_2840 = readq(bar4 + BASE_ID_REG_28C1);
base_id = bar4_2840 & 0xFFFFFF;
base_bus = base_id >> 8;
- vmd->busn_start = base_bus;
+ vmd->busn_start[VMD_BUS_0] = base_bus;
/* Calculate offsets like vmd_get_phys_offsets() does. */
if (phys1)
@@ -920,11 +925,11 @@ static void vmd_configure_cfgbar(struct vmd_dev *vmd)
resource_size_t busn_end;
/* Do not let resource[0] end go out of bound.*/
- busn_end = vmd->busn_start + (resource_size(res) >> 20) - 1;
+ busn_end = vmd->busn_start[VMD_BUS_0] + (resource_size(res) >> 20) - 1;
busn_end = min_t(resource_size_t, busn_end, 0xff);
vmd->resources[VMD_RES_CFGBAR] = (struct resource) {
.name = "VMD CFGBAR",
- .start = vmd->busn_start,
+ .start = vmd->busn_start[VMD_BUS_0],
.end = busn_end,
.flags = IORESOURCE_BUS | IORESOURCE_PCI_FIXED,
};
@@ -1005,9 +1010,10 @@ static int vmd_create_bus(struct vmd_dev *vmd, struct pci_sysdata *sd,
pci_add_resource_offset(&resources, &vmd->resources[VMD_RES_MBAR_2],
offset[1]);
- vmd->bus = pci_create_root_bus(&vmd->dev->dev, vmd->busn_start,
- &vmd_ops, sd, &resources);
- if (!vmd->bus) {
+ vmd->bus[VMD_BUS_0] = pci_create_root_bus(&vmd->dev->dev,
+ vmd->busn_start[VMD_BUS_0],
+ &vmd_ops, sd, &resources);
+ if (!vmd->bus[VMD_BUS_0]) {
pci_free_resource_list(&resources);
return -ENODEV;
}
@@ -1015,13 +1021,13 @@ static int vmd_create_bus(struct vmd_dev *vmd, struct pci_sysdata *sd,
/* Don't copy _OSC control flags in VM, it disables features.*/
if (!offset[0] || !offset[1])
vmd_copy_host_bridge_flags(pci_find_host_bridge(vmd->dev->bus),
- to_pci_host_bridge(vmd->bus->bridge));
+ to_pci_host_bridge(vmd->bus[VMD_BUS_0]->bridge));
vmd_attach_resources(vmd);
if (vmd->irq_domain)
- dev_set_msi_domain(&vmd->bus->dev, vmd->irq_domain);
+ dev_set_msi_domain(&vmd->bus[VMD_BUS_0]->dev, vmd->irq_domain);
else
- dev_set_msi_domain(&vmd->bus->dev,
+ dev_set_msi_domain(&vmd->bus[VMD_BUS_0]->dev,
dev_get_msi_domain(&vmd->dev->dev));
return 0;
@@ -1153,10 +1159,11 @@ static int vmd_enable_domain(struct vmd_dev *vmd, unsigned long features)
return ret;
}
- WARN(sysfs_create_link(&vmd->dev->dev.kobj, &vmd->bus->dev.kobj,
- "domain"), "Can't create symlink to domain\n");
+ WARN(sysfs_create_link(&vmd->dev->dev.kobj,
+ &vmd->bus[VMD_BUS_0]->dev.kobj, "domain"),
+ "Can't create symlink to domain\n");
- vmd_bus_enumeration(vmd->bus, features);
+ vmd_bus_enumeration(vmd->bus[VMD_BUS_0], features);
return 0;
}
@@ -1253,9 +1260,9 @@ static void vmd_remove(struct pci_dev *dev)
{
struct vmd_dev *vmd = pci_get_drvdata(dev);
- pci_stop_root_bus(vmd->bus);
+ pci_stop_root_bus(vmd->bus[VMD_BUS_0]);
sysfs_remove_link(&vmd->dev->dev.kobj, "domain");
- pci_remove_root_bus(vmd->bus);
+ pci_remove_root_bus(vmd->bus[VMD_BUS_0]);
vmd_cleanup_srcu(vmd);
vmd_detach_resources(vmd);
vmd_remove_irq_domain(vmd);
--
2.43.0
next prev parent reply other threads:[~2026-09-02 15:34 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-02 17:58 [PATCH v7 0/8] PCI: vmd: Add support for second rootbus under VMD Szymon Durawa
2026-09-02 17:58 ` [PATCH v7 1/8] PCI: vmd: Add vmd_bus_enumeration() helper function Szymon Durawa
2026-09-02 17:58 ` [PATCH v7 2/8] PCI: vmd: Add vmd_configure_cfgbar() " Szymon Durawa
2026-09-02 17:58 ` [PATCH v7 3/8] PCI: vmd: Add vmd_configure_membar() and vmd_configure_membar1_membar2() Szymon Durawa
2026-09-02 17:58 ` [PATCH v7 4/8] PCI: vmd: Add vmd_create_bus() Szymon Durawa
2026-09-02 17:58 ` [PATCH v7 5/8] PCI: vmd: Replace hardcoded values with enum and defines Szymon Durawa
2026-09-02 17:58 ` Szymon Durawa [this message]
2026-09-02 17:58 ` [PATCH v7 7/8] PCI: vmd: Add support for second rootbus under VMD Szymon Durawa
2026-09-02 17:58 ` [PATCH v7 8/8] PCI: vmd: Add workaround for bus number hardwired to fixed non-zero value Szymon Durawa
2026-09-03 20:58 ` Bjorn Helgaas
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=20260902175846.3497854-7-szymon.durawa@linux.intel.com \
--to=szymon.durawa@linux.intel.com \
--cc=djbw@kernel.org \
--cc=helgaas@kernel.org \
--cc=linux-pci@vger.kernel.org \
--cc=lukas@wunner.de \
--cc=nirmal.patel@linux.intel.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