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PCI/MSI: Move MSI/MSI-X init to msi.c 

commit cbc40d5c33 upstream.

Conflicts:
        drivers/pci/probe.c
	conflict with the comment's position

Move pci_msi_setup_pci_dev(), which disables MSI and MSI-X interrupts, from
probe.c to msi.c so it's with all the other MSI code and more consistent
with other capability initialization.  This means we must compile msi.c
always, even without CONFIG_PCI_MSI, so wrap the rest of msi.c in an #ifdef
and adjust the Makefile accordingly.  No functional change intended.

Link: https://lore.kernel.org/r/20201203185110.1583077-2-helgaas@kernel.org
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Xinghui Li <korantli@tencent.com>
Signed-off-by: Jianping Liu <frankjpliu@tencent.com>
This commit is contained in:
Bjorn Helgaas 2020-12-03 12:51:08 -06:00 committed by Jianping Liu
parent f6f1ca6db5
commit fa40951618
4 changed files with 42 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/pci/Makefile
View File

@ -5,7 +5,7 @@
obj-$(CONFIG_PCI) += access.o bus.o probe.o host-bridge.o \
remove.o pci.o pci-driver.o search.o \
pci-sysfs.o rom.o setup-res.o irq.o vpd.o \
setup-bus.o vc.o mmap.o setup-irq.o
setup-bus.o vc.o mmap.o setup-irq.o msi.o
ifdef CONFIG_PCI
obj-$(CONFIG_PROC_FS) += proc.o
@ -17,7 +17,6 @@ obj-$(CONFIG_OF) += of.o
obj-$(CONFIG_PCI_QUIRKS) += quirks.o
obj-$(CONFIG_PCIEPORTBUS) += pcie/
obj-$(CONFIG_HOTPLUG_PCI) += hotplug/
obj-$(CONFIG_PCI_MSI) += msi.o
obj-$(CONFIG_PCI_ATS) += ats.o
obj-$(CONFIG_PCI_IOV) += iov.o
obj-$(CONFIG_PCI_BRIDGE_EMUL) += pci-bridge-emul.o

36
drivers/pci/msi.c
View File

@ -26,6 +26,8 @@
#include "pci.h"
#ifdef CONFIG_PCI_MSI
static int pci_msi_enable = 1;
int pci_msi_ignore_mask;
@ -1578,3 +1580,37 @@ struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev)
return dom;
}
#endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */
#endif /* CONFIG_PCI_MSI */
void pci_msi_init(struct pci_dev *dev)
{
u16 ctrl;
/*
* Disable the MSI hardware to avoid screaming interrupts
* during boot. This is the power on reset default so
* usually this should be a noop.
*/
dev->msi_cap = pci_find_capability(dev, PCI_CAP_ID_MSI);
if (!dev->msi_cap)
return;
pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &ctrl);
if (ctrl & PCI_MSI_FLAGS_ENABLE)
pci_write_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS,
ctrl & ~PCI_MSI_FLAGS_ENABLE);
}
void pci_msix_init(struct pci_dev *dev)
{
u16 ctrl;
dev->msix_cap = pci_find_capability(dev, PCI_CAP_ID_MSIX);
if (!dev->msix_cap)
return;
pci_read_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, &ctrl);
if (ctrl & PCI_MSIX_FLAGS_ENABLE)
pci_write_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS,
ctrl & ~PCI_MSIX_FLAGS_ENABLE);
}

2
drivers/pci/pci.h
View File

@ -104,6 +104,8 @@ void pci_config_pm_runtime_get(struct pci_dev *dev);
void pci_config_pm_runtime_put(struct pci_dev *dev);
void pci_pm_init(struct pci_dev *dev);
void pci_ea_init(struct pci_dev *dev);
void pci_msi_init(struct pci_dev *dev);
void pci_msix_init(struct pci_dev *dev);
void pci_allocate_cap_save_buffers(struct pci_dev *dev);
void pci_free_cap_save_buffers(struct pci_dev *dev);
bool pci_bridge_d3_possible(struct pci_dev *dev);

24
drivers/pci/probe.c
View File

@ -1655,22 +1655,6 @@ static u8 pci_hdr_type(struct pci_dev *dev)
#define LEGACY_IO_RESOURCE (IORESOURCE_IO | IORESOURCE_PCI_FIXED)
static void pci_msi_setup_pci_dev(struct pci_dev *dev)
{
/*
* Disable the MSI hardware to avoid screaming interrupts
* during boot. This is the power on reset default so
* usually this should be a noop.
*/
dev->msi_cap = pci_find_capability(dev, PCI_CAP_ID_MSI);
if (dev->msi_cap)
pci_msi_set_enable(dev, 0);
dev->msix_cap = pci_find_capability(dev, PCI_CAP_ID_MSIX);
if (dev->msix_cap)
pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_ENABLE, 0);
}
/**
* pci_intx_mask_broken - Test PCI_COMMAND_INTX_DISABLE writability
* @dev: PCI device
@ -2347,11 +2331,9 @@ void pcie_report_downtraining(struct pci_dev *dev)
static void pci_init_capabilities(struct pci_dev *dev)
{
/* Enhanced Allocation */
pci_ea_init(dev);
/* Setup MSI caps & disable MSI/MSI-X interrupts */
pci_msi_setup_pci_dev(dev);
pci_ea_init(dev); /* Enhanced Allocation */
pci_msi_init(dev); /* Disable MSI */
pci_msix_init(dev); /* Disable MSI-X */
/* Buffers for saving PCIe and PCI-X capabilities */
pci_allocate_cap_save_buffers(dev);