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Message-ID: <20211206210224.871651518@linutronix.de>
Date: Mon, 6 Dec 2021 23:27:54 +0100 (CET)
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Bjorn Helgaas <helgaas@...nel.org>, Marc Zygnier <maz@...nel.org>,
Alex Williamson <alex.williamson@...hat.com>,
Kevin Tian <kevin.tian@...el.com>,
Jason Gunthorpe <jgg@...dia.com>,
Megha Dey <megha.dey@...el.com>,
Ashok Raj <ashok.raj@...el.com>, linux-pci@...r.kernel.org,
Cedric Le Goater <clg@...d.org>,
Juergen Gross <jgross@...e.com>,
Michael Ellerman <mpe@...erman.id.au>,
Paul Mackerras <paulus@...ba.org>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
linuxppc-dev@...ts.ozlabs.org,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
linux-mips@...r.kernel.org, Kalle Valo <kvalo@...eaurora.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
sparclinux@...r.kernel.org, x86@...nel.org,
xen-devel@...ts.xenproject.org, ath11k@...ts.infradead.org,
Wei Liu <wei.liu@...nel.org>, linux-hyperv@...r.kernel.org,
Christian Borntraeger <borntraeger@...ibm.com>,
Heiko Carstens <hca@...ux.ibm.com>
Subject: [patch V2 19/23] PCI/MSI: Sanitize MSIX table map handling
Unmapping the MSIX base mapping in the loops which allocate/free MSI
desciptors is daft and in the way of allowing runtime expansion of MSI-X
descriptors.
Store the mapping in struct pci_dev and free it after freeing the MSI-X
descriptors.
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Tested-by: Juergen Gross <jgross@...e.com>
Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
---
drivers/pci/msi/msi.c | 18 ++++++++----------
include/linux/pci.h | 1 +
2 files changed, 9 insertions(+), 10 deletions(-)
--- a/drivers/pci/msi/msi.c
+++ b/drivers/pci/msi/msi.c
@@ -241,14 +241,14 @@ static void free_msi_irqs(struct pci_dev
pci_msi_teardown_msi_irqs(dev);
list_for_each_entry_safe(entry, tmp, msi_list, list) {
- if (entry->pci.msi_attrib.is_msix) {
- if (list_is_last(&entry->list, msi_list))
- iounmap(entry->pci.mask_base);
- }
-
list_del(&entry->list);
free_msi_entry(entry);
}
+
+ if (dev->msix_base) {
+ iounmap(dev->msix_base);
+ dev->msix_base = NULL;
+ }
}
static void pci_intx_for_msi(struct pci_dev *dev, int enable)
@@ -501,10 +501,6 @@ static int msix_setup_entries(struct pci
for (i = 0, curmsk = masks; i < nvec; i++) {
entry = alloc_msi_entry(&dev->dev, 1, curmsk);
if (!entry) {
- if (!i)
- iounmap(base);
- else
- free_msi_irqs(dev);
/* No enough memory. Don't try again */
ret = -ENOMEM;
goto out;
@@ -602,12 +598,14 @@ static int msix_capability_init(struct p
goto out_disable;
}
+ dev->msix_base = base;
+
/* Ensure that all table entries are masked. */
msix_mask_all(base, tsize);
ret = msix_setup_entries(dev, base, entries, nvec, affd);
if (ret)
- goto out_disable;
+ goto out_free;
ret = pci_msi_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSIX);
if (ret)
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -473,6 +473,7 @@ struct pci_dev {
u8 ptm_granularity;
#endif
#ifdef CONFIG_PCI_MSI
+ void __iomem *msix_base;
const struct attribute_group **msi_irq_groups;
#endif
struct pci_vpd vpd;
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