This is a note to let you know that I've just added the patch titled
s390: use the correct count for __iowrite64_copy()
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
s390-use-the-correct-count-for-__iowrite64_copy.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 5b5d5cecfee3699a602db2bce15c601f6b272d31
Author: Jason Gunthorpe <jgg@xxxxxxxx>
Date: Fri Feb 16 20:48:14 2024 -0400
s390: use the correct count for __iowrite64_copy()
[ Upstream commit 723a2cc8d69d4342b47dfddbfe6c19f1b135f09b ]
The signature for __iowrite64_copy() requires the number of 64 bit
quantities, not bytes. Multiple by 8 to get to a byte length before
invoking zpci_memcpy_toio()
Fixes: 87bc359b9822 ("s390/pci: speed up __iowrite64_copy by using pci store block insn")
Acked-by: Niklas Schnelle <schnelle@xxxxxxxxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Link: https://lore.kernel.org/r/0-v1-9223d11a7662+1d7785-s390_iowrite64_jgg@xxxxxxxxxx
Signed-off-by: Heiko Carstens <hca@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c
index 9f6f392a44619..66c7f13b0c990 100644
--- a/arch/s390/pci/pci.c
+++ b/arch/s390/pci/pci.c
@@ -273,7 +273,7 @@ resource_size_t pcibios_align_resource(void *data, const struct resource *res,
/* combine single writes by using store-block insn */
void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
{
- zpci_memcpy_toio(to, from, count);
+ zpci_memcpy_toio(to, from, count * 8);
}
/* Create a virtual mapping cookie for a PCI BAR */
