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s390/pci: speed up __iowrite64_copy by using pci store block insn
Benefit from pci store block instruction by writing up to 128 bytes with a single instruction to MMIO space. Depending on the workload this can result in a huge performance increase due to the reduced number of instructions. The ordering guarantees of single stores vs. one store block are identical. Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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1 changed files with 6 additions and 0 deletions
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@ -355,6 +355,12 @@ resource_size_t pcibios_align_resource(void *data, const struct resource *res,
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return 0;
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}
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/* combine single writes by using store-block insn */
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void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
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{
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zpci_memcpy_toio(to, from, count);
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}
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/* Create a virtual mapping cookie for a PCI BAR */
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void __iomem *pci_iomap(struct pci_dev *pdev, int bar, unsigned long max)
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{
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