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Commit 88314ee7 authored by David S. Miller's avatar David S. Miller
Browse files

[SPARC64]: Refine PCI strbuf ctx-based flush. 



The initial peek read PIO of the match register is just a waste.
Just do the flush writes first, as that is more efficient.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7c963ad1

arch/sparc64/kernel/pci_iommu.c

+3 −5
Original line number Diff line number Diff line
@@ -422,14 +422,12 @@ static void pci_strbuf_flush(struct pci_strbuf *strbuf, struct pci_iommu *iommu, 
		flushreg = strbuf->strbuf_ctxflush;

		matchreg = PCI_STC_CTXMATCH_ADDR(strbuf, ctx);



		if (pci_iommu_read(matchreg) == 0)

			goto do_flush_sync;



		pci_iommu_write(flushreg, ctx);

		if ((val = pci_iommu_read(matchreg)) == 0)

		val = pci_iommu_read(matchreg);

		val &= 0xffff;

		if (!val)

			goto do_flush_sync;



		val &= 0xffff;

		while (val) {

			if (val & 0x1)

				pci_iommu_write(flushreg, ctx);