From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2001:1868:205::9]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id D83F71A067D for ; Wed, 12 Aug 2015 17:09:26 +1000 (AEST) From: Christoph Hellwig To: torvalds@linux-foundation.org, axboe@kernel.dk Cc: dan.j.williams@intel.com, vgupta@synopsys.com, hskinnemoen@gmail.com, egtvedt@samfundet.no, realmz6@gmail.com, dhowells@redhat.com, monstr@monstr.eu, x86@kernel.org, dwmw2@infradead.org, alex.williamson@redhat.com, grundler@parisc-linux.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-alpha@vger.kernel.org, linux-ia64@vger.kernel.org, linux-metag@vger.kernel.org, linux-mips@linux-mips.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-xtensa@linux-xtensa.org, linux-nvdimm@ml01.01.org, linux-media@vger.kernel.org Subject: [PATCH 14/31] sparc32/io-unit: handle page-less SG entries Date: Wed, 12 Aug 2015 09:05:33 +0200 Message-Id: <1439363150-8661-15-git-send-email-hch@lst.de> In-Reply-To: <1439363150-8661-1-git-send-email-hch@lst.de> References: <1439363150-8661-1-git-send-email-hch@lst.de> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , For the iommu offset we just need and offset into the page. Calculate that using the physical address instead of using the virtual address so that we don't require a virtual mapping. Signed-off-by: Christoph Hellwig --- arch/sparc/mm/io-unit.c | 23 ++++++++++++----------- 1 file changed, 12 insertions(+), 11 deletions(-) diff --git a/arch/sparc/mm/io-unit.c b/arch/sparc/mm/io-unit.c index f311bf2..82f97ae 100644 --- a/arch/sparc/mm/io-unit.c +++ b/arch/sparc/mm/io-unit.c @@ -91,13 +91,14 @@ static int __init iounit_init(void) subsys_initcall(iounit_init); /* One has to hold iounit->lock to call this */ -static unsigned long iounit_get_area(struct iounit_struct *iounit, unsigned long vaddr, int size) +static dma_addr_t iounit_get_area(struct iounit_struct *iounit, + unsigned long paddr, int size) { int i, j, k, npages; - unsigned long rotor, scan, limit; + unsigned long rotor, scan, limit, dma_addr; iopte_t iopte; - npages = ((vaddr & ~PAGE_MASK) + size + (PAGE_SIZE-1)) >> PAGE_SHIFT; + npages = ((paddr & ~PAGE_MASK) + size + (PAGE_SIZE-1)) >> PAGE_SHIFT; /* A tiny bit of magic ingredience :) */ switch (npages) { @@ -106,7 +107,7 @@ static unsigned long iounit_get_area(struct iounit_struct *iounit, unsigned long default: i = 0x0213; break; } - IOD(("iounit_get_area(%08lx,%d[%d])=", vaddr, size, npages)); + IOD(("iounit_get_area(%08lx,%d[%d])=", paddr, size, npages)); next: j = (i & 15); rotor = iounit->rotor[j - 1]; @@ -121,7 +122,7 @@ nexti: scan = find_next_zero_bit(iounit->bmap, limit, scan); } i >>= 4; if (!(i & 15)) - panic("iounit_get_area: Couldn't find free iopte slots for (%08lx,%d)\n", vaddr, size); + panic("iounit_get_area: Couldn't find free iopte slots for (%08lx,%d)\n", paddr, size); goto next; } for (k = 1, scan++; k < npages; k++) @@ -129,14 +130,14 @@ nexti: scan = find_next_zero_bit(iounit->bmap, limit, scan); goto nexti; iounit->rotor[j - 1] = (scan < limit) ? scan : iounit->limit[j - 1]; scan -= npages; - iopte = MKIOPTE(__pa(vaddr & PAGE_MASK)); - vaddr = IOUNIT_DMA_BASE + (scan << PAGE_SHIFT) + (vaddr & ~PAGE_MASK); + iopte = MKIOPTE(paddr & PAGE_MASK); + dma_addr = IOUNIT_DMA_BASE + (scan << PAGE_SHIFT) + (paddr & ~PAGE_MASK); for (k = 0; k < npages; k++, iopte = __iopte(iopte_val(iopte) + 0x100), scan++) { set_bit(scan, iounit->bmap); sbus_writel(iopte, &iounit->page_table[scan]); } - IOD(("%08lx\n", vaddr)); - return vaddr; + IOD(("%08lx\n", dma_addr)); + return dma_addr; } static __u32 iounit_get_scsi_one(struct device *dev, char *vaddr, unsigned long len) @@ -145,7 +146,7 @@ static __u32 iounit_get_scsi_one(struct device *dev, char *vaddr, unsigned long unsigned long ret, flags; spin_lock_irqsave(&iounit->lock, flags); - ret = iounit_get_area(iounit, (unsigned long)vaddr, len); + ret = iounit_get_area(iounit, virt_to_phys(vaddr), len); spin_unlock_irqrestore(&iounit->lock, flags); return ret; } @@ -159,7 +160,7 @@ static void iounit_get_scsi_sgl(struct device *dev, struct scatterlist *sg, int spin_lock_irqsave(&iounit->lock, flags); while (sz != 0) { --sz; - sg->dma_address = iounit_get_area(iounit, (unsigned long) sg_virt(sg), sg->length); + sg->dma_address = iounit_get_area(iounit, sg_phys(sg), sg->length); sg->dma_length = sg->length; sg = sg_next(sg); } -- 1.9.1