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Received: from clnet-p099-196.ikbnet.co.at ([83.175.99.196] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.87 #1 (Red Hat Linux)) id 1dLvjP-0005mB-J6; Fri, 16 Jun 2017 18:12:28 +0000 From: Christoph Hellwig To: x86@kernel.org, linux-arm-kernel@lists.infradead.org, xen-devel@lists.xenproject.org, linux-c6x-dev@linux-c6x.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, linux-mips@linux-mips.org, openrisc@lists.librecores.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-xtensa@linux-xtensa.org, dmaengine@vger.kernel.org, linux-tegra@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-samsung-soc@vger.kernel.org, iommu@lists.linux-foundation.org, netdev@vger.kernel.org Date: Fri, 16 Jun 2017 20:10:38 +0200 Message-Id: <20170616181059.19206-24-hch@lst.de> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170616181059.19206-1-hch@lst.de> References: <20170616181059.19206-1-hch@lst.de> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Cc: linux-kernel@vger.kernel.org Subject: [Xen-devel] [PATCH 23/44] x86/calgary: implement ->mapping_error X-BeenThere: xen-devel@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" X-Virus-Scanned: ClamAV using ClamSMTP DMA_ERROR_CODE is going to go away, so don't rely on it. Signed-off-by: Christoph Hellwig --- arch/x86/kernel/pci-calgary_64.c | 24 ++++++++++++++++-------- 1 file changed, 16 insertions(+), 8 deletions(-) diff --git a/arch/x86/kernel/pci-calgary_64.c b/arch/x86/kernel/pci-calgary_64.c index fda7867046d0..e75b490f2b0b 100644 --- a/arch/x86/kernel/pci-calgary_64.c +++ b/arch/x86/kernel/pci-calgary_64.c @@ -50,6 +50,8 @@ #include #include +#define CALGARY_MAPPING_ERROR 0 + #ifdef CONFIG_CALGARY_IOMMU_ENABLED_BY_DEFAULT int use_calgary __read_mostly = 1; #else @@ -252,7 +254,7 @@ static unsigned long iommu_range_alloc(struct device *dev, if (panic_on_overflow) panic("Calgary: fix the allocator.\n"); else - return DMA_ERROR_CODE; + return CALGARY_MAPPING_ERROR; } } @@ -272,10 +274,10 @@ static dma_addr_t iommu_alloc(struct device *dev, struct iommu_table *tbl, entry = iommu_range_alloc(dev, tbl, npages); - if (unlikely(entry == DMA_ERROR_CODE)) { + if (unlikely(entry == CALGARY_MAPPING_ERROR)) { pr_warn("failed to allocate %u pages in iommu %p\n", npages, tbl); - return DMA_ERROR_CODE; + return CALGARY_MAPPING_ERROR; } /* set the return dma address */ @@ -295,7 +297,7 @@ static void iommu_free(struct iommu_table *tbl, dma_addr_t dma_addr, unsigned long flags; /* were we called with bad_dma_address? */ - badend = DMA_ERROR_CODE + (EMERGENCY_PAGES * PAGE_SIZE); + badend = CALGARY_MAPPING_ERROR + (EMERGENCY_PAGES * PAGE_SIZE); if (unlikely(dma_addr < badend)) { WARN(1, KERN_ERR "Calgary: driver tried unmapping bad DMA " "address 0x%Lx\n", dma_addr); @@ -380,7 +382,7 @@ static int calgary_map_sg(struct device *dev, struct scatterlist *sg, npages = iommu_num_pages(vaddr, s->length, PAGE_SIZE); entry = iommu_range_alloc(dev, tbl, npages); - if (entry == DMA_ERROR_CODE) { + if (entry == CALGARY_MAPPING_ERROR) { /* makes sure unmap knows to stop */ s->dma_length = 0; goto error; @@ -398,7 +400,7 @@ static int calgary_map_sg(struct device *dev, struct scatterlist *sg, error: calgary_unmap_sg(dev, sg, nelems, dir, 0); for_each_sg(sg, s, nelems, i) { - sg->dma_address = DMA_ERROR_CODE; + sg->dma_address = CALGARY_MAPPING_ERROR; sg->dma_length = 0; } return 0; @@ -453,7 +455,7 @@ static void* calgary_alloc_coherent(struct device *dev, size_t size, /* set up tces to cover the allocated range */ mapping = iommu_alloc(dev, tbl, ret, npages, DMA_BIDIRECTIONAL); - if (mapping == DMA_ERROR_CODE) + if (mapping == CALGARY_MAPPING_ERROR) goto free; *dma_handle = mapping; return ret; @@ -478,6 +480,11 @@ static void calgary_free_coherent(struct device *dev, size_t size, free_pages((unsigned long)vaddr, get_order(size)); } +static int calgary_mapping_error(struct device *dev, dma_addr_t dma_addr) +{ + return dma_addr == CALGARY_MAPPING_ERROR; +} + static const struct dma_map_ops calgary_dma_ops = { .alloc = calgary_alloc_coherent, .free = calgary_free_coherent, @@ -485,6 +492,7 @@ static const struct dma_map_ops calgary_dma_ops = { .unmap_sg = calgary_unmap_sg, .map_page = calgary_map_page, .unmap_page = calgary_unmap_page, + .mapping_error = calgary_mapping_error, }; static inline void __iomem * busno_to_bbar(unsigned char num) @@ -732,7 +740,7 @@ static void __init calgary_reserve_regions(struct pci_dev *dev) struct iommu_table *tbl = pci_iommu(dev->bus); /* reserve EMERGENCY_PAGES from bad_dma_address and up */ - iommu_range_reserve(tbl, DMA_ERROR_CODE, EMERGENCY_PAGES); + iommu_range_reserve(tbl, CALGARY_MAPPING_ERROR, EMERGENCY_PAGES); /* avoid the BIOS/VGA first 640KB-1MB region */ /* for CalIOC2 - avoid the entire first MB */