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[2607:7c80:54:e::133]) by mx.google.com with ESMTPS id j59si2483235plb.176.2019.06.13.02.43.49 for (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Thu, 13 Jun 2019 02:43:49 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of batv+aff2f865c54b6c032bcd+5772+infradead.org+hch@bombadil.srs.infradead.org designates 2607:7c80:54:e::133 as permitted sender) client-ip=2607:7c80:54:e::133; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=bombadil.20170209 header.b=QwHN3Ivc; spf=pass (google.com: best guess record for domain of batv+aff2f865c54b6c032bcd+5772+infradead.org+hch@bombadil.srs.infradead.org designates 2607:7c80:54:e::133 as permitted sender) smtp.mailfrom=BATV+aff2f865c54b6c032bcd+5772+infradead.org+hch@bombadil.srs.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From :Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=U+naUp6GJ2c/vfJkCwMO0IpliZVzAgQ1geAwtt/0bck=; b=QwHN3Ivc9/431JjZXwTTSF08rO hXrz9haLO+d9Q3IUHfpmJTWlt7YXy/NmVHDKKTD/S+hOE4Iu0sImh3ze2ah7uPgw3Ei9X4uKveyn/ nsmcYq0LFNlYJpg+2os1UWxfhf/0nIJoqy+Sw+YSOCSsLRjhEfzfdB5pljAfNGKYcC0tMcDPRgbPE fc5wdASA11vbKRHWzIsWFALeW2JqScCVdyapFn6VpyWwynpkuTmK8WBHg8NlvHxlGwpmm3SGTXN+Q yYignYCrY/T0XlMl97q/6sfhwXRxvc26NXzsHK9MeWjhS6x6hjc2xLbTs1LjAwLCYlTdNCmJxrgk4 fOpj7qYg==; Received: from mpp-cp1-natpool-1-198.ethz.ch ([82.130.71.198] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hbMGo-0001lZ-Cj; Thu, 13 Jun 2019 09:43:46 +0000 From: Christoph Hellwig To: Dan Williams , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Jason Gunthorpe , Ben Skeggs Cc: linux-mm@kvack.org, nouveau@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-nvdimm@lists.01.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 06/22] mm: factor out a devm_request_free_mem_region helper Date: Thu, 13 Jun 2019 11:43:09 +0200 Message-Id: <20190613094326.24093-7-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190613094326.24093-1-hch@lst.de> References: <20190613094326.24093-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: X-Virus-Scanned: ClamAV using ClamSMTP Keep the physical address allocation that hmm_add_device does with the rest of the resource code, and allow future reuse of it without the hmm wrapper. Signed-off-by: Christoph Hellwig Reviewed-by: Jason Gunthorpe Reviewed-by: John Hubbard --- include/linux/ioport.h | 2 ++ kernel/resource.c | 39 +++++++++++++++++++++++++++++++++++++++ mm/hmm.c | 33 ++++----------------------------- 3 files changed, 45 insertions(+), 29 deletions(-) diff --git a/include/linux/ioport.h b/include/linux/ioport.h index da0ebaec25f0..76a33ae3bf6c 100644 --- a/include/linux/ioport.h +++ b/include/linux/ioport.h @@ -286,6 +286,8 @@ static inline bool resource_overlaps(struct resource *r1, struct resource *r2) return (r1->start <= r2->end && r1->end >= r2->start); } +struct resource *devm_request_free_mem_region(struct device *dev, + struct resource *base, unsigned long size); #endif /* __ASSEMBLY__ */ #endif /* _LINUX_IOPORT_H */ diff --git a/kernel/resource.c b/kernel/resource.c index 158f04ec1d4f..99c58134ed1c 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -1628,6 +1628,45 @@ void resource_list_free(struct list_head *head) } EXPORT_SYMBOL(resource_list_free); +#ifdef CONFIG_DEVICE_PRIVATE +/** + * devm_request_free_mem_region - find free region for device private memory + * + * @dev: device struct to bind the resource too + * @size: size in bytes of the device memory to add + * @base: resource tree to look in + * + * This function tries to find an empty range of physical address big enough to + * contain the new resource, so that it can later be hotpluged as ZONE_DEVICE + * memory, which in turn allocates struct pages. + */ +struct resource *devm_request_free_mem_region(struct device *dev, + struct resource *base, unsigned long size) +{ + resource_size_t end, addr; + struct resource *res; + + size = ALIGN(size, 1UL << PA_SECTION_SHIFT); + end = min_t(unsigned long, base->end, (1UL << MAX_PHYSMEM_BITS) - 1); + addr = end - size + 1UL; + + for (; addr > size && addr >= base->start; addr -= size) { + if (region_intersects(addr, size, 0, IORES_DESC_NONE) != + REGION_DISJOINT) + continue; + + res = devm_request_mem_region(dev, addr, size, dev_name(dev)); + if (!res) + return ERR_PTR(-ENOMEM); + res->desc = IORES_DESC_DEVICE_PRIVATE_MEMORY; + return res; + } + + return ERR_PTR(-ERANGE); +} +EXPORT_SYMBOL_GPL(devm_request_free_mem_region); +#endif /* CONFIG_DEVICE_PRIVATE */ + static int __init strict_iomem(char *str) { if (strstr(str, "relaxed")) diff --git a/mm/hmm.c b/mm/hmm.c index e1dc98407e7b..13a16faf0a77 100644 --- a/mm/hmm.c +++ b/mm/hmm.c @@ -26,8 +26,6 @@ #include #include -#define PA_SECTION_SIZE (1UL << PA_SECTION_SHIFT) - #if IS_ENABLED(CONFIG_HMM_MIRROR) static const struct mmu_notifier_ops hmm_mmu_notifier_ops; @@ -1372,7 +1370,6 @@ struct hmm_devmem *hmm_devmem_add(const struct hmm_devmem_ops *ops, unsigned long size) { struct hmm_devmem *devmem; - resource_size_t addr; void *result; int ret; @@ -1398,32 +1395,10 @@ struct hmm_devmem *hmm_devmem_add(const struct hmm_devmem_ops *ops, if (ret) return ERR_PTR(ret); - size = ALIGN(size, PA_SECTION_SIZE); - addr = min((unsigned long)iomem_resource.end, - (1UL << MAX_PHYSMEM_BITS) - 1); - addr = addr - size + 1UL; - - /* - * FIXME add a new helper to quickly walk resource tree and find free - * range - * - * FIXME what about ioport_resource resource ? - */ - for (; addr > size && addr >= iomem_resource.start; addr -= size) { - ret = region_intersects(addr, size, 0, IORES_DESC_NONE); - if (ret != REGION_DISJOINT) - continue; - - devmem->resource = devm_request_mem_region(device, addr, size, - dev_name(device)); - if (!devmem->resource) - return ERR_PTR(-ENOMEM); - break; - } - if (!devmem->resource) - return ERR_PTR(-ERANGE); - - devmem->resource->desc = IORES_DESC_DEVICE_PRIVATE_MEMORY; + devmem->resource = devm_request_free_mem_region(device, &iomem_resource, + size); + if (IS_ERR(devmem->resource)) + return ERR_CAST(devmem->resource); devmem->pfn_first = devmem->resource->start >> PAGE_SHIFT; devmem->pfn_last = devmem->pfn_first + (resource_size(devmem->resource) >> PAGE_SHIFT);