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From: Dongli Zhang <dongli.zhang@oracle.com>
To: dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org,
	iommu@lists.linux-foundation.org, linux-mips@vger.kernel.org,
	linux-mmc@vger.kernel.org, linux-pci@vger.kernel.org,
	linuxppc-dev@lists.ozlabs.org, nouveau@lists.freedesktop.org,
	x86@kernel.org, xen-devel@lists.xenproject.org
Cc: linux-kernel@vger.kernel.org, adrian.hunter@intel.com,
	akpm@linux-foundation.org, benh@kernel.crashing.org,
	bskeggs@redhat.com, bhelgaas@google.com, bp@alien8.de,
	boris.ostrovsky@oracle.com, hch@lst.de, chris@chris-wilson.co.uk,
	daniel@ffwll.ch, airlied@linux.ie, hpa@zytor.com,
	mingo@kernel.org, mingo@redhat.com, jani.nikula@linux.intel.com,
	joonas.lahtinen@linux.intel.com, jgross@suse.com,
	konrad.wilk@oracle.com, m.szyprowski@samsung.com,
	matthew.auld@intel.com, mpe@ellerman.id.au, rppt@kernel.org,
	paulus@samba.org, peterz@infradead.org, robin.murphy@arm.com,
	rodrigo.vivi@intel.com, sstabellini@kernel.org,
	bauerman@linux.ibm.com, tsbogend@alpha.franken.de,
	tglx@linutronix.de, ulf.hansson@linaro.org, joe.jin@oracle.com,
	thomas.lendacky@amd.com
Subject: [PATCH RFC v1 3/6] swiotlb: introduce swiotlb_get_type() to calculate swiotlb buffer type
Date: Wed,  3 Feb 2021 15:37:06 -0800	[thread overview]
Message-ID: <20210203233709.19819-4-dongli.zhang@oracle.com> (raw)
In-Reply-To: <20210203233709.19819-1-dongli.zhang@oracle.com>

This patch introduces swiotlb_get_type() in order to calculate which
swiotlb buffer the given DMA address is belong to.

This is to prepare to enable 64-bit swiotlb.

Cc: Joe Jin <joe.jin@oracle.com>
Signed-off-by: Dongli Zhang <dongli.zhang@oracle.com>
---
 include/linux/swiotlb.h | 14 ++++++++++++++
 kernel/dma/swiotlb.c    |  2 ++
 2 files changed, 16 insertions(+)

diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index 777046cd4d1b..3d5980d77810 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -3,6 +3,7 @@
 #define __LINUX_SWIOTLB_H
 
 #include <linux/dma-direction.h>
+#include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/types.h>
 #include <linux/limits.h>
@@ -23,6 +24,8 @@ enum swiotlb_t {
 	SWIOTLB_MAX,
 };
 
+extern int swiotlb_nr;
+
 /*
  * Maximum allowable number of contiguous slabs to map,
  * must be a power of 2.  What is the appropriate value ?
@@ -84,6 +87,17 @@ static inline bool is_swiotlb_buffer(phys_addr_t paddr)
 	       paddr < io_tlb_end[SWIOTLB_LO];
 }
 
+static inline int swiotlb_get_type(phys_addr_t paddr)
+{
+	int i;
+
+	for (i = 0; i < swiotlb_nr; i++)
+		if (paddr >= io_tlb_start[i] && paddr < io_tlb_end[i])
+			return i;
+
+	return -ENOENT;
+}
+
 void __init swiotlb_exit(void);
 unsigned int swiotlb_max_segment(void);
 size_t swiotlb_max_mapping_size(struct device *dev);
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index 1fbb65daa2dd..c91d3d2c3936 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -109,6 +109,8 @@ static DEFINE_SPINLOCK(io_tlb_lock);
 
 static int late_alloc;
 
+int swiotlb_nr = 1;
+
 static int __init
 setup_io_tlb_npages(char *str)
 {
-- 
2.17.1


  parent reply	other threads:[~2021-02-03 23:40 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-03 23:37 [PATCH RFC v1 0/6] swiotlb: 64-bit DMA buffer Dongli Zhang
2021-02-03 23:37 ` [PATCH RFC v1 1/6] swiotlb: define new enumerated type Dongli Zhang
2021-02-03 23:37 ` [PATCH RFC v1 2/6] swiotlb: convert variables to arrays Dongli Zhang
2021-02-04  7:29   ` Christoph Hellwig
2021-02-04 11:49     ` Robin Murphy
2021-02-04 19:31       ` Konrad Rzeszutek Wilk
2021-02-03 23:37 ` Dongli Zhang [this message]
2021-02-03 23:37 ` [PATCH RFC v1 4/6] swiotlb: enable 64-bit swiotlb Dongli Zhang
2021-02-03 23:37 ` [PATCH RFC v1 5/6] xen-swiotlb: convert variables to arrays Dongli Zhang
2021-02-04  8:40   ` Christoph Hellwig
2021-02-07 15:56     ` Christoph Hellwig
2021-02-19 20:32       ` Konrad Rzeszutek Wilk
2021-02-19 23:59         ` Boris Ostrovsky
2021-02-23  1:22         ` Stefano Stabellini
2021-02-03 23:37 ` [PATCH RFC v1 6/6] xen-swiotlb: enable 64-bit xen-swiotlb Dongli Zhang

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