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
next prev parent reply other threads:[~2021-02-03 23:39 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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210203233709.19819-4-dongli.zhang@oracle.com \
--to=dongli.zhang@oracle.com \
--cc=adrian.hunter@intel.com \
--cc=airlied@linux.ie \
--cc=akpm@linux-foundation.org \
--cc=bauerman@linux.ibm.com \
--cc=benh@kernel.crashing.org \
--cc=bhelgaas@google.com \
--cc=boris.ostrovsky@oracle.com \
--cc=bp@alien8.de \
--cc=bskeggs@redhat.com \
--cc=chris@chris-wilson.co.uk \
--cc=daniel@ffwll.ch \
--cc=dri-devel@lists.freedesktop.org \
--cc=hch@lst.de \
--cc=hpa@zytor.com \
--cc=intel-gfx@lists.freedesktop.org \
--cc=iommu@lists.linux-foundation.org \
--cc=jani.nikula@linux.intel.com \
--cc=jgross@suse.com \
--cc=joe.jin@oracle.com \
--cc=joonas.lahtinen@linux.intel.com \
--cc=konrad.wilk@oracle.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mips@vger.kernel.org \
--cc=linux-mmc@vger.kernel.org \
--cc=linux-pci@vger.kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=m.szyprowski@samsung.com \
--cc=matthew.auld@intel.com \
--cc=mingo@kernel.org \
--cc=mingo@redhat.com \
--cc=mpe@ellerman.id.au \
--cc=nouveau@lists.freedesktop.org \
--cc=paulus@samba.org \
--cc=peterz@infradead.org \
--cc=robin.murphy@arm.com \
--cc=rodrigo.vivi@intel.com \
--cc=rppt@kernel.org \
--cc=sstabellini@kernel.org \
--cc=tglx@linutronix.de \
--cc=thomas.lendacky@amd.com \
--cc=tsbogend@alpha.franken.de \
--cc=ulf.hansson@linaro.org \
--cc=x86@kernel.org \
--cc=xen-devel@lists.xenproject.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).