From: John Garry <john.garry@huawei.com>
To: <joro@8bytes.org>, <will@kernel.org>, <robin.murphy@arm.com>
Cc: iommu@lists.linux-foundation.org, linuxarm@huawei.com,
linux-kernel@vger.kernel.org
Subject: [PATCH v3 4/7] iova: Add iova_domain_len_is_cached()
Date: Tue, 1 Jun 2021 22:29:38 +0800 [thread overview]
Message-ID: <1622557781-211697-5-git-send-email-john.garry@huawei.com> (raw)
In-Reply-To: <1622557781-211697-1-git-send-email-john.garry@huawei.com>
Add a function to check whether an IOVA domain currently caches a given
upper IOVA len exactly.
Signed-off-by: John Garry <john.garry@huawei.com>
---
drivers/iommu/iova.c | 11 +++++++++++
include/linux/iova.h | 8 +++++++-
2 files changed, 18 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/iova.c b/drivers/iommu/iova.c
index 0e4c0e55178a..95892a0433cc 100644
--- a/drivers/iommu/iova.c
+++ b/drivers/iommu/iova.c
@@ -872,6 +872,17 @@ static void iova_magazine_push(struct iova_magazine *mag, unsigned long pfn)
mag->pfns[mag->size++] = pfn;
}
+static unsigned long iova_len_to_rcache_max(unsigned long iova_len)
+{
+ return order_base_2(iova_len) + 1;
+}
+
+/* Test if iova_len range cached upper limit matches that of IOVA domain */
+bool iova_domain_len_is_cached(struct iova_domain *iovad, unsigned long iova_len)
+{
+ return iova_len_to_rcache_max(iova_len) == iovad->rcache_max_size;
+}
+
static void init_iova_rcaches(struct iova_domain *iovad)
{
struct iova_cpu_rcache *cpu_rcache;
diff --git a/include/linux/iova.h b/include/linux/iova.h
index 9974e1d3e2bc..04cc8eb6de38 100644
--- a/include/linux/iova.h
+++ b/include/linux/iova.h
@@ -136,7 +136,8 @@ static inline unsigned long iova_pfn(struct iova_domain *iovad, dma_addr_t iova)
#if IS_ENABLED(CONFIG_IOMMU_IOVA)
int iova_cache_get(void);
void iova_cache_put(void);
-
+bool iova_domain_len_is_cached(struct iova_domain *iovad,
+ unsigned long iova_len);
void free_iova(struct iova_domain *iovad, unsigned long pfn);
void __free_iova(struct iova_domain *iovad, struct iova *iova);
struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size,
@@ -158,6 +159,11 @@ int init_iova_flush_queue(struct iova_domain *iovad,
struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
void put_iova_domain(struct iova_domain *iovad);
#else
+static inline bool iova_domain_len_is_cached(struct iova_domain *iovad,
+ unsigned long iova_len)
+{
+ return false;
+}
static inline int iova_cache_get(void)
{
return -ENOTSUPP;
--
2.26.2
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next prev parent reply other threads:[~2021-06-01 14:34 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-01 14:29 [PATCH v3 0/7] iommu: Allow IOVA rcache range be configured John Garry
2021-06-01 14:29 ` [PATCH v3 1/7] iommu: Reactor iommu_group_store_type() John Garry
2021-06-01 14:29 ` [PATCH v3 2/7] iova: Allow rcache range upper limit to be flexible John Garry
2021-06-01 14:29 ` [PATCH v3 3/7] iommu: Allow iommu_change_dev_def_domain() realloc default domain for same type John Garry
2021-06-01 14:29 ` John Garry [this message]
2021-06-01 14:29 ` [PATCH v3 5/7] iova: Add init_iova_domain_ext() John Garry
2021-06-01 14:29 ` [PATCH v3 6/7] iommu: Allow max opt DMA len be set for a group via sysfs John Garry
2021-06-01 14:29 ` [PATCH v3 7/7] dma-iommu: Use init_iova_domain_ext() for IOVA domain init John Garry
2021-06-02 4:37 ` [PATCH v3 0/7] iommu: Allow IOVA rcache range be configured Lu Baolu
2021-06-02 7:48 ` John Garry
2021-06-03 0:39 ` Lu Baolu
2021-06-03 8:00 ` John Garry
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