From: Christoph Hellwig <hch@lst.de>
To: iommu@lists.linux-foundation.org
Cc: x86@kernel.org, Anshuman Khandual <anshuman.khandual@arm.com>,
Tom Lendacky <thomas.lendacky@amd.com>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Stefano Stabellini <sstabellini@kernel.org>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Juergen Gross <jgross@suse.com>, Joerg Roedel <joro@8bytes.org>,
David Woodhouse <dwmw2@infradead.org>,
Lu Baolu <baolu.lu@linux.intel.com>,
Robin Murphy <robin.murphy@arm.com>,
linux-arm-kernel@lists.infradead.org,
xen-devel@lists.xenproject.org, linux-ia64@vger.kernel.org,
linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org,
linux-hyperv@vger.kernel.org, tboot-devel@lists.sourceforge.net,
linux-pci@vger.kernel.org
Subject: [PATCH 10/15] swiotlb: add a SWIOTLB_ANY flag to lift the low memory restriction
Date: Mon, 14 Mar 2022 08:31:24 +0100 [thread overview]
Message-ID: <20220314073129.1862284-11-hch@lst.de> (raw)
In-Reply-To: <20220314073129.1862284-1-hch@lst.de>
Power SVM wants to allocate a swiotlb buffer that is not restricted to
low memory for the trusted hypervisor scheme. Consolidate the support
for this into the swiotlb_init interface by adding a new flag.
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
arch/powerpc/include/asm/svm.h | 4 ----
arch/powerpc/include/asm/swiotlb.h | 1 +
arch/powerpc/kernel/dma-swiotlb.c | 1 +
arch/powerpc/mm/mem.c | 5 +----
arch/powerpc/platforms/pseries/svm.c | 26 +-------------------------
include/linux/swiotlb.h | 1 +
kernel/dma/swiotlb.c | 11 +++++++++--
7 files changed, 14 insertions(+), 35 deletions(-)
diff --git a/arch/powerpc/include/asm/svm.h b/arch/powerpc/include/asm/svm.h
index 7546402d796af..85580b30aba48 100644
--- a/arch/powerpc/include/asm/svm.h
+++ b/arch/powerpc/include/asm/svm.h
@@ -15,8 +15,6 @@ static inline bool is_secure_guest(void)
return mfmsr() & MSR_S;
}
-void __init svm_swiotlb_init(void);
-
void dtl_cache_ctor(void *addr);
#define get_dtl_cache_ctor() (is_secure_guest() ? dtl_cache_ctor : NULL)
@@ -27,8 +25,6 @@ static inline bool is_secure_guest(void)
return false;
}
-static inline void svm_swiotlb_init(void) {}
-
#define get_dtl_cache_ctor() NULL
#endif /* CONFIG_PPC_SVM */
diff --git a/arch/powerpc/include/asm/swiotlb.h b/arch/powerpc/include/asm/swiotlb.h
index 3c1a1cd161286..4203b5e0a88ed 100644
--- a/arch/powerpc/include/asm/swiotlb.h
+++ b/arch/powerpc/include/asm/swiotlb.h
@@ -9,6 +9,7 @@
#include <linux/swiotlb.h>
extern unsigned int ppc_swiotlb_enable;
+extern unsigned int ppc_swiotlb_flags;
#ifdef CONFIG_SWIOTLB
void swiotlb_detect_4g(void);
diff --git a/arch/powerpc/kernel/dma-swiotlb.c b/arch/powerpc/kernel/dma-swiotlb.c
index fc7816126a401..ba256c37bcc0f 100644
--- a/arch/powerpc/kernel/dma-swiotlb.c
+++ b/arch/powerpc/kernel/dma-swiotlb.c
@@ -10,6 +10,7 @@
#include <asm/swiotlb.h>
unsigned int ppc_swiotlb_enable;
+unsigned int ppc_swiotlb_flags;
void __init swiotlb_detect_4g(void)
{
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index e1519e2edc656..a4d65418c30a9 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -249,10 +249,7 @@ void __init mem_init(void)
* back to to-down.
*/
memblock_set_bottom_up(true);
- if (is_secure_guest())
- svm_swiotlb_init();
- else
- swiotlb_init(ppc_swiotlb_enable, 0);
+ swiotlb_init(ppc_swiotlb_enable, ppc_swiotlb_flags);
#endif
high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
diff --git a/arch/powerpc/platforms/pseries/svm.c b/arch/powerpc/platforms/pseries/svm.c
index c5228f4969eb2..3b4045d508ec8 100644
--- a/arch/powerpc/platforms/pseries/svm.c
+++ b/arch/powerpc/platforms/pseries/svm.c
@@ -28,7 +28,7 @@ static int __init init_svm(void)
* need to use the SWIOTLB buffer for DMA even if dma_capable() says
* otherwise.
*/
- swiotlb_force = SWIOTLB_FORCE;
+ ppc_swiotlb_flags |= SWIOTLB_ANY | SWIOTLB_FORCE;
/* Share the SWIOTLB buffer with the host. */
swiotlb_update_mem_attributes();
@@ -37,30 +37,6 @@ static int __init init_svm(void)
}
machine_early_initcall(pseries, init_svm);
-/*
- * Initialize SWIOTLB. Essentially the same as swiotlb_init(), except that it
- * can allocate the buffer anywhere in memory. Since the hypervisor doesn't have
- * any addressing limitation, we don't need to allocate it in low addresses.
- */
-void __init svm_swiotlb_init(void)
-{
- unsigned char *vstart;
- unsigned long bytes, io_tlb_nslabs;
-
- io_tlb_nslabs = (swiotlb_size_or_default() >> IO_TLB_SHIFT);
- io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
-
- bytes = io_tlb_nslabs << IO_TLB_SHIFT;
-
- vstart = memblock_alloc(PAGE_ALIGN(bytes), PAGE_SIZE);
- if (vstart && !swiotlb_init_with_tbl(vstart, io_tlb_nslabs, false))
- return;
-
-
- memblock_free(vstart, PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT));
- panic("SVM: Cannot allocate SWIOTLB buffer");
-}
-
int set_memory_encrypted(unsigned long addr, int numpages)
{
if (!cc_platform_has(CC_ATTR_MEM_ENCRYPT))
diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
index ae0407173e845..eabdd89987027 100644
--- a/include/linux/swiotlb.h
+++ b/include/linux/swiotlb.h
@@ -15,6 +15,7 @@ struct scatterlist;
#define SWIOTLB_VERBOSE (1 << 0) /* verbose initialization */
#define SWIOTLB_FORCE (1 << 1) /* force bounce buffering */
+#define SWIOTLB_ANY (1 << 2) /* allow any memory for the buffer */
/*
* Maximum allowable number of contiguous slabs to map,
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index 5ac6e128d4279..2ad12562c94fe 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -266,8 +266,15 @@ void __init swiotlb_init(bool addressing_limit, unsigned int flags)
if (swiotlb_force_disable)
return;
- /* Get IO TLB memory from the low pages */
- tlb = memblock_alloc_low(bytes, PAGE_SIZE);
+ /*
+ * By default allocate the bounce buffer memory from low memory, but
+ * allow to pick a location everywhere for hypervisors with guest
+ * memory encryption.
+ */
+ if (flags & SWIOTLB_ANY)
+ tlb = memblock_alloc(bytes, PAGE_SIZE);
+ else
+ tlb = memblock_alloc_low(bytes, PAGE_SIZE);
if (!tlb)
goto fail;
if (swiotlb_init_with_tbl(tlb, default_nslabs, flags))
--
2.30.2
next prev parent reply other threads:[~2022-03-14 7:32 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-14 7:31 cleanup swiotlb initialization v5 Christoph Hellwig
2022-03-14 7:31 ` [PATCH 01/15] dma-direct: use is_swiotlb_active in dma_direct_map_page Christoph Hellwig
2022-03-14 7:31 ` [PATCH 02/15] swiotlb: make swiotlb_exit a no-op if SWIOTLB_FORCE is set Christoph Hellwig
2022-03-14 7:31 ` [PATCH 03/15] swiotlb: simplify swiotlb_max_segment Christoph Hellwig
2022-03-14 7:31 ` [PATCH 04/15] swiotlb: rename swiotlb_late_init_with_default_size Christoph Hellwig
2022-03-14 7:31 ` [PATCH 05/15] arm/xen: don't check for xen_initial_domain() in xen_create_contiguous_region Christoph Hellwig
2022-03-14 7:31 ` [PATCH 06/15] MIPS/octeon: use swiotlb_init instead of open coding it Christoph Hellwig
2022-03-14 7:31 ` [PATCH 07/15] x86: remove the IOMMU table infrastructure Christoph Hellwig
2022-03-14 7:31 ` [PATCH 08/15] x86: centralize setting SWIOTLB_FORCE when guest memory encryption is enabled Christoph Hellwig
2022-03-14 7:31 ` [PATCH 09/15] swiotlb: make the swiotlb_init interface more useful Christoph Hellwig
2022-03-14 7:31 ` Christoph Hellwig [this message]
2022-03-14 7:31 ` [PATCH 11/15] swiotlb: pass a gfp_mask argument to swiotlb_init_late Christoph Hellwig
2022-03-14 7:31 ` [PATCH 12/15] swiotlb: provide swiotlb_init variants that remap the buffer Christoph Hellwig
2022-03-14 22:39 ` Boris Ostrovsky
2022-03-15 6:36 ` Christoph Hellwig
2022-03-16 0:39 ` Boris Ostrovsky
2022-03-14 7:31 ` [PATCH 13/15] swiotlb: merge swiotlb-xen initialization into swiotlb Christoph Hellwig
2022-03-14 23:07 ` Boris Ostrovsky
2022-03-15 6:48 ` Christoph Hellwig
2022-03-15 0:00 ` Stefano Stabellini
2022-03-14 7:31 ` [PATCH 14/15] swiotlb: remove swiotlb_init_with_tbl and swiotlb_init_late_with_tbl Christoph Hellwig
2022-03-14 23:11 ` Boris Ostrovsky
2022-03-14 7:31 ` [PATCH 15/15] x86: remove cruft from <asm/dma-mapping.h> Christoph Hellwig
2022-04-04 5:05 cleanup swiotlb initialization v8 Christoph Hellwig
2022-04-04 5:05 ` [PATCH 10/15] swiotlb: add a SWIOTLB_ANY flag to lift the low memory restriction Christoph Hellwig
2022-04-07 0:25 ` Konrad Rzeszutek Wilk
2022-04-12 6:21 ` Christoph Hellwig
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