linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Magnus Damm <magnus.damm@gmail.com>
To: iommu@lists.linux-foundation.org
Cc: laurent.pinchart+renesas@ideasonboard.com,
	geert+renesas@glider.be, joro@8bytes.org,
	linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
	horms+renesas@verge.net.au, Magnus Damm <magnus.damm@gmail.com>,
	robin.murphy@arm.com, m.szyprowski@samsung.com
Subject: [PATCH v4 05/07] iommu/ipmmu-vmsa: Add new IOMMU_DOMAIN_DMA ops
Date: Wed, 08 Jun 2016 16:18:25 +0900	[thread overview]
Message-ID: <20160608071825.7560.72273.sendpatchset@little-apple> (raw)
In-Reply-To: <20160608071737.7560.32571.sendpatchset@little-apple>

From: Magnus Damm <damm+renesas@opensource.se>

Introduce an alternative set of iommu_ops suitable for 64-bit ARM
as well as 32-bit ARM when CONFIG_IOMMU_DMA=y.

Signed-off-by: Magnus Damm <damm+renesas@opensource.se>
---

 Changes since V3:
 - Removed group parameter from ipmmu_init_platform_device()

 Changes since V2:
 - Included this new patch from the following series:
   [PATCH 00/04] iommu/ipmmu-vmsa: IPMMU CONFIG_IOMMU_DMA update
 - Use only a single iommu_ops structure with #ifdef CONFIG_IOMMU_DMA
 - Folded in #ifdefs to handle CONFIG_ARM and CONFIG_IOMMU_DMA
 - of_xlate() is now used without #ifdefs
 - Made sure code compiles on both 32-bit and 64-bit ARM.

 drivers/iommu/ipmmu-vmsa.c |  111 ++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 103 insertions(+), 8 deletions(-)

--- 0008/drivers/iommu/ipmmu-vmsa.c
+++ work/drivers/iommu/ipmmu-vmsa.c	2016-06-08 15:08:39.950607110 +0900
@@ -10,6 +10,7 @@
 
 #include <linux/bitmap.h>
 #include <linux/delay.h>
+#include <linux/dma-iommu.h>
 #include <linux/dma-mapping.h>
 #include <linux/err.h>
 #include <linux/export.h>
@@ -22,8 +23,10 @@
 #include <linux/sizes.h>
 #include <linux/slab.h>
 
+#if defined(CONFIG_ARM) && !defined(CONFIG_IOMMU_DMA)
 #include <asm/dma-iommu.h>
 #include <asm/pgalloc.h>
+#endif
 
 #include "io-pgtable.h"
 
@@ -520,14 +523,6 @@ static struct iommu_domain *__ipmmu_doma
 	return &domain->io_domain;
 }
 
-static struct iommu_domain *ipmmu_domain_alloc(unsigned type)
-{
-	if (type != IOMMU_DOMAIN_UNMANAGED)
-		return NULL;
-
-	return __ipmmu_domain_alloc(type);
-}
-
 static void ipmmu_domain_free(struct iommu_domain *io_domain)
 {
 	struct ipmmu_vmsa_domain *domain = to_vmsa_domain(io_domain);
@@ -714,6 +709,8 @@ error:
 	return ret;
 }
 
+#if defined(CONFIG_ARM) && !defined(CONFIG_IOMMU_DMA)
+
 static int ipmmu_add_device(struct device *dev)
 {
 	struct ipmmu_vmsa_archdata *archdata;
@@ -807,6 +804,14 @@ static void ipmmu_remove_device(struct d
 	dev->archdata.iommu = NULL;
 }
 
+static struct iommu_domain *ipmmu_domain_alloc(unsigned type)
+{
+	if (type != IOMMU_DOMAIN_UNMANAGED)
+		return NULL;
+
+	return __ipmmu_domain_alloc(type);
+}
+
 static const struct iommu_ops ipmmu_ops = {
 	.domain_alloc = ipmmu_domain_alloc,
 	.domain_free = ipmmu_domain_free,
@@ -821,6 +826,94 @@ static const struct iommu_ops ipmmu_ops
 	.pgsize_bitmap = SZ_1G | SZ_2M | SZ_4K,
 };
 
+#endif /* !CONFIG_ARM && CONFIG_IOMMU_DMA */
+
+#ifdef CONFIG_IOMMU_DMA
+
+static struct iommu_domain *ipmmu_domain_alloc_dma(unsigned type)
+{
+	struct iommu_domain *io_domain;
+
+	if (type != IOMMU_DOMAIN_DMA)
+		return NULL;
+
+	io_domain = __ipmmu_domain_alloc(type);
+	if (io_domain)
+		iommu_get_dma_cookie(io_domain);
+
+	return io_domain;
+}
+
+static void ipmmu_domain_free_dma(struct iommu_domain *io_domain)
+{
+	iommu_put_dma_cookie(io_domain);
+	ipmmu_domain_free(io_domain);
+}
+
+static int ipmmu_add_device_dma(struct device *dev)
+{
+	struct iommu_group *group;
+
+	/* only accept devices with iommus property */
+	if (of_count_phandle_with_args(dev->of_node, "iommus",
+				       "#iommu-cells") < 0)
+		return -ENODEV;
+
+	group = iommu_group_get_for_dev(dev);
+	if (IS_ERR(group))
+		return PTR_ERR(group);
+
+	return 0;
+}
+
+static void ipmmu_remove_device_dma(struct device *dev)
+{
+	iommu_group_remove_device(dev);
+}
+
+static struct iommu_group *ipmmu_device_group_dma(struct device *dev)
+{
+	struct iommu_group *group;
+	int ret;
+
+	group = generic_device_group(dev);
+	if (IS_ERR(group))
+		return group;
+
+	ret = ipmmu_init_platform_device(dev);
+	if (ret) {
+		iommu_group_put(group);
+		group = ERR_PTR(ret);
+	}
+
+	return group;
+}
+
+static int ipmmu_of_xlate_dma(struct device *dev,
+			      struct of_phandle_args *spec)
+{
+	/* dummy callback to satisfy of_iommu_configure() */
+	return 0;
+}
+
+static const struct iommu_ops ipmmu_ops = {
+	.domain_alloc = ipmmu_domain_alloc_dma,
+	.domain_free = ipmmu_domain_free_dma,
+	.attach_dev = ipmmu_attach_device,
+	.detach_dev = ipmmu_detach_device,
+	.map = ipmmu_map,
+	.unmap = ipmmu_unmap,
+	.map_sg = default_iommu_map_sg,
+	.iova_to_phys = ipmmu_iova_to_phys,
+	.add_device = ipmmu_add_device_dma,
+	.remove_device = ipmmu_remove_device_dma,
+	.device_group = ipmmu_device_group_dma,
+	.pgsize_bitmap = SZ_1G | SZ_2M | SZ_4K,
+	.of_xlate = ipmmu_of_xlate_dma,
+};
+
+#endif /* CONFIG_IOMMU_DMA */
+
 /* -----------------------------------------------------------------------------
  * Probe/remove and init
  */
@@ -910,7 +1003,9 @@ static int ipmmu_remove(struct platform_
 	list_del(&mmu->list);
 	spin_unlock(&ipmmu_devices_lock);
 
+#if defined(CONFIG_ARM) && !defined(CONFIG_IOMMU_DMA)
 	arm_iommu_release_mapping(mmu->mapping);
+#endif
 
 	ipmmu_device_reset(mmu);
 

  parent reply	other threads:[~2016-06-08  7:28 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-08  7:17 [PATCH v4 00/07] iommu/ipmmu-vmsa: IPMMU multi-arch update V4 Magnus Damm
2016-06-08  7:17 ` [PATCH v4 01/07] iommu/ipmmu-vmsa: Remove platform data handling Magnus Damm
2016-06-08  7:17 ` [PATCH v4 02/07] iommu/ipmmu-vmsa: Rework interrupt code and use bitmap for context Magnus Damm
2016-06-08  7:18 ` [PATCH v4 03/07] iommu/ipmmu-vmsa: Break out utlb parsing code Magnus Damm
2016-06-08  7:18 ` [PATCH v4 04/07] iommu/ipmmu-vmsa: Break out domain allocation code Magnus Damm
2016-06-08  7:18 ` Magnus Damm [this message]
2016-06-08  7:18 ` [PATCH v4 06/07] iommu/ipmmu-vmsa: ARM and ARM64 archdata access Magnus Damm
2016-06-08  7:18 ` [PATCH v4 07/07] iommu/ipmmu-vmsa: Drop LPAE Kconfig dependency Magnus Damm
2016-06-10  6:55 ` [PATCH v4 00/07] iommu/ipmmu-vmsa: IPMMU multi-arch update V4 Geert Uytterhoeven

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=20160608071825.7560.72273.sendpatchset@little-apple \
    --to=magnus.damm@gmail.com \
    --cc=geert+renesas@glider.be \
    --cc=horms+renesas@verge.net.au \
    --cc=iommu@lists.linux-foundation.org \
    --cc=joro@8bytes.org \
    --cc=laurent.pinchart+renesas@ideasonboard.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-renesas-soc@vger.kernel.org \
    --cc=m.szyprowski@samsung.com \
    --cc=robin.murphy@arm.com \
    --subject='Re: [PATCH v4 05/07] iommu/ipmmu-vmsa: Add new IOMMU_DOMAIN_DMA ops' \
    /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

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).