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Groups > linux.kernel > #1595059

[PATCH v3 08/09] iommu/ipmmu-vmsa: Allow two bit SL0

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

Introduce support for two bit SL0 bitfield in IMTTBCR
by using a separate feature flag.

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

 Changes since V2:
 - None

 Changes since V1:
 - None

 drivers/iommu/ipmmu-vmsa.c |   15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

--- 0022/drivers/iommu/ipmmu-vmsa.c
+++ work/drivers/iommu/ipmmu-vmsa.c	2017-03-08 18:33:07.630607110 +0900
@@ -38,6 +38,7 @@ struct ipmmu_features {
 	bool has_cache_leaf_nodes;
 	bool has_eight_ctx;
 	bool setup_imbuscr;
+	bool twobit_imttbcr_sl0;
 };
 
 struct ipmmu_vmsa_device {
@@ -163,6 +164,10 @@ static void set_archdata(struct device *
 #define IMTTBCR_TSZ0_MASK		(7 << 0)
 #define IMTTBCR_TSZ0_SHIFT		O
 
+#define IMTTBCR_SL0_TWOBIT_LVL_3	(0 << 6)
+#define IMTTBCR_SL0_TWOBIT_LVL_2	(1 << 6)
+#define IMTTBCR_SL0_TWOBIT_LVL_1	(2 << 6)
+
 #define IMBUSCR				0x000c
 #define IMBUSCR_DVM			(1 << 2)
 #define IMBUSCR_BUSSEL_SYS		(0 << 0)
@@ -406,6 +411,7 @@ static int ipmmu_domain_allocate_context
 static int ipmmu_domain_init_context(struct ipmmu_vmsa_domain *domain)
 {
 	u64 ttbr;
+	u32 tmp;
 	int ret;
 
 	/*
@@ -458,9 +464,15 @@ static int ipmmu_domain_init_context(str
 	 * We use long descriptors with inner-shareable WBWA tables and allocate
 	 * the whole 32-bit VA space to TTBR0.
 	 */
+
+	if (domain->root->features->twobit_imttbcr_sl0)
+		tmp = IMTTBCR_SL0_TWOBIT_LVL_1;
+	else
+		tmp = IMTTBCR_SL0_LVL_1;
+
 	ipmmu_ctx_write(domain, IMTTBCR, IMTTBCR_EAE |
 			IMTTBCR_SH0_INNER_SHAREABLE | IMTTBCR_ORGN0_WB_WA |
-			IMTTBCR_IRGN0_WB_WA | IMTTBCR_SL0_LVL_1);
+			IMTTBCR_IRGN0_WB_WA | tmp);
 
 	/* MAIR0 */
 	ipmmu_ctx_write(domain, IMMAIR0, domain->cfg.arm_lpae_s1_cfg.mair[0]);
@@ -1080,6 +1092,7 @@ static const struct ipmmu_features ipmmu
 	.has_cache_leaf_nodes = false,
 	.has_eight_ctx = false,
 	.setup_imbuscr = true,
+	.twobit_imttbcr_sl0 = false,
 };
 
 static const struct of_device_id ipmmu_of_ids[] = {

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[PATCH v3 00/09] iommu/ipmmu-vmsa: r8a7795 support V3 Magnus Damm <magnus.damm@gmail.com> - 2017-03-08 12:10 +0100
  [PATCH v3 01/09] iommu/ipmmu-vmsa: Introduce features, break out alias Magnus Damm <magnus.damm@gmail.com> - 2017-03-08 12:10 +0100
    Re: [PATCH v3 01/09] iommu/ipmmu-vmsa: Introduce features, break out  alias Robin Murphy <robin.murphy@arm.com> - 2017-03-08 13:30 +0100
      Re: [PATCH v3 01/09] iommu/ipmmu-vmsa: Introduce features, break out alias Magnus Damm <magnus.damm@gmail.com> - 2017-03-09 05:30 +0100
  [PATCH v3 08/09] iommu/ipmmu-vmsa: Allow two bit SL0 Magnus Damm <magnus.damm@gmail.com> - 2017-03-08 12:20 +0100
  [PATCH v3 07/09] iommu/ipmmu-vmsa: Make IMBUSCTR setup optional Magnus Damm <magnus.damm@gmail.com> - 2017-03-08 12:20 +0100
  [PATCH v3 03/09] iommu/ipmmu-vmsa: Enable multi context support Magnus Damm <magnus.damm@gmail.com> - 2017-03-08 12:20 +0100
    Re: [PATCH v3 03/09] iommu/ipmmu-vmsa: Enable multi context support Robin Murphy <robin.murphy@arm.com> - 2017-03-08 14:10 +0100
      Re: [PATCH v3 03/09] iommu/ipmmu-vmsa: Enable multi context support Magnus Damm <magnus.damm@gmail.com> - 2017-03-09 05:20 +0100
  [PATCH v3 06/09] iommu/ipmmu-vmsa: Write IMCTR twice Magnus Damm <magnus.damm@gmail.com> - 2017-03-08 12:20 +0100
    Re: [PATCH v3 06/09] iommu/ipmmu-vmsa: Write IMCTR twice Robin Murphy <robin.murphy@arm.com> - 2017-03-08 13:40 +0100
      Re: [PATCH v3 06/09] iommu/ipmmu-vmsa: Write IMCTR twice Magnus Damm <magnus.damm@gmail.com> - 2017-03-09 05:00 +0100
  [PATCH v3 09/09] iommu/ipmmu-vmsa: Hook up r8a7795 DT matching code Magnus Damm <magnus.damm@gmail.com> - 2017-03-08 12:20 +0100
    Re: [PATCH v3 09/09] iommu/ipmmu-vmsa: Hook up r8a7795 DT matching code Geert Uytterhoeven <geert@linux-m68k.org> - 2017-03-08 15:10 +0100
      Re: [PATCH v3 09/09] iommu/ipmmu-vmsa: Hook up r8a7795 DT matching code Magnus Damm <magnus.damm@gmail.com> - 2017-03-09 05:30 +0100
  [PATCH v3 04/09] iommu/ipmmu-vmsa: Make use of IOMMU_OF_DECLARE() Magnus Damm <magnus.damm@gmail.com> - 2017-03-08 12:40 +0100
    Re: [PATCH v3 04/09] iommu/ipmmu-vmsa: Make use of IOMMU_OF_DECLARE() Geert Uytterhoeven <geert@linux-m68k.org> - 2017-03-08 15:00 +0100
      Re: [PATCH v3 04/09] iommu/ipmmu-vmsa: Make use of IOMMU_OF_DECLARE() Magnus Damm <magnus.damm@gmail.com> - 2017-03-09 05:00 +0100
  [PATCH v3 05/09] iommu/ipmmu-vmsa: IPMMU device is 40-bit bus master Magnus Damm <magnus.damm@gmail.com> - 2017-03-08 13:20 +0100

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