linux-kernel - [PATCH] iommu/amd: Add prefetch iommu pages command build function

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Date:   Sun, 6 Sep 2020 09:18:08 +0800
From:   Wesley Sheng <wesley.sheng@....com>
To:     <joro@...tes.com>, <iommu@...ts.linux-foundation.org>,
        <linux-kernel@...r.kernel.org>
CC:     <wesleyshenggit@...a.com>, Wesley Sheng <wesley.sheng@....com>
Subject: [PATCH] iommu/amd: Add prefetch iommu pages command build function

Add function to build prefetch iommu pages command

Signed-off-by: Wesley Sheng <wesley.sheng@....com>
---
 drivers/iommu/amd/amd_iommu_types.h |  2 ++
 drivers/iommu/amd/iommu.c           | 19 +++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/drivers/iommu/amd/amd_iommu_types.h b/drivers/iommu/amd/amd_iommu_types.h
index baa31cd2411c..73734a0c4679 100644
--- a/drivers/iommu/amd/amd_iommu_types.h
+++ b/drivers/iommu/amd/amd_iommu_types.h
@@ -173,6 +173,7 @@
 #define CMD_INV_IOMMU_PAGES	0x03
 #define CMD_INV_IOTLB_PAGES	0x04
 #define CMD_INV_IRT		0x05
+#define CMD_PF_IOMMU_PAGES	0x06
 #define CMD_COMPLETE_PPR	0x07
 #define CMD_INV_ALL		0x08
 
@@ -181,6 +182,7 @@
 #define CMD_INV_IOMMU_PAGES_SIZE_MASK	0x01
 #define CMD_INV_IOMMU_PAGES_PDE_MASK	0x02
 #define CMD_INV_IOMMU_PAGES_GN_MASK	0x04
+#define CMD_PF_IOMMU_PAGES_INV_MASK	0x10
 
 #define PPR_STATUS_MASK			0xf
 #define PPR_STATUS_SHIFT		12
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index ba9f3dbc5b94..b3971595b0e9 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -976,6 +976,25 @@ static void build_inv_irt(struct iommu_cmd *cmd, u16 devid)
 	CMD_SET_TYPE(cmd, CMD_INV_IRT);
 }
 
+static void build_pf_iommu_pages(struct iommu_cmd *cmd, u64 address,
+					u16 devid, int pfcnt, bool size,
+					bool inv)
+{
+	memset(cmd, 0, sizeof(*cmd));
+
+	address &= PAGE_MASK;
+
+	cmd->data[0]  = devid;
+	cmd->data[0] |= (pfcnt & 0xff) << 24;
+	cmd->data[2]  = lower_32_bits(address);
+	cmd->data[3]  = upper_32_bits(address);
+	if (size)
+		cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK;
+	if (inv)
+		cmd->data[2] |= CMD_PF_IOMMU_PAGES_INV_MASK;
+	CMD_SET_TYPE(cmd, CMD_PF_IOMMU_PAGES);
+}
+
 /*
  * Writes the command to the IOMMUs command buffer and informs the
  * hardware about the new command.
-- 
2.16.2