linux-kernel - [PATCH v1 1/9] memory: tegra: Provide facility for integration with the GART driver

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Date:   Tue,  8 May 2018 21:16:52 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Joerg Roedel <joro@...tes.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>
Cc:     linux-tegra@...r.kernel.org, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v1 1/9] memory: tegra: Provide facility for integration with the GART driver

In order to report clients name and access direction on GART page fault,
MC driver needs to access GART registers. Add facility that provides
access to the GART.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/memory/tegra/mc.c | 26 +++++++++++++++++++++++---
 include/soc/tegra/mc.h    | 13 +++++++++++++
 2 files changed, 36 insertions(+), 3 deletions(-)

diff --git a/drivers/memory/tegra/mc.c b/drivers/memory/tegra/mc.c
index c81d01caf1a8..49dd7ad1459f 100644
--- a/drivers/memory/tegra/mc.c
+++ b/drivers/memory/tegra/mc.c
@@ -72,6 +72,8 @@ static const struct of_device_id tegra_mc_of_match[] = {
 };
 MODULE_DEVICE_TABLE(of, tegra_mc_of_match);
 
+static struct tegra_mc_gart_handle *gart_handle;
+
 static int terga_mc_block_dma_common(struct tegra_mc *mc,
 				     const struct tegra_mc_reset *rst)
 {
@@ -543,6 +545,11 @@ static irqreturn_t tegra_mc_irq(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
+void tegra_mc_register_gart(struct tegra_mc_gart_handle *handle)
+{
+	WRITE_ONCE(gart_handle, handle);
+}
+
 static __maybe_unused irqreturn_t tegra20_mc_irq(int irq, void *data)
 {
 	struct tegra_mc *mc = data;
@@ -565,6 +572,7 @@ static __maybe_unused irqreturn_t tegra20_mc_irq(int irq, void *data)
 		switch (BIT(bit)) {
 		case MC_INT_DECERR_EMEM:
 			reg = MC_DECERR_EMEM_OTHERS_STATUS;
+			addr = mc_readl(mc, reg + sizeof(u32));
 			value = mc_readl(mc, reg);
 
 			id = value & mc->soc->client_id_mask;
@@ -575,11 +583,24 @@ static __maybe_unused irqreturn_t tegra20_mc_irq(int irq, void *data)
 			break;
 
 		case MC_INT_INVALID_GART_PAGE:
-			dev_err_ratelimited(mc->dev, "%s\n", error);
-			continue;
+			if (READ_ONCE(gart_handle) == NULL) {
+				dev_err_ratelimited(mc->dev, "%s\n", error);
+				continue;
+			}
+
+			addr = gart_handle->error_addr(gart_handle);
+			value = gart_handle->error_req(gart_handle);
+
+			id = (value >> 1) & mc->soc->client_id_mask;
+			desc = error_names[2];
+
+			if (value & BIT(0))
+				direction = "write";
+			break;
 
 		case MC_INT_SECURITY_VIOLATION:
 			reg = MC_SECURITY_VIOLATION_STATUS;
+			addr = mc_readl(mc, reg + sizeof(u32));
 			value = mc_readl(mc, reg);
 
 			id = value & mc->soc->client_id_mask;
@@ -596,7 +617,6 @@ static __maybe_unused irqreturn_t tegra20_mc_irq(int irq, void *data)
 		}
 
 		client = mc->soc->clients[id].name;
-		addr = mc_readl(mc, reg + sizeof(u32));
 
 		dev_err_ratelimited(mc->dev, "%s: %s%s @%pa: %s (%s)\n",
 				    client, secure, direction, &addr, error,
diff --git a/include/soc/tegra/mc.h b/include/soc/tegra/mc.h
index b43f37fea096..5bf72eb4dd51 100644
--- a/include/soc/tegra/mc.h
+++ b/include/soc/tegra/mc.h
@@ -162,4 +162,17 @@ struct tegra_mc {
 void tegra_mc_write_emem_configuration(struct tegra_mc *mc, unsigned long rate);
 unsigned int tegra_mc_get_emem_device_count(struct tegra_mc *mc);
 
+struct tegra_mc_gart_handle {
+	u32 (*error_addr)(struct tegra_mc_gart_handle *handle);
+	u32 (*error_req)(struct tegra_mc_gart_handle *handle);
+};
+
+#ifdef CONFIG_TEGRA_MC
+void tegra_mc_register_gart(struct tegra_mc_gart_handle *handle);
+#else
+static inline void tegra_mc_register_gart(struct tegra_mc_gart_handle *handle)
+{
+}
+#endif
+
 #endif /* __SOC_TEGRA_MC_H__ */
-- 
2.17.0