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2023-11-23 7d07b3ae8ddad407913c5301877e694430a3263f

 kernel/arch/powerpc/platforms/pseries/iommu.c
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@@ -38,6 +38,7 @@
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 #include <linux/of.h>
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 #include <linux/iommu.h>
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 #include <linux/rculist.h>
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+#include <linux/locallock.h>
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 #include <asm/io.h>
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 #include <asm/prom.h>
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 #include <asm/rtas.h>
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@@ -212,6 +213,7 @@
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 }
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 static DEFINE_PER_CPU(__be64 *, tce_page);
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+static DEFINE_LOCAL_IRQ_LOCK(tcp_page_lock);
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 static int tce_buildmulti_pSeriesLP(struct iommu_table *tbl, long tcenum,
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 				     long npages, unsigned long uaddr,
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@@ -233,7 +235,8 @@
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 		                           direction, attrs);
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 	}
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-	local_irq_save(flags);	/* to protect tcep and the page behind it */
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+	/* to protect tcep and the page behind it */
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+	local_lock_irqsave(tcp_page_lock, flags);
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 	tcep = __this_cpu_read(tce_page);
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@@ -244,7 +247,7 @@
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 		tcep = (__be64 *)__get_free_page(GFP_ATOMIC);
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 		/* If allocation fails, fall back to the loop implementation */
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 		if (!tcep) {
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-			local_irq_restore(flags);
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+			local_unlock_irqrestore(tcp_page_lock, flags);
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 			return tce_build_pSeriesLP(tbl->it_index, tcenum,
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 					tbl->it_page_shift,
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 					npages, uaddr, direction, attrs);
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@@ -279,7 +282,7 @@
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 		tcenum += limit;
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 	} while (npages > 0 && !rc);
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-	local_irq_restore(flags);
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+	local_unlock_irqrestore(tcp_page_lock, flags);
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 	if (unlikely(rc == H_NOT_ENOUGH_RESOURCES)) {
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 		ret = (int)rc;
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@@ -450,13 +453,14 @@
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 				DMA_BIDIRECTIONAL, 0);
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 	}
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-	local_irq_disable();	/* to protect tcep and the page behind it */
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+	/* to protect tcep and the page behind it */
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+	local_lock_irq(tcp_page_lock);
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 	tcep = __this_cpu_read(tce_page);
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 	if (!tcep) {
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 		tcep = (__be64 *)__get_free_page(GFP_ATOMIC);
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 		if (!tcep) {
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-			local_irq_enable();
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+			local_unlock_irq(tcp_page_lock);
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 			return -ENOMEM;
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 		}
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 		__this_cpu_write(tce_page, tcep);
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@@ -502,7 +506,7 @@
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 	/* error cleanup: caller will clear whole range */
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-	local_irq_enable();
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+	local_unlock_irq(tcp_page_lock);
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 	return rc;
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 }
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