Date:   Sun, 09 Feb 2020 14:02:37 -0000
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org
Subject: [GIT pull] interrupt fixes for 5.6-rc1

Linus,

please pull the latest irq/urgent branch from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git irq-urgent-2020-02-09

up to:  2f86e45a7f42: Merge tag 'irqchip-fixes-5.6-1' of git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms into irq/urgent


A set of fixes for the interrupt subsystem:

 - Provision only ACPI enabled redistributors on GICv3

 - Use the proper command colums when building the INVALL command for the
   GICv3-ITS

 - Ensure the allocation of the L2 vPE table for GICv4.1

 - Correct the GICv4.1 VPROBASER programming so it uses the proper size

 - A set of small GICv4.1 tidy up patches

 - Configuration cleanup for C-SKY interrupt chip

 - Clarify the function documentation for irq_set_wake() to document that
   the wakeup functionality is orthogonal to the irq disable/enable
   mechanism.

Thanks,

	tglx

------------------>
Marc Zyngier (1):
      irqchip/gic-v3: Only provision redistributors that are enabled in ACPI

Randy Dunlap (1):
      irqchip: Some Kconfig cleanup for C-SKY

Stephen Boyd (1):
      genirq: Clarify that irq wake state is orthogonal to enable/disable

Zenghui Yu (7):
      irqchip/gic-v3-its: Reference to its_invall_cmd descriptor when building INVALL
      irqchip/gic-v4.1: Fix programming of GICR_VPROPBASER_4_1_SIZE
      irqchip/gic-v4.1: Set vpe_l1_base for all redistributors
      irqchip/gic-v4.1: Ensure L2 vPE table is allocated at RD level
      irqchip/gic-v4.1: Drop 'tmp' in inherit_vpe_l1_table_from_rd()
      irqchip/gic-v3-its: Remove superfluous WARN_ON
      irqchip/gic-v3-its: Rename VPENDBASER/VPROPBASER accessors


 arch/arm/include/asm/arch_gicv3.h   |  12 ++--
 arch/arm64/include/asm/arch_gicv3.h |   8 +--
 drivers/irqchip/Kconfig             |   4 +-
 drivers/irqchip/irq-gic-v3-its.c    | 120 ++++++++++++++++++++++++++++++------
 drivers/irqchip/irq-gic-v3.c        |   9 ++-
 include/linux/irqchip/arm-gic-v3.h  |   2 +-
 kernel/irq/manage.c                 |   7 +++
 7 files changed, 127 insertions(+), 35 deletions(-)

diff --git a/arch/arm/include/asm/arch_gicv3.h b/arch/arm/include/asm/arch_gicv3.h
index b5752f0e8936..c815477b4303 100644
--- a/arch/arm/include/asm/arch_gicv3.h
+++ b/arch/arm/include/asm/arch_gicv3.h
@@ -326,16 +326,16 @@ static inline u64 __gic_readq_nonatomic(const volatile void __iomem *addr)
 #define gits_write_cwriter(v, c)	__gic_writeq_nonatomic(v, c)
 
 /*
- * GITS_VPROPBASER - hi and lo bits may be accessed independently.
+ * GICR_VPROPBASER - hi and lo bits may be accessed independently.
  */
-#define gits_read_vpropbaser(c)		__gic_readq_nonatomic(c)
-#define gits_write_vpropbaser(v, c)	__gic_writeq_nonatomic(v, c)
+#define gicr_read_vpropbaser(c)		__gic_readq_nonatomic(c)
+#define gicr_write_vpropbaser(v, c)	__gic_writeq_nonatomic(v, c)
 
 /*
- * GITS_VPENDBASER - the Valid bit must be cleared before changing
+ * GICR_VPENDBASER - the Valid bit must be cleared before changing
  * anything else.
  */
-static inline void gits_write_vpendbaser(u64 val, void __iomem *addr)
+static inline void gicr_write_vpendbaser(u64 val, void __iomem *addr)
 {
 	u32 tmp;
 
@@ -352,7 +352,7 @@ static inline void gits_write_vpendbaser(u64 val, void __iomem *addr)
 	__gic_writeq_nonatomic(val, addr);
 }
 
-#define gits_read_vpendbaser(c)		__gic_readq_nonatomic(c)
+#define gicr_read_vpendbaser(c)		__gic_readq_nonatomic(c)
 
 static inline bool gic_prio_masking_enabled(void)
 {
diff --git a/arch/arm64/include/asm/arch_gicv3.h b/arch/arm64/include/asm/arch_gicv3.h
index 4750fc8030c3..25fec4bde43a 100644
--- a/arch/arm64/include/asm/arch_gicv3.h
+++ b/arch/arm64/include/asm/arch_gicv3.h
@@ -140,11 +140,11 @@ static inline u32 gic_read_rpr(void)
 #define gicr_write_pendbaser(v, c)	writeq_relaxed(v, c)
 #define gicr_read_pendbaser(c)		readq_relaxed(c)
 
-#define gits_write_vpropbaser(v, c)	writeq_relaxed(v, c)
-#define gits_read_vpropbaser(c)		readq_relaxed(c)
+#define gicr_write_vpropbaser(v, c)	writeq_relaxed(v, c)
+#define gicr_read_vpropbaser(c)		readq_relaxed(c)
 
-#define gits_write_vpendbaser(v, c)	writeq_relaxed(v, c)
-#define gits_read_vpendbaser(c)		readq_relaxed(c)
+#define gicr_write_vpendbaser(v, c)	writeq_relaxed(v, c)
+#define gicr_read_vpendbaser(c)		readq_relaxed(c)
 
 static inline bool gic_prio_masking_enabled(void)
 {
diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index 1006c694d9fb..6d397732138d 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -438,7 +438,7 @@ config CSKY_MPINTC
 	help
 	  Say yes here to enable C-SKY SMP interrupt controller driver used
 	  for C-SKY SMP system.
-	  In fact it's not mmio map in hw and it use ld/st to visit the
+	  In fact it's not mmio map in hardware and it uses ld/st to visit the
 	  controller's register inside CPU.
 
 config CSKY_APB_INTC
@@ -446,7 +446,7 @@ config CSKY_APB_INTC
 	depends on CSKY
 	help
 	  Say yes here to enable C-SKY APB interrupt controller driver used
-	  by C-SKY single core SOC system. It use mmio map apb-bus to visit
+	  by C-SKY single core SOC system. It uses mmio map apb-bus to visit
 	  the controller's register.
 
 config IMX_IRQSTEER
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index f71758632f8d..1ee95f546cb0 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -661,7 +661,7 @@ static struct its_collection *its_build_invall_cmd(struct its_node *its,
 						   struct its_cmd_desc *desc)
 {
 	its_encode_cmd(cmd, GITS_CMD_INVALL);
-	its_encode_collection(cmd, desc->its_mapc_cmd.col->col_id);
+	its_encode_collection(cmd, desc->its_invall_cmd.col->col_id);
 
 	its_fixup_cmd(cmd);
 
@@ -2376,6 +2376,8 @@ static u64 inherit_vpe_l1_table_from_its(void)
 			continue;
 
 		/* We have a winner! */
+		gic_data_rdist()->vpe_l1_base = its->tables[2].base;
+
 		val  = GICR_VPROPBASER_4_1_VALID;
 		if (baser & GITS_BASER_INDIRECT)
 			val |= GICR_VPROPBASER_4_1_INDIRECT;
@@ -2413,14 +2415,12 @@ static u64 inherit_vpe_l1_table_from_rd(cpumask_t **mask)
 
 	for_each_possible_cpu(cpu) {
 		void __iomem *base = gic_data_rdist_cpu(cpu)->rd_base;
-		u32 tmp;
 
 		if (!base || cpu == smp_processor_id())
 			continue;
 
 		val = gic_read_typer(base + GICR_TYPER);
-		tmp = compute_common_aff(val);
-		if (tmp != aff)
+		if (aff != compute_common_aff(val))
 			continue;
 
 		/*
@@ -2429,9 +2429,10 @@ static u64 inherit_vpe_l1_table_from_rd(cpumask_t **mask)
 		 * ours wrt CommonLPIAff. Let's use its own VPROPBASER.
 		 * Make sure we don't write the Z bit in that case.
 		 */
-		val = gits_read_vpropbaser(base + SZ_128K + GICR_VPROPBASER);
+		val = gicr_read_vpropbaser(base + SZ_128K + GICR_VPROPBASER);
 		val &= ~GICR_VPROPBASER_4_1_Z;
 
+		gic_data_rdist()->vpe_l1_base = gic_data_rdist_cpu(cpu)->vpe_l1_base;
 		*mask = gic_data_rdist_cpu(cpu)->vpe_table_mask;
 
 		return val;
@@ -2440,6 +2441,72 @@ static u64 inherit_vpe_l1_table_from_rd(cpumask_t **mask)
 	return 0;
 }
 
+static bool allocate_vpe_l2_table(int cpu, u32 id)
+{
+	void __iomem *base = gic_data_rdist_cpu(cpu)->rd_base;
+	u64 val, gpsz, npg;
+	unsigned int psz, esz, idx;
+	struct page *page;
+	__le64 *table;
+
+	if (!gic_rdists->has_rvpeid)
+		return true;
+
+	val  = gicr_read_vpropbaser(base + SZ_128K + GICR_VPROPBASER);
+
+	esz  = FIELD_GET(GICR_VPROPBASER_4_1_ENTRY_SIZE, val) + 1;
+	gpsz = FIELD_GET(GICR_VPROPBASER_4_1_PAGE_SIZE, val);
+	npg  = FIELD_GET(GICR_VPROPBASER_4_1_SIZE, val) + 1;
+
+	switch (gpsz) {
+	default:
+		WARN_ON(1);
+		/* fall through */
+	case GIC_PAGE_SIZE_4K:
+		psz = SZ_4K;
+		break;
+	case GIC_PAGE_SIZE_16K:
+		psz = SZ_16K;
+		break;
+	case GIC_PAGE_SIZE_64K:
+		psz = SZ_64K;
+		break;
+	}
+
+	/* Don't allow vpe_id that exceeds single, flat table limit */
+	if (!(val & GICR_VPROPBASER_4_1_INDIRECT))
+		return (id < (npg * psz / (esz * SZ_8)));
+
+	/* Compute 1st level table index & check if that exceeds table limit */
+	idx = id >> ilog2(psz / (esz * SZ_8));
+	if (idx >= (npg * psz / GITS_LVL1_ENTRY_SIZE))
+		return false;
+
+	table = gic_data_rdist_cpu(cpu)->vpe_l1_base;
+
+	/* Allocate memory for 2nd level table */
+	if (!table[idx]) {
+		page = alloc_pages(GFP_KERNEL | __GFP_ZERO, get_order(psz));
+		if (!page)
+			return false;
+
+		/* Flush Lvl2 table to PoC if hw doesn't support coherency */
+		if (!(val & GICR_VPROPBASER_SHAREABILITY_MASK))
+			gic_flush_dcache_to_poc(page_address(page), psz);
+
+		table[idx] = cpu_to_le64(page_to_phys(page) | GITS_BASER_VALID);
+
+		/* Flush Lvl1 entry to PoC if hw doesn't support coherency */
+		if (!(val & GICR_VPROPBASER_SHAREABILITY_MASK))
+			gic_flush_dcache_to_poc(table + idx, GITS_LVL1_ENTRY_SIZE);
+
+		/* Ensure updated table contents are visible to RD hardware */
+		dsb(sy);
+	}
+
+	return true;
+}
+
 static int allocate_vpe_l1_table(void)
 {
 	void __iomem *vlpi_base = gic_data_rdist_vlpi_base();
@@ -2457,8 +2524,8 @@ static int allocate_vpe_l1_table(void)
 	 * effect of making sure no doorbell will be generated and we can
 	 * then safely clear VPROPBASER.Valid.
 	 */
-	if (gits_read_vpendbaser(vlpi_base + GICR_VPENDBASER) & GICR_VPENDBASER_Valid)
-		gits_write_vpendbaser(GICR_VPENDBASER_PendingLast,
+	if (gicr_read_vpendbaser(vlpi_base + GICR_VPENDBASER) & GICR_VPENDBASER_Valid)
+		gicr_write_vpendbaser(GICR_VPENDBASER_PendingLast,
 				      vlpi_base + GICR_VPENDBASER);
 
 	/*
@@ -2481,8 +2548,8 @@ static int allocate_vpe_l1_table(void)
 
 	/* First probe the page size */
 	val = FIELD_PREP(GICR_VPROPBASER_4_1_PAGE_SIZE, GIC_PAGE_SIZE_64K);
-	gits_write_vpropbaser(val, vlpi_base + GICR_VPROPBASER);
-	val = gits_read_vpropbaser(vlpi_base + GICR_VPROPBASER);
+	gicr_write_vpropbaser(val, vlpi_base + GICR_VPROPBASER);
+	val = gicr_read_vpropbaser(vlpi_base + GICR_VPROPBASER);
 	gpsz = FIELD_GET(GICR_VPROPBASER_4_1_PAGE_SIZE, val);
 	esz = FIELD_GET(GICR_VPROPBASER_4_1_ENTRY_SIZE, val);
 
@@ -2531,7 +2598,7 @@ static int allocate_vpe_l1_table(void)
 		npg = 1;
 	}
 
-	val |= FIELD_PREP(GICR_VPROPBASER_4_1_SIZE, npg);
+	val |= FIELD_PREP(GICR_VPROPBASER_4_1_SIZE, npg - 1);
 
 	/* Right, that's the number of CPU pages we need for L1 */
 	np = DIV_ROUND_UP(npg * psz, PAGE_SIZE);
@@ -2542,7 +2609,7 @@ static int allocate_vpe_l1_table(void)
 	if (!page)
 		return -ENOMEM;
 
-	gic_data_rdist()->vpe_l1_page = page;
+	gic_data_rdist()->vpe_l1_base = page_address(page);
 	pa = virt_to_phys(page_address(page));
 	WARN_ON(!IS_ALIGNED(pa, psz));
 
@@ -2553,7 +2620,7 @@ static int allocate_vpe_l1_table(void)
 	val |= GICR_VPROPBASER_4_1_VALID;
 
 out:
-	gits_write_vpropbaser(val, vlpi_base + GICR_VPROPBASER);
+	gicr_write_vpropbaser(val, vlpi_base + GICR_VPROPBASER);
 	cpumask_set_cpu(smp_processor_id(), gic_data_rdist()->vpe_table_mask);
 
 	pr_debug("CPU%d: VPROPBASER = %llx %*pbl\n",
@@ -2660,14 +2727,14 @@ static u64 its_clear_vpend_valid(void __iomem *vlpi_base, u64 clr, u64 set)
 	bool clean;
 	u64 val;
 
-	val = gits_read_vpendbaser(vlpi_base + GICR_VPENDBASER);
+	val = gicr_read_vpendbaser(vlpi_base + GICR_VPENDBASER);
 	val &= ~GICR_VPENDBASER_Valid;
 	val &= ~clr;
 	val |= set;
-	gits_write_vpendbaser(val, vlpi_base + GICR_VPENDBASER);
+	gicr_write_vpendbaser(val, vlpi_base + GICR_VPENDBASER);
 
 	do {
-		val = gits_read_vpendbaser(vlpi_base + GICR_VPENDBASER);
+		val = gicr_read_vpendbaser(vlpi_base + GICR_VPENDBASER);
 		clean = !(val & GICR_VPENDBASER_Dirty);
 		if (!clean) {
 			count--;
@@ -2782,7 +2849,7 @@ static void its_cpu_init_lpis(void)
 		val = (LPI_NRBITS - 1) & GICR_VPROPBASER_IDBITS_MASK;
 		pr_debug("GICv4: CPU%d: Init IDbits to 0x%llx for GICR_VPROPBASER\n",
 			smp_processor_id(), val);
-		gits_write_vpropbaser(val, vlpi_base + GICR_VPROPBASER);
+		gicr_write_vpropbaser(val, vlpi_base + GICR_VPROPBASER);
 
 		/*
 		 * Also clear Valid bit of GICR_VPENDBASER, in case some
@@ -2790,7 +2857,6 @@ static void its_cpu_init_lpis(void)
 		 * corrupting memory.
 		 */
 		val = its_clear_vpend_valid(vlpi_base, 0, 0);
-		WARN_ON(val & GICR_VPENDBASER_Dirty);
 	}
 
 	if (allocate_vpe_l1_table()) {
@@ -2954,6 +3020,7 @@ static bool its_alloc_device_table(struct its_node *its, u32 dev_id)
 static bool its_alloc_vpe_table(u32 vpe_id)
 {
 	struct its_node *its;
+	int cpu;
 
 	/*
 	 * Make sure the L2 tables are allocated on *all* v4 ITSs. We
@@ -2976,6 +3043,19 @@ static bool its_alloc_vpe_table(u32 vpe_id)
 			return false;
 	}
 
+	/* Non v4.1? No need to iterate RDs and go back early. */
+	if (!gic_rdists->has_rvpeid)
+		return true;
+
+	/*
+	 * Make sure the L2 tables are allocated for all copies of
+	 * the L1 table on *all* v4.1 RDs.
+	 */
+	for_each_possible_cpu(cpu) {
+		if (!allocate_vpe_l2_table(cpu, vpe_id))
+			return false;
+	}
+
 	return true;
 }
 
@@ -3443,7 +3523,7 @@ static void its_vpe_schedule(struct its_vpe *vpe)
 	val |= (LPI_NRBITS - 1) & GICR_VPROPBASER_IDBITS_MASK;
 	val |= GICR_VPROPBASER_RaWb;
 	val |= GICR_VPROPBASER_InnerShareable;
-	gits_write_vpropbaser(val, vlpi_base + GICR_VPROPBASER);
+	gicr_write_vpropbaser(val, vlpi_base + GICR_VPROPBASER);
 
 	val  = virt_to_phys(page_address(vpe->vpt_page)) &
 		GENMASK_ULL(51, 16);
@@ -3461,7 +3541,7 @@ static void its_vpe_schedule(struct its_vpe *vpe)
 	val |= GICR_VPENDBASER_PendingLast;
 	val |= vpe->idai ? GICR_VPENDBASER_IDAI : 0;
 	val |= GICR_VPENDBASER_Valid;
-	gits_write_vpendbaser(val, vlpi_base + GICR_VPENDBASER);
+	gicr_write_vpendbaser(val, vlpi_base + GICR_VPENDBASER);
 }
 
 static void its_vpe_deschedule(struct its_vpe *vpe)
@@ -3661,7 +3741,7 @@ static void its_vpe_4_1_schedule(struct its_vpe *vpe,
 	val |= info->g1en ? GICR_VPENDBASER_4_1_VGRP1EN : 0;
 	val |= FIELD_PREP(GICR_VPENDBASER_4_1_VPEID, vpe->vpe_id);
 
-	gits_write_vpendbaser(val, vlpi_base + GICR_VPENDBASER);
+	gicr_write_vpendbaser(val, vlpi_base + GICR_VPENDBASER);
 }
 
 static void its_vpe_4_1_deschedule(struct its_vpe *vpe,
diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index 286f98222878..c1f7af9d9ae7 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -1839,6 +1839,7 @@ static struct
 	struct redist_region *redist_regs;
 	u32 nr_redist_regions;
 	bool single_redist;
+	int enabled_rdists;
 	u32 maint_irq;
 	int maint_irq_mode;
 	phys_addr_t vcpu_base;
@@ -1933,8 +1934,10 @@ static int __init gic_acpi_match_gicc(union acpi_subtable_headers *header,
 	 * If GICC is enabled and has valid gicr base address, then it means
 	 * GICR base is presented via GICC
 	 */
-	if ((gicc->flags & ACPI_MADT_ENABLED) && gicc->gicr_base_address)
+	if ((gicc->flags & ACPI_MADT_ENABLED) && gicc->gicr_base_address) {
+		acpi_data.enabled_rdists++;
 		return 0;
+	}
 
 	/*
 	 * It's perfectly valid firmware can pass disabled GICC entry, driver
@@ -1964,8 +1967,10 @@ static int __init gic_acpi_count_gicr_regions(void)
 
 	count = acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_INTERRUPT,
 				      gic_acpi_match_gicc, 0);
-	if (count > 0)
+	if (count > 0) {
 		acpi_data.single_redist = true;
+		count = acpi_data.enabled_rdists;
+	}
 
 	return count;
 }
diff --git a/include/linux/irqchip/arm-gic-v3.h b/include/linux/irqchip/arm-gic-v3.h
index f0b8ca766e7d..83439bfb6c5b 100644
--- a/include/linux/irqchip/arm-gic-v3.h
+++ b/include/linux/irqchip/arm-gic-v3.h
@@ -652,10 +652,10 @@ struct rdists {
 	struct {
 		void __iomem	*rd_base;
 		struct page	*pend_page;
-		struct page	*vpe_l1_page;
 		phys_addr_t	phys_base;
 		bool		lpi_enabled;
 		cpumask_t	*vpe_table_mask;
+		void		*vpe_l1_base;
 	} __percpu		*rdist;
 	phys_addr_t		prop_table_pa;
 	void			*prop_table_va;
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 818b2802d3e7..3089a60ea8f9 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -731,6 +731,13 @@ static int set_irq_wake_real(unsigned int irq, unsigned int on)
  *
  *	Wakeup mode lets this IRQ wake the system from sleep
  *	states like "suspend to RAM".
+ *
+ *	Note: irq enable/disable state is completely orthogonal
+ *	to the enable/disable state of irq wake. An irq can be
+ *	disabled with disable_irq() and still wake the system as
+ *	long as the irq has wake enabled. If this does not hold,
+ *	then the underlying irq chip and the related driver need
+ *	to be investigated.
  */
 int irq_set_irq_wake(unsigned int irq, unsigned int on)
 {

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