[PATCH OLK-6.6 5/5] gicv3: add lpi support for cvm guest

3 Aug 2024

From: Jingxian He hejingxian@huawei.com
virtcca inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/IAGYKI
--------------------------------
Add lpi support for cvm guest os:
The gic-its driver mapped memory must shared with qemu/kvm.
The cvm guest gic-its driver alloc memory from bounce buffer
to share with qemu/kvm.
Signed-off-by: Jingxian He hejingxian@huawei.com
Signed-off-by: wuweinan wuweinan@huawei.com
---
 drivers/irqchip/irq-gic-v3-its.c | 231 ++++++++++++++++++++++++++++---
 1 file changed, 210 insertions(+), 21 deletions(-)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 0fa706a47..05700ae89 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -29,6 +29,10 @@
 #include <linux/percpu.h>
 #include <linux/slab.h>
 #include <linux/syscore_ops.h>
+#ifdef CONFIG_HISI_VIRTCCA_GUEST
+#include <linux/swiotlb.h>
+#include <asm/virtcca_cvm_guest.h>
+#endif
#include <linux/irqchip.h>
 #include <linux/irqchip/arm-gic-v3.h>
@@ -399,6 +403,93 @@ static int build_devid_pools(void)
 }
 #endif
+#ifdef CONFIG_HISI_VIRTCCA_GUEST
+
+static struct device cvm_alloc_device;
+static LIST_HEAD(cvm_its_nodes);
+static raw_spinlock_t cvm_its_lock;
+
+struct its_device_order {
+	struct its_device *dev;
+	struct list_head entry;
+	int itt_order;
+};
+
+static inline struct page *its_alloc_shared_pages_node(int node, gfp_t gfp,
+			unsigned int order)
+{
+	return swiotlb_alloc(&cvm_alloc_device, (1 << order) * PAGE_SIZE);
+}
+
+static inline struct page *its_alloc_shared_pages(gfp_t gfp, unsigned int order)
+{
+	return its_alloc_shared_pages_node(NUMA_NO_NODE, gfp, order);
+}
+
+static void its_free_shared_pages(void *addr, int order)
+{
+	if (order < 0)
+		return;
+
+	swiotlb_free(&cvm_alloc_device, (struct page *)addr, (1 << order) * PAGE_SIZE);
+}
+
+static int add_its_device_order(struct its_device *dev, int itt_order)
+{
+	struct its_device_order *new;
+	unsigned long flags;
+
+	new = kmalloc(sizeof(struct its_device_order), GFP_KERNEL);
+	if (!new)
+		return -ENOMEM;
+	new->dev = dev;
+	new->itt_order = itt_order;
+	raw_spin_lock_irqsave(&cvm_its_lock, flags);
+	list_add_tail(&new->entry, &cvm_its_nodes);
+	raw_spin_unlock_irqrestore(&cvm_its_lock, flags);
+	return 0;
+}
+
+/* get its device order and then free its device order */
+static int get_its_device_order(struct its_device *dev)
+{
+	struct its_device_order *pos, *tmp;
+	unsigned long flags;
+	int itt_order = -1;
+
+	raw_spin_lock_irqsave(&cvm_its_lock, flags);
+	list_for_each_entry_safe(pos, tmp, &cvm_its_nodes, entry) {
+		if (pos->dev == dev) {
+			itt_order = pos->itt_order;
+			list_del(&pos->entry);
+			kfree(pos);
+			goto found;
+		}
+	}
+found:
+	raw_spin_unlock_irqrestore(&cvm_its_lock, flags);
+	return itt_order;
+}
+
+static void *its_alloc_shared_page_address(struct its_device *dev,
+			struct its_node *its, int sz)
+{
+	struct page *page;
+	int itt_order;
+
+	itt_order = get_order(sz);
+	if (add_its_device_order(dev, itt_order))
+		return NULL;
+
+	page = its_alloc_shared_pages_node(its->numa_node, GFP_KERNEL | __GFP_ZERO,
+			   itt_order);
+	if (!page)
+		return NULL;
+	return (void *)page_address(page);
+}
+
+#endif
+
 /*
  * Skip ITSs that have no vLPIs mapped, unless we're on GICv4.1, as we
  * always have vSGIs mapped.
@@ -2441,7 +2532,13 @@ static struct page *its_allocate_prop_table(gfp_t gfp_flags)
 {
    struct page *prop_page;
-	prop_page = alloc_pages(gfp_flags, get_order(LPI_PROPBASE_SZ));
+#ifdef CONFIG_HISI_VIRTCCA_GUEST
+	if (is_virtcca_cvm_world())
+		prop_page = its_alloc_shared_pages(gfp_flags,
+			get_order(LPI_PROPBASE_SZ));
+	else
+#endif
+		prop_page = alloc_pages(gfp_flags, get_order(LPI_PROPBASE_SZ));
    if (!prop_page)
    	return NULL;
@@ -2452,8 +2549,14 @@ static struct page *its_allocate_prop_table(gfp_t gfp_flags)
static void its_free_prop_table(struct page *prop_page)
 {
-	free_pages((unsigned long)page_address(prop_page),
-		   get_order(LPI_PROPBASE_SZ));
+#ifdef CONFIG_HISI_VIRTCCA_GUEST
+	if (is_virtcca_cvm_world())
+		its_free_shared_pages(page_address(prop_page),
+			get_order(LPI_PROPBASE_SZ));
+	else
+#endif
+		free_pages((unsigned long)page_address(prop_page),
+			get_order(LPI_PROPBASE_SZ));
 }
static bool gic_check_reserved_range(phys_addr_t addr, unsigned long size)
@@ -2575,7 +2678,13 @@ static int its_setup_baser(struct its_node *its, struct its_baser *baser,
    	order = get_order(GITS_BASER_PAGES_MAX * psz);
    }
-	page = alloc_pages_node(its->numa_node, GFP_KERNEL | __GFP_ZERO, order);
+#ifdef CONFIG_HISI_VIRTCCA_GUEST
+	if (is_virtcca_cvm_world())
+		page = its_alloc_shared_pages_node(its->numa_node,
+			GFP_KERNEL | __GFP_ZERO, order);
+	else
+#endif
+		page = alloc_pages_node(its->numa_node, GFP_KERNEL | __GFP_ZERO, order);
    if (!page)
    	return -ENOMEM;
@@ -2588,7 +2697,12 @@ static int its_setup_baser(struct its_node *its, struct its_baser *baser,
    	/* 52bit PA is supported only when PageSize=64K */
    	if (psz != SZ_64K) {
    		pr_err("ITS: no 52bit PA support when psz=%d\n", psz);
-			free_pages((unsigned long)base, order);
+#ifdef CONFIG_HISI_VIRTCCA_GUEST
+			if (is_virtcca_cvm_world())
+				its_free_shared_pages(base, order);
+			else
+#endif
+				free_pages((unsigned long)base, order);
    		return -ENXIO;
    	}
@@ -2644,7 +2758,12 @@ static int its_setup_baser(struct its_node *its, struct its_baser *baser,
    	pr_err("ITS@%pa: %s doesn't stick: %llx %llx\n",
    	       &its->phys_base, its_base_type_string[type],
    	       val, tmp);
-		free_pages((unsigned long)base, order);
+#ifdef CONFIG_HISI_VIRTCCA_GUEST
+		if (is_virtcca_cvm_world())
+			its_free_shared_pages(base, order);
+		else
+#endif
+			free_pages((unsigned long)base, order);
    	return -ENXIO;
    }
@@ -2783,8 +2902,14 @@ static void its_free_tables(struct its_node *its)
for (i = 0; i < GITS_BASER_NR_REGS; i++) {
    	if (its->tables[i].base) {
-			free_pages((unsigned long)its->tables[i].base,
-				   its->tables[i].order);
+#ifdef CONFIG_HISI_VIRTCCA_GUEST
+			if (is_virtcca_cvm_world())
+				its_free_shared_pages(its->tables[i].base,
+					its->tables[i].order);
+			else
+#endif
+				free_pages((unsigned long)its->tables[i].base,
+					   its->tables[i].order);
    		its->tables[i].base = NULL;
    	}
    }
@@ -3054,7 +3179,13 @@ static bool allocate_vpe_l2_table(int cpu, u32 id)
/* Allocate memory for 2nd level table */
    if (!table[idx]) {
-		page = alloc_pages(GFP_KERNEL | __GFP_ZERO, get_order(psz));
+#ifdef CONFIG_HISI_VIRTCCA_GUEST
+		if (is_virtcca_cvm_world())
+			page = its_alloc_shared_pages(GFP_KERNEL | __GFP_ZERO,
+				get_order(psz));
+		else
+#endif
+			page = alloc_pages(GFP_KERNEL | __GFP_ZERO, get_order(psz));
    	if (!page)
    		return false;
@@ -3173,7 +3304,13 @@ static int allocate_vpe_l1_table(void)
pr_debug("np = %d, npg = %lld, psz = %d, epp = %d, esz = %d\n",
    	 np, npg, psz, epp, esz);
-	page = alloc_pages(GFP_ATOMIC | __GFP_ZERO, get_order(np * PAGE_SIZE));
+#ifdef CONFIG_HISI_VIRTCCA_GUEST
+	if (is_virtcca_cvm_world())
+		page = its_alloc_shared_pages(GFP_ATOMIC | __GFP_ZERO,
+			get_order(np * PAGE_SIZE));
+	else
+#endif
+		page = alloc_pages(GFP_ATOMIC | __GFP_ZERO, get_order(np * PAGE_SIZE));
    if (!page)
    	return -ENOMEM;
@@ -3219,8 +3356,14 @@ static struct page *its_allocate_pending_table(gfp_t gfp_flags)
 {
    struct page *pend_page;
-	pend_page = alloc_pages(gfp_flags | __GFP_ZERO,
-				get_order(LPI_PENDBASE_SZ));
+#ifdef CONFIG_HISI_VIRTCCA_GUEST
+	if (is_virtcca_cvm_world())
+		pend_page = its_alloc_shared_pages(gfp_flags | __GFP_ZERO,
+			get_order(LPI_PENDBASE_SZ));
+	else
+#endif
+		pend_page = alloc_pages(gfp_flags | __GFP_ZERO,
+					get_order(LPI_PENDBASE_SZ));
    if (!pend_page)
    	return NULL;
@@ -3232,7 +3375,13 @@ static struct page *its_allocate_pending_table(gfp_t gfp_flags)
static void its_free_pending_table(struct page *pt)
 {
-	free_pages((unsigned long)page_address(pt), get_order(LPI_PENDBASE_SZ));
+#ifdef CONFIG_HISI_VIRTCCA_GUEST
+	if (is_virtcca_cvm_world())
+		its_free_shared_pages(page_address(pt),
+			get_order(LPI_PENDBASE_SZ));
+	else
+#endif
+		free_pages((unsigned long)page_address(pt), get_order(LPI_PENDBASE_SZ));
 }
/*
@@ -3567,8 +3716,15 @@ static bool its_alloc_table_entry(struct its_node *its,
/* Allocate memory for 2nd level table */
    if (!table[idx]) {
-		page = alloc_pages_node(its->numa_node, GFP_KERNEL | __GFP_ZERO,
-					get_order(baser->psz));
+#ifdef CONFIG_HISI_VIRTCCA_GUEST
+		if (is_virtcca_cvm_world())
+			page = its_alloc_shared_pages_node(its->numa_node,
+						GFP_KERNEL | __GFP_ZERO,
+						get_order(baser->psz));
+		else
+#endif
+			page = alloc_pages_node(its->numa_node, GFP_KERNEL | __GFP_ZERO,
+						get_order(baser->psz));
    	if (!page)
    		return false;
@@ -3671,7 +3827,12 @@ static struct its_device *its_create_device(struct its_node *its, u32 dev_id,
    nr_ites = max(2, nvecs);
    sz = nr_ites * (FIELD_GET(GITS_TYPER_ITT_ENTRY_SIZE, its->typer) + 1);
    sz = max(sz, ITS_ITT_ALIGN) + ITS_ITT_ALIGN - 1;
-	itt = kzalloc_node(sz, GFP_KERNEL, its->numa_node);
+#ifdef CONFIG_HISI_VIRTCCA_GUEST
+	if (is_virtcca_cvm_world())
+		itt = its_alloc_shared_page_address(dev, its, sz);
+	else
+#endif
+		itt = kzalloc_node(sz, GFP_KERNEL, its->numa_node);
    if (alloc_lpis) {
    	lpi_map = its_lpi_alloc(nvecs, &lpi_base, &nr_lpis);
    	if (lpi_map)
@@ -3685,7 +3846,12 @@ static struct its_device *its_create_device(struct its_node *its, u32 dev_id,
if (!dev || !itt ||  !col_map || (!lpi_map && alloc_lpis)) {
    	kfree(dev);
-		kfree(itt);
+#ifdef CONFIG_HISI_VIRTCCA_GUEST
+		if (is_virtcca_cvm_world())
+			its_free_shared_pages(itt, get_order(sz));
+		else
+#endif
+			kfree(itt);
    	bitmap_free(lpi_map);
    	kfree(col_map);
    	return NULL;
@@ -3722,7 +3888,12 @@ static void its_free_device(struct its_device *its_dev)
    list_del(&its_dev->entry);
    raw_spin_unlock_irqrestore(&its_dev->its->lock, flags);
    kfree(its_dev->event_map.col_map);
-	kfree(its_dev->itt);
+#ifdef CONFIG_HISI_VIRTCCA_GUEST
+	if (is_virtcca_cvm_world())
+		its_free_shared_pages(its_dev->itt, get_its_device_order(its_dev));
+	else
+#endif
+		kfree(its_dev->itt);
#ifdef CONFIG_VIRT_PLAT_DEV
    if (its_dev->is_vdev) {
@@ -5465,8 +5636,15 @@ static int __init its_probe_one(struct its_node *its)
    	}
    }
-	page = alloc_pages_node(its->numa_node, GFP_KERNEL | __GFP_ZERO,
-				get_order(ITS_CMD_QUEUE_SZ));
+#ifdef CONFIG_HISI_VIRTCCA_GUEST
+	if (is_virtcca_cvm_world())
+		page = its_alloc_shared_pages_node(its->numa_node,
+					GFP_KERNEL | __GFP_ZERO,
+					get_order(ITS_CMD_QUEUE_SZ));
+	else
+#endif
+		page = alloc_pages_node(its->numa_node, GFP_KERNEL | __GFP_ZERO,
+					get_order(ITS_CMD_QUEUE_SZ));
    if (!page) {
    	err = -ENOMEM;
    	goto out_unmap_sgir;
@@ -5530,7 +5708,12 @@ static int __init its_probe_one(struct its_node *its)
 out_free_tables:
    its_free_tables(its);
 out_free_cmd:
-	free_pages((unsigned long)its->cmd_base, get_order(ITS_CMD_QUEUE_SZ));
+#ifdef CONFIG_HISI_VIRTCCA_GUEST
+	if (is_virtcca_cvm_world())
+		its_free_shared_pages(its->cmd_base, get_order(ITS_CMD_QUEUE_SZ));
+	else
+#endif
+		free_pages((unsigned long)its->cmd_base, get_order(ITS_CMD_QUEUE_SZ));
 out_unmap_sgir:
    if (its->sgir_base)
    	iounmap(its->sgir_base);
@@ -6019,6 +6202,12 @@ int __init its_init(struct fwnode_handle *handle, struct rdists *rdists,
 #endif
    int err;
+#ifdef CONFIG_HISI_VIRTCCA_GUEST
+	if (is_virtcca_cvm_world()) {
+		device_initialize(&cvm_alloc_device);
+		raw_spin_lock_init(&cvm_its_lock);
+	}
+#endif
    gic_rdists = rdists;
its_parent = parent_domain;
-- 
2.27.0


    

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[PATCH OLK-6.6 5/5] gicv3: add lpi support for cvm guest