summaryrefslogtreecommitdiff
path: root/drivers
diff options
context:
space:
mode:
authorZenghui Yu <yuzenghui@huawei.com>2020-02-06 10:57:08 +0300
committerMarc Zyngier <maz@kernel.org>2020-02-08 13:01:33 +0300
commit4e6437f12d6e929e802f5599a2d50dfcf92d0f50 (patch)
treeb45df6503a6f78144befaf910cf1e093b15e488e /drivers
parent8b718d403c5cdc7f0ea492c33ec88169f3e76462 (diff)
downloadlinux-4e6437f12d6e929e802f5599a2d50dfcf92d0f50.tar.xz
irqchip/gic-v4.1: Ensure L2 vPE table is allocated at RD level
In GICv4, we will ensure that level2 vPE table memory is allocated for the specified vpe_id on all v4 ITS, in its_alloc_vpe_table(). This still works well for the typical GICv4.1 implementation, where the new vPE table is shared between the ITSs and the RDs. To make it explicit, let us introduce allocate_vpe_l2_table() to make sure that the L2 tables are allocated on all v4.1 RDs. We're likely not need to allocate memory in it because the vPE table is shared and (L2 table is) already allocated at ITS level, except for the case where the ITS doesn't share anything (say SVPET == 0, practically unlikely but architecturally allowed). The implementation of allocate_vpe_l2_table() is mostly copied from its_alloc_table_entry(). Signed-off-by: Zenghui Yu <yuzenghui@huawei.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20200206075711.1275-4-yuzenghui@huawei.com
Diffstat (limited to 'drivers')
-rw-r--r--drivers/irqchip/irq-gic-v3-its.c80
1 files changed, 80 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 0f1fe56ce0af..ae4e7b355b46 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -2443,6 +2443,72 @@ 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 = gits_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();
@@ -2957,6 +3023,7 @@ 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
@@ -2979,6 +3046,19 @@ 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;
}