Re: [kvm-unit-tests PATCH v3 06/14] arm/arm64: gicv3: Set the LPI config and pending tables

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Hi Eric,

On 2020/1/28 18:34, Eric Auger wrote:
Allocate the LPI configuration and per re-distributor pending table.
Set redistributor's PROPBASER and PENDBASER. The LPIs are enabled
by default in the config table.

Also introduce a helper routine that allows to set the pending table
bit for a given LPI.

Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx>

---

v2 -> v3:
- Move the helpers in lib/arm/gic-v3.c and prefix them with "gicv3_"
   and add _lpi prefix too

v1 -> v2:
- remove memory attributes
---
  lib/arm/asm/gic-v3.h | 16 +++++++++++
  lib/arm/gic-v3.c     | 64 ++++++++++++++++++++++++++++++++++++++++++++
  2 files changed, 80 insertions(+)

diff --git a/lib/arm/asm/gic-v3.h b/lib/arm/asm/gic-v3.h
index ffb2e26..ec2a6f0 100644
--- a/lib/arm/asm/gic-v3.h
+++ b/lib/arm/asm/gic-v3.h
@@ -48,6 +48,16 @@
  #define MPIDR_TO_SGI_AFFINITY(cluster_id, level) \
  	(MPIDR_AFFINITY_LEVEL(cluster_id, level) << ICC_SGI1R_AFFINITY_## level ## _SHIFT)
+#define GICR_PROPBASER_IDBITS_MASK (0x1f)

This is not being used.  You can use it when calculating prop_val
or just drop it.

+
+#define GICR_PENDBASER_PTZ                              BIT_ULL(62)
+
+#define LPI_PROP_GROUP1		(1 << 1)
+#define LPI_PROP_ENABLED	(1 << 0)
+#define LPI_PROP_DEFAULT_PRIO   0xa0
+#define LPI_PROP_DEFAULT	(LPI_PROP_DEFAULT_PRIO | LPI_PROP_GROUP1 | \
+				 LPI_PROP_ENABLED)
+
  #include <asm/arch_gicv3.h>
#ifndef __ASSEMBLY__
@@ -64,6 +74,8 @@ struct gicv3_data {
  	void *dist_base;
  	void *redist_bases[GICV3_NR_REDISTS];
  	void *redist_base[NR_CPUS];
+	void *lpi_prop;
+	void *lpi_pend[NR_CPUS];
  	unsigned int irq_nr;
  };
  extern struct gicv3_data gicv3_data;
@@ -80,6 +92,10 @@ extern void gicv3_write_eoir(u32 irqstat);
  extern void gicv3_ipi_send_single(int irq, int cpu);
  extern void gicv3_ipi_send_mask(int irq, const cpumask_t *dest);
  extern void gicv3_set_redist_base(size_t stride);
+extern void gicv3_lpi_set_config(int n, u8 val);
+extern u8 gicv3_lpi_get_config(int n);
+extern void gicv3_lpi_set_pending_table_bit(int rdist, int n, bool set);
+extern void gicv3_lpi_alloc_tables(void);
static inline void gicv3_do_wait_for_rwp(void *base)
  {
diff --git a/lib/arm/gic-v3.c b/lib/arm/gic-v3.c
index feecb5e..c33f883 100644
--- a/lib/arm/gic-v3.c
+++ b/lib/arm/gic-v3.c
@@ -5,6 +5,7 @@
   */
  #include <asm/gic.h>
  #include <asm/io.h>
+#include <alloc_page.h>
void gicv3_set_redist_base(size_t stride)
  {
@@ -147,3 +148,66 @@ void gicv3_ipi_send_single(int irq, int cpu)
  	cpumask_set_cpu(cpu, &dest);
  	gicv3_ipi_send_mask(irq, &dest);
  }
+
+#if defined(__aarch64__)
+/* alloc_lpi_tables: Allocate LPI config and pending tables */
+void gicv3_lpi_alloc_tables(void)
+{
+	unsigned long n = SZ_64K >> PAGE_SHIFT;
+	unsigned long order = fls(n);
+	u64 prop_val;
+	int cpu;
+
+	gicv3_data.lpi_prop = (void *)virt_to_phys(alloc_pages(order));
+
+	/* ID bits = 13, ie. up to 14b LPI INTID */
+	prop_val = (u64)gicv3_data.lpi_prop | 13;
+
+	/*
+	 * Allocate pending tables for each redistributor
+	 * and set PROPBASER and PENDBASER
+	 */
+	for_each_present_cpu(cpu) {
+		u64 pend_val;
+		void *ptr;
+
+		ptr = gicv3_data.redist_base[cpu];
+
+		writeq(prop_val, ptr + GICR_PROPBASER);
+
+		gicv3_data.lpi_pend[cpu] = (void *)virt_to_phys(alloc_pages(order));
+
+		pend_val = (u64)gicv3_data.lpi_pend[cpu];
+
+		writeq(pend_val, ptr + GICR_PENDBASER);
+	}
+}
+
+void gicv3_lpi_set_config(int n, u8 value)
+{
+	u8 *entry = (u8 *)(gicv3_data.lpi_prop + (n - 8192));

But this is actually the *physical* address, shouldn't it be
converted by phys_to_virt() before reading/writing something?
Like what you've done for the 'lpi_pend[rdist]' before writing
pending bit.  Or I'm missing some points here?

+
+	*entry = value;
+}
+
+u8 gicv3_lpi_get_config(int n)
+{
+	u8 *entry = (u8 *)(gicv3_data.lpi_prop + (n - 8192));

The same as above.


Thanks,
Zenghui

+
+	return *entry;
+}
+
+void gicv3_lpi_set_pending_table_bit(int rdist, int n, bool set)
+{
+	u8 *ptr = phys_to_virt((phys_addr_t)gicv3_data.lpi_pend[rdist]);
+	u8 mask = 1 << (n % 8), byte;
+
+	ptr += (n / 8);
+	byte = *ptr;
+	if (set)
+		byte |=  mask;
+	else
+		byte &= ~mask;
+	*ptr = byte;
+}
+#endif /* __aarch64__ */


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