Merging upstream version 6.8.9.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 237 insertions, 0 deletions

diff --git a/drivers/gpu/drm/imagination/pvr_vm_mips.c b/drivers/gpu/drm/imagination/pvr_vm_mips.c
new file mode 100644
index 000000000..b7fef3c79
--- /dev/null
+++ b/drivers/gpu/drm/imagination/pvr_vm_mips.c
@@ -0,0 +1,237 @@
+// SPDX-License-Identifier: GPL-2.0-only OR MIT
+/* Copyright (c) 2023 Imagination Technologies Ltd. */
+
+#include "pvr_device.h"
+#include "pvr_fw_mips.h"
+#include "pvr_gem.h"
+#include "pvr_mmu.h"
+#include "pvr_rogue_mips.h"
+#include "pvr_vm.h"
+#include "pvr_vm_mips.h"
+
+#include <drm/drm_managed.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+/**
+ * pvr_vm_mips_init() - Initialise MIPS FW pagetable
+ * @pvr_dev: Target PowerVR device.
+ *
+ * Returns:
+ *  * 0 on success,
+ *  * -%EINVAL,
+ *  * Any error returned by pvr_gem_object_create(), or
+ *  * And error returned by pvr_gem_object_vmap().
+ */
+int
+pvr_vm_mips_init(struct pvr_device *pvr_dev)
+{
+	u32 pt_size = 1 << ROGUE_MIPSFW_LOG2_PAGETABLE_SIZE_4K(pvr_dev);
+	struct device *dev = from_pvr_device(pvr_dev)->dev;
+	struct pvr_fw_mips_data *mips_data;
+	u32 phys_bus_width;
+	int page_nr;
+	int err;
+
+	/* Page table size must be at most ROGUE_MIPSFW_MAX_NUM_PAGETABLE_PAGES * 4k pages. */
+	if (pt_size > ROGUE_MIPSFW_MAX_NUM_PAGETABLE_PAGES * SZ_4K)
+		return -EINVAL;
+
+	if (PVR_FEATURE_VALUE(pvr_dev, phys_bus_width, &phys_bus_width))
+		return -EINVAL;
+
+	mips_data = drmm_kzalloc(from_pvr_device(pvr_dev), sizeof(*mips_data), GFP_KERNEL);
+	if (!mips_data)
+		return -ENOMEM;
+
+	for (page_nr = 0; page_nr < ARRAY_SIZE(mips_data->pt_pages); page_nr++) {
+		mips_data->pt_pages[page_nr] = alloc_page(GFP_KERNEL | __GFP_ZERO);
+		if (!mips_data->pt_pages[page_nr]) {
+			err = -ENOMEM;
+			goto err_free_pages;
+		}
+
+		mips_data->pt_dma_addr[page_nr] = dma_map_page(dev, mips_data->pt_pages[page_nr], 0,
+							       PAGE_SIZE, DMA_TO_DEVICE);
+		if (dma_mapping_error(dev, mips_data->pt_dma_addr[page_nr])) {
+			err = -ENOMEM;
+			__free_page(mips_data->pt_pages[page_nr]);
+			goto err_free_pages;
+		}
+	}
+
+	mips_data->pt = vmap(mips_data->pt_pages, pt_size >> PAGE_SHIFT, VM_MAP,
+			     pgprot_writecombine(PAGE_KERNEL));
+	if (!mips_data->pt) {
+		err = -ENOMEM;
+		goto err_free_pages;
+	}
+
+	mips_data->pfn_mask = (phys_bus_width > 32) ? ROGUE_MIPSFW_ENTRYLO_PFN_MASK_ABOVE_32BIT :
+						      ROGUE_MIPSFW_ENTRYLO_PFN_MASK;
+
+	mips_data->cache_policy = (phys_bus_width > 32) ? ROGUE_MIPSFW_CACHED_POLICY_ABOVE_32BIT :
+							  ROGUE_MIPSFW_CACHED_POLICY;
+
+	pvr_dev->fw_dev.processor_data.mips_data = mips_data;
+
+	return 0;
+
+err_free_pages:
+	while (--page_nr >= 0) {
+		dma_unmap_page(from_pvr_device(pvr_dev)->dev,
+			       mips_data->pt_dma_addr[page_nr], PAGE_SIZE, DMA_TO_DEVICE);
+
+		__free_page(mips_data->pt_pages[page_nr]);
+	}
+
+	return err;
+}
+
+/**
+ * pvr_vm_mips_fini() - Release MIPS FW pagetable
+ * @pvr_dev: Target PowerVR device.
+ */
+void
+pvr_vm_mips_fini(struct pvr_device *pvr_dev)
+{
+	struct pvr_fw_device *fw_dev = &pvr_dev->fw_dev;
+	struct pvr_fw_mips_data *mips_data = fw_dev->processor_data.mips_data;
+	int page_nr;
+
+	vunmap(mips_data->pt);
+	for (page_nr = ARRAY_SIZE(mips_data->pt_pages) - 1; page_nr >= 0; page_nr--) {
+		dma_unmap_page(from_pvr_device(pvr_dev)->dev,
+			       mips_data->pt_dma_addr[page_nr], PAGE_SIZE, DMA_TO_DEVICE);
+
+		__free_page(mips_data->pt_pages[page_nr]);
+	}
+
+	fw_dev->processor_data.mips_data = NULL;
+}
+
+static u32
+get_mips_pte_flags(bool read, bool write, u32 cache_policy)
+{
+	u32 flags = 0;
+
+	if (read && write) /* Read/write. */
+		flags |= ROGUE_MIPSFW_ENTRYLO_DIRTY_EN;
+	else if (write)    /* Write only. */
+		flags |= ROGUE_MIPSFW_ENTRYLO_READ_INHIBIT_EN;
+	else
+		WARN_ON(!read);
+
+	flags |= cache_policy << ROGUE_MIPSFW_ENTRYLO_CACHE_POLICY_SHIFT;
+
+	flags |= ROGUE_MIPSFW_ENTRYLO_VALID_EN | ROGUE_MIPSFW_ENTRYLO_GLOBAL_EN;
+
+	return flags;
+}
+
+/**
+ * pvr_vm_mips_map() - Map a FW object into MIPS address space
+ * @pvr_dev: Target PowerVR device.
+ * @fw_obj: FW object to map.
+ *
+ * Returns:
+ *  * 0 on success,
+ *  * -%EINVAL if object does not reside within FW address space, or
+ *  * Any error returned by pvr_fw_object_get_dma_addr().
+ */
+int
+pvr_vm_mips_map(struct pvr_device *pvr_dev, struct pvr_fw_object *fw_obj)
+{
+	struct pvr_fw_device *fw_dev = &pvr_dev->fw_dev;
+	struct pvr_fw_mips_data *mips_data = fw_dev->processor_data.mips_data;
+	struct pvr_gem_object *pvr_obj = fw_obj->gem;
+	const u64 start = fw_obj->fw_mm_node.start;
+	const u64 size = fw_obj->fw_mm_node.size;
+	u64 end;
+	u32 cache_policy;
+	u32 pte_flags;
+	s32 start_pfn;
+	s32 end_pfn;
+	s32 pfn;
+	int err;
+
+	if (check_add_overflow(start, size - 1, &end))
+		return -EINVAL;
+
+	if (start < ROGUE_FW_HEAP_BASE ||
+	    start >= ROGUE_FW_HEAP_BASE + fw_dev->fw_heap_info.raw_size ||
+	    end < ROGUE_FW_HEAP_BASE ||
+	    end >= ROGUE_FW_HEAP_BASE + fw_dev->fw_heap_info.raw_size ||
+	    (start & ROGUE_MIPSFW_PAGE_MASK_4K) ||
+	    ((end + 1) & ROGUE_MIPSFW_PAGE_MASK_4K))
+		return -EINVAL;
+
+	start_pfn = (start & fw_dev->fw_heap_info.offset_mask) >> ROGUE_MIPSFW_LOG2_PAGE_SIZE_4K;
+	end_pfn = (end & fw_dev->fw_heap_info.offset_mask) >> ROGUE_MIPSFW_LOG2_PAGE_SIZE_4K;
+
+	if (pvr_obj->flags & PVR_BO_FW_FLAGS_DEVICE_UNCACHED)
+		cache_policy = ROGUE_MIPSFW_UNCACHED_CACHE_POLICY;
+	else
+		cache_policy = mips_data->cache_policy;
+
+	pte_flags = get_mips_pte_flags(true, true, cache_policy);
+
+	for (pfn = start_pfn; pfn <= end_pfn; pfn++) {
+		dma_addr_t dma_addr;
+		u32 pte;
+
+		err = pvr_fw_object_get_dma_addr(fw_obj,
+						 (pfn - start_pfn) <<
+						 ROGUE_MIPSFW_LOG2_PAGE_SIZE_4K,
+						 &dma_addr);
+		if (err)
+			goto err_unmap_pages;
+
+		pte = ((dma_addr >> ROGUE_MIPSFW_LOG2_PAGE_SIZE_4K)
+		       << ROGUE_MIPSFW_ENTRYLO_PFN_SHIFT) & mips_data->pfn_mask;
+		pte |= pte_flags;
+
+		WRITE_ONCE(mips_data->pt[pfn], pte);
+	}
+
+	pvr_mmu_flush_request_all(pvr_dev);
+
+	return 0;
+
+err_unmap_pages:
+	while (--pfn >= start_pfn)
+		WRITE_ONCE(mips_data->pt[pfn], 0);
+
+	pvr_mmu_flush_request_all(pvr_dev);
+	WARN_ON(pvr_mmu_flush_exec(pvr_dev, true));
+
+	return err;
+}
+
+/**
+ * pvr_vm_mips_unmap() - Unmap a FW object into MIPS address space
+ * @pvr_dev: Target PowerVR device.
+ * @fw_obj: FW object to unmap.
+ */
+void
+pvr_vm_mips_unmap(struct pvr_device *pvr_dev, struct pvr_fw_object *fw_obj)
+{
+	struct pvr_fw_device *fw_dev = &pvr_dev->fw_dev;
+	struct pvr_fw_mips_data *mips_data = fw_dev->processor_data.mips_data;
+	const u64 start = fw_obj->fw_mm_node.start;
+	const u64 size = fw_obj->fw_mm_node.size;
+	const u64 end = start + size;
+
+	const u32 start_pfn = (start & fw_dev->fw_heap_info.offset_mask) >>
+			      ROGUE_MIPSFW_LOG2_PAGE_SIZE_4K;
+	const u32 end_pfn = (end & fw_dev->fw_heap_info.offset_mask) >>
+			    ROGUE_MIPSFW_LOG2_PAGE_SIZE_4K;
+
+	for (u32 pfn = start_pfn; pfn < end_pfn; pfn++)
+		WRITE_ONCE(mips_data->pt[pfn], 0);
+
+	pvr_mmu_flush_request_all(pvr_dev);
+	WARN_ON(pvr_mmu_flush_exec(pvr_dev, true));
+}