// SPDX-License-Identifier: MIT
/*
* Copyright © 2019 Intel Corporation
*/
#include "i915_drv.h"
#include "i915_pci.h"
#include "i915_reg.h"
#include "intel_memory_region.h"
#include "intel_pci_config.h"
#include "intel_region_lmem.h"
#include "intel_region_ttm.h"
#include "gem/i915_gem_lmem.h"
#include "gem/i915_gem_region.h"
#include "gem/i915_gem_ttm.h"
#include "gt/intel_gt.h"
#include "gt/intel_gt_mcr.h"
#include "gt/intel_gt_regs.h"
#ifdef CONFIG_64BIT
static void _release_bars(struct pci_dev *pdev)
{
int resno;
for (resno = PCI_STD_RESOURCES; resno < PCI_STD_RESOURCE_END; resno++) {
if (pci_resource_len(pdev, resno))
pci_release_resource(pdev, resno);
}
}
static void
_resize_bar(struct drm_i915_private *i915, int resno, resource_size_t size)
{
struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
int bar_size = pci_rebar_bytes_to_size(size);
int ret;
_release_bars(pdev);
ret = pci_resize_resource(pdev, resno, bar_size);
if (ret) {
drm_info(&i915->drm, "Failed to resize BAR%d to %dM (%pe)\n",
resno, 1 << bar_size, ERR_PTR(ret));
return;
}
drm_info(&i915->drm, "BAR%d resized to %dM\n", resno, 1 << bar_size);
}
static void i915_resize_lmem_bar(struct drm_i915_private *i915, resource_size_t lmem_size)
{
struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
struct pci_bus *root = pdev->bus;
struct resource *root_res;
resource_size_t rebar_size;
resource_size_t current_size;
intel_wakeref_t wakeref;
u32 pci_cmd;
int i;
current_size = roundup_pow_of_two(pci_resource_len(pdev, GEN12_LMEM_BAR));
if (i915->params.lmem_bar_size) {
u32 bar_sizes;
rebar_size = i915->params.lmem_bar_size *
(resource_size_t)SZ_1M;
bar_sizes = pci_rebar_get_possible_sizes(pdev, GEN12_LMEM_BAR);
if (rebar_size == current_size)
return;
if (!(bar_sizes & BIT(pci_rebar_bytes_to_size(rebar_size))) ||
rebar_size >= roundup_pow_of_two(lmem_size)) {
rebar_size = lmem_size;
drm_info(&i915->drm,
"Given bar size is not within supported size, setting it to default: %llu\n",
(u64)lmem_size >> 20);
}
} else {
rebar_size = current_size;
if (rebar_size != roundup_pow_of_two(lmem_size))
rebar_size = lmem_size;
else
return;
}
/* Find out if root bus contains 64bit memory addressing */
while (root->parent)
root = root->parent;
pci_bus_for_each_resource(root, root_res, i) {
if (root_res && root_res->flags & (IORESOURCE_MEM | IORESOURCE_MEM_64) &&
root_res->start > 0x100000000ull)
break;
}
/* pci_resize_resource will fail anyways */
if (!root_res) {
drm_info(&i915->drm, "Can't resize LMEM BAR - platform support is missing\n");
return;
}
/*
* Releasing forcewake during BAR resizing results in later forcewake
* ack timeouts and former can happen any time - it is asynchronous.
* Grabbing all forcewakes prevents it.
*/
with_intel_runtime_pm(i915->uncore.rpm, wakeref) {
intel_uncore_forcewake_get(&i915->uncore, FORCEWAKE_ALL);
/* First disable PCI memory decoding references */
pci_read_config_dword(pdev, PCI_COMMAND, &pci_cmd);
pci_write_config_dword(pdev, PCI_COMMAND,
pci_cmd & ~PCI_COMMAND_MEMORY);
_resize_bar(i915, GEN12_LMEM_BAR, rebar_size);
pci_assign_unassigned_bus_resources(pdev->bus);
pci_write_config_dword(pdev, PCI_COMMAND, pci_cmd);
intel_uncore_forcewake_put(&i915->uncore, FORCEWAKE_ALL);
}
}
#else
static void i915_resize_lmem_bar(struct drm_i915_private *i915, resource_size_t lmem_size) {}
#endif
static int
region_lmem_release(struct intel_memory_region *mem)
{
int ret;
ret = intel_region_ttm_fini(mem);
io_mapping_fini(&mem->iomap);
return ret;
}
static int
region_lmem_init(struct intel_memory_region *mem)
{
int ret;
if (!io_mapping_init_wc(&mem->iomap,
mem->io.start,
resource_size(&mem->io)))
return -EIO;
ret = intel_region_ttm_init(mem);
if (ret)
goto out_no_buddy;
return 0;
out_no_buddy:
io_mapping_fini(&mem->iomap);
return ret;
}
static const struct intel_memory_region_ops intel_region_lmem_ops = {
.init = region_lmem_init,
.release = region_lmem_release,
.init_object = __i915_gem_ttm_object_init,
};
static bool get_legacy_lowmem_region(struct intel_uncore *uncore,
u64 *start, u32 *size)
{
if (!IS_DG1(uncore->i915))
return false;
*start = 0;
*size = SZ_1M;
drm_dbg(&uncore->i915->drm, "LMEM: reserved legacy low-memory [0x%llx-0x%llx]\n",
*start, *start + *size);
return true;
}
static int reserve_lowmem_region(struct intel_uncore *uncore,
struct intel_memory_region *mem)
{
u64 reserve_start;
u32 reserve_size;
int ret;
if (!get_legacy_lowmem_region(uncore, &reserve_start, &reserve_size))
return 0;
ret = intel_memory_region_reserve(mem, reserve_start, reserve_size);
if (ret)
drm_err(&uncore->i915->drm, "LMEM: reserving low memory region failed\n");
return ret;
}
static struct intel_memory_region *setup_lmem(struct intel_gt *gt)
{
struct drm_i915_private *i915 = gt->i915;
struct intel_uncore *uncore = gt->uncore;
struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
struct intel_memory_region *mem;
resource_size_t min_page_size;
resource_size_t io_start;
resource_size_t io_size;
resource_size_t lmem_size;
int err;
if (!IS_DGFX(i915))
return ERR_PTR(-ENODEV);
if (!i915_pci_resource_valid(pdev, GEN12_LMEM_BAR))
return ERR_PTR(-ENXIO);
if (HAS_FLAT_CCS(i915)) {
resource_size_t lmem_range;
u64 tile_stolen, flat_ccs_base;
lmem_range = intel_gt_mcr_read_any(to_gt(i915), XEHP_TILE0_ADDR_RANGE) & 0xFFFF;
lmem_size = lmem_range >> XEHP_TILE_LMEM_RANGE_SHIFT;
lmem_size *= SZ_1G;
flat_ccs_base = intel_gt_mcr_read_any(gt, XEHP_FLAT_CCS_BASE_ADDR);
flat_ccs_base = (flat_ccs_base >> XEHP_CCS_BASE_SHIFT) * SZ_64K;
if (GEM_WARN_ON(lmem_size < flat_ccs_base))
return ERR_PTR(-EIO);
tile_stolen = lmem_size - flat_ccs_base;
/* If the FLAT_CCS_BASE_ADDR register is not populated, flag an error */
if (tile_stolen == lmem_size)
drm_err(&i915->drm,
"CCS_BASE_ADDR register did not have expected value\n");
lmem_size -= tile_stolen;
} else {
/* Stolen starts from GSMBASE without CCS */
lmem_size = intel_uncore_read64(&i915->uncore, GEN6_GSMBASE);
}
i915_resize_lmem_bar(i915, lmem_size);
if (i915->params.lmem_size > 0) {
lmem_size = min_t(resource_size_t, lmem_size,
mul_u32_u32(i915->params.lmem_size, SZ_1M));
}
io_start = pci_resource_start(pdev, GEN12_LMEM_BAR);
io_size = min(pci_resource_len(pdev, GEN12_LMEM_BAR), lmem_size);
if (!io_size)
return ERR_PTR(-EIO);
min_page_size = HAS_64K_PAGES(i915) ? I915_GTT_PAGE_SIZE_64K :
I915_GTT_PAGE_SIZE_4K;
mem = intel_memory_region_create(i915,
0,
lmem_size,
min_page_size,
io_start,
io_size,
INTEL_MEMORY_LOCAL,
0,
&intel_region_lmem_ops);
if (IS_ERR(mem))
return mem;
err = reserve_lowmem_region(uncore, mem);
if (err)
goto err_region_put;
if (io_size < lmem_size)
drm_info(&i915->drm, "Using a reduced BAR size of %lluMiB. Consider enabling 'Resizable BAR' or similar, if available in the BIOS.\n",
(u64)io_size >> 20);
return mem;
err_region_put:
intel_memory_region_destroy(mem);
return ERR_PTR(err);
}
struct intel_memory_region *intel_gt_setup_lmem(struct intel_gt *gt)
{
return setup_lmem(gt);
}
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